WO2017082244A1 - 無線通信装置 - Google Patents
無線通信装置 Download PDFInfo
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- WO2017082244A1 WO2017082244A1 PCT/JP2016/083085 JP2016083085W WO2017082244A1 WO 2017082244 A1 WO2017082244 A1 WO 2017082244A1 JP 2016083085 W JP2016083085 W JP 2016083085W WO 2017082244 A1 WO2017082244 A1 WO 2017082244A1
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- physical downlink
- downlink control
- control channel
- transmitted
- timer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/189—Transmission or retransmission of more than one copy of a message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless communication apparatus in which transmission / reception is repeatedly performed according to the reception power level of a wireless signal transmitted from a wireless base station.
- Non-Patent Document 1 In Release 13 of 3GPP (3rd Generation Partnership Project), LC (Low Complexity) and EC mode (Enhanced Coverage Mode) user devices for MTC (Machine Type Communication) assuming IoT (Internet of Things) scenarios (See Non-Patent Document 1).
- Non-Patent Document 2 DRX (Discontinuous Receipt) control is adopted for the purpose of battery saving of a user device (wireless communication terminal) (see Non-Patent Document 2).
- 3GPP RP-1504925 “Further LTE Physical Layer Enhancements for MTC”, 3GPP, March 2015 3GPP TS 36.321 version 12.4.0 Release 12 LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification, 3GPP, December 2014
- the MTC user apparatus has a limit on the number of bits that can be received at one time. For this reason, in MTC user apparatuses, it is considered that PDCCH (physical downlink control channel) and PDSCH (physical downlink shared channel) are transmitted in different subframes to allocate resources.
- PDCCH physical downlink control channel
- PDSCH physical downlink shared channel
- the EC mode is intended to expand the cell coverage in consideration of the case where the user apparatus is installed in a basement where radio waves are difficult to reach. Therefore, it is assumed that the user apparatus to which the EC mode is applied satisfies the required quality by repeatedly transmitting and receiving a signal a plurality of times, but there are various problems as follows.
- the user apparatus When performing DRX control, since the signal is repeatedly transmitted and received a plurality of times, the user apparatus needs to set a long timer for managing the active state, which increases battery consumption.
- a mismatch may occur between the user apparatus and the radio base station regarding the DRX state (active state or inactive state) of the user apparatus. If the user apparatus receives the PDCCH by mistake, a resource mismatch may occur between the user apparatus and the radio base station. When the user apparatus cannot properly receive the PDCCH, the radio base station transmits the PDSCH in vain.
- the present invention has been made in view of such a situation, and an object of the present invention is to provide a wireless communication apparatus that avoids problems caused by repeatedly transmitting and receiving a signal multiple times and appropriately communicates with a wireless base station.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times. From the receiving unit, the combining unit that combines the physical downlink control channel transmitted a plurality of times, and the combined physical downlink control channel, it is detected whether or not the timer for managing the active state in the intermittent reception control is necessary.
- the gist of the present invention is to provide an intermittent reception control unit that stops an already started timer and makes a transition to an inactive state without starting the timer when startup unnecessary is detected.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission and reception according to the reception power level of a wireless signal transmitted from a wireless base station, and a physical downlink control channel that is repeatedly transmitted a plurality of times, and a repetition
- a receiving unit that receives a physical downlink shared channel that is transmitted a plurality of times, and a combining unit that combines the physical downlink control channel that is transmitted a plurality of times and the physical downlink shared channel that is transmitted a plurality of times
- An intermittent reception control unit that activates a timer for managing an active state in intermittent reception control after reception of the physical downlink shared channel based on the physical downlink control channel, the intermittent reception control unit, The gist is to transition to an inactive state when the timer expires.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times.
- a reception unit, a combining unit that combines the physical downlink control channels transmitted a plurality of times, and a timer for managing an active state in intermittent reception control are started at a timing when the physical downlink control channel is successfully decoded.
- the intermittent reception control unit, and the intermittent reception control unit activates the timer with a timer time that takes into account the period from the time when the physical downlink control channel is first received to the time when the timer is activated. Then, the gist of the intermittent reception control unit is to transition to an inactive state when the timer expires.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times. Intermittent at the timing of receiving the last physical downlink control channel of the receiving unit, the combining unit that combines the physical downlink control channel transmitted a plurality of times, and the physical downlink control channel transmitted a plurality of times An intermittent reception control unit that activates a timer for managing an active state in reception control, and the intermittent reception control unit transitions to an inactive state when the timer expires.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times.
- a reception unit, a combining unit that combines the physical downlink control channels transmitted a plurality of times, and an intermittent that starts a timer for managing an active state in intermittent reception control every time the physical downlink control channel is received A reception control unit, wherein the intermittent reception control unit transitions to an inactive state when the timer expires.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times.
- the decoding of the physical downlink control channel is attempted with the reception unit and the decoding is successful, the physical downlink control channel that is repeatedly transmitted repeatedly is not decoded, or the physical downlink control that is repeatedly transmitted subsequently
- a decoding unit that discards the physical downlink control channel when the channel is successfully decoded, and the receiving unit is repeatedly transmitted a plurality of times based on the physical downlink control channel that was successfully decoded first.
- the main point is to attempt to receive the physical downlink shared channel.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times.
- the receiving unit attempts to decode the physical downlink control channel, succeeds in decoding first, and then succeeds in decoding different physical downlink control channels using the physical downlink control channel repeatedly transmitted subsequently,
- a decoding unit that discards the previously decoded physical downlink control channel, and the receiving unit receives a physical downlink shared channel that is repeatedly transmitted a plurality of times based on the physical downlink control channel decoded later
- the gist is to try.
- One aspect of the present invention is a wireless communication apparatus that performs repeated transmission / reception according to the reception power level of a wireless signal transmitted from a wireless base station, and receives a physical downlink control channel that is repeatedly transmitted multiple times. Even after receiving the receiver and the decoding of the physical downlink control channel and succeeding in decoding of the physical downlink control channel for the first time, different physical A decoding unit that attempts to decode a downlink control channel, and when the reception unit succeeds in decoding a plurality of different physical downlink control channels, the reception unit repeatedly performs decoding based on each physical downlink control channel that has been successfully decoded. The gist is to try to receive a physical downlink shared channel transmitted multiple times.
- FIG. 1 is an overall schematic configuration diagram of a mobile communication system 10.
- FIG. 2 is a diagram illustrating a resource allocation method.
- FIG. 3 is a diagram illustrating an example of repeated transmission of signals in the EC mode.
- FIG. 4 is a diagram showing an image of the number of repetitions according to the EC level.
- FIG. 5 is a diagram showing an outline of DRX control.
- FIG. 6 is a functional block configuration diagram of the UE 100.
- FIG. 7 is a functional block configuration diagram of the eNB 200.
- FIG. 8 is a diagram illustrating DRX control by the DRX timer.
- FIG. 9 is a diagram illustrating control of the DRX timer according to the first method of the first embodiment.
- FIG. 10 is a diagram illustrating control of the DRX timer according to the second method of the first embodiment.
- FIG. 11 is a diagram illustrating activation timings of the DRX timers of the UE 100 and the eNB 200.
- FIG. 12 is a diagram illustrating an operation when starting the DRX timer at the first timing according to the second embodiment.
- FIG. 13 is a diagram illustrating an operation when the DRX timer is started at the second timing according to the second embodiment.
- FIG. 14 is a diagram illustrating a case where the UE 100 erroneously receives a plurality of different PDCCHs.
- FIG. 15 is a diagram illustrating an operation when the UE 100 cannot receive the PDCCH.
- FIG. 16 is a functional block configuration diagram of the UE 100 according to the fourth embodiment.
- FIG. 17 is a diagram illustrating operations of the UE 100 and the eNB 200 according to the fourth embodiment.
- FIG. 1 is an overall schematic configuration diagram of a mobile communication system 10 according to the present embodiment.
- the mobile communication system 10 is a radio communication system according to LTE (Long Term Evolution) or LTE-Advanced.
- the mobile communication system 10 includes a radio access network 20 and a user apparatus 100 (hereinafter referred to as UE 100).
- UE 100 user apparatus 100
- the radio access network 20 is an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) defined in 3GPP, and includes a radio base station 200 (hereinafter, eNB 200).
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- eNB 200 radio base station 200
- UE100 and eNB200 perform radio
- UE100 and eNB200 are PUCCH (physical uplink control channel), such as PDCCH (physical downlink control channel), PDSCH (physical downlink shared channel), PUSCH (physical uplink shared channel), ACK / NACK, for example. ), SRS (Sounding Reference Symbol) and other signals or data are transmitted and received.
- the PDCCH includes control information such as resource allocation information and scheduling information.
- the mobile communication system 10 is not necessarily limited to LTE (E-UTRAN).
- the radio access network 20 may be a radio access network including a radio base station that performs radio communication with the UE 100 defined as 5G.
- the type of the UE 100 connected to the radio access network 20 is not particularly limited, but in the present embodiment, an MTC-UE that executes MTC (Machine Type Communication) is assumed.
- MTC is defined in 3GPP as communication performed without human intervention.
- resources are allocated by a method different from a normal resource allocation method.
- PDCCH and PDSCH are transmitted in the same subframe during normal downlink scheduling.
- the number of bits that can be transmitted per TTI (subframe) is limited. Therefore, as shown in FIG. 2B, in the MTC-UE, the PDCCH and the PDSCH are transmitted by different TTIs (inter-subframesubscheduling).
- LC Low Complexity
- EC mode Enhanced Coverage mode
- Main contents of LC mode are as follows.
- EC mode is for extending the coverage of a cell by the low reception power level (RSRP / RSRQ) of the radio signal transmitted from eNB200.
- the EC mode considers the case where the MTC-UE is installed in a basement where radio waves are difficult to reach.
- Zero coverage extension is a level at which cell coverage is not extended, that is, the EC mode is not applied.
- the 5dB coverage extension reduces the received power level by 5dB.
- the 10 dB coverage extension and the 15 dB coverage extension reduce the received power level by 10 dB and 15 dB.
- the number of repetitions (repetition times) corresponding to each level of coverage extension can be specified. For example, in the case of 15 dB coverage extension, the number of repetitions exceeding 100 times can be associated.
- FIG. 3 is a diagram illustrating an example of signal repetition transmission (repetition) in the EC mode.
- the eNB 200 transmits not only a data channel such as PDSCH but also a signal such as PDCCH to the UE 100 a plurality of times.
- UE 100 receives PDCCH repeatedly transmitted a plurality of times over a plurality of subframes, combines and decodes to acquire PDCCH. Thereby, required quality can be satisfied. The same applies to PDSCH.
- the UE 100 repeatedly transmits ACK or NACK (hereinafter, ACK / NACK) for the PDSCH to the eNB 200 a plurality of times.
- ACK / NACK ACK or NACK
- the eNB 200 receives ACK / NACK repeatedly transmitted a plurality of times over a plurality of subframes, combines and decodes the ACK / NACK to obtain ACK / NACK.
- UE 100 repeatedly transmits PUSCH to eNB 200 a plurality of times, and eNB 200 receives and synthesizes PUSCH that is repeatedly transmitted a plurality of times over a plurality of subframes, Decode and acquire PUSCH.
- the UE 100 profile is defined for each required quality. For example, when a very large amount of power is required for coverage, the number of repetitions increases. That is, as shown in FIG. 4, the number of repetitions (the number of repetitions) increases in the order of ⁇ 5 dB, ⁇ 10 dB, and ⁇ 15 dB.
- the UE 100 may be a device to which an EC mode in which repeated transmission / reception is performed according to the reception power level of a radio signal transmitted from the eNB 200 may be applied.
- DRX Discontinuous Reception
- RRC Radio Resource Control
- the UE 100 monitors the PDCCH and reports feedback information (CQI / PMI / RI / PTI, etc.) to the eNB 200.
- feedback information CQI / PMI / RI / PTI, etc.
- the UE 100 In the inactive state, in order to reduce battery consumption, the UE 100 does not monitor the PDCCH and does not report feedback information to the eNB 200.
- the UE 100 is in an active state when any of the following applies. If none of the following applies, the UE 100 is in an inactive state.
- FIG. 5 is a diagram illustrating an outline of DRX control.
- FIG. 5A shows DRX control of the UE 100 by drx-InactivityTimer (hereinafter referred to as DRX timer).
- DRX timer DRX control of the UE 100 by drx-InactivityTimer
- the DRX timer While the DRX timer is running, it is in an active state. And UE100 will change to an inactive state, if DRX timer expires. In the DRX control, the PDCCH can be received only in the active section of the DRX cycle.
- FIG. 5B shows DRX control of the UE 100 according to a DRX timer stop instruction transmitted from the eNB 200.
- the UE 100 starts / restarts the DRX timer.
- a DRX timer stop instruction for example, DRX ⁇ command MAC control Element
- the UE 100 forcibly stops the DRX timer and transitions to an inactive state. To do.
- FIG. 6 is a functional block configuration diagram of the UE 100. As illustrated in FIG. 6, the UE 100 includes a DL signal reception unit 110, a UL signal transmission unit 120, an EC control unit 130, a DRX control unit 140, and a processing unit 150.
- each functional block of the UE 100 includes a wireless communication module, a processor (including a memory), a functional module (user IF, position detection, camera, audio / video, etc.), a display, a power source (including a battery), and the like. Realized by hardware elements.
- a low-cost MTC terminal for MTC may be used for the UE 100 of the present embodiment.
- the function module may be a terminal that has only a minimum function and does not have a display.
- the UE 100 of the present embodiment may be a terminal to which the EC mode is applied. That is, it may be a terminal in which the number of repetition transmissions (repetition times) is defined according to the reception power level of the radio signal transmitted from the eNB 200. The number of repeated transmissions may be defined according to the type of signal.
- the DL signal receiving unit 110 receives a downlink signal (DL signal) transmitted from the eNB 200.
- the DL signal receiving unit 110 receives PDCCH and PDSCH that are repeatedly transmitted from the eNB 200 a plurality of times.
- the UL signal transmission unit 120 transmits an uplink signal (UL signal) to the eNB 200.
- the UL signal transmission unit 120 repeatedly transmits the PUSCH to the eNB 200 a plurality of times.
- the processing unit 150 executes predetermined processing.
- the EC controller 130 controls the repeated transmission and reception of signals. Note that the signals that are repeatedly transmitted and received are the same signals (or include similar signals having substantially the same contents except for different header information such as sequence numbers).
- the EC control unit 130 includes a synthesis unit 131, a decoding unit 132, and an iterative transmission unit 133.
- the combining unit 131 combines PDCCH and PDSCH transmitted from the eNB 200 a plurality of times.
- the decoding unit 132 tries to decode the PDCCH and the PDSCH synthesized by the synthesis unit 131.
- the repetitive transmission unit 133 controls the UL signal transmission unit 120 to repeatedly transmit the PUSCH a plurality of times.
- the DRX control unit 140 performs DRX control.
- the DRX control unit 140 detects the necessity of activation of the DRX timer for managing the active state in the DRX control from the synthesized and decoded physical downlink control channel, and detects the activation unnecessary, Without starting the DRX timer, the already started DRX timer is stopped, and a transition is made to the inactive state.
- the DRX control unit 140 activates a DRX timer for managing the active state in the DRX control after receiving the PDSCH based on the synthesized and decoded PDCCH.
- the PDSCH for example, the timing at which the repeatedly transmitted PDCCH was last received, the timing at which the repeatedly transmitted PDCCH was first received, the timing at which the PDCCH was successfully decoded, and the ACK / NACK for the PDCCH were transmitted. Such as timing.
- FIG. 7 is a functional block configuration diagram of the eNB 200. As illustrated in FIG. 7, the eNB 200 includes a DL signal transmission unit 210, a UL signal reception unit 220, an EC control unit 230, a DRX control unit 240, and a processing unit 250.
- each functional block of the eNB 200 is realized by hardware elements such as a wireless communication module, a processor (including a memory), a functional module (such as a network IF), and a power source.
- the DL signal transmission unit 210 transmits a downlink signal (DL signal) to the UE 100.
- DL signal transmission section 210 repeatedly transmits PDCCH and PDSCH to UE 100 a plurality of times.
- the UL signal receiving unit 220 receives an uplink signal (UL signal) transmitted from the UE 100.
- the UL signal receiving unit 220 receives PUSCH and ACK / NACK that are repeatedly transmitted from the UE 100 a plurality of times.
- the processing unit 250 executes predetermined processing.
- the EC control unit 230 controls the repeated transmission / reception of signals in the same manner as the EC control unit 230 of the UE 100.
- the EC control unit 230 includes a synthesis unit 231, a decoding unit 232, and a repetitive transmission unit 233.
- the combining unit 231 combines PUSCH and ACK / NACK transmitted from the UE 100 a plurality of times.
- the decoding unit 232 attempts to decode the PUSCH and ACK / NACK synthesized by the synthesis unit 231.
- the repetitive transmission unit 233 controls the UL signal receiving unit 220 to repeatedly transmit PUSCH and ACK / NACK to the UE 100 a plurality of times.
- DRX control unit 240 manages the DRX state (active state or inactive state) of UE 100.
- the reception timing of the PDCCH and PDSCH is shifted in time, so the setting value (timer time) of the DRX timer must be made longer.
- the DRX timer is too long, the time during which the UE 100 stays in the active state after data transmission / reception such as PDSCH ends is increased, and the battery is wasted.
- FIG. 8A is a diagram showing DRX control by a normal DRX timer that is not in the EC mode.
- the UE 100 Each time the UE 100 receives a newly transmitted PDCCH, the UE 100 starts (restarts) the DRX timer. Note that “startup” described below includes restart. Then, the UE 100 transitions to an inactive state when the DRX timer expires.
- FIG. 8B is a diagram illustrating DRX control by the DRX timer when repeated transmission is applied in the EC mode.
- repeated transmission of PDCCH is omitted.
- the DRX timer needs to set a longer time than usual. Therefore, until the DRX timer expires, even after completion of data transmission / reception (PDSCH transmission / reception), the time T1 in which the UE 100 stays in the active state becomes long and consumes a battery.
- the UE 100 autonomously determines whether or not to transition to the inactive state after data transmission / reception with reference to the PDCCH or the PDSCH.
- the eNB 200 when repeated transmission is performed, the DRX timer is made longer than usual.
- the eNB 200 notifies the UE 100 of the stop of the DRX timer at the timing when it is determined that there is no subsequent data in order to cover the scheduling delay due to repeated transmission, and the UE 100 stays in the active state unnecessarily, or is active Avoid transitioning to a state. That is, eNB200 transmits an explicit instruction
- FIG. 9 (a) is the same as FIG. 8 (a).
- FIG. 9B is a diagram illustrating the control of the first method.
- the eNB 200 determines whether to stop the DRX timer of the UE 100.
- the eNB 200 may determine whether to stop the DRX timer using the following information. Note that the eNB 200 may determine using any one of the following information, or may determine by combining a plurality of pieces of information.
- PDCP SDU size For example, if the PDCP SDU size is smaller than a predetermined value, the eNB 200 considers that there is no data to be transmitted next and does not need to start the DRX timer (or stop the DRX timer) On the other hand, when the PDCP SDU size is equal to or larger than the predetermined value, the eNB 200 considers that there is data to be transmitted next, and instructs the UE 100 to start the DRX timer, or the timer needs to be started.
- Data type to be transmitted for example, when transmitting RLC-ACK (RLC-NACK) in the downlink
- eNB 200 considers that there is no data to be transmitted next, and does not need to start the DRX timer (or stop the DRX timer)
- RLC-NACK RLC-NACK
- the eNB 200 when transmitting data other than RLC-ACK (RLC-NACK) on the downlink, the eNB 200 considers that there is data to be transmitted next, and instructs the UE 100 to start the DRX timer. Or do not set whether to start the timer.
- eNB200 sets the determination result to DCI (Downlink Control Information) of PDCCH, and transmits to UE100.
- DCI Downlink Control Information
- the UE100 detects the necessity of starting the DRX timer with reference to the DCI included in the received PDCCH at the reception timing of the PDCCH.
- the UE 100 does not start the DRX timer. That is, if the already started DRX timer continues without starting the DRX timer at the timing of receiving the PDCCH, the UE 100 forcibly stops the started timer and transitions to the inactive state. To do.
- the eNB 200 may set the determination result in the PDSCH control information and transmit it to the UE 100.
- the UE 100 forcibly stops the activated DRX timer at the timing when the last PDSCH of the PDSCH that is repeatedly transmitted is received or when the PDSCH that is repeatedly transmitted is successfully decoded, and enters the inactive state. You may migrate.
- UE 100 when receiving a PDCCH (including allocation information) addressed to itself, UE 100 activates a DRX timer after data transmission / reception based on the PDCCH (after PDSCH transmission / reception). That is, the UE 100 is in an active state for a predetermined period (time until the DRX timer expires) from when data transmission / reception ends.
- the scheduling delay due to repeated transmission is not added to the DRX timer. That is, as shown in FIG. 8B, the DRX timer is not made longer than usual, and the length is the same as that of the normal DRX timer as shown in FIG. 8A.
- FIG. 10 (a) is the same as FIG. 8 (a).
- FIG. 10B is a diagram illustrating the control of the second method.
- UE100 starts a DRX timer after transmission / reception of PDSCH.
- the trigger for starting the DRX timer may be a new PDCCH (new allocation information) as usual, or a PDCCH general (general allocation information in general) including retransmission, or any of those notified by PDCCH (DCI).
- PDCCH order For example, PDCCH order, Aperiodic CSI / SRS request, etc. may be used.
- “after data transmission / reception” may be the timing at which the PDSCH transmitted a predetermined number of times is received a predetermined number of times in the case of downlink.
- the predetermined number of times may be the last received timing (see FIG. 10B), or may be the timing at which the PDSCH transmitted for the predetermined number of times is first received. Alternatively, it may be the timing of PDSCH decoding completion (CRC check OK), the timing of transmitting ACK / NACK for PDSCH, or the timing of transmitting ACK / NACK a predetermined number of times (or a predetermined period).
- uplink it may be the timing at which the PUSCH to be transmitted a predetermined number of times is last transmitted, the timing at which the PUSCH to be transmitted a predetermined number of times is initially transmitted, or the timing at which the ACK / NACK for the PUSCH is first received, It may be the timing at which ACK / NACK is received a predetermined number of times (or a predetermined period).
- the actual DRX timer activation timing may be a subframe satisfying the above timing or the next subframe.
- TDD Time Division Duplex
- TDD config (DL / UL subframe) may be considered.
- Or UE100 is good also as starting a DRX timer for every PDSCH reception timing, PUSCH transmission timing, or ACK / NACK transmission / reception with respect to these.
- the normal (existing) DRX timer drx-InacitityTimer
- drx-InacitityTimer has been described as an example.
- the present invention is not limited to drx-InacitityTimer, and a new timer (active state in DRX control) It is also possible to use a timer for managing The new timer is activated at the time of PDSCH or PUSCH transmission / reception, and even if drx-InactivityTimer is not activated (expired) during the timer period, the UE 100 is considered to be in an active state.
- whether or not to apply the control of the present embodiment may be determined based on the EC level of the UE 100 or whether or not the UE 100 is LC (Low Complexity) -UE. For example, at an EC level that requires more coverage extension (for example, 15 dB coverage extension), the number of repetitions for satisfying the required quality increases, and it is wasted when a situation of concern as described in FIG. 8B occurs. The resources that are generated are larger and are undesirable from a system perspective. Therefore, in the case of such an EC level, it is conceivable to apply the control of this embodiment.
- LC Low Complexity
- the implementation complexity of the control according to this embodiment is assumed. It may not be applied to the UE 100.
- the processing unit 150 of the UE 100 holds its own EC level or information about whether or not it is an LC-UE, and implements this implementation based on an application rule notified from a network such as the eNB 200, for example. It may be determined whether to apply the form control.
- the UE 100 of the present embodiment detects whether or not the DRX timer for managing the active state in the DRX control is activated from the combined physical downlink control channel, and when detecting the activation unnecessary, the DRX timer Without starting, the already started DRX timer is stopped and transited to the inactive state.
- the UE 100 of the present embodiment sets the DRX timer longer than the normal DRX timer, it is not necessary to maintain the active state unnecessarily, and the battery consumption can be reduced.
- the UE 100 of the present embodiment After receiving the PDSCH based on the synthesized PDCCH, the UE 100 of the present embodiment starts a DRX timer for managing an active state in DRX control.
- the UE 100 can use a DRX timer having the same length as a normal DRX timer without taking into account a scheduling delay caused by repeatedly transmitting and receiving signals. Therefore, it is possible to prevent the active state from being maintained unnecessarily for a long time and to reduce battery consumption.
- the DRX state (active state, inactive state) always matches between the UE 100 and the eNB 200 in order to control whether the UE 100 can receive scheduling information.
- the UE 100 When the state is inconsistent between the UE 100 and the eNB 200, the UE 100 unnecessarily transits to the active state, or trouble such as failure to receive the scheduling information (PDCCH) transmitted from the eNB 200 occurs.
- PDCCH scheduling information
- FIG. 11 shows activation timings of the DRX timers of the UE 100 and the eNB 200.
- FIG. 11A is a diagram illustrating normal DRX control that is not in the EC mode. Each time the UE 100 receives a newly transmitted PDCCH, the UE 100 starts a DRX timer. The eNB 200 also uses the same DRX timer as that of the UE 100 to activate the DRX timer and monitor the DRX state of the UE 100 each time a PDCCH is newly transmitted.
- FIG. 11 (b) is a diagram showing DRX control when repeated transmission is applied in the EC mode.
- the eNB 200 repeatedly transmits the PDCCH eight times. Since the eNB 200 does not know where the UE 100 succeeded in decoding the PDCCH, the eNB 200 starts the DRX timer at the last timing of the repeated transmission (the timing when the PDCCH was transmitted last).
- the UE 100 when the UE 100 succeeds in decoding the PDCCH in the fifth repeated transmission, the UE 100 starts the DRX timer when the decoding is successful. Thereby, the DRX timer of UE100 expires before eNB200. For this reason, even if the eNB 200 transmits the PDCCH before the expiration of the DRX timer, the UE 100 cannot receive the PDCCH if the DRX timer has already expired and has transitioned to the inactive state.
- This embodiment avoids inconsistency of the DRX state between the UE 100 and the eNB 200.
- the UE 100 and the eNB 200 according to the present embodiment also have the same functional block configuration as the UE 100 and the eNB 200 according to the first embodiment.
- the DRX control unit 140 of the UE 100 activates the DRX timer included in the UE at the timing when the PDCCH decoding is successful.
- the DRX control unit 140 activates the DRX timer with a timer time obtained by subtracting a period from the time when the PDCCH is first received to the time when the timer is activated among the PDCCHs repeatedly transmitted a plurality of times (in the case of countdown). . Then, the DRX control unit 140 transitions to an inactive state when the DRX timer expires.
- the DRX timer is started with a timer time obtained by adding the period from the time when the PDCCH is first received to the time when the timer is started among the PDCCHs transmitted repeatedly a plurality of times.
- the DRX control unit 140 activates the DRX timer at the timing at which the PDCCH is successfully decoded, with a timer time that takes into account the period from when the PDCCH is first received to when the timer is activated.
- the DRX control unit 240 of the eNB 200 starts the DRX timer included in the eNB 200 at the timing when the first PDCCH is transmitted among the PDCCHs that are repeatedly transmitted a plurality of times.
- the DRX control unit 140 of the UE 100 may start the DRX timer included in the UE at the timing when the last PDCCH is received from the eNB 200 among the PDCCHs that are repeatedly transmitted a plurality of times. Then, the DRX control unit 140 transitions to an inactive state when the DRX timer expires. In this case, the DRX control unit 240 of the eNB 200 similarly activates the DRX timer included in itself at the timing of transmitting the last PDCCH among the PDCCHs that are repeatedly transmitted a plurality of times.
- the DRX control unit 140 of the UE 100 may restart the DRX timer included in the UE 100 each time it receives a PDCCH that is repeatedly transmitted a plurality of times. Then, the DRX control unit 140 transitions to an inactive state when the DRX timer expires. In this case, the DRX control unit 240 of the eNB 200 may restart the DRX timer included in the eNB 200 every time it repeatedly transmits the PDCCH.
- the UE 100 and the eNB 200 start their DRX timers at any one of the following three predetermined timings.
- FIG. 12 is a diagram showing an operation when the DRX timer is started at the first timing.
- the UE 100 succeeds in decoding the PDCCH, the UE 100 starts the DRX timer at the timing when the decoding is successful.
- the UE 100 starts the DRX timer with a timer time obtained by subtracting a period from the time when the PDCCH is first received among the PDCCHs repeatedly transmitted a plurality of times to the time when the timer is started.
- the UE 100 considers that the DRX timer is activated at the timing when the PDCCH of the first subframe of PDCCH repetitive transmission is received, and activates the DRX timer at the timing when decoding is successful.
- the eNB 200 starts the DRX timer at the timing when the PDCCH of the first subframe is transmitted among the PDCCHs to be repeatedly transmitted. Thereby, UE100 and eNB200 start each DRX timer at the substantially same timing.
- FIG. 13 is a diagram showing an operation when the DRX timer is started at the second timing.
- the UE 100 succeeds in decoding the PDCCH, the UE 100 starts the DRX timer at the timing of receiving the PDCCH of the last subframe in the repeated transmission of the PDCCH.
- the eNB 200 also starts the DRX timer at the timing when the PDCCH of the last subframe is transmitted among the PDCCHs that are repeatedly transmitted. Thereby, UE100 and eNB200 start each DRX timer at the substantially same timing.
- the UE 100 starts a DRX timer every time a subsequent PDCCH subframe is received if repeated transmission of the PDCCH continues even after successful decoding of the PDCCH.
- the eNB 200 also restarts the DRX timer every time it repeatedly transmits the PDCCH. Thereby, UE100 and eNB200 start each DRX timer at the substantially same timing.
- the following action / effect can be obtained.
- the UE 100 and the eNB 200 start the DRX timers held by the UE 100 and the eNB 200 at a predetermined timing.
- the UE 100 and the eNB 200 start their DRX timers at almost the same timing. For this reason, it is possible to prevent the DRX state from becoming inconsistent between the UE 100 and the eNB 200 (or to shorten the period of inconsistency as much as possible).
- the DRX timer of the UE 100 expires before the DRX timer of the eNB 200, a situation in which the UE 100 cannot receive the PDCCH transmitted before the expiration of the DRX timer can be avoided.
- the UE 100 may receive a plurality of different PDCCHs during the repeated transmission period.
- FIG. 14 is a diagram illustrating a case where the UE 100 erroneously receives a plurality of different PDCCHs.
- the illustrated example is a case where the number of repetition transmissions (repetition times) of the PDCCH is 8, and the eNB 200 transmits the PDCCH to the UE 100 in 8 subframes.
- the UE 100 succeeds in decoding the first PDCCH by receiving the PDCCH up to the fourth time.
- the PDCCH that has been successfully decoded first is a PDCCH with incorrect assignment information due to the influence of noise, interference, and the like.
- the UE 100 receives the PDCCH that is repeatedly transmitted in the fifth to eighth subframes, attempts to decode the PDCCH, and succeeds in decoding the PDCCH with allocation information different from the first PDCCH.
- the PDCCH that has been successfully decoded last is the correct PDCCH actually transmitted by the eNB 200.
- a mismatch of allocated resources is avoided between the UE 100 and the eNB 200.
- the UE 100 and the eNB 200 according to the present embodiment also have the same functional block configuration as the UE 100 and the eNB 200 according to the first embodiment.
- the UE 100 may not include the DRX control unit 140, and the eNB 200 may not include the DRX control unit 240.
- the decoding unit 132 of the UE 100 determines which PDCCH (including allocation information) that has been successfully decoded is used according to a predetermined rule.
- the following three rules can be considered as the predetermined rules.
- the decoding unit 132 attempts to decode the PDCCH repeatedly transmitted a plurality of times, and when decoding is successful, does not decode the PDCCH transmitted repeatedly thereafter, or When succeeding in decoding the PDCCH to be repeatedly transmitted subsequently, the PDCCH is discarded (or not transferred to the MAC layer).
- the DL signal receiving unit 11 attempts to receive PDSCH repeatedly transmitted a plurality of times based on the PDCCH that has been successfully decoded first.
- the UE 100 when the UE 100 succeeds in decoding the PDCCH and can acquire the allocation information included in the PDCCH, the UE 100 prioritizes the allocation information acquired first, and receives the PDSCH based on the allocation information. Try.
- the decoding unit 132 attempts to decode PDCCH that is repeatedly transmitted a plurality of times, and after successful decoding first, decodes a different PDCCH using the PDCCH that is repeatedly transmitted subsequently. If successful, the previously decoded PDCCH is discarded. In this case, the DL signal receiving unit 11 attempts to receive PDSCH repeatedly transmitted a plurality of times based on the PDCCH successfully decoded later.
- the UE 100 succeeds in decoding the PDCCH by repeated transmission and can acquire the allocation information included in the PDCCH, but succeeds in decoding another PDCCH by the subsequent repeated transmission. If the other allocation information included in is successfully acquired, the previous allocation information is discarded (or not transferred to the MAC layer).
- the decoding unit 132 attempts to decode the PDCCH that is repeatedly transmitted a plurality of times, and even after succeeding in decoding the PDCCH first, Attempts to decode different PDCCHs using the transmitted PDCCH.
- the DL signal receiving unit 11 successfully decodes a plurality of different PDCCHs
- the DL signal receiving unit 11 attempts to receive a PDSCH that is repeatedly transmitted a plurality of times based on each PDCCH that has been successfully decoded.
- the UE 100 when the UE 100 succeeds in decoding a plurality of different PDCCHs by repeated transmission and acquires a plurality of different allocation information, the UE 100 receives the PDSCH based on all of the plurality of different allocation information. Try. In the case of an incorrect PDCCH (allocation information), the PDSCH reception fails, and the PDSCH reception is successful with the correct PDCCH (allocation information). Note that the third rule may not be applied when the UE 100 repeatedly transmits PUSCH.
- the following action / effect can be obtained.
- the UE 100 determines which PDCCH (including allocation information) that has been successfully decoded is used according to a predetermined rule.
- the UE 100 when the UE 100 decodes a plurality of PDCCHs (assignment information), the UE 100 can determine which PDCCH is to be used to try to receive the PDCCH, and there is a mismatch in allocation resources between the UE 100 and the eNB 200. It can be avoided as much as possible.
- the eNB 200 In the EC mode, when the PDCCH (including scheduling information) is repeatedly transmitted multiple times, if the UE 100 cannot properly receive the PDCCH, there is a possibility that the PDSCH that the eNB 200 repeatedly transmits cannot be received. In this case, the eNB 200 repeatedly transmits the PDSCH in vain.
- the UE 100 misses the PDCCH, and the eNB 200 continues PDSCH transmission (or PUSCH reception) without noticing it, and downlink (or uplink) resources are wasted.
- the UE 100 has failed to receive the PDCCH due to a quality bottleneck, or the UE 100 has erroneously detected the PDCCH, and has already started receiving PDSCH (or PUSCH transmission) based on the erroneously detected PDCCH. There are cases.
- FIG. 15 is a diagram illustrating an operation when the UE 100 cannot receive the PDCCH.
- the eNB 200 repeatedly transmits the PDCCH to the UE 100 a predetermined number of times, but the UE 100 cannot receive the PDCCH.
- the eNB 200 Since it is unknown whether the UE 100 has received the PDCCH, the eNB 200 considers that the PDCCH has been received and starts transmitting the PDSCH. Since UE100 has not received PDCCH including scheduling information, UE100 does not attempt to receive PDCCH.
- the eNB 200 when the UE 100 cannot properly receive the PDCCH, the eNB 200 transmits the PDSCH (or attempts to receive the PUSCH) and avoids wasting downlink (or uplink) resources. It is.
- FIG. 16 is a functional block configuration diagram of the UE 100 according to the present embodiment.
- the UE 100 of the present embodiment is different from the UE 100 of the first embodiment shown in FIG.
- the eNB 200 of this embodiment has the same functional block configuration as the eNB 200 of the first embodiment shown in FIG.
- the UE 100 may not include the DRX control unit 140, and the eNB 200 may not include the DRX control unit 240.
- the UE 100 reports the PDCCH reception result to the eNB 200.
- eNB200 can grasp
- the report unit 134 of the UE 100 reports (notifies) the reception result of the PDCCH transmitted by the eNB 200 to the eNB 200.
- the reception result may be, for example, “reception completed” or “not received (or reception failed)”.
- UE100 may report the reception result of PDCCH to eNB200 by transmitting ACK / NACK for PDCCH to eNB200.
- the ACK / NACK may be repeatedly transmitted (repetition) or may not be repeatedly transmitted.
- the UE 100 may report the reception result to the eNB 200 using an individual resource assigned to the UE 100 (or UE 100 group). Individual resources may be allocated periodically. Further, even when assigned periodically, it may be applied only to the timing immediately after the PDCCH reception timing (or may be regarded as valid) immediately after (or for a predetermined period from immediately after).
- a conventional resource for example, a CSI report resource
- “OOR” may be transmitted.
- FIG. 17 is a diagram illustrating operations of the UE 100 and the eNB 200 according to the present embodiment.
- FIG. 17A is a diagram illustrating an operation when the UE 100 reports to the eNB 200 that the PDCCH has been received.
- the UE 100 transmits the PDCCH reception result (reception completion or ACK) to the eNB 200 and feeds it back without waiting for the reception of the PDSCH.
- the eNB 200 When the eNB 200 receives the reception result transmitted from the UE 100, the eNB 200 considers that the UE 100 has received the PDCCH, and starts transmitting the PDSCH to the UE 100. In addition, eNB200 may start transmission of PDSCH, without waiting for the reception result from UE100.
- FIG. 17B is a diagram illustrating an operation when the UE 100 reports to the eNB 200 that the PDCCH cannot be received. If the UE 100 cannot receive the PDCCH at the reception timing of the PDCCH, the UE 100 transmits the PDCCH reception result (not received or NACK) to the eNB 200 and feeds it back without waiting for the reception of the PDSCH.
- the eNB 200 When the eNB 200 receives the reception result transmitted from the UE 100, the eNB 200 considers that the UE 100 has not received the PDCCH and does not start transmitting the PDSCH to the UE 100. Or eNB200 stops transmission of PDSCH, when starting transmission of PDSCH, without waiting for the reception result from UE100.
- UE100 is good also as not transmitting the reception result of PDCCH to eNB200, when PDCCH cannot be received.
- the eNB 200 considers that the UE 100 has not received the PDCCH even if a predetermined time has elapsed from the transmission of the PDCCH, and does not start the transmission of the PDSCH to the UE 100. .
- eNB200 stops transmission of PDSCH, when starting transmission of PDSCH, without waiting for the reception result from UE100.
- the application timing of this embodiment may be limited. For example, it may be limited to the case of being in an active state by a DRX timer. Or it may be limited to the case where the effective uplink transmission timing is established (for example, when the TA timer is started and the individual resource is allocated).
- the UE 100 transmits the feedback result of the PDCCH to the eNB 200 and feeds it back without waiting for the reception of the PDSCH at the reception timing of the PDCCH.
- eNB200 can grasp
- the eNB 200 transmits the PDSCH without noticing it (or attempts to receive the PUSCH), and wastes downlink (or uplink) resources. Can be avoided.
- the repetitive transmission control in the EC mode may be performed by combining any of the first to fourth embodiments described above.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times. Intermittent reception from a receiving unit (DL signal receiving unit 110) that receives a control channel, a combining unit (combining unit 131) that combines the physical downlink control channels transmitted a plurality of times, and a combined physical downlink control channel Intermittent transition to the inactive state by stopping the already started timer without starting the timer when detecting the necessity of starting the timer for managing the active state in the control is detected. And a reception control unit (DRX control unit 140).
- a receiving unit DL signal receiving unit 110
- combining unit 131 that combines the physical downlink control channels transmitted a plurality of times
- a combined physical downlink control channel Intermittent transition to the inactive state by stopping the already started timer without starting the timer when detecting the necessity of starting the timer for managing the active state
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times.
- a receiving unit (DL signal receiving unit 110) that receives a control channel and a physical downlink shared channel that is repeatedly transmitted a plurality of times; a physical downlink control channel that is transmitted a plurality of times; and a physical downlink that is transmitted a plurality of times
- An intermittent reception control unit (DRX control unit 140), and the intermittent reception control unit includes the timer And summarized in that a transition to the inactive state when expired.
- the physical downlink shared channel after receiving the physical downlink shared channel, the timing at which the physical downlink shared channel is received a predetermined number of times, the timing at which the physical downlink shared channel is last received, the physical downlink shared channel May be a timing at which the physical downlink shared channel is successfully decoded, or a timing at which an ACK or NACK is transmitted for the physical downlink shared channel.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times.
- a receiving unit (DL signal receiving unit 110) that receives the control channel, a combining unit (combining unit 131) that combines the physical downlink control channels transmitted a plurality of times, and the physical downlink control channel have been successfully decoded.
- An intermittent reception control unit (DRX control unit 140) that starts a timer for managing an active state in intermittent reception control at a timing, and the intermittent reception control unit first receives a physical downlink control channel The timer is started and the intermittent reception control is performed with a timer time taking into account the period from the time of trying to the time of starting the timer. It is summarized in that a transition to the inactive state when the timer expires.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times.
- a receiving unit (DL signal receiving unit 110) that receives a control channel, a combining unit (combining unit 131) that combines the physical downlink control channel transmitted a plurality of times, and a physical downlink control channel that is transmitted a plurality of times
- An intermittent reception control unit (DRX control unit 140) that starts a timer for managing an active state in the intermittent reception control at a timing when the last physical downlink control channel is received.
- the gist is that the section transitions to an inactive state when the timer expires.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times. Every time a receiving unit (DL signal receiving unit 110) that receives a control channel, a combining unit (combining unit 131) that combines the physical downlink control channels transmitted a plurality of times, and the physical downlink control channel are received.
- An intermittent reception control unit (DRX control unit 140) that starts a timer for managing an active state in the intermittent reception control, and the intermittent reception control unit transitions to an inactive state when the timer expires The gist is to do.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and that is repeatedly transmitted multiple times. Attempts to decode the physical downlink control channel with the receiving unit (DL signal receiving unit 110) that receives the link control channel, and if the decoding is successful, the subsequent physical downlink control channel that is repeatedly transmitted is not decoded.
- DL signal receiving unit 110 the receiving unit that receives the link control channel
- a decoding unit (decoding unit 132) that discards the physical downlink control channel when succeeding decoding of the physical downlink control channel that is repeatedly transmitted succeeds, and the receiving unit decodes first Based on the physical downlink control channel that has been successfully used, it may attempt to receive a physical downlink shared channel that is repeatedly transmitted multiple times. The the gist.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times.
- a receiving unit (DL signal receiving unit 110) that receives a control channel and a physical downlink control channel that is repeatedly transmitted after the first successful decoding is attempted after the decoding of the physical downlink control channel is successful.
- a decoding unit (decoding unit 132) that discards the previously decoded physical downlink control channel when decoding of the physical downlink control channel is successful, and the receiving unit decodes the physical downlink control channel decoded later
- the main point is to attempt to receive a physical downlink shared channel that is repeatedly transmitted a plurality of times.
- One aspect of the present invention is a radio communication apparatus (for example, UE 100) that repeatedly performs transmission / reception according to the reception power level of a radio signal transmitted from a radio base station, and repeatedly transmits the physical downlink multiple times.
- a receiving unit (DL signal receiving unit 110) that receives the control channel and attempts to decode the physical downlink control channel, and even after succeeding in decoding the physical downlink control channel for the first time, subsequent repeated transmission
- a decoding unit (decoding unit 132) that attempts to decode different physical downlink control channels using the physical downlink control channel, and the receiving unit has successfully decoded a plurality of different physical downlink control channels.
- a physical downlink shared channel that is repeatedly transmitted multiple times based on each physical downlink control channel that has been successfully decoded. And summarized in that attempt to receive.
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Abstract
Description
(1)移動通信システムの全体概略構成
図1は、本実施形態に係る移動通信システム10の全体概略構成図である。図1に示すように、移動通信システム10は、LTE(Long Term Evolution)またはLTE-Advancedに従った無線通信システムである。移動通信システム10は、無線アクセスネットワーク20、及び、ユーザ装置100(以下、UE100)を含む。
・送信電力: 3dB低減(従来は23dBm)
・RF受信数(RF Rx chains): 1
・通信方式: 半二重通信(オプショナル)
・下りリンク(DL)最大通信速度: 1Mbps
また、ECモードは、eNB200から送信される無線信号の受信電力レベル(RSRP/RSRQ)の低さによって、セルのカバレッジを拡張するためのものである。ECモードはMTC-UEが、電波の届きにくい地下室等に設置されているようなケースを考慮したものである。
・5dB coverage extension
・10dB coverage extension
・15dB coverage extension
Zero coverage extensionは、セルのカバレッジを拡張しない、つまり、ECモードが適用されないレベルである。5dB coverage extensionは、受信電力レベルを5dB低減する。同様に、10dB coverage extension及び15dB coverage extensionは、受信電力レベルを10dB、15dB低減する。
・スケジューリング要求(Scheduling request)を送信した場合
・UL HARQ再送のためのUL grantが割り当てられる場合
・ランダム・アクセス・レスポンス(Random Access Response)を受信し、その後、新規に送信を指示するPDCCHを受信していない場合
図5は、DRX制御の概要を示す図である。図5(a)は、drx-InactivityTimer(以下、DRXタイマ)によるUE100のDRX制御を示す。UE100は、PDCCHを受信すると、DRXタイマを起動/再起動する。DRXタイマが起動中は、アクティブ状態である。そして、UE100は、DRXタイマが満了すると、非アクティブ状態に遷移する。DRX制御では、DRXサイクルのアクティブ状態の区間においてのみPDCCHの受信が可能となる。
次に、移動通信システム10の機能ブロック構成について説明する。具体的には、UE100及びeNB200の機能ブロック構成について説明する。
図6は、UE100の機能ブロック構成図である。図6に示すように、UE100は、DL信号受信部110と、UL信号送信部120と、EC制御部130と、DRX制御部140と、処理部150と、を備える。
図7は、eNB200の機能ブロック構成図である。図7に示すように、eNB200は、DL信号送信部210と、UL信号受信部220と、EC制御部230と、DRX制御部240と、処理部250と、を備える。
次に、移動通信システム10の動作について説明する。ECモードでは、前述のとおり、信号を繰り返し送信(repetition or bundling)し、複数の信号を合成することによって、所要品質を満たすことを想定している。
第1の方法では、UE100は、PDCCHまたはPDSCHを参照して、データ送受信後に、非アクティブ状態に遷移するか否かを自律的に判定する。
・PDCP SDUサイズ(例えば、PDCP SDUサイズが所定値より小さい場合、eNB200は、次に送信するデータは無いとみなして、DRXタイマの起動不要(または、DRXタイマ停止)をUE100に指示する。一方、PDCP SDUサイズが所定値以上の場合、eNB200は、次に送信するデータが有るとみなして、DRXタイマの起動要をUE100に指示する、または、タイマの起動要否を設定しない。)
・送信するデータ種別(例えば、RLC-ACK(RLC-NACK)を下りリンクで送信する場合、eNB200は、次に送信するデータは無いとみなして、DRXタイマの起動不要(または、DRXタイマ停止)をUE100に指示する。一方、RLC-ACK(RLC-NACK)以外のデータを下りリンクで送信する場合、eNB200は、次に送信するデータが有るとみなして、DRXタイマの起動要をUE100に指示する、または、タイマの起動要否を設定しない。)
そして、eNB200は、判断結果をPDCCHのDCI(Downlink Control Information)に設定し、UE100に送信する。
第2の方法では、UE100は、自分宛のPDCCH(割当て情報を含む)を受信する場合、当該PDCCHに基づくデータ送受信後(PDSCH送受信後)にDRXタイマを起動する。すなわち、UE100は、データ送受信が終了した時点から所定の期間(DRXタイマが満了するまでの時間)はアクティブ状態とする。
上述した第1実施形態によれば、以下の作用効果が得られる。上述したように、本実施形態のUE100は、合成した物理下りリンク制御チャネルから、DRX制御におけるアクティブ状態を管理するためのDRXタイマの起動要否を検出し、起動不要を検出した場合、DRXタイマを起動することなく、既に起動済みのDRXタイマを停止して、非アクティブ状態に遷移する。
次に、本発明の第2実施形態について説明する。以下、上述した第1実施形態と異なる部分について主に説明し、同様の部分については、その説明を適宜省略する。
図6および図7に示したように、本実施形態に係るUE100及びeNB200も、第1実施形態に係るUE100及びeNB200と同様の機能ブロック構成を有する。
次に、移動通信システム10の動作について説明する。
上述した第2実施形態によれば、以下のような作用効果が得られる。上述したように、本実施形態では、UE100およびeNB200は所定のタイミングで、それぞれが保持するDRXタイマを起動する。
次に、本発明の第3実施形態について説明する。以下、上述した第1実施形態と異なる部分について主に説明し、同様の部分については、その説明を適宜省略する。
図6および図7に示したように、本実施形態に係るUE100及びeNB200も、第1実施形態に係るUE100及びeNB200と同様の機能ブロック構成を有する。なお、本実施形態では、UE100は、DRX制御部140を備えなくてもよく、また、eNB200は、DRX制御部240を備えなくてもよい。
上述した第3実施形態によれば、以下のような作用効果が得られる。上述したように、本実施形態では、UE100は、所定のルールに従って、復号に成功したPDCCH(割り当て情報を含む)のどれを用いるかを決定する。
次に、本発明の第4実施形態について説明する。以下、上述した第1実施形態と異なる部分について主に説明し、同様の部分については、その説明を適宜省略する。
図16は、本実施形態のUE100の機能ブロック構成図である。本実施形態のUE100は、図6に示す第1実施形態のUE100と、報告部134を備える点において異なる。本実施形態のeNB200は、図7に示す第1実施形態のeNB200と同様の機能ブロック構成を有する。なお、本実施形態では、UE100は、DRX制御部140を備えなくてもよく、また、eNB200は、DRX制御部240を備えなくてもよい。
次に、移動通信システム10の動作について説明する。
上述した第4実施形態によれば、以下のような作用効果が得られる。本実施形態では、UE100は、PDCCHの受信タイミングにおいて、PDSCHの受信を待つことなく、PDCCHの受信結果をeNB200に送信し、フィードバックする。
以上、実施形態に沿って本発明の内容を説明したが、本発明はこれらの記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
20 無線アクセスネットワーク
100 UE
110 DL信号受信部
120 UL信号受信部
130 EC制御部
131 合成部
132 復号部
133 繰返送信部
134 報告部
140 DRX制御部
150 処理部
200 eNB
210 DL信号送信部
220 UL信号受信部
230 EC制御部
231 合成部
232 復号部
233 繰返送信部
240 DRX制御部
250 処理部
Claims (9)
- 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記複数回送信される物理下りリンク制御チャネルを合成する合成部と、
合成した物理下りリンク制御チャネルから、間欠受信制御におけるアクティブ状態を管理するためのタイマの起動要否を検出し、起動不要を検出した場合、前記タイマを起動することなく、既に起動済みのタイマを停止して、非アクティブ状態に遷移する間欠受信制御部と、を備えること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルと、繰り返し複数回送信される物理下りリンク共有チャネルとを受信する受信部と、
前記複数回送信される物理下りリンク制御チャネルおよび前記複数回送信される物理下りリンク共有チャネルを合成する合成部と、
合成した前記物理下りリンク制御チャネルに基づいた前記物理下りリンク共有チャネルの受信後に、間欠受信制御におけるアクティブ状態を管理するためのタイマを起動する間欠受信制御部と、を備え、
前記間欠受信制御部は、前記タイマが満了した場合に非アクティブ状態に遷移すること
を特徴とする無線通信装置。 - 請求項2記載の無線通信装置であって、
前記物理下りリンク共有チャネルの受信後は、前記物理下りリンク共有チャネルを所定回数受信したタイミング、前記物理下りリンク共有チャネルを最後に受信したタイミング、前記物理下りリンク共有チャネルを最初に受信したタイミング、前記物理下りリンク共有チャネルの復号に成功したタイミング、または、前記物理下りリンク共有チャネルに対するACKまたはNACKを送信したタイミングであること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記複数回送信される物理下りリンク制御チャネルを合成する合成部と、
前記物理下りリンク制御チャネルの復号に成功したタイミングで、間欠受信制御におけるアクティブ状態を管理するためのタイマを起動する間欠受信制御部と、を備え、
前記間欠受信制御部は、最初に物理下りリンク制御チャネルの受信を試みる時点から前記タイマを起動した時点までの期間を加味したタイマ時間で、前記タイマを起動し、
前記間欠受信制御部は、前記タイマが満了した場合に非アクティブ状態に遷移すること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記複数回送信される物理下りリンク制御チャネルを合成する合成部と、
前記複数回送信される物理下りリンク制御チャネルのうち最後の前記物理下りリンク制御チャネルを受信したタイミングで、間欠受信制御におけるアクティブ状態を管理するためのタイマを起動する間欠受信制御部と、を備え、
前記間欠受信制御部は、前記タイマが満了した場合に非アクティブ状態に遷移すること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記複数回送信される物理下りリンク制御チャネルを合成する合成部と、
前記物理下りリンク制御チャネルを受信する度に、間欠受信制御におけるアクティブ状態を管理するためのタイマを起動する間欠受信制御部と、を備え、
前記間欠受信制御部は、前記タイマが満了した場合に非アクティブ状態に遷移すること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記物理下りリンク制御チャネルの復号を試み、復号に成功した場合、後続の繰り返し送信される物理下りリンク制御チャネルの復号を行わない、または、後続の繰り返し送信される物理下りリンク制御チャネルの復号に成功した場合は当該物理下りリンク制御チャネルを破棄する復号部と、を備え、
前記受信部は、最初に復号に成功した物理下りリンク制御チャネルに基づいて、繰り返し複数回送信される物理下りリンク共有チャネルの受信を試みること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記物理下りリンク制御チャネルの復号を試み、最初に復号に成功した後に、後続の繰り返し送信される物理下りリンク制御チャネルを用いて異なる物理下りリンク制御チャネルの復号に成功した場合、先に復号した物理下りリンク制御チャネルを破棄する復号部と、を備え、
前記受信部は、後に復号した前記物理下りリンク制御チャネルに基づいて、繰り返し複数回送信される物理下りリンク共有チャネルの受信を試みること
を特徴とする無線通信装置。 - 無線基地局から送信される無線信号の受信電力レベルに応じた繰り返し送受信が実施される無線通信装置であって、
繰り返し複数回送信される物理下りリンク制御チャネルを受信する受信部と、
前記物理下りリンク制御チャネルの復号を試み、最初に前記物理下りリンク制御チャネルの復号に成功した後であっても、後続の繰り返し送信される物理下りリンク制御チャネルを用いて異なる物理下りリンク制御チャネルの復号を試みる復号部と、を備え、
前記受信部は、異なる複数の物理下りリンク制御チャネルの復号に成功した場合、復号に成功した各物理下りリンク制御チャネルに基づいて、繰り返し複数回送信される物理下りリンク共有チャネルの受信を試みること
を特徴とする無線通信装置。
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