WO2022082340A1 - Procédés et appareil permettant de fournir des services de multidiffusion fiables par l'intermédiaire d'une mrb - Google Patents

Procédés et appareil permettant de fournir des services de multidiffusion fiables par l'intermédiaire d'une mrb Download PDF

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Publication number
WO2022082340A1
WO2022082340A1 PCT/CN2020/121791 CN2020121791W WO2022082340A1 WO 2022082340 A1 WO2022082340 A1 WO 2022082340A1 CN 2020121791 W CN2020121791 W CN 2020121791W WO 2022082340 A1 WO2022082340 A1 WO 2022082340A1
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Prior art keywords
mrb
entity
rlc
pdcp
mtch
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PCT/CN2020/121791
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English (en)
Inventor
Yuanyuan Zhang
Xuelong Wang
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Mediatek Singapore Pte. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2020/121791 priority Critical patent/WO2022082340A1/fr
Priority to CN202111177971.XA priority patent/CN114390447B/zh
Priority to TW110138494A priority patent/TWI792614B/zh
Priority to US17/504,893 priority patent/US20220124463A1/en
Publication of WO2022082340A1 publication Critical patent/WO2022082340A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, the method to support reliable multicast service delivery via MRB from the wireless network to the UEs.
  • Various cellular systems may provide a multicast functionality, which allows user equipments (UEs) in the system to receive multicast services transported by the cellular system.
  • UEs user equipments
  • a variety of applications may rely on communication over multicast transmission, such as live stream, video distribution, vehicle-to-everything (V2X) communication, public safety (PS) communication, file download, and so on.
  • V2X vehicle-to-everything
  • PS public safety
  • file download file download
  • RB radio bearer
  • apparatus and mechanisms are sought to establish, (re) configure and release the particular RB in order to support the reliable delivery for the multicast services, especially when UE moves among difference cell to guarantee the service continuity.
  • the apparatus may be a UE.
  • the UE applies the MRB establishment procedure to start receiving a session of a multicast service.
  • UE establish/add a MRB when one or more of the establishment conditions is met.
  • the UE applies the MRB reconfiguration procedure to switch the transmission mode (i.e. PTM, PTP or PTM+PTP) for the on-going session of a multicast service.
  • UE reconfigure/modify a MRB when one or more of the reconfiguration conditions is met.
  • the UE applies the MRB release procedure to stop receiving a session.
  • UE release/remove the MRB when one or more of the release conditions is met.
  • UE In MRB establishment procedure, for PDCP-based retransmission to enhance the reliability, UE establishes a PDCP entity for the MRB. UE establishes one or two RLC entities and configures two logical channel MTCH and DTCH for the MRB. UE configures the MAC entity to map MTCH to MCH and map DTCH to DL-SCH. For RLC-based retransmission for reliability enhancement, UE establishes a PDCP entity and a particular RLC entity for the MRB. The RLC entity is associated to one or two logical channels. For MAC-based retransmission for reliability enhancement, UE establishes a PDCP entity and a RLC entity for the MRB. UE configures the MAC entity to map MTCH to MCH and map DTCH to DL-SCH.
  • UE In MRB reconfiguration procedure, for PDCP-based retransmission to enhance the reliability, UE reconfigures the PDCP entity for MRB and performs RLC bearer addition/modification. For RLC-based retransmission for reliability enhancement, UE reconfigures the PDCP entity for MRB and performs RLC bearer reconfiguration. For MAC-based retransmission, UE reconfigures the PDCP entity for MRB and performs RLC bearer addition/modification. UE configures MAC entity for the logical channel.
  • UE In MRB release procedure, for PDCP-based retransmission to enhance the reliability, UE release the PDCP entity for MRB and release the one or two RLC entities. For RLC-based retransmission, UE release the PDCP entity for MRB and release the RLC entity and logical channels. For MAC-based retransmission, UE release the PDCP entity for MRB and release the RLC entity. UE release the MAC configuration for the MRB.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • Figure 1 illustrates a schematic system diagram illustrating an exemplary wireless network in accordance with embodiments of the current invention.
  • Figure 2 illustrates an exemplary NR wireless system with centralization of the upper layers of the NR radio stacks in accordance with embodiments of the current invention.
  • FIG. 3 illustrates an exemplary Multicast radio bearer (MRB) in accordance with embodiments of the current invention.
  • MRB Multicast radio bearer
  • Figure 4 illustrates an exemplary protocol stack for a MRB with PDCP-based retransmission in accordance with embodiments of the current invention.
  • Figure 5 illustrates an exemplary protocol stack for a MRB with RLC-based retransmission in accordance with embodiments of the current invention.
  • Figure 6 illustrates an exemplary protocol stack for a MRB with MAC-based retransmission in accordance with embodiments of the current invention.
  • Figure 7 illustrates exemplary configurations for a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • Figure 8 illustrates an exemplary flowchart to control the MRB in accordance with embodiments of the current invention.
  • Figure 9 illustrates the exemplary flowcharts to establish/add a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • Figure 10 illustrates the exemplary flowcharts to reconfigure/modify a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • Figure 11 illustrates the exemplary flowcharts to release/remove a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • Figure 12 illustrates an exemplary flowchart to perform MRB reconfiguration during RRC state transmission from IDLE/INACTIVE to CONNECTED in accordance with embodiments of the current invention.
  • NR new radio access technology, or 5G technology
  • NR may support various wireless communication services. These services may have different quality of service (QoS) requirements e.g. latency and reliability requirements.
  • QoS quality of service
  • FIG. 1 illustrates a schematic system diagram illustrating an exemplary wireless network in accordance with embodiments of the current invention.
  • Wireless system includes one or more fixed base infrastructure units forming a network distributed over a geographical region.
  • the base unit may also be referred to as an access point, an access terminal, a base station, a Node-B, an eNode-B, a gNB, or by other terminology used in the art.
  • base stations serve a number of mobile stations within a serving area, for example, a cell, or within a cell sector.
  • one or more base stations are coupled to a controller forming an access network that is coupled to one or more core networks.
  • gNB 1and gNB 2 are base stations in NR, the serving area of which may or may not overlap with each other.
  • UE1 or mobile station is only in the service area of gNB 1 and connected with gNB1.
  • UE1 is connected with gNB1 only, gNB1 is connected with gNB 102 via Xn interface.
  • UE2 is in the overlapping service area of gNB1 and gNB2.
  • both gNB1 and gNB2 provide the same MBMS services, service continuity during handover is guaranteed when UE 2 moves from gNB1 to gNB2 and vice versa.
  • Figure 1 further illustrates simplified block diagrams for UE2 and gNB2, respectively.
  • UE has an antenna, which transmits and receives radio signals.
  • a RF transceiver coupled with the antenna, receives RF signals from antenna, converts them to baseband signal, and sends them to processor.
  • the RF transceiver may comprise two RF modules (not shown) .
  • a first RF module is used for transmitting and receiving on one frequency band, and the other RF module is used for different frequency bands transmitting and receiving which is different from the first transmitting and receiving.
  • RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna.
  • Processor processes the received baseband signals and invokes different functional modules to perform features in UE.
  • Memory stores program instructions and data to control the operations of mobile station.
  • UE also includes multiple function modules that carry out different tasks in accordance with embodiments of the current invention.
  • a RRC State controller which controls UE RRC state according to network’s command and UE conditions.
  • RRC supports the following states, RRC_IDLE, RRC_CONNECTED and RRC_INACTIVE.
  • UE can receive the broadcast services in RRC_IDLE/INACTIVE state.
  • the UE applies the MRB establishment procedure to start receiving a session of a service it has an interest in.
  • the UE applies the MRB release procedure to stop receiving a session.
  • a MRB controller which controls to establish/add, reconfigure/modify and release/remove a MRB based on different sets of conditions for MRB establishment, reconfiguration and release.
  • a protocol stack controller which manage to add, modify or remove the protocol stack for the MRB.
  • the protocol Stack includes RLC, MAC and PHY layers.
  • the SDAP layer is optionally configured.
  • the PDCP layer supports the functions of transfer of data, maintenance of PDCP SN, header compression and decompression using the ROHC protocol, ciphering and deciphering, integrity protection and integrity verification, timer based SDU discard, routing for split bearer, duplication, re-ordering and in-order delivery; out of order delivery and duplication discarding.
  • the RLC layer supports the functions of error correction through ARQ, segmentation and reassembly, re-segmentation, duplication detection, re-establishment, etc.
  • a new procedure for RLC reconfiguration is performed, which can reconfigure the RLC entity to associated to one or two logical channels.
  • the MAC layer supports the following functions: mapping between logical channels and transport channels, multiplexing/demultiplexing, HARQ, radio resource selection, etc.
  • gNB2 has an antenna, which transmits and receives radio signals.
  • a RF transceiver coupled with the antenna, receives RF signals from antenna, converts them to baseband signals, and sends them to processor.
  • RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna.
  • Processor processes the received baseband signals and invokes different functional modules to perform features in gNB2.
  • Memory stores program instructions and data to control the operations of gNB2.
  • gNB2 also includes multiple function modules that carry out different tasks in accordance with embodiments of the current invention.
  • a RRC State controller which performs access control for the UE.
  • a MRB controller which controls to establish/add, reconfigure/modify and release/remove a MRB based on different sets of conditions for MRB establishment, reconfiguration and release.
  • a protocol stack controller which manage to add, modify or remove the protocol stack for the MRB.
  • the protocol Stack includes RLC, MAC and PHY layers.
  • the SDAP layer is optionally configured.
  • Figure 2 illustrates an exemplary NR wireless system with centralization of the upper layers of the NR radio stacks in accordance with embodiments of the current invention.
  • Different protocol split options between Central Unit and lower layers of gNB nodes may be possible.
  • the functional split between the Central Unit and lower layers of gNB nodes may depend on the transport layer.
  • Low performance transport between the Central Unit and lower layers of gNB nodes can enable the higher protocol layers of the NR radio stacks to be supported in the Central Unit, since the higher protocol layers have lower performance requirements on the transport layer in terms of bandwidth, delay, synchronization and jitter.
  • SDAP and PDCP layer are located in the central unit, while RLC, MAC and PHY layers are located in the distributed unit.
  • FIG. 3 illustrates an exemplary Multicast radio bearer (MRB) in accordance with embodiments of the current invention.
  • Multicast radio bearer provides multicast services, which is carried by MTCH, DTCH or both of MTCH and DTCH.
  • the MRB is configured to be associated to a MTCH.
  • the MRB is configured to be associated to a DTCH.
  • the MRB is configured to be associated to a MTCH and a DTCH.
  • the MRB is configured in PTM&PTP transmission mode.
  • MRB multicast Radio Bearers
  • the multicast Radio Bearer i.e. RB
  • the multicast Radio Bearer can be subject to Point-to-Multiple Point (i.e. PTM) , Point-to-Point (i.e. PTP) transmission or combination of PTM and PTP transmission within a cell.
  • PTM Point-to-Multiple Point
  • PTP Point-to-Point
  • the MRB is configured in PTP transmission mode.
  • the MRB is configured in PTM mode.
  • the MRB is configured in PTM&PTP transmission mode.
  • NR multicast/broadcast is transmitted in the coverage of a cell.
  • MCCH provides the information of a list of NR multicast/broadcast services with ongoing sessions transmitted on MTCH (s) .
  • MTCH is scheduled by gNB in the search space of PDCCH with G-RNTI scrambled.
  • UE decodes the MTCH data for a multicast session in the multicast PDSCH.
  • the radio bearer structure for multicast and broadcast transmission is modelled in an independent way from unicast transmission. Because of the unidirectional transmission for legacy MBMS/eMBMS service, RLC UM node is used for the transmission of multicast/broadcast session. In this case there is no need to make the interaction between multicast and unicast for a particular UE which is in RRC Connected state.
  • a feedback channel in the uplink is needed for each UE receiving the service, which can be used by the receiving UE to feedback its reception status about the service to the network. Based on the feedback, the network may perform necessary retransmission to improve the transmission reliability.
  • the feedback channel may be used for L2 feedback (e.g. RLC Status Report and/or PDCP Status Report) .
  • the feedback channel may be used for HARQ feedback.
  • the feedback should be a bidirectional channel between the UE and the network, with the assumption that the network may take that channel to perform needed packet retransmission.
  • the said packet retransmission is L2 retransmission (e.g. RLC retransmission and/or PDCP retransmission) .
  • the feedback channel may be used for HARQ retransmission.
  • FIG. 4 illustrates an exemplary protocol stack for a MRB with PDCP-based retransmission in accordance with embodiments of the current invention.
  • Two logical channels, i.e. MTCH and DTCH are associated to the PDCP entity.
  • Each logical channel is corresponding to a RLC entity.
  • the PDCP status report to trigger PDCP retransmission is delivered to the RLC entity corresponding to DTCH.
  • the PDCP PDUs subject to retransmission is delivered through DTCH.
  • the MAC entity maps the logical channel MTCH to the transport channel MCH and maps the logical channel DTCH to the transport channel DL-SCH.
  • UE monitors two independent transport channels via different RNTIs.
  • the ROHC function and security function is optional for multicast transmission.
  • the RLC layer includes only segmentation and the ARQ function of RLC layer is moved to PDCP layer.
  • FIG. 5 illustrates an exemplary protocol stack for a MRB with RLC-based retransmission in accordance with embodiments of the current invention.
  • Each RLC entity is associated to two logical channels, i.e. MTCH and DTCH.
  • the RLC status report to trigger RLC retransmission is delivered through DTCH.
  • the RLC PDUs subject to retransmission is delivered through DTCH.
  • the MAC entity maps the logical channel MTCH to the transport channel MCH and maps the logical channel DTCH to the transport channel DL-SCH.
  • UE monitors two independent transport channels via different RNTIs.
  • Figure 6 illustrates an exemplary protocol stack for a MRB with MAC-based retransmission in accordance with embodiments of the current invention.
  • Each RLC entity is associated to one logical channel, i.e. MTCH.
  • the MAC entity maps the logical channel MTCH to MCH and DL-SCH.
  • MCH is used for initial transmission and optionally retransmission.
  • DL-SCH is used for retransmission of the TBs.
  • the HARQ feedback to trigger HARQ retransmission is delivered through UL-SCH.
  • the TBs subject to retransmission is delivered through DL-SCH.
  • UE monitors two independent transport channels via different RNTIs.
  • Figure 7 illustrates exemplary configurations for a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • the MRB is configured with one RLC entity, associated to MTCH; in one embodiment, the MRB is configured with one RLC entity, associated to DTCH; in one embodiment, the MRB is configured with two RLC entities, associated to MTCH and DTCH respectively.
  • the RLC entity of the MRB is associated to MTCH; in one embodiment, the RLC entity of the MRB is associated to DTCH; in one embodiment, the RLC entity of the MRB is associated to two logical channels, i.e.
  • the MAC entity maps MTCH to MCH; in one embodiment, the MAC entity maps MTCH to DL-SCH; in one embodiment, the MAC entity maps MTCH to both MCH and DL-SCH.
  • FIG. 8 illustrates an exemplary flowchart to control the MRB in accordance with embodiments of the current invention.
  • the UE applies the MRB establishment procedure to start receiving a session of a multicast service.
  • UE establish/add a MRB when one of the establishment conditions is met.
  • the establishment conditions contain at least the following events:
  • the UE applies the MRB reconfiguration procedure to switch the transmission mode (i.e. PTM, PTP or PTM+PTP) for the on-going session of a multicast service.
  • UE reconfigure/modify a MRB when one of the reconfiguration conditions is met.
  • the reconfiguration conditions contain at least the following events:
  • the UE applies the MRB release procedure to stop receiving a session.
  • UE release/remove the MRB when one of the release conditions is met.
  • the release conditions contain at least the following events:
  • Figure 9 illustrates the exemplary flowcharts to establish/add a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • UE establishes a PDCP entity for the MRB.
  • UE establishes an RLC entity and configures an MTCH logical channel for the MRB; in one embodiment, UE establishes an RLC entity and configures a DTCH logical channel for the MRB; in one embodiment, UE establishes two RLC entities and configures two logical channel MTCH and DTCH for the MRB.
  • UE configures the MAC entity to map MTCH to MCH and map DTCH to DL-SCH.
  • UE For RLC-based retransmission for reliability enhancement, UE establishes a PDCP entity and a particular RLC entity for the MRB. In one embodiment, UE establishes an RLC entity and configures an MTCH logical channel for the MRB; in one embodiment, UE establishes an RLC entity and configures a DTCH logical channel for the MRB; in one embodiment, UE establishes an RLC entity and configures two logical channel MTCH and DTCH for the MRB. UE configures the MAC entity to map MTCH to MCH and map DTCH to DL-SCH.
  • UE For MAC-based retransmission for reliability enhancement, UE establishes a PDCP entity and a RLC entity for the MRB. UE configures the MAC entity to map MTCH to both MCH and DL-SCH.
  • Figure 10 illustrates the exemplary flowcharts to reconfigure/modify a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • UE reconfigures the PDCP entity for MRB according to the configuration, e.g. pdcp-config.
  • UE performs RLC bearer addition/modification based on the configuration, e.g. RLC-BearerConfig.
  • the PDCP entity is reconfigured as one of the following three options: one RLC entity for MTCH, one RLC entity for DTCH and two RLC entities for MTCH and DTCH respectively for the MRB.
  • UE associates the logical channel with the PDCP entity identified by servedRadioBearer if a logical channel with the given logicalChannelIdentity is not configured before.
  • UE configures MAC entity for the logical channel according to the configuration, e.g. mac-LogicalChannelConfig.
  • UE For RLC-based retransmission for reliability enhancement, UE reconfigures the PDCP entity for MRB according to the configuration, e.g. pdcp-config. UE performs RLC bearer reconfiguration based on the configuration, e.g. RLC-BearerConfig. As a result, the RLC entity is associated to one or two logical channels, i.e. MTCH, DTCH or both DTCH and MTCH. For RLC reconfiguration, the change between the association to MTCH, DTCH and both MTCH and DTCH is performed. UE configures MAC entity for the logical channel according to the configuration, e.g. mac-LogicalChannelConfig.
  • UE For MAC-based retransmission for reliability enhancement, UE reconfigures the PDCP entity for MRB according to the configuration, e.g. pdcp-config. UE performs RLC bearer addition/modification based on the configuration, e.g. RLC-BearerConfig. UE configures MAC entity for the logical channel according to the configuration, e.g. mac-LogicalChannelConfig. As a result, the MAC entity is associated to one or two transport channels, i.e. MCH, DL-SCH or both MCH and DL-SCH.
  • MCH transport channels
  • Figure 11 illustrates the exemplary flowcharts to release/remove a MRB for different retransmission schemes in accordance with embodiments of the current invention.
  • UE For PDCP-based retransmission for reliability enhancement, UE release a PDCP entity for the MRB. UE release one or two RLC entities and the associated logical channels. UE release the MAC configuration for the MRB.
  • UE For RLC-based retransmission for reliability enhancement, UE release a PDCP entity for the MRB. UE release the RLC entity and the associated one or two logical channels. UE release the MAC configuration for the MRB.
  • MAC-based retransmission for reliability enhancement UE release a PDCP entity for the MRB. UE release the RLC entity and the associated logical channel, i.e. MTCH. UE release the MAC configuration for the MRB.
  • Figure 12 illustrates an exemplary flowchart to perform MRB reconfiguration during RRC state transmission from IDLE/INACTIVE to CONNECTED in accordance with embodiments of the current invention.
  • UE establishes a MRB in IDLE/INACTIVE for a multicast service. Then UE transfers to CONNECTED mode for the unicast services.
  • UE sends the multicast interest indication to the network, informing which multicast service is on-going or it is interested in.
  • UE receives the RRC reconfiguration message to reconfigure the MRB as a response to the interest indication.
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.

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Abstract

Cette divulgation concerne des procédés et un appareil permettant de fournir des services de multidiffusion par l'intermédiaire d'une MRB. Une porteuse radio particulière appelée MRB est introduite, qui est associée à un canal logique de multidiffusion et à un canal logique de monodiffusion pour améliorer la fiabilité. Les procédures pour commander la MRB sont nécessaires pour effectuer l'établissement, la reconfiguration et la libération de la MRB. L'UE déclenche l'établissement, la reconfiguration et la libération de la MRB lorsque les événements correspondants se produisent.
PCT/CN2020/121791 2020-10-19 2020-10-19 Procédés et appareil permettant de fournir des services de multidiffusion fiables par l'intermédiaire d'une mrb WO2022082340A1 (fr)

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PCT/CN2020/121791 WO2022082340A1 (fr) 2020-10-19 2020-10-19 Procédés et appareil permettant de fournir des services de multidiffusion fiables par l'intermédiaire d'une mrb
CN202111177971.XA CN114390447B (zh) 2020-10-19 2021-10-09 用于多播广播服务的方法和用户设备
TW110138494A TWI792614B (zh) 2020-10-19 2021-10-18 用於多播廣播服務的方法和使用者設備
US17/504,893 US20220124463A1 (en) 2020-10-19 2021-10-19 Methods and apparatus to deliver reliable multicast services via multicast radio bearer (mrb)

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