WO2007145035A1

WO2007145035A1 - Mobile communication system and mobile terminal

Info

Publication number: WO2007145035A1
Application number: PCT/JP2007/059230
Authority: WO
Inventors: Miho Maeda; Mitsuru Mochizuki; Yasushi Iwane; Tetsuya Mishuku; Masaaki Kusano; Ryoichi Fujie; Shigenori Tani; Keiko Tada; Noriyuki Fukui; Michiaki Takano
Original assignee: Mitsubishi Electric Corporation
Priority date: 2006-06-16
Filing date: 2007-04-27
Publication date: 2007-12-21

Abstract

A mobile terminal (3) judges if it can move during a DTX period in an active mode or not. If it can, a message to the effect that it can is sent to a base station (2). When the base station (2) receives the message from the mobile terminal (3) and if the base station (2) judges that it can move during a DRX period in the active mode, the power supply to a data transmitting section and a data receiving section of the mobile terminal (3) is temporarily stopped.

Description

Specification

Mobile communication system and mobile terminal

Technical field

[0001] In the present invention, a base station scheduler controls the transmission rate, transmission power (transmission permission power, transmission permission maximum power), transmission timing, frequency of use, etc. of a plurality of mobile terminals. The present invention relates to a mobile communication system that performs wireless communication with other mobile terminals, and a mobile terminal that constitutes the mobile communication system.

Background art

In recent mobile communication systems, the main data communication system is changing from a circuit switching system to a packet communication system.

Packet communication systems are generally based on constant connection, but mobile terminals of mobile communication systems have limited battery capacity.

Therefore, in a mobile communication system, when a packet communication method (always connected) is adopted, it is necessary to realize low power consumption of the mobile terminal.

[0003] There is 3GPP (3 ^rf Generation Partnership Project) as a standardization body for mobile communication systems.

Currently, in 3GPP, UTRAN system (Release 7) and Evolved RAN system (E— UTRAN, LTE: Long Term) are the next versions of mobile communication systems.

Evolution) is under discussion, and on the spot, discussions are underway to reduce power consumption in packet communication systems.

In that discussion, mobile terminals that use packet communication systems may not be able to send and receive data even when the wireless section is connected, so the mobile terminal must support low power consumption and low power consumption. It has been decided to establish a new supported operation.

[0004] In the LTE system, the state 1 “Idle” inactive at the RRC level and the state 2 rActive (broad) in the active state are defined! However, the following non-patent document 1 As shown in Figure 13, the new state 2—A “Active (narrowly defined)” is added to “Active (broadly defined)”. State 2—B “Active DRXZDTX operation period” is disclosed to be introduced. In addition, in Non-Patent Document 2 below, in order to realize low power consumption of mobile terminals, it is not possible to provide a DRXZDTX period (DRXZDTX period) in RRC-Connected (corresponding to state 2 in FIG. 13). Described to be possible! RU

[0005] State 1 in FIG. 13 is referred to as “Idle”, “LTE—Idle”, “RRC—Idle”, “NAS—Idle”, etc. The mobile terminal in state 1 in FIG. The receiving operation is performed in the DRX cycle set by (Non-Access Stratum) (the DRXZDTX operating period during Active (period different from the DRX cycle in state 2-B in Fig. 13)). That is, a paging operation is performed.

State 2 in FIG. 13 is referred to as “Active”, “LTE—Active”, “RRC—Active”, “RRC—Connected”, “Connected”, “NAS—Active”, or the like.

[0006] State 2-A in FIG. 13 is referred to as "Active", "MAC-ActiveJ", or the like.

State 2—B in Figure 13 is called “Dormant”, “MAC—Dormant”, “DRXZDTX period (D RX / DTX period)”, “DRXZDTX period during Active”, “DRX ZDTX period during Connected”, etc. Therefore, an operation for realizing low power consumption in an active mobile terminal is performed (for example, data (user data and control data) is temporarily stopped to be transmitted or received).

[0007] Non-Patent Document 3 below describes the period during which the DRX operation is performed and the period during which the DTX operation is performed in the active DRXZDTX operation period (state 2-B in FIG. 13). A technique signaled by Medium Access Control) is disclosed.

In Patent Document 1 below, a power different from the DTX cycle in the active DRXZDTX operation period (state 2—B in FIG. 13), the cycle of the CQI (Channel Quality Indicator) transmitted from the mobile terminal to the base station is reduced. A technology for switching between high-speed and low-speed depending on the presence or absence of data transmission is disclosed. Thereby, the effective utilization of the uplink radio resource is achieved.

[0008] The following Non-Patent Document 4 discloses a technique in which a mobile terminal confirms whether or not data addressed to itself exists in a DRX cycle during Active (state 2 in FIG. 13) using a downlink scheduling channel. Has been.

Non-Patent Document 6 below describes a DRX period notification method. The DRX period notification method will be described with reference to FIG.

The control data (for example, L1 ZL2 control signal, etc.) attached to the initial transmission data (user data) from the base station includes a DRX period.

If the mobile terminal fails to receive the initial transmission data transmitted from the base station, it transmits a NAR signal (negative acknowledgment signal) of HAR Q to the base station.

When receiving the Nack signal transmitted from the mobile terminal, the base station performs retransmission. The DRX period is not included in the control data accompanying this retransmission.

When the mobile terminal successfully receives the retransmission data transmitted from the base station, it transmits a HARQ Ack signal (acknowledgment signal) to the base station and starts timer A.

When the base station receives the Ack signal transmitted from the mobile terminal, it starts timer A.

After timer A expires, the mobile terminal and base station start DRX operation.

[0009] Non-Patent Document 8 below discloses a DRX operation in a case where two DRX cycles are set.

Non-Patent Document 5 below has a different meaning from Non-Patent Documents 1 to 4 and Patent Document 1 described above. Whether or not to execute a low power consumption operation based on mobile terminal capability information (UE Capabilities) indicating the capability of the mobile terminal Techniques for determining whether or not are disclosed.

[0010] In addition, the control signal used to enable communication between the mobile terminal and the base station via the radio link includes an upper layer such as “L3 control signaling” (Layer3 control signaling, L3 message). There are signals and signals called “L1ZL2 control signals”.

The L3 control signal is mainly a control signal notified from an upper layer carrier such as an RRC layer at the time of initial transmission including the time of call connection (RRC Connect) occurrence, and is uplinked via the downlink. Downlink channel setting and radio resource allocation.

On the other hand, the L1ZL2 control signal is a control signal that is frequently exchanged between the mobile terminal and the base station in both uplink and downlink. In the uplink, the mobile terminal allocates radio resources to the base station. Uplink scheduling request signal requesting call or call connection The L1ZL2 control signal is also used when the radio resource is changed irregularly according to the data size change or communication path quality requirements, including when it occurs and when it continues.

In the L1ZL2 control signal, when the base station or mobile terminal receives data on the uplink or downlink, the Ack signal ZNack signal that responds to the other party whether or not the data has been received, and the received data Quality information CQI (Channel Quality Indicator) indicating the quality of the communication channel or the quality of the communication channel is also included.

[0011] In Non-Patent Document 7 below, an uplink reference signal (Reference Signal) includes a reference signal used for Demodulation and synchronous detection, and a reference signal used for quality measurement of the uplink channel ( It is shown that there are two types of signals, Sounding Reference Signal)!

Here, Sounding Reference Signal (Sounding RS) is a signal transmitted from the mobile terminal (UE) to the base station (eNB) in order for the base station to measure uplink communication quality.

[0012] Non-Patent Document 9 below describes time-division multiplexing (Time Division Multiplexing) as a data transmission method other than E-MBMS (Evolved Multimedia Broadcast Multicast Service) and E-MBMS (non-MBMS, non-EMBMS). It is disclosed that only Division Multiplexing (TDM) is used. The unit of time division is the subframe unit.

E-MBMS is a multicast 'broadcast multimedia service. Large-capacity broadcast content such as news, weather forecasts, and mopile broadcasts are sent to multiple mobile terminals.

[0013] The base station maps the E—MBMS data to DL—SCH (Downlink Shared Channel) and MCH (Multicast Channel) and transmits them to the mobile terminal.

Moreover, LTE provides not only broadcast communication services (non-MBMS) but also communication services for individual mobile terminals among a plurality of mobile terminals. Communication services for individual mobile terminals are called Unicast services.

Non-Patent Document 10 below shows that only the first symbol in the subframe allocated to E-MBMS by time-division multiplexing or only the first two symbols are unicast service. It is disclosed that it is used in!

[0014] However, Non-Patent Documents 1 to 3 and Patent Document 1 describe that in order to effectively realize low power consumption of a mobile terminal in the active DRXZDTX operation period (state 2-B in FIG. 13). The specific method should be disclosed.

That is, in Non-Patent Documents 1 and 2, it is disclosed that a state for supporting low power consumption of a mobile terminal (state 2-B in FIG. 13) is disclosed.

In the XZDTX operation period (state 2-B in Fig. 13), a method for efficiently realizing low power consumption of a mobile terminal has been disclosed.

[0015] Further, as described above, Non-Patent Document 3 describes that the DRXZDTX operation period during Active (FIG. 1).

In state 2—B), the period during which the DRX operation is performed and the period during which the DTX operation is performed. Power The technology signaled by the base station MAC is disclosed. The power consumption of the mobile terminal is efficiently realized. The method of setting the DRXZDTX cycle to do this is not disclosed.

Further, the DRX period notification method of Non-Patent Document 6 is different from the DRX period notification method disclosed in the present invention.

Furthermore, in the method of Non-Patent Document 6, every time the base station receives a Nack signal from the mobile terminal (“time (i)”, “time (ii)”, “time (iii)” shown in FIG. 14), the DRX operation is performed. There is a problem that scheduling for determining the start timing (D RX period end timing) must be performed, which increases the scheduling load. Therefore, it does not solve the problem of notifying the DRX period while reducing the scheduling load of the base station in the present invention, and there is no suggestion about this problem.

[0016] In addition, in the DRX operation disclosed in Non-Patent Document 8 when the two DRX cycles are set !, when HARQ is applied! Yeah! ,. Therefore, as in the conventional method, it is notified by the L1ZL2 control signal together with the initial transmission data of the DRX periodic information, notified at the time of radio bearer setup, or determined in advance. If the DRX cycle is exceeded, there will be a problem that the DRX operation cannot be entered.

[0017] Non-Patent Documents 9 and 10 describe nothing about DRX operation (DRX operation during Active). Not.

It is disclosed what information is notified in the symbol that can be used for Unicast service in the subframe allocated to E MBMS! /.

[0018] Also, Patent Document 1 discloses a technique for switching the high-speed Z-low speed according to the presence or absence of downlink data transmission in the CQI cycle transmitted from the mobile terminal to the base station. The signaling between the mobile terminal and the base station is not disclosed. Note that the technique disclosed in Patent Document 1 is a technique before introducing a low power consumption operation in a mobile terminal in Active (state 2 in FIG. 13).

[0019] Next, as described above, Non-Patent Document 4 describes whether or not a mobile terminal has the power to send data addressed to itself in the DRX cycle during Active (state 2 in FIG. 13) by the downlink scheduling channel. A technique for checking is disclosed. In other words, there is a period in which the mobile terminal in the active DRXZDTX operation period (state 2-B in Fig. 13) cannot receive downlink data as much as the base station.

Therefore, even if the base station wishes to transmit downlink data to the mobile terminal in the active DRXZDTX operation period (state 2-B in FIG. 13), it transmits data if it is not after a preset period. I can't do that.

For this reason, the throughput of the corresponding mobile terminal is lowered, and in the case where the throughput is prioritized over the realization of low power consumption, it cannot be realized.

[0020] The following Non-Patent Document 5 states whether or not to execute an operation with low power consumption based on mobile terminal capability information (UE Capabilities) so that it can be applied even when priority is given to throughput. A technique for judging the above is disclosed.

However, in the current technology, mobile terminal capability information (UE Capabilities) is a unique value for each mobile terminal.

The mobile terminal capability information (UE Capabilities) is notified from the mobile terminal to the network side at the time of RRC (Radio Resource Control) connection (at the time of attachment, transmission, location registration, etc.).

Therefore, in the current technology, a parameter indicating whether to prioritize the realization of low power consumption or the improvement of throughput is specific to each mobile terminal, and the notificationable timing is also provided. Therefore, it is difficult to effectively realize low power consumption during the DRXZDTX operation period (state 2-B in Fig. 13) during Active.

[0021] Non-Patent Document 1: 3GPP standard document TR25. 913 V7. 2. 0

Non-Patent Document 2: 3GPP standard TR25. 813 VO. 9.0

Non-Patent Document 3: 3GPP contribution R2—060888

Non-Patent Document 4: 3GPP contribution R2-060591

Non-Patent Document 5: 3GPP contribution R2-060846

Non-Patent Document 6: 3GPP contribution R2— 070279

Non-Patent Document 7: 3GPP standard document TR25.814 V7. 0. 0

Non-Patent Document 8: 3GPP contribution R2— 070265

Non-Patent Document 9: 3GPP Contribution R1— 071245

Non-Patent Document 10: 3GPP contribution R2— 070701

Patent Document 1: Japanese Patent Laid-Open No. 2003-204298

[0022] The conventional mobile communication system is configured as described above! Therefore, in state 2 “Active (broad)” active at the RRC level, state 2-B “Active DRXZDTX operation period ”can be introduced. However, the method of efficiently realizing low power consumption of mobile terminals and the DRXZDTX cycle setting method are not stipulated, and there are problems such as that it is not always possible to efficiently realize low power consumption of mobile terminals. there were.

[0023] The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mobile communication system and a mobile terminal that can efficiently realize low power consumption of the mobile terminal. And

Disclosure of the invention

[0024] The mobile communication system according to the present invention determines whether or not the mobile terminal is capable of shifting to a temporary transmission stop period of data, and shifts to a temporary transmission stop period. If it is determined by the base station that the mobile terminal can shift to a temporary data reception suspension period, the power to the data transmission processing unit and the reception processing unit of the mobile terminal is determined. Supply is temporarily stopped.

[0025] This makes it possible to efficiently realize low power consumption of the mobile terminal. There is an effect.

Brief Description of Drawings

1] A configuration diagram showing a mobile communication system according to a first embodiment of the present invention.圆 2] A configuration diagram showing a mobile terminal of the mobile communication system according to the first embodiment of the present invention.

圆 3] is a configuration diagram showing a base station of a mobile communication system according to Embodiment 1 of the present invention.

FIG. 4 is a sequence diagram showing processing contents of the mobile communication system according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing the processing content of step ST5 in the protocol processing unit 33.

FIG. 6 is a sequence diagram showing processing contents of the mobile communication system according to the second embodiment of the present invention.

[7] It is an explanatory view showing an example of determining the DRX cycle and the DTX cycle.

FIG. 8 is a sequence diagram showing processing contents of the mobile communication system according to the third embodiment of the present invention.

FIG. 9 is an explanatory diagram showing an example of physical channel mapping.

FIG. 10 is a sequence diagram showing processing contents of the mobile communication system according to the fifth embodiment of the present invention.

FIG. 11 is a sequence diagram showing processing contents of the mobile communication system according to the fifth embodiment of the present invention.

[12] It is an explanatory view showing an example of an indicator.

13] An explanatory diagram showing state transition of the mobile communication system.

FIG. 14 is an explanatory diagram of a method in which the base station shown in Non-Patent Document 6 notifies the mobile terminal of the DRX period.

[15] An explanatory diagram of terms used in the present invention.

FIG. 16 is a sequence diagram showing processing contents of the mobile communication system according to the first embodiment of the present invention. [17] It is an explanatory view showing an example of determining a DRX cycle and a DTX cycle.

FIG. 18 is a sequence diagram showing processing contents of the mobile communication system according to the second embodiment of the present invention.

[19] FIG. 19 is an explanatory diagram showing an example of a method of notifying the mobile station of the DRX cycle of the base station power.

[21] FIG. 21 is an explanatory diagram showing an example of a method of notifying the mobile terminal from the base station manager when the DTX cycle and the DRX cycle are set equal to each other.

FIG. 22 is an explanatory diagram showing a timing example when a DRX cycle corresponding to a plurality of radio bearers is set in parallel in the downlink.

[23] FIG. 23 is an explanatory diagram showing an example of a method for notifying the mobile terminal of the DTX cycle when the base station power exists when there is uplink data.

FIG. 24 is an explanatory diagram showing an example of a case where a sounding signal is used as an uplink transmission signal when there is no uplink data.

[Fig. 25] Reception timing power of received signal is an explanatory diagram showing time parameters until transmission timing after DTX operation.

[Fig.26] Method of notifying base station and mobile terminal of DRX cycle and DTX cycle when there is data transmission in both downlink and uplink, and DRX cycle and DTX cycle are the same. It is explanatory drawing which shows an example.

FIG. 27 is a sequence diagram showing a DRX control flow of the mobile communication system according to the eighth embodiment of the present invention.

FIG. 28 is a sequence diagram showing a flow of DTX control in the mobile communication system according to the eighth embodiment of the present invention.

FIG. 29 is a flowchart showing a processing flow of a DRXZDTX cycle setting method in DTX control and DRX control of a mobile communication system according to Embodiment 8 of the present invention.

FIG. 30 is an explanatory diagram showing an example of actual operation of DRX control in downlink data transmission in the HARQ mode according to the eighth embodiment of the present invention.

[FIG. 31] DT in uplink data transmission in HARQ mode according to Embodiment 8 of the present invention. It is explanatory drawing which shows the actual operation example of X control.

FIG. 32 is an explanatory diagram showing an actual operation example of DTX control when two types of data and control signals having different DTX periods are generated in uplink data transmission in the HARQ mode according to Embodiment 8 of the present invention. It is.

FIG. 33 shows an actual operation example of D RX control when new data of a different DRX cycle is generated during sleep in the D RX period in downlink data transmission in the HARQ mode according to the eighth embodiment of the present invention. It is explanatory drawing.

[34] FIG. 34 is an explanatory diagram showing a case where two DRX cycles shown in Non-Patent Document 8 are set.

[FIG. 35] When two DRX periods are set, the method disclosed in Embodiment 7 is applied to the setting of DRX period [2], and the setting of DRX period [1] is FIG. 16 is an explanatory diagram to which the method disclosed in the eighth embodiment is applied.

[FIG. 36] The relationship between the time required according to the maximum (MAX) number of retransmissions of HARQ and the size of the DRX cycle indicates the relationship between the mobile terminal and base station in the method combining the method disclosed in Embodiment 7 and the conventional method. It is a sequence diagram.

FIG. 37 is an explanatory diagram showing an example when the timing of transmitting an uplink Ack signal ZNack signal and the CQI transmission timing overlap.

FIG. 38 is an explanatory diagram showing an example when the timing of transmitting an uplink Ack signal ZNack signal overlaps with the CQI transmission timing.

FIG. 39 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the twelfth embodiment of the present invention.

FIG. 40 is a sequence diagram showing an example of processing contents of a mobile terminal and a base station according to Embodiment 12 of the present invention.

FIG. 41 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the first modification of the twelfth embodiment of the present invention.

FIG. 42 is a sequence diagram showing an example of processing contents of a mobile terminal and a base station according to Modification 1 of Embodiment 12 of the present invention.

FIG. 43 shows a DR in the mobile communication system according to the second modification of the twelfth embodiment of the present invention. It is explanatory drawing which shows an example of the X operation | movement method.

FIG. 44 is a sequence diagram showing an example of processing contents of a mobile terminal and a base station according to Modification 2 of Embodiment 12 of the present invention.

FIG. 45 is an explanatory diagram showing an example of a DRX operation method in a mobile communication system according to Modification 3 of Embodiment 12 of the present invention.

FIG. 46 is an explanatory diagram showing an example of a relationship between QoS of a service and an initial DRX cycle.

FIG. 47 is an explanatory diagram showing an example of allocation of radio resources other than E-MBMS and E-MBMS.

FIG. 48 is an explanatory diagram showing an example of radio resource allocation in a subframe allocated to E-MBMS.

FIG. 49 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system for illustrating the problem of the thirteenth embodiment of the present invention.

FIG. 50 is an explanatory diagram showing an example of an E-MBMS operation and a DRX operation method in the mobile communication system according to the thirteenth embodiment of the present invention.

FIG. 51 is a sequence diagram showing an example of processing contents of a mobile terminal and a base station according to Embodiment 13 of the present invention.

FIG. 52 is a sequence diagram showing an example of processing contents of a mobile terminal and a base station according to Modification 1 of Embodiment 13 of the present invention.

FIG. 53 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system for illustrating the problem of the fourteenth embodiment of the present invention.

FIG. 54 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the fourteenth embodiment of the present invention.

FIG. 55 is a sequence diagram showing an example of processing contents of a mobile terminal and a base station according to Embodiment 14 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, in order to explain the present invention in more detail, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

Hereinafter, the LTE system will be described. However, the uplink and downlink schedulers In a mobile communication system (for example, a UTRAN system) that controls and directs the transmission rate, transmission power (transmission permission power, transmission permission maximum power), transmission timing, usage frequency, usage frequency width, etc. to the terminal, the present invention Applicable.

Embodiment 1.

FIG. 1 is a block diagram showing a mobile communication system according to Embodiment 1 of the present invention. The mobile communication system in FIG. 1 is an LTE system, and the uplink scheduler and downlink scheduler of the base station are the transmission rate, transmission power (transmission permitted power, maximum transmission permitted power), transmission timing, and frequency used by multiple mobile terminals. It controls the frequency range of use.

Further, in the mobile communication system of FIG. 1, transport channels in which a mobile terminal and a base station communicate will be described. However, since the transport channel is under discussion, the name and definition may be changed in the future, but it goes without saying that the present invention is applicable even when the name and definition are changed. . In the present invention, state 2-B in FIG. 13 is referred to as an “active DRXZDTX operation period”, but both the active DRX operation period and the active DTX operation period overlap! / This is described as the DRXZDTX operation period (state 2-B in Fig. 13).

The DRX operation period during Active is described as a period in which a reception operation for a certain period of time and an operation that does not perform reception for a certain period of time are repeated in the Active DRX cycle (see Figure 15). There is also an active DRX operation period in which the DRX cycle repeats once.

The period during which the DRX operation is active and no reception is performed will be described as a DRX period and a DRX interval (see FIG. 15).

In addition, during the DRX operation period, the part excluding the DRX period is described as Active during the DRX operation period (see Figure 15).

The following (1) to (8) reception operations can be considered as examples of the reception operation performed by the mobile terminal 3 in Active during the DRX period in the DRX cycle.

(1) Data reception operation in which the mobile terminal 3 confirms by the downlink scheduling channel whether or not the data addressed to itself exists. (2) Downlink L1ZL2 control signal monitoring operation

(3) Measurement operation (peripheral cell measurement, own cell measurement, etc.)

(4) User data (Traffic data) reception operation

(5) Reception timing information (Timing information, Timing Advance (TA)) reception operation

(7) HARQ compatible Ack signal ZNack signal reception operation for upstream data

(8) Combination operation of (1) to (7) above

However, the combined operation of (1) to (7) in (8) may be continuous or discontinuous in time.

[0029] Hereinafter, HARQ (Hybrid Automatic Repeat Request) will be described.

The case where HARQ is applied to the transmission data from the base station to the mobile terminal is explained.

When the mobile terminal receives data from the base station, it performs error detection processing on the data. As a response signal to the base station, the mobile terminal transmits an Ack signal when an error is not detected by the error detection process, and transmits a Nack signal when an error is detected by the error detection process.

When the base station receives an Ack signal from the mobile terminal, it transmits new data to the mobile terminal, but when it receives a Nack signal from the mobile terminal, it retransmits the same data to the mobile terminal. Become.

HARQ can be applied to the transmission data from the mobile terminal to the base station as described above.

[0030] The DTX operation period during Active is described as a period in which a transmission operation for a certain period of time and an operation in which transmission for a certain period of time is not performed are repeated in the DTX cycle during the Active period (see Fig. 15). . There is also an active DTX operation period in which the DTX cycle repeats once. The period during which DTX is active and no transmission is performed is described as a DTX period (DTX Period) and a DTX interval (DTX Interval) (see Fig. 15). Also, during the DTX operation period, except for the DTX period, the DTX operation period This is described as Active during the process (see Figure 15).

[0031] The following transmission operations (1) to (9) are conceivable as an example of the transmission operation that the mobile terminal 3 performs in Active during the DTX operation period in the DTX cycle.

(1) Transmission operation of information (for example, CQI) used for downlink scheduling

(2) Reference signal transmission operation used for demodulation and detection

(3) Transmission operation of reference signal (Sounding Reference Signal) for quality measurement of uplink channel

(4) Up scheduling request transmission operation

(5) User data (Traffic data) transmission operation

(6) Transmission operation for performing uplink timing measurement by the base station (for example, transmission of Sounding Reference Signal, CQI, RACH, etc. can be considered).

(7) HARQ-compatible Ack signal ZNack signal transmission operation for downstream data

(8) L1ZL2 control signal transmission operation

(9) Combination operation of (1) to (8) above

However, the combined operations (1) to (8) in (9) may be continuous or discontinuous in time.

[0032] The present invention is applicable even when the definition of the words described above is changed.

For example, as a transmission operation performed by the mobile terminal 3 in the DTX cycle, (3) when a reference signal (Sounding Reference Signal) for uplink channel quality measurement is transmitted, or (6) by the base station As a transmission operation for uplink timing measurement, when a Sounding Reference Signal is transmitted, the DTX cycle may be called a Sounding Reference Signaru transmission cycle. Even in that case, the present invention is applicable.

Also, for example, as a transmission operation performed by the mobile terminal 3 in the DTX cycle, (1) when information used for downlink scheduling (for example, CQI) is transmitted, or (6) by the base station CQI is transmitted as a transmission operation for uplink timing measurement. In this case, the DTX period may be called CQI transmission period. Even in that case, the present invention is applicable.

[0033] In addition, the DRX operation period during Active, the DTX operation period during Active, and! / Are the periods during which the DRX operation period or DTX operation period during Active are implemented as shown in FIG. Applicable as State 2—B.

In the future discussion, the number of states and the definition of each state may be changed, but the present invention is applicable even when the number of states and the definition of each state are changed. Needless to say.

In FIG. 1, a base station control device 1 has a plurality of base stations 2 under its control, and transmits / receives control data and user data to / from a plurality of base stations 2 under its control. The base station controller 1 is referred to as a GW or RNC.

The base station 2 has a plurality of mobile terminals 3 under its umbrella and performs wireless communication with a plurality of mobile terminals 3 under its control. That is, the base station 2 has uplink and downlink schedulers, which enable the scheduler to transmit and receive data between the base station 2 and the mobile terminal 3, and thus the throughput of the individual mobile terminals 3 and the entire mobile communication system. Scheduled for improvement. Scheduling refers to the uplink and downlink schedulers controlling and instructing each mobile terminal on transmission rate, transmission power (transmission permission power, transmission permission maximum power), transmission timing, frequency used, width of frequency used, and the like.

Also, retransmission control of data (control data, user data) using HARQ (Hybrid Automatic Repeat Request) is performed. The base station 2 is referred to as NodeB, E-UTR AN NodeB (E—NodeB, eNB), or the like.

The mobile terminal 3 performs wireless communication with the base station 2. The mobile terminal 3 is called a mobile station, UE (User Equipment), MS (Mobile Station), or the like.

Here, a transport channel in which the base station 2 and the mobile terminal 3 communicate will be described.

BCH (Broadcast Channel) is a channel through which the base station 2 transmits broadcast information to the mobile terminal 3 being served by the base station 2.

DL-SCH (Downlink Shared Channel) is a shared channel (Shared Channel) in which the base station 2 transmits control data and user data to the mobile terminal 3 being served thereby. [0036] The PCH (Paging Channel) is based on the DRX cycle of the mobile terminal 3 in which the base station 2 is set by the network (the DRXZDTX operation period during active (period different from the DRX cycle in state 2-B in Fig. 13)) This channel supports discontinuous reception (intermittent reception) of mobile terminal 3.

UL-SCH (Uplink Shared Channel) is a shared channel through which the mobile terminal 3 transmits control data and user data to the base station 2.

RACH (Random Access Channel) is a channel that is randomly transmitted from the mobile terminal 3 to the base station 2.

It is considered that a plurality of base stations 2 communicate data with each other.

FIG. 2 is a configuration diagram showing a mobile terminal of the mobile communication system according to Embodiment 1 of the present invention.

The protocol processing unit 11 outputs control data addressed to the base station 2 or the base station control device 1 to the transmission data buffer unit 13, collects control data transmitted from the base station 2, and performs protocol processing using the control data. And so on.

The application unit 12 outputs user data to the transmission data buffer unit 13 and collects user data transmitted from the base station 2 and performs a process of converting the user data into a form for the user to use.

The transmission data buffer unit 13 temporarily stores the control data output from the protocol processing unit 11 and the user data output from the application unit 12 and is generated by the sleep request signal generation unit 20. For example, a memory that temporarily stores Sleep request signals as control data.

The encoder unit ₁₄ is stored in the transmission data buffer unit 13 and performs encoding processing such as error correction processing on the control data and user data.

The encoder unit 14 may output the control data and user data to the modulation unit 15 without performing the encoding process on the control data and user data stored in the transmission data buffer unit 13. .

[0039] The modulation unit 15 modulates the control data and user data output from the encoder unit 14. Then, a process of outputting the control data and user data after modulation to the antenna 16 is performed.

The antenna 16 transmits the data modulated by the modulation unit 15 to the base station 2 as a radio signal, receives the radio signal transmitted from the base station 2, and outputs the radio signal to the demodulation unit 17.

The demodulator 17 performs a demodulation process on the radio signal output from the antenna 16, and performs a process of outputting the demodulated control data and user data to the decoder unit 18. The decoder unit 18 is generated by the demodulator 17. Performs decoding processing such as error correction on the demodulated control data and user data, and outputs the decoded control data to the protocol processing unit 11, DTX cycle storage unit 21 and DRX cycle storage unit 22 for decoding Performs processing to output data to application section 12.

[0041] That is, the decoder unit 18 indicates whether or not it is possible to shift to the active DRX operation period, which is a temporary data reception stop period, of the decoded control data. 2 is output to the protocol processing unit 11, and DTX cycle information (supply stop cycle information) indicating the DTX cycle set by the base station 2 is output to the DTX cycle storage unit 21 and set by the base station 2. DRX cycle information (supply stop cycle information) indicating the DRX cycle is output to the DRX cycle storage unit 22.

However, the decoder unit 18 may output the control data and user data to the protocol processing unit 11, the application unit 12, etc. without performing the decoding process on the control data and user data after demodulation by the demodulation unit 17. .

The antenna 16, demodulator 17, decoder 18 and protocol processor 11 constitute a determination result receiving means by the base station 2.

[0042] For example, the DTX determination unit 19 confirms whether or not the data to be transmitted to the base station 2 is stored in the transmission data buffer unit 13, and if the data to be transmitted to the base station 2 is stored, Then, it is determined that it is possible to shift to the active DTX operation period, which is a temporary data transmission suspension period. The DTX determination unit 19 constitutes a shift determination unit. When the determination result of the DTX determination unit 19 indicates that the sleep request signal generation unit 20 can shift to the active DTX operation period, the sleep request signal generation unit 20 generates a sleep request signal under the instruction of the protocol processing unit 11. The sleep request signal is output to the transmission data buffer unit 13 as control data.

The DTX cycle storage unit 21 is a memory or the like that stores DTX cycle information (supply stop cycle information) indicating the DTX cycle set by the base station 2 among the control data decoded by the decoder unit 18.

The DRX cycle storage unit 22 is a memory or the like that stores DRX cycle information (supply stop cycle information) indicating the DRX cycle set by the base station 2 among the control data decoded by the decoder unit 18.

Note that the DTX determination unit 19 may be included in the transmission data buffer unit 13. The DTX determination unit 19, the Sleep request signal generation unit 20, the DTX cycle storage unit 21, and the DRX cycle storage unit 22 may be included in the protocol processing unit 11, respectively.

The control unit 23 controls all the processing units constituting the mobile terminal 3. For example, the control unit 23 indicates that the determination result of the DTX determination unit 19 can shift to the active DTX operation period, and the protocol processing unit 11 shifts to the active DRX operation period. When the determination result of the base station 2 indicating that the transmission is possible is acquired, data transmission is performed according to the DTX cycle information stored in the DTX cycle storage unit 21 and the DRX cycle information stored in the DRX cycle storage unit 22. Processing for temporarily stopping the supply of power to the processing units (for example, the encoder unit 14 and the modulation unit 15) and the reception processing units (for example, the demodulation unit 17 and the decoder unit 18) is performed.

The DTX cycle storage unit 21, the DRX cycle storage unit 22, and the control unit 23 constitute a power supply stop unit.

[0045] Here, the control unit 23 has shown a power supply that temporarily stops the supply of power to the transmission processing unit and the reception processing unit. The protocol processing unit 11 temporarily supplies power to the transmission processing unit and the reception processing unit. Even if you want to stop.

In the first embodiment, a description will be given of a case where the control unit 23 temporarily stops supplying power to the encoder unit 14, the modulation unit 15, the demodulation unit 17, and the decoder unit 18. The target of stopping the supply of power is merely an example, for example, a protocol processing unit 11, an application unit 12, a transmission data buffer unit 13, a DTX determination unit 19, a Sleep request signal generation unit 20, a DTX cycle storage unit 21, The power supply to the DRX cycle storage unit 22 etc. may be temporarily stopped.

FIG. 3 is a block diagram showing a base station of the mobile communication system according to Embodiment 1 of the present invention.

The aGW communication unit 31 performs data transmission / reception with the base station control device 1 and outputs the user data and control data transmitted to the base station control device 1 to the transmission data buffer unit 34.

The other base station communication unit 32 performs data transmission / reception with the other base station 2, and performs processing of outputting user data and control data transmitted from the other base station 2 to the transmission data buffer unit 34.

The protocol processing unit 33 exchanges information with the aGW communication unit 31 and the other base station communication unit 32, and outputs control data addressed to the mobile terminal 3 to the transmission data buffer unit 34 and is transmitted from the mobile terminal 3. Collect control data and implement protocol processing using the control data.

The transmission data buffer unit 34 is a memory for temporarily storing control data output from the protocol processing unit 33 and user data output from the aGW communication unit 31 and the other base station communication unit 32.

The encoder unit 35 performs encoding processing such as error correction processing on the control data and user data stored in the transmission data buffer unit 34.

The encoder unit 35 may output the control data and user data to the modulation unit 36 without performing the encoding process on the control data and user data stored in the transmission data buffer unit 34. .

The modulation unit 36 performs a process of modulating the control data and user data output from the encoder unit 35 and outputting the modulated control data and user data to the antenna 37.

The antenna 37 transmits the data modulated by the modulator 36 to the mobile terminal 3 as a radio signal. At the same time, it receives a radio signal transmitted from the mobile terminal 3 and outputs the radio signal to the demodulator 38.

The demodulator 38 performs a demodulation process on the radio signal output from the antenna 37, and performs a process of outputting the demodulated control data and user data to the decoder unit 39. The decoder unit 39 is provided by the demodulator 38. Performs decoding processing such as error correction on the demodulated control data and user data, and sends the decoded control data to the aGW communication unit 31, other base station communication unit 32, protocol processing unit 33, Sleep request signal determination unit 40, A process of outputting to the downlink scheduler unit 42 and the uplink scheduler unit 43 and outputting the decoded user data to the aGW communication unit 31 and the other base station communication unit 32 is performed.

However, the decoder unit 39 does not perform the decoding process on the control data and user data after demodulation by the demodulation unit 38, and outputs the control data and user data to the protocol processing unit 33, the aGW communication unit 31 and the like. Good.

The sleep request signal determination unit 40 determines whether or not the sleep request signal is included in the control data output from the decoder unit 39, and outputs the determination result to the protocol processing unit 33.

When the determination result of the sleep request signal determination unit 40 indicates that the sleep request signal is included, the protocol processing unit 33 stores, for example, data to be transmitted to the mobile terminal 3 in the transmission data buffer unit 34. If the data to be transmitted to the mobile terminal 3 is not stored, the mobile terminal 3 can move to the DRX operation period during the Active, which is a temporary data reception stop period. It is determined that it is.

Here, the power of the protocol processing unit 33 determining whether or not the mobile terminal 3 can shift to the DRX operation period during which the mobile terminal 3 is active. This determination is based on whether or not the base station 2 can shift to the DTX operation period during which the mobile station 3 is active. Is equivalent to determining

When the protocol processing unit 33 determines that the mobile terminal 3 can shift to the active DRX operation period, the protocol processing unit 33 outputs the determination result to the transmission data buffer unit 34 as control data.

[0051] The QoS storage unit 41 is a service that is transmitted and received between the base station 2 and the mobile terminal 3 being served by the base station 2. For example, memory that stores quality information QoS.

The downlink scheduler unit 42 performs downlink scheduling for the mobile terminal 3 being served by the base station 2 under the instruction of the protocol processing unit 33.

The uplink scheduler unit 43 performs uplink scheduling for the mobile terminal 3 being served by the base station 2 under the instruction of the protocol processing unit 33.

The control unit 44 controls all the processing units constituting the base station 2. FIG. 4 is a sequence diagram showing the processing contents of the mobile communication system according to Embodiment 1 of the present invention.

Next, the operation will be described.

When the state of the mobile terminal 3 is in state 2 “A _C tive (broad sense;)” in FIG. 13, the DTX determination unit 19 of the mobile terminal 3 can switch to the active DTX operation period. Determine whether or not (step ST1).

That is, the DTX determination unit 19 determines whether or not the mobile terminal 3 can perform the DTX operation while being active.

[0053] Here, as an example of the DTX operation, information (for example, CQI) used by the mobile terminal 3 for uplink user data and downlink scheduling and a pilot signal (synchronous detection compensation of uplink data, phase of uplink data) This is an operation (DTX: Discontinuous Transmission) without transmitting a reference signal (signal used for compensation, etc.) and a reference signal (Sounding Reference Signal) for the purpose of measuring the quality of the uplink channel.

Alternatively, the DTX operation may be performed during the following periods (1) to (8) and combinations thereof.

(1) Do not send information used for downlink scheduling (CQI, etc.)

(2) Do not send a pilot signal!

(3) Do not transmit the reference signal (Sounding Reference Sign) for the purpose of measuring the quality of the uplink channel

(4) Do not send uplink scheduling request

(5) Do not transmit uplink user data

(6) Do not transmit for uplink timing measurement by the base station (7) HARQ compatible Ack signal ZNack signal for downstream data

(8) Do not send L1ZL2 control signal

The determination of whether or not the DTX determination unit 19 can perform the DTX operation is performed by, for example, confirming the presence or absence of data in the transmission data buffer unit 13.

Specifically, if there is no data in the transmission data buffer unit 13, it is determined that the DTX operation can be performed, and if there is data, it is determined that the DTX operation cannot be performed.

The DTX determination unit 19 outputs a determination result on whether or not the DTX operation can be performed to the protocol processing unit 11.

[0055] The Sleep request signal generation unit 20 of the mobile terminal 3 shifts to the active DTX operation period when the determination result of the DTX determination unit 19 indicates that the DTX operation can be performed. In the case of indicating that it is possible, a sleep request signal is generated under the instruction of the protocol processing unit 11, and the sleep request signal is output to the transmission data buffer unit 13 as control data.

[0056] Here, the sleep request signal is a signal having all of the following meanings (1) to (5), or a signal having any one of the meanings (1) to (5) or a combination thereof. It is.

(1) This means that mobile terminal 3 starts the active DTX operation period

(2) This means that there is no data to be transmitted in the transmission data buffer section 13 of the mobile terminal 3 or there is no data to be transmitted immediately.

(3) This means that the base station 2 is requested to match the DRX cycle and the DTX cycle in state 2 “Active (broad sense)” in FIG.

(4) This means requesting a transition to the active DRXZDTX period (state 2-B in Figure 13).

(5) This means requesting the start of the DRX operation period during Active

Note that the sleep request signal may be a signal that notifies and propagates to the base station 2 all or a combination of the above meanings (1) to (5) or any meaning of (1) to (5). Good.

[0057] The encoder unit 14 of the mobile terminal 3 stores the control data (Sleep request signal) in the transmission data buffer unit 13 when the Sleep request signal generation unit 20 stores the control data (Sleep request signal) in the transmission data buffer unit 13. Encodes the received control data (Sleep request signal). When the encoder unit 14 performs the encoding process, the modulation unit 15 of the mobile terminal 3 modulates the control data (Sleep request signal) after the encoding process, and sends the modulated control data (Sleep request signal) to the antenna 16. Output.

[0058] The antenna 16 of the mobile terminal 3 transmits the control data (Sleep request signal) modulated by the modulation unit 15 to the base station 2 as a radio signal (step ST2).

Here, the power that the mobile terminal 3 sends control data (Sleep request signal) to the base station 2 as a radio signal is shown. For example, there is a method of mapping to the MAC header.

[0059] When receiving the radio signal transmitted from the mobile terminal 3, the antenna 37 of the base station 2 outputs the radio signal to the demodulation unit 38 (step ST3).

When receiving the radio signal from the antenna 37, the demodulator 38 of the base station 2 performs demodulation processing on the radio signal and outputs the demodulated control data (Sleep request signal) to the decoder unit 39.

The decoder unit 39 of the base station 2 performs a decoding process on the control data (Sleep request signal) after being demodulated by the demodulator 38, and sends the decoded control data (Sleep request signal) to the protocol processor 33 and the Sleep request Output to the signal judgment unit 40.

[0060] When the sleep request signal determination unit 40 of the base station 2 receives the control data from the decoder unit 39, the sleep request signal determination unit 40 determines whether or not the sleep request signal is included in the control data, and determines the determination result. Output to protocol processor 33.

When the protocol processing unit 33 of the base station 2 receives the determination result indicating that the Sleep request signal is included from the Sleep request signal determination unit 40, the protocol processing unit 33 currently determines whether the mobile terminal 3 is currently performing the DRX operation. (Step ST4), and if the mobile terminal 3 is currently performing the DRX operation, the process proceeds to step ST6. Alternatively, in step ST4, it may be determined whether or not the mobile terminal 3 is currently in the DRX operation period. Note that the processing in step ST4 is optional and not required! /.

[0061] The protocol processing unit 33 of the base station 2 is that the mobile terminal 3 is not currently performing the DRX operation. If not, it is determined whether or not the mobile terminal 3 can perform the DRX operation in Active (broad sense) (step ST5). Here, the protocol processing unit 33 performs the determination process, but the downlink scheduler unit 42 or the uplink scheduler unit 43 may perform the determination process. Alternatively, in step ST5, it may be determined whether or not the mobile terminal 3 can move to the DRX operation period.

[0062] The DRX operation in Active (broad sense) means that the mobile terminal 3 does not receive control data and user data for a certain period.

More specifically, when the specified monitor signal is received at the specified DRX cycle, if there is data addressed to you, the receive operation is continued, and if the data addressed to you does not exist Means to stop receiving.

Alternatively, it may be possible to restore the normal reception operation from the active power during the DRX operation period in Active (broad sense) with the specified timer.

Details of the processing content of step ST5 in the protocol processing unit 33 will be described later with reference to the flowchart of FIG.

If it is determined in this step ST5 that the DRX operation cannot be performed, the determination in step ST5 may be repeated at regular intervals using a timer or the like.

[0063] If the protocol processing unit 33 of the base station 2 determines that the mobile terminal 3 can perform the DRX operation in the active (broad sense), the state of the base station 2 is changed to the active DRXZDTX operation period (Fig. Transition to state 2—B) of 13 (step ST6).

When the protocol processing unit 33 determines whether or not the mobile terminal 3 can perform the DRX operation in the Active (broad sense) as described above, that is, during the DRX operation period during the Active. When it is determined whether or not it is possible to shift, the determination result is output to the transmission data buffer unit 34 as control data.

[0064] When the protocol processing unit 33 stores the control data (determination result) in the transmission data buffer unit 34, the encoder unit 35 of the base station 2 controls the control data (determination result) stored in the transmission data buffer unit 34. ) Encoding process is performed.

When the encoder unit 35 performs the encoding process, the modulation unit 36 of the base station 2 modulates the control data (determination result) after the encoding process, and stores the control data (determination result) after the modulation. Output to antenna 37.

[0065] The antenna 37 of the base station 2 receives control data (determination result) after modulation by the modulation unit 36 as a radio signal (determination result signal (information), transition notification signal (information), transition notification signal (information)). Is transmitted to the mobile terminal 3 (step ST7).

Here, the processing shown in step ST7 can be performed at the same time as the processing in step ST6.

V, and may be performed before performing step ST6.

[0066] Also, here, as a method of notifying the force determination result shown for the case where the base station 2 transmits control data (determination result) as a radio signal to the mobile terminal 3, a method of mapping to a physical channel is more common. There is a method of mapping to MAC header etc. as strong MAC signaling.

[0067] In the process of step ST2, a Sleep request is made using a channel (transport channel, physical channel) in which a response signal (ACK signal ZNACK signal) from the base station 2 to the mobile terminal 3 exists. When a signal is transmitted, that is, when a sleep request signal is transmitted from mobile terminal 3 to base station 2 using a channel (transport channel, physical channel) that supports high-speed retransmission control by HARQ, the response The signal (ACK signal ZN ACK signal) and control data (judgment result) may be transmitted together.

In this case, as compared with the case where control data (determination result) is transmitted using another channel (for example, DL—SCH), further downlink scheduling is unnecessary, and there is little delay (Delay). ) Is advantageous in that control data (judgment results) can be notified.

[0068] When receiving the radio signal transmitted from base station 2, antenna 16 of mobile terminal 3 outputs the radio signal to demodulator 17 (step ST8).

When receiving a radio signal from the antenna 16, the demodulator 17 of the mobile terminal 3 performs demodulation processing on the radio signal and outputs control data (determination result) after demodulation to the decoder unit 18.

The decoder unit 18 of the mobile terminal 3 performs a decoding process on the control data (determination result) after demodulation by the demodulation unit 17 and outputs the decoded control data (determination result) to the protocol processing unit 11. [0069] The control unit 23 of the mobile terminal 3 determines whether or not the mobile terminal 3 is capable of changing the state of the mobile terminal 3 to the active DRXZDTX operation period (state 2-B in FIG. 13) (step ST9).

The control unit 23 of the mobile terminal 3 indicates that the determination result of the DTX determination unit 19 can be shifted to the active DTX operation period in the processing of step ST1, and the protocol processing unit 11 is active. When the control data (determination result) of base station 2 indicating that it is possible to shift to the DRX operation period in the middle is acquired, the state of mobile terminal 3 is changed to the active D RXZDTX operation period (state 2— The mobile terminal 3 is transitioned to the active DRXZDTX operation period (state 2-B in Fig. 13) (step ST10).

[0070] When the control unit 23 of the mobile terminal 3 changes the state of the mobile terminal 3 to the active DRXZDTX operation period (state 2-B in FIG. 13), the control unit 23 performs the DRX operation and the DTX operation (step ST11).

) o

That is, the control unit 23 temporarily supplies power to the data transmission processing unit (for example, the encoder unit 14 and the modulation unit 15) according to the cycle indicated by the DTX cycle information stored in the DTX cycle storage unit 21. To stop.

Further, according to the cycle indicated by the DRX cycle information stored in the DRX cycle storage unit 22, the supply of power to the data reception processing unit (for example, the demodulation unit 17 and the decoder unit 18) is temporarily stopped.

Or, according to the DTX cycle information, supply power to the transmission processing unit and the reception processing unit during the period where the period when the power supply can be temporarily stopped and the period when the power supply can be temporarily stopped according to the DRX period information overlap. Although the control unit 23 temporarily stops the supply of power to the encoder unit 14, the modulation unit 15, the demodulation unit 17, and the decoder unit 18 here, The target to stop power supply is only an example.For example, protocol processing unit 11, application unit 12, transmission data buffer unit 13, DTX determination unit 19, Sleep request signal generation unit 20, DTX cycle storage unit 21, DRX cycle The power supply to the storage unit 22 and the like may be temporarily stopped. [0071] Even though the control unit 23 of the mobile terminal 3 indicates that the determination result of the DTX determination unit 19 can shift to the active DTX operation period in the process of step ST1, the protocol 23 When the processing unit 11 obtains control data (determination result) of the base station 2 indicating that it is impossible to shift to the active DRX operation period (or to determine to shift to the active DRX operation period) If the result is not obtained and if the result is strong), the state of the mobile terminal 3 is not changed to the DRXZDTX operation period (state 2-B in FIG. 13) during the active, and only the DTX operation is performed (step ST12).

That is, the control unit 23 does not stop the power supply to the data reception processing unit (for example, the demodulation unit 17 and the decoder unit 18), and the cycle indicated by the DTX cycle information stored in the DTX cycle storage unit 21 Accordingly, the supply of power to the data transmission processing unit (for example, the encoder unit 14 and the modulation unit 15) is temporarily stopped.

Alternatively, since the power supply to the reception processing unit cannot be temporarily stopped, the process of temporarily stopping the power supply to the transmission processing unit may not be performed.

Hereinafter, the processing content of step ST5 in the protocol processing unit 33 will be described in detail.

FIG. 5 is a flowchart showing the processing contents of step ST5 in the protocol processing unit 33.

The protocol processing unit 33 of the base station 2 confirms whether or not the transmission waiting data of the mobile terminal 3 being served is stored in the transmission data buffer unit 34 (step ST21).

Here, the protocol processor 33 shows what the data presence / absence is confirmed. The downlink scheduler 42 or the uplink scheduler 43 may confirm the presence / absence of data through the protocol processor 33, or directly Check the presence of data in the transmit data buffer 34.

Further, the protocol processing unit 33 of the base station 2 performs transmission / reception between the mobile terminal 3 and the base station 2 that have transmitted the QoS of the service stored in the QoS storage unit 41, that is, the “Sleep request signal”. To confirm the QoS of the service (step ST22).

Here, the protocol processing unit 33 has been shown to check the QoS of the service, but the downlink scheduler unit 42 or the uplink scheduler unit 43 may check the service QoS through the protocol processing unit 33. Directly stored in the QoS storage unit 41 The service QoS may be confirmed.

[0074] Further, the protocol processing unit 33 of the base station 2 confirms information (eg, CQI) used for downlink scheduling of the mobile terminal 3 being served, which is grasped by the downlink scheduler unit 42 (step ST23).

Here, the power shown by the protocol processing unit 33 for confirming information used for downlink scheduling of the mobile terminal 3 may be confirmed by the uplink scheduler unit 43 through the protocol processing unit 33 for information used for downlink scheduling. Alternatively, the downlink scheduler section 42 may directly grasp and confirm information used for downlink scheduling.

[0075] Further, the protocol processing unit 33 of the base station 2 confirms the scheduling load in the downlink scheduler unit 42 (step ST24).

Here, the power shown for the protocol processing unit 33 confirming the load of the downlink scheduler unit 42 may be configured so that the uplink scheduler unit 43 confirms the load of the downlink scheduler unit 42 through the protocol processing unit 33. Check the load on the downlink scheduler 42 directly.

Note that the processing of steps ST21 to ST24 may be performed simultaneously, or may be performed in any order. Moreover, it is not necessary to perform the process of all the steps.

[0076] Based on the information confirmed in steps ST21 to ST24, the protocol processing unit 33 of the base station 2 determines whether or not the corresponding mobile terminal 3 can perform the DRX operation in the active (broad sense). (Step ST25).

Hereinafter, a specific example of the determination process in step ST25 in the protocol processing unit 33 will be described.

[0077] When the protocol processing unit 33 confirms in step ST21 that the transmission waiting data of the mobile terminal 3 that has transmitted the "S1 eep request signal" is stored in the transmission data buffer unit 34, , It is determined that DRX operation in Active (broad sense) is impossible.

If it is determined that the DRX operation in Active (broad sense) is possible when the transmission waiting data of the mobile terminal 3 that has transmitted the “Sleep request signal” is stored in the transmission data buffer unit 34, the DRX operation period The corresponding mobile terminal 3 is stored in the transmission data buffer unit 34. This is because it becomes impossible to receive the received data.

Further, the protocol processing unit 33 transmits / receives the QoS of the service stored in the QoS storage unit 41 confirmed in step ST 22, that is, the mobile terminal 3 and the base station 2 that have transmitted the “Sleep request signal”. If the demand for real-time performance is high, it is judged that DRX operation in Active (broad sense) is impossible.

If the QoS of the service has a high demand for real-time performance, if it is determined that DRX operation in Active (broad sense) is possible, during the DRX operation period, for example, a request for real-time performance from the base station controller 1 However, even if user data is transmitted, it becomes impossible to transmit the user data to the mobile terminal 3, and the requested QoS cannot be satisfied.

[0079] Also, if the information (eg, CQI) used for downlink scheduling of the affiliated mobile terminal 3 confirmed in step ST23 indicates poor quality, the protocol processing unit 33 temporarily stores data in the transmission data buffer unit 34. Even if there is data waiting for transmission to the corresponding mobile terminal 3, it is determined that DRX operation in Active (broad sense) is possible.

If the CQI value indicates poor quality, there is a high possibility that a reception error will occur even if data is sent to the corresponding mobile terminal 3 at a high speed. Allocating radio resources to another mobile terminal 3 exhibiting good quality with a good CQI value while realizing low power consumption of the mobile terminal 3 can increase the throughput of the entire mobile communication system. It is the power that can be done.

[0080] In addition, when the downlink scheduling load confirmed in step ST24 is high, the protocol processing unit 33 is active (in a broad sense) of the mobile terminal 3 that has transmitted the "Sleep request signal". Judge that DRX operation is impossible.

Realizing the active (in a broad sense) DRX operation for the mobile terminal 3 means that the downlink scheduler unit 42 is a monitor that confirms whether the mobile terminal 3 has the power to send data addressed to itself. It is necessary to secure resources for each DRX period of the signal, it is impossible to transmit to the mobile terminal 3 that is performing DRX operation in Active (broad sense), and DRX operation in Active (broad sense) The load becomes higher compared to the normal reception operation in that it is necessary to determine whether or not the transition to the period is possible. So scheduling This is because there is a case where the DRX operation in the active (broad sense) in the downlink scheduler unit 42 cannot be supported due to the load.

[0081] Here, instead of the protocol processing unit 33, the downlink scheduler unit 42 or the upstream scheduler unit is shown instead of the protocol processing unit 33 that determines whether or not the DRX operation in the active (broad sense) is possible. Either one of 43, or the downlink scheduler unit 42 and the uplink scheduler unit 43 may jointly determine.

The information used for the determination may be information other than the information confirmed in steps ST21 to ST24, or all of the information confirmed in steps ST21 to ST24 may not be used.

As apparent from the above, according to the first embodiment, it is determined whether or not the mobile terminal 3 can shift to the active DTX operation period, and the active DTX operation is determined. If it is determined that the base station 2 can transition to the active DRX operation period, the data transmission processing unit and the reception processing unit of the mobile terminal 3 can be obtained. Since the power supply to the mobile terminal 3 is temporarily stopped, the power consumption of the mobile terminal 3 can be efficiently realized.

[0083] That is, if the mobile terminal 3 is performing an active (broad sense) DTX operation, if it is (when performing a transmission operation), the transmission processing unit of the mobile terminal 3 (used only for wireless communication) Therefore, even if DRX operation is performed, effective low power consumption cannot be realized.

However, the base station 2 is notified of the “Sleep request signal” that is generated based on information that only the mobile terminal 3 can know (for example, the presence or absence of data in the transmission data notifier 13 of the mobile terminal 3). By doing so, the base station 2 can more actively perform the DRX operation simultaneously with the DTX operation.

As a result, the power consumption of the mobile terminal 3 can be more effectively realized. As a result, it is possible to lengthen the standby time and continuous call time of the mobile terminal 3.

In Embodiment 1, the power shown for mobile terminal 3 transmitting a “Sleep request signal” to base station 2 When mobile terminal 3 does not make a Sleep request, mobile terminal 3 Send “S1 eep unrequested signal” to base station 2. Hereinafter, an example of operation when the “Sleep unrequested signal” is used will be described with reference to FIG.

Parts where the step numbers are the same as those in FIG. 4 are assumed to perform the same processing as described in FIG.

Consider a case where the mobile terminal and the base station are in the state 2-A “Active (narrow sense)” in FIG. 13 (step ST1601).

When the state of the mobile terminal 3 is in state 2 “A _C tive (narrow sense;)” in FIG. 13, the DTX determination unit 19 of the mobile terminal 3 can shift to the active DTX operation period. It is determined whether or not (step ST1602).

[0086] Here, as an example of the DTX operation, information (for example, CQI) used by the mobile terminal 3 for uplink user data and downlink scheduling and a pilot signal (synchronous detection compensation of uplink data, phase of uplink data) The signal (used for compensation etc.) and the reference signal (Sounding Reference Signal) for the purpose of quality measurement of the uplink channel are not transmitted, and the operation (DTX: Discontinuous Transmission) is assumed.

The determination as to whether or not the DTX determination unit 19 is capable of performing the DTX operation is performed by, for example, checking the presence or absence of data in the transmission data buffer unit 13.

[0087] The Sleep request signal generation unit 20 of the mobile terminal 3 shifts to the active DTX operation period when the determination result of the DTX determination unit 19 indicates that the DTX operation cannot be performed. When the protocol processing unit 11 indicates that the sleep is not possible, a sleep unnecessary request signal is generated, and the sleep non-request signal is output to the transmission data buffer unit 13 as control data. Here, the sleep non-request signal is, for example, a signal having all of the following meanings (1) to (6), or any one of the meanings of (1) to (6), This signal has a combination.

(1) This means that mobile terminal 3 ends the active DTX operation period

(2) This means that there is data to be transmitted in the transmission data buffer unit 13 of the mobile terminal 3 or there is data to be transmitted immediately.

(3) Notify the amount of data in the send data buffer unit 13

(4) Request uplink resource allocation (scheduling)

(5) Request continuation of Active status

(6) This means requesting the end of the DRX operation period during Active

The sleep non-request signal is a signal that informs and propagates to the base station 2 all or a combination of the above meanings (1) to (6) or any one of the meanings (1) to (6). It's okay.

[0089] When the sleep request signal generation unit 20 stores the control data (Sleep non-request signal) in the transmission data buffer unit 13, the encoder unit 14 of the mobile terminal 3 stores the transmission data buffer unit 13 and controls it. The modulation unit 15 of the mobile terminal 3 that performs the encoding process on the data (Sleep non-request signal) modulates the control data (Sleep non-request signal) after the encoding process when the encoder unit 14 performs the encoding process. Control data after modulation (Slee

P unrequested signal) is output to antenna 16.

The antenna 16 of the mobile terminal 3 transmits the control data (Sleep unrequested signal) modulated by the modulation unit 15 to the base station 2 as a radio signal (step ST1603).

[0090] Here, as a method of notifying the force sleep unrequired signal shown for the mobile terminal 3 transmitting control data (Sleep unrequired signal) to the base station 2 as a radio signal, a method of mapping to a physical channel However, there is a method of mapping to MAC header etc. as MAC signaling.

[0091] When the antenna 37 of the base station 2 receives the radio signal transmitted from the mobile terminal 3, the antenna 37 outputs the radio signal to the demodulation unit 38. When receiving the radio signal from the antenna 37, the demodulator 38 of the base station 2 performs demodulation processing on the radio signal and outputs the demodulated control data (Sleep unrequested signal) to the decoder unit 39. .

The decoder unit 39 of the base station 2 performs a decoding process on the control data (Sleep unsolicited signal) after demodulation by the demodulator 38, and transmits the decoded control data (Sleep unsolicited signal) to the protocol processor 33 and Output to Sleep request signal determination unit 40.

[0092] When the sleep request signal determination unit 40 of the base station 2 receives the control data from the decoder unit 39, the sleep request signal determination unit 40 determines whether or not the sleep request signal is included in the control data. The result is output to protocol processing unit 33 (step ST1604).

When the protocol processing unit 33 of the base station 2 receives a determination result indicating that a sleep non-request signal is included from the sleep request signal determination unit 40! /, It determines that the DTX operation during active cannot be started. The process returns to step 1601.

On the other hand, if the protocol processing unit 33 of the base station 2 does not receive a determination result indicating that a sleep unrequested signal is included from the sleep request signal determining unit 40! It is determined whether or not it is possible to perform the DRX operation during the active state (step S T5).

[0093] If it is determined in this step ST5 that it is impossible to perform the DRX operation, the determination in step ST1604 and step ST5 may be repeated at regular intervals using a timer or the like.

Step ST1604 and step ST5 may be in any order.

If it is determined in step ST5 that the DRX operation can be performed, the processing of step ST6 and step ST7 is performed.

[0094] Upon receiving the radio signal from antenna 16, demodulator 17 of mobile terminal 3 performs demodulation processing on the radio signal, and outputs demodulated control data (determination result) to decoder unit 18. .

The decoder unit 18 of the mobile terminal 3 performs a decoding process on the control data (determination result) after demodulation by the demodulation unit 17 and outputs the decoded control data (determination result) to the protocol processing unit 11. The control unit 23 of the mobile terminal 3 determines whether or not it has received the notification of the transition to the DRXZDTX operation period in which the state of the mobile terminal 3 is active (state 2-B in FIG. 13) (step ST1 605). .

Step ST1605 If it is determined that the notification of transition to the active DRXZDTX operation period has been received, the processing of step ST10 and step ST11 is performed.

On the other hand, if it is determined in step ST1605 that the notification of transition to the active DRXZDTX operation period has not been received, the process of step ST12 is performed.

[0095] Further, in the first embodiment, the power shown for transmitting the determination result indicating whether or not the base station 2 is capable of shifting to the active DRX operation period to the mobile terminal 3 is shown. When base station 2 determines that it can shift to the active DRX operation period, it sends an instruction to transition to active DRXZDTX operation period (state 2-B in Fig. 13) to mobile terminal 3. Then, the mobile terminal 3 may transition to the active DRXZ DTX operation period (state 2-B in FIG. 13) according to the transition instruction of the base station 2.

[0096] Embodiment 2.

FIG. 6 is a sequence diagram showing the processing contents of the mobile communication system according to the second embodiment of the present invention. Hereinafter, processing contents of the mobile communication system will be described.

When the protocol processing unit 33 of the base station 2 determines that the mobile terminal 3 can perform the DRX operation in the active (broad sense), as in the first embodiment, the DRX in the active (broad sense) When performing operations, determine the DRX cycle used for Active (wide) DRX operation and the DTX cycle used for Active (wide) DTX operation to reduce the power consumption of mobile terminal 3 (step) ST31).

[0097] Here, the optimal DRX cycle and DTX cycle are as long as possible during which the power of the transmission processing unit and the reception processing unit (portion used only for wireless communication) of the mobile terminal 3 can be turned off. It is a cycle that is long (long in the range of the optimum time).

As a specific example, the optimal DRX cycle and DTX cycle are determined when the DRX cycle and the DTX cycle are equal to each other, or when the DRX cycle and the DTX cycle are determined as a multiple of the DRX cycle and the DTX cycle. The case where a period is coordinated is considered. Furthermore, as another example, when the DRX period and the DTX period are equal to each other and determined as the ヽ period, the DRX period and the DTX period are doubled. For example, the DRX period and the DTX period may be coordinated.

In the following, the case where the DRX cycle and the DTX cycle are determined to be equal to each other will be described in detail, but it is also possible to determine the DRX period and the DTX period to be equal to each other by the same method.

Hereinafter, with reference to FIG. 7, a specific example of a method for lengthening the period in which the power of the part used only for wireless communication of the mobile terminal 3 can be turned off will be described.

[0098] In FIG. 7, the transmission operation is executed !, NA! /, The period and the reception operation are executed !, NA !, the overlapping part of the periods is used only for wireless communication of the mobile terminal 3. This is the period during which the power can be turned off.

Pattern 1 in FIG. 7 shows an example in which the DTX cycle and the DRX cycle are determined in step ST31 in FIG. 6 (corresponding to Embodiment 1).

[0099] Pattern 2 in FIG. 7 shows that in step ST31 in FIG. 6, in order to make the period in which the power of the part used only for wireless communication of mobile terminal 3 can be turned off as long as possible, An example of determining the DRX cycle is shown.

The following (1) to (3) are considered as the DTX cycle and DRX cycle determined by! / In pattern 2.

(1) Make the DTX cycle equal to the DRX cycle

(2) Set the DTX cycle to a multiple of the DRX cycle (DRX cycle and DTX cycle are a multiple of the cycle)

(3) DTX cycle is a divisor of DRX cycle (DRX cycle and DTX cycle are a multiple of the cycle)

[0100] Pattern 3 in FIG. 7 shows that in step ST31 in FIG. 6, in order to maximize the period during which the power of the part used only for wireless communication of mobile terminal 3 can be turned off, An example is shown in which the DRX cycle is determined and the DTX cycle and the starting point of the DRX cycle are simultaneously determined. It is considered that adjusting the start time is included in coordinating the DRX cycle and the DTX cycle.

In this case, there may be a certain offset when the start of the DTX cycle and the start of the DRX cycle are matched together only when they are completely matched in time.

The offset includes uplink and downlink timing offsets, as well as the time required for the Active period during the DRX operation period and the time required for the Active period during the DTX operation period. An offset or the like that occurs when the values are different can be considered.

[0101] Compared to pattern 2, pattern 3 can extend the period during which the power of the part used only for wireless communication of mobile terminal 3 can be turned off.

Pattern 4 in FIG. 17 shows the D TX cycle and DRX cycle in order to maximize the period during which power can be turned off for the part used only for wireless communication of mobile terminal 3 in step ST31 in FIG. Show an example of matching the starting point! /, Ru. The adjustment of the start period is considered to be included in the coordination of DRX cycle and DTX cycle.

In cases such as when the DTX cycle or DRX cycle is repeated only once, even if the DTX cycle and DRX cycle are determined, they are only used once, so it does not make much sense.

[0102] A part that is used only for wireless communication of mobile terminal 3 when the start of DTX cycle and DRX cycle are combined using pattern 4 or when the DTX cycle or DRX cycle is repeated only once. It is possible to lengthen the period during which the power can be turned off. In this case, there may be a certain offset when the start of the DTX cycle and the start of the DRX cycle are matched together only when they are completely matched in time.

Possible offsets include uplink and downlink timing offsets, and offsets that occur when the time required for the Active period during the DRX operation period differs from the time required for the Active period during the DTX operation period. It is done.

Note that when the protocol processing unit 33 of the base station 2 determines the DTX cycle and the DRX cycle, the information “presence / absence of transmission-waiting data of the mobile terminal 3 being served”, which is confirmed in steps ST21 to ST24 in FIG. It may be determined in consideration of service QoS, information used by the downlink scheduler, and the load on the downlink scheduler.

Further, when the protocol processing unit 33 of the base station 2 determines the DTX cycle and the DRX cycle, the DTX cycle used in the Act (in a broad sense) may be determined to be infinite.

If the DTX cycle is determined to be infinite, the mobile terminal 3 does not transmit information (such as CQI) used for downlink scheduling during the active (in a broad sense) DRX / DTX operation period.

[0104] Also, the DTX cycle and DRX cycle determination processing is performed by either the downlink scheduler unit 42 or the uplink scheduler unit 43, or the downlink scheduler, instead of the protocol processing unit 33. Part 42 and the upstream scheduler part 43 may be performed jointly.

Here, the processing of step ST31 may be performed at the same time as the processing of step ST6. The processing of step ST31 shown for the processing performed before the processing of step ST6 may be performed.

[0105] When the protocol processing unit 33 of the base station 2 determines the DTX cycle and the DRX cycle, the DRXZDTX operation period during which the state of the base station 2 is active (state 2 in FIG. 13) as in the first embodiment. — Transition to B) (step ST6).

Next, the protocol processing unit 33 of the base station 2 determines whether or not the mobile terminal 3 is capable of performing DRX operation in Active (broad sense), that is, moves to the active DRX operation period. The result of determining whether or not the data can be transmitted is output as control data to the transmission data buffer unit 34, and the determination result of the DTX cycle and DRX cycle (DTX cycle information and DRX cycle information) is transmitted as control data. Output to data buffer 34.

However, the DTX cycle information includes an indicator showing the DTX cycle. The DRX cycle information includes an indicator that indicates the DRX cycle.

[0106] When the protocol processing unit 33 stores the control data (determination result, determination result) in the transmission data buffer unit 34, the encoder unit 35 of the base station 2 controls the control data (determination) stored in the transmission data buffer unit 34. Result, determination result) is performed. When the encoder unit 35 performs the encoding process, the modulation unit 36 of the base station 2 modulates the control data after the encoding process (determination result, determination result), and the control data after the modulation (determination result, determination result) Is output to antenna 37.

[0107] The antenna 37 of the base station 2 transmits the control data (determination result and determination result) modulated by the modulation unit 36 to the mobile terminal 3 as a radio signal (step ST32).

Here, as a method of notifying the force determination result and the determination result that the base station 2 transmits control data (determination result and determination result) to the mobile terminal 3 as a radio signal, a method of mapping to the physical channel is used. However, there is a method of mapping to MAC header etc. as MAC signaling.

The notification of the DTX cycle and DRX cycle may be notified only when the cycle is changed, or may be always notified regardless of the change of the cycle. Further, the start point of the DTX cycle and DRX cycle may be notified. The start is notified by a slot number, a frame number, a symbol number, and the like.

The notification of the start of the DTX cycle and DRX cycle may be notified only when the start is changed, or may be always notified regardless of the change of the start.

[0108] Note that, in the same manner as in the first embodiment, in the process of step ST2, a channel (transport channel, physical channel) in which a response signal (ACK signal ZNACK signal) from the base station 2 to the mobile terminal 3 exists is used. When the sleep request signal is transmitted, that is, the S1 eep request signal is transmitted from the mobile terminal 3 to the base station 2 using a channel (transport channel, physical channel) that supports high-speed retransmission control by HARQ. If it is sent, the response signal (ACK signal ZNACK signal) and control data (judgment result, decision result) may be sent together.

In this case, there is no need for further downlink scheduling compared to the case of transmitting control data (judgment result, decision result) using another channel (for example, DL-SCH), and less delay. This is advantageous in that control data (judgment result, decision result) can be notified by (Delay).

[0109] Upon receiving the radio signal transmitted from base station 2, antenna 16 of mobile terminal 3 outputs the radio signal to demodulation section 17 (step ST33).

When receiving a radio signal from the antenna 16, the demodulator 17 of the mobile terminal 3 performs a demodulation process on the radio signal and outputs demodulated control data (determination result and determination result) to the decoder unit 18.

The decoder unit 18 of the mobile terminal 3 performs a decoding process on the control data (determination result and determination result) after demodulation by the demodulation unit 17 and outputs the decoded control data (determination result) to the protocol processing unit 11 . The decoded control data (determination result) is output to the DTX cycle storage unit 21 and the DRX cycle storage unit 22.

[0110] The control unit 23 of the mobile terminal 3 determines whether or not the power of the mobile terminal 3 is changed to the active DRXZDTX operation period (state 2-B in FIG. 13) (step ST9).

The control unit 23 of the mobile terminal 3 indicates that the determination result of the DTX determination unit 19 can be shifted to the active DTX operation period in the process of step ST1, and When the protocol processing unit 11 obtains control data (determination result) of the base station 2 indicating that it is possible to shift to the active DRX operation period, the state of the mobile terminal 3 is changed to the active D RXZDTX operation period ( The decision to change to state 2-B) in Figure 13 is made.

[0111] When the DTX cycle storage unit 21 of the mobile terminal 3 receives the control data (DTX cycle information) after decoding from the decoder unit 18, that is, when it receives the DTX cycle information transmitted from the base station 2, Save the cycle information (steps ST34 and ST35).

When receiving the decoded control data (DRX cycle information) from the decoder unit 18, that is, receiving the DRX cycle information transmitted from the base station 2, the DRX cycle storage unit 22 of the mobile terminal 3 receives the DRX cycle information. Save (steps ST34 and ST35).

The DTX cycle storage unit 21 and the DRX cycle storage unit 22 store the DTX cycle information or DRX cycle information output from the decoder unit 18 by overwriting the already stored DTX cycle information or DRX cycle information, or Save separately.

Also, when information indicating the start of the DTX cycle and DRX cycle is received from the decoder unit 18, the start time is also stored.

[0112] When the control unit 23 of the mobile terminal 3 makes a determination to change the state of the mobile terminal 3 to the active DRXZDTX operation period (state 2-B in FIG. 13), Similarly, the state of mobile terminal 3 is changed to the active DRXZDTX operation period (state 2-B in FIG. 13) (step ST10).

[0113] When the control unit 23 of the mobile terminal 3 changes the state of the mobile terminal 3 to the active DRXZDTX operation period (state 2-B in FIG. 13), the DRX Operation and DTX operation are performed (step ST11).

Or according to the DTX cycle information, the period during which the power supply can be temporarily stopped and the DRX cycle The power supply to the transmission processing unit and the reception processing unit may be temporarily stopped during the period in which the power supply can be temporarily stopped according to the period information. The power supply to the unit 14, the modulation unit 15, the demodulation unit 17 and the decoder unit 18 is temporarily stopped.However, the target to stop the power supply is only an example. For example, the protocol processing unit 11, The power supply to the application unit 12, the transmission data buffer unit 13, the DTX determination unit 19, the Sleep request signal generation unit 20, the DTX cycle storage unit 21, the DRX cycle storage unit 22, etc. may be temporarily stopped. .

[0114] Even if the control unit 23 of the mobile terminal 3 indicates that the determination result of the DTX determination unit 19 can shift to the active DTX operation period in the process of step ST1, the protocol 23 When the processing unit 11 obtains control data (determination result) of the base station 2 indicating that it is impossible to shift to the active DRX operation period, the state of the mobile terminal 3 is changed to the active DRXZDTX operation period (Fig. Only DTX operation is performed (step ST12) without transition to state 2—B) of 13 (step ST12).

That is, the control unit 23 does not stop the power supply to the data reception processing unit (for example, the demodulation unit 17 and the decoder unit 18), and the period indicated by the DTX cycle information stored in the DTX cycle storage unit 21 Therefore, the supply of power to the data transmission processing unit (for example, the encoder unit 14 and the modulation unit 15) is temporarily stopped.

As is apparent from the above, according to Embodiment 2, when mobile terminal 3 receives DTX cycle information and DRX cycle information from base station 2, it follows the DTX cycle information and DRX cycle information. Since the power supply to the transmission processing unit and the reception processing unit is configured to be stopped, the power supply is stopped for an optimal period determined in consideration of the status of the mobile terminal 3 and the status of the entire mobile communication system. As a result, the power consumption of the mobile terminal 3 can be more efficiently realized. That is, according to the second embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.

Each time a transition to the active (in a broad sense) DRXZDTX operation period is determined, the optimal DTX cycle and D RX cycle are determined in consideration of the current status of mobile terminal 3 and the status of the entire mobile communication system. This is advantageous in that it can.

By combining the start of the DTX cycle and the DRX cycle, transmission operation and reception operation can be executed simultaneously. Thereby, it is possible to further lengthen the period during which the power of the part used only for wireless communication of the mobile terminal 3 can be turned off.

As a result, the power consumption of the mobile terminal 3 can be more efficiently realized, and the standby time and continuous call time of the mobile terminal 3 can be extended.

[0117] Furthermore, consider the case where the DTX cycle and DRX cycle are determined equally using pattern 2 in step ST31.

In this case, an example of the DRX cycle and DTX cycle notification method to the mobile terminal and the application method in the DRX cycle and DTX cycle mobile terminal will be explained.

In this case, in step ST32, only the DTX cycle (or DRX cycle) can be notified to the base station-powered mobile terminal.

The mobile terminal that has received only the DTX cycle stores the received DTX cycle in the DTX cycle storage unit 21 and the DRX cycle storage unit 22 (step ST35). Alternatively, the mobile terminal that has received only the DRX cycle stores the received DRX cycle in the DTX cycle storage unit 21 and the DRX cycle storage unit 22. Then, DRX operation and DTX operation are performed with the saved equal period. As a result, the information (cycle) notified to the mobile terminal of the base station power can be reduced. This is beneficial in terms of effective use of radio resources.

Furthermore, when the DRX cycle and the DTX cycle are the same, the DTX cycle storage unit 21 and the DRX cycle storage unit 22 can be made into one storage unit. As a result, the effect of reducing the hardware of the mobile terminal can be obtained.

[0118] Furthermore, in step ST31, DTX cycle and DRX cycle are coordinated using pattern 2.

Let us consider a case where it is determined as (a fixed relationship such as a multiple or a divisor in the pattern 2, pattern 3, pattern 4, etc.). In this case, an example of the DRX cycle and DTX cycle notification method to the mobile terminal and the application method in the DRX cycle and DTX cycle mobile terminal will be explained.

In this case, in step ST32, only the relationship between the DTX cycle (or DRX cycle) and cooperation can be reported to the mobile terminal by the base station power.

The mobile terminal that has received only the relationship between the DTX cycle and the cooperation stores the received DTX cycle in the DTX cycle storage unit 21, and stores the result calculated from the relationship between the DTX cycle and the cooperation in the DRX cycle storage unit 22 (step ST35). Alternatively, the mobile terminal that has received only the relationship between the DRX cycle and the cooperation stores the calculated result of the relationship between the received DRX cycle and the cooperation in the DTX cycle storage unit 21, and stores the DRX cycle in the DRX cycle storage unit 22. . Then, DRX operation and DTX operation are performed according to the saved cycle.

As a result, the information (cycle) notified to the mobile terminal of the base station power can be reduced. This is beneficial in terms of effective use of radio resources.

[0119] Furthermore, if the cooperative relationship (multiplier, divisor, constant relationship) is a value (static: Static) agreed in advance between the mobile terminal and the base station, in step ST32 It is not necessary to notify the relationship from the base station to the mobile terminal. This can further reduce the information (cooperation relationship) notified from the base station to the mobile terminal. This is beneficial from the viewpoint of effective use of radio resources.

The above information reduction can also be applied to Pattern 3 and Pattern 4, and similarly, it is possible to effectively use radio resources and achieve the same effect.

[0120] Modification 1 will be described below.

Depending on the conditions, the DRX cycle and DTX cycle determination method may be changed. As an example, (1) Step ST31 is executed only when the condition is satisfied, for example, the DRX cycle and the DTX cycle are made equal or coordinated, and if the condition is not satisfied, Step ST31 is not executed. To.

(2) Step ST31 is executed when the condition is satisfied, for example, DRX cycle and DTX cycle are coordinated, and step ST31 is also executed when the condition is not satisfied, for example, DRX cycle and DTX cycle are It may be possible to collaborate in a different relationship from when the above is satisfied. [0121] Specific examples of conditions include "whether to maintain uplink synchronization", "whether the DRX cycle (or DTX cycle) is greater than or equal to a threshold value", "elapsed time since the last TA was received" Whether or not is above a threshold.

As an example of Modification 1, consider a case where the transmission operation performed by the mobile terminal 3 in the DTX cycle is a transmission operation for performing uplink timing measurement by the base station.

[0122] To maintain uplink synchronization during the active DRXZDTX operation period, it is necessary to determine the DTX cycle that satisfies the uplink synchronization.

On the other hand, when uplink synchronization is not maintained, it is not necessary to determine a DTX cycle that satisfies the maintenance of uplink synchronization. Therefore, there is a merit that the DRX cycle and DTX cycle are determined separately depending on whether the conditions are met.

Specifically, in the DRXZDTX operation period during Active, step ST31 is executed when uplink synchronization is maintained, and step ST31 is not executed when it is not maintained. Of course, when maintaining, step ST31 may not be executed, and when not maintaining, step ST31 may be executed.

Thus, for example, when maintaining uplink synchronization, the DRX cycle and the DTX cycle and the start are the same (pattern 3), and when uplink synchronization is not maintained, the DRX cycle and the DTX cycle are different. Is possible.

[0123] Sarako considers the case where, for example, only the DRX cycle and the start period are notified from the base station to the mobile terminal in step ST32.

In this case, when maintaining uplink synchronization, the mobile terminal stores the DRX cycle and the start signal notified in step ST33 in the DTX cycle storage unit 21 and the DRX cycle storage unit 22 and applies to the DTX operation. To do.

On the other hand, if uplink synchronization is not maintained, the DRX cycle and start notified in step ST33 are stored only in the DRX cycle storage unit 22, and not stored in the DTX cycle storage unit 21, but in DTX operation. Does not apply. At this time, the DTX operation may follow the contents of the previous DTX cycle storage unit 21.

In this way, it is possible to reduce the notification information (cycle) from the base station to the mobile terminal and to determine the DRX cycle and DTX cycle separately depending on whether the conditions are met. Base station power Reducing information notified to mobile terminals is beneficial in terms of effective utilization of radio resources. Whether or not to maintain uplink synchronization in this case! The base station power may be notified to the mobile terminal separately from the cycle. Even in this case, since the information amount of the parameter indicating whether or not to maintain uplink synchronization is smaller than the information amount that notifies the DTX cycle, from the viewpoint of effective use of radio resources. Be beneficial

[0125] Also, in Embodiment 2 and Modification 1, the force DRX cycle (or DTX cycle) described when the base station force DRX cycle is transmitted to the mobile terminal is preliminarily determined. There may be. Even in that case, the above example is applicable.

As a specific example, when the determination result of whether or not the DRX operation can be performed is notified in step ST32, the mobile terminal stores a predetermined DRX cycle in the DTX cycle storage unit 21. (Step ST35). Then, DRX operation and DTX operation are performed with the saved equal period.

The DRX cycle (or DTX cycle) determined by force may be a value that is statically determined for the mobile communication system, or when a radio bearer session is started quasi-statically. Base station power L3 message transmitted to the mobile terminal may be notified.

[0126] In the second embodiment and the first modification, the mobile terminal 3 shows the power that is transmitted to the base station 2 when the mobile terminal 3 does not make a sleep request. Let terminal 3 send a “Sleep unsolicited signal” to base station 2.

FIG. 18 is a sequence diagram showing the processing contents of the mobile communication system when the “Sleep non-request signal” according to Embodiment 2 of the present invention is used. The detailed description of FIG. 18 is the same as the description of FIG.

Further, in this second embodiment, the base station 2 has been shown to transmit to the mobile terminal 3 a determination result indicating whether or not the base station 2 can shift to the active DRX operation period. If it is determined that it is possible to transition to the active DRX operation period, a transition instruction to the active DRXZDTX operation period (state 2-B in Fig. 13) is sent to mobile terminal 3 The terminal 3 may transition to the active DRXZ DTX operation period (state 2-B in FIG. 13) according to the transition instruction of the base station 2. [0127] Embodiment 3.

FIG. 8 is a sequence diagram showing the processing contents of the mobile communication system according to the third embodiment of the present invention.

In the first and second embodiments, it is possible to determine whether or not the mobile terminal 3 can shift to the active DTX operation period, and to shift to the active DTX operation period. In this case, if it is determined that the base station 2 can shift to the active DRX operation period, the power supply to the data transmission processing unit and the reception processing unit is temporarily stopped! As described above, the protocol processing unit 11 of the mobile terminal 3 determines whether or not priority is given to low power consumption (may be determined whether or not priority is given to throughput). In this case, the protocol processing unit 11 constitutes a priority determining unit, and the transmission data buffer unit 13, the encoder unit 14, the modulation unit 15, and the antenna 16 may be transmitted to the base station 2. Constitutes a parameter transmission means.

That is, in the third embodiment, mobile terminal capability information (UE) indicating the capability of mobile terminal 3

In Capabilities, a parameter indicating whether the mobile terminal 3 gives priority to low power consumption is provided. In this Embodiment 3, a description will be given of providing a parameter indicating whether or not the mobile terminal 3 prioritizes low power consumption. However, a parameter indicating whether or not the mobile terminal 3 prioritizes throughput is provided. Well ...

This parameter can be changed depending on factors such as the state of the mobile terminal 3 that is not unique to each mobile terminal 3 and the user's intention.

Alternatively, the entire mobile terminal capability information (UE Capabilities) including a parameter indicating whether power prioritizing low power consumption may be changeable! /.

[0129] In the third embodiment, the mobile terminal capability information (UE Capabilities) including the above parameters is moved even when RRC (Radio Resource Control) is connected (at the time of attachment, transmission, location registration, etc.). It is possible to notify the network side from terminal 3.

Specifically, notification is made when the mobile terminal capability information (UE Capabilities) indicating the capability of the mobile terminal 3 is changed. Alternatively, the mobile terminal capability information (UE Capabil Even if ities) are not changed, notifications shall be made at a predetermined cycle. When notification is made when the mobile terminal capability information (UE Capabilities) is changed, only the changed parameters may be notified, or the entire mobile terminal capability information (UE Capabilities) may be notified. Moyo! ,.

[0130] The processing contents of the mobile communication system will be specifically described below.

The protocol processing unit 11 of the mobile terminal 3 includes a parameter indicating whether or not to prioritize low power consumption when the mobile terminal capability information (UE Capabilities) is changed or for each predetermined period. The mobile terminal capability information (UE Capabilities) is output to the transmission data buffer unit 13 as control data.

Encoder unit 14 of mobile terminal 3 performs encoding processing on mobile terminal capability information (UE Capabilities) that is stored in transmission data buffer unit 13 and is control data.

[0131] Modulation section 15 of mobile terminal 3 modulates mobile terminal capability information (UE Capabilities), which is control data after encoding processing by encoder section 14, and antenna 16 transmits control data after modulation by modulation section 15. It transmits to the base station 2 as a radio signal (step ST41). Here, the power indicating that the mobile terminal 3 transmits the mobile terminal capability information (UE Capabilities) including parameters to the base station 2 as control data may be transmitted only to the base station 2.

[0132] Here, an example of mobile terminal capability information (UE Capabilities) will be described.

For example, when the mobile terminal 3 is used in the form of being inserted into a card slot of a notebook personal computer, it becomes “low power consumption priority: low” or “throughput priority: high”.

Further, when the mobile terminal 3 is used in the form of a mobile phone, the priority is “low power consumption priority: high V” or “throughput priority: low”.

In these cases, the battery capacity of the notebook personal computer is larger than the battery capacity of the mobile phone.

[0133] In the third embodiment, the mobile terminal 3 transmits the mobile terminal capability information (UE Capabilities) including parameters to the base station 2 as control data. Specific notification methods of UE Capabilities include a method called RRC (Radio Resource Control), a method of mapping to Layer 3 messages, a method of mapping to physical channels, and a MAC header as MAC signaling. There is a method of mapping to one.

At this time, if the notification is made simultaneously with the “Sleep request signal” shown in the first embodiment, the DRXZDTX operation period during Active by the “Sleep request signal” directly (state 2 in FIG. 13). — It is effective because it indicates the request priority of mobile terminal 3 for the transition to B).

In particular, an effective mapping method is disclosed when both the “Sleep request signal” and “low power consumption priority (throughput priority)” are mapped to the physical channel and notified.

[0135] There is “Happy BitJ t \, L1 signaling (physical channel mapping signal) that has been mapped to a physical channel from the past (3GPP Release6 standard TS25.309 etc.).

“Happy Bit” indicates whether or not the mobile terminal 3 is satisfied with respect to the current “Serving Grant value” given to the mobile terminal 3 from the uplink scheduler 43 of the base station 2 for uplink data transmission. This is an upstream indicator to notify the base station 2.

That is, it is an indicator that has meaning only when uplink data is transmitted. In other words, if there is a request in the “Sleep request signal”, the mobile terminal 3 has decided to start the active DTX operation period, so there is no point in transmitting “Happy Bit”. It is meaningful to transmit “low power consumption priority (throughput priority)”.

On the other hand, if there is no request with the “Sleep request signal”, the mobile terminal 3 decides to start the active DTX operation period, so it means that it means that “Happy Bit” is transmitted. Yes, “Low power consumption priority (throughput priority) There is no point in sending J.

[0136] If you try to map "Happy BitJ" Sleep request signal "and" Low power consumption priority (throughput priority) "to a physical channel as L1 signaling without any ingenuity, 3 bits are required. is there. For example, if mapping is performed as shown in FIG. 9, the same amount of information can be reported from the mobile terminal 3 to the base station 2 in 2 bits, and the mapping to the physical channel can be reduced by 1 bit. It becomes. Effective use of radio resources is effective!

Figure 9 shows an example. Mapping that switches the information indicated by the other bit to “Happy Bit” when “Sleep request signal” is not requested or “Requested” is switched to “Low power consumption priority (throughput priority)”. If so, it can be regarded as equivalent to the technology disclosed herein.

[0137] When the antenna 37 receives the radio signal transmitted from the mobile terminal 3, the demodulator 38 of the base station 2 demodulates the radio signal (step ST42).

The decoder unit 39 of the base station 2 performs a decoding process on the mobile terminal capability information (UE Capabilities) that is the control data after demodulation by the demodulation unit 38, and uses the decoded mobile terminal capability information (UE Capabilities) as a protocol. The data is stored in the processing unit 33 (step ST43).

[0138] The protocol processing unit 33 of the base station 2 refers to the parameter included in the mobile terminal capability information (UE Capabilities) and determines whether or not the mobile terminal 3 prioritizes low power consumption. Confirm whether or not priority is given to throughput (step ST44).

When the mobile terminal 3 gives priority to low power consumption, the protocol processing unit 33 of the base station 2 performs DR in Active state in order to achieve low power consumption in Active (broad sense) (state 2 in FIG. 13). An operation that enables transition to the XZDTX operation period (state 2-B in Fig. 13) is performed (step ST45).

For example, whether or not the base station 2 can receive the sleep request signal transmitted from the mobile terminal 3 and shift to the active DRX operation period by enabling the sequence in FIG. Make a decision.

[0139] When the mobile terminal 3 does not prioritize low power consumption (when priority is given to throughput), the protocol processing unit 33 of the base station 2 is in Active (broad sense) (state 2 in Fig. 13). Without realizing low power consumption, an operation that disables transition to the active DRXZDTX operation period (state 2-B in Fig. 13) is performed (step ST46).

For example, do not judge whether it is possible to shift to the active DRX operation period. [0140] As is apparent from the above, according to the third embodiment, whether or not to prioritize low power consumption is determined, and a parameter indicating the determination content is transmitted to the base station 2. This makes it possible to achieve further efficient realization of low power consumption during Active (broad sense) (state 2 in FIG. 13), and has the effect of realizing the optimal reduction in power consumption of the mobile terminal 3.

[0141] According to the third embodiment, the following effects can be obtained.

When the mobile terminal capability information (UE Capabilities) indicating the capability of the mobile terminal 3 is changed, the parameter is notified. Even if the mobile terminal capability information (UE Capabilities) is not changed, it is determined in advance. In this case, even when the mobile terminal 3 is active (state 2 in FIG. 13), the mobile terminal 3 can notify the base station 2 of mobile terminal capability information (UE Capabilities). . This effect becomes more prominent in the packet communication method, which is the concept of always-on connection. This is because the number of RRC connections is reduced because it is always connected, and there are few timings when the mobile terminal capability information (UE Capabilities) can be notified with the conventional technology.

As a result, the mobile terminal 3 can notify the base station 2 of the parameter change for whether to prioritize the realization of low power consumption or the improvement of throughput even during Active (state 2 in Fig. 13). Thus, the power consumption of Active (state 2 in Fig. 13) can be reduced more effectively. As a result, the power consumption of the mobile terminal 3 can be reduced more optimally.

[0142] As modification 1, in step ST44, the base station checks whether the mobile terminal 3 prioritizes low power consumption (or whether or not priority is given to throughput), and reduces power consumption. If it is determined that power is given priority, it may be possible to set the DRX cycle and DTX cycle to the threshold value X or higher in step ST45.

On the other hand, if it is determined in step ST44 that the mobile terminal 3 does not prioritize low power consumption, the base station may set the DRX cycle and DTX cycle to be shorter than the threshold value X in step ST46.

[0143] The length of the DRX cycle and the DTX cycle affects the low power consumption of the mobile terminal. If the cycle is long, the mobile terminal can be turned off for a longer period of time, so the low power consumption is reduced. It becomes easy to realize. Therefore, Active (broad sense) according to the state of the mobile terminal (Fig. 13 In this state 2), it is possible to further reduce the power consumption more efficiently, and it is possible to realize an optimum reduction in the power consumption of the mobile terminal 3.

In the first modification, “whether or not priority is given to low power consumption” and “whether or not priority should be given to a longer DRX cycle” or “priority to be allowed to allow a longer DTX cycle” It is also possible to notify the mobile terminal power base station separately of the parameters.

[0144] As Modification 2, in step ST44, the base station confirms whether the mobile terminal 3 prioritizes throughput (or whether low power consumption is prioritized), and does not prioritize throughput. If determined, in step ST45, it may be allowed to maintain uplink synchronization during the DRXZDTX operation period during uplink active! /.

On the other hand, if it is determined in step ST44 that the mobile terminal 3 prioritizes throughput, the base station may not allow the uplink synchronization to be maintained in the active DRXZDTX operation period in step ST46.ヽ.

[0145] If uplink synchronization is maintained, if data (control data, user data) is transmitted from the mobile terminal to the base station, a procedure of establishing uplink synchronization is required before data transmission. Become.

On the other hand, when uplink synchronization is maintained, such a procedure becomes unnecessary. Therefore, whether or not uplink synchronization is maintained affects the throughput. As a result, it is possible to achieve a more efficient reduction in power consumption during Active (broad sense) (state 2 in Fig. 13) according to the state of the mobile terminal, and to reduce the optimal power consumption of the mobile terminal 3. There is an effect that can be realized.

In Modified Example 2, the mobile terminal power is also separately notified to the base station of the parameters “whether or not priority is given to throughput (whether or not power is given priority to low power consumption)” and “whether or not power to maintain uplink synchronization” separately. Even if it does, it is realizable.

[0146] Embodiment 4.

In the third embodiment, the mobile terminal 3 includes a parameter indicating the determination result of whether or not power prioritizing low power consumption is included in the mobile terminal capability information (UE Capabilities), and the mobile terminal capability information (UE Capabilities) is the base. Force shown for what to send to station 2 above The parameters may be transmitted to the base station 2 separately from the mobile terminal capability information (UE Capabilities) without including the parameters in the mobile terminal capability information (UE Capabilities).

Note that the mobile terminal 3 transmits the above parameters to the base station 2 at predetermined intervals even when the above parameters are changed or not changed.

According to the fourth embodiment, there is an effect that the above parameters can be notified without changing the function of the mobile terminal capability information (UE Capabilities).

Modifications 1 and 2 of the third embodiment are also applicable to the fourth embodiment.

[0148] Embodiment 5.

FIG. 10 is a sequence diagram showing the processing contents of the mobile communication system according to the fifth embodiment of the present invention.

In Embodiment 3 above, the protocol processing unit 11 of the mobile terminal 3 determines whether or not priority is given to low power consumption, and includes a parameter indicating the determination content in the mobile terminal capability information (UE Capability). The mobile terminal capability information (UE Capabilities) is transmitted to the base station 2, and the protocol processing unit 11 of the mobile terminal 3 determines whether or not to prioritize low power consumption. Make a decision based on the remaining amount.

Specifically, it is as follows.

[0149] First, the protocol processing unit 11 (or control unit 23) of the mobile terminal 3 checks the remaining battery level (step ST51).

The protocol processing unit 11 (or control unit 23) of the mobile terminal 3 compares the remaining battery level with a predetermined threshold value (the lower limit remaining battery level where low power consumption should be prioritized), and the remaining battery level is If it is less than the threshold value, a decision to prioritize low power consumption (decision to not give priority to throughput) is made. On the other hand, if the remaining battery level exceeds a predetermined threshold, a decision is made not to give priority to low power consumption (decision to give priority to throughput) (step ST52).

[0150] Note that the protocol processing unit 11 (or the control unit 23) of the mobile terminal 3 determines whether or not to prioritize low power consumption in consideration of whether or not the battery is being charged. Anyway ヽ. If the battery is being charged, it is possible to perform operations that prioritize throughput without worrying about the remaining battery level.

The predetermined threshold value may be a predetermined value set in advance, or a value obtained by notification or calculation by an upper layer.

Since the processing contents of steps ST41 to ST46 are the same as those of the third embodiment, description thereof is omitted.

However, the parameter indicating the content of determining whether or not to prioritize low power consumption is not included in the mobile terminal capability information (UE Capabilities) and is not included in the mobile terminal capability information (UE Capabilities), as in the fourth embodiment. The above parameters may be transmitted separately to the base station 2.

[0151] In the fifth embodiment, the power S shown for transmitting to the base station 2 a parameter indicating the determination content of whether or not the mobile terminal 3 gives priority to the low power consumption, the mobile terminal ₃ May be transmitted to base station 2, and base station 2 may determine whether to prioritize low power consumption based on the remaining battery power.

The protocol processing unit 11 (or control unit 23) of the mobile terminal 3 checks the remaining battery level (step ST51).

Upon confirming the remaining battery level, the protocol processing unit 11 (or control unit 23) of the mobile terminal 3 transmits the remaining battery level to the base station 2 (step ST61).

As a specific method for notifying the remaining battery level, for example, there is a method of notifying the base station 2 with a layer 3 message using a protocol called RRC (Radio Resource Control). There are also a method of mapping to a physical channel and a method of mapping to a MAC header as MAC signaling.

[0153] Note that when the protocol processing unit 11 (or the control unit 23) of the mobile terminal 3 checks the remaining battery level, it checks whether or not the battery is being charged. The battery may be transmitted to the base station 2 on the assumption that the remaining battery level is maximum (or infinite). Alternatively, a parameter indicating whether or not the battery is being charged is transmitted to the base station 2 separately from the remaining battery level. It may be. Alternatively, a parameter indicating whether charging is in progress may be sent to the base station 2 without sending the remaining battery power.

[0154] As the information to be transmitted to the base station 2, the following (1) to (3) are conceivable.

(1) Send the absolute battery level

(2) Send the ratio of remaining battery capacity to battery capacity

(3) Send indicator

When sending an indicator, the amount of information to be sent can be reduced compared to sending the absolute value of the remaining battery level or the ratio of the remaining battery level to the battery capacity. Therefore, it is advantageous in that radio resources can be used effectively. FIG. 12 is an explanatory diagram showing an example of the indicator.

[0155] When the protocol processing unit 33 (or control unit 44) of the base station 2 receives the remaining battery level from the mobile terminal 3 (step ST62), the remaining battery level and a predetermined threshold (low power consumption must be prioritized). Are compared (step ST63).

The protocol processing unit 33 (or control unit 44) of the base station 2 can transition to the active DRXZDTX operation period (state 2-B in Fig. 13) if the remaining battery level is less than the predetermined threshold. (Step ST45).

On the other hand, if the remaining battery level exceeds a predetermined threshold value, an operation is performed to disable the transition to the active DRXZDTX operation period (state 2-B in FIG. 13) (step ST46).

[0156] In the case of the fifth embodiment, as in the third and fourth embodiments, the mobile terminal 3 has a large amount of remaining battery power. In this case, priority is given to the throughput, while the remaining battery power is small. Can operate with priority on low power consumption, and as a result, low power consumption can be achieved efficiently during Active (broad definition) (state 2 in Fig. 13).

Modifications 1 and 2 of the third embodiment are also applicable to the fifth embodiment.

[0157] Embodiment 6.

In the fifth embodiment, the battery remaining level is used as a criterion for determining whether or not to prioritize low power consumption. However, the user has given his / her intention to the mobile terminal 3 (prioritizing low power consumption). The mobile terminal 3 may decide whether to prioritize low power consumption based on the user's intention as a criterion. Alternatively, the mobile terminal 3 may transmit the user's intention to the base station 2, and the base station 2 may determine whether or not to prioritize low power consumption based on the user's intention.

[0158] In the case of the sixth embodiment, it is possible to operate according to the user's intention whether power is given priority to low power consumption (or whether to give priority to throughput), and as a result, Active ( In a broad sense), low power consumption in the middle (state 2 in Fig. 13) can be achieved efficiently according to the user's intention.

Modifications 1 and 2 of the third embodiment are also applicable to the sixth embodiment.

[0159] Embodiment 7.

Non-Patent Document 6 shows that a DRX cycle is transmitted from a base station to a mobile terminal together with initial transmission data. Normally, the DRX cycle is reported by the L1ZL2 control signal along with the initial transmission data.

On the other hand, in the LTE system, it is considered that H ARQ is applied in downlink data transmission and uplink data transmission. When HARQ (Hybrid ARQ) is applied, for example, in the downlink, the base station transmits data to the mobile terminal, and the mobile terminal sends an Ack signal ZNack signal to the base station according to the reception status of the data. Send. An Ack signal is transmitted when data reception is successful, and a Nack signal is transmitted when data reception is unsuccessful.

When the base station receives an Ack signal from a mobile terminal, it will transmit new data, but when it receives a Nack signal, it retransmits it. In other words, the base station performs retransmission until it receives an Ack signal indicating successful reception from the mobile terminal.

[0160] In Non-Patent Document 6, after receiving the Ack signal, the DRX cycle is counted from the end of a predetermined timer time.

However, when HARQ is applied and retransmission occurs, there is a problem if the base station transmits the DRX period together with the initial transmission data.

When the base station notifies the mobile terminal of the DRX cycle, the base station must decide the next time to allocate resources to the mobile terminal. However, if the base station transmits the DRX cycle together with the initial transmission data, if a Nack signal is returned from the mobile terminal and retransmission is necessary, the time allocated for the initial transmission data is increased accordingly. You will have to change back. In other words, the base station must change the time for allocating resources to the mobile terminal every time it retransmits. I have to do it.

Thus, when retransmission is considered, there arises a problem that the scheduling load of the base station increases.

[0161] In order to solve the above-described problem, Embodiment 7 discloses a method in which the base station notifies the mobile terminal of DRX cycle information using a control signal in the downlink.

FIG. 19 is an explanatory diagram showing an example of a method of notifying the DRX cycle from the base station to the mobile terminal.

In the figure, in the downlink, white represents data, and the horizontal line represents the DRX cycle (DRX interface).

ヽ L1ZL2 control signal, and hatched lines represent L1ZL2 control signal including DRX cycle. In the uplink, an Ack signal and a Nack signal are transmitted from the mobile terminal to the base station.

[0163] As shown in FIG. 19, the base station accompanies the data after receiving the Ack signal transmitted from the mobile terminal in the upstream rather than transmitting the DRX cycle information together with the initial transmission data as in the conventional case. Shina !, send with the first L1ZL2 control signal.

When receiving the Ack signal from the mobile terminal after transmitting the downlink initial transmission data, the base station transmits the DRX cycle (A) information at the transmission timing of the next L1ZL2 control signal ((1) in the figure) ) And move to DRX operation.

After the DRX operation, if there is no downlink data to be transmitted from the base station to the mobile terminal, only the L1ZL2 control signal is transmitted. This L1ZL2 control signal may contain DRX cycle information (see (2) in the figure).

If DRX cycle information is included, the DRX cycle (B) is updated and the DRX operation is entered. If the DRX cycle information is not included, you can decide in advance to apply the previous DRX cycle.

[0164] Next, after the DRX operation, when downlink data transmitted by the base station occurs, the downlink data is transmitted to the mobile terminal. The base station does not transmit DRX cycle information along with the downlink data.

Similarly, after the DRX operation, the mobile terminal receives base station downlink data, and if the reception result is not successful, transmits a Nack signal to the base station. The base station that has received the Nack signal from the mobile terminal transmits downlink retransmission data. The base station does not transmit DRX cycle information together with downlink retransmission data.

Next, the mobile terminal also receives downlink data with the base station power, and if the reception result is successful, transmits the Ack signal to the base station. The base station that has received the Ack signal from the mobile terminal transmits the L1ZL2 control signal including the DRX cycle information (see B in the figure) to the mobile terminal at the timing of transmitting the next L1ZL2 control signal.

In FIG. 19, in (3), although there is no change in (2) and DRX cycle (B), an L1ZL2 control signal containing DRX cycle (B) information is transmitted. If there is no change, it may be the information (trigger) that notifies the transition to DRX operation without including DRX cycle (B) information.

[0166] When there is downlink data, the start timing (starting period) of the DRX cycle includes the DRX cycle information or DRX transition information that the base station transmitted to the mobile terminal after receiving the Ack signal from the mobile terminal The transmission timing of the L1ZL2 control signal may be used.

If there is no downlink data, the transmission timing of the L1ZL2 control signal including the DRX cycle information transmitted to the mobile terminal by the base station or DRX transition information should be used.

FIG. 20 is a sequence diagram showing an example of processing contents between the mobile terminal and the base station.

The base station determines whether or not downlink data to the mobile terminal has been generated (step ST3201). If downlink data has been generated, the base station transmits an L1 ZL2 control signal that does not include the DRX cycle together with the downlink initial transmission data. (Step ST3202).

The mobile terminal receives the downlink data (step ST3203) and determines the data reception state (step ST3204).

[0168] If the reception result is successful, the mobile terminal transmits an Ack signal to the base station (step S T3205), and if the reception result is unsuccessful, the mobile terminal transmits a Nack signal to the base station (step S T3206).

The base station receives the reception result (Ack signal ZNack signal) from the mobile terminal (step ST 3208), and determines whether it is an Ack signal or a Nack signal (step ST3209).

If the determination result is a Nack signal, downlink retransmission data is transmitted (step ST3210). However, DRX cycle information is not sent with the retransmitted data. When transmitting the Nack signal, the mobile terminal receives the downlink retransmission data (step ST32 07), determines the reception state of the downlink data again, and transmits the Ack signal ZNa ck signal to the base station according to the determination result. To do.

[0169] The base station repeatedly transmits downlink retransmission data until the reception determination result from the mobile terminal becomes an Ack signal.

The mobile terminal transmits an Ack signal to the base station if the downlink retransmission data reception status determination result is successful.

When the reception determination result of the mobile terminal power is an Ack signal, the base station transmits an L1ZL2 control signal including the DRX cycle (step ST3211), and then proceeds to the DRX operation (step ST3213).

After receiving the L1ZL2 control signal including the DRX cycle (step ST3212), the mobile terminal proceeds to the DRX operation (step ST3215).

After the DRX cycle, the base station becomes capable of scheduling to the mobile terminal and shifts to active (step ST3214). Also, the mobile terminal becomes active after the DRX cycle (step ST3216).

[0170] Note that, when downlink data to the mobile terminal is not generated in the base station, the base station transmits an L1ZL2 control signal including a DRX cycle (step ST3211), and shifts to a DRX operation.

When receiving the L1ZL2 control signal including the DRX cycle (step ST3212), the mobile terminal shifts to the DRX operation at the DRX cycle included in the L1ZL2 control signal (step ST3 215).

Then, after the DRX cycle, the base station can perform scheduling for the mobile terminal and shifts to active (step ST3214). Also, the mobile terminal becomes active after the DRX cycle (step ST3216).

[0171] For example, when there is downlink data, the start timing of the DRX cycle is the transmission timing of the L1ZL2 control signal including the DRX cycle information transmitted to the mobile terminal after the base station receives the Ack signal from the mobile terminal. deep. If there is no downlink data, the base station sets the transmission timing of the L1ZL2 control signal including the DRX cycle information transmitted to the mobile terminal. As a result, the timing to become active after the DRX operation is the same between the base station and the mobile terminal, and the next data or L1ZL2 control signal can be transmitted and received.

[0172] In the above example, the DRX cycle information has been described as the information transmitted from the base station to the mobile terminal. However, if the DRX cycle is not changed, the DRX transition information may be used.

[0173] As disclosed above, the base station transmits DRX cycle information or DRX transition information to the mobile terminal using an L1ZL2 control signal that does not accompany the data after receiving the Ack signal.

In a system to which HARQ is applied, even when retransmission occurs, it is possible to shift to DRX operation without any problem.

Furthermore, it is not necessary to change the time for allocating resources to the mobile terminal for each retransmission.

The effect of reducing the scheduling load in the base station is obtained.

[0174] Furthermore, since the base station transmits DRX cycle information or DRX transition information to the mobile terminal using the L1ZL2 control signal after receiving the Ack signal, the DRX cycle is set according to the maximum number of HARQ retransmissions. Since there is no need to set more than the required time, the DRX cycle can be set arbitrarily without depending on the maximum number of HARQ retransmissions.

Also, even if the mobile terminal is unable to receive the DRX cycle or DRX transition information, the mobile terminal performs the reception operation without entering the DRX operation, and receives at the timing when the base station power is transmitted after the DRX cycle. Therefore, it is possible to eliminate the occurrence of reception errors after the DRX cycle.

In this way, even when the mobile terminal cannot receive the DRX cycle or DRX transition information and a state transition error occurs, the effect of eliminating the reception error can be obtained.

In addition, even if the base station receives an Ack signal with the mobile terminal power error, neither the base station nor the mobile terminal enters the DRX operation, so that an effect that a state transition error hardly occurs is obtained.

Furthermore, since a state transition error is unlikely to occur, an effect of eliminating the timer can be obtained.

[0175] In the above embodiment, the DRX cycle transmission timing of the base station power is set to the transmission timing of the first L1ZL2 control signal after receiving the Ack signal. In order to perform the transition, the transmission timing of the L1ZL2 control signal after receiving the Ack signal and after nXTTI (η is greater than 1) may be used.

As a result, the base station scheduler can adjust the timing for setting the DRX cycle according to the scheduling load after receiving the Ack signal.

[0176] The above n may be determined in advance, or may be notified from the base station to the mobile terminal before retransmission starts (for example, a radio bearer session is set up). At this time, notification by the L3 message transmitted from the base station to the mobile terminal, notification by the L1ZL2 control signal transmitted together with the initial transmission data, etc. can be considered).

As a result, the mobile terminal does not need to continuously receive the L1ZL2 control signal after transmitting the Ack signal until after nTTI, leading to low power consumption.

[0177] Also, in the above embodiment, the transmission timing of DRX cycle information or DRX transition information from the base station is set to the transmission timing of the first L1ZL2 control signal after receiving the Ack signal. Alternatively, send DRX transition information at a later timing, and transition to DRX operation when DRX transition information is sent.

By doing so, the scheduler load of the base station increases between the transmission timing of the DRX cycle information and the transmission timing of the DRX transition information. However, as shown in Non-Patent Document 6, the initial transmission is performed. Compared to the case where DRX cycle information is transmitted together with data, the base station scheduler load can be reduced.

[0178] Furthermore, as disclosed in Embodiment 2 above, it is also possible to apply a method in which the DTX cycle and the DRX cycle are equal or coordinated.

FIG. 21 is an explanatory diagram showing an example of a method for reporting the DRX cycle from the base station to the mobile terminal when the DTX cycle and the DRX cycle are equal.

In FIG. 21, in the downlink, white represents data, a horizontal line represents DR1 cycle (DRX interval) information1, L1ZL2 control signal, and a hatched line represents L1ZL2 control signal that includes DRX cycle. ing. In uplink, Ack signals, Nack signals, and sounding signals used for uplink channel quality evaluation and uplink synchronization are transmitted from the mobile terminal to the base station.

[0179] As shown in Fig. 21, the base station uses the DRX cycle information together with the initial transmission data as in the conventional example. The first L1ZL2 control signal after receiving the Ack signal transmitted from the mobile terminal in the uplink is transmitted.

When the base station receives the Ack signal from the mobile terminal after transmitting the downlink initial transmission data, it transmits the DRX cycle (A) information at the transmission timing of the next L1ZL2 control signal ((1) in the figure). Refer to), and move to DRX operation.

[0180] When the mobile terminal receives the L1ZL2 control signal including the DRX cycle (A) information, it sets the DTX cycle to the DRX cycle (A).

The mobile terminal transmits a sounding signal to the base station at the timing after the DTX operation in the DTX cycle (A) (see (4) in the figure).

When there is no downlink data to be transmitted to the mobile terminal after the DRX cycle (A), the base station transmits only the L1ZL2 control signal to the mobile terminal. This L1ZL2 control signal may include DRX cycle information (see (2) in the figure).

[0181] Upon receiving the L1ZL2 control signal including the DRX cycle (B) information, the mobile terminal sets the DTX cycle to the DRX cycle (B).

The mobile terminal transmits a sounding signal to the base station at the timing after the DTX operation in the DTX cycle (B) (see (5) in the figure).

When the downlink data to be transmitted to the mobile terminal occurs after the DRX cycle (B), the base station transmits the downlink data to the mobile terminal. However, the base station does not transmit DRX cycle information along with downlink data.

[0182] The mobile terminal receives downlink data from the base station, and if the reception result is not successful, transmits the Nack signal to the base station.

The base station that has received the Nack signal from the mobile terminal transmits downlink retransmission data. However, the base station does not transmit DRX cycle information together with downlink retransmission data.

When the mobile terminal receives downlink data from the base station and the reception result is successful, the mobile terminal transmits an Ack signal to the base station. The base station that has received the Ack signal of the mobile terminal power transmits an L1ZL2 control signal including DRX cycle (B) information at the timing of transmitting the next L1ZL2 control signal (see (3) in the figure).

[0183] When receiving the L1ZL2 control signal including the DRX cycle (B) information, the mobile terminal sets the DTX cycle to the DRX cycle (B).

The mobile terminal transmits a sounding signal to the base station at the timing after the DTX operation in the DTX cycle (B) (see (6) in the figure).

[0184] A series of operations between the mobile terminal and the base station is performed in step ST321 in the sequence of FIG.

In step 2, when the mobile terminal receives DRX cycle information transmitted from the base station, the D

A mobile terminal that uses the RX cycle information as the DTX cycle may shift to the DTX operation in the DTX cycle.

[0185] When there is downlink data, the DRX cycle start timing is L1ZL2 including DRX cycle information or DRX transition information transmitted to the mobile terminal after the base station receives the Ack signal from the mobile terminal. The transmission timing of the control signal may be used.

When there is no downlink data, the transmission timing of the L1ZL2 control signal including the DRX cycle information or DRX transition information transmitted from the base station to the mobile terminal may be used.

[0186] When there is downlink data, the start timing of the DTX cycle is the Ack from the mobile terminal to the base station immediately before the L1ZL2 control signal including the DRX cycle information or DRX transition information transmitted from the base station to the mobile terminal. Signal transmission timing may be used.

If there is no downlink data, the DRX cycle information sent from the base station to the mobile terminal or

The transmission timing of the sounding signal immediately before the L1ZL2 control signal including DRX transition information may be used.

[0187] When there is downlink data, the start timing of the DTX cycle may be the reception timing of the L1ZL2 control signal including the DRX cycle information or DRX transition information transmitted from the base station to the mobile terminal.

When there is no downlink data, the reception timing of the L1ZL2 control signal including DRX cycle information or DRX transition information transmitted from the base station to the mobile terminal may be used.

[0188] In the above example, the mobile terminal sets the DTX cycle to the DRX cycle notified from the base station. Force to be used The DRX cycle as shown in the second embodiment may be set. Also, the DTX cycle notification method and application method as shown in the second embodiment may be used.

[0189] As disclosed above, after the base station receives the Ack signal, it transmits DRX cycle information or DRX transition information to the mobile terminal using an L1 ZL2 control signal that is not accompanied by data, and the D TX cycle and DRX If the periods are made equal, even in a system to which HARQ is applied, in addition to the effect described in the seventh embodiment, the effect described in the second embodiment can be obtained.

[0190] Further, in Embodiment 7, the case where the DRX cycle information is transmitted from the base station to the mobile terminal using the L1ZL2 control signal or the like has been described. However, the DRX cycle information is preliminarily determined. In some cases, the base station allocates resources to the mobile terminal at the DRX cycle timing that is determined in advance. The present invention can also be applied to such a case.

The DRX cycle information that is determined in advance is notified by the L3 message transmitted to the mobile terminal when the radio bearer session is started.

DRX periodic force notified by L3 message For example, in the case of a time interval, the invention disclosed in Embodiment 7 can be applied. However, if the DRX cycle can be changed, it is only necessary to send DRX cycle information or DRX operation transition information using the L1ZL2 control signal transmitted to the base station power mobile terminal, but if the DRX cycle cannot be changed, If you cannot send DRX cycle information, send DRX operation transition information.

Both base stations and mobile terminals should move to DRX operation based on DRX cycle information or D RX operation transition information transmitted with L1ZL2 control signals.

[0191] DRX periodic power notified by L3 message For example, in the case of specifying absolute time, there is a problem that the time allocated in advance is changed by retransmission. For example, as an absolute time designation, 512 radio frames (10 ms) are numbered (0 to 511) on the time axis, and 10 radio frames are numbered (0 to 9) every ΤΠ, and this is repeated. It is possible that

The L3 message specifies which time to allocate. For example, radio frame number N (n = 0, 1, 2,..., 511).

In this case, the DRX cycle is started at the timing of [5] for every radio frame. The problem arises that retransmission occurs due to the downlink initial transmission data power HARQ generated at the timing of ΤΠNap5 of a certain radio frame, and the timing of ΤΠNamp5 of the next radio frame is exceeded.

[0192] In order to solve the above problem, DRX periodic power notified by L3 message For example, when absolute time is specified, the absolute time of DRX period is changed by the L1ZL2 control signal transmitted from the base station to the mobile terminal. Information may be notified.

Examples of parameters to be notified to change the absolute time include radio frame nanno, Πnanno, Πnanpa shift amount. For example, when Πnampa 9 is notified, force ΤΠnanpa shift amount 6 (ΤΠnanpa becomes 1) is notified. Similarly, a radio frame number may be notified.

If both the base station and the mobile terminal transition to DRX operation based on the change information of the absolute time of the DRX cycle transmitted by the L1ZL2 control signal.

[0193] By using the method disclosed above, when a radio bearer session is started, the base station power is also determined in advance by the L3 message or the like transmitted to the mobile terminal. However, if retransmission occurs due to HARQ and exceeds the next assigned timing, the next occurrence at the base station! /, And the downlink data cannot be transmitted! /! The problem can be solved.

[0194] Next, a case where a DRX cycle corresponding to a plurality of signals and a plurality of radio bearers is set in parallel will be described.

FIG. 22 is an explanatory diagram showing a case where a DRX cycle corresponding to multiple radio bearers is set in parallel in the downlink.

In Fig. 22, radio bearers (RB) # 1 and # 3 indicate flexible DRX cycle assignments, and RB # 2 indicates fixed DRX cycle assignments! /.

[0195] Here, flexible allocation is also called dynamic allocation, and the base station power is also notified to the mobile terminal by the L1ZL2 control signal transmitted together with the initial transmission data. In fixed allocation, resources are allocated at the DRX cycle timing determined by the base station. This is a case where it is assigned to the mobile terminal, and the predetermined DRX cycle information is notified by the L3 message etc. transmitted to the mobile terminal before the radio bearer session is started.

[0196] When multiple RBs are operating simultaneously, the DRX cycle is determined in the following two ways.

(1) The mobile terminal calculates from the DRX cycle of each RB notified from the base station

(2) The base station notifies the mobile terminal by calculating from the DRX cycle of each RB

[0197] In the case of (1), the first L1ZL2 control signal is received after the base station receives the Ack signal without the DRX cycle being notified from the base station to the mobile terminal by the L1ZL2 control signal transmitted with the initial transmission data. If the DRX cycle information or DRX operation transition information is notified by a signal, the method disclosed in the seventh embodiment can be applied. However, with regard to fixed allocation, as described above, the timing information for entering the DRX operation is shared between the base station and the mobile terminal, so it is necessary to notify the transition information of the DRX operation.

In the case of (2), the base station adjusts the DRX cycle and notifies it as one DRX cycle. Therefore, if there is at least one flexible allocation, the allocation is flexible. In addition, the fixed allocation only is fixed allocation. Accordingly, in this case as well, the method disclosed in the seventh embodiment can be applied.

[0198] As described above, when the DRX cycle corresponding to a plurality of radio bearers is set in parallel, by using the method disclosed in the seventh embodiment, the problem caused by HARQ can be solved. It can be solved.

Next, Modification Example 1 will be described.

In the above example, in the downlink, the data after the Ack signal is received by the base station is not attached. The power explaining the method of notifying the mobile terminal of the DRX cycle information using the L1ZL2 control signal, etc. Next, a method for notifying the mobile terminal of DTX cycle information using the L1 / L2 control signal after the base station transmits the Ack signal will be described.

FIG. 23 is an explanatory diagram showing an example of a method of notifying the DTX cycle from the base station to the mobile terminal when there is uplink data.

In FIG. 23, in the downlink, a horizontal line represents an L1 / L2 control signal including uplink resource allocation information, and a hatched line represents an L1ZL2 control signal including DTX period (DTX interval) information. Represents the signal. In addition, an Ack signal and Nack signal for uplink data are transmitted from the base station to the mobile terminal. In the uplink, white lines represent data and are transmitted from the mobile terminal to the base station.

[0201] As shown in FIG. 23, when the base station succeeds in receiving data transmitted from the mobile terminal in the uplink, the base station transmits the DTX period (A) information together with the Ack signal to the mobile terminal using the L1ZL2 control signal. (See (1) in the figure).

When receiving the DTX cycle (A) information from the base station, the mobile terminal shifts to the DTX operation of the DTX cycle (A) based on the transmission timing of the transmission performed immediately before receiving the DTX cycle (A) information. .

Next, if there is uplink data after the DTX cycle (A), the mobile terminal transmits initial transmission data to the base station.

[0202] If the base station fails to receive data transmitted from the mobile terminal in the uplink, the base station transmits uplink resource allocation for retransmission together with the Nack signal using the L1ZL2 control signal.

The mobile terminal that has received the Nack signal transmits retransmission data to the base station.

When the base station succeeds in receiving the retransmission data transmitted from the mobile terminal in the uplink, the base station transmits the DTX cycle (B) information together with the Ac k signal using the L1ZL2 control signal (see (2) in the figure).

) o

When receiving the DTX cycle (B) information from the base station, the mobile terminal shifts to the DTX operation in the DTX cycle (B) from the transmission timing of the transmission performed immediately before receiving the DTX cycle (B) information.

[0203] Here, in (2) of Fig. 23, if there is no change in the DTX cycle with (1), the Ack signal transmitted from the base station to the mobile terminal does not involve uplink resource allocation. It is not necessary to include DTX cycle information along with the Ack signal to be transmitted to the mobile terminal. In this case, it is enough to decide again that the DTX cycle notified immediately before the DTX cycle will be reached.

In addition, DTX cycle information has been described as information transmitted from the base station to the mobile terminal. However, as in the case of DRX, DTX transition information may be used when there is no change in the DTX cycle. [0204] The start timing of the DTX cycle may be the transmission timing of the transmission performed immediately before the mobile terminal receives the base station power DTX cycle information. The transmission timing power also shifts to DTX operation in the DTX cycle.

If there is no change in the DTX cycle and no DRX cycle information is sent from the base station to the mobile terminal, the transmission timing of the transmission performed immediately before the mobile terminal receives the Ack signal from the base station is As the start timing of the cycle.

[0205] The start timing of the DTX cycle may be a reception timing at which the mobile terminal receives the base station power DTX cycle information. The reception timing power also shifts to DTX operation in the DTX cycle.

If there is no change in the DTX cycle and no DRX cycle information is sent from the base station to the mobile terminal, the reception timing when the mobile terminal receives the Ack signal from the base station is the start timing of the DTX cycle. Good.

FIG. 23 shows, as an example, a case where resource allocation for uplink data has not been determined in advance. In this case, the mobile terminal receives an L1ZL2 control signal including uplink resource allocation information transmitted from the base station before transmitting uplink data. Based on the uplink resource allocation information, uplink data may be transmitted at the timing after the DTX operation using the resources.

If uplink data resource allocation is determined in advance, the mobile terminal may not receive uplink resource allocation information transmitted from the base station before transmitting uplink data. Timing after DTX operation Then, it is only necessary to transmit uplink data using resources determined by force.

[0207] Next, a case where uplink data is present and a case where uplink data is absent and cases are mixed are described.

When there is uplink data, a DTX periodic signal is transmitted together with an Ack signal transmitted from the base station to the mobile terminal. When there is no uplink data, DTX is transmitted using the L1ZL2 control signal transmitted from the base station to the mobile terminal after the uplink transmission signal. A method for transmitting the period will be described.

[0208] FIG. 24 is an explanatory diagram showing an example in which a sounding signal is used as an uplink transmission signal when there is no uplink data. In FIG. 24, in the downlink, a horizontal line represents an L1 / L2 control signal including uplink resource allocation information, and a hatched line represents an L1ZL2 control signal including DTX period (DTX interval) information. In addition, an Ack signal and Nack signal for uplink data are transmitted from the base station to the mobile terminal. In the uplink, white represents data, black represents a sounding signal, and is transmitted from the mobile terminal to the base station.

[0209] As shown in Fig. 24, the mobile terminal transmits uplink data together with the sounding signal to the base station.

When the base station succeeds in receiving the data transmitted from the mobile terminal, it transmits the DTX cycle (A) information along with the Ack signal and uplink timing adjustment signal (TA) using the L1ZL2 control signal ((1) in the figure). See).

[0210] Next, after the DTX cycle (A), the mobile terminal transmits a sounding signal to the base station when there is no uplink data.

When the base station receives the sounding signal, it transmits the D TX period (B) information along with the timing adjustment signal (TA) to the mobile terminal using the L1ZL2 control signal (see (2) in the figure). When the mobile terminal receives the DTX cycle (B) information from the base station, the mobile terminal transmits the DTX in the DT X cycle (B) from the transmission timing of the transmission (sounding signal transmission) performed immediately before receiving the DTX cycle (B) information. Move to operation.

[0211] Next, after the DTX cycle (B), when there is uplink data, the mobile terminal transmits initial transmission data together with the sounding signal to the base station.

When the base station fails to receive the data transmitted from the mobile terminal in the uplink, the base station transmits the uplink resource allocation for retransmission together with the Nack signal and timing adjustment signal to the mobile terminal using the L1ZL2 control signal. However, the Nack signal does not include the DTX cycle.

When the mobile terminal receives a Nack signal from the base station, the mobile terminal transmits retransmission data to the base station. When the base station succeeds in receiving the retransmission data transmitted from the mobile terminal in the uplink, The DTX cycle (C) information is transmitted to the mobile terminal using the L1ZL2 control signal along with the k signal (see (3) in the figure).

When receiving the DTX cycle (C) information from the base station, the mobile terminal shifts to the DTX operation of the DTX cycle (C) from the transmission timing of transmission performed immediately before receiving the DTX cycle (C) information.

[0212] Next, after the DTX cycle (C), the mobile terminal transmits a sounding signal to the base station when there is no uplink data.

When the base station receives the sounding signal, it transmits D TX period (D) information along with the timing adjustment signal (TA) to the mobile terminal using the L1ZL2 control signal (see (4) in the figure). When receiving the DTX cycle (D) information from the base station, the mobile terminal transmits the DTX cycle (D) from the transmission timing of the transmission (sounding signal transmission) performed immediately before receiving the DTX cycle (D) information. Move to DTX operation.

[0213] Next, after the DTX cycle (D), the mobile terminal transmits a sounding signal to the base station when there is no uplink data.

When the base station receives the sounding signal, it transmits the D TX period (E) information along with the timing adjustment signal (TA) to the mobile terminal using the L1ZL2 control signal (see (5) in the figure). When receiving the DTX cycle (E) information from the base station, the mobile terminal transmits the DTX in the DT X cycle (E) from the transmission timing of the transmission (sending signal transmission) performed immediately before receiving the DTX cycle (E) information. Move to operation.

[0214] Also in this case, if there is no change in the DRX cycle, the DRX cycle information may not be included together with the Ack signal transmitted from the base station to the mobile terminal. In this case, for example, it can be determined that it is the same as the previous DTX cycle.

[0215] The start timing of the DTX cycle may be the transmission timing of the transmission performed immediately before the mobile terminal receives the base station power DTX cycle information. The transmission timing power also shifts to DTX operation in the DTX cycle.

If there is no change in the DTX cycle and DRX cycle information is not sent from the base station to the mobile terminal, this is performed immediately before the mobile terminal receives an Ack signal or timing adjustment signal from the base station. The transmission timing of the transmitted transmission should be the start timing of the DTX cycle Yes.

[0216] The start timing of the DTX cycle may be a reception timing at which the mobile terminal receives the base station power DTX cycle information. The reception timing power also shifts to DTX operation in the DTX cycle.

If there is no change in the DTX cycle and no DRX cycle information is sent from the base station to the mobile terminal, the mobile terminal receives the Ack signal or timing adjustment signal from the base station. The start timing of the DTX cycle may be used.

In FIG. 24, the power shown when using a sounding signal as an upstream transmission signal when there is no upstream data is not limited to the sounding signal. For example, upstream transmission when there is no upstream data such as a CQI signal. Any signal may be used.

[0218] In the above example, the base station power is also described as the case where the DTX cycle information is transmitted to the mobile terminal using the L1ZL2 control signal. However, the DTX cycle information is preliminarily determined and the base station power The present invention disclosed herein can also be applied to the case where resources are allocated to mobile terminals at the timing of a DTX cycle determined by force.

The DTX period information that is determined in advance is notified by an L3 message transmitted from the base station to the mobile terminal when a radio bearer session is started. For example, in the case of a time interval or absolute time designation Even in this case, it can be applied by using the same method as in the downlink case.

[0219] Furthermore, even when a DTX cycle corresponding to multiple signals and multiple radio bearers is set in parallel, it can be applied by using a method similar to the method disclosed in the case of the downlink. It becomes possible.

Furthermore, as shown in the second embodiment, it is possible to apply a method in which the DRX cycle and the DTX cycle are equal or coordinated.

However, when it is necessary for the mobile terminal to receive a signal of some base station power related to uplink transmission, the time from the reception timing of the received signal to the transmission timing after the DTX operation can be used as a parameter. Good! /

[0220] FIG. 25 is an explanatory diagram showing the reception timing power of the received signal and the time parameter until the transmission timing after the DTX operation. Figure 25 (A) shows this when there is upstream data!

The base station sends DTX cycle (A) information to the mobile terminal together with an Ack signal for uplink data (see (1) in the figure).

When receiving the DTX cycle (A) information from the base station, the mobile terminal shifts to the DTX operation and makes the DRX cycle equal to the DTX cycle and shifts to the DRX operation.

However, the mobile terminal receives the uplink resource allocation in preparation for uplink data transmission after the DTX cycle (A), and therefore receives the parameter (tp) earlier than the DTX cycle (A).

Since the base station knows the DTX cycle (A) and parameter (tp) transmitted to the mobile terminal, it can calculate the timing for transmitting the uplink resource allocation to the mobile terminal.

[0221] Fig. 25 (B) shows the case where uplink CQI is transmitted.

After the base station transmits CQI to the mobile terminal, it transmits DTX cycle (B) information to the mobile terminal (see (2) in the figure).

When receiving the DTX cycle (B) information from the base station, the mobile terminal shifts to the DTX operation and makes the DRX cycle equal to the DTX cycle and shifts to the DRX operation.

However, since the mobile terminal receives the downlink reference signal in preparation for CQI transmission after the DTX cycle (B), it receives the parameter (tp) earlier than the DTX cycle (B).

Since the base station knows both the DTX cycle (B) transmitted to the mobile terminal and the parameter (tp), it can calculate the timing for transmitting the downlink reference signal to the mobile terminal.

[0222] The parameter (tp) may be a positive value (the transmission timing force is received earlier by tp) or a negative value (the transmission timing force is received later by tp).

The meter (tp) can be pre-set and shared between the base station and the mobile terminal, or it can be moved from the base station when a radio bearer session is started. The terminal may be notified, or the base station and the mobile terminal may be notified together with the DTX cycle. By using the method disclosed here, the DRX cycle and the DTX cycle can be formally equalized, and the effects described in the second embodiment can be obtained.

Next, Modification Example 2 will be described.

This section explains how the base station notifies the mobile terminal of DTX cycle information and DRX cycle information when there is data transmission in the downlink and uplink, respectively. To do.

[0224] When there is data transmission in each of the downlink and uplink, when HARQ is applied, the uplink data is terminated first, and even if there is only downlink data, the uplink Ack for the downlink data is present. Signal ZNack signal is required.

Also, even if downlink data ends first and there is only uplink data, a downlink Ack signal ZNack signal for that uplink data is required.

Therefore, even if the DRX cycle and DTX cycle are set to different values, it is not possible to shift to DRX operation or DTX operation until both upstream and downstream data are completed.

Therefore, it is useless to set the DRX cycle and DTX cycle to different values.

[0225] Furthermore, if the base station notifies the mobile terminal of both the DRX cycle and the DTX cycle, and the start timing of the DRX operation and the start timing of the DTX operation operate individually, the Ack signal is transmitted in the downlink or uplink. Even though there is ZNack signal transmission, it shifts to DRX operation or DTX operation, which causes a problem of receiving errors in uplink or downlink.

Therefore, when there is data transmission in the downlink and uplink, it is preferable to make the DRX cycle and DTX cycle the same.

[0226] In Modification 2, when there is data transmission in the downlink and the uplink, respectively, the DRX cycle and the DTX cycle are made the same, and the downlink data ends first, as disclosed in Embodiment 7 above. When the method for uplink data transmission is applied and the uplink data ends first, the method to which the method for downlink data transmission disclosed in Embodiment 7 is applied is applied.

[0227] Fig. 26 shows the DRX cycle and the DTX cycle from the base station to the mobile terminal when there is data transmission in the downlink and the uplink, and the DRX cycle and the DTX cycle are the same. It is explanatory drawing which shows an example of a method.

In this case, it can be divided into the following two states.

(1) When downlink data ends first

(2) When upstream data ends first

[0228] Fig. 26 (A) shows the case where downlink data ends first, and (B) shows that uplink data ends first. Shows when to do.

When the downlink data ends first, the base station transmits DTX cycle (A) information to the mobile terminal using the L1ZL2 control signal along with the Ack signal for the uplink last transmitted data or the uplink last retransmitted data (in the figure). (See (1)).

When receiving the DTX cycle (A) information from the base station, the mobile terminal makes the DRX cycle equal to the DTX cycle (A).

[0229] The start timing of the DRX cycle is the transmission timing of the L1 ZL2 control signal including the DTX cycle that the base station transmits to the mobile terminal.

The start timing of the DTX cycle is the transmission timing of the last uplink (retransmission) data that the mobile terminal transmits to the base station.

[0230] In the method disclosed here, downlink (retransmission) data is transmitted from the base station to the mobile terminal, compared to the case where the seventh embodiment is applied to downlink data and the modification 1 is applied to uplink data. There is no need to send DRX cycle information after the completion. Therefore, it is possible to reduce the scheduling load of the base station scheduler.

[0231] When the uplink data ends first, the base station receives the Ack signal for the downlink final initial transmission data or the downlink final retransmission data, and then transmits the DRX cycle (B) information by the first L1ZL2 control signal. Transmit to the mobile terminal (see (2) in the figure).

When receiving the DTX cycle (B) information from the base station, the mobile terminal sets the DTX cycle equal to the DRX cycle (B).

[0232] The start timing of the DRX cycle is the transmission timing of the L1 ZL2 control signal including the DRX cycle transmitted from the base station to the mobile terminal.

The start timing of the DTX cycle should be the transmission timing at which the mobile terminal transmits an Ack signal for the last downlink (retransmission) data transmitted to the base station.

[0233] Also, if the mobile terminal needs to receive a signal from some base station prior to uplink transmission, the reception timing power may also be set as a parameter up to the transmission timing after the DTX operation. .

Thereby, the mobile terminal can calculate the reception timing of a signal of some base station received by the mobile terminal prior to uplink transmission. The parameter may be set in advance and shared between the base station and the mobile terminal, or notified from the base station to the mobile terminal when a radio bearer session is started. The base station and other mobile terminals may be notified along with the DTX period!

[0234] The method disclosed here applies the final uplink (retransmission) from the base station to the mobile terminal, compared to the case where the seventh embodiment is applied to the downlink data and the modification 1 is applied to the uplink data. There is no need to send DTX cycle information after the data is completed. Therefore, the scheduling load of the base station scheduler can be reduced.

[0235] According to the invention disclosed in Modification 2, when there is data transmission in the downlink and the uplink, the DRX cycle and the DTX cycle are made the same, and the downlink data ends first. When the method for uplink data transmission disclosed in Embodiment 7 is applied and the uplink data ends first, the method for downlink data transmission disclosed in Embodiment 7 is applied, so that the above Embodiment 2 In addition to the effects described in (1) above, the setting operation of the useless DRX cycle or DTX cycle is eliminated, and even if the Ack signal ZNack signal is transmitted in the downlink or uplink, the operation shifts to the DRX operation or DTX operation. As a result, it is possible to eliminate the occurrence of uplink or downlink reception errors.

[0236] Embodiment 8.

In the seventh embodiment, data transmission by HARQ mode succeeds in data transmission by HARQ during DRX (DTX) operation (in the case of DRX, the Ack signal is transmitted from the mobile terminal, and in case of DTX, the base We explained how to notify the base station power mobile terminal of the DRX (DTX) period until the next data transmission using the L1ZL2 control signal when an Ack signal is transmitted from the station.

As a result, even if HARQ retransmissions continue and the original DRX cycle is exceeded, the DRX (DTX) period is notified to the base station power mobile terminal after the last transmission is completed. There is no danger of accidentally entering DRX (DTX) operation during HARQ retransmission. There is a problem that the terminal needs to receive the L1ZL2 control signal of the base station power once after transmitting the Ack signal In addition, the timing power at which the next Active starts during the DRX (DTX) operation period depends on the timing of successful transmission by HARQ. There is a problem of not sticking.

[0237] In this eighth embodiment, in HARQ data transmission during DRX operation, the DRX (DTX) period is set at the initial transmission, and the DRX (DTX) period end timing set first by retransmission at HARQ is set. Even if it has exceeded, DRX (DTX) operation is prioritized and retransmission is prioritized, and DRX (DTX) period end timing is further extended by the next DRX (DTX) period and reset. ) A control method will be described.

Also, when data transmission using HARQ is repeated, the DRXZDTX control is performed without worrying about the number of retransmissions even if the initial DRX (DTX) period end timing is exceeded due to repeated retransmissions. As a result, it is possible to reduce the scheduling load on the base station side.

[0238] Also, as in Embodiment 7 above, in downlink transmission, there is no need to transmit an L1ZL2 control signal from the base station to the mobile terminal halfway, and the mobile terminal does not wait for the L1ZL2 control signal from the base station. It is possible to shift to DRX operation. In addition, as in Embodiment 7 above, the next Active (WakeUp) timing may vary depending on the number of HARQ retransmissions, but the extended period is constant with respect to the DRX cycle set at the first transmission. Since it is determined according to the rules, the interval until the start of each transmission can be assumed to some extent. In addition, by setting the DTX (DRX) cycle according to certain rules, it is possible to obtain the effect of facilitating the handling of sudden changes in traffic.

FIG. 27 is a sequence diagram showing a control flow in the DRX operation of the mobile communication system according to the eighth embodiment of the present invention.

Hereinafter, the DRX control flow of the mobile communication system according to the eighth embodiment will be described.

When it is known that the base station and the mobile terminal are active (in a broad sense), downlink data that requires DRX operation is generated.

At this time, the base station shifts to a DRX cycle setting process, and sets the DRX cycle used for the active (in a broad sense) DRX operation to reduce the power consumption of the mobile terminal 3 (slow). Step ST5101).

FIG. 29 is a flowchart showing an example of the DRX cycle setting operation in step ST5101.

As shown in Figure 29, this method can be applied to both DTX cycle setting and DRX cycle setting.

First, the protocol processing unit 33 of the base station 2 confirms whether or not the DRXZDTX is operating and determines that it is not operating (step ST5301). It is determined whether or not it is possible to perform DRX operation or DTX operation in Active (broad sense) (step ST5302).

[0241] If the DRXZDTX operation can be performed and only the data transmitted by the base station or the one that periodically generates the control signal power idle period is set, the DRX operation mode is set (step ST5303).

If DRX or DTX operation is required and there are two or more data and control signals with different DRXZDTX periods (step ST5304), the current force in each DRXZDTX period is the closest, and the DRXZDTX period end timing is calculated. Compare (step ST5305).

[0242] Then, the closest DRXZDTX period end timing from the data transmission start timing is set to "next DRXZDTX period end timing". At this time, similarly, the next DRXZDTX period end timing is set as the “next DRXZDTX period end timing” from the next WakeUp timing (if there is transmission data, the next data transmission start timing) (step ST5306). ).

Furthermore, the timing difference between the next DRXZDTX period end timing and the data transmission start timing is set as the “DRXZDTX cycle”. At this time, similarly, the next DRX ZDTX cycle and the subsequent DRXZDTX cycle are also calculated (step ST5307).

[0243] When the base station sets the DRX cycle as described above (step ST5101), the base station notifies the mobile terminal of these DRX cycle information (including the next DRX cycle information) using the L1ZL2 control signal together with the data. (Step ST5102). If the base station repeats the second and subsequent operations after entering this DRX operation mode, and the DRX period ends. If there is no data to be transmitted when WakeUp is performed after completion (step ST5119), only the L1ZL2 control signal including DRX cycle information is transmitted to the mobile terminal.

The mobile terminal receives data and an L1ZL2 control signal from the base station (step ST5103).

) o

If the mobile terminal is not in the HARQ mode (step ST5104), the mobile terminal performs DRX operation (sleep) until the next “DRX period end timing” based on the DRX cycle in which the base station power is also notified (steps ST5118 and ST5120).

[0244] When the mobile terminal is in the HARQ mode (step ST5104), the mobile terminal checks the data received in step ST5103. If there is no problem with the received data, the mobile terminal transmits an Ack signal to the base station (step ST5108). If there is a problem with the received data, a Nack signal is transmitted to the base station (step ST5107).

[0245] Similar to the mobile terminal, the base station confirms whether or not it is in the HARQ mode (step

ST5105), if not HARQ mode, wait until the next “DRX period end timing”.

If it is in the HARQ mode, the Ack signal ZNack signal transmitted from the mobile terminal is received (step ST5109), and if the Ack signal is received, the process proceeds to step ST5113 (step ST5110).

On the other hand, if the Ack signal is not received, only the data is retransmitted to the mobile terminal (step ST5111).

The base station repeatedly performs the processes of steps ST5109 to ST5111 until it receives an Ack signal from the mobile terminal. Similarly, the mobile terminal receives the retransmission data (step ST 5112), and transmits the Ack signal that does not cause a problem in the received data to the base station (step ST5 108). Repeat.

[0246] When receiving the Ack signal from the mobile terminal, the base station checks whether or not the DRX period end timing based on the DRX cycle set in step ST5101 is exceeded (step ST5113).

If the current timing exceeds the DRX period end timing, the base station extends the DRX period end timing by the “next DRX cycle” calculated in step ST5101. Update “next DRX period end timing” as “next DRX period end timing” (step ST5115).

Alternatively, in step ST5115, the processing of DRXZDTX cycle setting steps ST5304 to ST5307 shown in FIG. 29 is performed, and the “next DRX cycle” is recalculated, and the DRX period end timing is newly calculated. The timing extended by “cycle” may be updated as “end timing of next DRX period”.

Thereafter, the base station returns to the process of step ST5101 when the next DRX period end timing has passed (step ST5119) and sets the next DRX cycle (step ST5101).

[0247] The same operation is performed in the mobile terminal.

That is, when the mobile terminal exceeds the “DRX period end timing” obtained at step ST5103 in step ST5103, the base station power received DRX cycle information power in the received L1ZL2 control signal is exceeded. The “next DRX period end timing” obtained by extending the “period period end timing” by “next DRX cycle” is updated as “next DRX period end timing” (step ST5116).

Thereafter, the mobile terminal sleeps until “next DRX period end timing” (steps ST5118 and ST5120), and after the DRX operation (after WakeUp), returns to the processing of ST5103 and waits for reception from the base station power.

The “next DRX period end timing” in step ST5116 may receive the base station power in step ST5103. In step ST5103, only “DRX period” and “next DRX period” are received, and based on this, “Next DRX period end timing” may be calculated and reset in steps.

[0248] Alternatively, in step ST5103, there are two or more DRX cycle information (data, control signal, etc. to be transmitted) for each data and control signal generated in the downlink. All DRX cycle information) using the L1ZL2 control signal, and after successful retransmission, if it is determined that the timing when proceeding to step ST5114 exceeds the “DRX period end timing”, the mobile terminal side In step ST5116, based on these DRX cycle information, the “next DRX cycle” is recalculated and the “DRX period end timing” is recalculated by the method described in steps ST5304 to ST5307 in FIG. You can update the timing extended by “the DRX cycle times” (= “the next DRX period end timing” recalculated) as the “next DRX period end timing”! /.

As a result, it is possible to reduce the amount of DRX cycle information that is notified by the base station power using the L1ZL2 control signal in step ST5102, and to effectively use radio resources.

FIG. 30 is a timing chart showing an actual operation by the DRX operation control sequence described in FIG.

Fig. 30 shows an example of timing when data retransmission occurs in HARQ mode and the timing at which retransmission is over exceeds the DRX cycle in downlink communication.

[0250] First, an L1ZL2 control signal including the first data and DRX cycle information (DRX cycle (A)) is transmitted to the mobile station in the downlink (corresponding to ST5102 in Fig. 27).

Since the mobile terminal is in the HARQ mode, it receives the DRX cycle (A) via the L1ZL2 control signal, calculates the “DRX period end timing” based on this, and whether the received data has a problem. If there is a problem with the received data, the Nack signal is transmitted to the base station on the uplink.

When the base station receives the Nack signal, it retransmits the data to the mobile terminal on the downlink again. At this time, DRX cycle information is not included in the L1ZL2 control signal.

[0251] If there is no problem with the second received data, the mobile terminal transmits an Ack signal on the uplink to the base station, and then sleeps until the calculated "DRX period end timing".

On the other hand, the base station similarly waits until the “DRX period end timing”, and then sets the next DRX cycle (B) in step ST5101 and notifies the mobile terminal with the L1ZL2 control signal. At this time, since no downlink user data is generated, only the L1ZL2 control signal is transmitted.

[0252] After the “DRX period end timing”, the mobile terminal wakes up, receives the L1ZL2 control signal including the information of this DRX cycle (B), calculates the next “DRX period end timing”, and performs this DRX Sleep until period end timing (A + B timing).

After waiting until the timing “A + B”, the base station sets a new DRX cycle (A) in step ST 5101 and notifies the mobile terminal with an L1ZL2 control signal.

At this time, downlink user data is generated, and downlink user data is transmitted together with the L1ZL2 control signal. Sent to the mobile terminal.

[0253] The mobile terminal that has been sleeping until the timing of "A + B" receives the L1ZL2 control signal and user data including a new DRX cycle (A) after WakeUp.

At this time, transmission by HARQ does not succeed due to degradation of radio quality, reception by the mobile terminal succeeds at the third retransmission (fourth transmission in total), and the mobile terminal bases the Ack signal on the uplink. Send to the station.

At this point, the DRX period end timing (A + B + A timing in Fig. 30) calculated by the first notified DRX cycle (A) has been exceeded, so the “DRX period end timing” The timing extended by DRX cycle (A) is reset to “DRX period end timing (A + B + 2 XA timing)”, and the mobile terminal and the base station sleep until this timing.

[0254] As described above, by performing DRX control considering the HARQ mode, it is possible to perform DRX control without any problem even if the retransmission due to HARQ is prolonged.

In addition, when the retransmission due to HARQ is prolonged, both the base station and the mobile terminal automatically update the next DRX period end timing, thereby reducing the scheduling load on the base station side compared to the conventional example. Can be reduced.

Furthermore, as in Embodiment 7 above, the DRX operation does not have to wait for the L1ZL2 control signal from the base station on the mobile terminal side, which does not need to be transmitted from the base station to the mobile terminal with the L1ZL2 control signal in the middle of downlink transmission The power consumption can be further reduced.

[0255] Similarly, DTX control of a mobile communication system is also described.

FIG. 28 is a sequence diagram showing the flow of DTX control in the mobile communication system. The flow of DTX control in the mobile communication system is described below.

[0256] First, when data transmission is performed on the uplink, and transmission data is generated on the mobile terminal side (step ST5201), the mobile terminal requests scheduling for resource allocation for uplink transmission. A scheduling request (hereinafter referred to as SR) is transmitted to the base station (step ST5202).

When the base station receives the SR from the mobile terminal (step ST5203), it reserves uplink resources (step ST5205), sets the DTX cycle (step ST5206), and Information is reported to the mobile terminal via the downlink L1ZL2 control signal.

Regarding the DTX cycle setting method in step ST5206 !, describe it in the explanation of DRX control! / I ’ll skip it.

[0257] When the mobile terminal receives uplink resource allocation, DTX cycle information, and the like from the base station via the L1ZL2 control signal (step ST5207), based on this information, the mobile terminal sets radio resources for transmission, DTX The period and “DTX period end timing” are set (step ST5207), and uplink data transmission is started (step ST5208).

When the base station receives uplink data from the mobile terminal (step ST5209), if it is not in HARQ mode (step ST5211), the base station performs step S according to the “DTX period end timing”.

Return to T5206 processing and set the next DTX cycle.

If in HARQ mode (step ST5211), check the received data (step ST5

212), if there is no problem with the received data, send an Ack signal to the mobile terminal (step

If there is a problem with the received data (ST5214), a Nack signal is transmitted to the mobile terminal (step ST5213).

[0258] The mobile terminal receives the Ack signal or the Nack signal from the base station (step ST5216). If the Ack signal is received (step ST5217), the mobile terminal proceeds to the process of step ST5220 and receives the Nack signal. If there is (step ST5217), the uplink data is retransmitted to the base station (step ST5218).

The processing of steps ST5216 to ST5218 is repeated until the base station manager receives an Ack signal. Similarly, the base station receives the uplink data retransmitted in step ST5218 (step ST5213), and repeats the processing of steps ST5212 to ST5215 until it transmits an Ack signal with no problem with the received data to the mobile terminal. To do.

[0259] Upon successful data transmission, the mobile terminal checks whether or not the "next DTX period end timing" calculated in step ST5207 is exceeded (step ST5220). If the next DTX period end timing is exceeded, the “next DTX period end timing” is extended by the “next DTX period” and the “next DTX period end timing” is set as the “next DTX period end timing”. Update (step S T5221). [0260] Alternatively, in step ST5204, the mobile terminal does not receive the "DTX cycle information" described so far from the base station, and receives the DTX cycle (if there are multiple cycles) of data or control signals generated in the uplink. When the “next DTX period end timing” is extended in step ST5221, the data is retransmitted according to the DTX cycle setting method described in steps ST5304 to ST5307 in FIG. 29. You can extend the “Next DTX period end timing” using the calculated “Next DT X cycle”! /.

As a result, in the first step ST5206, it is possible to effectively utilize radio resources that do not require transmission of information on the next and subsequent DTX periods using the L1ZL2 control signal.

[0261] On the other hand, when the base station succeeds in receiving data from the mobile terminal, it confirms whether or not the current timing exceeds the "next DTX period end timing" as with the mobile terminal. (Step ST5219), if the current timing exceeds the end timing of the next DTX period, the “next DTX period end timing” is extended by the “next DTX period” and the “next DTX period end timing” '' Is updated as `` Next DTX period end timing '' (step ST5222), and until this timing, the next DTX cycle is set in step ST5206, and this is set to the mobile terminal via the L1ZL2 control signal. Send to.

In step ST5222, the value of the “DTX cycle” used to extend the “next DTX period end timing”, which is the same as that on the mobile terminal side, is not the DTX cycle calculated in step ST5206. You can use the value calculated by recalculating the “Next DTX cycle” using the method described in steps ST5304 to ST5307 in Figure 29!

[0262] After updating the "next DTX period end timing" in step ST5221, the mobile terminal waits until the "next DTX period end timing".

While waiting until the “next DTX period end timing”, the base station receives the next DTX cycle in step ST5223. During this period (between steps ST5221 to ST5223) and between steps ST5223 to ST5224, the mobile terminal is desired to perform DTX operation (sleep) in order to reduce power consumption.

The mobile terminal repeats steps ST5207 to ST5223 after completing the DTX operation (wakes up) at the timing of step ST5224. [0263] FIGS. 31 and 32 are timing charts showing actual operations according to the DTX operation control sequence described in FIG.

Figure 31 shows the operation timing when data transmission occurs on the uplink in HARQ mode, and Figure 32 shows that data and control signals with two types of DTX periods are also generated on the uplink in HARQ mode. The operation timing is shown.

First, the operation timing when data transmission occurs in the uplink in the HARQ mode will be described with reference to FIG.

In FIG. 31, when transmission data (1) occurs, SR is transmitted to the base station on the uplink.

After receiving the SR, the base station notifies the mobile terminal of the uplink resource allocation information for data (1) and the DTX cycle (A) for data (1) via the downlink L1ZL2 control signal.

When receiving the uplink resource allocation information and the DTX cycle (A), the mobile terminal transmits (initial transmission) data (1) using the allocated uplink resource.

However, in the example of Fig. 31, the transmission (initial transmission) of data (1) failed, and the data was retransmitted three times (total four times, data was transmitted).

[0265] After the third retransmission of data (1), the reception at the base station is successful, an Ack signal is transmitted from the base station to the mobile terminal, and the mobile terminal receives the Ack signal.

At this point, since the “next DTX period end timing (timing when time A has passed from the initial transmission)” calculated from the DTX period (A) that has been notified first is already exceeded, the next DT X period ( A) The “next DTX period end timing (A + A timing)” that is extended for the next time is reset as the “next DTX end timing”, and the mobile terminal sleeps until this timing.

Meanwhile, in step ST5206, the base station sets a DTX cycle (DTX cycle (B)) and notifies the mobile terminal of the “next DTX cycle (B)” via the downlink L1ZL2 control signal. The mobile terminal receives the “next DTX cycle (B)”, wakes up, resets the “next DTX end timing”, transmits data (2), and receives an Ack signal from the base station. After that, scan until the next DTX end timing (= timing after initial transmission A + A + B of data (1)). Leave.

Next, an operation example when data and control signals having two types of DTX periods are generated in the uplink in the HARQ mode will be described with reference to FIG.

When data (1) occurs in the uplink, an SR is transmitted from the mobile terminal to the base station, and in response to this, resource allocation and DTX cycle (DTX cycle (A)) information are downlinked from the base station. To the mobile terminal via the L 1 ZL2 control signal.

The DTX cycle (A) notified at this time is determined by the same method as described for the DRX cycle setting in step ST5101 using FIG. That is, select the DTX period end timing closest to the current time from the DTX period a of data and the DTX period b of the sounding signal for upstream CQI measurement, and the DTX period end timing from the first transmission. This is the value calculated as the DTX cycle.

[0267] For example, in Fig. 32, when the DTX cycle a of the data and the DTX cycle b of the sounding signal are compared, the DTX cycle a of the data is closer because the data DTX cycle a is closer. The DTX cycle is a.

The mobile terminal in this DTX cycle (A) transmits the data (1) together with the sounding signal using the allocated resource, but cannot receive it well at the base station, and retransmits only the data (1) twice. Yes.

After the second retransmission, the reception at the base station is successful and the timing when the Ack signal is returned to the mobile terminal is the “DTX period end timing ( Data (1) at the time when time A has passed since the first transmission)), the base station and the mobile terminal both set the “DTX period end timing” to the next DTX cycle (A) (= data cycle a) Extend the time and reset the timing when 2 XA time has elapsed from the initial transmission of data (1) as the “D TX period end timing”.

[0268] Until this timing, the mobile terminal sleeps, the base station sets the next DTX cycle (B) in accordance with the WakeUp of the mobile terminal, and sets the next DTX cycle (B) via the L1ZL2 control signal. Notify the mobile terminal.

In calculating the DTX period (B), the next DTX period end timing (3 X a timing from the initial transmission of data (1)) by the data period a and the next sounding signal period b Compare the DTX period end timing (b timing from the first transmission of data (1)), select the DTX period b period end timing closer to the current timing, and the mobile terminal's WakeUp scheduled timing power will be If the period up to the end of period b is set as the DTX period (B), it goes through the following procedure.

[0269] In this example, it has been described that the calculation of the DTX cycle is performed when the DTX cycle is set on the base station side (step ST5206). However, the mobile terminal side receives the DTX cycle of each data, and step ST5207 Or you can set 'Calculate DTX period' in step ST5221! / ヽ.

[0270] In addition, when the DTX operation is performed during the DRX operation period and the start of the DTX cycle is set to the start of the DRX cycle as described in the second embodiment, the Active start timing of the DTX operation period is set to the current DRX cycle. Depending on the state of the uplink, it may vary depending on the state of the uplink, or whether priority is given to the transmission of uplink data or control signals that are currently generated and the start of the DRX cycle from the “next DTX cycle”. In either case, the DRXZDTX cycle setting and DRXZDTX control method described in Embodiment 8 can be used. In this case, the DTX cycle can be adjusted to the DRX cycle.

[0271] By setting the next DTX cycle in accordance with the WakeUp of the mobile terminal using the method described above, even if data and control signals with different DTX cycles exist, retransmission is possible in the H ARQ mode. A DTX control method that can minimize the frequency of the L1ZL2 control signal between the base station and the mobile terminal and reduce both processing loads even if it occurs beyond the period. Obtainable.

In addition, because DRXZDTX cycle setting and DRXZDTX control are performed according to certain rules, even if a sudden change in traffic occurs, the start of the DRXZDTX cycle can be predicted to some extent. Even when the start and cycle of the DTX are matched with the start and DRX cycle of the DRX cycle, the DTX cycle can be set without difficulty depending on the priority of data and control signals and the uplink status.

Furthermore, as Modification 1 of Embodiment 8, as shown in FIG. 33, while the mobile terminal is receiving data (1) in the previous DRX cycle, the DRX cycle (B ) Is received, and this DRX cycle (B) is sufficient to enter at least once within DRX period a of data (1). May be short.

In such a case, referring to the DRX control sequence diagram described in Fig. 27, when the previous DRX operation is completed (step ST5119 is Yes), the DRX cycle setting in the next step ST5101 is a new setting. It is necessary to set the “current DRX cycle” in consideration of both the DRX cycle (B) of the generated data (2) and the DRX cycle (A) of the existing data (1). Step In the setting of “Current DRX cycle” in ST5101, it is necessary to reset the DRX cycle by the DR XZDTX cycle setting method described with reference to FIG.

[0273] With the DRX cycle setting method described so far, the DRX period end timings in two different DRX cycles are compared, and the time from the start of the current DRX cycle to the closer end timing is reset as the DRX cycle If you do.

However, in this example, since the DRX cycle (B) is included in the DRX cycle, it is necessary to set the DRX cycle so that WakeUp can be performed at the beginning of the new DRX cycle (B). In other words, the DRX cycle must be set in the period C until the start of the DRX cycle (B).

After that, the DRX cycle may be updated according to the flow described in the flowchart of FIG. The DRX cycle setting in this modification can also be applied when a similar situation occurs in DTX control.

[0274] In addition, when data (2) with a new DRX cycle is generated during the DRX operation period of data (1), data (1) is being retransmitted by HARQ, and then retransmitted successfully. If the previous DRX cycle (A) has been exceeded, in step ST5116 in Fig. 27, the “next DRX period end timing” is set to the previous DRX cycle (A) by the method described above. The base station power is also notified to the mobile terminal side of the DRX cycle (B) of newly generated downlink data (2) via the L1ZL2 control signal during HARQ data retransmission. Step 27 ST5116 [Koh! Again, recalculate the DRX cycle using the method described in steps ST5304 to ST5307 in Fig. 29 and extend the next DRX engine end timing by the recalculated DRX cycle. Yo ...

[0275] As described above, if the DRXZDTX control method and DRXZ DTX cycle setting method described in the eighth embodiment are used, the DRXZDTX cycle in which retransmission is continuously set in the HARQ mode is used. Even if the period is exceeded, DRXZ DTX control can be performed without worrying about the number of retransmissions in HARQ, and the base station scheduling load can be reduced compared to the conventional technology. Can do.

Compared to Embodiment 7 above, since the base station does not need to transmit the L1ZL2 control signal to the mobile terminal during downlink transmission in the HARQ mode, the mobile terminal does not receive the L1ZL2 control signal. Transition to DRX operation can reduce the power consumption of mobile terminals.

[0276] Also, because DRXZDTX cycle setting and DRXZDTX control are performed according to certain rules, even when a sudden change in traffic occurs, the DRXZDTX Active timing can be predicted to some extent, so both the base station and the mobile terminal DRXZDTX control can be performed individually.For example, when DRX control in the downlink and DTX control in the uplink are mixed, the start of the DTX cycle in the DTX control is matched with the start of the DRX cycle in the DRX control! However, flexibly set the starting point of the DTX cycle and the DTX cycle itself to match the DRX cycle according to the uplink data, control signal priority, and HARQ retransmission status. Can do.

[0277] Furthermore, since DRXZDTX cycle setting and timing control according to certain rules can be performed, such control load can be distributed between the base station and the mobile terminal, and as a result, the scheduling load of the base station can be reduced. In addition, even when data that requires a new DRX operation occurs as in Variant 1 and the DRXZDTX cycle is short enough to be included in the DRXZD TX cycle of the previous data, the timing according to certain rules is used. It is possible to change the D RX cycle at both the base station and the mobile terminal individually, so that the DR XZDTX cycle due to the combination of multiple DRXZDTX cycles and the generation of new data There is an effect that it is possible to obtain a highly flexible DRXZDTX control method that can cope with changes. Further, by matching the DTX cycle to the DRX cycle, the same effect as in the second embodiment can be obtained.

[0278] Embodiment 9.

Non-Patent Document 8 shows a case where two DRX cycles are set. However, Non-Patent Document 8 does not consider the case where HARQ is applied. Therefore, as in the conventional method, it is notified by the L1ZL2 control signal together with the DRX periodic information power initial transmission data, or when it is notified at the time of radio bearer setup, or it is determined in advance. If the DRX cycle is exceeded, there will be a problem that it is not possible to shift to DRX operation.

Further, Non-Patent Document 8 shows a method for notifying DRX cycle change signals other than DRX cycle information. This method also has the above-mentioned problems. The ninth embodiment discloses a method in which the seventh embodiment and the eighth embodiment are combined in order to solve the above problems.

FIG. 34 is an explanatory diagram showing a case where two DRX cycles shown in Non-Patent Document 8 are set. In FIG. 34, the white lines represent downlink data and L1ZL2 control signals, and the hatched lines represent L1 ZL2 control signals.

The DRX cycle [1] is set longer than the DRX cycle [2]. The DRX cycle [1] is preliminarily determined and shared between the base station and the mobile terminal. The DRX cycle [2] Sent from the base station to the mobile terminal when the radio bearer is set up.

[0280] After the DRX cycle [1], the mobile terminal transitioning to DRX operation in the DRX cycle [1] performs reception processing, and receives downlink data if there is downlink data (in the figure). (See (1)). When there is no downlink data, the mobile terminal shifts to DRX operation in DRX cycle [2]. After the DRX cycle [2], the mobile terminal performs reception processing, and if there is downlink data, receives the downlink data (see (2) in the figure), and the next DRX cycle [2] Continue receiving downlink data until later (see (2) in the figure).

[0281] The mobile terminal receives the L1ZL2 control signal after the next DRX cycle [2], and when there is no downlink data, moves to the DRX operation of DRX cycle [2] ((3) in the figure). See).

Furthermore, after the DRX cycle [2], the mobile terminal performs reception processing, and if there is no downlink data, moves to the DRX operation of the DRX cycle [2] (see (4) in the figure). .

Then, the mobile terminal performs reception at the earlier timing after the DRX cycle [1] and the timing after the DRX cycle [2]. In Fig. 34, since the timing after DRX cycle [1] is early, downlink reception is performed at the timing after DRX cycle [1]. When there is no downlink data, the DRX operation of DRX cycle [1] is entered (see (5) in the figure). [0282] The conventional example shown in Non-Patent Document 8 does not consider the case where the force HARQ in which such a method is used is applied. Therefore, as shown in Fig. 34, if the L1ZL2 control signal and the last initial transmission data of DRX cycle information ^s (1) are used, the HARQ retransmission exceeds the DRX cycle [2]. There will be a problem that it becomes impossible to shift to DRX operation.

In addition, if retransmission due to HARQ occurs immediately before the DRX cycle [1] and exceeds the DRX cycle [1], there will be a problem that reception after the DRX cycle [1] becomes impossible.

[0283] Non-Patent Document 8 also describes a method for notifying DRX cycle change signals in addition to DRX cycle information. Even in such a method, the above-described problems occur.

The ninth embodiment discloses a method in which the seventh embodiment and the eighth embodiment are combined in order to solve the above problems.

FIG. 35 is an explanatory diagram showing an example of a method combining the seventh embodiment and the eighth embodiment when two DRX cycles are set.

The method disclosed in the seventh embodiment is applied for setting the DRX cycle [2], and the method disclosed in the eighth embodiment is applied for setting the DRX cycle [1].

In the downlink, white represents downlink initial transmission data or retransmission data and L1ZL2 control signal, horizontal line represents final downlink initial transmission data or retransmission data, and hatched line represents L1ZL2 control signal including DRX transition signal, The

In the uplink, white represents an uplink Ack signal ZNack signal for downlink initial transmission data or retransmission data, and hatched lines represent an Ack signal for downlink final initial transmission data or retransmission data.

[0285] When the base station transmits downlink data to the mobile terminal (see (1) in the figure) and transmits the final initial transmission data or retransmission data to the mobile terminal, it receives an Ack signal from the mobile terminal. After receiving the Ack signal, a DRX transition signal is transmitted to the mobile terminal using the first L1ZL2 control signal (see (2) in the figure).

When receiving the DRX transition signal from the base station, the mobile terminal transitions to DRX operation in the DRX cycle [2].

After the DRX cycle [2], the mobile terminal receives the L1ZL2 control signal and sends it to itself. When there is data, downlink data is received (see (3) in the figure).

After the DRX cycle [2], the L1ZL2 control signal is received, and if there is no data addressed to itself, the DRX cycle [2] starts again. These series of operations are repeated by the method described above.

[0286] Next, the base station transmits downlink data to the mobile terminal, and when transmission of downlink initial transmission data or retransmission data exceeds the timing after the DRX cycle [1] due to retransmission or the like (Fig. During,(

Continue to transmit downlink initial transmission data or retransmission data (see 4).

After receiving the Ack signal from the mobile terminal after transmitting the final initial transmission data or retransmission data to the mobile terminal, the base station transmits a DRX transition signal to the mobile terminal using the first L1ZL2 control signal after receiving the Ack signal ( (See (5) in the figure).

When the mobile terminal receives the DRX transition signal, the mobile terminal transitions to DRX operation in the DRX cycle [2].

. However, because the transmission of downlink initial transmission data or retransmission data has exceeded the timing after DRX cycle [1] due to retransmission (see (4) in the figure), DRX operation in DRX cycle [1] Priority is given to retransmission, etc. without entering, and DRX cycle [1] is extended and reset.

[0287] In this case, the base station and the mobile terminal may decide in advance to reset the DRX cycle [1] again. In addition, the base station may notify the information to be reset to the mobile terminal.

If the DRX cycle [1] is set again and there is no downlink initial transmission data or retransmission data from the base station to the mobile terminal at the timing after the next DRX cycle [1], the DRX operation in the DRX cycle [1] Migrate to

[0288] By using the method disclosed in the ninth embodiment, even when two DRX cycles are set, it becomes impossible to shift to DRX operation after the DRX cycle [2]. ] The effect that it becomes possible to solve the problem that later reception becomes impossible is obtained.

[0289] In the ninth embodiment, the method disclosed in the seventh embodiment is applied to the DRX cycle [2], and the method disclosed in the eighth embodiment is applied to the DRX cycle [1]. The method disclosed in the eighth embodiment may also be applied to the force DRX cycle [2] shown for what is applied. [0290] In the ninth embodiment, the force disclosed by the seventh embodiment and the eighth embodiment can be applied even when a plurality of DRX cycles are set with a force having two set DRX cycles. You can combine the methods disclosed in.

[0291] Embodiment 10.

In the ninth embodiment, the force shown for the combination of the method disclosed in the seventh embodiment and the method disclosed in the eighth embodiment when two DRX cycles are set. In the tenth embodiment, a combination of the method disclosed in the seventh embodiment and the conventional method will be described according to the relationship between the required time corresponding to the maximum (MAX) number of retransmissions of HARQ and the DRX cycle.

[0292] The base station transmits different DRX cycle information to the mobile terminal according to the following conditions:

The required time corresponding to the maximum (MAX) number of retransmissions of HARQ is Tmax, and the DRX cycle is TD RX.

(l) When Tmax ≥ TDRX

The base station applies the seventh embodiment.

In this case, the base station notifies the mobile terminal of the DRX cycle information using the L1ZL2 control signal after receiving the Ack signal.

In this case, when there is downlink data, the start timing of the DRX cycle is the transmission timing of the L1ZL2 control signal including the DRX cycle information transmitted to the mobile terminal after the base station receives the Ack signal from the mobile terminal. .

When there is no downlink data, the base station uses the transmission timing of the L1ZL2 control signal including the DRX cycle information transmitted to the mobile terminal.

The start timing of the DRX cycle may be the timing at which the base station transmits the L1ZL2 control signal when there is downlink data.

[0293] (2) When Tmax <TDRX

The base station applies a conventional method.

In this case, the base station uses the L1ZL2 control signal or in-band (Mach signaling, mapped to the MAC header, etc.) signal together with the initial transmission data as the DRX cycle information. Notify the mobile terminal.

In this case, the DRX cycle start timing is the transmission timing of the L1ZL2 control signal or inband signal that transmits the DRX cycle information together with the base station power initial transmission data, regardless of the presence or absence of downlink data.

However, Tmax may be determined by force, may be determined semi-statically, or may be determined dynamically.

[0294] FIG. 36 shows the relationship between the time required for the maximum (MAX) number of retransmissions of HARQ and the magnitude of the DRX cycle. It is a sequence diagram of a base station.

When downlink data is generated (step ST8101), the base station determines whether or not TDRX is satisfied (step ST8102).

[0295] When TDRX is larger than Tmax, the base station transmits DRX cycle information together with initial transmission data to the mobile terminal (step ST8103).

When receiving the initial transmission data from the base station (step ST8104), the mobile terminal determines whether or not the DRX cycle information is transmitted together with the initial transmission data (step ST8105).

When the DRX cycle has been sent, the mobile terminal uses the DRX cycle start timing as the initial transmission data reception timing (step ST8106) and enters the retransmission state by HARQ (ST 8107).

[0296] When the mobile terminal successfully receives the downlink data, it transmits an Ack signal to the base station and exits the retransmission state.

After transmitting the Ack signal, the mobile terminal shifts to DRX operation (step ST8108). After receiving the Ack signal from the mobile terminal, the base station exits the retransmission state and shifts to the DRX operation for mobile terminal A (step ST8109).

The mobile terminal and the base station transition to the active state after the DRX cycle (step ST8110

, ST8111).

[0297] When TDRX is equal to or lower than Tmax, the base station enters the retransmission state by HARQ without transmitting the DRX cycle information together with the initial transmission data (step ST8112). The mobile terminal determines whether or not DRX cycle information is transmitted together with the initial transmission data from the base station (step ST8105).

If the DRX cycle information is not transmitted, the mobile terminal enters a retransmission state by HARQ (step ST8112).

[0298] When the mobile terminal successfully receives the downlink data, it transmits an Ack signal to the base station and exits the retransmission state.

In addition, after transmitting the Ack signal, the mobile terminal shifts to DRX operation.

After receiving the Ack signal from the mobile terminal, the base station transmits DRX cycle information to the mobile terminal using the first L1ZL2 control signal (step ST8113).

When receiving the DRX periodic signal from the base station (step ST8114), the mobile terminal sets the DRX period start timing as the Ack signal transmission timing (step ST8115) and shifts to the DRX operation (step ST8116).

After transmitting the DRX cycle information to the mobile terminal (step ST8113), the base station shifts to the DRX operation for the mobile terminal A (step ST8117).

The mobile terminal and the base station shift to the active state after the DRX cycle (steps ST8118 and ST8119).

[0299] As described above, the method disclosed in Embodiment 7 above and the conventional method can be used depending on the magnitude relationship between the required time corresponding to the maximum (MAX) number of retransmissions of HARQ and the DRX cycle. When Tmax <TDRX, the DRX cycle can be transmitted with the same L1ZL2 control signal as the initial transmission data, and even if retransmission occurs thereafter, the base station does not need to change the time allocated after the DRX cycle. Therefore, the scheduler load can be reduced.

Furthermore, since it is known that the downlink data to the mobile terminal is generated immediately at the base station, the DRX cycle must be shortened, and the case where Tmax≥TDRX is also disclosed in Embodiment 7 above. By using this method, it is possible to avoid problems in retransmission.

[0300] Embodiment 11.

Let DTX cycle be CQI transmission cycle (cycle to transmit downlink channel quality measurement results) In this case, the DTX period may be determined in advance, or it may be equal to or greater than the DRX period.

In such a case, the timing for transmitting the uplink Ack signal ZNack signal for the downlink data may overlap with the CQI transmission timing.

If the Ack signal ZNack signal and the CQI signal are transmitted at the same time, the PAPR (Peak to Average Power Ratio) increases, which causes problems such as increased power consumption, decreased transmit power, and increased adjacent channel leakage power.

[0301] In order to solve such a problem, this Embodiment 11 discloses the following three methods when the timing for transmitting the uplink Ack signal ZNack signal and the CQI transmission timing overlap.

(a) Delay the CQI transmission timing

(b) Skip CQI transmission (Do not transmit CQI at overlapping timing)

(c) Delay the Ack / Nack signal transmission timing without changing the CQI transmission timing.

[0302] By using these methods, simultaneous transmission of the Ack signal ZNack signal and the CQI signal can be eliminated, and it is possible to shift to DTX operation. The following two methods are disclosed for the start timing of the DTX cycle.

(A) The CQI transmission timing determined by force

(B) Delayed CQI transmission timing

[0303] The following method is disclosed as a combination of the CQI transmission timing and the DTX cycle start timing.

The method (A) or (B) can be applied to the method (a).

Method (A) can be applied to method (b)

The method (A) can be applied to the method (c).

[0304] FIG. 37 is an explanatory diagram showing an example when the timing of transmitting the uplink Ack signal ZNack signal and the CQI transmission timing overlap.

Figure 37 (a) shows an example in which the CQI transmission timing is delayed by 1 TTI, and the start timing of the DTX cycle is set to a predetermined CQI transmission timing, and (b) skips CQI transmission. As an example of the start timing of the DTX cycle, the CQI transmission timing that has been decided in advance!

[0305] When the mobile terminal receives the downlink reference signal from the base station, it calculates the quality CQI of the downlink communication path from the reference signal, and transmits the CQI signal corresponding to the quality CQI to the base station. The transmission period (TCQI) of the CQI signal can be determined by force, or it can be equal to or greater than the DRX period.

On the other hand, when downlink data is transmitted from the base station in the downlink, the mobile terminal receives the downlink data and transmits an Ack signal ZNack signal to the base station according to the reception status of the downlink data.

[0306] Therefore, when the mobile terminal receives the downlink reference signal together with the base station power and the downlink data, the downlink reference signal power also calculates the quality CQI of the downlink channel, and transmits the CQI signal corresponding to the quality CQI to the base station. At the same time, an Ack signal ZNack signal is transmitted to the base station according to the reception status of the downlink data.

In this case, the transmission timing of the Ack signal / Nack signal and the transmission timing of the CQI signal overlap.

In such a case, in FIG. 37 (a), the CQI transmission timing is delayed by 1 TTI. As a result, the transmission timing of the Ack signal ZNack signal and the transmission timing of the CQI signal are transmitted without overlapping.

In this case, since the start timing of the DTX cycle is set to the CQI transmission timing determined in advance, the mobile terminal that transmitted the CQI transmits the DTX cycle until the next CQI transmission timing determined in advance. Can move to operation.

[0308] Also, in Fig. 37 (b), CQI transmission is skipped. Thus, the Ack signal Z Nack signal is transmitted without overlapping the transmission timing of the Ack signal ZN ack signal and the transmission timing of the CQI signal.

In this case, since the start timing of the DTX cycle is the CQI transmission timing determined in advance, the mobile terminal that transmitted the Ack signal ZNack signal until the next CQI transmission timing determined in advance. Transition to DTX operation.

[0309] Figure 38 shows that the timing of transmitting the uplink Ack signal ZNack signal overlaps with the CQI transmission timing. It is explanatory drawing which shows an example in the case of being connected.

Figure 38 (a) shows an example in which the CQI transmission timing is delayed by 1 TTI and the CQI transmission timing is delayed as the start timing of the DTX cycle.

[0310] When the mobile terminal receives the downlink reference signal from the base station, the mobile terminal calculates the quality CQI of the downlink communication path from the reference signal, and transmits the CQI signal corresponding to the quality CQI to the base station. The transmission period (TCQI) of the CQI signal can be determined by force, or it can be equal to or greater than the DRX period.

[0311] Therefore, when the mobile terminal receives the downlink reference signal together with the base station power and the downlink data, the downlink reference signal power also calculates the quality CQI of the downlink channel, and transmits the CQI signal corresponding to the quality CQI to the base station. At the same time, an Ack signal ZNack signal is transmitted to the base station according to the reception status of the downlink data.

[0312] In such a case, the CQI transmission timing should be delayed by 1mm. As a result, the transmission timing of the Ack signal ZNack signal and the transmission timing of the CQI signal are transmitted without overlapping.

In this case, since the start timing of the DTX cycle is the delayed CQI transmission timing, the mobile terminal that has transmitted the CQI can move to the DTX operation until the CQI transmission timing after the DTX cycle TCQI.

[0313] Since the simultaneous transmission of the Ack signal ZNack signal and the CQI signal is eliminated by using the method disclosed in the eleventh embodiment, PAPR increases, power consumption increases, transmission power decreases, and adjacent The occurrence of problems such as an increase in channel leakage power can be avoided.

Furthermore, by determining the start timing of the DTX cycle by the disclosed method, it is possible to shift to the DTX operation. [0314] Embodiment 12.

In Non-Patent Document 8, two DRX periods are set and shown! / However, the DRX operation method shown in Non-Patent Document 8 is problematic from the viewpoint of low power consumption of mobile terminals.

The problem of the DRX operation method of Non-Patent Document 8 will be described below with reference to FIG.

However, the DRX operation method of Non-Patent Document 8 has already been described in the ninth embodiment. Therefore, details are omitted.

[0315] The problem is that the mobile terminal operating in the DRX cycle [2], which is shorter than the DRX cycle [1], does not have data to be continuously received, but the DRX cycle [ Until 1] elapses, the L1ZL2 control signal must be received in the DRX cycle [2] (see (4) in Fig. 34).

The above problem is a problem in realizing low power consumption of the mobile terminal. In addition, when the difference between DRX cycle [1] and DRX cycle [2] is large, the above problem becomes more prominent.

[0316] In the twelfth embodiment, the above problem is solved by the following method.

The mobile terminal receives (monitors) the L1ZL2 control signal after the DRX cycle, and when there is data addressed to itself, the mobile terminal shifts to the DRX operation in the “DRX cycle equal to or less than the current DRX cycle”.

In addition, after the DRX cycle, the mobile terminal receives (monitors) the L1ZL2 control signal, and when there is no data addressed to itself, the mobile terminal shifts to DRX operation in the “DRX cycle longer than the current DRX cycle”. A DRX operation method is disclosed.

[0317] Hereinafter, a DRX operation method in the mobile communication system according to the twelfth embodiment will be described.

FIG. 39 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the twelfth embodiment of the present invention. In FIG. 39, the white lines indicate the downlink data, and the diagonal lines indicate the L1ZL2 control signal.

The relationship between the DRX period lengths is that the initial DRX period is longer than the DRX period [2]. ] Is longer than DRX cycle [3] DRX cycle [3] is shorter than DRX cycle [4] DRX cycle [4] is shorter than DRX cycle [5].

[0318] After the initial DRX cycle, the mobile terminal transitioning to the DRX operation in the initial DRX cycle performs reception processing of the L1 / L2 control signal, and if there is downlink data addressed to itself, receives the downlink data. (See (1) in Figure 39).

This L1ZL2 control signal includes the DRX cycle [2] as the “DRX cycle less than the current DRX cycle”.

[0319] The mobile terminal sets the received DRX cycle [2] as the DRX cycle.

When the reception processing of the L1ZL2 control signal is performed and downlink data continuously exists, the mobile terminal receives downlink data (see (2) in FIG. 39).

After the DRX cycle [2], the L1ZL2 control signal is received, and if there is downlink data addressed to itself, downlink data is received (see (3) in Fig. 39).

This L1ZL2 control signal includes a DRX cycle [3] as a “DRX cycle less than or equal to the current DRX cycle”, which is a shorter DRX cycle.

[0320] The mobile terminal sets the received DRX cycle [3] as the DRX cycle.

If there is no downlink data continuously after receiving the L1ZL2 control signal, the mobile terminal performs DRX operation according to the DRX cycle (DRX cycle [3]) (( See 4)).

In this example, the starting point of the DRX cycle [3] is the head of the subframe that includes the L1ZL2 control signal that reports the DRX cycle [3] (see Fig. 39). As another example, as the start point of the DRX cycle [3], as the beginning of a subframe containing an L1ZL2 control signal that has been confirmed that there is no continuous downlink data (see (4) in Fig. 39). reference).

[0321] After the DRX cycle [3], the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the operation shifts to the DRX operation (see (5) in Fig. 39).

This L1ZL2 control signal includes the DRX cycle [4] as the “DRX cycle longer than the current DRX cycle”. The DRX operation (5) in Fig. 39 is performed using this DRX cycle [4].

After the DRX cycle [4], the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the DRX operation is entered (see (6) in Fig. 39). This L1ZL2 control signal includes the DRX cycle [5] as a “DRX cycle longer than the current DRX cycle”, which is a longer DRX cycle. The DRX operation (6) in Fig. 39 is performed using this DRX cycle [5].

FIG. 40 is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to Embodiment 12 of the present invention.

The base station notifies the mobile terminal of the initial DRX cycle, and sets the initial DRX cycle as the DRX cycle of the mobile terminal (step ST4001).

The mobile terminal receives the initial DRX cycle from the base station, and sets the initial DRX cycle as the DRX cycle (step ST4002).

[0323] As an example of the initial DRX cycle notification method from the base station to the mobile terminal, the following method may be considered.

(1) When the radio bearer is set up, the base station notifies the mobile terminal using L3 signaling.

(2) At a dynamic timing, the base station notifies the mobile terminal using an L1ZL2 control signal or in-band signaling (MAC signaling).

(3) Set at the base station and mobile terminal as the default value (Static) of the mobile communication system.

[0324] As a specific example of the specified value, the maximum value of DRX cycle (for example, 5120 [TTI]) can be considered. When the specified value is used, there is no need to notify the base station power mobile terminal of the initial DRX cycle, so the effect of effective use of radio resources can be obtained. Also, since there is no need to notify the radio section, there is no mobile terminal reception error. For this reason, a different initial DRX cycle is set for the base station and the mobile terminal due to a reception error of the mobile terminal, and the mobile terminal cannot normally receive downlink data addressed to itself. It is possible to obtain a positive effect.

[0325] The base station and the mobile terminal shift to the DRX operation in the above DRX cycle (steps ST 4003 and ST4004).

Next, the base station determines whether or not the downlink data has been generated for the mobile terminal (step ST4005). [0326] First, the processing content when downlink data is generated will be described. If downlink data has occurred, the base station shifts to the process of step ST4006.

The base station notifies that there is downlink data for the mobile terminal using the L1ZL2 control signal after the DRX cycle (step ST4006). In other words, downlink data allocation (Allocation) is performed (see (1) in Fig. 39).

Then, the base station assigns downlink data to the mobile terminal, notifies the “DRX cycle less than or equal to the current DRX cycle”, and reports the notified “DRX cycle less than or equal to the current DRX cycle” to the mobile terminal. Set as DRX cycle (step ST4008). However, the processing of step ST4006 and step ST4008 may be simultaneous! /, And the order is arbitrary.

[0327] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step ST4007).

The mobile terminal receives the “DRX cycle equal to or less than the current DRX cycle” by the reception process of the L1ZL2 control signal (step ST4009).

The mobile terminal sets the received “DRX cycle less than or equal to the current DRX cycle” as the DRX cycle (step ST4010). See (1) in Figure 39.

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST4011).

If there is data addressed to itself, the process proceeds to step ST4013. However, the processing from step ST4007 to step ST4011 may be simultaneous! /, And the order is arbitrary.

[0328] The base station transmits downlink data to the mobile terminal using the radio resource allocated in step ST4006 (step ST4012).

The mobile terminal receives downlink data according to the radio resource allocated from the base station in step ST4007 (step ST4013).

[0329] The base station determines whether or not the next transmission timing (timing of the next resource block (RB)) exceeds the DRX cycle (step ST4014).

If the next transmission timing does not exceed the DRX cycle, the processing in step ST4016 Transition.

The base station determines whether data is continuously generated for the mobile terminal (step ST4016). If data is generated, the process proceeds to step ST4017.

The base station assigns downlink data to the mobile terminal using the continuous L1ZL2 control signal (step ST4017). See (2) in Figure 39.

[0330] The base station assigns downlink data to the mobile terminal using the continuous L1ZL2 control signal (step ST4017). See (2) in Figure 39.

In Step ST4012, the base station transmits downlink data according to the radio resource allocated in Step ST4017.

[0331] The mobile terminal determines whether or not the next reception timing (the timing of the next resource block) exceeds the DRX cycle (step ST4015).

If the next reception timing does not exceed the DRX cycle, the processing shifts to step ST4018.

The mobile terminal performs reception processing of the L1ZL2 control signal using the continuous L1ZL2 control signal (step ST4018).

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is data addressed to itself (step ST4019). If there is data addressed to itself, the process proceeds to step ST4013.

In step ST4013, the mobile terminal receives downlink data according to the radio resource allocated from the base station in step ST4018.

[0332] On the other hand, the base station determines whether or not the next transmission timing (timing of the next resource block) exceeds the DRX cycle (step ST4014).

If it is determined that the next transmission timing exceeds the DRX cycle, the process proceeds to step ST4005. See Fig. 39 (3).

The mobile terminal determines whether or not the next reception timing (the timing of the next resource block) exceeds the DRX cycle (step ST4015).

If the next reception timing exceeds the DRX cycle, the process proceeds to step ST4007. To do.

[0333] Also, the base station determines whether or not data for the mobile terminal is continuously generated! / (Step ST4016). If no data has been generated, the process proceeds to step ST4003, and DRX operation is performed in the “DRX cycle” (see (4) in FIG. 39).

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST4019).

If there is no data addressed to you, move to step ST4004 and perform DRX operation in “DRX cycle”.

[0334] Next, a case where downlink data is not generated will be described.

If no downlink data is generated, the base station proceeds to the process of step ST4020.

The base station does not notify the mobile terminal that there is downlink data using the L1ZL2 control signal after the DRX cycle (step ST4020). In other words, do not allocate downlink data (Allocation)! / (See (5) in Figure 39).

Alternatively, in step ST4020, the base station may notify that there is no downlink data for the mobile terminal using the L1ZL2 control signal after the DRX cycle. When the notification to the effect that there is no downlink data is sent, clear information is sent from the base station to the mobile terminal compared to the case where the notification to the effect that no downlink data exists! Therefore, it is possible to obtain the effect of reducing the occurrence of reception errors at the mobile terminal.

Next, the base station notifies the mobile terminal of the “DRX cycle longer than the current DRX cycle” by the L1ZL2 control signal after the DRX cycle, and the notified “DRX cycle longer than the current DRX cycle”. Set as the DRX cycle of the mobile terminal (step ST4021).

Thereafter, the process proceeds to step ST4003, and the DRX operation is performed in the “DRX cycle”. However, the processing of step ST4020 and step ST4021 may be simultaneous, and the order is arbitrary.

[0335] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step ST4007).

The mobile terminal uses the L1ZL2 control signal reception process X cycle "is received (step ST4009).

The mobile terminal sets the received “DRX cycle longer than the current DRX cycle” as the DRX cycle (step ST4010). See (5) in Figure 39.

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether there is data addressed to itself (step ST4011). Alternatively, it is determined whether or not a notification that there is no downlink data is received.

There is no data for me! If, or if a notification indicating that there is no downlink data is received, the process proceeds to step ST4004 and performs a DRX operation in the “DRX cycle”. However, the processing from step ST4007 to step ST4011 may be simultaneous, and the order is arbitrary.

[0336] In the above description, an example in which the "DRX cycle less than the current DRX cycle" and the "DRX cycle greater than the current DRX cycle" are notified by the L1ZL2 control signal in step ST4006 and step ST4020 is shown. However, it may be notified by an in-band signal (MAC signaling) that is not the L1ZL2 control signal.

Furthermore, when the radio bearer is set up, the DRX cycle set may be notified from the base station to the mobile terminal using L3 signaling.

[0337] Examples of DRX cycle sets include "DRX cycle A, DRX cycle B, DRX cycle C, DRX cycle D". The relationship of the cycles at this time is “DRX cycle A> DRX cycle B> DRX cycle C> D RX cycle D”.

As a trigger for changing the DRX cycle in this case, the L1ZL2 control signal after the DRX cycle shown in step ST4006 and step ST4020 can be considered.

[0338] Specifically, when it is notified by the L1ZL2 control signal that downlink data exists for the mobile terminal (step ST4006), or a change to a DRX cycle equal to or less than the current DRX cycle is notified. In this case, the base station and mobile terminal set a DRX cycle that is one shorter than the current DRX cycle. Specifically, if the current DRX cycle is DRX cycle B, DRX cycle C is set to the DRX cycle.

On the other hand, if it is not notified by the L1ZL2 control signal that there is downlink data for the mobile terminal (step ST4020), the downlink data for the mobile terminal If there is a notification that it does not exist or a change to a DRX cycle longer than the current DRX cycle is notified, the DRX cycle is set at the base station and mobile terminal by one longer than the current DRX cycle. . Specifically, when the current DRX cycle is DRX cycle B, DRX cycle A is set as the DRX cycle. By notifying the DRX cycle set when the radio bearer is set up, there is no need to notify the DRX cycle with the L1ZL2 control signal for each DRX cycle. Can do.

Furthermore, as a mobile communication system, the DRX cycle set is a specified value (Static) for base stations and mobile terminals! Set in a hurry! You can do it. A specific example of the DRX cycle set is the same as the case of notification at the time of radio bearer setup.

In addition, the trigger example for changing the DRX cycle is the same as that for notification at radio bearer setup.

When the specified value is used, there is no need to notify the base station power mobile terminal of the DRX cycle, so the effect of effective use of radio resources can be obtained. In addition, since there is no need to notify the radio section, there is no reception error of the mobile terminal. Therefore, due to the reception error of the mobile terminal, different DRX cycles are set in the base station and the mobile terminal, and the mobile terminal cannot normally receive the downlink data addressed to itself, and there is no problem. The effect can be obtained.

Also, in the above description, an example is shown in which the “DRX cycle less than the current DRX cycle” and the “DRX cycle greater than the current DRX cycle” are notified by the L1ZL2 control signal in steps ST4006 and ST4020. However, only the difference (“the newly set DRX cycle current DRX cycle”) may be notified. This makes it possible to reduce the amount of information (number of bits and number of symbols) when the DRX cycle is notified from the base station to the mobile terminal, and the effect of effective use of radio resources can be obtained. In addition, the method using the difference described above is a notification method from the base station in the DRX cycle ("DRX cycle less than current DRX cycle" "DRX cycle greater than current DRX cycle") to L1ZL2 control signal, in-band signal, It can be used regardless of L3 signaling, mobile communication system, etc.).

If there is no need to change the DRX cycle according to the traffic situation, it is possible not to notify the DRX cycle. As a result, more effective use of radio resources can be achieved. You can get fruits.

[0340] The following effects can be obtained by using the DRX operation method described above.

Generally, when there is data addressed to the mobile terminal, it indicates that the traffic addressed to the mobile terminal is high, and it is desirable to shorten the period during which the mobile terminal is not received. If there is no data addressed, it indicates that the traffic will be low, and the period during which the mobile terminal is not receiving may be extended.

With the DRX operation method disclosed in this Embodiment 12, the mobile communication system receives (monitors) the L1ZL2 control signal in the DRX cycle, and as a result, there is data addressed to the mobile terminal. If there is no data addressed to the mobile terminal, change the DRX cycle to “DRX cycle greater than or equal to the current DRX cycle”. Is possible.

Therefore, according to the twelfth embodiment, it is possible to obtain a DRX operation method capable of quickly changing the DRX cycle according to the traffic situation.

As a result, it is possible to obtain an effect that the mobile terminal can realize low power consumption according to the traffic situation. As an example of realizing low power consumption of a mobile terminal, the period during which the mobile terminal is considered to be able to turn off the power of the receiving system is shown as receiving system power supply example 1 and example 2 of the mobile terminal in FIG.

In addition, the DRX operation method shown in Embodiment 12 allows the base station in the DRX cycle to notify the mobile terminal ("DRX cycle less than current DRX cycle" and "DRX cycle greater than current DRX cycle"). It is characterized in that it can take many values as the DRX cycle regardless of the signal, in-band signal, L3 signaling, mobile communication system, etc.). As a result, it is possible to obtain the effect of being able to respond flexibly to traffic conditions.

[0342] In particular, when compared with the DRX operation method disclosed in Non-Patent Document 8, the following effects can be obtained.

The problem with Non-Patent Document 8 is that the L1ZL2 control signal is received in the DRX cycle [2] until the DRX cycle [1] elapses even though there is no data to be continuously received. (Refer to (4) in Fig. 34). In other words, there is a problem that the DRX cycle cannot be set quickly according to the traffic situation. That is, there is a problem that even if there is no data addressed to the mobile terminal, the DRX cycle cannot be quickly changed (lengthened).

[0343] In the DRX operation method disclosed in the twelfth embodiment, the L1ZL2 control signal is received (monitored) in the DRX cycle, and the DRX cycle is quickly changed according to the traffic status to the mobile terminal at that time. Therefore, the problem of Non-Patent Document 8 can be solved.

As a result, by using the DRX operation method disclosed in the twelfth embodiment, the DRX cycle can be quickly set according to the traffic situation, so even if the traffic is low, the DRX cycle is Because it is not possible to change (lengthen), there is no need to receive unnecessary L1ZL2 control signals generated, and the effect of realizing more efficient mobile terminal power consumption can be obtained. .

[0344] Modification 1 of Embodiment 12 will be described.

In Embodiment 12, any value can be set for “DRX cycle less than or equal to current DRX cycle” and “DRX cycle greater than or equal to current DRX cycle”. However, in Modification 1, the current DRX cycle can be set. Disclose a method to make the relationship between the DRX cycle newly set according to the cycle and traffic conditions constant.

A specific example of the relationship between the current DRX cycle and the newly set DRX cycle is shown below. (A) A method for defining a difference. A specific example of how to obtain a new DRX cycle is as follows.

"DRX period less than current DRX period" = "Current DRX period" + N

“DRX cycle greater than or equal to the current DRX cycle” = “Current DRX cycle” —N

(Ii) A method for defining the relationship between divisors and multiples. A specific example of how to obtain a new DRX cycle is as follows.

“DRX cycle less than current DRX cycle” = “Current DRX cycle” X 1 / N

“DRX cycle greater than or equal to current DRX cycle” = “Current DRX cycle” X N

In the following description, (i) a case where a relationship between a divisor and a multiple is specified will be described. FIG. 41 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the first modification. In Fig. 41, the white lines represent downlink data, and the hatched lines represent L1ZL2 control signals.

A mobile terminal that transitions to DRX operation in the initial DRX cycle ("x" in Fig. 41) performs L1ZL2 control signal reception processing after the initial DR X cycle, and if there is downlink data addressed to itself, Receives downlink data (see (1) in Fig. 41).

[0346] When there is data destined for the mobile terminal, this indicates that the traffic situation becomes high. Therefore, in order to shorten the period during which the mobile terminal is not receiving, the "current DRX cycle X 1ZN" is set. Set as new DRX cycle. Figure 41 shows an example of N = 2. Therefore, the value newly set as the DRX cycle is “xZ2”.

When the reception processing of the L1ZL2 control signal is performed and downlink data is continuously present, the mobile terminal receives downlink data (see (2) in FIG. 41).

After the DRX cycle (xZ2), the L1ZL2 control signal is received, and if there is downlink data addressed to itself, downlink data is received (see (3) in Fig. 41).

The mobile terminal “sets the current DRX cycle 1 as a new DRX cycle. Fig. 4 1 shows an example of N = 2. Therefore, the value newly set as the DRX cycle is“ x Z4 ”. It becomes.

[0347] When the reception processing of the L1ZL2 control signal is performed and there is no continuous downlink data, the mobile terminal performs the DRX operation in the DRX cycle (xZ4) (see (4) in Fig. 41). reference). In this example, the starting point of the DRX cycle is the beginning of the subframe that contains the L1ZL2 control signal after the DRX cycle (see Figure 41).

After the DRX cycle (xZ4), the L1ZL2 control signal reception process is performed, and if there is no downlink data addressed to itself, the operation shifts to the DRX operation (see (5) in Fig. 41).

[0348] The DRX cycle used in this DRX operation is set as follows.

If there is no downlink data when the L1ZL2 control signal reception process is performed, this indicates that the traffic situation will be low, so in order to lengthen the period during which the mobile terminal is not receiving, “Current DRX cycle XN” is set as the new DRX cycle. Figure 41 shows an example of N = 2. Therefore, the value newly set as the DRX cycle is “xZ2”. The

After the DRX cycle (xZ2), the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the DRX operation is entered (see (6) in Fig. 41). The DRX cycle used for this DRX operation is “x / 2 X 2 = x”, which is “x”.

FIG. 42 is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to the first modification. FIG. 42 is similar to FIG. 40, which is a sequence diagram showing an example of processing contents between the mobile terminal and the base station according to the twelfth embodiment. Since the same step number performs the same process, the description is omitted.

[0350] The base station notifies the mobile terminal of "N" indicating the maximum DRX cycle, the minimum DRX cycle, and the relationship between the current DRX cycle and the newly set DRX cycle (step ST4201).

The mobile terminal receives the maximum DRX cycle, the minimum DRX cycle, and “N” from the base station (step ST4202).

The maximum DRX cycle and the minimum DRX cycle notified to the base station power mobile terminal are newly necessary parameters in the first modification.

[0351] In Embodiment 12, the base station notifies the mobile terminal of a new DRX cycle every DRX cycle, or the DRX cycle set is notified from the base station to the mobile terminal in advance, or The example shows that the DRX cycle set is specified as a mobile communication system.

In contrast, in Modification 1, the base station does not explicitly notify the mobile terminal of a new DRX cycle, and the base station and the mobile terminal respectively have the “current DRX cycle” and “ “New DRX cycle” is set based on “N”. By setting the maximum DRX cycle and the minimum DRX cycle as parameters, it is possible to prevent the setting of a long DRX cycle outside the allowable range and a short DRX cycle outside the allowable range.

An example of the maximum DRX period is 5120 [TTI]. One example of the minimum DRX cycle is 1 [ΤΠ].

[0352] As an example of a method for notifying the maximum DRX cycle, the minimum DRX cycle, and "Ν" from the base station for this base station power mobile terminal, the following method can be considered.

(1) When the radio bearer is set up, the L3 signal line from the base station to the mobile terminal Notification using

(2) Set at the base station and mobile terminal as the default value (Static) of the mobile communication system.

When the specified value is used, there is no need to notify the base station and the mobile terminal of the maximum DRX cycle, the minimum DRX cycle, and “N”, so the effect of effective use of radio resources can be obtained. In addition, since there is no need to notify the radio section, there is no reception error of the mobile terminal. For this reason, the maximum DRX cycle, the minimum DRX cycle, and “N” are set from different base stations between the base station and the mobile terminal due to a reception error of the mobile terminal, and the mobile terminal cannot normally receive downlink data addressed to itself. It is possible to obtain the effect that no problem arises.

In addition, the maximum DRX cycle, minimum DRX cycle, and notification of “N” may be in the same order or different order.

As a method for notifying the “DRX cycle equal to or less than the current DRX cycle” and “DRX cycle equal to or greater than the current DRX cycle” described in Embodiment 12, when the radio bearer is set up, the base station When the DRX cycle set is notified to the mobile terminal, or when the DRX cycle set is set as a specified value in the base station and the mobile terminal as a mobile communication system, the above “maximum DRX cycle” and “minimum DRX” The “period” parameter can be used. As a result, even in the DRX cycle included in the DRX cycle set, the base station can notify the mobile terminal of the DRX cycle that can be set at that time. As a result, it is possible to obtain an effect that a more optimal DRX operation method can be realized according to the relationship with other mobile terminals, the sum of mobile terminals in the same cell, the traffic status of the mobile terminal, and the like. .

As a notification method, it may be necessary to be able to change it more quickly according to traffic conditions. Therefore, in addition to the above, a notification method using an L1ZL2 control signal, an in-band signal, etc. can be considered so that the mobile station can be notified more dynamically.

First, processing contents when downlink data is generated will be described.

When downlink data is generated, the base station moves to the process of step ST4006. The base station notifies that there is downlink data for the mobile terminal using the L1ZL2 control signal after the DRX cycle (step ST4006). In other words, downlink data allocation (Allocation) is performed (see (1) in Fig. 41).

Next, in setting a new DRX cycle, the base station calculates “DR X cycle, (DRX cycle, = DRX cycle X 1 / N)” as a provisional DRX cycle (step ST4203).

[0354] The base station determines whether or not the DRX cycle 'is smaller than the minimum DRX cycle notified to the mobile terminal in step ST4201! (Step ST4204).

If the DRX cycle is not smaller than the minimum DRX cycle, the process proceeds to step ST4205.

The base station sets the DRX cycle ′ as the DRX cycle (step ST4205). On the other hand, if the DRX cycle is smaller than the minimum DRX cycle, the processing shifts to step ST4206.

The base station discards the DRX cycle and does not change the DRX cycle (step ST4206). Alternatively, the minimum DRX cycle notified in step ST4201 may be set as the DRX cycle.

[0355] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step ST4007).

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST4011). If there is data addressed to itself, the process proceeds to step ST4211.

In setting a new DRX cycle, the mobile terminal calculates “DRX cycle, (DRX cycle, = DRX cycle X 1 / N)” as a provisional DRX cycle (step ST4211).

[0356] The mobile terminal determines whether the DRX cycle 'is smaller than the minimum DRX cycle received in step ST4202 (step ST4212).

If the DRX cycle is not smaller than the minimum DRX cycle, the processing shifts to step ST4213.

The mobile terminal sets the DRX cycle ′ as the DRX cycle (step ST4213). On the other hand, if the DRX cycle is smaller than the minimum DRX cycle, the processing in step ST4214 is performed. Transition.

The mobile terminal discards the DRX cycle and does not change the DRX cycle (step ST421 4). Alternatively, set the minimum DRX cycle received in step ST4202 as the DRX cycle.

[0357] In step ST4006, the base station transmits downlink data using the radio resource allocated to the mobile terminal (step ST4012).

In step ST4007, the mobile terminal receives downlink data according to the radio resource allocated from the base station (step ST4013).

[0358] Next, a case where downlink data is not generated will be described.

If no downlink data is generated, the base station proceeds to the processing of step ST4020. The base station notifies the mobile terminal that there is downlink data using an L1ZL2 control signal after the DRX cycle. No (step ST4020). In other words, the downlink data allocation (Allocation) is not performed! /, Or is notified that there is no downlink data for the mobile terminal (see (5) in FIG. 41).

Next, when setting a new DRX cycle, the base station calculates “DR X cycle, (DRX cycle, = DRX cycle X N)” as a provisional DRX cycle (step ST4207).

[0359] The base station determines whether the DRX cycle 'is greater than or equal to the maximum DRX cycle notified to the mobile terminal in step ST4201 (step ST4208).

If the DRX cycle is not greater than the maximum DRX cycle, the processing shifts to step ST4209.

The base station sets the DRX cycle ′ as the DRX cycle (step ST4209). On the other hand, if the DRX cycle is longer than the maximum DRX cycle, the processing shifts to step ST4210.

The base station discards the DRX cycle and does not change the DRX cycle (step ST4210). Alternatively, the maximum DRX cycle notified in step ST4201 may be set as the DRX cycle.

[0360] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step S). T4007).

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST4011). If there is no data addressed to the mobile terminal or if a notification indicating that there is no downstream data is received, the process proceeds to step ST4215.

In setting a new DRX cycle, the mobile terminal calculates “DRX cycle, (DRX cycle ′ = 01¾ cycle?”) As a provisional DRX cycle (step ST4215).

[0361] The mobile terminal determines whether the DRX cycle 'is greater than the maximum DRX cycle received in step ST4202 (step ST4216).

If the DRX cycle is not longer than the maximum DRX cycle, the processing shifts to step ST4217.

The mobile terminal sets the DRX cycle ′ as the DRX cycle (step ST4217). On the other hand, if the DRX cycle is longer than the maximum DRX cycle, the processing shifts to step ST4218.

The mobile terminal discards the DRX cycle and does not change the DRX cycle (step ST421 8). Alternatively, set the maximum DRX cycle received in step ST4202 as the DRX cycle.

[0362] By using the DRX operation method shown in Modification 1 above, the following effects can be obtained in addition to the effects of using Embodiment 12.

In Embodiment 12, with respect to “DRX cycle equal to or less than current DRX cycle” and “DRX cycle equal to or greater than current DRX cycle”, an arbitrary value is notified from the base station to the mobile terminal, whereas Modification 1 Then, only the relationship “N” between the DRX cycle newly set according to the current DRX cycle and traffic conditions is notified from the base station to the mobile terminal. As a result, the amount of information to be notified to the base station-powered mobile terminal is reduced, so that an effective use of radio resources can be obtained.

[0363] Furthermore, by using the above method (i) by defining the relationship between divisors and multiples based on the relationship between the current DRX cycle and the newly set DRX cycle, the set DRX cycle becomes the initial DRX cycle. "N to the nth power" times or "1ZN to the nth power" times. This allows the base station to It is possible to obtain an effect that a downlink resource to be allocated to the mobile terminal can be predicted. In addition, if there is a DRX cycle mismatch (state transition error) between the base station and the mobile terminal due to a reception error in the L1ZL2 control signal of the mobile terminal, the base station has one “longer DRX cycle”. If the mobile terminal is notified of the L1ZL2 control signal at, the mobile terminal can receive the L1ZL2 control signal, and the state transition error power can be recovered.

The DRX operation method when retransmission occurs when HARQ is applied is disclosed in two main ways in this specification.

The method shown in the seventh embodiment and the method shown in the eighth embodiment. In order to obtain the effect that the base station can predict the downlink resource allocated to the mobile terminal, the DRX operation method when HARQ is applied and retransmission occurs is the method described in Embodiment 8 above. Use increases the affinity.

In particular, when compared with the DRX operation method disclosed in Non-Patent Document 8, the following effects can be obtained.

By using the above-mentioned method (i) of the relationship between the divisor and the multiple in the relationship between the current DRX cycle and the newly set DRX cycle shown in Modification 1, the method of Non-Patent Document 8 can be used. In this way, there is an advantage that the L1ZL2 control signal reception operation that should be avoided in order to reduce the power consumption of the mobile terminal as shown in (4) of FIG. 34 does not occur. As a result, if a mobile communication system that is advantageous in terms of low power consumption of the mobile terminal as compared with Non-Patent Document 8 can be constructed, an effect can be obtained.

A second modification of the twelfth embodiment will be described.

In Embodiment 12, if the base station does not assign downlink data to the mobile terminal once with the L1ZL2 control signal after the DRX cycle, the base station will send a “DRX longer than the current DRX cycle” to the mobile terminal. Set Cycle. Also in the mobile terminal, if it is confirmed once by the L1ZL2 control signal after the DRX cycle that no downlink data is allocated, the “DRX cycle longer than the current DRX cycle” notified by the base station Set.

In Modification 2, if the base station does not continuously assign downlink data to the mobile terminal M times in the L1ZL2 control signal after the DRX cycle, the base station To set “DRX cycle longer than current DRX cycle”. Also in the mobile terminal, if the L1ZL2 control signal after the DRX cycle confirms that the downlink data is not allocated continuously M times, the mobile station notifies the base station of the “DRX cycle longer than the current DRX cycle”. "Is set.

FIG. 43 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the second modification. In Fig. 43, the white lines indicate downlink data, and the hatched lines indicate L1ZL2 control signals.

The DRX period length relationship is that the initial DRX period is longer than the DRX period [2] DRX period [2] is longer than the DRX period [3] DRX period [3] is shorter than the DRX period [4] DRX Period [4] is shorter than DRX period [5].

[0366] After the initial DRX cycle, the mobile terminal transitioning to the DRX operation in the initial DRX cycle performs reception processing of the L1 / L2 control signal, and if there is downlink data addressed to itself, receives the downlink data. (Refer to (1) in Fig. 43).

This L1ZL2 control signal includes the DRX cycle [2] as the “DRX cycle less than the current DRX cycle”. At the same time, “M (DRX cycle [2])” corresponding to the DRX cycle [2] is reported from the base station to the mobile terminal. The mobile terminal sets the received DRX cycle [2] as the DRX cycle.

[0367] When reception processing of the L1ZL2 control signal is performed and downlink data is continuously present, the mobile terminal receives downlink data (see (2) in Fig. 43).

After the DRX cycle [2], the L1ZL2 control signal is received, and if there is downlink data addressed to itself, downlink data is received (see (3) in Fig. 43).

This L1ZL2 control signal includes the DRX cycle [3] as the “DRX cycle below the current DRX cycle”. In addition, “M (DRX cycle [3])” corresponding to the DRX cycle [3] is reported from the base station to the mobile terminal.

In FIG. 43, description will be made assuming that “M (DRX cycle [3]) = 2”. The mobile terminal sets the received DRX cycle [3] as the DRX cycle.

[0368] When the reception processing of the L1ZL2 control signal is performed and there is no continuous downlink data, the mobile terminal performs the DRX operation according to the DRX cycle (DRX cycle [3]). See 4)).

In this example, the start point of the DRX cycle [3] is the beginning of the subframe that includes the L1ZL2 control signal that reports the DRX cycle [3] (see Fig. 43).

[0369] After the DRX cycle [3], the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the operation shifts to the DRX operation (see (5) in Fig. 43).

In this L1ZL2 control signal, the DRX cycle [4] may not be included as the “DRX cycle longer than the current DRX cycle”. However, since the L1ZL2 control signal after DRX cycle [3] has only been confirmed once that downlink data is not allocated, and since M (DRX cycle [3]) = 2, In (5) of 32, the mobile terminal does not set DRX cycle [4] as the DRX cycle. Therefore, DRX cycle remains DRX cycle [3].

After the DRX cycle [3], the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the DRX operation is entered (see (6) in Fig. 43). Since it was confirmed M times (M (DR X cycle 3) = 2) that the downlink data was not assigned by the L1 ZL2 control signal after DRX cycle [3], DRX cycle [4] was changed to DRX cycle [3]. Set as period.

FIG. 44 is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to the second modification. FIG. 44 is similar to FIG. 40 which is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to Embodiment 12 of the present invention. Since the same step number performs the same process, the explanation is omitted.

[0371] The processing contents when downstream data is generated will be described.

When downlink data is generated, the base station proceeds to the process of step ST4006. The base station notifies that there is downlink data for the mobile terminal using the L1ZL2 control signal after the DRX cycle (step ST4006). In other words, downlink data allocation (Allocation) is performed (see (1) in Fig. 43).

The base station assigns downlink data to the mobile terminal, notifies the DRX cycle not longer than the current DRX cycle, and notifies the DRX cycle not higher than the current DRX cycle to the DRX of the mobile terminal. Set as cycle (step ST4008).

The base station notifies the mobile terminal of “M” corresponding to the “DRX cycle equal to or less than the current DRX cycle” notified in step ST4408 (step ST4401). However, with step ST4006 The processing of step ST4008 and step ST4401 may be simultaneous! /, And the order is arbitrary, s (?

The definition of the parameter “M” is as follows.

This parameter adjusts the timing to change the current DRX cycle to a longer DRX cycle when the traffic situation is low and the frequency of downlink data destined for the mobile terminal decreases.

As a specific usage example, if the base station does not continuously assign downlink data to the mobile terminal M times in the L1ZL2 control signal after the DRX cycle, Set a DRX cycle greater than or equal to the DRX cycle. If the mobile terminal confirms that the downlink data is not allocated with the L1ZL2 control signal after the DRX cycle continuously M times, the base station will notify the “Current DRX cycle or longer” Set “DRX cycle”.

[0373] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step ST4007).

Next, the mobile terminal receives “M” from the base station (step ST4402).

The parameter “M” is a parameter newly provided in the second modification.

[0374] As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST4011). If there is data addressed to itself, the process proceeds to step ST4403.

The mobile terminal sets the DRX cycle received in step ST4009 as the DRX cycle (step ST4403). See Fig. 43 (1).

[0375] In step ST4006, the base station transmits downlink data using the radio resource allocated to the mobile terminal (step ST4012).

[0376] Next, the case where downlink data is generated will be described. If no downlink data is generated, the base station proceeds to the processing of step ST4020. The base station notifies the mobile terminal that there is downlink data using an L1ZL2 control signal after the DRX cycle. No (step ST4020). In other words, do not allocate downlink data (Allocation)! / ヽ (see (5) in Fig. 43).

[0377] The base station notifies the mobile terminal of the "DRX cycle longer than the current DRX cycle" by the L1ZL2 control signal after the DRX cycle (step ST4021).

The base station uses the L1ZL2 control signal after the DRX cycle to determine whether the downlink data allocation to the mobile terminal has occurred M times (“M” corresponding to the current DRX cycle). (Step ST4404). If the number of times the mobile terminal is not assigned is less than M times, the process moves to the process of step ST4003 without changing the DRX cycle and performs the DRX operation (see (5) in Fig. 43).

On the other hand, when the number of times that the mobile terminal is not assigned becomes M times, the process proceeds to step ST4405 (see (6) in FIG. 43).

The base station sets the notified “DRX cycle longer than the current DRX cycle” as the DRX cycle of the mobile terminal (step ST4405). Thereafter, the process proceeds to step ST4003, and DRX operation is performed (see (6) in FIG. 43).

[0378] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step ST4007).

The mobile terminal receives the “DRX cycle longer than the current DRX cycle” by the reception process of the L1ZL2 control signal (step ST4009).

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST4011). If there is no data addressed to itself, the process proceeds to step ST4406.

[0379] The mobile terminal uses the L1ZL2 control signal after the DRX cycle to continuously confirm that the downlink data is not allocated to the mobile terminal M times ("M" corresponding to the current DRX cycle). Judgment is made (step ST4406). If the number of confirmations that there is no assignment is less than M times, the process proceeds to step ST4004 without changing the DRX cycle. Performs RX operation (see (5) in Figure 43).

On the other hand, when the number of times of confirming that there is no allocation is M times, the process proceeds to step ST4407 (see (6) in FIG. 43).

The mobile terminal sets the received “DRX cycle longer than the current DRX cycle” as the DRX cycle (step ST4407). After that, the process proceeds to step ST4004 and DRX operation is performed (see (6) in Fig. 43).

[0380] In the above description, an example has been shown in which “M” is notified by the L1ZL2 control signal in step ST4401, but in-band signal (MAC signaling) is associated with the corresponding DRX cycle that is not in the L1ZL2 control signal. Let me know.

Furthermore, when the radio bearer is set up, the base station may notify the mobile terminal of “M set” in association with the DRX cycle set notified using L3 signaling. Alternatively, “M” corresponding to all DRX cycles may be notified. When the radio bearer is set up, the DRX cycle is notified by notifying “M set” in relation to the DRX cycle set. Since it is not necessary to notify “M” when “DRX cycle equal to or less than current DRX cycle” is notified by each L1ZL2 control signal, it is possible to effectively use radio resources. .

[0381] Furthermore, “M set” may be set as a specified value (Static) in the base station and the mobile terminal in association with the DRX cycle set specified as the mobile communication system. Or you can set “M” for all DRX cycles!

If the specified value is used, there is no need to notify the base station power mobile terminal of the DRX cycle, so the effect of effective utilization of radio resources can be obtained.

In addition, since there is no need to notify the wireless section, no reception error of the mobile terminal occurs. For this reason, the DRX cycle is set differently between the base station and the mobile terminal due to the reception error of the mobile terminal, and the mobile terminal cannot normally receive the downlink data addressed to itself. Obtainable.

[0382] By using the DRX operation method shown in Modification 2 above, the following effects can be obtained in addition to the effects of using Embodiment 12. In Embodiment 12, if the base station does not assign downlink data to the mobile terminal once with the L1ZL2 control signal after the DRX cycle, the base station will send a “DRX longer than the current DRX cycle” to the mobile terminal. Set Cycle. Also in the mobile terminal, if it is confirmed once by the L1ZL2 control signal after the DRX cycle that no downlink data is allocated, the “DRX cycle longer than the current DRX cycle” notified by the base station Set.

[0383] In the second modification, if the base station does not continuously generate downlink data allocation to the mobile terminal M times in the L1ZL2 control signal after the DRX cycle, Set a DRX cycle greater than or equal to the current DRX cycle. Also in the mobile terminal, if the L1ZL2 control signal after the DRX cycle confirms that the downlink data is not allocated continuously M times, the mobile station notifies the base station of the “DRX cycle longer than the current DRX cycle”. "Is set.

As a result, when the downlink data allocation is ineffective, it is necessary to adjust the period for checking whether the traffic situation is really low, rather than quickly shifting to the “DRX cycle longer than the current DRX cycle”. Is possible. It is possible to change the number of times to confirm that there is no downlink data allocation.

As a result, it is possible to effectively adjust the downlink throughput and the reduction in power consumption of the mobile terminal.

[0384] Modification 3 of Embodiment 12 will be described.

Modified example 3 shows an example of an optimum method when the modified examples 1 and 2 are used in combination. Specifically, the parameter “N” in Modification 1 and the parameter “M” in Modification 2 are set to the same value.

FIG. 45 is an explanatory diagram showing an example of a DRX operation method in the mobile communication system according to the third modification. In FIG. 45, the white lines represent downlink data, and the hatched lines represent L1ZL2 control signals.

A mobile terminal that transitions to DRX operation in the initial DRX cycle ("x" in Fig. 45) performs L1ZL2 control signal reception processing after the initial DR X cycle, and if there is downlink data addressed to itself, Receives downlink data (see (1) in Fig. 45).

If there is data addressed to the mobile terminal, this indicates that the traffic situation will be high. Therefore, “current DRX cycle X 1ZN” is set as a new DRX cycle in order to shorten the period during which no mobile terminal is received. Figure 45 shows an example of N = 2. Therefore, the value newly set as the DRX cycle is “xZ2”.

When the reception processing of the L1ZL2 control signal is performed and downlink data is continuously present, the mobile terminal receives downlink data (see (2) in FIG. 45).

[0386] After the DRX cycle (xZ2), the L1ZL2 control signal is received, and if there is downlink data addressed to itself, downlink data is received (see (3) in Fig. 45).

The mobile terminal “sets the current DRX cycle 1 as the new DRX cycle. Figure 4 5 shows an example of N = 2. Therefore, the value set as the new DRX cycle is“ x Z4 ”. It becomes.

When the L1ZL2 control signal reception process is executed and there is no continuous downlink data !, the mobile terminal performs DRX operation with DRX cycle = xZ4 (see (4) in Fig. 45). ). In this example, the start point of the DRX cycle is the beginning of the subframe that contains the L1ZL2 control signal after the DRX cycle (see Figure 45).

[0387] After the DRX cycle (xZ4), the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the DRX operation is entered (see (5) in Fig. 45). In the L1ZL2 control signal after DRX cycle = xZ4, it has only been confirmed once that downlink data allocation is not performed, and since “M = N = 2”, in (5) of FIG. The terminal does not change the DRX cycle.

After the DRX cycle (xZ4), the L1ZL2 control signal is received, and if there is no downlink data addressed to itself, the DRX operation is entered (see (6) in Fig. 45). In the L1ZL2 control signal after DRX cycle = xZ4, it was confirmed twice that no downlink data was allocated ((5) (6) in Fig. 45). Changes the DRX cycle. D RX period is `` x / 4 X

It is.

[0388] The sequence diagram showing an example of the processing contents of the mobile terminal and the base station according to Modification 3 uses FIG. 42, which is the sequence of Modification 1, and FIG. 44, which is the sequence of Modification 2. be able to. Therefore, the description is omitted.

By using the DRX operation method shown in Modification 3 above, Embodiment 12 and Modification 1 In addition to the effects obtained by using the modified example 2, the following effects can be obtained. By setting the parameter “N” in Modification 1 and the parameter “M” in Modification 2 to the same value, the mobile terminal will always monitor the L1ZL2 control signal in one “longer DRX cycle” ( (See (6) (7) in Figure 45).

[0389] As a result, when there is a DRX cycle mismatch (state transition error) between the base station and the mobile terminal due to a reception error of the L1ZL2 control signal of the mobile terminal, the base station If the L1ZL2 control signal is notified to the mobile terminal in the `` long DRX cycle '' or the initial DRX cycle, the mobile terminal can receive the L1ZL2 control signal and recover from the state transition error! /, The effect is obtained.

The method shown in the seventh embodiment and the method shown in the eighth embodiment. In order to obtain the effect of the third modification, the DRX operation method when HARQ is applied and retransmission occurs increases the affinity by using the method described in the eighth embodiment. In particular, when compared with the DRX operation method disclosed in Non-Patent Document 8, the following effects can be obtained.

In Modification 3, since the method of making the relationship between the current DRX cycle and the newly set DRX cycle constant according to the traffic situation is used, as in the method of Non-Patent Document 8, as shown in FIG. There is an advantage that an extra L1ZL2 control signal receiving operation as in (4) does not occur. As a result, it is possible to obtain an effect that it is possible to construct a mobile communication system that is advantageous for low power consumption of the mobile terminal as compared with Non-Patent Document 8.

[0390] Modification 4 of Embodiment 12 will be described.

In the twelfth embodiment, in the fourth modification example showing the method of notifying the mobile terminal of the “initial DRX cycle”, a method for setting the initial DRX cycle according to the QoS of the service is disclosed.

[0391] The processing contents of the mobile terminal and the base station are similar to FIG. 40, which is a sequence diagram showing an example of the processing contents of the mobile terminal and the base station according to the twelfth embodiment. For this reason, the following description will focus on the different parts using FIG. In step ST4001, the initial DRX cycle is not notified to the base station power mobile terminal.

Instead, when the radio station is set up at the base station, depending on the QoS of the service notified to the mobile terminal of the base station (for example, according to Example 1 in Fig. 46), the initial DRX Select the cycle and set it as the DRX cycle.

In addition, in step ST4002, instead of receiving the initial DRX cycle, the mobile terminal selects the initial DRX cycle according to the QoS of the service notified of the base station power (for example, according to Example 1 in FIG. 46). And set as DRX cycle.

[0392] Example 1 in Fig. 46 shows an example of the relationship between the QoS of the service and the initial DRX cycle.

QoS classification is not limited to Example 1 in Figure 46. As another example, the initial DRX cycle may be related depending on the service provided.

In addition, as shown in Example 1 of FIG. 46, the DRX cycle is not limited to the designation of the TTI unit, but may be a time unit [ms], a subframe unit, or the like.

In addition, the relationship between the QoS of the service and the initial DRX cycle may be defined as a mobile communication system, or may be notified from the base station to the mobile terminal. When multi-service is realized in the mobile communication system, select the initial DRX cycle corresponding to the highest QoS among the services provided by the base station and mobile terminal, and set it as the DRX cycle. You may do it.

Furthermore, as shown in Example 2 of FIG. 46, the maximum DRX cycle may be set according to the QoS of the service. Alternatively, set the minimum DRX cycle according to the QoS of the service.

This Modification 4 can also be applied to Modification 1, Modification 2, and Modification 3.

[0393] By using the DRX operation method shown in Modification 4 above, in addition to the effects of using Embodiment 12, Modification 1, Modification 2 and Modification 3, the following effects can be obtained. it can.

Even when downlink data for the mobile terminal is generated at the base station, downlink data cannot be transmitted to the mobile terminal if the mobile terminal is in DRX operation. Therefore, setting a long DRX cycle can reduce the power consumption of the mobile terminal, but it also has the disadvantage of reducing the downlink throughput. In other words, when the service QoS is highly required, the DRX operation can be performed as a mobile communication system while satisfying the service QoS by setting the initial DRX cycle or the maximum DRX cycle short. It becomes possible.

[0394] By using Modified Example 4, the initial DRX cycle, the maximum DRX cycle, or the initial DRX cycle and the maximum DRX cycle can be optimized according to the QoS of the service without notifying the mobile terminal from the base station. It is possible to realize D RX operation using the DRX cycle or the optimum maximum DRX cycle.

As a result, it is possible to perform an optimal DRX operation that leads to lower power consumption of the mobile terminal while satisfying the QoS of the service.

In addition, since there is no need to notify the mobile station of the initial DRX cycle, or the maximum DRX cycle, or the initial DRX cycle and the maximum DRX cycle, it is necessary to effectively use radio resources. Can also be effective.

[0395] Embodiment 13.

Non-Patent Document 9 describes Time Division Multiplexing (TDM) as a data transmission method other than E-MBMS (Evolved Multimedia Broadcast Multicast Service) and E-MBMS (non-MBMS, non-EMBMS). ) Is disclosed.

FIG. 47 is an explanatory diagram showing an example of allocation of radio resources other than E-MBMS and E-MBMS. The unit of time division is described in subframe units as an example.

[0396] Non-Patent Document 10 discloses that only the first one symbol or only the first two symbols in the subframe assigned to E-MBMS by time division multiplexing (TDM) is used in the Unicast service. !

FIG. 48 shows an example of radio resource allocation. The example shows that only the first symbol in the subframe allocated to E-MBMS (see (1) in Fig. 48) is used in the Unicast service. Non-Patent Documents 9 and 10 do not describe anything about DRX operation (DRX operation during Active).

[0397] E-MBMS and data other than E-MBMS are time-division multiplexed, and only the first symbol or only a few symbols in the subframe allocated to E-MBMS can be used in the Unic ast service. Then, the following issues arise in relation to the DRX operation (Active DRX operation).

The problem of the thirteenth embodiment will be described with reference to FIG.

[0398] The mobile terminal performs DRX operation in the DRX cycle (X). The mobile terminal receives (monitors) the L1ZL2 control signal every DR X cycle (see (1) and (2) in Fig. 49). If there is downlink data addressed to itself as a result of reception processing of the L1ZL2 control signal, the downlink data is received by the radio resource allocated by the L1ZL2 control signal.

The radio resource allocated by the L1ZL2 control signal in dynamic scheduling is within the same subframe as the subframe including the L1ZL2 control signal on the time axis.

On the other hand, if there is no downlink data addressed to itself as a result of receiving the L1ZL2 control signal, the DRX operation is performed in the DRX cycle (see (1) in FIG. 49).

[0399] E-MBMS transmission period, in other words, E- MBMS data is time-division multiplexed, and the timing that becomes active (see Figure 15) during DRX operation overlaps the following. Problems occur.

E The symbol that can be used for Unicast service within the subframe assigned to MBMS is only the first symbol or only the first two symbols. E—Assigned to MBMS, the L1ZL2 control signal in the subframe Is less than the number of symbols assigned to (first 1 symbol, first 2 symbols, or first 3 symbols). Therefore, it is assumed that the mobile terminal performing DRX operation monitors the L1ZL2 control signal at the timing when the E-MBMS transmission period overlaps with the Active (see Fig. 15) timing during the DR X operation period. However, it may not be possible to determine whether or not the L1ZL2 control signal has the data addressed to it.

[0400] Hereinafter, the operation of the E-MBMS as a mobile communication system in the thirteenth embodiment and And how to operate DRX.

FIG. 50 is an explanatory diagram showing an example of the operation of the E-MBMS and the DRX operation method in the mobile communication system according to the thirteenth embodiment of the present invention.

In FIG. 50, the white lines represent the Unicast downlink data, the right-upward diagonal lines represent the L1 / L2 control signal, and the right-downward diagonal lines represent the E-MBMS data.

[0401] The mobile terminal performs DRX operation in the DRX cycle (X). The mobile terminal receives (monitors) the L1ZL2 control signal every DR X cycle (see (1) in FIG. 50).

If there is downlink data addressed to itself as a result of the reception processing of the L1ZL2 control signal, the downlink data is received by the radio resource allocated by the L1Z L2 control signal.

On the other hand, if there is no downlink data addressed to itself as a result of receiving the L1ZL2 control signal, the DRX operation is performed in the DRX cycle (see (1) in FIG. 50).

[0402] The mobile terminal transmits a period in which E-MBMS is transmitted, in other words, a period in which E-MBMS data is time-division multiplexed, and a period that becomes Active during DRX operation (see Fig. 15). When imming overlaps (see (2) in Fig. 50), do not perform L1ZL2 control signal reception in DRX operation (skip).

The mobile terminal in the DRX operation performs the reception operation of the L1ZL2 control signal in the DRX operation in the subframe (see (3) in Fig. 50) next to the cycle in which E-MBMS is transmitted.

[0403] E—When L1ZL2 control signal of the next subframe of the cycle in which MBMS is transmitted is allocated to downlink transmission of the mobile terminal, the downlink data is transmitted according to the allocation in the same subframe. Data is transmitted and received (see (4) in Fig. 50).

In addition, if the E-MBMS transmission cycle does not overlap with the Active timing during the DRX operation period (the reception timing of the L1ZL2 control signal during the DRX operation period), skip is not performed during the D RX operation. The L1ZL2 control signal is received at the same timing as when it is applied (see (5) in Fig. 50). [0404] FIG. 51 is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to Embodiment 13 of the present invention.

The base station notifies the mobile terminal of the E—MBMS transmission cycle and the start of the E—MBMS transmission cycle (Starting Point) (step ST6101). It is conceivable that the start is notified by the frame number, subframe number, slot number, symbol number, etc.

Normally, notification of the beginning of the E—MBMS transmission cycle and the beginning of the E—MBMS transmission cycle only needs to be received by the mobile terminal receiving the E—MBMS service. However, in this Embodiment 13, in step ST6101, the E-MBMS service transmission information (E-MBMS transmission cycle, E-MBMS transmission cycle start) is received to receive the E-MBMS service. It is characterized in that all mobile terminals under the base station receive it as well as terminals or mobile terminals that have the ability to receive E-MBMS services.

This is because even a mobile terminal that receives an E-MBMS service or a mobile terminal other than a mobile terminal that has the ability to receive an E-MBMS service may perform DR X operation during Active. is there. For this reason as well, it is conceivable that BCH (Broadcast Channel), which is a channel for transmitting broadcast information, is used for the above notification.

[0405] The mobile terminal receives the E-MBMS transmission cycle and the start of the E-MBMS transmission cycle from the base station (step ST6102).

In a mobile communication system in which a mobile terminal that does not perform DRX operation during Active or a mobile terminal that does not have the capability to perform DRX operation during Active is allowed, all mobile terminals under the base station are EMBMS. The mobile terminal that does not receive service transmission information but does not perform DRX operation during Active, or that does not have the capability to perform DRX operation during Active, should be E-MBMS. It may be assumed that the transmission information of the service is not received.

[0406] The base station and the mobile terminal shift to the DRX operation in the DRX cycle (step ST6103, step ST6104).

The base station determines whether or not downlink data has been generated for the mobile terminal (step ST6105). [0407] First, processing contents when downlink data is generated will be described.

When downlink data is generated, the base station proceeds to the process of step ST6106.

The base station determines whether or not the transmission timing of the L1ZL2 control signal during the DRX operation period for the mobile terminal overlaps with the E-MBMS transmission timing (step ST6106). When the transmission timing of the L1ZL2 control signal overlaps with the transmission timing of E-MBMS, the process proceeds to step ST6111.

The base station does not perform transmission at the transmission timing of the L1ZL2 control signal in normal DRX operation (see (2) in Fig. 50)! / ヽ (Skip) (Step ST6111). In the next subframe of the transmission timing of the L1ZL2 control signal in normal DRX operation (see (3) in Fig. 50), the L1ZL2 control signal is transmitted in the DRX operation for the mobile terminal.

[0408] The mobile terminal determines whether the reception timing of the L1ZL2 control signal during the DRX operation period overlaps with the E-MBMS transmission timing (step ST6107).

When the reception timing of the L1ZL2 control signal overlaps with the transmission timing of E-MBMS, the process proceeds to step ST6112.

The mobile terminal does not perform the reception operation (skip) at the reception timing of the L1ZL2 control signal in the normal DRX operation (see (2) in Fig. 50) (step ST6112). In the next subframe (see (3) in Figure 50) of the reception timing of the L1ZL2 control signal in the normal DRX operation, receive the L1ZL2 control signal in the DRX operation.

[0409] The base station transmits downlink data using the radio resource allocated to the mobile terminal in step ST6111 or step ST6108 (step ST6113). As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST6110). If there is data addressed to itself, the process proceeds to step ST6114.

The mobile terminal receives downlink data according to the radio resources allocated by the base station in step ST6112 or step ST6109 (step ST6114). [0410] The base station determines whether or not the transmission timing of the L1ZL2 control signal during the DRX operation period for the mobile terminal overlaps with the E-MBMS transmission timing (step ST6106).

If the transmission timing of the L1ZL2 control signal does not overlap with the transmission timing of E-MBMS, the process shifts to step ST6108.

The base station performs transmission operation at the transmission timing of the L1ZL2 control signal in normal DRX operation (step ST6108). Then, the process proceeds to step ST6113. The mobile terminal performs reception operation at the reception timing of the L1ZL2 control signal in normal DRX operation (step ST5109). Then, the process proceeds to step ST6114.

[0411] Next, a case where downlink data is not generated will be described.

If no downlink data is generated, the base station moves to the process of step ST6103 (step ST6105).

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal determines whether or not there is power for the data addressed to itself (step ST6110). If there is no data addressed to itself, the process proceeds to step ST6104.

[0412] According to the thirteenth embodiment, the following effects can be obtained.

It is possible to obtain an effect that the E-MBMS service and the Unicast service can be provided without any information newly transmitted / received between the base station and the mobile terminal.

In order to solve the problem of the thirteenth embodiment, it is possible to provide new information to be transmitted / received between the base station and the mobile terminal so as to effectively use radio resources. If possible, this is an effective solution.

[0413] Modification 1 of Embodiment 13 will be described.

In the thirteenth embodiment, when the cycle of E-MBMS transmission and the timing of becoming active during the DRX operation overlap, the problem is solved by not performing the transmission / reception operation of the L1ZL2 control signal in the DRX operation. And

In the first modification, the mobile terminal detects that the period when E-MBMS is transmitted overlaps with the timing that becomes Active (see Fig. 15) during the DRX operation (see (2) in Fig. 50). In addition, the L1ZL2 control signal in the DRX operation is transmitted and received in the DRX cycle using the first symbol or several symbols that can be used in the Unicast service. This causes the following new problem.

The part other than the symbols that can be used for Unicast service in the subframe allocated to E MBMS is used by E-MBMS and cannot be used in Unicast service. Therefore, the L1 ZL2 control signal transmitted from the base station to the mobile terminal using the symbols available for the Unicast service in the subframe allocated to E-MBMS is used to transmit downlink data to the mobile terminal. When allocation is performed, a problem arises that collision between EMBMS data and Unicast data occurs (see (3) in Fig. 49).

In this modified example 1, when the E-MBMS transmission period overlaps with the Active timing during the DRX operation period, the actual downlink data is assigned when the downlink data is assigned by the L1ZL2 control signal. This problem is solved by performing the allocation in the next subframe (or after the specified subframe as the mobile communication system or after the subframe notified from the base station to the mobile terminal).

With reference to FIG. 50, an example of the operation of the E-MBMS as a mobile communication system according to the first modification and the DRX operation method will be described. In FIG. 50, the white outline represents the Unicast downlink data, the right upward diagonal line represents the L1ZL2 control signal, and the right downward diagonal line represents the E-MBMS data.

The mobile terminal is performing DRX operation in DRX cycle (X). The mobile terminal receives (monitors) the L1ZL2 control signal every DR X cycle (see (1) in FIG. 50).

On the other hand, if there is no downlink data addressed to itself as a result of receiving the L1ZL2 control signal, the DRX operation is performed in the DRX cycle (see (1) in FIG. 50). [0415] The mobile terminal transmits a period in which E-MBMS is transmitted, in other words, a period in which E-MBMS data is time-division multiplexed, and a period that becomes Active during the DRX operation period (see FIG. 15). When imming overlaps (see (2) in Fig. 50), the L1 ZL2 control signal is sent and received in the DRX operation in the DRX cycle using the first symbol or several symbols that can be used in the Unicast service. Do.

When downlink data is assigned to the mobile terminal using the L1ZL2 control signal, downlink data is not transmitted / received within the same subframe, and the next subframe of the cycle in which E-MBMS is transmitted. (Refer to (4) in Fig. 50) Transmit and receive downlink data.

In addition, when the E-MBMS transmission period and the timing of becoming active during the DRX operation period (the reception timing of the L1ZL2 control signal during the DRX operation period) do not overlap, the L1 ZL2 control signal is sent to the mobile terminal. When downlink data is assigned to the same resource, downlink data is transmitted and received within the same subframe as the radio resource and time axis assigned by the L1ZL2 control signal, as in normal dynamic scheduling.

[0416] FIG. 52 is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to the first modification. FIG. 52 is similar to FIG. 51, which is a sequence diagram showing an example of processing contents of the mobile terminal and base station according to Embodiment 13 of the present invention. Since the same step number performs the same process, the description is omitted.

[0417] The processing contents when downlink data is generated will be described.

When downlink data is generated, the base station proceeds to the process of step ST6201. The base station notifies that there is downlink data for the mobile terminal using the L1ZL2 control signal after the DRX cycle (step ST6201). In other words, downlink data allocation (Allocation) is performed (see (2) in Fig. 50). Then, the process proceeds to step ST6106.

[0418] The mobile terminal performs reception processing of the L1ZL2 control signal after the DRX cycle (step ST6202). Then, the process proceeds to step ST6110.

As a result of receiving (monitoring) the L1ZL2 control signal, the mobile terminal has data addressed to itself. It is determined whether or not the force is sufficient (step ST6110). If there is data addressed to itself, the process proceeds to step ST6107.

[0419] The base station determines whether or not the transmission timing of the L1ZL2 control signal during the DRX operation period for the mobile terminal overlaps with the E-MBMS transmission timing (step ST6106).

. When the transmission timing of the L1ZL2 control signal overlaps with the transmission timing of E-MBMS, the process proceeds to step ST6203.

The base station skips the transmission timing of downlink data by one subframe (step ST6203).

, E-MBMS transmits downlink data in the next subframe (see (4) in FIG. 50) (step ST6113).

[0420] The mobile terminal determines whether or not the transmission timing of the L1ZL2 control signal during the DRX operation period for the mobile terminal overlaps with the transmission timing of E-MBMS (step ST6107).

) o

If the transmission timing of the L1ZL2 control signal overlaps with the E-MBMS transmission timing, the processing moves to step ST6204.

The mobile terminal skips the downlink data reception timing by one subframe (step ST620 4), and transmits the downlink data in the subframe next to the cycle in which E-MBMS is transmitted (see (4) in Fig. 50). Reception is performed (step ST6114).

[0421] The base station determines whether or not the transmission timing of the L1ZL2 control signal during the DRX operation period for the mobile terminal overlaps with the E-MBMS transmission timing (step ST6106).

If the transmission timing of the L1ZL2 control signal does not overlap with the transmission timing of E-MBMS, the process proceeds to step ST6113.

In the radio resource allocated to the mobile terminal, downlink data is transmitted in the same subframe as the radio resource allocated in the L1ZL2 control signal and the time axis, as in normal dynamic scheduling.

[0422] The mobile terminal determines whether or not the reception timing of the L1ZL2 control signal during the DRX operation period for the mobile terminal overlaps with the transmission timing of E-MBMS (step ST6107).

) o If the reception timing of the L1ZL2 control signal does not overlap with the transmission timing of E-MBMS, the process proceeds to step ST6114.

In step ST6202, according to the radio resource allocated by the base station, the downlink resource is transmitted in the same subframe as the radio resource and time axis allocated by the L1ZL2 control signal, as in the case of normal dynamic scheduling. Receive.

[0423] Next, a case where downlink data is not generated will be described.

In the above description, when the transmission timing of the L1ZL2 control signal during the DRX operation period overlaps with the transmission timing of E-MBMS, the transmission timing of downlink data is skipped by one subframe, and the period of transmission of E-MBMS An example is shown in which downlink data is transmitted and received in the next subframe. As another example, downlink data may be transmitted / received after a specified subframe as a mobile communication system from the period when E-MBMS is transmitted, or after a subframe notified from a base station to a mobile terminal. .

In that case, the following parameters should be added to the L1ZL2 control signal during the DRX operation period (only the L1ZL2 control signal when the transmission timing of the L1ZL2 control signal during the DRX operation period overlaps with the E-MBMS transmission timing): By adding, it is possible to perform the above operations. For example, `` 0: Shift to DRX operation '', `` 1: Monitor L1ZL2 control signal of next subframe '', `` 2: Monitor L1ZL2 control signal after n subframes '', or `` 0: Shift to DRX operation '' 1: Downlink data allocation in the next subframe ”“ 2: Downlink data allocation after n subframes ”.

[0424] By using the DRX operation method shown in Modification 1 above, the following effects can be obtained in addition to the effects of using Embodiment 13.

Compared to the thirteenth embodiment, in the DRX operation during Active, the E-MBMS server does not change the timing when the mobile terminal becomes Active (see FIG. 15) during the DRX operation period. Service and Unicast service can be fully provided.

When a mobile terminal performs an operation other than the operation of checking (monitoring) whether or not downlink data addressed to itself is assigned / monitored when it becomes active during the DRX operation period, the operation timing of those operations If the (cycle) is not changed, the effect can be obtained.

Checking whether the downlink data addressed to you is assigned during the DRX operation period is as follows: (1) Sounding RS transmission, (2) CQI transmission, ( 3) Peripheral cell measurement can be considered.

Check whether the downlink data addressed to yourself is allocated during the DRX operation period! / Only the operation is the method shown in Embodiment 13 E—The subframe next to the cycle in which the MBMS is transmitted The above operations (1), (2), and (3) may be set to the same subframe as the E-MBMS transmission period. However, considering the low power consumption of the mobile terminal, it is effective to match the timing when the mobile terminal must perform the transmission operation and the reception operation as much as possible. Therefore, Modification 1 is effective in reducing the power consumption of the mobile terminal.

Embodiment 14.

In a mobile communication system, by using both C—RNTI (Cell Radio Network Temporary Identifier) and G—RNTI (Group RNTI) (GERAN Radio Network Temporary Identifier) to which a mobile terminal is assigned, the L1ZL2 control signal It is considered to monitor.

C-RNTI is an identifier of a mobile terminal assigned by a control RNC (Controlling Radio Network Controller). C—RNTI is unique in a cell.

In a mobile terminal that performs DRX operation in the DRX cycle, if the DRX cycle and the G-RNTI transmission cycle do not overlap, the L1ZL2 control signal corresponding to the G-RNTI will cause problems.

When a mobile terminal performs DRX operation (active DRX operation) for a mobile terminal to which G—RNTI is assigned, the following problems arise.

The problem of the fourteenth embodiment will be described with reference to FIG. In Fig. 53, the upward slanted line represents the L1ZL2 control signal for C-RNTI, and the downward slanted line represents the L1ZL2 control signal for G-RNTI.

[0426] When the mobile terminal performs DRX operation in the DRX cycle (X), the mobile terminal receives (monitors) the L1ZL2 control signal every DRX cycle (X) (see Fig. 53). (See (1) (2) (4) (5) (6)). Therefore, it is conceivable that the mobile terminal performs a low power consumption operation as exemplified in the reception system power source example of the mobile terminal shown in FIG.

Consider the case where the base station assigns a G-RNTI to the mobile terminal, not just C RNTI, and needs to monitor the L1ZL2 control signal using G-RNTI. G— Assume that the L1ZL2 control signal notification cycle or change cycle corresponding to RNTI is “Y”.

[0427] In the corresponding mobile terminal performing DRX operation in DRX cycle (X), the timing at which cycle X and cycle 重 overlap (corresponding to G—RNTI in (1) and (5) in Fig. 53) It is possible to receive the L1Z L2 control signal.

On the other hand, receiving the L1ZL2 control signal corresponding to G—RN TI at the timing when cycle X and cycle Y do not overlap ((3) in Fig. 53) will realize low power consumption by DRX cycle (X). As such, it is impossible to reach a mobile terminal.

As described above, there are problems in realizing low power consumption in mobile terminals to which G-RNTI is assigned.

Hereinafter, a DRX operation method as a mobile communication system according to Embodiment 14 will be described. FIG. 54 is an explanatory diagram showing an example of a DRX operation method as a mobile communication system according to Embodiment 14 of the present invention. is there.

When the mobile terminal performs DRX operation in the DRX cycle (X), the mobile terminal receives (monitors) the L1ZL2 control signal every DRX cycle (X) ((1) in FIG. 54). (See (3) (5) (7) (9)).

Consider the case where the base station assigns a G-RNTI to the mobile terminal, not just C RNTI, and needs to monitor the L1ZL2 control signal using G-RNTI. G—L1ZL2 control signal notification cycle (or change cycle) corresponding to RNTI is “Y” Suppose that

[0429] The base station recalculates the DRX cycle for the mobile terminal to which G-RNTI is assigned. When performing recalculation, calculate so that the mobile terminal can receive the L1ZL2 control signal corresponding to G-RNTI at the timing when period X and period Y do not overlap (see (3) in Fig. 53). .

As a specific example, the greatest common divisor of period X and period Y can be newly set as the DRX period. For example, the period “Z” in FIG.

[0430] Base station power When the DRX cycle (Z) is notified again to the mobile terminal, the mobile terminal is shown in (54) (1) (2) (3) (4) (5) (6) (7) In (8) and (9), the L1 / L2 control signal is received, and the mobile terminal performs L1ZL2 control even when the period X and the period Y do not overlap (see (3) in Fig. 53). A signal will be received.

FIG. 55 is a sequence diagram showing an example of processing contents of the mobile terminal and the base station according to Embodiment 14 of the present invention.

The base station notifies the mobile terminal of the DRX cycle, and sets the DRX cycle as the DRX cycle of the mobile terminal (step ST6501).

The mobile terminal receives the DRX cycle from the base station and sets the DRX cycle as the DRX cycle (step ST6502).

[0432] As an example of the initial DRX cycle notification method from the base station to the mobile terminal, the following method can be considered.

(2) The base station notifies the mobile terminal at a dynamic timing using an L1ZL2 control signal or in-band signaling (MAC signaling).

[0433] The base station and mobile terminal transition to DRX operation in the DRX cycle (step ST6503, step ST6504).

The base station notifies the mobile terminal of G-RNTI (step ST6505). The mobile terminal receives G—RNTI from the base station (step ST6506).

[0434] The base station transmits the DRX cycle notified to the mobile terminal in step ST6501 and the G—RNTI The DRX cycle for the mobile terminal is recalculated from the L1ZL2 control signal notification cycle (or change cycle) corresponding to (step ST6507).

The base station notifies the mobile terminal of the DRX cycle again, and sets the DRX cycle as the DRX cycle of the mobile terminal (step ST6508).

The mobile terminal re-receives the DRX cycle from the base station, and sets the DRX cycle as the DRX cycle (step ST6509).

[0435] The base station proceeds to the DRX operation in the DRX cycle (step ST6510).

The mobile terminal shifts to DRX operation in the DRX cycle (step ST6511). At that time, the mobile terminal can perform the DRX operation in the DRX cycle notified from the base station regardless of whether or not G-RNTI is notified.

[0436] Note that the problem of Embodiment 14 is that not only when the G-RNTI is assigned to the mobile terminal, the mobile terminal needs to receive a plurality of pieces of information in the L1ZL2 control signal in different periods. It also occurs in some cases. Even in this case, the problem can be solved by using the fourteenth embodiment.

[0437] According to the fourteenth embodiment, the following effects can be obtained.

Even if G-RNTI is assigned to the mobile terminal without newly transmitting / receiving information between the base station and the mobile terminal, the active DRX is still active as a mobile communication system. The effect that operation becomes realizable is acquired.

In order to solve the problem of the fourteenth embodiment, information newly transmitted / received between the base station and the mobile terminal should be provided to effectively use radio resources. This is an effective solution.

Furthermore, regardless of whether or not G-RNTI is notified from the base station, the mobile terminal can perform the DRX operation in the DRX cycle notified by the base station. It is possible to obtain an effect that the processing contents of can be simplified.

Industrial applicability

[0438] As described above, the mobile communication system according to the present invention needs to reduce the power consumption of the mobile terminal 3 and increase the standby time and continuous call time of the mobile terminal 3. Suitable for

Claims

The scope of the claims

[1] In a mobile communication system in which a mobile terminal and a base station perform radio communication, the mobile terminal determines whether or not it is possible to move to a temporary transmission stop period of data, and temporarily If the base station determines that the mobile terminal can transition to a temporary data suspension period, the base station determines that the data A mobile communication system characterized by temporarily stopping power supply to a transmission processing unit and a reception processing unit.

[2] When the mobile terminal determines that it is possible to shift to the temporary transmission suspension period of data, the mobile terminal notifies the base station to that effect, and the base station 2. The mobile communication system according to claim 1, wherein upon receiving the notification, the mobile terminal determines whether or not the mobile terminal can shift to a temporary data reception stop period.

[3] The mobile terminal confirms whether or not there is data to be transmitted to the base station. If there is no data to be transmitted to the base station, the mobile terminal can move to a temporary data transmission suspension period. The mobile communication system according to claim 1, wherein the determination is performed.

[4] The base station checks whether there is data to be transmitted to the mobile terminal, and if there is no data to be transmitted to the mobile terminal, the mobile terminal can move to a temporary data reception suspension period. The mobile communication system according to claim 1, wherein a determination to that effect is made

[5] In a mobile communication system in which a mobile terminal and a base station perform wireless communication, the mobile terminal transmits a parameter indicating whether or not priority is given to low power consumption to the base station, and the base station If the mobile terminal power indicates that the transmitted parameter has priority to low power consumption, the mobile terminal is set to a state in which it can transition to a temporary transmission stop period and a reception stop period of data, and the mobile terminal Terminal power When the transmitted parameter indicates that low power consumption is not given priority, the mobile terminal is set to a state incapable of transitioning between a temporary transmission suspension period and a reception suspension period of data. Mobile communication system.

[6] Transition determination means for determining whether or not it is possible to shift to a temporary transmission suspension period of data, and transition to a temporary reception suspension period of base station power data is possible A determination result receiving means for receiving a determination result indicating whether or not the transition determination means Indicates that the judgment result can be shifted to a temporary transmission suspension period, and the judgment result received by the judgment result receiving means can be shifted to a temporary reception suspension period. A mobile terminal provided with power supply stopping means for temporarily stopping the supply of power to the data transmission processing unit and the reception processing unit when indicating the fact.

[7] The migration according to claim 6, wherein the migration judging means notifies the base station of the fact when judging that the data can be transited to a temporary transmission suspension period. Terminal.

[8] The transition determination means confirms whether or not there is data to be transmitted to the base station. If there is no data to be transmitted to the base station, the transition determination means indicates that it is possible to transition to a temporary transmission suspension period of data. The mobile terminal according to claim 6, wherein the determination is performed.

[9] When the power supply stop means receives the supply stop period information indicating the power supply stop period for the data transmission processing section and the reception processing section from the base station, the power supply stop means and the transmission processing section and the transmission stop section information according to the supply stop period information. 7. The mobile terminal according to claim 6, wherein supply of power to the reception processing unit is stopped.

10. A priority determination unit that determines whether or not to prioritize low power consumption, and a parameter transmission unit that transmits a parameter indicating the determination content of the priority determination unit to a base station. 6. The mobile terminal according to 6.

[11] A mobile terminal comprising priority determination means for determining whether or not to prioritize low power consumption, and parameter transmission means for transmitting a parameter indicating content determined by the priority determination means to a base station.

12. The mobile terminal according to claim 11, wherein the parameter transmitting means includes a parameter indicating the determination content of the priority determining means in capability information indicating its own capability, and transmits the capability information to the base station.

13. The mobile terminal according to claim 11, wherein the parameter transmitting means transmits the parameter indicating the determination content of the priority determining means to the base station separately from the capability information indicating its own capability.

[14] The parameter transmission means transmits the parameter indicating the determination contents of the priority determination means to the base station when its own capability is changed or at a predetermined period. The mobile terminal according to claim 11.

15. The mobile terminal according to claim 11, wherein the priority determining means determines based on the remaining battery level when determining whether to prioritize low power consumption.

16. The mobile terminal according to claim 11, wherein the priority determining means determines whether to prioritize low power consumption based on a user's intention.

[17] In a mobile communication system in which a mobile terminal and a base station perform wireless communication, the mobile terminal determines whether it can move to a temporary transmission suspension period of data, and temporarily If it is possible to shift to a temporary transmission suspension period, the base station notifies the base station that it can transition to a temporary transmission suspension period, and the base station notifies the mobile terminal of the notification. When received, the mobile communication system determines whether or not the mobile terminal can shift to a temporary data reception stop period.

[18] In a mobile communication system in which a mobile terminal and a base station perform radio communication, the mobile terminal checks whether or not there is data to be transmitted to the base station, and has data to be transmitted to the base station. For example, the base station notifies the base station that there is data to be transmitted to the base station. When the base station receives the notification from the mobile terminal, the mobile terminal shifts to a temporary data reception suspension period. A mobile communication system characterized by determining whether or not a force is possible.

[19] When a mobile terminal and a base station perform wireless communication, the base station performs a transmission stop period during which data temporarily stops during a data transmission stop period and a reception during which data transitions during a temporary data reception stop period. In the mobile communication system in which the mobile terminal shifts to a temporary data transmission stop period and a data reception stop period at the transmission stop period and the reception stop period determined by the base station. The station determines the transmission stop period and the reception stop period as the same period, or determines the transmission stop period and the reception stop period as a multiple of the period.

[20] The base station, when determining the transmission stop period and the reception stop period to be the same period, notifies the mobile terminal of either the transmission stop period or the reception stop period. The mobile communication system described.

[21] Upon receiving notification of the reception stop period from the base station, the mobile terminal receives the transmission stop period. 21. The mobile communication system according to claim 20, wherein the mobile communication system is set to the same cycle as the communication stop cycle.

[22] When the mobile terminal and the base station perform wireless communication, the base station determines a reception stop period for shifting to a temporary data reception stop period, and the mobile terminal is determined by the base station. In a mobile communication system that shifts to a temporary data reception stop period in a reception stop period, the base station receives an acknowledgment signal transmitted from the mobile terminal, and then includes a control including the reception stop period. A mobile communication system, wherein data is transmitted to the mobile terminal.

[23] When the mobile terminal and the base station perform wireless communication, the base station determines a reception stop period for shifting to a temporary data reception stop period, and the mobile terminal is determined by the base station. In a mobile communication system that shifts to a temporary data reception stop period in a reception stop period, the base station transmits control data including the reception stop period to the mobile terminal. If the time required for retransmission exceeds the reception stop period, the mobile communication system is characterized in that the reception stop period is set again.

[24] When the mobile terminal and the base station perform wireless communication, the base station determines a reception stop period during which a temporary reception stop period of data is determined, and the mobile terminal is determined by the base station. In a mobile communication system that shifts to a temporary data reception stop period during a reception stop period, when multiple reception stop periods are set, the above mobile terminal power is transmitted for a certain reception stop period. After receiving the signal, a process of notifying the mobile terminal with the control data is performed, and for a certain reception stop period, the mobile terminal is notified with the control data and the time required for retransmission by HARQ. A mobile communication system, wherein when the reception stop period is exceeded, the mobile terminal performs processing for setting the reception stop period again.

[25] When the mobile terminal and the base station perform wireless communication, the base station determines a reception stop period during which a temporary reception stop period of data is determined, and the mobile terminal is determined by the base station. In a mobile communication system that shifts to a temporary data reception stop period in a reception stop period, the base station determines whether the mobile station performs the mobile according to the maximum number of retransmissions allowed. A mobile communication system characterized by determining a method of notifying the reception stop period to a terminal.

[26] When the required time corresponding to the maximum allowable number of retransmissions is longer than the reception stop period, the base station includes the reception stop period in the control data after receiving the acknowledgment signal transmitted from the mobile terminal. 26. The mobile communication system according to claim 25, wherein the mobile terminal is notified.

[27] When the mobile terminal and the base station perform wireless communication, the mobile terminal measures the quality of the downlink communication path, transmits the quality measurement result to the base station, and the base station In the mobile communication system that performs downlink scheduling according to a measurement result, the mobile terminal transmits the quality measurement result to the base station, and transmits an acknowledgment signal or a negative response signal to the base station. A mobile communication system characterized by delaying either the transmission timing of the quality measurement result or the transmission timing of the acknowledgment signal or negative acknowledgment signal when the timing overlaps.

[28] When the mobile terminal and the base station perform wireless communication, the mobile terminal measures the quality of the downlink communication path, transmits the quality measurement result to the base station, and the base station In the mobile communication system that performs downlink scheduling according to a measurement result, the mobile terminal transmits the quality measurement result to the base station, and transmits an acknowledgment signal or a negative response signal to the base station. A mobile communication system, wherein when the timing overlaps, the acknowledgment signal or the negative acknowledgment signal is transmitted without transmitting the quality measurement result.

[29] In a mobile terminal comprising quality measuring means for measuring the quality of a downlink communication channel and transmitting means for transmitting the measurement result of the quality measuring means to a base station, the transmitting means includes the measurement of the quality measuring means When the timing at which the result is transmitted to the base station overlaps with the timing at which the acknowledgment signal or the negative acknowledgment signal is transmitted to the base station, the transmission timing of the measurement result of the quality measurement device, or the acknowledgment signal or A mobile terminal characterized by delaying one of transmission timings of a negative response signal.

[30] In a mobile terminal comprising quality measuring means for measuring the quality of a downlink channel and transmitting means for transmitting the measurement result of the quality measuring means to a base station, the transmitting means includes the above When the timing of transmitting the measurement result of the quality measurement means to the base station overlaps with the timing of transmitting the acknowledgment signal or the negative response signal to the base station, the measurement result of the quality measurement device is not transmitted. A mobile terminal that transmits the acknowledgment signal or the negative acknowledgment signal.

[31] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station transition to a temporary data reception stop period. In a mobile communication system that shifts to a temporary data reception stop period at a reception stop period notified by the station, the base station stops the current reception when data to be transmitted to the mobile terminal is generated. The mobile terminal is notified of a reception stop period equal to or less than the period, and if there is no data to be transmitted to the mobile terminal, the mobile terminal is notified of a reception stop period greater than the current reception stop period. Mobile communication system

[32] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station transition to a temporary data reception stop period, and the mobile terminal In a mobile communication system that moves to a temporary data reception stop period at a reception stop period notified by a station, the mobile terminal receives a notification that there is data to be transmitted from the base station. The reception stop period is changed to the current reception stop period or less, and if the base station power is not notified that there is data to be transmitted, the reception stop period is changed to the current reception stop period or more. Mobile communication system.

[33] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station transition to a temporary data reception stop period. In a mobile communication system that moves to a temporary data reception stop period at a reception stop period notified by a station, the mobile terminal receives a notification that there is data to be transmitted from the base station. A mobile communication system, characterized by performing processing and changing a current reception stop period using the reception stop period change parameter corresponding to whether or not the notification is received.

[34] The mobile terminal does not receive a notification from the base station that there is data to be transmitted to itself. 34. The present invention is characterized in that when the reception stop cycle is changed, the current reception stop cycle is changed when there is no notification that there is data to be transmitted to itself for a predetermined number of times. Mobile communication system.

[35] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station transition to a temporary data reception stop period, and the mobile terminal In a mobile communication system that moves to a temporary data reception stop period at a reception stop period notified by a station, the mobile terminal has data to be transmitted to the base station continuously a predetermined number of times. A mobile communication system characterized by changing the current reception stop period using the reception stop period change parameter when not notified of the effect.

[36] When the mobile terminal and the base station perform wireless communication, the base station notifies service quality information to the mobile terminal, and the mobile terminal responds to the service quality information notified by the base station. A mobile communication system that sets a reception stop period that shifts to a temporary data reception stop period, and that transitions to a temporary data reception stop period at that reception stop period.

[37] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station transition to a temporary data reception stop period. In a mobile communication system that moves to a temporary data reception stop period at a reception stop period notified by a station, the mobile terminal is a period at which E-MBMS data is time-division multiplexed from the base station. A mobile communication system that receives a notification of an E-MBMS transmission cycle and delays the reception stop cycle when the E MBMS transmission cycle overlaps the reception stop cycle.

[38] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station shift to a temporary data reception stop period. In a mobile communication system that shifts to a temporary data reception stop period at a reception stop period notified by the station, the base station performs an E-MBMS transmission period that is a period for time-division multiplexing of E-MBMS data. Mobile communication characterized by delaying the transmission timing of data to be transmitted to the mobile terminal system.

[39] When the mobile terminal and the base station perform wireless communication, the base station notifies the mobile terminal of a reception stop period in which the mobile terminal and the base station shift to a temporary data reception stop period. In a mobile communication system that moves to a temporary data reception stop period at a reception stop period notified by a station, the mobile terminal is assigned a plurality of identifiers from the base station, and is assigned to a plurality of identifiers. A mobile communication system characterized by transitioning to a temporary data reception stop period at the reception stop period when a notification of one corresponding reception stop period is received.

[40] A reception stop period receiving means for receiving a notification of a reception stop period that shifts to a temporary data reception stop period from the base station, and a reception stop period received by the reception stop period reception means. In the mobile terminal equipped with a power transmission stop unit for temporarily stopping the supply of power to the data transmission processing unit and the reception processing unit in the temporary reception stop period, the base station transmits to itself. If a notification is received by the notification receiving means for receiving the notification that there is data and the notification receiving means, the reception stop period is changed to be equal to or less than the current reception stop period, and the notification receiving means notifies A mobile terminal comprising: a reception stop period changing means for changing the reception stop period to a current reception stop period or more if the signal is not received.

[41] A reception stop period receiving means for receiving a notification of a reception stop period that shifts to a temporary data reception stop period from the base station, and a reception stop period received by the reception stop period reception means. In the mobile terminal equipped with a power transmission stop unit for temporarily stopping the supply of power to the data transmission processing unit and the reception processing unit in the temporary reception stop period, the base station transmits to itself. The current reception stop period is changed using the notification receiving means that performs reception processing of notification that there is data and the reception stop period change parameter that corresponds to whether the notification is received by the notification receiving means. A mobile terminal comprising a reception stop period changing means.

[42] When changing the current reception stop period without receiving a notification from the base station that there is data to be transmitted to the base station, the reception stop period changing means continues by a predetermined number of times. If you do not receive a notification that there is data to send to 42. The mobile terminal according to claim 41, wherein the stop cycle is changed.

[43] A reception stop period receiving means for receiving a notification of a reception stop period that shifts to a temporary data reception stop period from the base station, and a reception stop period received by the reception stop period reception means. In the mobile terminal equipped with a power transmission stop unit for temporarily stopping the supply of power to the data transmission processing unit and the reception processing unit in the temporary reception stop period, the base station transmits to itself. When the notification receiving means for receiving the notification that there is data and the notification receiving means do not receive the notification that there is data to be transmitted to the notification receiving means for a predetermined number of times in succession, A mobile terminal comprising: a reception stop period changing means for changing a current reception stop period using a change parameter.

[44] Quality information receiving means for receiving quality information of a service from a base station, and reception stop for shifting to a temporary data reception stop period according to the quality information of the service received by the quality information receiving means The data transmission processing unit and the data reception processing unit are shifted to a data temporary reception stop period with the reception stop cycle setting means for setting the cycle and the reception stop cycle set by the reception stop cycle setting means. A mobile terminal comprising power supply stopping means for temporarily stopping power supply to the mobile phone.

[45] A reception stop period receiving means for receiving a notification of a reception stop period that shifts to a temporary data reception stop period from the base station, and a reception stop period received by the reception stop period reception means. In the mobile terminal provided with a power supply stop means for temporarily stopping the supply of power to the data transmission processing section and the reception processing section in the temporary reception stop period, the power supply stop means If the E-MBMS transmission period is notified from the base station, which is the period in which E-MBMS data is time-division multiplexed, and the E MBMS transmission period overlaps the reception stop period, the reception stop period is delayed. Feature mobile terminal.

[46] A reception stop period receiving means for receiving a notification of a reception stop period that shifts to a temporary data reception stop period from the base station, and a reception stop period received by the reception stop period reception means. Power supply stopping means for temporarily stopping the supply of power to the data transmission processing unit and the reception processing unit after shifting to a temporary reception stop period. In the mobile terminal provided, the power supply stop means is assigned a plurality of identifiers from the base station and receives a notification of one reception stop period corresponding to the plurality of identifiers.

The mobile terminal is characterized by shifting to a temporary data reception stop period in the reception stop period.