WO2009119477A1 - Communication system, base station device, and mobile station device - Google Patents

Communication system, base station device, and mobile station device Download PDF

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Publication number
WO2009119477A1
WO2009119477A1 PCT/JP2009/055595 JP2009055595W WO2009119477A1 WO 2009119477 A1 WO2009119477 A1 WO 2009119477A1 JP 2009055595 W JP2009055595 W JP 2009055595W WO 2009119477 A1 WO2009119477 A1 WO 2009119477A1
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WO
WIPO (PCT)
Prior art keywords
period
mbms service
intermittent reception
mbms
overlap
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PCT/JP2009/055595
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French (fr)
Japanese (ja)
Inventor
平川功
山田昇平
中嶋大一郎
鈴木翔一
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シャープ株式会社
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Publication of WO2009119477A1 publication Critical patent/WO2009119477A1/en

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • 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 communication system, a base station apparatus, and a mobile station apparatus, and more particularly to a communication technique that performs an MBMS service in a mixed cell and performs an intermittent reception method on the mobile station apparatus side.
  • EUTRA evolved third generation radio access
  • EUTRA evolved third generation radio access
  • Evolved Universal Terrestrial Radio Access evolved third generation radio access network
  • EUTRA evolved third generation radio access network
  • FIG. 14 is a diagram illustrating a channel configuration example in EUTRA.
  • the EUTRA downlink (communication from the base station to the mobile station) includes a downlink multicast channel (PMCH: Physical Multichannel), a downlink shared channel (PDSCH: Physical Downlink Shared Channel), and a downlink control channel (PDCCH: It consists of a Physical Downlink Control Channel) and a downlink broadcast channel (PBCH: Physical Boradcast Channel).
  • PMCH Physical Multichannel
  • PDSCH Physical Downlink Shared Channel
  • PDCCH downlink control channel
  • PBCH Physical Boradcast Channel
  • the uplink of EUTRA (communication from a mobile station to a base station) includes a random access channel (RACH: Random Access Channel), an uplink shared channel (PUSCH: Physical Uplink Shared Channel), and an uplink control channel (PUCCH: Physical). Uplink Control Channel) (for example, see Non-Patent Document 1 below).
  • RACH Random Access Channel
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • FIG. 15 is a diagram illustrating an example of a frame configuration in the downlink in EUTRA (see Non-Patent Document 2 below). Data transmission to the mobile station apparatus is performed in units of subframes (1 ms each from # 0 to # 9). Ten subframes are collectively referred to as a radio frame. In the figure, radio frames F11 and F12 (10 ms units) are shown.
  • the MBMS service is a service that provides a broadcast service over a plurality of cells at the same time and at the same frequency.
  • a cell that provides an MBMS service a cell (MBMS) that specializes in MBMS transmission using a frequency different from the frequency used for unicast transmission (transmission from a single cell to individual receivers).
  • MBMS Multimedia Boradcast Multicast Service
  • FIG. 16 is a diagram illustrating an arrangement example of mixed cells. As shown in FIG. 16, it is determined which subframe is used for the MBMS service in one radio frame composed of 10 MBMS subframes, and what interval is used for the radio frame including the MBMS service. It is decided whether or not to repeat. This arrangement information is called an MBMS subframe allocation pattern (MBSAP), and this pattern is notified from the base station apparatus to the mobile station apparatus in advance.
  • MMSAP MBMS subframe allocation pattern
  • the mobile station apparatus can know in which subframe the MBMS service is implemented.
  • a subframe that is set as an MBMS service may be provided by this MBMS subframe arrangement pattern is called an MBMS subframe.
  • data may be transmitted to individual receiving terminals.
  • “1”, “2”, “4”, “6”, “7”, “8”, “9” are MBMS subframes (subframes indicated by hatching). ).
  • FIG. 17 is a diagram showing an outline of the DRX control technology.
  • the mobile station apparatus repeats an on-duration and a DRX opportunity (opportunity for DRX) at DRX cycle (repetition period) intervals.
  • DRX cycle repetition period
  • the on period is a period composed of one subframe or a plurality of subframes in which the mobile station apparatus is determined to monitor the PDCCH.
  • the base station apparatus transmits a PDCCH in order to start uplink or downlink resource allocation in the on period.
  • the mobile station apparatus that has received the PDCCH (indicated by a white arrow) indicating the scheduling of uplink or downlink initial transmission data (new data) monitors the PDCCH for a certain period exceeding the on period. (Monitoring period after receiving PDCCH).
  • the mobile station apparatus monitors the PDCCH regardless of whether it is an on period.
  • a period in which the mobile station apparatus activates the reception unit and the reception unit is awake is referred to as an active period (Active Time).
  • the base station device transmits data while the mobile station device is active. From the base station apparatus to the mobile station apparatus, the repetition period and ON period of the DRX cycle are notified in advance, and the mobile station apparatus periodically repeats power-on in advance based on the information, and the reception status of PDCCH, The power is turned on according to the data retransmission status (see Non-Patent Document 3).
  • 3GPP TS Technical Specification 36.300 V8.3.0 (2007-12), Evolved Universal Terrestrial Radio Access (EUTRA) and Evolved Universal Terrestrial Radio Access Network (EUTRAN); Overall description; Stage2 (Release 8) 3GPP TSG-RAN WG2 # 60bis R2-080198 Signaling of MBSFN Subframe Allocations Severa, January 14-18, 2008 3GPP TS 36.321 V8.0.0 (2007-12) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification (Release 8 )
  • DRX When performing DRX control, it is necessary to match the data transmission timing of the base station apparatus with the activity period of the mobile station apparatus. Time information such as the DRX cycle and the ON period is notified in advance from the base station apparatus, and the mobile station apparatus flexibly controls the activity period and the DRX opportunity according to the information and the reception status of the PDCCH. In EUTRA, DRX is enabled by notifying such minimum information.
  • the base station apparatus transmits only the MBMS service when the period during which the MBMS service is performed overlaps with the active period in the DRX control of the mobile station apparatus. Data cannot be transmitted to the station device. Therefore, normally, the transmission period of the MBMS subframe and the DRX cycle are synchronized so that the active period in the DRX control does not overlap with the MBMS subframe.
  • FIG. 18 is a diagram showing this relationship. As shown in FIG. 18, the MBMS service is performed in a cycle of 4 radio frames (40 ms) such that F1 follows F5. In the radio frames F1, F5, F9,. 6 and 7 are assigned to the MBMS subframe.
  • the DRX cycle is 20 ms, and it is assumed that there are two subframes in 20 ms and an ON period in DRX control.
  • both can be compatible without overlapping.
  • the radio frame in which the MBMS subframe exists is arranged such that the ON period in the DRX control comes like the mobile station apparatus B, the on period in the DRX control is set in the subframe in which the MBMS subframe does not exist.
  • the subframe in which the MBMS subframe exists and the ON period in the DRX control overlap. Accordingly, data cannot be transmitted in a subframe in which an MBMS subframe exists, and data cannot be transmitted. That is, when assigning the ON period in the DRX control to the receiver, the degree of freedom of assignment is limited.
  • the radio frame in which the MBMS subframe exists is set to 40 ms, which is twice the activity cycle (20 ms) in the DRX control, has been described, but even when the frequency of the MBMS service is low and 160 ms is set.
  • the degree of freedom to which the ON period in DRX control is assigned does not change. That is, there is a problem that inefficiency occurs when the frequency of MBMS service is low.
  • the arrangement like the mobile station apparatus C becomes a problem when the arrangement pattern for performing the MBMS service is rearranged.
  • subframes allocated to the MBMS service may be rearranged for effective use of radio resources.
  • MBMS is provided with services using the same subframe arrangement pattern in a plurality of cells. Therefore, the number of receiving terminals that perform DRX control included in these cells is considerable.
  • MBMS subframes are increased and rearranged, it is very difficult to secure subframes that are not used by all the receiving terminals.
  • the present invention has an object to provide a communication technique that allows data transmission and reception by a mobile station apparatus even when the intermittent reception period and the MBMS service period overlap.
  • the scheduling means includes an MBMS service. If the MBMS service period and the data transmission period to the receiver overlap, the data transmission period to the receiver is moved outside the MBMS service period.
  • a mobile station apparatus having a function of performing transmission and performing intermittent reception has a function of performing reception by expanding the intermittent reception period when the intermittent reception period and the MBMS service period overlap.
  • the scheduling means has a function of performing transmission by moving the data transmission period to the subsequent receiver outside the MBMS service period when the MBMS service period and the data transmission period to the receiver overlap.
  • the mobile station apparatus that performs reception has a function of performing reception by expanding the subsequent intermittent reception period when the intermittent reception period and the MBMS service period overlap.
  • the base station apparatus uses a predetermined period as an extension period or a movement period that extends or moves the intermittent reception period from the overlap period. Or, by notifying, it is avoided to notify the mobile station apparatus of the extension period again when overlapping.
  • FIG. 3 shows another example in which the states of the timer are shown together.
  • FIG. 3 shows the 1st example which makes an extension period the period which does not contain a MBMS sub-frame.
  • the 2nd example which makes an extended period the period which does not contain a MBMS sub-frame.
  • FIG. 1 is a functional block diagram showing a configuration example of a base station apparatus according to an embodiment of the present invention.
  • the base station apparatus 100 includes a data control unit 101, an OFDM modulation unit 102, a radio unit 103, a scheduling unit 104, and an upper layer 105.
  • the data control unit 101 receives input of control data, user data, and MBMS data from the scheduling unit 104, and transmits control data to a downlink control channel and a downlink broadcast channel based on scheduling information input from the scheduling unit 104. And mapped to the downlink shared channel. Further, user data for the mobile station apparatus is mapped to a downlink shared channel (PDSCH). The MBMS data is mapped to the downlink multicast channel. Each mapped data is output to OFDM modulation section 102.
  • PDSCH downlink shared channel
  • the information regarding the MBMS subframe arrangement pattern and DRX is mapped to the downlink shared channel and transmitted to the mobile station apparatus.
  • the OFDM modulation unit 102 performs data modulation, serial / parallel conversion of input signals, IFFT (Inverse Fast Fourier Transform) processing, CP (Cyclic Prefix) insertion on the data input from the data control unit 101
  • OFDM signal processing such as filtering is performed to generate an OFDM signal and output it to the radio section 103.
  • Radio section 103 up-converts the modulation data input from OFDM modulation section 102 to a radio frequency to generate a radio signal, and transmits the radio signal to a mobile station apparatus via an antenna (not shown).
  • the scheduling unit 104 performs transmission signal scheduling.
  • a schedule for MBMS data transmission is instructed by the upper layer 105.
  • the user data and control data for the mobile station apparatus are adjusted with the user data for other mobile station apparatuses in consideration of the amount of user data transmitted from the upper layer 105 and the availability of radio resources. Schedule.
  • the scheduling information is output to the data control unit 101.
  • the mobile station apparatus repeats an on-duration and a DRX opportunity (opportunity for DRX) at DRX cycle (repetition period) intervals.
  • DRX cycle repetition period
  • the ON period and the DRX cycle are specified, the DRX opportunity is uniquely determined.
  • This ON period is a period composed of one subframe or a plurality of subframes that are determined so that the mobile station apparatus monitors the PDCCH.
  • the base station apparatus transmits the PDCCH to start uplink or downlink resource allocation in the on period.
  • an On-duration Timer (on period timer) is activated, and the PDCCH is monitored until an expiration value (expire value) is reached.
  • the mobile station apparatus that has received the PDCCH indicating scheduling of uplink or downlink initial transmission data (new data) monitors the PDCCH for a certain period exceeding the on period.
  • DRX Inactivity Timer intermittent reception inactivity timer is used for this fixed period of computation.
  • the mobile station apparatus that has received the PDCCH indicating scheduling of uplink or downlink initial transmission data (new data) in the ON period activates DRX Inactivity Timer and the expiration value of DRX Inactivity Timer specified by the base station device PDCCH is monitored until
  • the mobile station apparatus monitors the PDCCH regardless of the on period.
  • HARQ RTT Timer hybrid automatic retransmission request round trip time timer
  • DRX Retransmission Timer intermittent reception retransmission timer
  • the mobile station apparatus activates the receiving unit, and the period in which the mobile station apparatus is awake is called an active period (Active (Time).
  • DRX InactivityrTimer or DRX Retransmission Timer or On-duration Timer keeps timing.
  • the base station device transmits data while the mobile station device is active.
  • the base station apparatus notifies the mobile station apparatus in advance of the repetition period and ON period of the DRX cycle, and the mobile station apparatus periodically repeats power-on in advance based on the information and the reception status of the PDCCH and data Power on according to the retransmission status.
  • the method of extending the activity period includes a method of extending the on period or the activity period when the MBMS subframe and the on period collide, and a method of extending the activity period when the MBMS subframe and the activity period collide. There is.
  • control is performed depending on whether the On-duration Timer, DRX Inactivity Timer, and DRX Retransmission Timer are counted up.
  • the extension period there are a method of handling the MBMS subframe as a DRX opportunity and a method of continuously monitoring the MBMS subframe.
  • FIG. 2 is a timing chart when the active period in the DRX control is extended when the ON period and the MBMS transmission subframe overlap.
  • the mobile station apparatus is notified in advance of the DRX cycle and the length of the on period from the base station apparatus.
  • an MBMS subframe arrangement pattern (MSAP) indicating the arrangement of subframes (MBMS subframes) set as the MBMS service may be provided is also notified.
  • the extension amount when the MBMS service and the ON period in the DRX control overlap is notified.
  • the DRX cycle of the mobile station apparatus is 20 subframes (20 ms)
  • the ON period is 2 subframes (2 ms)
  • the extension amount (indicated by arrow AR1) when overlapping is 3 subframes (3 ms).
  • the base station apparatus transmits data in subframe 1 every other radio frame accordingly. Although normal data is transmitted in one subframe, the ON period is usually set longer than this in consideration of the return accuracy during intermittent reception of the mobile station apparatus.
  • the subframe at this time Since the data (D1) for the mobile station apparatus to be transmitted in the frame 1 cannot be transmitted because the MBMS service is provided, the data is transmitted in the subframe 4 which is a subframe not provided for the next MBMS service ( D2).
  • the mobile station apparatus performs DRX and receives data based on the DRX cycle and on-period information notified from the base station apparatus, but the MBMS subframe arrangement pattern is notified. Therefore, it knows in which subframe the DRX and the MBMS service overlap. At this timing, the mobile station apparatus extends the on time based on the extension amount of the on time in the DRX control notified from the base station apparatus or the number of subframes in which the MBMS subframe overlaps with the on time (reference AR1). ) Perform DRX. Thereby, even the data transmitted by the base station apparatus out of the original time can be received.
  • the data transmission is shifted backward to extend the ON period in the DRX control.
  • the transmission is moved to a subframe in which the previous MBMS service is not performed, and the DRX control is turned on.
  • the period may be extended before.
  • the ON period in DRX control may be extended back and forth.
  • FIG. 3 An example in which the on-time is extended back and forth (arrows AR2, 3) is shown in FIG.
  • data transmission can be performed by moving the data from D1 to D4 to the front side.
  • the extension amount of the activity period in the DRX control may be calculated as a period including the MBMS subframe in the extended period, or may be calculated as a period not including the MBMS subframe.
  • the ON period timer (On-duration Timer) counts up even in the MBMS subframe, and expires when the on period is the MBMS subframe.
  • the value increases for example, the number of subframes in which the ON period and the MBMS subframe overlap each other is added to the set expiration value, or a predetermined value (set in the specification or set from the base station apparatus) is added. Added to the expiration value).
  • the on-time is extended when the on-period is an MBMS subframe.
  • the extension of the on period (AR4) is also an extension of the activity period.
  • the activity period here refers to a period during which the DRX Inactivity Timer, the DRX Retransmission Timer, or the On-duration Timer is counting.
  • FIG. 4 is a diagram showing the states of these timers together.
  • the on-time timer of the timer is extended for the time period counted by the addition of the expiration value.
  • the time measurement means counting the number of subframes in units of subframes.
  • Another method is to prepare MBMS Extend ⁇ Timer (MBMS extension timer) separately from On-duration Timer and set the number of sub-frames in which the ON period and MBMS sub-frames overlap or a predetermined number (set or set in the specification).
  • the value set from the base station apparatus is set as the expiration value of MBMSMBExtend Timer.
  • the On-duration Timer encounters an MBMS subframe
  • the MBMS Extend Timer is started immediately after the On-duration Timer expires, and the mobile station device continues to use the PDCCH while the MBMS Extend Timer is timing. Monitor.
  • the On-duration Timer and MBMS Extend Timer also count up in MBMS subframes.
  • the activity period refers to a period in which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is timing.
  • FIG. 5 shows the states of these timers together.
  • the mobile station apparatus only has to extend the activity period in the DRX control only during the period determined as the extension amount, and there is an advantage that the processing becomes simple.
  • the On-duration Timer is not counted up in the MBMS subframe.
  • the subframe reaching the expiration value is postponed (AR6), and the on-time is extended.
  • the transmission timing is also changed from D1 to D5.
  • AR6 the extension of the on period is also the extension of the activity period.
  • the activity period here refers to a period during which the DRX Inactivity Timer, the DRX Retransmission Timer, or the On-duration Timer is counting.
  • FIG. 6A shows the states of these timers together.
  • an MBMS Extend Timer (MBMS extension timer) is prepared separately from the On-duration Timer, and the number of sub-frames where the ON period and the MBMS sub-frame overlap each other or predetermined
  • the value (set by specification or set from the base station device) is set as the expiration value of MBMS Extend Timer.
  • An MBMS subframe is encountered while the On-duration Timer is running, and the MBMS Extend Timer is started immediately after the On-duration Timer expires, and the mobile station device monitors the PDCCH while the MBMS Extend Timer is running. To do.
  • On-durationrTimer is also counted up in the MBMS subframe, but MBMS Extend Extension Timer is not counted up in the MBMS subframe (indicated by a dotted line). Accordingly, when the ON period overlaps with the MBMS subframe, the active time is extended (AR7).
  • the activity period refers to a period in which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is timing.
  • the actual extension period varies depending on the number of MBMS subframes included in the period indicated as the extension period, but the mobile station apparatus knows in advance when and when the MBMS subframe exists. So there is no inconvenience.
  • the base station apparatus since the base station apparatus actually transmits data to be sent in a period overlapping with the MBMS subframe after the subframe that is not the next MBMS subframe, the base station apparatus overlaps regardless of the number of consecutive MBMS subframes. There is an advantage that the receiving side can receive data of a certain period.
  • FIG. 7 shows these examples again.
  • the extension amount of MBMS MBExtend Timer is 3 subframes.
  • the upper diagram showing the state of DRX is an example in which the extended period (AR8) is a period including MBMS subframes (in this case, three subframes).
  • the extended period (AR8) is a period including MBMS subframes (in this case, three subframes).
  • data to be transmitted in D1 is transmitted in 4 which is the next subframe excluding MBMS subframes 1 to 3 (D7).
  • the activity period is always extended by 3 subframes regardless of the arrangement of MBMS subframes.
  • the lower diagram is a diagram illustrating an example in which the extended period is a period not including the MBMS subframe.
  • the active period in the DRX control is extended so that a period not including the MBMS subframe is always included in the extended active period (AR9).
  • the position indicated by D8 is the data transmission position.
  • FIG. 8 is a diagram showing such an example.
  • the ON period overlaps with the MBMS transmission subframe
  • the DRX period is extended by 3 subframes without including the MBMS transmission subframe (AR10), and the transmitting side transmits the overlapped data between them.
  • data is originally transmitted in subframe 1 (D1), which overlaps with the MBMS subframe, and therefore within 3 subframes that are not subsequent MBMS subframes, that is, 3, 5, It is assumed that transmission is performed in 9 subframes.
  • the activity period is extended to 9 subframes. Since it is continuous, the active period in DRX control becomes long and the power consumption increases. Therefore, when MBMS subframes continue for a certain period or longer (here, MBMS subframes from 6 to 8), power consumption can be suppressed by stopping the extension of the active period in DRX control during that period. Thereafter, in 9 subframes, the mobile station apparatus again becomes an active period in the DRX control.
  • MBMS DRX Timer (MBMS DRX timer) is prepared.
  • the MBMS DRX timer measures time to temporarily suspend the active period during the period when MBMS subframes during the active period overlap.
  • the MBMS Extend Timer is started immediately after the On-duration Timer expires.
  • the mobile station apparatus also checks the number of consecutive MBMS subframes and the position thereof from the received MSAP information, and the number of consecutive frames is determined in advance (set in the specification or set from the base station apparatus.
  • the MBMS DRX Timer is started from the continuous position of the MBMS subframe with the continuous number as the expiration value.
  • the mobile station device monitors the PDCCH while the MBMS Extend Timer is counting, but when the MBMS DRX Timer is operating, it temporarily suspends the activity period even when the MBMS Extend Timer is operating (non-count-up unit, that is, dotted line) Part reference). Thereafter, when the MBMS DRX Timer expires, the mobile station apparatus returns to the active period (“9” subframe).
  • On-duration Timer and MBMS DRX Timer are also counted up in the MBMS subframe, but MBMS Extend Timer is not counted up in the MBMS subframe.
  • the activity period here refers to the period during which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is running and the MBMS DRX Timer is not running.
  • FIG. 10 is a diagram illustrating an example of another method.
  • an On-duration Timer and an MBMS Extension Timer (MBMS extension timer)
  • MBMS extension limit timer MBMS Extension Limit Timer
  • the MBMS Extend Timer and MBMS Extend Limit Timer are started.
  • the mobile station apparatus monitors the PDCCH while the MBMS Extend Timer is timing.
  • the MBMS Extend Timer is stopped (extension abort) when the MBMS Extend Limit Timer expires (the end point of the arrow of AR14).
  • DRX is also extended to the same time as indicated by AR13.
  • the transmission data that was supposed to be transmitted in D1 is transmitted in 4 subframes as shown in D10.
  • the MBMS Extend Limit Timer is stopped when the MBMS Extend Timer expires (extension abort). That is, the expiration value of MBMS Extend Limit Timer is set as a limit value that limits the activity period so that it does not become too long.
  • the On-duration Timer and MBMS Extend Limit Timer are counted up in the MBMS subframe, but the MBMS Extend Timer is not counted up in the MBMS subframe as shown by the broken line.
  • the activity period refers to a period in which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is timing. In the example shown in FIG. 8, only 9 subframes are in the active period in DRX control again. However, in consideration of the accuracy at the time of intermittent reception by the mobile station apparatus, an extra subframe active period is taken. May be.
  • FIG. 11 is a diagram illustrating an example of a communication technique according to another embodiment of the present invention.
  • the activity period in DRX control is shifted.
  • the upper DRX state is an example when the shift is not performed, and the lower DRX state is an example when the shift is performed. That is, when it overlaps with the MBMS subframe at the beginning of the DRX cycle, the On-duration Timer is not started, but waits for the next subframe not for MBMS (unicast subframe) (AR15), and the On-duration Timer Start up.
  • the data that should have been transmitted in D1 can be transmitted in the first subframe (D11) of the moved DRX period.
  • control is performed without extending the DRX period, so that an increase in power consumption of the mobile station apparatus can be suppressed.
  • the shift amount of the active period in the DRX control may be considered as a period including the MBMS subframe, or may be considered as a period not including the MBMS subframe, as in the case of extending. Furthermore, when the period in which MBMS subframes are continuous is short and includes an MBMS subframe, the MBMS subframe period may be temporarily inactive.
  • FIG. 12 is a diagram showing an example of a communication technique according to another embodiment of the present invention, and controls the active period in the DRX control so that it is always performed at the position after the shift.
  • control is performed so that the DRX time is shifted only when it overlaps the MBMS subframe.
  • transmission is performed in the shifted time even in the subframes after overlapping, and the active time in the DRX control is also performed in the shifted time.
  • the MBMS subframe arrangement pattern may be changed by changing the MBMS service.
  • FIG. 12 shows an example in which the MBMS service is performed every 4 radio frames (40 ms), and the MBMS arrangement pattern in the MBMS subframe changes in the middle.
  • the active period in DRX control is initially set to subframes 0 and 1 every two radio frames (20 ms) in synchronization with the cycle of the MBMS subframe arrangement pattern.
  • the active period in the DRX control is matched with a subframe without an MBMS subframe.
  • the arrangement pattern of the MBMS subframe is reset, so that it overlaps with the DRX period. .
  • the activity period in the DRX control is shifted, but this is repeated every 4 radio frames (40 ms) thereafter.
  • shifting is performed so as not to overlap with the MBMS subframe, and thereafter, the timing (subframes 4 and 5 in FIG. 12) is set as the active period in the DRX control. It is possible to avoid overlapping the subframe.
  • the mobile station apparatus since the timing for rearranging the MBMS subframe and information for the rearrangement are normally transmitted to the mobile station apparatus in advance, the mobile station apparatus determines the start timing of the shift of the active period in the DRX control. This can be performed in accordance with the timing of frame rearrangement.
  • the active period in the DRX control is extended when the ON period overlaps with the MBMS transmission subframe has been described.
  • the active period and the MBMS transmission subframe include A case where the activity period in the DRX control is extended in the case of overlapping will be described.
  • DRX is performed based on the DRX cycle and on-period information notified from the base station device, and data is received. Since the mobile station apparatus side is notified of the MBMS subframe arrangement pattern, it knows in which subframe the DRX and the MBMS service overlap. At this timing, the activity period is extended and DRX is performed. As a result, it is possible to receive even data transmitted by the base station apparatus out of the original time. That is, On-duration Timer, DRX Inactivity Timer, and DRX Retransmission Timer are not counted up in the MBMS subframe. This postpones the subframe that reaches the expiration value and prolongs the activity time.
  • FIG. 13 is a diagram illustrating an example of extending the activity period when MBMS subframes overlap during the operation of DRX Inactivity Timer.
  • the mobile station device After receiving the PDCCH, the mobile station device starts DRX Inactivity Timer and monitors the PDCCH until the expiration value of DRX Inactivity Timer designated by the base station device is exceeded.
  • DRX Inactivity Timer 3 subframes are designated as the expiration value of DRX Inactivity Timer will be described as an example. If MBMS transmission subframes overlap during this period (D1), the DRX Inactivity Timer is not counted up (start of the non-counting period indicated by the broken line: AR19), thereby extending the monitoring period after receiving the PDCCH. (AR17).
  • the base station apparatus performs data transmission during this extended period.
  • the PDCCH needs to be received during the on-period or activity period (that is, on-duration timer, DRX Inactivity Timer, DRX Retransmission Timer timing).
  • the on-period timer defines an on-period. In the embodiment shown in FIG. 13, the period is a fixed value regardless of the presence / absence of an MBMS subframe and the presence / absence of a PDCCH. Start and end at time. DRX Inactivity Timer and DRX Retransmission Timer are involved in extending the activity period. If the PDCCH is received in the meantime, the DRX Inactivity Timer is reset again to start counting up from the beginning, and as a result, the monitoring period (activity period) is extended.
  • the activity period can be extended even when it overlaps with the MBMS transmission subframe.
  • the activity period is set by, for example, introducing MBMS Extend Timer in the same manner as described for extending the activity period in DRX control. It may be extended.
  • the on period, the amount of extension of the activity period, the expiration value of the MBMS Extended Timer, the increase value of the expiration value, the presence / absence of counting up of each timer when overlapping with the subframe of MBMS transmission, etc. It may be a predetermined value or may be notified from the base station apparatus to the mobile station apparatus, but may be determined according to the arrangement pattern of the MBMS service period. For example, when the arrangement density of the MBMS service period is large, by increasing the increase value of the expiration value of the on period and the activity period, the data is set so that many unicast subframes are included in the extended activity period. Transmission and reception opportunities can be increased. At this time, by determining the method for deriving these values in common between the transmission device and the reception device, even when the MBMS service period arrangement pattern is changed, the base station device can notify the mobile station device. It can be omitted.
  • the present invention can be used for communication devices.

Abstract

Provided is a base station device comprising a scheduling means for scheduling a data transmitting period according to the intermittent reception period of a receiver. The scheduling means has functions to assign an MBMS service period and an action period of the receiver in an overlapping manner and to perform the transmission, when the MBMS service period and a data transmission period to the receiver overlap, by moving the data transmission period to the receiver, out of the MBMS service period. Also provided is a mobile station device for intermittent receptions, which has a function to perform receptions, when the intermittent reception period and the MBMS service period overlap, by enlarging the intermittent reception period. Alternatively, the scheduling means has a function to perform the transmission, when the MBMS service period and a data transmission period to the receiver overlap, by moving the subsequent data transmission period to the receiver, out of the MBMS service period. The mobile station device for intermittent receptions has a function to perform receptions, when the intermittent reception period and the MBMS service period overlap, by enlarging the subsequent intermittent reception period. Further provided is a system for performing the MBMS service with a mixed cell, which can avoid that the data cannot be transmitted for the action period in a DRX control of the mobile station device when the period for the MBMS service and the action period for the DRX control overlap.

Description

通信システム、基地局装置、移動局装置Communication system, base station apparatus, mobile station apparatus
　本発明は、通信システム、基地局装置、移動局装置に関し、特にミクスドセルでＭＢＭＳサービスを行い、移動局装置側で間欠受信方式をする通信技術に関する。 The present invention relates to a communication system, a base station apparatus, and a mobile station apparatus, and more particularly to a communication technique that performs an MBMS service in a mixed cell and performs an intermittent reception method on the mobile station apparatus side.
　現在、進化した第三世代無線アクセス（Ｅｖｏｌｖｅｄ　Ｕｎｉｖｅｒｓａｌ　Ｔｅｒｒｅｓｔｒｉａｌ　Ｒａｄｉｏ　Ａｃｃｅｓｓ、以下、「ＥＵＴＲＡ」と称する。）及び進化した第三世代無線アクセスネットワーク（Ｅｖｏｌｖｅｄ　Ｕｎｉｖｅｒｓａｌ　Ｔｅｒｒｅｓｔｒｉａｌ　Ｒａｄｉｏ　Ａｃｃｅｓｓ　Ｎｅｔｗｏｒｋ、以下、「ＥＵＴＲＡＮ」と称する。）が検討されている。 Currently evolved third generation radio access (Evolved Universal Terrestrial Radio Access, hereinafter referred to as “EUTRA”) and evolved third generation radio access network (hereinafter referred to as Evolved Universal Terrestrial Radio Access, hereinafter referred to as “Evolved Universal Radio Access,” hereinafter referred to as “Evolved Universal Terrestrial Radio Network,” hereinafter referred to as “EUTRA. ) Is being considered.
　図１４は、ＥＵＴＲＡにおけるチャネル構成例を示す図である。ＥＵＴＲＡの下りリンク（基地局から移動局への通信）は、下りリンクマルチキャストチャネル（ＰＭＣＨ：Ｐｈｙｓｉｃａｌ　Ｍｕｌｔｉｃａｓｔ　Ｃｈａｎｎｅｌ）と、下りリンク共用チャネル（ＰＤＳＣＨ：Ｐｈｙｓｉｃａｌ　Ｄｏｗｎｌｉｎｋ　Ｓｈａｒｅｄ　Ｃｈａｎｎｅｌ）と、下りリンク制御チャネル（ＰＤＣＣＨ：Ｐｈｙｓｉｃａｌ　Ｄｏｗｎｌｉｎｋ　Ｃｏｎｔｒｏｌ　Ｃｈａｎｎｅｌ）、下りリンク報知チャネル（ＰＢＣＨ：Ｐｈｙｓｉｃａｌ　Ｂｏｒａｄｃａｓｔ　Ｃｈａｎｎｅｌ）、により構成されている。 FIG. 14 is a diagram illustrating a channel configuration example in EUTRA. The EUTRA downlink (communication from the base station to the mobile station) includes a downlink multicast channel (PMCH: Physical Multichannel), a downlink shared channel (PDSCH: Physical Downlink Shared Channel), and a downlink control channel (PDCCH: It consists of a Physical Downlink Control Channel) and a downlink broadcast channel (PBCH: Physical Boradcast Channel).
　また、ＥＵＴＲＡの上りリンク（移動局から基地局への通信）は、ランダムアクセスチャネル（ＲＡＣＨ：Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｃｈａｎｎｅｌ）、上りリンク共用チャネル（ＰＵＳＣＨ：Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｓｈａｒｅｄ　Ｃｈａｎｎｅｌ）、上りリンク制御チャネル（ＰＵＣＣＨ：Ｐｈｙｓｉｃａｌ　Ｕｐｌｉｎｋ　Ｃｏｎｔｒｏｌ　Ｃｈａｎｎｅｌ）、により構成されている（例えば、下記非特許文献１参照）。 In addition, the uplink of EUTRA (communication from a mobile station to a base station) includes a random access channel (RACH: Random Access Channel), an uplink shared channel (PUSCH: Physical Uplink Shared Channel), and an uplink control channel (PUCCH: Physical). Uplink Control Channel) (for example, see Non-Patent Document 1 below).
　図１５は、ＥＵＴＲＡにおける下りリンクにおけるフレーム構成の一例を示す図である（下記非特許文献２参照）。移動局装置へのデータの送信は、サブフレーム（＃０から＃９までのそれぞれ１ｍｓ）単位で行なわれる。１０個のサブフレームをまとめてラジオフレームと称する。図では、ラジオフレームＦ１１、Ｆ１２（１０ｍｓ単位）が示されている。 FIG. 15 is a diagram illustrating an example of a frame configuration in the downlink in EUTRA (see Non-Patent Document 2 below). Data transmission to the mobile station apparatus is performed in units of subframes (1 ms each from # 0 to # 9). Ten subframes are collectively referred to as a radio frame. In the figure, radio frames F11 and F12 (10 ms units) are shown.
＜ＭＢＭＳについて＞
　現在、ＥＵＴＲＡに関する議論において、ＭＢＭＳ（Ｍｕｌｔｉｍｅｄｉａ　Ｂｏｒａｄｃａｓｔ　Ｍｕｌｔｉｃａｓｔ　Ｓｅｒｖｉｃｅ：マルチメディア放送同報サービス）サービスが検討されている。ＭＢＭＳサービスは、複数のセルにまたがり、同一時刻に同一周波数で同報サービスを提供するものである。ＭＢＭＳサービスを提供するセルとしては、ユニキャスト送信（単一セルから個々の受信装置へ向けての送信）のために利用される周波数と異なる周波数を利用してＭＢＭＳ送信を専門に行うセル（ＭＢＭＳ　Ｄｅｄｉｃａｔｅｄ　Ｃｅｌｌ）と、ユニキャスト送信のために利用される周波数を利用してＭＢＭＳ送信とユニキャスト送信の双方を行うミックスドセル（ＭＢＭＳ／Ｕｎｉｃａｓｔ－ｍｉｘｅｄ　Ｃｅｌｌ）との２つのセルがあり、２つのセルのいずれかを用いて、複数ユーザに対して同時にＭＢＭＳサービスを提供する。ＭＢＭＳ送信とユニキャスト送信の双方を行うミックスドセルの場合、ＭＢＭＳ送信とユニキャスト送信とは時分割で共用される（例えば、下記非特許文献２参照）。図１６はミックスドセルの配置例を示す図である。図１６に示すように、１０のＭＢＭＳサブフレームからなる１ラジオフレーム中の、どのサブフレームをＭＢＭＳサービスに使用するかが定められており、かつ、そのＭＢＭＳサービスを含むラジオフレームをどのような間隔で繰り返すかが定められている。この配置情報はＭＢＭＳサブフレーム配置パターン（ＭＢＭＳ　Ｓｕｂｆｒａｍｅ　Ａｌｌｏｃａｔｉｏｎ　Ｐａｔｔｅｒｎ：ＭＳＡＰ）と呼ばれ、基地局装置より移動局装置へ予めこのパターンが通知されている。従って、移動局装置では、どのサブフレームにおいてＭＢＭＳサービスが実施されるのかを知ることが出来る。このＭＢＭＳサブフレーム配置パターンによって、ＭＢＭＳサービスが提供されるかもしれないとして設定されているサブフレームを、ＭＢＭＳサブフレームと呼ぶ。ＭＢＭＳサブフレームにおいては、個々の受信端末に向けたデータの送信を行う場合もある。図１６では、“１”、“２”、“４”、“６”、“７”、“８”、“９”がＭＢＭＳサブフレームとなっている（斜線で示されているサブフレームである）。 <About MBMS>
Currently, in the discussion about EUTRA, MBMS (Multimedia Boradcast Multicast Service) service is being studied. The MBMS service is a service that provides a broadcast service over a plurality of cells at the same time and at the same frequency. As a cell that provides an MBMS service, a cell (MBMS) that specializes in MBMS transmission using a frequency different from the frequency used for unicast transmission (transmission from a single cell to individual receivers). There are two cells, a Dedicated Cell) and a mixed cell (MBMS / Unicast-mixed Cell) that performs both MBMS transmission and unicast transmission using a frequency used for unicast transmission. Any one of the above is used to simultaneously provide an MBMS service to a plurality of users. In the case of a mixed cell that performs both MBMS transmission and unicast transmission, MBMS transmission and unicast transmission are shared in a time division manner (for example, see Non-Patent Document 2 below). FIG. 16 is a diagram illustrating an arrangement example of mixed cells. As shown in FIG. 16, it is determined which subframe is used for the MBMS service in one radio frame composed of 10 MBMS subframes, and what interval is used for the radio frame including the MBMS service. It is decided whether or not to repeat. This arrangement information is called an MBMS subframe allocation pattern (MBSAP), and this pattern is notified from the base station apparatus to the mobile station apparatus in advance. Therefore, the mobile station apparatus can know in which subframe the MBMS service is implemented. A subframe that is set as an MBMS service may be provided by this MBMS subframe arrangement pattern is called an MBMS subframe. In the MBMS subframe, data may be transmitted to individual receiving terminals. In FIG. 16, “1”, “2”, “4”, “6”, “7”, “8”, “9” are MBMS subframes (subframes indicated by hatching). ).
＜間欠受信について＞
　一方、移動局装置の消費電力を抑えるために、移動局装置が必要な期間のみパワーオンして信号を受信するＤＲＸ（Ｄｉｓｃｏｎｔｉｎｕｏｕｓ　Ｒｅｃｅｐｔｉｏｎ：間欠受信）と呼ばれる手法がある。 <About intermittent reception>
On the other hand, in order to suppress the power consumption of the mobile station apparatus, there is a technique called DRX (Discontinuous Reception) in which the mobile station apparatus is powered on for a necessary period and receives a signal.
　図１７は、ＤＲＸ制御技術の概要を示す図である。図１７に示すように、移動局装置は、ＤＲＸサイクル（繰返し周期）間隔で、オン期間（on-duration）とＤＲＸ機会(opportunity for DRX)とを繰り返す。オン期間とＤＲＸサイクルが指定されるとＤＲＸ機会は一意に定まる。オン期間は、移動局装置がＰＤＣＣＨをモニタリングするように定められている１サブフレームまたは複数サブフレームで構成される期間である。 FIG. 17 is a diagram showing an outline of the DRX control technology. As shown in FIG. 17, the mobile station apparatus repeats an on-duration and a DRX opportunity (opportunity for DRX) at DRX cycle (repetition period) intervals. When the ON period and the DRX cycle are specified, the DRX opportunity is uniquely determined. The on period is a period composed of one subframe or a plurality of subframes in which the mobile station apparatus is determined to monitor the PDCCH.
　基地局装置は、オン期間において、上りリンクまたは下りリンクのリソース割当てを開始するため、ＰＤＣＣＨを送信する。オン期間において、上りリンクまたは下りリンクの初期送信データ（新データ）のスケジューリングを示すＰＤＣＣＨ（白抜きの矢印で示される）を受信した移動局装置は、オン期間を超えてある一定期間ＰＤＣＣＨをモニタリングする（ＰＤＣＣＨ受信後のモニタリング期間）。 The base station apparatus transmits a PDCCH in order to start uplink or downlink resource allocation in the on period. In the on period, the mobile station apparatus that has received the PDCCH (indicated by a white arrow) indicating the scheduling of uplink or downlink initial transmission data (new data) monitors the PDCCH for a certain period exceeding the on period. (Monitoring period after receiving PDCCH).
　また、上りリンクデータまたは下りリンクデータのハイブリッド自動再送要求（ＨＡＲＱ）における再送の可能性のある期間においては、移動局装置は、オン期間であるか否かに関わらず、ＰＤＣＣＨをモニタリングする。これらＰＤＣＣＨをモニタリングするために、移動局装置が受信部を起動し、受信部が起きている状態の期間を活動期間(Active Time)と称する。 In addition, in a period in which retransmission is possible in the hybrid automatic retransmission request (HARQ) of uplink data or downlink data, the mobile station apparatus monitors the PDCCH regardless of whether it is an on period. In order to monitor these PDCCHs, a period in which the mobile station apparatus activates the reception unit and the reception unit is awake is referred to as an active period (Active Time).
　基地局装置は、移動局装置が活動期間の間にデータを送信する。基地局装置から移動局装置へは、あらかじめＤＲＸサイクルの繰返し周期およびオン期間が通知され、移動局装置はその情報を基に、あらかじめ周期的にパワーオンを繰り返すとともに、ＰＤＣＣＨの受信状況、および、データの再送状況に応じてパワーオンする（非特許文献３参照）。
３ＧＰＰ　ＴＳ　（Ｔｅｃｈｎｉｃａｌ　Ｓｐｅｃｉｆｉｃａｔｉｏｎ）　３６．３００　Ｖ８．３．０　（２００７－１２），　Ｅｖｏｌｖｅｄ　Ｕｎｉｖｅｒｓａｌ　Ｔｅｒｒｅｓｔｒｉａｌ　Ｒａｄｉｏ　Ａｃｃｅｓｓ　（ＥＵＴＲＡ）　ａｎｄ　Ｅｖｏｌｖｅｄ　Ｕｎｉｖｅｒｓａｌ　Ｔｅｒｒｅｓｔｒｉａｌ　Ｒａｄｉｏ　Ａｃｃｅｓｓ　Ｎｅｔｗｏｒｋ　（ＥＵＴＲＡＮ）；　Ｏｖｅｒａｌｌ　ｄｅｓｃｒｉｐｔｉｏｎ；　Ｓｔａｇｅ２　（Ｒｅｌｅａｓｅ　８） ３ＧＰＰ　ＴＳＧ－ＲＡＮ　ＷＧ２　＃６０ｂｉｓ　Ｒ２－０８０１９８　Ｓｉｇｎａｌｉｎｇ　ｏｆ　ＭＢＳＦＮ　Ｓｕｂｆｒａｍｅ　Ａｌｌｏｃａｔｉｏｎｓ　Ｓｅｖｉｌｌａ，　Ｊａｎｕａｒｙ　１４　－　１８，　２００８ ３ＧＰＰ　ＴＳ　３６．３２１　Ｖ８．０．０　（２００７－１２）　Ｔｅｃｈｎｉｃａｌ　Ｓｐｅｃｉｆｉｃａｔｉｏｎ　３ｒｄ　Ｇｅｎｅｒａｔｉｏｎ　Ｐａｒｔｎｅｒｓｈｉｐ　Ｐｒｏｊｅｃｔ；　Ｔｅｃｈｎｉｃａｌ　Ｓｐｅｃｉｆｉｃａｔｉｏｎ　Ｇｒｏｕｐ　Ｒａｄｉｏ　Ａｃｃｅｓｓ　Ｎｅｔｗｏｒｋ；Ｅｖｏｌｖｅｄ　Ｕｎｉｖｅｒｓａｌ　Ｔｅｒｒｅｓｔｒｉａｌ　Ｒａｄｉｏ　Ａｃｃｅｓｓ　（Ｅ－ＵＴＲＡ）　Ｍｅｄｉｕｍ　Ａｃｃｅｓｓ　Ｃｏｎｔｒｏｌ　（ＭＡＣ）　ｐｒｏｔｏｃｏｌ　ｓｐｅｃｉｆｉｃａｔｉｏｎ　（Ｒｅｌｅａｓｅ　８） The base station device transmits data while the mobile station device is active. From the base station apparatus to the mobile station apparatus, the repetition period and ON period of the DRX cycle are notified in advance, and the mobile station apparatus periodically repeats power-on in advance based on the information, and the reception status of PDCCH, The power is turned on according to the data retransmission status (see Non-Patent Document 3).
3GPP TS (Technical Specification) 36.300 V8.3.0 (2007-12), Evolved Universal Terrestrial Radio Access (EUTRA) and Evolved Universal Terrestrial Radio Access Network (EUTRAN); Overall description; Stage2 (Release 8) 3GPP TSG-RAN WG2 # 60bis R2-080198 Signaling of MBSFN Subframe Allocations Severa, January 14-18, 2008 3GPP TS 36.321 V8.0.0 (2007-12) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification (Release 8 )
　ＤＲＸ制御を行う場合に、基地局装置のデータ送信タイミングと、移動局装置の活動期間と、を一致させる必要がある。ＤＲＸサイクルやオン期間等の時間情報は、基地局装置からあらかじめ通知され、その情報とＰＤＣＣＨの受信状況とに従って、移動局装置は、活動期間とＤＲＸ機会とを柔軟的に制御する。ＥＵＴＲＡにおいては、このように最小限の情報を通知することにより、ＤＲＸを可能としている。 When performing DRX control, it is necessary to match the data transmission timing of the base station apparatus with the activity period of the mobile station apparatus. Time information such as the DRX cycle and the ON period is notified in advance from the base station apparatus, and the mobile station apparatus flexibly controls the activity period and the DRX opportunity according to the information and the reception status of the PDCCH. In EUTRA, DRX is enabled by notifying such minimum information.
　一方、ミクスドセルでＭＢＭＳサービスを行っている場合には、ＭＢＭＳサービスを行なう期間と、移動局装置のＤＲＸ制御における活動期間とが重なる場合には、基地局装置はＭＢＭＳサービスのみを送信するため、移動局装置へデータを送信することができない。そのため、通常は、ＭＢＭＳサブフレームの送信周期とＤＲＸサイクルとを同期させ、ＤＲＸ制御における活動期間がＭＢＭＳサブフレームと重ならないようにする。図１８は、この関係を示す図である。図１８に示すように、ＭＢＭＳサービスは、Ｆ１の次がＦ５というように４ラジオフレーム（４０ｍｓ）周期で行なわれ、そのラジオフレームＦ１、Ｆ５、Ｆ９、…では、サブフレーム１、２、３、６、７がＭＢＭＳサブフレームに割り当てられている。ＤＲＸサイクルは２０ｍｓで、２０ｍｓに２サブフレーム、ＤＲＸ制御におけるオン期間があるとする。この場合、移動局装置ＡのようにＭＢＭＳサブフレームの存在しないラジオフレームにＤＲＸ制御におけるオン期間が来るように配置すると、両者は重複することなく両立できる。また、移動局装置Ｂのように、ＭＢＭＳサブフレームの存在するラジオフレームにＤＲＸ制御におけるオン期間が来るように配置する場合であっても、ＭＢＭＳサブフレームの存在しないサブフレームにＤＲＸ制御におけるオン期間が来るように配置することにより、両者は重複することなく両立できる。 On the other hand, when the MBMS service is performed in the mixed cell, the base station apparatus transmits only the MBMS service when the period during which the MBMS service is performed overlaps with the active period in the DRX control of the mobile station apparatus. Data cannot be transmitted to the station device. Therefore, normally, the transmission period of the MBMS subframe and the DRX cycle are synchronized so that the active period in the DRX control does not overlap with the MBMS subframe. FIG. 18 is a diagram showing this relationship. As shown in FIG. 18, the MBMS service is performed in a cycle of 4 radio frames (40 ms) such that F1 follows F5. In the radio frames F1, F5, F9,. 6 and 7 are assigned to the MBMS subframe. The DRX cycle is 20 ms, and it is assumed that there are two subframes in 20 ms and an ON period in DRX control. In this case, when the mobile station apparatus A is arranged so that the on-period in the DRX control comes to a radio frame in which no MBMS subframe exists, both can be compatible without overlapping. Further, even when the radio frame in which the MBMS subframe exists is arranged such that the ON period in the DRX control comes like the mobile station apparatus B, the on period in the DRX control is set in the subframe in which the MBMS subframe does not exist. By arranging so as to come, both can be compatible without overlapping.
　しかしながら、移動局装置Ｃのような配置の場合は、ＭＢＭＳサブフレームの存在するサブフレームとＤＲＸ制御におけるオン期間とが重なっている。従って、ＭＢＭＳサブフレームの存在するサブフレームではデータを送信することが出来ず、データの欠落等となるため、このような配置とすることができない。すなわち、受信機にＤＲＸ制御におけるオン期間の割当を行なう際に、割当の自由度が制限されることとなる。 However, in the case of the arrangement like the mobile station apparatus C, the subframe in which the MBMS subframe exists and the ON period in the DRX control overlap. Accordingly, data cannot be transmitted in a subframe in which an MBMS subframe exists, and data cannot be transmitted. That is, when assigning the ON period in the DRX control to the receiver, the degree of freedom of assignment is limited.
　ここでは、ＭＢＭＳサブフレームの存在するラジオフレームをＤＲＸ制御における活動サイクル（２０ｍｓ）の２倍である４０ｍｓとした場合について説明したが、ＭＢＭＳサービスの頻度が少なくて、１６０ｍｓとした場合であっても、ＤＲＸ制御におけるオン期間を割当られる自由度は変わらない。すなわち、ＭＢＭＳサービスの頻度が低い場合は非効率となるという問題がある。 Here, the case where the radio frame in which the MBMS subframe exists is set to 40 ms, which is twice the activity cycle (20 ms) in the DRX control, has been described, but even when the frequency of the MBMS service is low and 160 ms is set. The degree of freedom to which the ON period in DRX control is assigned does not change. That is, there is a problem that inefficiency occurs when the frequency of MBMS service is low.
　また、移動局装置Ｃのような配置は、ＭＢＭＳのサービスを行なう配置パターンを再配置する際にも問題となる。ＭＢＭＳサービスの量が変化する場合に、無線リソースの有効利用のため、ＭＢＭＳサービスに割り当てるサブフレームを再配置する場合がある。ＭＢＭＳは複数のセルにおいて同一のサブフレーム配置パターンを使用してサービスが提供される。従って、それらのセルの中に含まれる、ＤＲＸ制御を行なう受信端末の数は相当数となる。ＭＢＭＳのサブフレームを増加して再配置する場合に、それら全ての受信端末が使用していないサブフレームを確保するのは非常に難しいことである。 Also, the arrangement like the mobile station apparatus C becomes a problem when the arrangement pattern for performing the MBMS service is rearranged. When the amount of MBMS service changes, subframes allocated to the MBMS service may be rearranged for effective use of radio resources. MBMS is provided with services using the same subframe arrangement pattern in a plurality of cells. Therefore, the number of receiving terminals that perform DRX control included in these cells is considerable. When MBMS subframes are increased and rearranged, it is very difficult to secure subframes that are not used by all the receiving terminals.
　本発明は、間欠受信期間とＭＢＭＳサービス期間とが重複する場合であっても、データの送信を行い、かつ、移動局装置で受信できるようにする通信技術を提供することを目的とする。 The present invention has an object to provide a communication technique that allows data transmission and reception by a mobile station apparatus even when the intermittent reception period and the MBMS service period overlap.
　このような課題を解決するために、本発明による通信技術では、受信機の間欠受信期間に合わせてデータを送信する期間をスケジューリングするスケジューリング手段を有する基地局装置において、そのスケジュール手段は、ＭＢＭＳサービス期間と受信機の活動期間とを重複するように割りあて、ＭＢＭＳサービス期間と受信機へのデータ送信期間とが重複する場合には受信機へのデータ送信期間をＭＢＭＳサービス期間外に移動して送信を行う機能を有し、間欠受信を行なう移動局装置においては、間欠受信期間とＭＢＭＳサービス期間とが重複する場合には間欠受信期間を拡大して受信を行なう機能を有するものである。 In order to solve such a problem, in the communication technique according to the present invention, in a base station apparatus having scheduling means for scheduling a data transmission period in accordance with the intermittent reception period of the receiver, the scheduling means includes an MBMS service. If the MBMS service period and the data transmission period to the receiver overlap, the data transmission period to the receiver is moved outside the MBMS service period. A mobile station apparatus having a function of performing transmission and performing intermittent reception has a function of performing reception by expanding the intermittent reception period when the intermittent reception period and the MBMS service period overlap.
　前記スケジュール手段は、ＭＢＭＳサービス期間と受信機へのデータ送信期間とが重複する場合には以降の受信機へのデータ送信期間をＭＢＭＳサービス期間外に移動して送信を行う機能を有し、間欠受信を行なう移動局装置においては、間欠受信期間とＭＢＭＳサービス期間とが重複する場合には以降の間欠受信期間を拡大して受信を行なう機能を有するものである。 The scheduling means has a function of performing transmission by moving the data transmission period to the subsequent receiver outside the MBMS service period when the MBMS service period and the data transmission period to the receiver overlap. The mobile station apparatus that performs reception has a function of performing reception by expanding the subsequent intermittent reception period when the intermittent reception period and the MBMS service period overlap.
　さらに、基地局装置はＭＢＭＳサービス期間と受信機の間欠受信期間とが重複する場合に、重複期間から間欠受信期間を延長もしくは移動する延長期間もしくは移動期間とにあらかじめ定めておいた期間を使用するか、通知することで、重複する際に改めて延長期間を移動局装置へ通知することを避ける。 Furthermore, when the MBMS service period and the intermittent reception period of the receiver overlap, the base station apparatus uses a predetermined period as an extension period or a movement period that extends or moves the intermittent reception period from the overlap period. Or, by notifying, it is avoided to notify the mobile station apparatus of the extension period again when overlapping.
　本発明によれば、間欠受信期間とＭＢＭＳサービス期間とが重複する場合であっても、データの送信を行い、かつ移動局装置で受信できる。 According to the present invention, even when the intermittent reception period and the MBMS service period overlap, data can be transmitted and received by the mobile station apparatus.
本発明の一実施の形態における基地局装置の一構成例を示す機能ブロック図である。It is a functional block diagram which shows the example of 1 structure of the base station apparatus in one embodiment of this invention. オン期間とＭＢＭＳ送信のサブフレームとが重なった場合に、ＤＲＸ制御における活動期間を延長する場合のタイミングチャート図である。It is a timing chart figure in the case of extending the active period in DRX control, when an ON period and the sub-frame of MBMS transmission overlap. オン時間を前後に拡張した（矢印ＡＲ２、３）例を示す図である。It is a figure which shows the example which extended ON time back and forth (arrow AR2, 3). 図３において、タイマーの状態を合わせて示した図である。In FIG. 3, it is the figure which combined and showed the state of the timer. 図３において、タイマーの状態を合わせて示した別の例のである。FIG. 3 shows another example in which the states of the timer are shown together. 延長期間はＭＢＭＳサブフレームを含まない期間とする第１の例を示す図である。It is a figure which shows the 1st example which makes an extension period the period which does not contain a MBMS sub-frame. 延長期間はＭＢＭＳサブフレームを含まない期間とする第２の例を示す図である。It is a figure which shows the 2nd example which makes an extended period the period which does not contain a MBMS sub-frame. 延長期間はＭＢＭＳサブフレームを含まない期間とする例において、延長量を３サブフレームとした場合の例を示す図である。It is a figure which shows the example at the time of making extension amount into 3 sub-frames in the example which makes an extension period a period which does not contain a MBMS sub-frame. ＤＲＸ制御における活動期間を延長する際、ユニキャストサブフレームが連続する期間が短く、間にＭＢＭＳサブフレームを含む場合は、ＭＢＭＳサブフレームの期間をいったん活動休止状態にした例を示す図である。When extending the active period in DRX control, it is a figure which shows the example which made the period of the MBMS sub-frame into an idle state once, when the period which a unicast sub-frame continues is short and contains an MBMS sub-frame in between. On-duration TimerとMBMS Extend Timer（ＭＢＭＳ延長タイマー）に加え、MBMS ＤＲＸ Timer（ＭＢＭＳ　ＤＲＸタイマー）が用意されている例を示す図である。It is a figure which shows the example in which MBMS * DRX * Timer (MBMS DRX timer) is prepared in addition to On-duration * Timer and MBMS * Extend * Timer (MBMS extension timer). On-duration TimerとMBMS Extend Timer（ＭＢＭＳ延長タイマー）に加え、MBMS Extend Limit Timer（ＭＢＭＳ延長制限タイマー）を用意する例を示す図である。It is a figure which shows the example which prepares MBMS | Extend | Limit | Timer (MBMS extension limit timer) in addition to On-duration | Timer and MBMS | Extend | Timer (MBMS extension timer). ＤＲＸ制御における活動期間を延長する代わりに、ＤＲＸ制御における活動期間をシフトする例を示す図である。It is a figure which shows the example which shifts the active period in DRX control instead of extending the active period in DRX control. 本発明の他の実施の形態による通信技術の一例を示す図であり、ＤＲＸ制御における活動期間を、シフト後も常にその位置において行なうように制御するものである。It is a figure which shows an example of the communication technique by other embodiment of this invention, and controls so that the active period in DRX control may always be performed in the position after a shift. ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒの動作中にＭＢＭＳサブフレームが重なった場合における活動期間を延長する例を示す図である。It is a figure which shows the example which extends the active period when a MBMS sub-frame overlaps during operation | movement of DRX Inactivity Timer. ＥＵＴＲＡにおけるチャネル構成例を示す図である。It is a figure which shows the example of a channel structure in EUTRA. ＥＵＴＲＡにおける下りリンクにおけるフレーム構成の一例を示す図である。It is a figure which shows an example of the frame structure in the downlink in EUTRA. ミックスドセルの配置例を示す図である。It is a figure which shows the example of arrangement | positioning of a mixed cell. ＤＲＸ制御技術の概要を示す図である。It is a figure which shows the outline | summary of DRX control technique. ＭＢＭＳサブフレームの送信周期とＤＲＸサイクルとを同期させ、ＤＲＸ制御における活動期間がＭＢＭＳサブフレームと重ならないようにする関係を示す図である。It is a figure which shows the relationship which synchronizes the transmission period and DRX cycle of a MBMS sub-frame, and the active period in DRX control does not overlap with a MBMS sub-frame.
符号の説明Explanation of symbols
　１００…基地局装置、１０１…データ制御部、１０２…ＯＦＤＭ変調部、１０３…無線部、１０４…スケジューリング部、１０５…上位層。 DESCRIPTION OF SYMBOLS 100 ... Base station apparatus, 101 ... Data control part, 102 ... OFDM modulation part, 103 ... Radio | wireless part, 104 ... Scheduling part, 105 ... Upper layer
　以下に、本発明の実施の形態による通信システムについて図面を参照して説明する。図１は、本発明の一実施の形態における基地局装置の一構成例を示す機能ブロック図である。図１に示すように、基地局装置１００は、データ制御部１０１と、ＯＦＤＭ変調部１０２と、無線部１０３と、スケジューリング部１０４と、上位層１０５と、を含んで構成される。 Hereinafter, a communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram showing a configuration example of a base station apparatus according to an embodiment of the present invention. As illustrated in FIG. 1, the base station apparatus 100 includes a data control unit 101, an OFDM modulation unit 102, a radio unit 103, a scheduling unit 104, and an upper layer 105.
　データ制御部１０１は、スケジューリング部１０４から、制御データ、ユーザデータ、ＭＢＭＳデータの入力を受けるとともに、スケジューリング部１０４から入力されるスケジューリング情報に基づいて、制御データを下りリンク制御チャネル、下りリンク報知チャネル、下りリンク共用チャネルにマッピングする。また、移動局装置に対するユーザデータについては、下りリンク共用チャネル（ＰＤＳＣＨ）にマッピングする。ＭＢＭＳデータについては、下りリンクマルチキャストチャネルにマッピングする。マッピングされた各データは、ＯＦＤＭ変調部１０２へ出力される。 The data control unit 101 receives input of control data, user data, and MBMS data from the scheduling unit 104, and transmits control data to a downlink control channel and a downlink broadcast channel based on scheduling information input from the scheduling unit 104. And mapped to the downlink shared channel. Further, user data for the mobile station apparatus is mapped to a downlink shared channel (PDSCH). The MBMS data is mapped to the downlink multicast channel. Each mapped data is output to OFDM modulation section 102.
　尚、ＭＢＭＳサブフレーム配置パターンやＤＲＸに関する情報は、下りリンク共用チャネルにマッピングされて、移動局装置へ送信される。 In addition, the information regarding the MBMS subframe arrangement pattern and DRX is mapped to the downlink shared channel and transmitted to the mobile station apparatus.
　ＯＦＤＭ変調部１０２は、データ制御部１０１から入力されたデータに対して、データ変調、入力信号の直列／並列変換、ＩＦＦＴ（Ｉｎｖｅｒｓｅ　Ｆａｓｔ　Ｆｏｕｒｉｅｒ　Ｔｒａｎｓｆｏｒｍ、逆高速フーリエ変換）処理、ＣＰ（Ｃｙｃｌｉｃ　Ｐｒｅｆｉｘ）挿入、並びに、フィルタリングなどＯＦＤＭ信号処理を行い、ＯＦＤＭ信号を生成して、無線部１０３へ出力する。 The OFDM modulation unit 102 performs data modulation, serial / parallel conversion of input signals, IFFT (Inverse Fast Fourier Transform) processing, CP (Cyclic Prefix) insertion on the data input from the data control unit 101 In addition, OFDM signal processing such as filtering is performed to generate an OFDM signal and output it to the radio section 103.
　無線部１０３は、ＯＦＤＭ変調部１０２から入力された変調データを無線周波数にアップコンバートして無線信号を生成し、アンテナ（図示せず）を介して、移動局装置に送信する。 Radio section 103 up-converts the modulation data input from OFDM modulation section 102 to a radio frequency to generate a radio signal, and transmits the radio signal to a mobile station apparatus via an antenna (not shown).
　スケジューリング部１０４は、送信信号のスケジューリングを行う。ＭＢＭＳのデータ送信に関するスケジュールは、上位層１０５から指示される。移動局装置向けのユーザデータおよび制御データに関しては、上位層１０５から送信されるユーザデータの量や、無線リソースの空き状況等を考慮し、他の移動局装置向けのユーザデータとの調整を行いスケジューリングする。これらスケジューリング情報は、データ制御部１０１へ出力される。 The scheduling unit 104 performs transmission signal scheduling. A schedule for MBMS data transmission is instructed by the upper layer 105. The user data and control data for the mobile station apparatus are adjusted with the user data for other mobile station apparatuses in consideration of the amount of user data transmitted from the upper layer 105 and the availability of radio resources. Schedule. The scheduling information is output to the data control unit 101.
　移動局装置は、ＤＲＸサイクル（繰返し周期）間隔で、オン期間（on-duration）とＤＲＸ機会(opportunity for DRX)とを繰り返す。オン期間とＤＲＸサイクルとが指定されると、ＤＲＸ機会は一意に定まる。このオン期間は、移動局装置がＰＤＣＣＨをモニタリングするように定められている１サブフレームまたは複数サブフレームで構成される期間である。 The mobile station apparatus repeats an on-duration and a DRX opportunity (opportunity for DRX) at DRX cycle (repetition period) intervals. When the ON period and the DRX cycle are specified, the DRX opportunity is uniquely determined. This ON period is a period composed of one subframe or a plurality of subframes that are determined so that the mobile station apparatus monitors the PDCCH.
　基地局装置は、オン期間において、上りリンクまたは下りリンクのリソース割当てを開始するためＰＤＣＣＨを送信する。オン期間中には、On-duration Timer（オン期間タイマー）を起動し、満了値(expire値)に達するまでＰＤＣＣＨをモニタリングする。オン期間において、上りリンクまたは下りリンクの初期送信データ（新データ）のスケジューリングを示すＰＤＣＣＨを受信した移動局装置は、オン期間を超えてある一定期間ＰＤＣＣＨをモニタリングする。この一定期間の演算にDRX Inactivity Timer（間欠受信非活動タイマー）が使用される。オン期間において上りリンクまたは下りリンクの初期送信データ（新データ）のスケジューリングを示すＰＤＣＣＨを受信した移動局装置は、DRX Inactivity Timerを起動して、基地局装置から指定されたDRX Inactivity Timerの満了値を越えるまでＰＤＣＣＨをモニタリングする。 The base station apparatus transmits the PDCCH to start uplink or downlink resource allocation in the on period. During the on period, an On-duration Timer (on period timer) is activated, and the PDCCH is monitored until an expiration value (expire value) is reached. In the on period, the mobile station apparatus that has received the PDCCH indicating scheduling of uplink or downlink initial transmission data (new data) monitors the PDCCH for a certain period exceeding the on period. DRX Inactivity Timer (intermittent reception inactivity timer) is used for this fixed period of computation. The mobile station apparatus that has received the PDCCH indicating scheduling of uplink or downlink initial transmission data (new data) in the ON period activates DRX Inactivity Timer and the expiration value of DRX Inactivity Timer specified by the base station device PDCCH is monitored until
　また、上りリンクデータまたは下りリンクデータの再送の可能性のある期間においては、移動局装置は、オン期間に関わらず、ＰＤＣＣＨをモニタリングする。この再送の可能性のある期間の演算には、HARQ RTT Timer（ハイブリッド自動再送要求ラウンドトリップタイムタイマー）とDRX Retransmission Timer（間欠受信再送タイマー）が使用される。初期送信データのスケジューリング時にHARQ RTT Timerを起動し、HARQ RTT Timerの満了値に達してからDRX Retransmission Timerを起動し、DRX Retransmission Timerの満了値に達するまでＰＤＣＣＨをモニタリングする。 Also, in a period in which uplink data or downlink data may be retransmitted, the mobile station apparatus monitors the PDCCH regardless of the on period. For calculation of a period during which retransmission is possible, HARQ RTT Timer (hybrid automatic retransmission request round trip time timer) and DRX Retransmission Timer (intermittent reception retransmission timer) are used. When scheduling the initial transmission data, the HARQ 起動 RTT 初期 Timer is started, and after reaching the expiration value of the HARQ RTT Timer, the DRX Retransmission Timer is started, and the PDCCH is monitored until the expiration value of the DRX Retransmission Timer is reached.
　これらＰＤＣＣＨをモニタリングするために、移動局装置が受信部を起動し、起きている状態の期間を活動期間(Active Time)と呼ぶ。この活動期間中、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration Timerが計時している。基地局装置は、移動局装置が活動期間の間にデータを送信する。基地局装置から移動局装置へは、あらかじめ、ＤＲＸサイクルの繰返し周期およびオン期間が通知され、移動局装置はその情報を基にあらかじめ周期的にパワーオンを繰り返すとともにＰＤＣＣＨの受信状況、およびデータの再送状況に応じてパワーオンする。 In order to monitor these PDCCHs, the mobile station apparatus activates the receiving unit, and the period in which the mobile station apparatus is awake is called an active period (Active (Time). During this activity period, DRX InactivityrTimer or DRX Retransmission Timer or On-duration Timer keeps timing. The base station device transmits data while the mobile station device is active. The base station apparatus notifies the mobile station apparatus in advance of the repetition period and ON period of the DRX cycle, and the mobile station apparatus periodically repeats power-on in advance based on the information and the reception status of the PDCCH and data Power on according to the retransmission status.
　活動期間を延長する方法は、ＭＢＭＳサブフレームとオン期間とがぶつかった場合に、オン期間または活動期間を延長する方法と、ＭＢＭＳサブフレームと活動期間がぶつかった場合に、活動期間を延長する方法とがある。 The method of extending the activity period includes a method of extending the on period or the activity period when the MBMS subframe and the on period collide, and a method of extending the activity period when the MBMS subframe and the activity period collide. There is.
　すなわち、ＭＢＭＳサブフレームにおいて、On-duration Timer、DRX Inactivity Timer、DRX Retransmission Timerをカウントアップするかによって制御する。 That is, in the MBMS subframe, control is performed depending on whether the On-duration Timer, DRX Inactivity Timer, and DRX Retransmission Timer are counted up.
　また、延長期間とＭＢＭＳサブフレームとの関係については、ＭＢＭＳサブフレームをＤＲＸ機会として扱う方法と、ＭＢＭＳサブフレームも継続してモニタリングする方法と、がある。 Also, regarding the relationship between the extension period and the MBMS subframe, there are a method of handling the MBMS subframe as a DRX opportunity and a method of continuously monitoring the MBMS subframe.
　図２はオン期間とＭＢＭＳ送信のサブフレームとが重なった場合に、ＤＲＸ制御における活動期間を延長する場合のタイミングチャート図である。 FIG. 2 is a timing chart when the active period in the DRX control is extended when the ON period and the MBMS transmission subframe overlap.
　尚、移動局装置へは、あらかじめ、基地局装置よりＤＲＸサイクルとオン期間の長さとが通知されている。また、ＭＢＭＳサービスが提供されるかもしれないとして設定されているサブフレーム（ＭＢＭＳサブフレーム）の配置を示すＭＢＭＳサブフレーム配置パターン（ＭＳＡＰ）も通知されている。加えて、本実施の形態においては、ＭＢＭＳサービスとＤＲＸ制御におけるオン期間とが重なった場合の延長量を通知する。ここでは移動局装置のＤＲＸサイクルが２０サブフレーム（２０ｍｓ）、オン期間が２サブフレーム（２ｍｓ）、重なった場合の延長量（矢印ＡＲ１で示す）が３サブフレーム（３ｍｓ）である。また、基地局装置は、これに合わせて１ラジオフレーム置きに、サブフレーム１にてデータを送信するものとする。なお、通常データの送信は１サブフレームで行なわれるが、移動局装置の間欠受信時の復帰精度等を考慮してオン期間はこれより多い期間とするのが普通である。 Note that the mobile station apparatus is notified in advance of the DRX cycle and the length of the on period from the base station apparatus. Also, an MBMS subframe arrangement pattern (MSAP) indicating the arrangement of subframes (MBMS subframes) set as the MBMS service may be provided is also notified. In addition, in the present embodiment, the extension amount when the MBMS service and the ON period in the DRX control overlap is notified. Here, the DRX cycle of the mobile station apparatus is 20 subframes (20 ms), the ON period is 2 subframes (2 ms), and the extension amount (indicated by arrow AR1) when overlapping is 3 subframes (3 ms). In addition, the base station apparatus transmits data in subframe 1 every other radio frame accordingly. Although normal data is transmitted in one subframe, the ON period is usually set longer than this in consideration of the return accuracy during intermittent reception of the mobile station apparatus.
　このとき、図２の３番目のラジオフレームＦ３がＭＢＭＳサービスに供され、その中で１，２，３，６，８サブフレームが、実際にＭＢＭＳサービスに使用されるものとすると、このときサブフレーム１で送信すべき移動局装置向けのデータ（Ｄ１）はＭＢＭＳサービスが供されているため送信できないため、次のＭＢＭＳサービスに供していないサブフレームであるサブフレーム４においてデータの送信を行なう（Ｄ２）。 At this time, if the third radio frame F3 in FIG. 2 is used for the MBMS service, and the 1, 2, 3, 6, and 8 subframes are actually used for the MBMS service, the subframe at this time Since the data (D1) for the mobile station apparatus to be transmitted in the frame 1 cannot be transmitted because the MBMS service is provided, the data is transmitted in the subframe 4 which is a subframe not provided for the next MBMS service ( D2).
　移動局装置側では基地局装置より通知されたＤＲＸサイクルとオン期間情報に基づき、ＤＲＸを行ない、データの受信を行なうが、ＭＢＭＳサブフレーム配置パターンが通知されている。従って、どのサブフレームでＤＲＸとＭＢＭＳサービスとが重なるかを知っている。このタイミングにおいては、移動局装置では、基地局装置より通知されたＤＲＸ制御におけるオン時間の延長量またはオン期間とＭＢＭＳサブフレームが重なったサブフレーム数に基づき、オン時間を延長して（符号ＡＲ１）ＤＲＸを行なう。これにより基地局装置が本来の時間とはずらして送信したデータであっても受信することができる。 The mobile station apparatus performs DRX and receives data based on the DRX cycle and on-period information notified from the base station apparatus, but the MBMS subframe arrangement pattern is notified. Therefore, it knows in which subframe the DRX and the MBMS service overlap. At this timing, the mobile station apparatus extends the on time based on the extension amount of the on time in the DRX control notified from the base station apparatus or the number of subframes in which the MBMS subframe overlaps with the on time (reference AR1). ) Perform DRX. Thereby, even the data transmitted by the base station apparatus out of the original time can be received.
　尚、本実施の形態においては、データの送信を後ろにずらしてＤＲＸ制御におけるオン期間を後ろに延長したが、送信を前のＭＢＭＳサービスが行なわれないサブフレームに移動して、ＤＲＸ制御におけるオン期間を前に延長しても良い。また、ＤＲＸ制御におけるオン期間を前後に拡張しても良い。特に前後に拡張する場合には、拡張した期間のいずれかのサブフレームにて基地局装置がデータを送信すればよいので、スケジューリングの自由度が増す効果がある。オン時間を前後に拡張した（矢印ＡＲ２、３）例を図３に示す。図３に示すように、データ送信をＤ１からＤ４に前側に移動させて行うこともできる。　
　尚、ＤＲＸ制御における活動期間の延長量は、延長される期間にＭＢＭＳサブフレームを含んだ期間として計算してもよいし、ＭＢＭＳサブフレームを含まない期間として計算してもよい。 In this embodiment, the data transmission is shifted backward to extend the ON period in the DRX control. However, the transmission is moved to a subframe in which the previous MBMS service is not performed, and the DRX control is turned on. The period may be extended before. Further, the ON period in DRX control may be extended back and forth. In particular, when extending back and forth, since the base station apparatus only needs to transmit data in any subframe in the extended period, there is an effect of increasing the degree of freedom of scheduling. An example in which the on-time is extended back and forth (arrows AR2, 3) is shown in FIG. As shown in FIG. 3, data transmission can be performed by moving the data from D1 to D4 to the front side.
Note that the extension amount of the activity period in the DRX control may be calculated as a period including the MBMS subframe in the extended period, or may be calculated as a period not including the MBMS subframe.
　前者の場合（延長される期間はＭＢＭＳサブフレームを含んだ期間）は、ＯＮ期間タイマー（On-duration Timer）は、ＭＢＭＳサブフレームでもカウントアップし、オン期間がＭＢＭＳサブフレームの場合には、満了値が増加（例えば、オン期間とＭＢＭＳサブフレームとが重なったサブフレーム数を設定されている満了値に加算、または、予め定められた（仕様で設定または基地局装置から設定される）値を満了値に加算）される。これにより、オン期間がＭＢＭＳサブフレームの場合にオン時間が延長されることになる。オン期間の延長（ＡＲ４）は、活動期間の延長でもある。但し、ここでの活動期間とは、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration Timerが計時している期間のことを指す。図４は、これらタイマーの状態を合わせて示した図である。タイマーのオン期間タイマーも、同様に満了値加算分だけ計時される期間が延長される。ここで、計時とは、サブフレーム単位でサブフレーム数をカウントすることを意味する。 In the former case (the extended period includes the MBMS subframe), the ON period timer (On-duration Timer) counts up even in the MBMS subframe, and expires when the on period is the MBMS subframe. The value increases (for example, the number of subframes in which the ON period and the MBMS subframe overlap each other is added to the set expiration value, or a predetermined value (set in the specification or set from the base station apparatus) is added. Added to the expiration value). As a result, the on-time is extended when the on-period is an MBMS subframe. The extension of the on period (AR4) is also an extension of the activity period. However, the activity period here refers to a period during which the DRX Inactivity Timer, the DRX Retransmission Timer, or the On-duration Timer is counting. FIG. 4 is a diagram showing the states of these timers together. Similarly, the on-time timer of the timer is extended for the time period counted by the addition of the expiration value. Here, the time measurement means counting the number of subframes in units of subframes.
　もう一つの方法としては、On-duration Timerとは別に、MBMS Extend Timer（ＭＢＭＳ延長タイマー）が用意され、オン期間とＭＢＭＳサブフレームとが重なったサブフレーム数または予め定められた（仕様で設定または基地局装置から設定される）値がMBMS Extend Timerの満了値として設定される。On-duration Timerが計時中にＭＢＭＳサブフレームに遭遇し、さらに、On-duration Timerが満了した直後にMBMS Extend Timerが起動され、移動局装置は、MBMS Extend Timerが計時している間もＰＤＣＣＨをモニタリングする。 Another method is to prepare MBMS Extend 延長 Timer (MBMS extension timer) separately from On-duration Timer and set the number of sub-frames in which the ON period and MBMS sub-frames overlap or a predetermined number (set or set in the specification). The value set from the base station apparatus is set as the expiration value of MBMSMBExtend Timer. When the On-duration Timer encounters an MBMS subframe, the MBMS Extend Timer is started immediately after the On-duration Timer expires, and the mobile station device continues to use the PDCCH while the MBMS Extend Timer is timing. Monitor.
　尚、On-duration TimerおよびMBMS Extend Timerは、ＭＢＭＳサブフレームでもカウントアップする。これにより、オン期間がＭＢＭＳサブフレームの場合に、活動時間が延長されることになる。但し、ここでの活動期間とは、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration TimerまたはMBMS Extend Timerが計時している期間のことを指す。図５にこれらタイマーの状態を合わせて図示する。図４、図５に示す場合には、移動局装置は延長量として定められた期間のみＤＲＸ制御における活動期間を延長すればよく、処理が簡単になるという利点がある。 The On-duration Timer and MBMS Extend Timer also count up in MBMS subframes. As a result, when the ON period is an MBMS subframe, the active time is extended. Here, the activity period refers to a period in which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is timing. FIG. 5 shows the states of these timers together. In the case shown in FIGS. 4 and 5, the mobile station apparatus only has to extend the activity period in the DRX control only during the period determined as the extension amount, and there is an advantage that the processing becomes simple.
　後者の場合（延長される期間はＭＢＭＳサブフレームを含まない期間）、On-duration Timerは、ＭＢＭＳサブフレームではカウントアップされない。これにより満了値に達するサブフレームが延期され（ＡＲ６）、オン時間が延長されることになる。送信タイミングもＤ１からＤ５に変更される。ＡＲ６に示すように、オン期間の延長は活動期間の延長でもある。但し、ここでの活動期間とは、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration Timerが計時している期間のことを指す。図６Ａにこれらタイマーの状態を合わせて図示する。 In the latter case (the extended period does not include the MBMS subframe), the On-duration Timer is not counted up in the MBMS subframe. As a result, the subframe reaching the expiration value is postponed (AR6), and the on-time is extended. The transmission timing is also changed from D1 to D5. As shown in AR6, the extension of the on period is also the extension of the activity period. However, the activity period here refers to a period during which the DRX Inactivity Timer, the DRX Retransmission Timer, or the On-duration Timer is counting. FIG. 6A shows the states of these timers together.
　もう一つの方法としては、図６Ｂに示すように、On-duration Timerとは別にMBMS Extend Timer（ＭＢＭＳ延長タイマー）が用意され、オン期間とＭＢＭＳサブフレームが重なったサブフレーム数または予め定められた（仕様で設定または基地局装置から設定される）値がMBMS Extend Timerの満了値として設定される。On-duration Timerが走行中にＭＢＭＳサブフレームに遭遇し、さらに、On-duration Timerが満了した直後にMBMS Extend Timerが起動され、移動局装置は、MBMS Extend Timerが走っている間もＰＤＣＣＨをモニタリングする。尚、On-duration Timerは、ＭＢＭＳサブフレームでもカウントアップされるが、MBMS Extend（延長） Timerは、ＭＢＭＳサブフレームではカウントアップされない（点線で示される）。これにより、オン期間がＭＢＭＳサブフレームと重なる場合に、活動時間が延長されることになる（ＡＲ７）。但し、ここでの活動期間とは、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration TimerまたはMBMS Extend Timerが計時している期間のことを指す。これらの場合、延長期間として示された期間に含まれるＭＢＭＳサブフレームの数によって実際の延長期間が異なってしまうが、ＭＢＭＳサブフレームがいつどのタイミングで存在するかはあらかじめ移動局装置が知っているので不都合はない。また、実際に基地局装置が、ＭＢＭＳサブフレームに重なった期間に送るべきデータを送信するのは、次のＭＢＭＳサブフレームでないサブフレーム以降においてであるため、ＭＢＭＳサブフレームの連続数に関わらず重なった期間のデータを受信側は受信できる利点がある。 As another method, as shown in FIG. 6B, an MBMS Extend Timer (MBMS extension timer) is prepared separately from the On-duration Timer, and the number of sub-frames where the ON period and the MBMS sub-frame overlap each other or predetermined The value (set by specification or set from the base station device) is set as the expiration value of MBMS Extend Timer. An MBMS subframe is encountered while the On-duration Timer is running, and the MBMS Extend Timer is started immediately after the On-duration Timer expires, and the mobile station device monitors the PDCCH while the MBMS Extend Timer is running. To do. Note that On-durationrTimer is also counted up in the MBMS subframe, but MBMS Extend Extension Timer is not counted up in the MBMS subframe (indicated by a dotted line). Accordingly, when the ON period overlaps with the MBMS subframe, the active time is extended (AR7). Here, the activity period refers to a period in which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is timing. In these cases, the actual extension period varies depending on the number of MBMS subframes included in the period indicated as the extension period, but the mobile station apparatus knows in advance when and when the MBMS subframe exists. So there is no inconvenience. In addition, since the base station apparatus actually transmits data to be sent in a period overlapping with the MBMS subframe after the subframe that is not the next MBMS subframe, the base station apparatus overlaps regardless of the number of consecutive MBMS subframes. There is an advantage that the receiving side can receive data of a certain period.
　図７に、あらためてこれらの例を示す。MBMS Extend Timerの延長量を３サブフレームとした場合について、それぞれの場合を説明している。ＤＲＸの状態を表す上側の図は、延長される期間（ＡＲ８）をＭＢＭＳサブフレームを含んだ期間（この場合は３サブフレーム）とする例である。この場合は、Ｄ１で送信すべきデータは、ＭＢＭＳサブフレーム１から３までを除いた次のサブフレームである４で送信される（Ｄ７）。このように、重なる場合にはＭＢＭＳサブフレームの配置に関わらず、常に３サブフレーム分活動期間を延長する。 Figure 7 shows these examples again. Each case where the extension amount of MBMS MBExtend Timer is 3 subframes is described. The upper diagram showing the state of DRX is an example in which the extended period (AR8) is a period including MBMS subframes (in this case, three subframes). In this case, data to be transmitted in D1 is transmitted in 4 which is the next subframe excluding MBMS subframes 1 to 3 (D7). Thus, in the case of overlapping, the activity period is always extended by 3 subframes regardless of the arrangement of MBMS subframes.
　一方、下側の図は、延長される期間をＭＢＭＳサブフレームを含まない期間とする例を示す図である。延長された活動期間にＭＢＭＳサブフレームを含まない期間が常に３サブフレーム含まれるよう、ＤＲＸ制御における活動期間の延長を行なっている（ＡＲ９）。Ｄ８で示される位置がデータの送信位置である。 On the other hand, the lower diagram is a diagram illustrating an example in which the extended period is a period not including the MBMS subframe. The active period in the DRX control is extended so that a period not including the MBMS subframe is always included in the extended active period (AR9). The position indicated by D8 is the data transmission position.
　さらに、ＤＲＸ制御における活動期間を延長する際、ユニキャストサブフレームが連続する期間が短く、間にＭＢＭＳサブフレームを含む場合は、ＭＢＭＳサブフレームの期間をいったん活動休止状態にしても良い。図８はこのような例を示す図である。オン期間とＭＢＭＳ送信のサブフレームとが重なった場合に、ＭＢＭＳ送信サブフレームを含まないで３サブフレーム分ＤＲＸ期間を延長し（ＡＲ１０）、送信側はこの間で重なったデータの送信を行なうものとする。図８で、本来サブフレーム１でデータを送信するのであるが（Ｄ１）、そこはＭＢＭＳサブフレームと重なるので、以降のＭＢＭＳサブフレームでないサブフレーム３つ以内、すなわち、図８では３、５、９サブフレームで送信を行なうものとする。このとき、図８に示す例では、図７の場合と異なり、６、７、８のサブフレームはＭＢＭＳサブフレームであるため、９サブフレームまで活動期間を延長するのであるが、ＭＢＭＳサブフレームが連続しているため、ＤＲＸ制御における活動期間が長くなり消費電力が大きくなる。そこで、ある期間以上ＭＢＭＳサブフレームが連続する場合には（ここでは、６～８までのＭＢＭＳサブフレーム）、その間、ＤＲＸ制御における活動期間の延長を休止することにより電力消費を抑えることができる。このあと、９サブフレームで移動局装置は再びＤＲＸ制御における活動期間となる。 Furthermore, when extending the active period in DRX control, if the period in which unicast subframes continue is short and includes an MBMS subframe, the MBMS subframe period may be temporarily suspended. FIG. 8 is a diagram showing such an example. When the ON period overlaps with the MBMS transmission subframe, the DRX period is extended by 3 subframes without including the MBMS transmission subframe (AR10), and the transmitting side transmits the overlapped data between them. To do. In FIG. 8, data is originally transmitted in subframe 1 (D1), which overlaps with the MBMS subframe, and therefore within 3 subframes that are not subsequent MBMS subframes, that is, 3, 5, It is assumed that transmission is performed in 9 subframes. At this time, in the example shown in FIG. 8, unlike the case of FIG. 7, since the subframes 6, 7, and 8 are MBMS subframes, the activity period is extended to 9 subframes. Since it is continuous, the active period in DRX control becomes long and the power consumption increases. Therefore, when MBMS subframes continue for a certain period or longer (here, MBMS subframes from 6 to 8), power consumption can be suppressed by stopping the extension of the active period in DRX control during that period. Thereafter, in 9 subframes, the mobile station apparatus again becomes an active period in the DRX control.
　図９に示すように、On-duration Timer（オン期間タイマー）とMBMS Extend Timer（ＭＢＭＳ延長タイマー）に加え、MBMS ＤＲＸ Timer（ＭＢＭＳ　ＤＲＸタイマー）が用意されている。ＭＢＭＳ　ＤＲＸタイマーは活動期間中のＭＢＭＳサブフレームが重なる期間に一時的に活動期間を休止するために計時を行なうものである。On-duration Timerが満了した直後にMBMS Extend Timerが起動される。移動局装置は、また、受信したＭＳＡＰ情報からＭＢＭＳサブフレームの連続数およびその位置を調べ、その連続数が予め定められた（仕様で設定されるか、または、基地局装置から設定される、もしくは、移動局装置が設定する）値以上であれば、連続数を満了値として、そのＭＢＭＳサブフレームの連続位置よりＭＢＭＳ　ＤＲＸ　Ｔｉｍｅｒをスタートする。移動局装置は、MBMS Extend Timerが計時している間もＰＤＣＣＨをモニタリングするが、ＭＢＭＳ　ＤＲＸ　Ｔｉｍｅｒ動作時には、MBMS Extend Timer動作時であっても活動期間を一旦休止する（非カウントアップ部、すなわち点線部分参照）。その後、ＭＢＭＳ　ＤＲＸ　Ｔｉｍｅｒが満了すると、移動局装置は活動期間に復帰する（“９”のサブフレーム）。尚、On-duration TimerおよびＭＢＭＳ　ＤＲＸ　Ｔｉｍｅｒは、ＭＢＭＳサブフレームでもカウントアップされるが、MBMS Extend Timerは、ＭＢＭＳサブフレームではカウントアップされない。但し、ここでの活動期間とは、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration TimerまたはMBMS Extend Timerが走っている期間で、かつ、ＭＢＭＳ　ＤＲＸ　Ｔｉｍｅｒが走っていない期間のことを指す。 As shown in FIG. 9, in addition to On-duration Timer (on-period timer) and MBMS Extension Timer (MBMS extension timer), MBMS DRX Timer (MBMS DRX timer) is prepared. The MBMS DRX timer measures time to temporarily suspend the active period during the period when MBMS subframes during the active period overlap. The MBMS Extend Timer is started immediately after the On-duration Timer expires. The mobile station apparatus also checks the number of consecutive MBMS subframes and the position thereof from the received MSAP information, and the number of consecutive frames is determined in advance (set in the specification or set from the base station apparatus. Alternatively, if the value is equal to or greater than the value set by the mobile station apparatus, the MBMS DRX Timer is started from the continuous position of the MBMS subframe with the continuous number as the expiration value. The mobile station device monitors the PDCCH while the MBMS Extend Timer is counting, but when the MBMS DRX Timer is operating, it temporarily suspends the activity period even when the MBMS Extend Timer is operating (non-count-up unit, that is, dotted line) Part reference). Thereafter, when the MBMS DRX Timer expires, the mobile station apparatus returns to the active period (“9” subframe). On-duration Timer and MBMS DRX Timer are also counted up in the MBMS subframe, but MBMS Extend Timer is not counted up in the MBMS subframe. However, the activity period here refers to the period during which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is running and the MBMS DRX Timer is not running.
　図１０は、他の方法の一例を示す図である。図１０に示す方法では、On-duration TimerとMBMS Extend Timer（ＭＢＭＳ延長タイマー）に加え、MBMS Extend Limit Timer（ＭＢＭＳ延長制限タイマー）を用意する。On-duration Timerが満了した直後にMBMS Extend TimerおよびMBMS Extend Limit Timerが起動する。移動局装置は、MBMS Extend Timerが計時している間もＰＤＣＣＨをモニタリングする。MBMS Extend Timerは、MBMS Extend Limit Timerが満了する（ＡＲ１４の矢印の終点）と停止される（延長打ち切り）。ＤＲＸも、ＡＲ１３で示すように、同じ時点まで延長される。Ｄ１で送信されるはずだった送信データは、Ｄ１０に示すように４サブフレームにおいて送信される。 FIG. 10 is a diagram illustrating an example of another method. In the method shown in FIG. 10, in addition to an On-duration Timer and an MBMS Extension Timer (MBMS extension timer), an MBMS Extension Limit Timer (MBMS extension limit timer) is prepared. Immediately after the On-duration Timer expires, the MBMS Extend Timer and MBMS Extend Limit Timer are started. The mobile station apparatus monitors the PDCCH while the MBMS Extend Timer is timing. The MBMS Extend Timer is stopped (extension abort) when the MBMS Extend Limit Timer expires (the end point of the arrow of AR14). DRX is also extended to the same time as indicated by AR13. The transmission data that was supposed to be transmitted in D1 is transmitted in 4 subframes as shown in D10.
　MBMS Extend Limit Timerは、MBMS Extend Timerが満了（延長打ち切り）すると停止される。すなわち、MBMS Extend Limit Timerの満了値は、活動期間が長くなりすぎないように制限する制限値として設定されているものである。尚、On-duration TimerおよびMBMS Extend Limit Timerは、ＭＢＭＳサブフレームでもカウントアップされるが、MBMS Extend Timerは、破線でも示されるように、ＭＢＭＳサブフレームではカウントアップされない。但し、ここでの活動期間とは、DRX Inactivity TimerまたはDRX Retransmission TimerまたはOn-duration TimerまたはMBMS Extend Timerが計時している期間のことを指す。なお図８に示す例においては、９サブフレームのみ再度ＤＲＸ制御における活動期間に入っているが、移動局装置の間欠受信時の精度を考慮してさらに余分なサブフレーム分活動期間をとるようにしてもよい。 The MBMS Extend Limit Timer is stopped when the MBMS Extend Timer expires (extension abort). That is, the expiration value of MBMS Extend Limit Timer is set as a limit value that limits the activity period so that it does not become too long. The On-duration Timer and MBMS Extend Limit Timer are counted up in the MBMS subframe, but the MBMS Extend Timer is not counted up in the MBMS subframe as shown by the broken line. Here, the activity period refers to a period in which the DRX Inactivity Timer, DRX Retransmission Timer, On-duration Timer, or MBMS Extend Timer is timing. In the example shown in FIG. 8, only 9 subframes are in the active period in DRX control again. However, in consideration of the accuracy at the time of intermittent reception by the mobile station apparatus, an extra subframe active period is taken. May be.
　図１１は、本発明の他の実施の形態による通信技術の一例を表す図である。図１１に示す例では、ＤＲＸ制御における活動期間を延長する代わりに、ＤＲＸ制御における活動期間をシフトするものである。上のＤＲＸの状態はシフトを行なわない場合の例であり、下のＤＲＸの状態はシフトを行なう場合の例を表している。すなわち、ＤＲＸサイクルの先頭でＭＢＭＳサブフレームと重なった場合に、On-duration Timerを起動せず、次のＭＢＭＳ用ではないサブフレーム（ユニキャスト用サブフレーム）まで待ち（ＡＲ１５）、On-duration Timerを起動する。Ｄ１で送信するはずだったデータは、移動したＤＲＸ期間の先頭のサブフレーム（Ｄ１１）において送信することができる。本実施の形態においては、ＭＢＭＳサブフレームとＤＲＸ制御における活動期間が重なった場合であっても、ＤＲＸの期間を延長しない制御を行うため、移動局装置の消費電力の増加を抑えることが出来るという利点がある。 FIG. 11 is a diagram illustrating an example of a communication technique according to another embodiment of the present invention. In the example shown in FIG. 11, instead of extending the activity period in DRX control, the activity period in DRX control is shifted. The upper DRX state is an example when the shift is not performed, and the lower DRX state is an example when the shift is performed. That is, when it overlaps with the MBMS subframe at the beginning of the DRX cycle, the On-duration Timer is not started, but waits for the next subframe not for MBMS (unicast subframe) (AR15), and the On-duration Timer Start up. The data that should have been transmitted in D1 can be transmitted in the first subframe (D11) of the moved DRX period. In the present embodiment, even when the active period in the MBMS subframe and DRX control overlap, control is performed without extending the DRX period, so that an increase in power consumption of the mobile station apparatus can be suppressed. There are advantages.
　尚、ＤＲＸ制御における活動期間のシフト量は延長する場合と同様に、ＭＢＭＳサブフレームを含んだ期間として考慮しも良いし、ＭＢＭＳサブフレームを含まない期間として考慮してもよい。さらに、ＭＢＭＳサブフレームが連続する期間が短く、間にＭＢＭＳサブフレームを含む場合は、ＭＢＭＳサブフレームの期間を一旦活動休止状態にしても良い。 Note that the shift amount of the active period in the DRX control may be considered as a period including the MBMS subframe, or may be considered as a period not including the MBMS subframe, as in the case of extending. Furthermore, when the period in which MBMS subframes are continuous is short and includes an MBMS subframe, the MBMS subframe period may be temporarily inactive.
　図１２は、本発明の他の実施の形態による通信技術の一例を示す図であり、ＤＲＸ制御における活動期間を、シフト後も常にその位置において行なうように制御するものである。上記の実施の形態においては、ＭＢＭＳサブフレームに重なる場合にのみＤＲＸの時間をシフトするように制御していた。これに対して、本実施の形態では、重なった以降のサブフレームにおいてもシフトした時間で送信を行い、ＤＲＸ制御における活動時間もシフトした時間で行なうようにしたものである。 FIG. 12 is a diagram showing an example of a communication technique according to another embodiment of the present invention, and controls the active period in the DRX control so that it is always performed at the position after the shift. In the above-described embodiment, control is performed so that the DRX time is shifted only when it overlaps the MBMS subframe. On the other hand, in the present embodiment, transmission is performed in the shifted time even in the subframes after overlapping, and the active time in the DRX control is also performed in the shifted time.
　例えば、ＭＢＭＳサブフレームの配置パターンはＭＢＭＳサービスの変更等により変更される場合がある。図１２では４ラジオフレーム（４０ｍｓ）毎にＭＢＭＳサービスを行なっており、途中でＭＢＭＳサブフレーム中のＭＢＭＳ配置パターンが変わる例を示している。ＤＲＸ制御における活動期間が当初、ＭＢＭＳサブフレームの配置パターンの周期と同期して、２ラジオフレーム（２０ｍｓ）毎にサブフレーム０、１に設定されているものとする。ＤＲＸ制御における活動期間が、ＭＢＭＳサブフレームのないサブフレームに合わせてあるが、ｔ１１において始まる１ラジオフレームでは、ＭＢＭＳサブフレームの配置パターンが再設定されたため、ＤＲＸの期間と重なる状況になっている。この場合に、上記の実施の形態においては、ＤＲＸ制御における活動期間をシフトしていたが、これはこの後も４ラジオフレーム（４０ｍｓ）毎に繰り返される。本実施形態においては、この場合、ＭＢＭＳサブフレームに重ならないようにシフトを行ない、以降もそのタイミング（図１２においてはサブフレーム４、５）をＤＲＸ制御における活動期間とすることにより、以降もＭＢＭＳサブフレームに重なることを回避することができる。尚、ＭＢＭＳサブフレームを再配置するタイミングや、再配置後のための情報は、通常、あらかじめ移動局装置に伝えられるので、移動局装置はＤＲＸ制御における活動期間のシフトの開始時期を、ＭＢＭＳサブフレームの再配置のタイミングに合わせて行なうことができる。 For example, the MBMS subframe arrangement pattern may be changed by changing the MBMS service. FIG. 12 shows an example in which the MBMS service is performed every 4 radio frames (40 ms), and the MBMS arrangement pattern in the MBMS subframe changes in the middle. Assume that the active period in DRX control is initially set to subframes 0 and 1 every two radio frames (20 ms) in synchronization with the cycle of the MBMS subframe arrangement pattern. The active period in the DRX control is matched with a subframe without an MBMS subframe. However, in one radio frame starting at t11, the arrangement pattern of the MBMS subframe is reset, so that it overlaps with the DRX period. . In this case, in the above embodiment, the activity period in the DRX control is shifted, but this is repeated every 4 radio frames (40 ms) thereafter. In this embodiment, in this case, shifting is performed so as not to overlap with the MBMS subframe, and thereafter, the timing ( subframes 4 and 5 in FIG. 12) is set as the active period in the DRX control. It is possible to avoid overlapping the subframe. In addition, since the timing for rearranging the MBMS subframe and information for the rearrangement are normally transmitted to the mobile station apparatus in advance, the mobile station apparatus determines the start timing of the shift of the active period in the DRX control. This can be performed in accordance with the timing of frame rearrangement.
　以上においては、オン期間とＭＢＭＳ送信のサブフレームとが重なった場合に、ＤＲＸ制御における活動期間を延長する場合について説明したが、以下の実施の形態では、活動期間とＭＢＭＳ送信のサブフレームとが重なった場合に、ＤＲＸ制御における活動期間を延長する場合について説明する。 In the above description, the case where the active period in the DRX control is extended when the ON period overlaps with the MBMS transmission subframe has been described. However, in the following embodiment, the active period and the MBMS transmission subframe include A case where the activity period in the DRX control is extended in the case of overlapping will be described.
　移動局装置側では、基地局装置より通知されたＤＲＸサイクルとオン期間情報とに基づきＤＲＸを行ない、データの受信を行なう。移動局装置側では、ＭＢＭＳサブフレーム配置パターンが通知されているので、どのサブフレームでＤＲＸとＭＢＭＳサービスとが重なるか知っている。このタイミングにおいては、活動期間を延長してＤＲＸを行なう。これにより基地局装置が本来の時間とはずらして送信したデータであっても受信を行なうことができる。すなわち、On-duration TimerおよびDRX Inactivity TimerおよびDRX　 Retransmission Timerは、ＭＢＭＳサブフレームではカウントアップされない。これにより満了値に達するサブフレームが延期され、活動時間が延長されることになる。図１３は、ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒの動作中にＭＢＭＳサブフレームが重なった場合における活動期間を延長する例を示す図である。移動局装置では、ＰＤＣＣＨの受信後、DRX Inactivity Timerを起動して、基地局装置から指定されたDRX Inactivity Timerの満了値を越えるまでＰＤＣＣＨをモニタリングする。ここでは、ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒの満了値として３サブフレームが指定されている場合を例として説明する。この間にＭＢＭＳ送信サブフレームが重なった場合に（Ｄ１）、ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒのカウントアップを行なわないことで（破線で示される非カウントアップ期間の開始：ＡＲ１９）、ＰＤＣＣＨ受信後のモニタリング期間を延長する（ＡＲ１７）。基地局装置はこの延長された期間中にデータ送信を行なう。 On the mobile station device side, DRX is performed based on the DRX cycle and on-period information notified from the base station device, and data is received. Since the mobile station apparatus side is notified of the MBMS subframe arrangement pattern, it knows in which subframe the DRX and the MBMS service overlap. At this timing, the activity period is extended and DRX is performed. As a result, it is possible to receive even data transmitted by the base station apparatus out of the original time. That is, On-duration Timer, DRX Inactivity Timer, and DRX Retransmission Timer are not counted up in the MBMS subframe. This postpones the subframe that reaches the expiration value and prolongs the activity time. FIG. 13 is a diagram illustrating an example of extending the activity period when MBMS subframes overlap during the operation of DRX Inactivity Timer. After receiving the PDCCH, the mobile station device starts DRX Inactivity Timer and monitors the PDCCH until the expiration value of DRX Inactivity Timer designated by the base station device is exceeded. Here, a case where 3 subframes are designated as the expiration value of DRX Inactivity Timer will be described as an example. If MBMS transmission subframes overlap during this period (D1), the DRX Inactivity Timer is not counted up (start of the non-counting period indicated by the broken line: AR19), thereby extending the monitoring period after receiving the PDCCH. (AR17). The base station apparatus performs data transmission during this extended period.
　ＰＤＣＣＨはオン期間、もしくは活動期間（すなわち、Ｏｎ－ｄｕｒａｔｉｏｎ　ｔｉｍｅｒ、ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒ、ＤＲＸ　Ｒｅｔｒａｎｓｍｉｓｓｉｏｎ　Ｔｉｍｅｒ計時時）に受け取る必要がある。オン期間タイマーは、オン期間であることを定義するもので、図１３に示す実施の形態では、その期間はＭＢＭＳサブフレームの有無や、ＰＤＣＣＨの有無に関わらず固定の値であり、必ず決まった時間に開始、終了となる。活動期間の延長に関わってくるのは、ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒ、ＤＲＸ　Ｒｅｔｒａｎｓｍｉｓｓｉｏｎ　Ｔｉｍｅｒである。ＰＤＣＣＨをその間に受信すると、ＤＲＸ　Ｉｎａｃｔｉｖｉｔｙ　Ｔｉｍｅｒが再度、初めからカウントアップを開始するようリセットされ、その結果、モニタリング期間(活動期間)が延長される。 The PDCCH needs to be received during the on-period or activity period (that is, on-duration timer, DRX Inactivity Timer, DRX Retransmission Timer timing). The on-period timer defines an on-period. In the embodiment shown in FIG. 13, the period is a fixed value regardless of the presence / absence of an MBMS subframe and the presence / absence of a PDCCH. Start and end at time. DRX Inactivity Timer and DRX Retransmission Timer are involved in extending the activity period. If the PDCCH is received in the meantime, the DRX Inactivity Timer is reset again to start counting up from the beginning, and as a result, the monitoring period (activity period) is extended.
　このように、活動期間中にＭＢＭＳサブフレームでカウントアップを行わないことにより、ＭＢＭＳ送信のサブフレームと重なった場合においても活動期間を延長することができる。尚、オン期間とＭＢＭＳ送信のサブフレームとが重なった場合に、ＤＲＸ制御における活動期間を延長する場合について説明したのと同様な手法で、例えばMBMS Extend Timerを導入するなどして、活動期間を延長しても良い。 Thus, by not counting up in the MBMS subframe during the activity period, the activity period can be extended even when it overlaps with the MBMS transmission subframe. In addition, when the ON period overlaps with the MBMS transmission subframe, the activity period is set by, for example, introducing MBMS Extend Timer in the same manner as described for extending the activity period in DRX control. It may be extended.
　これら、オン期間、活動期間の延長量、ＭＢＭＳ　Ｅｘｔｅｎｄ　Ｔｉｍｅｒ等の満了値、満了値の増加値、ＭＢＭＳ送信のサブフレームと重なった場合の各タイマーのカウントアップの有無等は、前述したように、予め定められた値としていても良いし、基地局装置から移動局装置へ通知するようにしても良いが、ＭＢＭＳサービス期間の配置パターンに従って定めるようにしても良い。例えば、ＭＢＭＳサービス期間の配置密度が大きい場合には、オン期間や活動期間の満了値の増加値を大きくすることにより、延長した活動期間中にユニキャストのサブフレームが多く含まれるようにしてデータの送信、受信機会を増やすことが出来る。このとき、これらの値の導出方法を送信装置、受信装置とで共通に定めておくことで、ＭＢＭＳサービス期間の配置パターンが変更になった場合でも、基地局装置から移動局装置への通知を省略することが出来る。 As described above, the on period, the amount of extension of the activity period, the expiration value of the MBMS Extended Timer, the increase value of the expiration value, the presence / absence of counting up of each timer when overlapping with the subframe of MBMS transmission, etc. It may be a predetermined value or may be notified from the base station apparatus to the mobile station apparatus, but may be determined according to the arrangement pattern of the MBMS service period. For example, when the arrangement density of the MBMS service period is large, by increasing the increase value of the expiration value of the on period and the activity period, the data is set so that many unicast subframes are included in the extended activity period. Transmission and reception opportunities can be increased. At this time, by determining the method for deriving these values in common between the transmission device and the reception device, even when the MBMS service period arrangement pattern is changed, the base station device can notify the mobile station device. It can be omitted.
（まとめ）
　本発明の各実施の形態による通信技術によれば、間欠受信期間とＭＢＭＳサービス期間とが重複する場合であっても、データの送信を行い、かつ、移動局装置で受信することができるという効果がある。 (Summary)
According to the communication technique according to each embodiment of the present invention, even when the intermittent reception period and the MBMS service period overlap, the data can be transmitted and received by the mobile station apparatus. There is.
　本発明は、通信装置に利用可能である。 The present invention can be used for communication devices.

Claims (16)

  1. 　基地局装置と移動局装置とを含み、ＭＢＭＳサービスと非ＭＢＭＳサービスとを行なう通信システムであって、受信機が間欠受信を行なう通信システムにおいて、
    　ＭＢＭＳサービス期間と前記受信機の間欠受信期間とが重複する場合には、該受信機の間欠受信期間を拡大する制御を行うことを特徴とする通信システム。     In a communication system that includes a base station device and a mobile station device and performs an MBMS service and a non-MBMS service, in which a receiver performs intermittent reception,
    When the MBMS service period and the intermittent reception period of the receiver overlap, control is performed to expand the intermittent reception period of the receiver.
  2. 　ＭＢＭＳサービスと非ＭＢＭＳサービスの送信とを行なう基地局装置であって、受信機の間欠受信期間に合わせてデータを送信する期間をスケジューリングするスケジューリング手段を有する基地局装置において、
    　前記スケジュール手段は、ＭＢＭＳサービス期間と受信機へのデータ送信期間とが重複する場合には、受信機へのデータ送信期間をＭＢＭＳサービス期間外に移動して送信を行う制御を行うデータ送信期間制御部を有することを特徴とする基地局装置。     In a base station apparatus that performs transmission of an MBMS service and a non-MBMS service, and having a scheduling means for scheduling a period for transmitting data in accordance with an intermittent reception period of a receiver,
    When the MBMS service period and the data transmission period to the receiver overlap, the scheduling means performs data transmission period control for performing transmission by moving the data transmission period to the receiver outside the MBMS service period The base station apparatus characterized by having a part.
  3. 　ＭＢＭＳサービスと非ＭＢＭＳサービスを行なう通信システムにおいて間欠受信を行なう移動局装置であって、
    　間欠受信期間とＭＢＭＳサービス期間とが重複する場合には、前記間欠受信期間を拡大する制御を行う間欠受信期間制御部を有することを特徴とする移動局装置。     A mobile station apparatus that performs intermittent reception in a communication system that performs MBMS service and non-MBMS service,
    A mobile station apparatus comprising: an intermittent reception period control unit that performs control to expand the intermittent reception period when the intermittent reception period and the MBMS service period overlap.
  4. 　基地局装置と移動局装置とを含み、ＭＢＭＳサービスと非ＭＢＭＳサービスとを行なう通信システムであって、受信機が間欠受信を行なう通信システムにおいて、
    　ＭＢＭＳサービス期間と受信機の間欠受信期間とが重複する場合には、前記間欠受信期間を移動する制御を行うことを特徴とする通信システム。     In a communication system that includes a base station device and a mobile station device and performs an MBMS service and a non-MBMS service, in which a receiver performs intermittent reception,
    When the MBMS service period and the intermittent reception period of the receiver overlap, a communication system is characterized in that control is performed to move the intermittent reception period.
  5. 　ＭＢＭＳサービスと非ＭＢＭＳサービスを行なう通信システムにおいて間欠受信を行なう移動局装置であって、
    　間欠受信期間とＭＢＭＳサービス期間とが重複する場合には、前記間欠受信期間を移動する間欠受信期間制御部を有することを特徴とする移動局装置。     A mobile station apparatus that performs intermittent reception in a communication system that performs MBMS service and non-MBMS service,
    A mobile station apparatus comprising: an intermittent reception period control unit that moves the intermittent reception period when the intermittent reception period and the MBMS service period overlap.
  6. 　基地局装置と移動局装置とを含み、ＭＢＭＳサービスと非ＭＢＭＳサービスとを行なう通信システムであって、受信機が間欠受信を行なう通信システムにおいて、ＭＢＭＳサービス期間と前記間欠受信期間とが重複する場合には、重複を検出したタイミング以降において前記間欠受信期間を移動する制御を行うことを特徴とする通信システム。 In a communication system that includes a base station apparatus and a mobile station apparatus and performs an MBMS service and a non-MBMS service, and in which the receiver performs intermittent reception, the MBMS service period and the intermittent reception period overlap. In the communication system, the control is performed to move the intermittent reception period after the timing when the overlap is detected.
  7. 　ＭＢＭＳサービスと非ＭＢＭＳサービスとの送信を行なう基地局装置であって、受信機の間欠受信期間に合わせてデータを送信する期間をスケジューリングするスケジューリング手段を有する基地局装置において、
    　該スケジュール手段は、ＭＢＭＳサービス期間と受信機へのデータ送信期間とが重複する場合には、重複を検出したタイミング以降において受信機へのデータ送信期間をＭＢＭＳサービス期間外に移動して送信を行う制御を行うことを特徴とする基地局装置。     In a base station apparatus that performs transmission of an MBMS service and a non-MBMS service, and having a scheduling unit that schedules a period for transmitting data in accordance with an intermittent reception period of a receiver,
    When the MBMS service period and the data transmission period to the receiver overlap, the scheduling means performs transmission by moving the data transmission period to the receiver outside the MBMS service period after the timing when the overlap is detected. A base station apparatus that performs control.
  8. 　ＭＢＭＳサービスと非ＭＢＭＳサービスとを行なう通信システムにおいて間欠受信を行なう移動局装置であって、
    　間欠受信期間とＭＢＭＳサービス期間とが重複する場合には、重複を検出したタイミング以降の間欠受信期間を移動する間欠受信期間制御部を有することを特徴とする移動局装置。     A mobile station apparatus that performs intermittent reception in a communication system that performs MBMS service and non-MBMS service,
    A mobile station apparatus comprising: an intermittent reception period control unit that moves an intermittent reception period after a timing at which an overlap is detected when the intermittent reception period and the MBMS service period overlap.
  9. 　前記間欠受信期間と前記ＭＢＭＳサービス期間とが重複する場合の、間欠受信期間の拡大量もしくは移動量としては、あらかじめ定められた値を使用することを特徴とする請求項１、４又は６に記載の通信システム。 The predetermined value is used as an expansion amount or movement amount of the intermittent reception period when the intermittent reception period and the MBMS service period overlap. Communication system.
  10. 　前記間欠受信期間とＭＢＭＳサービス期間とが重複する場合の、間欠受信期間の拡大量もしくは移動量は、重複時までに移動局装置へ通知を行なうことを特徴とする請求項１、４、６、９に記載の通信システム。 The mobile station apparatus is notified of the amount of expansion or movement of the intermittent reception period when the intermittent reception period and the MBMS service period overlap, until the time of overlap. 10. The communication system according to 9.
  11. 　前記間欠受信期間の拡大量もしくは移動量は、ユニキャストサブフレーム期間で定義することを特徴とする請求項１、４、６、９、１０に記載の通信システム。 11. The communication system according to claim 1, 4, 6, 9, or 10, wherein the amount of expansion or movement of the intermittent reception period is defined by a unicast subframe period.
  12. 　前記間欠受信期間の拡大量もしくは移動量は、基地局装置によって指定されることを特徴とする請求項１、４、６、９から１１までのいずれか１項に記載の通信システム。 The communication system according to any one of claims 1, 4, 6, 9 to 11, wherein an expansion amount or movement amount of the intermittent reception period is specified by a base station device.
  13. 　前記間欠受信期間の拡大量もしくは移動量は、ＭＢＭＳサービス期間の配置パターンに応じて決定されることを特徴とする請求項１、４、６、９から１２までのいずれか１項に記載の通信システム。 The communication according to any one of claims 1, 4, 6, 9 to 12, wherein the amount of expansion or movement of the intermittent reception period is determined according to an arrangement pattern of MBMS service periods. system.
  14. 　ＭＢＭＳサービスと非ＭＢＭＳサービスとの送信を行なう送信装置であって、受信装置の間欠受信期間に合わせてデータを送信する期間をスケジューリングするスケジューリング手段を有する送信装置において、
    　該スケジュール手段は、ＭＢＭＳ期間と受信装置の間欠受信期間とを重複するように割り宛てるとともに、ＭＢＭＳ期間と受信装置へのデータ送信期間とが重複する場合に、受信装置へのデータ送信期間をＭＢＭＳ期間外に移動して送信を行うことを特徴とする送信装置。     In a transmission apparatus that performs transmission of an MBMS service and a non-MBMS service, and having a scheduling unit that schedules a period for transmitting data in accordance with the intermittent reception period of the reception apparatus,
    The scheduling means assigns the MBMS period and the intermittent reception period of the receiving apparatus so as to overlap each other, and sets the data transmission period to the receiving apparatus when the MBMS period and the data transmission period to the receiving apparatus overlap. A transmission apparatus characterized by moving outside the MBMS period and performing transmission.
  15. 　送信装置と受信装置とを含み、ＭＢＭＳサービスと非ＭＢＭＳサービスとを行なう通信システムであって、前記受信装置が間欠受信を行なう通信システムにおける通信方法において、
    　ＭＢＭＳサービス期間と前記受信装置における間欠受信期間とが重複するか否かを判定するステップと、
    　重複する場合に、前記間欠受信期間を、ＭＢＭＳサービス期間外を含むよう調整する制御を行うステップと、を有することを特徴とする通信方法。     In a communication system including a transmission device and a reception device and performing an MBMS service and a non-MBMS service, wherein the reception device performs intermittent reception,
    Determining whether an MBMS service period and an intermittent reception period in the receiving device overlap; and
    And a step of performing control to adjust the intermittent reception period to include outside the MBMS service period in the case of overlapping.
  16. 　請求項１５に記載の通信方法をコンピュータに実行させるためのプログラム。 A program for causing a computer to execute the communication method according to claim 15.
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