Search

EP-4503667-B1 - SYSTEMS AND METHODS FOR MULTICAST DATA TRAFFIC SERVICE CONTINUITY UNDER MULTICAST-BROADCAST SERVICES OPERATION DURING RADIO RESOURCE CONTROL STATE TRANSITION

EP4503667B1EP 4503667 B1EP4503667 B1EP 4503667B1EP-4503667-B1

Inventors

  • XU, FANGLI
  • CHEN, YUQIN
  • ROSSBACH, Ralf
  • PALLE VENKATA, Naveen Kumar R.
  • CHENG, PENG
  • KUO, PING-HENG
  • WU, ZHIBIN
  • HU, HAIJING

Dates

Publication Date
20260513
Application Date
20240702

Claims (13)

  1. A method of a user equipment, UE, comprising: receiving, from a network, while in a radio resource control, RRC, connected mode, an RRC release message (1204) comprising an RRC inactive mode point to multipoint, PTM, configuration for the UE that uses a multicast-broadcast services, MBS, session to receive multicast data traffic from the network while the UE is in an RRC inactive mode, wherein the RRC inactive mode PTM configuration further comprises a first MBS radio bearer, MRB, ID of a first MRB of the MBS session for receiving the multicast data traffic while the UE is in the RRC inactive mode; entering the RRC inactive mode (1206) from the RRC connected mode in response to the RRC release message; and using the RRC inactive mode PTM configuration to receive, from the network, the multicast data traffic of the MBS session while the UE is in the RRC inactive mode (1208); wherein a same service data adaptation protocol, SDAP, entity used to receive the multicast data traffic of the MBS session while the UE is in the RRC connected mode is used to receive the multicast data traffic while the UE is in the RRC inactive mode.
  2. The method of claim 1, further comprising: determining, based on the MRB ID, that the first MRB is used to receive the multicast data traffic from the network while the UE is in the RRC connected mode; and re-using the first MRB as used in the RRC connected mode to receive the multicast data traffic while the UE is in the RRC inactive mode.
  3. The method of any of claims 1-2, wherein the first MRB is used to receive the multicast data traffic from the network while the UE is in the RRC connected mode; and further comprising: receiving, from the network, an indication to reuse the first MRB as used in the RRC connected mode to receive the multicast data traffic on the first MRB while the UE is in the RRC inactive mode; and re-using, in response to the indication, the first MRB as used in the RRC connected mode to receive the multicast data traffic while the UE is in the RRC inactive mode.
  4. The method of any of claims 1-3, further comprising: receiving, from the network, while the UE is in the RRC inactive mode, a paging message corresponding to the MBS session; or using MBS session information configured to the UE while the UE is in the RRC connected mode for the MBS session while the UE is in the RRC inactive mode; or receiving, from the network, while the UE is in the RRC connected mode, MBS session information for each of a set of MBS sessions that comprises the MBS session, and wherein the RRC inactive mode PTM configuration comprises an MBS session ID that identifies the MBS session from the set of MBS sessions
  5. The method of any of claims 1-4, wherein the RRC release message further comprises an indication to receive the multicast data traffic while the UE is in the RRC inactive mode; or wherein the RRC inactive mode PTM configuration comprises MBS session information for the MBS session.
  6. The method of any of claims 1-5, further comprising: storing an RRC connected mode PTM configuration used for receiving the multicast data traffic while the UE is in the RRC connected mode; re-entering the RRC connected mode from the RRC inactive mode; and using the RRC connected mode PTM configuration to receive, from the network, the multicast data traffic of the MBS session after re-entering the RRC connected mode.
  7. A method of a radio access network, RAN, comprising: sending, to a user equipment, UE, in a radio resource control, RRC, connected mode, an RRC release message (1302) comprising an RRC inactive mode point to multipoint, PTM, configuration for the UE that uses a multicast-broadcast services, MBS, session to receive multicast data traffic from the network while the UE is in an RRC inactive mode, wherein the RRC inactive mode PTM configuration further comprises a first MBS radio bearer, MRB, identifier, ID, of a first MRB of the MBS session for receiving the multicast data traffic while the UE is in the RRC inactive mode; and transmitting the multicast data traffic of the MBS session to the UE while the UE is in the RRC inactive mode (1034); wherein a same service data adaptation protocol, SDAP, entity used to transmit the multicast data traffic of the MBS session while the UE is in the RRC connected mode is used to transmit the multicast data traffic while the UE is in the RRC inactive mode.
  8. The method of claim 7, further comprising sending, to the UE, an indication to reuse the first MRB as used in the RRC connected mode to receive the multicast data traffic on the first MRB while the UE is in the RRC inactive mode.
  9. The method of any of claims 7-8, further comprising: sending, to the UE, while the UE is in the RRC inactive mode, a paging message corresponding to the MBS session; or sending, to the UE, while the UE is in the RRC connected mode, MBS session information for the MBS session.
  10. The method of any of claims 7-9, wherein the RRC release message further comprises an indication for the UE to receive the multicast data traffic while the UE is in the RRC inactive mode; or wherein the RRC inactive mode PTM configuration comprises MBS session information for the MBS session.
  11. The method of any of claims 7-10, further comprising sending, to the UE, while the UE is in the RRC connected mode, MBS session information for each of a set of MBS sessions that comprises the MBS session, and wherein the RRC inactive mode PTM configuration comprises an MBS session ID that identifies the MBS session from the set of MBS sessions.
  12. An apparatus comprising means to perform the method of any of claim 1 to claim 11.
  13. A computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform the method of any of claim 1 to claim 11.

Description

TECHNICAL FIELD This application relates generally to wireless communication systems, including wireless communication systems that communicate multicast data traffic according to multicast-broadcast services (MBS) arrangements. BACKGROUND Wireless mobile communication technology uses various standards and protocols to transmit data between a base station and a wireless communication device. Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) (e.g., 4G), 3GPP New Radio (NR) (e.g., 5G), and Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard for Wireless Local Area Networks (WLAN) (commonly known to industry groups as Wi-Fi®). As contemplated by the 3GPP, different wireless communication systems' standards and protocols can use various radio access networks (RANs) for communicating between a base station of the RAN (which may also sometimes be referred to generally as a RAN node, a network node, or simply a node) and a wireless communication device known as a user equipment (UE). 3GPP RANs can include, for example, Global System for Mobile communications (GSM), Enhanced Data Rates for GSM Evolution (EDGE) RAN (GERAN), Universal Terrestrial Radio Access Network (UTRAN), Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and/or Next-Generation Radio Access Network (NG-RAN). Each RAN may use one or more radio access technologies (RATs) to perform communication between the base station and the UE. For example, the GERAN implements GSM and/or EDGE RAT, the UTRAN implements Universal Mobile Telecommunication System (UMTS) RAT or other 3GPP RAT, the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE), and NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR). In certain deployments, the E-UTRAN may also implement NR RAT. In certain deployments, NG-RAN may also implement LTE RAT. A base station used by a RAN may correspond to that RAN. One example of an E-UTRAN base station is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB). One example of an NG-RAN base station is a next generation Node B (also sometimes referred to as a g Node B or gNB). A RAN provides its communication services with external entities through its connection to a core network (CN). For example, E-UTRAN may utilize an Evolved Packet Core (EPC) while NG-RAN may utilize a 5G Core Network (5GC). Relevant prior art in the field is represented by the following documents: WO 2022/149489 A1 & US 2023/354465 A1, WO 2022/211499 A1 and XP052315361 (3GPP DRAFT R2-2306147). BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS To easily identify the discussion of any particular element or act, the most significant digit or digits in a reference number refer to the figure number in which that element is first introduced. FIG. 1A illustrates a flow diagram for an MBS broadcast configuration between a UE and a base station, according to embodiments discussed herein.FIG. 1B illustrates an MCCH-Config IE and a CFR-ConfigMCCH-MTCH IE as may be present in a SIB according to a 2-step MBS broadcast configuration, according to some embodiments.FIG. 1C illustrates configuration information that may be present in an MCCH transmission, according to embodiments discussed herein.FIG. 2A illustrates a diagram corresponding to an MBS to MBS handover of a UE from a source base station to a target base station, according to some embodiments.FIG. 2B illustrates a diagram corresponding to an MBS to unicast handover of a UE from a source base station to a target base station, according to some embodiments.FIG. 3 illustrates a flow diagram for signaling between a UE and a network serving the UE during an MRB bearer type change, according to embodiments discussed herein.FIG. 4A through FIG. 4E illustrate various IEs that are used as/are considered an MBS configuration within an MBS multicast service scenario, assuming an RRC connected mode, according to embodiments herein.FIG. 5 illustrates an MRB PDCP configuration IE that may be used in a configuration for MBS broadcast services.FIG. 6A illustrates an RLC bearer configuration IE that may be used in a configuration for MBS multicast services, while FIG. 6B and FIG. 6C together illustrate a PDCP configuration IE that may be used in a configuration for MBS multicast services.FIG. 7 illustrates a flow diagram of a method for service continuity for data traffic of an MBS multicast service between a UE and a network, according to embodiments herein.FIG. 8A illustrates a flow diagram for of a method for service continuity for data traffic of an MBS multicast service between a UE and a network, according to embodiments herein.FIG. 8B illustrates a flow diagram for of a method for service continuity for data traffic of an MBS multicast service between a UE and a network