WO2024065767A1 - Procédés de communication sans fil pour service de multidiffusion/diffusion et appareils associés - Google Patents

Procédés de communication sans fil pour service de multidiffusion/diffusion et appareils associés Download PDF

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Publication number
WO2024065767A1
WO2024065767A1 PCT/CN2022/123499 CN2022123499W WO2024065767A1 WO 2024065767 A1 WO2024065767 A1 WO 2024065767A1 CN 2022123499 W CN2022123499 W CN 2022123499W WO 2024065767 A1 WO2024065767 A1 WO 2024065767A1
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WO
WIPO (PCT)
Prior art keywords
mbs
multicast
rrc
procedure
base station
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PCT/CN2022/123499
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English (en)
Inventor
Xin Zhang
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Shenzhen Tcl New Technology Co., Ltd.
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Publication date
Application filed by Shenzhen Tcl New Technology Co., Ltd. filed Critical Shenzhen Tcl New Technology Co., Ltd.
Priority to PCT/CN2022/123499 priority Critical patent/WO2024065767A1/fr
Publication of WO2024065767A1 publication Critical patent/WO2024065767A1/fr

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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 the field of wireless communication systems, and more particularly, to wireless communication methods for multicast/broadcast service (MBS) and apparatuses, for example, particularly to an MBS system.
  • MBS multicast/broadcast service
  • broadcast and multicast services may be transported via a transport service called multimedia broadcast/multicast service (MBMS) .
  • MBMS multimedia broadcast/multicast service
  • a broadcast multicast service center (BM-SC) server is responsible to disseminate a media content to a group of subscribers.
  • BM-SC broadcast multicast service center
  • BM-SC broadcast multicast service center
  • MBMS is a point-to-multipoint (PTM) interface specification designed to provide efficient delivery of broadcast and multicast services within 3GPP cellular networks. Examples of MBMS interface specifications include those described in universal mobile telecommunication system (UMTS) and long term evolution (LTE) communication specifications.
  • UMTS universal mobile telecommunication system
  • LTE long term evolution
  • the specifications define transmission over single-frequency network configurations. Intended applications include mobile TV, news, radio broadcasting, file delivery, emergency alerts, and others.
  • MBMS multimedia broadcast/multicast service single frequency network
  • wireless communication devices such as cellular phones, tablets, laptops, and other devices with wireless transceivers that communicate with the base station within the communication system.
  • the base station provides wireless service to the wireless communication devices, sometimes referred to as mobile devices or UEs, within cells.
  • a user can access at least some multimedia services through a UE using either a point-to-point (PTP) connection or a PTM transmission.
  • PTP services can be provided using unicast techniques and PTM transmissions can be provided using MBMS communication, transmitted over an MBSFN or single cell point to multipoint (SC-PTM) communication.
  • PTP point-to-point
  • SC-PTM single cell point to multipoint
  • MBMS is provided using eMBMS. Accordingly, an MBMS service can be provided using either unicast service, MBSFN, or SC-PTM in an LTE system.
  • LTE long term evolution
  • 3GPP has developed NR broadcast/multicast in Rel-17 according to a work item (WID) , aiming to enable general MBS services over 5GS.
  • WID work item
  • the use cases identified that could benefit from this feature include public safety and mission critical, V2X applications, IPTV, live video, software delivery over wireless and IoT applications, etc.
  • Two delivery modes have been agreed for Rel-17 MBS with delivery mode 1 (only for multicast) capable of addressing higher QoS services and delivery mode 2 (only for broadcast) focusing on lower QoS services.
  • delivery mode 1 only for multicast
  • delivery mode 2 only for broadcast
  • the general main goal for Rel-18 should be to enable better deployment of MBS, such as improvement of resource efficiency and capacity based on Rel-17 MBS.
  • RAN only specifies multicast for UEs in RRC_CONNECTED state, which may not fully fulfil the requirements of, e.g., mission critical services, especially for cells with a large number of UEs according to TR 23.774. Also, to always keep UEs in RRC_CONNECTED state is not power efficient. It is therefore important to support multicast for UEs in RRC_INACTIVE.
  • An object of the present disclosure is to propose wireless communication methods for multicast/broadcast service (MBS) and apparatuses.
  • MBS multicast/broadcast service
  • a wireless communication method for multicast/broadcast service (MBS) performed by a user equipment (UE) includes providing an assistance information to a base station for an MBS session allowing the UE in a radio resource control (RRC) inactive state to receive an MBS content, wherein the assistance information includes a UE capability and/or a UE preference.
  • RRC radio resource control
  • a user equipment comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the processor is configured to perform the above method.
  • a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.
  • a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method.
  • a computer readable storage medium in which a computer program is stored, causes a computer to execute the above method.
  • a computer program product includes a computer program, and the computer program causes a computer to execute the above method.
  • a computer program causes a computer to execute the above method.
  • FIG. 1 is a block diagram of one or more user equipments (UEs) and a base station (e.g., gNB) of communication in a communication network system according to an embodiment of the present disclosure.
  • UEs user equipments
  • gNB base station
  • FIG. 2 is a flowchart illustrating a wireless communication method for MBS performed by the UE according to an embodiment of the present disclosure.
  • FIG. 3 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 4 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 5 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 6 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 7 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 8 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 9 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 10 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 11 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 12 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 13 is a flowchart illustrating a wireless communication method for MBS according to an embodiment of the present disclosure.
  • FIG. 14 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.
  • the objectives for Rel-18 include: 1. Specify support of multicast reception by UEs in RRC_INACTIVE state [RAN2, RAN3] . Specify PTM configuration for UEs receiving multicast in RRC_INACTIVE state [RAN2] . Study the impact of mobility and state transition for UEs receiving multicast in RRC_INACTIVE [RAN2, RAN3] . 2.
  • Uu signaling enhancements to allow a UE to use shared processing for MBS broadcast and unicast reception, i.e., including UE capability and related assistance information reporting regarding simultaneous unicast reception in RRC_CONNECTED and MBS broadcast reception from the same or different operators [RAN2] . 3. Study and if necessary, specify enhancements to improve the resource efficiency for MBS reception in RAN sharing scenarios [RAN3] .
  • RAN could enable UEs within an MBS multicast session to receive MBS session data while in RRC Inactive state, which means that within a cell and for a same MBS multicast session, some UEs can be in inactive state and others can be in active state.
  • NW can choose which UEs receive in RRC INACTIVE and which in RRC Connected and can move UEs between the states for Multicast service reception, just like the agreement RANs has made as following.
  • the network can choose which UEs receive in RRC INACTIVE and which in RRC Connected and can move UEs between the states for Multicast service reception.
  • RAN2 On the other side, RAN2 has also made, it is up to gNB to decide whether a multicast session may be received by UE (s) in INACTIVE. FFS what information gNB may be provided to form such decision (related to SA2 discussion) .
  • UEs RRC state receiving multicast services may be influenced by two aspects. One is whether a multicast session may be received by UE (s) in INACTIVE. The other one is NW choose which UEs receive in RRC INACTIVE state and which in RRC Connected state.
  • transmission mode to describe UEs RRC state receiving multicast, implying both of the two aspects mentioned above. Both of the aspects are determined by gNB, which means the transmission mode is determined by gNB.
  • gNB might be provided some sustenance information for making such decision, whatever the assistant information is from 5GC side, UE side or both sides.
  • the assistance information is provided by UEs to gNB by performing registration procedure.
  • the issue we are going to deal with is what might initial UE’s preference (one of the assist information UE provides to gNB) change, and while UE’s preference changes, what procedure should be performed.
  • Part 1 is what information UEs report to gNB to Assist gNB to determine the transmission mode.
  • Part 2 is what messages can be used to transmit the UE report.
  • FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., gNB) 20 for communication in a communication network system 40 according to an embodiment of the present disclosure are provided.
  • the communication network system 40 includes the one or more UEs 10 and the base station 20.
  • the one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13.
  • the base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23.
  • the processor 11 or 21 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21.
  • the memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21.
  • the transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.
  • the processor 11 or 21 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and/or data processing device.
  • the memory 12 or 22 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and/or other storage device.
  • the transceiver 13 or 23 may include baseband circuitry to process radio frequency signals.
  • modules e.g., procedures, functions, and so on
  • the modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21.
  • the memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.
  • the processor 11 is configured to provide an assistance information to a base station for an MBS session allowing the UE in a radio resource control (RRC) inactive state to receive an MBS content, wherein the assistance information includes a UE capability and/or a UE preference.
  • RRC radio resource control
  • MBS refers to multicast.
  • FIG. 2 is a flowchart illustrating a wireless communication method 200 for multicast/broadcast service (MBS) performed by a user equipment (UE) according to an embodiment of the present disclosure.
  • the wireless communication method 200 for MBS performed by the UE includes: a step 202, providing an assistance information to a base station for an MBS session allowing the UE in a radio resource control (RRC) inactive state to receive an MBS content, wherein the assistance information includes a UE capability and/or a UE preference.
  • RRC radio resource control
  • MBS refers to multicast.
  • the UE provides the assistance information to the base station through at least one or a combination of the followings: a UE registration procedure; a UEAssistanceanceInformation report procedure; a UEcapabilityinformation report procedure; an MBS interest indication procedure; and a small data transmission procedure.
  • the UE informs the base station of the UE capability and/or the UE preference, such that the base station makes a decision based on the UE capability and/or the UE preference, the decision refers to, for a multicast service, whether the UE receives the multicast service in a RRC connected state or in the RRC inactive state.
  • the UE indicates the UE capability to receive an MBS multicast using a transmission mode for RRC inactive state and/or the UE indicates the UE preference regarding a connectivity state in which the UE wishes to receive the MBS session.
  • the UE capability and/or UE preference is transmitted in an uplink message comprising an RRC setup request, an RRC setup complete comprising a registration request, an uplink information transfer comprising an identity response, an uplink information transfer comprising an authentication response, an uplink information transfer comprising a security mode complete, a security mode complete, or an RRC reconfiguration complete.
  • the UE receives an indication in an RRC reconfiguration message from the base station when the UE reports a UEAssistanceanceinformation message.
  • the UE capability and/or UE preference regarding supporting multicast reception in an inactive related information element (IE) is added in the UEAssistanceanceInformation message.
  • the UECapabilityInformation report procedure the UE receives an indication in a UECapabilityEnquiry message from the base station when the UE reports a UECapabilityInformation message.
  • the UE capability and/or UE preference regarding supporting multicast reception in an inactive related information element (IE) is added in the UECapabilityInformation message.
  • the MBS interest indication procedure is used to inform the base station that the UE in an RRC connected state is receiving or is interested to receive an MBS broadcast service and to inform the base station about a priority of MBS broadcast versus unicast and multicast MRB reception.
  • the UE in the RRC connected state initiating the MBS interest indication procedure upon a successful connection establishment/resume, upon entering or leaving a broadcast service area, upon an MBS broadcast session starts or stops, upon a change of interest, upon a change of priority between an MBS broadcast reception and a unicast/multicast reception, upon a change to a PCell broadcasting SIB21, upon receiving SIB20 of an SCell via dedicated signaling, or upon a handover.
  • the UE capability and/or UE preference regarding supporting multicast reception in an inactive related information element (IE) is added in an MBSInterestIndication message.
  • IE inactive related information element
  • the UE transmits the assistance information to the base station without going to an RRC connected state.
  • the UE when the UE in an RRC inactive state intends to transmit the assistance information to the base station, the UE triggers the small data transmission procedure, and the assistance information is transmitted during the small data transmission procedure.
  • Assistance information that UE provides to gNB for transmission mode determination :
  • the information includes a UE capability and a UE preference.
  • Whether the transmission mode for inactive reception is applied depends on multiple factors. One important factor is if UEs are capable of receiving multicast service in inactive state. One typical problem is the backward compatibility. UEs supporting Rel-17 MBS but not capable of receiving 5MBS data while in RRC-inactive state. If such UEs that joined an MBS multicast session are in a cell, MBS data need to be transmitted using the Rel-17 transmission mode for RRC-connected reception. Therefore, the first information UE needs to report to gNB is UE capability.
  • the second information that UE could report is UE’s preference.
  • UEs could prefer to receive MBS data in RRC inactive state to reduce their battery consumption, or in RRC connected state to increase the service quality. Therefore, UE could report the preference to gNB to assist gNB to make the decision. If the UE indicates reception in RRC-INACTIVE state is not preferred and if NG-RAN follows the UE preference, the number UEs in a cell that can receive the MBS session will be more limited but the transmission will be more reliable.
  • the assistance information can be transmitted in any of them or the combination of them.
  • FIG. 3 illustrates that, in some embodiments, during UE registration procedure, UE can indicate its capability to receive MBS multicast using the transmission mode for RRC inactive. It may also indicate a preference regarding the connectivity state in which it wishes to receive MBS session (s) .
  • the normal UE registration procedure is specified in TS23.502 as the following (e.g., the initial UE attach procedure) .
  • the UE capability and the UE preference can be transmitted in any of the UL messages sent from the UE to the gNB, such as in an uplink message comprising an RRC setup request, an RRC setup complete comprising a registration request, an uplink information transfer comprising an identity response, an initial context setup request, a security mode complete, or an RRC reconfiguration complete.
  • the UEAssistanceanceInformation message is used for the indication of UE Assistanceance information to the network.
  • the procedure is illustrated as the following.
  • gNB can send an indication in “RRCreconfiguraion” message to acquire UE to include UEs capabilities regarding supporting multicast reception in inactive related information when reporting UEAssistanceanceinformation.
  • the ASN. 1 comprises the UEs capabilities.
  • the UE capabilities related information is reported by UE to gNB by two ways. One is during UE initial attach procedure, and some important UE capabilities information are reported during this procedure, such as the network capabilities UE are capable of support, which is a NAS procedure.
  • the other procedure is UE capabilities enquiry and report procedure.
  • the procedure is as illustrated in FIG. 5.
  • the network initiates the procedure to a UE in RRC_CONNECTED when it needs UE radio access capability information.
  • gNB can send an indication in “UECapabilityEnquiry” message to acquire UE to include UEs capabilities regarding supporting multicast reception in inactive related information when reporting UECapabilityInformation.
  • the current ASN. 1 of “UECapabilityInformation” is defined as TS 38.331.
  • the ASN. 1 comprises the UEs capabilities.
  • the purpose of this procedure is to inform the network that the UE in RRC_CONNECTED state is receiving or is interested to receive MBS broadcast service (s) and to inform the network about the priority of MBS broadcast versus unicast and multicast MRB reception.
  • An MBS capable UE in RRC_CONNECTED may initiate the procedure in several cases including upon successful connection establishment/resume, upon entering or leaving the broadcast service area, upon MBS broadcast session start or stop, upon change of interest, upon change of priority between MBS broadcast reception and unicast/multicast reception, upon change to a PCell broadcasting SIB21, upon receiving SIB20 of an SCell via dedicated signaling, upon handover.
  • MBSInterestIndication message UEs capabilities regarding supporting multicast reception in inactive related information can be added in MBSInterestIndication message.
  • the ASN. 1 comprises the UEs capabilities.
  • WI “NR small data transmissions (SDT) in inactive state” is introduced and specified in R17.
  • the motivation to have this WI is basically as the following:
  • NR supports RRC_INACTIVE state and UEs with infrequent (periodic and/or non-periodic) data transmission are generally maintained by the network in the RRC_INACTIVE state. Until Rel-16, the RRC_INACTIVE state doesn’t support data transmission. Hence, the UE has to resume the connection (i.e., move to RRC_CONNECTED state) for any DL (MT) and UL (MO) data. Connection setup and subsequently release to INACTIVE state happens for each data transmission however small and infrequent the data packets are. This results in unnecessary power consumption and signaling overhead. ”
  • the related information can be regarded as the small data and be transmitted during the SDT procedure.
  • the existing SDT procedure is as the following: 4-step RA-SDT, 2-step RA-SDT and CG-SDT procedure as respectively illustrated in FIG. 8, FIG. 9, and FIG. 10.
  • Some embodiments illustrate that while UE in inactive state intends to transmit the Assistance information to gNB, UE can trigger the SDT procedure, and the Assistance information can be transmitted during the SDT procedure as illustrated in FIG. 11, FIG. 12, and FIG. 13.
  • Part 1 is what information UEs report to gNB to Assist gNB to determine the transmission mode.
  • Part 2 is what messages can be used to transmit the UE report. This is a new requirement introduced in R18 MBS and no such requirements before.
  • FIG. 14 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software.
  • FIG. 14 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other at least as illustrated.
  • the application circuitry 730 may include a circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors.
  • the processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

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Abstract

Sont divulgués des procédés de communication sans fil pour service de multidiffusion/diffusion (MBS) et des appareils associés. Le procédé mis en œuvre par un équipement utilisateur (UE) comprend la fourniture d'informations d'assistance à une station de base pour une session MBS permettant à l'UE dans un état inactif de commande de ressources radio (RRC) de recevoir un contenu MBS, les informations d'assistance comprenant une capacité d'UE et/ou une préférence d'UE. Le MBS peut se référer à la multidiffusion.
PCT/CN2022/123499 2022-09-30 2022-09-30 Procédés de communication sans fil pour service de multidiffusion/diffusion et appareils associés WO2024065767A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN101155343A (zh) * 2006-09-29 2008-04-02 华为技术有限公司 无线网络中终端加入多播广播业务的方法及其系统
WO2021139747A1 (fr) * 2020-01-10 2021-07-15 FG Innovation Company Limited Procédé et équipement d'utilisateur permettant la réception de données de service de diffusion/multidiffusion
WO2021251804A1 (fr) * 2020-06-12 2021-12-16 Samsung Electronics Co., Ltd. Procédé et appareil pour la prise en charge d'un mbs dans un système de communication sans fil
WO2022002830A1 (fr) * 2020-06-29 2022-01-06 Telefonaktiebolaget Lm Ericsson (Publ) Services de multidiffusion et de diffusion pour des équipements utilisateurs dans des états de veille et inactif

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101155343A (zh) * 2006-09-29 2008-04-02 华为技术有限公司 无线网络中终端加入多播广播业务的方法及其系统
WO2021139747A1 (fr) * 2020-01-10 2021-07-15 FG Innovation Company Limited Procédé et équipement d'utilisateur permettant la réception de données de service de diffusion/multidiffusion
WO2021251804A1 (fr) * 2020-06-12 2021-12-16 Samsung Electronics Co., Ltd. Procédé et appareil pour la prise en charge d'un mbs dans un système de communication sans fil
WO2022002830A1 (fr) * 2020-06-29 2022-01-06 Telefonaktiebolaget Lm Ericsson (Publ) Services de multidiffusion et de diffusion pour des équipements utilisateurs dans des états de veille et inactif

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