WO2018143246A1 - Terminal radioélectrique et station de base - Google Patents

Terminal radioélectrique et station de base Download PDF

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Publication number
WO2018143246A1
WO2018143246A1 PCT/JP2018/003137 JP2018003137W WO2018143246A1 WO 2018143246 A1 WO2018143246 A1 WO 2018143246A1 JP 2018003137 W JP2018003137 W JP 2018003137W WO 2018143246 A1 WO2018143246 A1 WO 2018143246A1
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mbms service
provision
transmission
notification
timing
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PCT/JP2018/003137
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English (en)
Japanese (ja)
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真人 藤代
ヘンリー チャン
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京セラ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Definitions

  • the present disclosure relates to a radio terminal and a base station for a mobile communication system.
  • MBMS Multimedia Broadcast Multicast Service
  • MBSFN Multicast Broadcast Single Frequency Network
  • SC-PTM Single Cell Point-To-Multipoint
  • wireless terminals targeting MTC (Machine Type Communication) and IoT (Internet of Things) services that perform communication without human intervention are being studied.
  • Such a wireless terminal is required to realize low cost, wide coverage, and low power consumption.
  • 3GPP a new category of wireless terminals in which the transmission / reception bandwidth is limited to only a part of the system transmission / reception band is specified.
  • An enhanced coverage function including repetitive transmission (repetition) and the like is applied to such a new category of wireless terminals.
  • a wireless terminal is a wireless terminal that receives an MBMS service provided from a base station using SC-PTM transmission.
  • the wireless terminal receives a suspension notification indicating that provision of the specific MBMS service is suspended while receiving a specific MBMS service using the SC-PTM transmission; and A control unit that interrupts reception of the specific MBMS service in response to reception of the suspension notification.
  • a base station provides an MBMS service using SC-PTM transmission.
  • the base station determines to interrupt the provision of the specific MBMS service using the SC-PTM transmission, and interrupts the provision of the specific MBMS service before interrupting the provision of the specific MBMS service.
  • a transmission unit that transmits an interruption notification indicating that the communication is to be performed to the wireless terminal.
  • a processor is a processor for a wireless terminal that receives an MBMS service provided from a base station using SC-PTM transmission.
  • the processor is configured to receive an interruption notification indicating that provision of the specific MBMS service is interrupted while receiving a specific MBMS service using the SC-PTM transmission, and the interruption notification. In response to the reception of the specific MBMS service.
  • a processor is a processor for a base station that provides an MBMS service using SC-PTM transmission.
  • the processor determines to interrupt the provision of a specific MBMS service using the SC-PTM transmission, and interrupts the provision of the specific MBMS service before interrupting the provision of the specific MBMS service. And a process of transmitting an interruption notification indicating that to the wireless terminal.
  • the communication control method includes a step of determining that a base station that provides an MBMS service using SC-PTM transmission interrupts the provision of a specific MBMS service using the SC-PTM transmission; Before the station interrupts the provision of the specific MBMS service, the station transmits a suspension notification indicating that the provision of the specific MBMS service is suspended to the wireless terminal; and the wireless terminal receives the suspension notification. And suspending reception of the specific MBMS service.
  • a wireless terminal receives an MBMS service provided using SC-PTM transmission.
  • the radio terminal uses the SC-MTCH within the current SC-MCCH change period to receive control information for the SC-MTCH and data belonging to the first MBMS service from the base station;
  • control information including predetermined notification information
  • the predetermined notification information is information indicating that transmission of data belonging to the second MBMS service is started within the next SC-MCCH change period.
  • a base station provides an MBMS service using SC-PTM transmission.
  • the base station determines that transmission of data belonging to a second MBMS service different from the first MBMS service being provided within the current SC-MCCH change period starts within the next SC-MCCH change period
  • a transmission unit that transmits control information for the SC-MTCH and data belonging to the first MBMS service to the wireless terminal using SC-MTCH within the current SC-MCCH change period; Is provided.
  • the transmission unit transmits the control information including predetermined notification information indicating that transmission of data belonging to the second MBMS service is started within the next SC-MCCH change period.
  • a wireless terminal receives an MBMS service provided using SC-PTM transmission.
  • the radio terminal uses the SC-MTCH within the current SC-MCCH change period to receive control information for the SC-MTCH and data belonging to the first MBMS service from the base station;
  • a control unit that determines that provision of a second MBMS service different from the first MBMS service is started within the next SC-MCCH change period based on the control information.
  • the receiving unit receives predetermined notification information associated with an identifier of the second MBMS service from the base station within the current SC-MCCH change period.
  • the control unit identifies the second MBMS service based on the predetermined notification information.
  • a base station provides an MBMS service using SC-PTM transmission.
  • the base station determines to start providing a second MBMS service different from the first MBMS service provided within the current SC-MCCH change cycle within the next SC-MCCH change cycle;
  • a transmitting unit that transmits control information for the SC-MTCH and data belonging to the first MBMS service to a wireless terminal using SC-MTCH within the current SC-MCCH change period; .
  • the transmission unit transmits predetermined notification information associated with the identifier of the second MBMS service to the wireless terminal within the current SC-MCCH change period.
  • a wireless terminal receives an MBMS service provided from a network using a predetermined multicast / broadcast transmission scheme.
  • the wireless terminal receives, from the network, identification information of a specific MBMS service that is not provided using the predetermined multicast / broadcast transmission method, and a control unit that acquires service information regarding a plurality of MBMS services provided from the network A receiving unit.
  • the control unit recognizes the specific MBMS service that is not provided using the predetermined multicast / broadcast transmission scheme based on the identification information.
  • An apparatus is included in a network that provides an MBMS service to a wireless terminal using a predetermined multicast / broadcast transmission scheme.
  • the apparatus includes a control unit that determines a specific MBMS service that is not provided using the predetermined multicast / broadcast transmission method among a plurality of MBMS services that can be provided to the wireless terminal.
  • the control unit notifies the identification information of the specific MBMS service to the wireless terminal.
  • a wireless terminal receives an MBMS service provided from a network using a predetermined multicast / broadcast transmission scheme.
  • the wireless terminal includes a control unit that acquires service information regarding a plurality of MBMS services provided from the network.
  • the service information includes the provision start time of each MBMS service.
  • the control unit starts a timer in response to the provision of a specific MBMS service in which the wireless terminal is interested in reception not being started at the provision start time.
  • the control unit waits for the start of provision of the specific MBMS service while the timer is operating.
  • a wireless terminal receives an MBMS service provided from a base station using SC-PTM transmission.
  • the radio terminal receives an interruption notification indicating that provision of the specific MBMS service is temporarily interrupted from the base station while receiving the specific MBMS service using the SC-PTM transmission.
  • a control unit that interrupts reception of the MBMS service at a first timing in response to reception of the suspension notification.
  • the control unit resumes reception of the MBMS service at a second timing after interrupting reception of the SC-MTCH.
  • a base station provides an MBMS service using SC-PTM transmission.
  • the base station determines to temporarily interrupt the provision of a specific MBMS service using the SC-PTM transmission, and provides the MBMS service before interrupting the provision of the specific MBMS service.
  • a transmission unit that transmits an interruption notification indicating interruption temporarily to the wireless terminal.
  • SIB20 SIB20 concerning an embodiment. It is a figure which shows the MBMS control information in SC-MCCH which concerns on embodiment. It is a figure which shows the downlink physical channel for eMTC UE which concerns on embodiment. It is a figure which shows the random access procedure for eMTC UE and NB-IoT UE which concern on embodiment. It is a figure which shows the operation example which concerns on 1st Embodiment. It is a figure which shows the 1st method which concerns on the example 1 of a change of 1st Embodiment. It is a figure which shows the 3rd method which concerns on the example 1 of a change of 1st Embodiment.
  • the mobile communication system according to the embodiment is an LTE (Long Term Evolution) system whose specifications are defined by 3GPP.
  • FIG. 1 is a diagram illustrating a configuration of an LTE system according to the embodiment.
  • FIG. 2 is a diagram illustrating a network configuration related to MBMS.
  • the LTE system includes a radio terminal (UE: User Equipment) 100, a radio access network (E-UTRAN: Evolved-UMTS Terrestrial Radio Access Network) 10, and a core network (EPC: Evolved Packet Core) 20. Is provided.
  • the E-UTRAN 10 and the EPC 20 constitute an LTE system network.
  • the UE 100 is a mobile communication device.
  • the UE 100 performs radio communication with the eNB 200 that manages a cell (serving cell) in which the UE 100 is located.
  • the E-UTRAN 10 includes a base station (eNB: evolved Node-B) 200.
  • the eNB 200 is connected to each other via the X2 interface.
  • the eNB 200 manages one or a plurality of cells.
  • the eNB 200 performs radio communication with the UE 100 that has established a connection with the own cell.
  • the eNB 200 has a radio resource management (RRM) function, a routing function of user data (hereinafter simply referred to as “data”), a measurement control function for mobility control / scheduling, and the like.
  • RRM radio resource management
  • Cell is used as a term indicating a minimum unit of a wireless communication area.
  • the “cell” is also used as a term indicating a function or resource for performing wireless communication with the UE 100.
  • the EPC 20 includes a mobility management entity (MME) and a serving gateway (S-GW) 300.
  • MME performs various mobility control etc. with respect to UE100.
  • S-GW performs data transfer control.
  • the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
  • the E-UTRAN 10 includes an MCE (Multi-Cell / Multicast Coordinating Entity) 11.
  • the MCE 11 is connected to the eNB 200 via the M2 interface.
  • the MCE 11 is connected to the MME 300 via the M3 interface (see FIG. 2).
  • the MCE 11 performs MBSFN radio resource management / allocation and the like. Specifically, the MCE 11 performs MBSFN transmission scheduling. On the other hand, scheduling of SC-PTM transmission is performed by the eNB 200.
  • the EPC 20 includes an MBMS GW (MBMS Gateway) 21.
  • the MBMS GW 21 is connected to the eNB 200 via the M1 interface.
  • the MBMS GW 21 is connected to the MME 300 via the Sm interface.
  • the MBMS GW 21 is connected to the BM-SC 22 via the SG-mb and SGi-mb interfaces (see FIG. 2).
  • the MBMS GW 21 performs IP multicast data transmission, session control, and the like for the eNB 200.
  • the EPC 20 includes a BM-SC (Broadcast Multicast Service Center) 22.
  • the BM-SC 22 is connected to the MBMS GW 21 via the SG-mb and SGi-mb interfaces.
  • the EPC 20 is connected to the P-GW 23 via the SGi interface (see FIG. 2).
  • the BM-SC 22 performs management / allocation of TMGI (Temporary Mobile Group Identity).
  • GCS AS31 is an application server for group communication.
  • the GCS AS 31 is connected to the BM-SC 22 via MB2-U and MB2-C interfaces.
  • the GCS AS 31 is connected to the P-GW 23 via the SGi interface.
  • the GCS AS 31 performs group management and data distribution in group communication.
  • FIG. 3 is a diagram illustrating a configuration of the UE 100 (wireless terminal) according to the embodiment. As illustrated in FIG. 3, the UE 100 includes a reception unit 110, a transmission unit 120, and a control unit 130.
  • the receiving unit 110 performs various types of reception under the control of the control unit 130.
  • the receiving unit 110 includes an antenna and a receiver.
  • the receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs the baseband signal to the control unit 130.
  • the transmission unit 120 performs various transmissions under the control of the control unit 130.
  • the transmission unit 120 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output from the control unit 130 into a radio signal and transmits it from the antenna.
  • the control unit 130 performs various controls in the UE 100.
  • the control unit 130 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor and a CPU (Central Processing Unit).
  • the baseband processor performs modulation / demodulation and encoding / decoding of the baseband signal.
  • the CPU performs various processes by executing programs stored in the memory.
  • the processor may include a codec that performs encoding / decoding of an audio / video signal.
  • the processor executes various processes described later.
  • FIG. 4 is a diagram illustrating a configuration of the eNB 200 (base station) according to the embodiment.
  • the eNB 200 includes a transmission unit 210, a reception unit 220, a control unit 230, and a backhaul communication unit 240.
  • the transmission unit 210 performs various transmissions under the control of the control unit 230.
  • the transmission unit 210 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output from the control unit 230 into a radio signal and transmits it from the antenna.
  • the receiving unit 220 performs various types of reception under the control of the control unit 230.
  • the receiving unit 220 includes an antenna and a receiver.
  • the receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs the baseband signal to the control unit 230.
  • the control unit 230 performs various controls in the eNB 200.
  • the control unit 230 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor and a CPU.
  • the baseband processor performs modulation / demodulation and encoding / decoding of the baseband signal.
  • the CPU performs various processes by executing programs stored in the memory.
  • the processor executes various processes described later.
  • the backhaul communication unit 240 is connected to an adjacent eNB via the X2 interface.
  • the backhaul communication unit 240 is connected to the MME / S-GW 300 via the S1 interface.
  • the backhaul communication unit 240 is used for communication performed on the X2 interface, communication performed on the S1 interface, and the like.
  • the backhaul communication unit 240 can also be used for communication performed on the M1 interface and communication performed on the M2 interface.
  • FIG. 5 is a diagram showing a protocol stack of a radio interface in the LTE system.
  • the radio interface protocol is divided into first to third layers of the OSI reference model.
  • the first layer is a physical (PHY) layer.
  • the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
  • the third layer includes an RRC (Radio Resource Control) layer.
  • the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Between the physical layer of the UE 100 and the physical layer of the eNB 200, data and control signals are transmitted via a physical channel.
  • the MAC layer performs data priority control, retransmission processing by HARQ (Hybrid ARQ), and the like. Between the MAC layer of the UE 100 and the MAC layer of the eNB 200, data and control signals are transmitted via the transport channel.
  • the MAC layer of the eNB 200 includes a scheduler. The scheduler determines the uplink / downlink transport format (transport block size, modulation / coding scheme (MCS)) and the resource blocks allocated to the UE 100.
  • MCS modulation / coding scheme
  • the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data and control signals are transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 via a logical channel.
  • the PDCP layer performs header compression / decompression and encryption / decryption.
  • the RRC layer is defined only in the control plane that handles control signals. Messages for various settings (RRC messages) are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
  • the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
  • RRC connection connection between the RRC of the UE 100 and the RRC of the eNB 200
  • the UE 100 is in the RRC connected mode.
  • RRC connection When there is no connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in the RRC idle mode.
  • the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
  • FIG. 6 is a diagram illustrating a configuration of a downlink channel of the LTE system.
  • FIG. 6A shows the mapping between the logical channel (Downlink Logical Channel) and the transport channel (Downlink Transport Channel).
  • PCCH Paging Control Channel
  • PCH PCH
  • BCCH Broadcast Control Channel
  • BCCH Broadcast Control Channel
  • DL-SCH Downlink Shared Channel
  • CCCH Common Control Channel
  • CCCH is a logical channel for transmission control information between the UE 100 and the eNB 200.
  • the CCCH is used when the UE 100 does not have an RRC connection with the network.
  • CCCH is mapped to DL-SCH.
  • DCCH (Dedicated Control Channel) is a logical channel for transmitting individual control information between the UE 100 and the network.
  • the DCCH is used when the UE 100 has an RRC connection.
  • DCCH is mapped to DL-SCH.
  • DTCH (Dedicated Traffic Channel) is an individual logical channel for data transmission. DTCH is mapped to DL-SCH.
  • SC-MTCH Single Cell Multicast Traffic Channel
  • SC-MTCH is a logical channel for SC-PTM transmission.
  • SC-MTCH is a point-to-multipoint downlink channel for multicast transmission of data (MBMS) from the network to UE 100 using SC-PTM transmission.
  • MBMS multicast transmission of data
  • SC-MCCH Single Cell Multicast Control Channel
  • the SC-MCCH is a point-to-multipoint downlink channel for multicast transmission of MBMS control information for one or more SC-MTCHs from the network to the UE 100.
  • SC-MCCH is used for UE 100 that receives or is interested in receiving MBMS using SC-PTM transmission. Also, only one SC-MCCH exists in one cell.
  • MCCH Multicast Control Channel
  • MCH Multicast Channel
  • MTCH Multicast Traffic Channel
  • FIG. 6B shows a mapping between a transport channel (Downlink Transport Channel) and a physical channel (Downlink Physical Channel).
  • BCH is mapped to PBCH (Physical Broadcast Channel).
  • PBCH Physical Broadcast Channel
  • MCH is mapped to PMCH (Physical Multicast Channel). MCH supports MBSFN transmission by multiple cells.
  • PCH and DL-SCH are mapped to PDSCH (Physical Downlink Shared Channel).
  • PDSCH Physical Downlink Shared Channel
  • DL-SCH supports HARQ, link adaptation, and dynamic resource allocation.
  • PDCCH carries PDSCH (DL-SCH, PCH) resource allocation information, HARQ information related to DL-SCH, and the like.
  • the PDCCH carries an uplink scheduling grant.
  • FIG. 7 is a diagram illustrating a configuration of a radio frame of the LTE system.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the radio frame is composed of 10 subframes arranged in the time direction.
  • Each subframe is composed of two slots arranged in the time direction.
  • the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
  • Each subframe includes a plurality of resource blocks (RB) in the frequency direction.
  • Each subframe includes a plurality of symbols in the time direction.
  • Each resource block includes a plurality of subcarriers in the frequency direction.
  • One symbol and one subcarrier constitute one resource element (RE).
  • radio resources time / frequency resources allocated to the UE 100
  • frequency resources can be specified by resource blocks, and time resources can be specified by subframes (or slots).
  • the section of the first few symbols of each subframe is an area mainly used as a PDCCH for transmitting a downlink control signal.
  • the remaining part of each subframe is an area that can be used mainly as a PDSCH for transmitting downlink data.
  • an MBSFN subframe that is a subframe for MBSFN transmission can be set.
  • both ends in the frequency direction in each subframe are regions used mainly as PUCCH for transmitting an uplink control signal.
  • the remaining part in each subframe is an area that can be used mainly as a PUSCH for transmitting uplink data.
  • the UE 100 may receive the MBMS service in the RRC connected mode.
  • the UE 100 may receive the MBMS service in the RRC idle mode.
  • FIG. 8 is a diagram showing an operation example of SC-PTM transmission.
  • step S ⁇ b> 1 the UE 100 acquires a USD (User Service Description) from the EPC 20 via the eNB 200.
  • USD provides basic information for each MBMS service.
  • the USD includes, for each MBMS service, TMGI for identifying the MBMS service, a frequency at which the MBMS service is provided, and provision start / end times of the MBMS service.
  • UE100 receives SIB20 from eNB200 via BCCH.
  • the SIB 20 includes information (scheduling information) necessary for acquiring the SC-MCCH.
  • FIG. 9 is a diagram showing the SIB 20.
  • the SIB 20 includes a sc-mcch-ModificationPeriod indicating a period in which the contents of the SC-MCCH can be changed (SC-MCCH change period), a sc-mcch-RepetionPeriod indicating the SC-MCCH transmission (retransmission) time interval in terms of the number of radio frames, Sc-mcch-Offset indicating the offset of the radio frame on which the SC-MCCH is scheduled, sc-mcch-Subframe indicating the subframe on which the SC-MCCH is scheduled, and the like.
  • step S3 the UE 100 receives MBMS control information from the eNB 200 via the SC-MCCH based on the SIB20.
  • the MBMS control information may be referred to as SC-PTM setting information (SCPTM Configuration).
  • SC-RNTI Single Cell RNTI
  • FIG. 10 is a diagram showing MBMS control information (SC-PTM setting information) in SC-MCCH.
  • the SC-PTM setting information includes control information applicable to the MBMS service transmitted via SC-MRB (Single Cell MBMS Point to Multipoint Radio Bearer).
  • the SC-PTM setting information includes sc-mtch-InfoList including the setting of each SC-MTCH in the cell that transmits the information, and scptmNeighbourCellList that is a list of neighboring cells that provide the MBMS service via the SC-MRB.
  • the sc-mtch-InfoList includes one or more SC-MTCH-Info.
  • Each SC-MTCH-Info includes information on the MBMS session in progress (mbmsSessionInfo) transmitted via the SC-MRB, a G-RNTI (Group RNTI) corresponding to the MBMS session, and DRX for the SC-MTCH. It contains sc-mtch-schedulingInfo which is information.
  • the mbmsSessionInfo includes a TMGI that identifies the MBMS service and a session ID (sessionId).
  • G-RNTI is an RNTI that identifies a multicast group (specifically, an SC-MTCH addressed to a specific group).
  • G-RNTI is mapped one-to-one with TMGI.
  • sc-mtch-schedulingInfo includes onDurationTimerSCPTM, drx-InactivityTimerSCPTM, schedulingPeriodStartOffsetSCPTM.
  • the schedulingPeriodOffsetSCPTM includes SC-MTCH-SchedulingCycle and SC-MTCH-SchedulingOffset.
  • step S4 the UE 100 receives the MBMS service (MBMS data) corresponding to the TMGI that it is interested in via the SC-MTCH based on the SC-MTCH-SchedulingInfo in the SC-PTM setting information.
  • the eNB 200 transmits the PDCCH using G-RNTI, and then transmits MBMS data via the PDSCH.
  • control signal (signaling) described with reference to FIG. 8 is an example. Some of the control signals may be appropriately omitted or the order of the control signals may be changed by optimization for power saving reception or the like.
  • the UE 100 in a new category is a UE 100 whose transmission / reception bandwidth is limited to only a part of the system transmission / reception band.
  • the new UE categories are referred to as, for example, category M1 and NB (Narrow Band) -IoT category.
  • the category M1 is an eMTC (enhanced machine type communications) UE.
  • the NB-IoT UE is category NB1.
  • the category M1 limits the transmission / reception bandwidth of the UE 100 to 1.08 MHz (that is, the bandwidth of 6 resource blocks).
  • the category M1 supports an enhanced coverage (EC) function using repeated transmission or the like.
  • the NB-IoT category further restricts the transmission / reception bandwidth of the UE 100 to 180 kHz (that is, the bandwidth of one resource block).
  • the NB-IoT category supports the enhanced coverage function.
  • Repeat transmission is a technique for repeatedly transmitting the same signal using a plurality of subframes.
  • the system bandwidth of the LTE system is 10 MHz, of which the transmission / reception bandwidth is 9 MHz (that is, the bandwidth of 50 resource blocks).
  • the UE 100 of category M1 cannot receive a downlink radio signal transmitted with a bandwidth wider than 6 resource blocks, it cannot receive a normal PDCCH.
  • MPDCCH MTC-PDCCH
  • NPDCCH NB-PDCCH
  • NB-PDCCH PDCCH for NB-IoT
  • the enhanced coverage function may include repeated transmission (Repetition) for repeatedly transmitting the same signal.
  • the coverage can be enhanced as the number of repeated transmissions increases.
  • the enhanced coverage function may include a power boost that increases the power density of the transmission signal.
  • the power density is increased by narrowband transmission that narrows the frequency bandwidth of the transmission signal.
  • the coverage can be enhanced as the power density of the transmission signal is increased.
  • the enhanced coverage function may include low MCS (Lower MCS) transmission that lowers the MCS used for the transmission signal. Coverage can be enhanced by performing transmission using MCS with a low data rate and high error tolerance.
  • FIG. 11 is a diagram showing a downlink physical channel for eMTC UE.
  • the eNB 200 transmits the MPDCCH within 6 resource blocks.
  • MPDCCH includes scheduling information for allocating PDSCH.
  • MPDCCH allocates PDSCH of a subframe different from the subframe in which the MPDCCH is transmitted.
  • the eNB 200 transmits the PDSCH within 6 resource blocks.
  • the eNB 200 allocates a PDSCH over a plurality of subframes in order to repeatedly transmit the same signal.
  • the UE 100 of category M1 specifies the assigned PDSCH by receiving the MPDCCH, and receives data transmitted on the assigned PDSCH.
  • FIG. 12 is a diagram showing a random access procedure for eMTC UE and NB-IoT UE.
  • the UE 100 In the initial state of FIG. 12, the UE 100 is in the RRC idle mode. The UE 100 executes a random access procedure in order to transition to the RRC connected mode.
  • UE100 has selected the cell of eNB200 as a serving cell.
  • the UE 100 does not satisfy the first cell selection criterion (first S-criteria) for normal coverage, and satisfies the second cell selection criterion (second S-criteria) for enhanced coverage In this case, it may be determined that the user is in the enhanced coverage.
  • “UE in enhanced coverage” means a UE that is required to use an enhanced coverage function (enhanced coverage mode) to access a cell. Note that eMTC UE must use the enhanced coverage mode.
  • the eNB 200 transmits PRACH (Physical Random Access Channel) related information by broadcast signaling (for example, SIB).
  • the PRACH related information includes various parameters provided for each enhanced coverage level. As an example, for the enhanced coverage level, a total of four levels of enhanced coverage levels 0 to 3 are defined. Various parameters include an RSRP (Reference Signal Received Power) threshold, a PRACH resource, and the maximum number of preamble transmissions.
  • the PRACH resource includes a radio resource (time / frequency resource) and a signal sequence (preamble sequence). The UE 100 stores the received PRACH related information.
  • step S1002 UE100 measures RSRP based on the reference signal transmitted from eNB200.
  • the UE 100 determines its own enhanced coverage level by comparing the measured RSRP with the RSRP threshold value for each enhanced coverage level.
  • the enhanced coverage level indicates the degree of enhanced coverage required for the UE 100.
  • the enhanced coverage level is associated with at least the number of transmissions (that is, the number of repetitions) in repeated transmission.
  • step S1004 the UE 100 selects a PRACH resource corresponding to its enhanced coverage level.
  • step S1005 the UE 100 transmits Msg 1 (random access preamble) to the eNB 200 using the selected PRACH resource.
  • the eNB 200 specifies the enhanced coverage level of the UE 100 based on the PRACH resource used for the received Msg 1.
  • step S1006 the eNB 200 transmits Msg 2 (random access response) including scheduling information indicating the PUSCH resource allocated to the UE 100 to the UE 100.
  • the UE 100 can transmit Msg 1 a plurality of times up to the maximum number of preamble transmissions corresponding to its own enhanced coverage level until it normally receives Msg 2.
  • step S1007 the UE 100 transmits Msg 3 to the eNB 200 based on the scheduling information.
  • Msg 3 may be an RRC Connection Request message.
  • step S1008 the eNB 200 transmits Msg 4 to the UE 100.
  • step S1009 the UE 100 transitions to the RRC connected mode in response to reception of Msg 4. Thereafter, the eNB 200 controls repeated transmission to the UE 100 based on the identified enhanced coverage level.
  • the first embodiment will be described on the premise of the mobile communication system as described above.
  • the first embodiment assumes a scenario in which firmware or the like is distributed collectively by SC-PTM transmission to the above-described new category UE (eMTC UE or NB-IoT UE) 100. Further, it is assumed that the UE 100 in the RRC idle mode mainly receives an MBMS service provided by SC-PTM transmission.
  • ENB 200 transmits MBMS control information (SC-PTM setting information) to UE 100 using SC-MCCH, which is a logical channel.
  • SC-MCCH is mapped to PDSCH which is a physical channel.
  • the PDSCH is scheduled by MPDCCH or NPDCCH (referred to as “(M / N) PDCCH” as appropriate) transmitted using SC-RNTI.
  • the eNB 200 transmits data (MBMS data) belonging to the MBMS service to the UE 100 using SC-MTCH which is a logical channel.
  • SC-MTCH is mapped to PDSCH, which is a physical channel.
  • the PDSCH is scheduled by (M / N) PDCCH transmitted using G-RNTI.
  • the first notification is one bit in the (M / N) PDCCH transmitted using SC-RNTI.
  • the first notification indicates whether the SC-MCCH has been changed.
  • the second notification is one bit in the (M / N) PDCCH transmitted using G-RNTI.
  • the second notification indicates whether the SC-MTCH setting of the MBMS service (TMGI) corresponding to the G-RNTI is changed within the next SC-MCCH change period. “Changed within the next SC-MCCH change period” is synonymous with changing from the next SC-MCCH change boundary (Modification Boundary).
  • 3rd notification is 1 bit in (M / N) PDCCH transmitted using G-RNTI.
  • the third notification indicates whether a new MBMS service is started within the next SC-MCCH change period.
  • the third notification may be used for the UE 100 receiving the ongoing MBMS service to detect that another MBMS service is started.
  • the first to third notifications may be referred to as “Direct indication”. Although an example in which the notification is configured with 1 bit has been described, the notification may be configured with a plurality of bits.
  • the first embodiment is an embodiment relating to a notification (third notification) indicating whether or not a new MBMS service is started within the next SC-MCCH change period.
  • An MBMS service may be read as an MBMS session.
  • the eNB 200 provides an MBMS service using SC-PTM transmission.
  • the control unit 230 of the eNB 200 determines that transmission of data belonging to the second MBMS service different from the first MBMS service being provided within the current SC-MCCH change cycle starts within the next SC-MCCH change cycle. To do.
  • the transmission unit 210 of the eNB 200 uses the SC-MTCH within the current SC-MCCH change period to transmit control information (DCI: Downlink Control Information) for SC-MTCH and data belonging to the first MBMS service to the UE 100. Send to.
  • the transmission unit 210 of the eNB 200 transmits control information for SC-MTCH using the (M / N) PDCCH using G-RNTI.
  • the transmission unit 210 of the eNB 200 transmits MBMS data using the PDSCH indicated by the (M / N) PDCCH.
  • the transmission unit 210 of the eNB 200 transmits control information including predetermined notification information indicating that transmission of data belonging to the second MBMS service is started within the next SC-MCCH change period.
  • the predetermined notification information can be regarded as an SC-MTCH start notification.
  • the predetermined notification information may be information indicating that SC-MCCH (SC-PTM configuration information) is changed due to the second MBMS service.
  • the predetermined notification information can be regarded as an SC-MCCH change notification.
  • the UE 100 receives an MBMS service provided using SC-PTM transmission.
  • the receiving unit 110 of the UE 100 receives SC-MTCH control information and data belonging to the first MBMS service from the eNB 200 using SC-MTCH within the current SC-MCCH change period.
  • the control unit 130 of the UE 100 starts transmission of data belonging to the second MBMS service different from the first MBMS service within the next SC-MCCH change period in response to the control information including predetermined notification information. Judge that it will be.
  • the predetermined notification information is information indicating that transmission of data belonging to the second MBMS service is started within the next SC-MCCH change period (that is, SC-MTCH start notification).
  • the predetermined notification information is information indicating that the SC-MCCH (SC-PTM configuration information) is changed due to the second MBMS service (that is, a new MBMS service) (that is, SC-MCCH change notification). It may be.
  • the predetermined notification information may be composed of 1 bit.
  • the predetermined notification information is SC-MTCH start notification, transmission of SC-MTCH is started from the next SC-MCCH modification boundary.
  • the predetermined notification information is an SC-MCCH change notification
  • the following first and second operations can be considered.
  • the SC-MTCH starts transmission from the next SC-MCCH modification boundary (that is, the second SC-MCCH modification boundary) of the next SC-MCCH modification boundary.
  • the next modification boundary transmission of the modified SC-MCCH is started, but it may take up to 1 SC-MCCH change period (1 modification period) before it reaches all UEs.
  • eNB 200 starts transmission of SC-MTCH after waiting for one SC-MCCH change period.
  • UE 100 starts receiving SC-MTCH after waiting for one SC-MCCH change period.
  • transmission of SC-MTCH is started from the next SC-MCCH modification boundary.
  • transmission of the modified SC-MCCH is started, and it is assumed that the UE 100 receives the SC-MCCH.
  • SC-MTCH transmission / reception can be performed from the next SC-MCCH modification boundary.
  • the control unit 130 of the UE 100 when the UE 100 is receiving the first MBMS service (that is, the ongoing MBMS service), the control unit 130 of the UE 100 performs the next SC-MCCH change cycle based on the predetermined notification information. It can be detected that another MBMS service is started. The control unit 130 of the UE 100 may attempt to receive the SC-MCCH within the next SC-MCCH change period when interested in an MBMS service other than the ongoing MBMS service.
  • FIG. 13 is a diagram illustrating an operation example according to the first embodiment.
  • FIG. 13 is a diagram focusing on the logical channel, and repeated transmission in the physical layer is not shown.
  • the SC-MCCH change cycle T1 starts from an SC-MCCH change boundary (SC-MCCH modification boundary) t1.
  • the eNB 200 transmits the SC-MTCH corresponding to the first MBMS service (On-going session) a plurality of times (three times in the example shown in FIG. 13) within the SC-MCCH change period T1.
  • the UE 100 receives the SC-MTCH.
  • the eNB 200 determines to notify the UE 100 of the start of the second MBMS service (New session).
  • the SC-MCCH change period T2 starts from the SC-MCCH change boundary t2.
  • the eNB 200 transmits the SC-MTCH corresponding to the first MBMS service (On-going session) a plurality of times within the SC-MCCH change period T2.
  • the eNB 200 transmits SC-MTCH control information (DCI) using the (M / N) PDCCH using G-RNTI.
  • the eNB 200 notifies the UE 100 that the second MBMS service (New session) is started within the next SC-MCCH change cycle T3 by including predetermined notification information in the control information (in FIG. 13). “Notify”).
  • the UE 100 can grasp that a new MBMS service is started, but cannot know which MBMS service is started.
  • the SC-MCCH change period T3 starts from the SC-MCCH change boundary t3.
  • the eNB 200 transmits the changed SC-MCCH (SC-MCCH changed) within the SC-MCCH change period T3.
  • the changed SC-MCCH includes the SC-MTCH setting of the second MBMS service (New session).
  • the eNB 200 starts transmitting the SC-MTCH of the second MBMS service while continuing to transmit the SC-MTCH of the first MBMS service within the SC-MCCH change period T3.
  • the eNB 200 may start the SC-MTCH transmission of the second MBMS service within the SC-MCCH change period next to the SC-MCCH change period T3.
  • the UE 100 can grasp that a new MBMS service is started based on predetermined 1-bit notification information, but grasps which MBMS service is started. That is not always easy. In particular, when a plurality of new MBMS services are started simultaneously (or continuously), it is extremely difficult to grasp which MBMS service is started. Therefore, even if the UE 100 attempts to receive a new MBMS service (New session) within the next SC-MCCH change period, the new MBMS service may be an MBMS service that the UE 100 is not interested in. In such a case, there is a problem that the power consumption of the UE 100 is wasted or reception of the first MBMS service (On-going session) is hindered.
  • Modification 1 of the first embodiment is a modification that attempts to solve such a problem.
  • the eNB 200 according to the first modification of the first embodiment provides an MBMS service using SC-PTM transmission.
  • the control unit 230 of the eNB 200 determines to start providing a second MBMS service different from the first MBMS service provided within the current SC-MCCH change cycle within the next SC-MCCH change cycle.
  • the transmission unit 210 of the eNB 200 transmits SC-MTCH control information and data belonging to the first MBMS service to the UE 100 using SC-MTCH within the current SC-MCCH change period. Transmitting section 210 transmits predetermined notification information associated with the identifier of the second MBMS service to UE 100 within the current SC-MCCH change period.
  • the UE 100 receives an MBMS service provided using SC-PTM transmission.
  • the receiving unit 110 of the UE 100 receives control information for SC-MTCH and data belonging to the first MBMS service from the eNB 200 within the current SC-MCCH change period. Based on the control information, the control unit 130 of the UE 100 determines that provision of a second MBMS service different from the first MBMS service is started within the next SC-MCCH change period.
  • the receiving unit 110 receives predetermined notification information associated with the identifier of the second MBMS service from the eNB 200 within the current SC-MCCH change period.
  • the controller 130 identifies the second MBMS service based on the predetermined notification information.
  • the predetermined notification information according to the first modification of the first embodiment is transmitted in a manner that can identify the MBMS service (New session) that starts within the next SC-MCCH change cycle.
  • the transmission timing of the predetermined notification information is associated with the identifier of the second MBMS service (New session).
  • the transmission unit 210 of the eNB 200 transmits control information (DCI) including predetermined notification information at a transmission timing associated with the identifier of the second MBMS service.
  • the control unit 130 of the UE 100 identifies the second MBMS service based on the reception timing of control information including predetermined notification information.
  • FIG. 14 is a diagram illustrating a first method according to the first modification of the first embodiment.
  • the eNB 200 transmits mapping information indicating a correspondence relationship between the identifier (TMGI) of the second MBMS service and the timing to the UE 100.
  • UE100 grasps
  • the timing may be expressed by a frame number.
  • the frame number may be at least one of a system frame number (SFN), a subframe number, and a hyper system frame number (H-SFN).
  • the timing may be expressed by a relative timing based on the SC-MCCH change boundary.
  • the timing may be defined by the number of PDCCH monitoring periods (On duration) in the DRX cycle on the basis of the SC-MCCH change boundary.
  • the eNB 200 may transmit the mapping information by SIB (for example, SIB20) or SC-MCCH.
  • SIB for example, SIB20
  • SC-MCCH SC-MCCH
  • a device other than the eNB 200 may notify the UE 100 of mapping information.
  • the BM-SC 22 or MME 300
  • a TMGI index may be included in the mapping information.
  • the index may be an index of a TMGI list in SC-MCCH.
  • the index may be an index of SAI (Service Area Identity) in SIB type 15 (SIB15). Since SAI is associated with TMGI in the USD, it is possible to indirectly indicate TMGI using the SAI index.
  • SAI Service Area Identity
  • step S102 the eNB 200 determines the transmission timing of the predetermined notification information based on the TMGI of the second MBMS service (New session).
  • step S103 the eNB 200 transmits control information including predetermined notification information to the UE 100 via the (M / N) PDCCH at the determined timing.
  • step S104 the UE 100 grasps the TMGI of the second MBMS service based on the reception timing of control information including predetermined notification information.
  • the predetermined notification information is composed of 1 bit, but in the second method, the predetermined notification information is composed of a plurality of bits.
  • the predetermined notification information is a TMGI of the second MBMS service or an index of the TMGI.
  • the transmission unit 210 of the eNB 200 transmits control information (DCI) including predetermined notification information.
  • the index may be defined in a manner similar to the first method. Therefore, UE100 can grasp
  • the TMGI index may be associated with each bit of the bit string constituting the notification information. That is, each bit position in the notification information indicates TMGI or its index.
  • the eNB 200 transmits mapping information indicating a correspondence relationship between TMGI or an index thereof and a bit position to the UE 100. For example, it is assumed that the notification information is 3 bits, the first bit is associated with TMGI A, the next bit is associated with TMGI B, and the next bit is associated with TMGI C. Under such a premise, when starting to provide the TMGI B MBMS service, the eNB 200 transmits “010” as the notification information. The UE 100 recognizes that provision of the TMGI B MBMS service is started based on the notification information and the mapping information.
  • the third method is a method of transmitting the TMGI of the second MBMS service (New session) or the index of the TMGI by PDSCH. Specifically, one bit in the control information (DCI) notifies that the second MBMS service is started, and is applicable by the MAC control element (MAC CE) transmitted on the PDSCH indicated by the control information.
  • TMGI is shown.
  • the TMGI indicated by the MAC CE may be plural (list shape).
  • FIG. 15 is a diagram illustrating a third method according to the first modification of the first embodiment.
  • the eNB 200 transmits control information including a 1-bit notification indicating that a new MBMS service is started within the next SC-MCCH change period to the UE 100 using the (M / N) PDCCH.
  • the control information includes scheduling information indicating PDSCH allocation.
  • the UE 100 determines that a new MBMS service is started within the next SC-MCCH change period based on the 1-bit notification.
  • step S132 the eNB 200 transmits the TMGI of the second MBMS service (New session) or the MAC CE including the index of the TMGI to the UE 100 through the PDSCH.
  • the UE 100 grasps the TMGI of the second MBMS service based on the MAC CE.
  • the operation according to the first modification of the first embodiment may be applied to the first notification described in the first embodiment.
  • the first notification is a notification transmitted on the (M / N) PDCCH using SC-RNTI and indicating whether or not the SC-MCCH has been changed.
  • the UE 100 can grasp the MBMS service (TMGI) related to the SC-MCCH change based on the first notification. it can.
  • TMGI MBMS service
  • the USD includes a provision start time (MBMS session start time) of each MBMS service.
  • the UE 100 grasps the provision start time of a specific MBMS service that it is interested in receiving.
  • the network may cease providing certain MBMS services using SC-PTM transmission.
  • the UE 100 in the RRC idle mode is interested in receiving a specific MBMS service.
  • the UE 100 recognizes that the specific MBMS service is not provided at the provision start time of the specific MBMS service.
  • the UE 100 has no knowledge of whether the network has stopped providing a specific MBMS service using SC-PTM transmission. Therefore, it is determined whether to wait until the provision of the MBMS service is started (that is, to maintain the RRC idle mode) or to try to receive the MBMS service by unicast (that is, to transit to the RRC connected mode). Difficult to do. From the viewpoint of the power consumption of UE 100 and the utilization efficiency of radio resources, it is desirable that UE 100 receives an MBMS service by SC-PTM while maintaining the RRC idle mode.
  • the second embodiment is an embodiment that attempts to solve such a problem.
  • the apparatus according to the second embodiment is included in a network that provides an MBMS service to the UE 100 using SC-PTM transmission (predetermined multicast / broadcast transmission scheme).
  • the device may be the eNB 200, the BM-SC 22, or the MME 300.
  • the control unit 230 of the eNB 200 determines a specific MBMS service that is not provided using SC-PTM transmission among a plurality of MBMS services that can be provided to the UE 100.
  • the control unit 230 of the eNB 200 notifies the UE 100 of identification information of the specific MBMS service.
  • the identification information may be TMGI.
  • the identification information may be a TMGI index.
  • the UE 100 receives an MBMS service provided from the network using SC-PTM transmission.
  • the control unit 130 of the UE 100 acquires service information (USD) related to a plurality of MBMS services provided from the network.
  • USD service information
  • the receiving unit 110 of the UE 100 receives identification information of a specific MBMS service that is not provided using SC-PTM transmission from the network. Based on the received identification information, the control unit 130 of the UE 100 determines that the specific MBMS service is not provided using SC-PTM transmission.
  • FIG. 16 is a diagram illustrating an operation example according to the second embodiment.
  • the UE 100 acquires service information (USD) from the EPC 20 (for example, BM-SC 22).
  • USD service information
  • the eNB 200 determines an MBMS service that is not provided using SC-PTM transmission.
  • MCE 11 rejects MBMS SESSION START.
  • the MCE 11 notifies the eNB 200 of identification information (for example, TMGI) of the MBMS service related to the rejection.
  • the eNB 200 determines an MBMS service that is not provided using SC-PTM transmission.
  • the eNB 200 broadcasts identification information of an MBMS service that is not provided using SC-PTM transmission.
  • eNB200 may include the said identification information in SIB (for example, SIB20).
  • SIB for example, SIB20.
  • the eNB 200 may broadcast a list including TMGIs of the plurality of MBMS services.
  • the eNB 200 may broadcast identification information at the original provision start time (MBMS session start time) of the specific MBMS service.
  • the eNB 200 may broadcast the identification information before and / or after the original provision start time of the specific MBMS service.
  • the eNB 200 may transmit the identification information a plurality of times over a certain period.
  • step S203 the UE 100 in the RRC idle mode recognizes an MBMS service that is not provided using SC-PTM transmission based on the identification information received from the eNB 200.
  • the UE 100 may transition to the RRC connected mode in order to receive the MBMS service by unicast. If the UE 100 determines that the MBMS service that it is interested in receiving is provided using SC-PTM transmission, even if the provision of the MBMS service is not started at the provision start time in the USD, the UE 100 The RRC idle mode may be maintained to wait until provisioning is started.
  • an apparatus other than the eNB 200 may notify the UE 100 of identification information of an MBMS service that is not provided using SC-PTM transmission.
  • the USD including the identification information (which may be a list) may be provided from the EPC 20 (for example, BM-SC 22) to the UE 100.
  • the UE 100 in the RRC idle mode may transition to the RRC connected mode when the service provision is not started at the provision start time of the specific MBMS service in which the UE 100 is interested in reception.
  • the start of service provision is only slightly delayed due to processing delay in the network, it is not preferable to immediately switch to the RRC connected mode.
  • the modified example of the second embodiment is an embodiment that attempts to solve such a problem.
  • the modified example of the second embodiment may be implemented separately from the second embodiment or may be used in combination with the second embodiment.
  • the UE 100 receives an MBMS service provided from the network using a predetermined multicast / broadcast transmission scheme.
  • the control unit 130 of the UE 100 acquires service information (USD) related to a plurality of MBMS services provided from the network.
  • the service information includes the provision start time of each MBMS service.
  • the control unit 130 of the UE 100 starts a timer in response to the provision of a specific MBMS service in which the UE 100 is interested in reception not being started at the provision start time.
  • the timer may be referred to as an allowable start delay timer.
  • the control unit 130 of the UE 100 waits for the start of provision of a specific MBMS service while the timer is operating.
  • control unit 130 of the UE 100 waits for the start of provision of a specific MBMS service in the RRC idle mode while the timer is operating. In response to the expiration of the timer, the control unit 130 of the UE 100 transitions from the RRC idle mode to the RRC connected mode in order to receive a specific MBMS service using unicast transmission.
  • the receiving unit 110 of the UE 100 may receive a timer value (allowable start delay time) to be set in the timer from the network.
  • the control unit 130 sets the timer value received from the network in the timer.
  • the timer value may be broadcast or multicast from the eNB 200.
  • the timer value may be included in SIB13, SIB15, SIB20, or SC-MCCH.
  • the timer value may be set individually for each MBMS service (TMGI), or may be a value common to all MBMS services.
  • TMGI MBMS service
  • the AS layer may acquire a timer value from the upper layer. In this case, the timer value may be included in the USD.
  • the timer value may be a predetermined fixed value.
  • FIG. 17 is a diagram illustrating an operation example according to a modification of the second embodiment.
  • the UE 100 obtains service information (USD) from the EPC 20 (for example, the BM-SC 22).
  • USD service information
  • the UE 100 may receive a timer value (allowable start delay time) to be set in the timer from the network.
  • step S251 the UE 100 in the RRC idle mode determines whether or not the provision start time of a specific MBMS service in which the UE 100 is interested in reception has come based on the USD.
  • step S252 the UE 100 determines whether or not provision of the specific MBMS service has been started.
  • step S253 the UE 100 receives the MBMS service provided using SC-PTM transmission in the RRC idle mode.
  • step S254 When provision of the specific MBMS service is not started at the provision start time (step S252: NO), in step S254, the UE 100 starts a timer and maintains the RRC idle mode to provide the specific MBMS service. Wait for it to start. If provision of the specific MBMS service is started during the operation of the timer (step S255: YES), the UE 100 stops the timer (step S256) and provides it using SC-PTM transmission in the RRC idle mode. The received MBMS service is received (step S253).
  • step S258 the UE 100 performs a random access procedure and transitions to the RRC connected mode. . And UE100 receives the said specific MBMS service by unicast in RRC connected mode.
  • a scenario is assumed in which the network temporarily interrupts the provision of the MBMS service using SC-PTM transmission.
  • the network is desired to be able to interrupt SC-PTM transmission in a period such as when congestion occurs or when the hardware is heavily loaded, and to resume SC-PTM transmission after the period has elapsed.
  • file integrity is required. Therefore, when packet loss occurs, the UE 100 in the RRC idle mode may need to change to the RRC connected mode and receive the file by unicast. Therefore, it is desirable to enable temporary interruption of SC-PTM transmission while suppressing the occurrence of packet loss.
  • the third embodiment is an embodiment for enabling temporary interruption of SC-PTM transmission.
  • the eNB 200 provides an MBMS service using SC-PTM transmission.
  • the control unit 230 of the eNB 200 determines to temporarily interrupt the provision of a specific MBMS service using SC-PTM transmission.
  • the transmission unit 210 of the eNB 200 transmits an interruption notification (Suspend indication) indicating that the provision of the MBMS service is temporarily suspended to the UE 100 before the provision of the specific MBMS service is suspended.
  • the interruption notification is transmitted by at least one of SC-MTCH transmission or control information (DCI) associated with SC-MCCH transmission, MAC CE transmitted by SC-MTCH, SC-MCCH, and SIB20.
  • DCI control information
  • the UE 100 receives the MBMS service provided from the eNB 200 using SC-PTM transmission.
  • the receiving unit 110 of the UE 100 receives an interruption notification indicating that provision of the specific MBMS service is temporarily interrupted from the eNB 200 while receiving the specific MBMS service using SC-PTM transmission.
  • the control unit 130 of the UE 100 interrupts reception of the MBMS service at the first timing in response to reception of the suspension notification.
  • the control unit 130 of the UE 100 resumes the reception of the MBMS service at the second timing after interrupting the reception of the SC-MTCH.
  • the receiving unit 110 of the UE 100 may receive timing information indicating the first timing and / or the second timing from the eNB 200.
  • FIG. 18 is a diagram illustrating an operation example of the UE 100 according to the third embodiment.
  • the UE 100 is in the RRC idle mode.
  • step S31 the UE 100 receives a specific MBMS service provided from the eNB 200 using SC-PTM transmission.
  • step S32 the UE 100 receives an interruption notification indicating that provision of the specific MBMS service is temporarily interrupted from the eNB 200.
  • the UE 100 interrupts reception of the specific MBMS service at the first timing.
  • the UE 100 is not required to receive (M / N) PDCCH) during a period in which provision of a specific MBMS service (specific SC-MTCH) is scheduled.
  • the UE 100 may be restricted from receiving the MBMS service by unicast while the service is suspended. For example, the UE 100 is not permitted to transition to the RRC connected mode for MBMS service reception during service interruption. Such a restriction may be effective only within the allowable delay time notified from the upper layer. That is, when the service interruption time exceeds the allowable delay time, it may be permitted to transition to the RRC connected mode for MBMS service reception.
  • the first timing may be the timing at which the interruption notification is received.
  • the first timing may be a timing at which the SC-MTCH including the interruption notification is transmitted.
  • the first timing may be determined based on a (M / N) PDCCH transmission subframe associated with SC-MTCH or a PDSCH transmission subframe corresponding to SC-MTCH.
  • the first timing may be determined based on the final transmission subframe of repetitive transmission.
  • the first timing may be the timing of the SC-MCCH modification boundary between the SC-MCCH change period at which the interruption notification is received and the next SC-MCCH change period. That is, the first timing is the timing of the first SC-MCCH change boundary after the timing when the interruption notification is received.
  • the first timing may be a relative timing determined on the basis of the time when the interruption notification is transmitted.
  • the first timing may be determined by the elapsed time (timer time) from the time when the interruption notification is transmitted.
  • the elapsed time may be a predetermined time or may be a time set by the eNB 200.
  • the first timing may be an absolute timing defined by time, subframe number, SFN, and H-SFN.
  • the said timing may be set from eNB200.
  • the first timing may be the first interruption candidate timing after the timing at which the interruption notification is received among the plurality of interruption candidate timings.
  • Such a suspension candidate timing may be referred to as “suspension boundary”.
  • the interruption candidate timing is defined using at least one of the following conditions.
  • the suspension candidate timing may be defined based on the SC-MCCH change boundary.
  • the suspension candidate timing may be obtained by equally dividing one SC-MCCH change period into a plurality of periods.
  • the reference point (start point) of the suspension candidate timing may be the same timing (subframe or the like) as the SC-MCCH change boundary.
  • the suspension candidate timing may be set for each MBMS service (TMGI).
  • the information related to the first timing as described above may be included in the interruption notification.
  • the eNB 200 may notify the UE 100 as an identifier based on the mapping table.
  • the mapping table may be a table preset in the UE 100.
  • the mapping table may be notified from the eNB 200 to the UE 100 using SC-MCCH or the like.
  • step S34 the UE 100 determines that the provision of the interrupted specific MBMS service is resumed.
  • the eNB 200 may continuously transmit a suspension notification while the provision of a specific MBMS service is suspended.
  • the UE 100 continuously receives the interruption notification while the provision of the specific MBMS service is interrupted.
  • the UE 100 may determine that the provision of the MBMS service is resumed when the interruption notification is not received.
  • the eNB 200 may transmit a restart notification indicating that the provision of the MBMS service is restarted to the UE 100.
  • the restart notification is transmitted by at least one of SC-MTCH transmission or control information (DCI) accompanying the SC-MCCH transmission, MAC CE transmitted by SC-MTCH, SC-MCCH, and SIB20.
  • DCI control information
  • the UE 100 determines that the provision of the MBMS service is resumed in response to receiving the resume notification.
  • step S35 the UE 100 resumes reception of a specific MBMS service at the second timing.
  • the second timing may be defined in the same way as the first timing.
  • the second timing may be the first resuming candidate timing after determining the resuming of SC-MTCH reception among the plurality of resuming candidate timings.
  • the restart candidate timing may be referred to as “Resumption boundary”.
  • the resume candidate timing is defined by the same method as the suspension candidate timing described above.
  • the resume candidate timing may be the same as the suspension candidate timing. In this case, the resume / suspend candidate timing may be referred to as “Suspension / resumption boundary”. Settings and notifications related to the resumption of MBMS service reception may be performed for each TMGI.
  • FIG. 19 is a diagram illustrating an operation sequence example 1 according to the third embodiment.
  • step S301 the UE 100 receives a specific MBMS service provided from the eNB 200 using SC-PTM transmission.
  • the eNB 200 transmits an interruption notification to the UE 100.
  • the eNB 200 may transmit a suspension notification when the MCE 11 is requested to suspend transmission of a specific MBMS service (specific SC-MTCH).
  • the eNB 200 may determine that service interruption is necessary to perform wireless congestion reduction or priority control of other unicast communication, and may transmit an interruption notification.
  • step S303 the UE 100 that has received the suspension notification suspends reception of the specific MBMS service at the first timing.
  • the eNB 200 periodically transmits an interruption notification.
  • the eNB 200 determines to resume provision of a specific MBMS service
  • the eNB 200 stops transmission of the interruption notification.
  • the UE 100 detects the suspension of transmission of the interruption notification and determines that the provision of the specific MBMS service is resumed.
  • step S305 the UE 100 resumes reception of a specific MBMS service at the second timing.
  • FIG. 20 is a diagram illustrating an operation sequence example 2 according to the third embodiment.
  • Steps S301 to S303 are the same as those in the operation sequence example 1. However, after transmitting the interruption notification in step S302, the eNB 200 may transmit the interruption notification again in consideration of the existence of the UE 100 that has not received the interruption notification.
  • step S311 the eNB 200 transmits a restart notification to the UE 100 when it is determined to restart providing a specific MBMS service.
  • the UE 100 detects the restart notification and determines that the provision of the specific MBMS service is restarted.
  • step S312 the UE 100 resumes reception of a specific MBMS service at the second timing.
  • an MBMS scenario using SC-PTM transmission is mainly assumed, but an MBMS scenario using MBSFN transmission may be assumed.
  • SC-PTM transmission may be read as MBSFN transmission
  • SC-MCCH may be read as MCCH
  • SC-MTCH may be read as MTCH.
  • the UE 100 may perform multicast reception in a connected state such as a connected mode, a light connected state, and an inactive mode. In this case, the UE 100 may perform multicast reception in the connected mode.
  • the UE 100 may determine whether to receive the MBMS service by multicast transmission or unicast transmission instead of determining whether to maintain the idle mode according to the modification of the second embodiment. .
  • firmware distribution is assumed as the MBMS service.
  • group message distribution, group chat message distribution, virus definition file distribution, periodic update file distribution such as weather forecast, irregular file distribution such as breaking news, night file distribution such as video content (off-peak distribution), MBMS services such as audio / video streaming distribution, telephone / video telephone (group communication), live video distribution, and radio audio distribution may be assumed.
  • a program for causing a computer to execute each process performed by the UE 100 and the eNB 200 may be provided.
  • the program may be recorded on a computer readable medium. If a computer-readable medium is used, a program can be installed in the computer.
  • the computer-readable medium on which the program is recorded may be a non-transitory recording medium.
  • the non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.
  • a chip set including a memory that stores a program for executing each process performed by the UE 100 and the eNB 200 and a processor that executes the program stored in the memory may be provided.
  • the LTE system is exemplified as the mobile communication system.
  • the present disclosure is not limited to LTE systems.
  • the present disclosure may be applied to mobile communication systems other than the LTE system.
  • the 96th RAN2 concludes about direct indication of SC-MCCH change notification to use one bit in DCI scrambled with SC-RNTI for SC-MCCH change notification, and G-RNTI as follows: Agreed to introduce a pair of one-bit indicators in the DCI scrambled with: SC-MCCH change notification (for UEs interested in starting a new session): -For eNB-IoT and feMTC: One bit in DCI is used in PDCCH for SC-MCCH scheduling and SC-RNTI is used.
  • SC-MCCH change notification (for UEs in service): -For eNB-IoT and feMTC: Use one bit in DCI in PDCCH for SC-MTCH scheduling to indicate whether the configuration of SC-MTCH is changed in the next MP.
  • -For eNB-IoT and feMTC Use one additional bit in DCI in PDCCH for SC-MTCH scheduling to indicate whether a new service is scheduled to start in the next MP . For UEs that are in service and interested in starting other new sessions.
  • -RAN2 asks RAN1 whether to accept 2 bits. If only 1 bit is accepted, RAN2 uses 1 bit.
  • the first direct indication in the PDCCH scrambled with SC-RNTI has the same function as the existing SC-MCCH change notification currently indicated in the PDCCH scrambled with SC-N-RNTI.
  • This direct indication is mainly expected to be provided before a new MBMS session starts (ie, the UE stops receiving SC-PTM), according to the agreed future procedure.
  • the eNB gives this direct indication whenever the SC-MCCH is changed at the next SC-MCCH change boundary, ie whether or not it already provides an MBMS session, as illustrated in FIG. It may be assumed to transmit at any time.
  • the current specification specifies that the UE initiates SC-MCCH acquisition within the same subframe in which the SC-MCCH change notification is received, but the SC-MCCH change is the SC-MCCH change boundary. Just happens.
  • the network When the network changes (part of) the SC-MCCH information, the network notifies the UE about the change in the first sub-frame that may be used for SC-MCCH transmission within the repetition period.
  • the least significant bit in the 8-bit bitmap indicates the change of SC-MCCH when '1' is set.
  • the UE interested in receiving the MBMS service transmitted using SC-PTM obtains new SC-MCCH information starting from the same subframe. The UE applies the previously acquired SC-MCCH information until the UE acquires new SC-MCCH information.
  • This UE behavior related to SC-MCCH change notification is one of the MCCH acquisitions for MBSFN, and for the SC-PTM discussed in the following section, ie with respect to the same or the next change boundary. It differs from the recently agreed additional set of direct instructions.
  • Confirmation 1 The eNB notifies a new MBMS session whenever the first MS-CHCH change period has changed from this SC-MCCH change period by the first direct indication in the PDCCH containing the SC-RNTI .
  • the first direct indication will notify the SC-MCCH change in this change period rather than the next change period, so there is no “notification” with a broken line in FIG. Let's go. If the UE receives the first direct notification in the PDCCH scrambled with SC-RNTI, the UE needs to start decoding SC-MCCH immediately on the PDSCH.
  • the second direct indication in the PDCCH scrambled with G-RNTI is intended for UEs receiving an ongoing MBMS session as depicted in FIG. 22, according to the agreed future procedure. It is considered a kind of “SC-MCCH change notification specific to TMGI (of this G-RNTI)”. Since there is SC-MTCH transmission only in the ongoing MBMS session, it may be assumed that the eNB sends this direct indication only in the ongoing MBMS session. In other words, the eNB does not need to send an instruction directly for an MBMS session that has not yet started.
  • Confirmation 2 The second direct indication in the PDCCH for this TMGI is not used to notify the SC-MCCH change for a new MBMS session.
  • the third direct indication in the PDCCH scrambled with G-RNTI may be assumed to be either SC-MCCH change notification (of other G-RNTI) or some kind of SC-MTCH start notification. Although this is somewhat unclear from the agreement, the currently executing CR assumes that this direct indication is one of the SC-MCCH change notifications. This direct indication is intended for UEs that are receiving an ongoing MBMS session as shown in FIG. 23 according to the agreed future procedure, but are interested in other new MBMS sessions. RAN2 should clarify the meaning of the third direct indication first.
  • Proposal 1 RAN2 clarifies whether the third direct indication in the PDCCH for the start of another new MBMS session is a kind of SC-MCCH change notification or SC-MTCH start notification Should.
  • the third direct indication works well when only one new MBMS session starts simultaneously, but it is unclear what happens when two or more new MBMS sessions are about to start. .
  • the third direct indication which contains only one bit, allows two new sessions from the UE perspective, even though one of the two sessions has not actually started at the next SC-MCCH change boundary. It may be assumed that they cannot be distinguished.
  • Observation 1 Using one bit in the PDCCH scrambled with G-RNTI, if more than one MBMS session is about to start, the UE will decide which of the new MBMS sessions is the next SC-MCCH change boundary Cannot distinguish between starting with.
  • the UE when the UE is interested in only one of the new MBMS sessions and a third direct indication for other MBMS services is received before the start of the MBMS session according to USD, The UE will check the SC-MCCH and the UE will be interested in the SC-MCCH (since the third direct indication was directed to another MBMS service that is not of interest to the UE as illustrated in FIG. 24). Since there is no configuration change for a certain MBMS session, return to the ongoing SC-MTCH reception.
  • the SC-MCCH check may interrupt the SC-MTCH reception for the eNB-IoT UE in particular, and the interruption of the SC-MTCH reception is a motivation to introduce a direct indication, ie “service Is inconsistent with the motivation to solve the problem that SC-MTCH that is continuing will be interrupted by SC-MCCH reception for each MP.
  • RAN2 informs TMGI about a problem, eg, a limited number of new MBMS session starts (ie, only one at a time) or start when the eNB wants to start two or more of the new MBMS sessions You should consider how to solve some enhancements.
  • Proposal 2 When RAN2 is interested in only one of several new MBMS services that the UE will be started in the next SC-MCCH change period, the interruption of SC-MTCH reception is SC-MCCH It should be considered how this can be solved by monitoring.
  • the UE may predict when an MBMS service of interest is about to start (according to the “start” information in the USD), but the NW is responsible for the RAN by the SC-PTM.
  • One may decide not to provide an MBMS service, i.e. none of the three direct indications are provided. In this case, the UE needs to receive the MBMS service by unicast.
  • the UE may learn from SIB 15 with a frequency that provides the MBMS service of interest by SC-PTM and SC-MCCH with a cell that provides the SC-PTM of interest. In other words, the UE may notify that the NW does not currently provide the SC-PTM of interest when neither the SIB 15 nor the SC-MCCH includes the corresponding TMGI.
  • the expected UE behavior that the UE should stay in a waiting state and wait for SC-PTM to start is May be obvious.
  • UE may transition to connected state to acquire MBMS service by unicast, but how long should UE stay in a wait state before establishing connection to receive MBMS service of interest by unicast It is unclear whether it is.
  • Proposal 3 RAN2 should consider when a UE is allowed to acquire this MBMS service of interest by unicast if the NW does not provide SC-PTM for MBMS service .
  • -Alternative 2 Based on additional RAN support information, eg, a broadcast list of MBMS services that are not provided by SC-PTM.
  • Alternative 1 is the simplest, even assuming that the UE performs repeated checks of the SC-PTM service up to a delay threshold determined by higher layers, even if the UE power for receiving the MBMS service by SC-PTM Functions normally when consumption is assumed to be less than unicast power consumption. However, this may cause unnecessary receive latency, eg firmware download, even though the service is considered to be delay tolerant.
  • Alternative 2 is a controllable mechanism from the NW point of view and balances performance between reception delay and NW congestion due to multiple connection requests at the end of acceptable MBMS service latency . Further, as seen in Alternative 1 above, if the UE eventually needs to use unicast, it minimizes the UE power consumption due to unnecessary wake-up for SC-PTM check. Will be suppressed. The reason why Alternative 2 only includes MBMS services that are not provided by SC-PTM is that this should rather be an exception when these scheduled services are not provided by SC-PTM Thus, the NW does not need to broadcast this information when it is not needed. However, Alternative 2 requires further standardization activities and it is unclear how the RAN knows when the MBMS service starts (eg in USD).
  • Alternative 2 is intended to avoid UE power consumption and NW congestion, taking into account battery-sensitive applications and high volume devices (ie, mMTC) preferable.
  • Proposal 4 The NW should notify the UE of a list of scheduled MBMS services that will not be provided by SC-PTM by broadcast.
  • SC-PTM transmission for an ongoing MBMS session may be temporarily stopped due to congestion, especially if the session lasts for a long duration.
  • the UE does not change or be removed at least until the next SC-MCCH change boundary, ie the corresponding configuration in the SC-MCCH is changed before the next change boundary.
  • -It is necessary to continue to monitor MTCH. In other words, the UE's battery will still be consumed when the ongoing SC-PTM of interest is stopped. In order to avoid unnecessary power consumption, the UE should be notified when the MBMS session is stopped by the NW.
  • the “S” field used in part of the MBMS service stop and restart functions is “whether the MTCH transmission should be stopped by the eNode B” and “eNB when the stopped MBMS service is restarted. Informs the UE that it should naturally allow transmission from the beginning of the change period indicated by the MCCH update time, where the MCCH update time is equal to the MCCH change period.
  • the current “S” field tells the UE that the ongoing service will be stopped in the near future which is sufficient for the streaming service envisaged for MBSFN.
  • the delivery service envisaged in Release 14 may cause unicast file recovery even if one FLUTE block is missed, so closer synchronization between the eNB and the UE with respect to stop and resume Request. Therefore, the eNB notifies the UE of the exact timing of the stop determined by using, for example, SFN in the DCI or MAC CE, H-SFN, this SC-MTCH transmission, the next SC-MCCH change boundary, etc. There is a need.
  • the NW may decide to stop quite quickly as it may be too late to wait for the next SC-MCCH change period depending on the configuration.
  • Proposal 5 RAN2 should agree that the UE should be notified when SC-PTM transmission for an ongoing MBMS session is stopped.
  • Proposal 5 the expected UE behavior during the outage is to wait for SC-PTM to resume, ie the UE remains in a waiting state as discussed in view 4 of the previous section. Is self-explanatory. This prevents multiple RRC connection requests for MBMS service reception by unicast when the NW stops SC-PTM transmission. The situation will get worse if the outage is done under NW congestion. Therefore, the stopping UE behavior should be specified. However, this behavior should take into account delay requirements at higher layers.
  • Proposal 6 If SC-MTCH stoppage can be agreed, RAN2 will allow the UE to acquire the MBMS of interest by unicast as long as the service delay requirement is satisfied while SC-PTM is stopped It should also be agreed that it is not allowed.
  • this stop for SC-MTCH is continuously indicated using one additional bit in DCI or using an additional configuration in SC-MCCH.
  • SC-PTM ie Proposition 4
  • the UE may decide at any time to wait for SC-PTM to resume if SC-PTM has just been stopped (ie, has not been stopped).
  • Proposal 7 If the SC-MTCH stop can be agreed, RAN2 may prevent the UE from initiating an RRC connection request to acquire the MBMS of interest by unicast, eg, in DCI or SC-MCCH It should be further agreed that the stop indication is broadcast continuously during the stop period.
  • SC-MTCH suspension When SC-MTCH suspension is introduced, it is necessary to restart this SC-MTCH as well.
  • MBSFN transmission was restarted from time to time based on MCCH change boundaries, and the change periods were rf512 and rf1024.
  • the UE may check whether the SC-MTCH is still stopped or restarted only by monitoring the first MBSFN subframe after the MCCH change notification or MCCH change boundary.
  • the SC-PTM of Release 14 has agreed as a baseline to extend the SC-MCCH change period up to the maximum eDRX cycle, ie 2.91 hours. If the NW congestion is alleviated and the NW wants to resume SC-PTM transmission immediately, the resumption will continue until after the next change boundary and if the congestion is mitigated towards the beginning of the current SC-MCCH change period , Possibly not up to approximately 2.91 hours later.
  • SC-MTCH resumption may be delayed up to 2.91 hours if resumption of SC-PTM transmission can only occur occasionally after the next SC-MCCH change boundary.
  • the eNB may indicate whether SC-PTM is still stopped or restarted regardless of the SC-MCCH change period.
  • the restart boundary is assumed to be indicated by the eNB using, for example, SC-MCCH (including hard-coded mapping table), MAC CE or DCI.
  • SC-MCCH including hard-coded mapping table
  • MAC CE MAC CE
  • DCI DCI
  • Proposal 8 Can RAN2 be able to resume a stopped SC-PTM only (implicitly) after the next SC-MCCH change boundary, or (explicitly) at the restart boundary indicated by the eNB You should consider whether.
  • FIG. 25 An example timeline for the MBMS file delivery service is described in FIG. 25 and uses only the SC-MCCH change notification (ie, the first direct indication) using SC-RNTI for clarity only.
  • the figure further integrates the start / stop information described in the USD and RAN level stop instructions agreed at the last meeting.
  • the figure tentatively captures the SC-MTCH stop / resume mechanism discussed in Section 2.3.
  • the SC-MCCH transmission starts from the same SC-MCCH change boundary provided with the SC-MCCH change notification according to the current specification (see green arrow). Subsequently, SC-MTCH transmission is started after the next change boundary (see blue arrow), and SC-MTCH is unpredictable when all UEs complete acquisition of the changed SC-MCCH. It is possible and provides the most robust transmission timeline because it is not preferred that some UEs cannot receive some packets during a file delivery session (ie when not a streaming session).
  • the SC-MCCH change period is configured using an extended value, for example, 2.91 hours
  • the SC-MCCH transmission is significantly more compared to the MBMS session start time (as defined in USD). May be delayed. This delay may be unavoidable if the implementation is allowed by the implementation to send an SC-MCCH change notification one change period ahead.
  • Proposal 9 After the SC-MCCH change is instructed, RAN2 should clarify whether the SC-MTCH transmission is started at the next SC-MCCH change boundary.
  • This disclosure is useful in the mobile communication field.

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  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un terminal radioélectrique qui utilise une transmission SC-PTM pour recevoir un service MBMS fourni par la station de base. Le terminal radioélectrique comprend : une unité de réception qui, pendant la réception d'un service MBMS spécifique en utilisant la transmission SC-PTM susmentionnée, reçoit de la part de la station de base une notification d'interruption indiquant que la fourniture du service MBMS spécifique doit être interrompue ; et une unité de commande qui, en réponse à la réception de la notification d'interruption, interrompt la réception du service MBMS spécifique.
PCT/JP2018/003137 2017-02-03 2018-01-31 Terminal radioélectrique et station de base WO2018143246A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007511940A (ja) * 2004-02-11 2007-05-10 エルジー エレクトロニクス インコーポレイティド 移動通信システムにおけるｍｂｍｓデータの不連続送受信方法
WO2009131087A1 (fr) * 2008-04-22 2009-10-29 シャープ株式会社 Procédé et dispositif de communication
US20130215761A1 (en) * 2011-03-21 2013-08-22 Zte Corporation Method and Device for Determining Resumption of Suspended Multimedia Broadcast Multicast Service, and User Equipment
WO2016070764A1 (fr) * 2014-11-06 2016-05-12 Qualcomm Incorporated Notification de suspension/arrêt de session embms
WO2016119640A1 (fr) * 2015-01-30 2016-08-04 Qualcomm Incorporated Support de mode d'émission et impact sur les décodages aveugles pdcch de l'émission ptm (point à multipoint)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007511940A (ja) * 2004-02-11 2007-05-10 エルジー エレクトロニクス インコーポレイティド 移動通信システムにおけるｍｂｍｓデータの不連続送受信方法
WO2009131087A1 (fr) * 2008-04-22 2009-10-29 シャープ株式会社 Procédé et dispositif de communication
US20130215761A1 (en) * 2011-03-21 2013-08-22 Zte Corporation Method and Device for Determining Resumption of Suspended Multimedia Broadcast Multicast Service, and User Equipment
WO2016070764A1 (fr) * 2014-11-06 2016-05-12 Qualcomm Incorporated Notification de suspension/arrêt de session embms
WO2016119640A1 (fr) * 2015-01-30 2016-08-04 Qualcomm Incorporated Support de mode d'émission et impact sur les décodages aveugles pdcch de l'émission ptm (point à multipoint)

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