Search

JP-7856801-B2 - Communication methods, user devices, processors, programs, and mobile communication systems

JP7856801B2JP 7856801 B2JP7856801 B2JP 7856801B2JP-7856801-B2

Inventors

  • 藤代 真人
  • チャン ヘンリー

Assignees

  • 京セラ株式会社

Dates

Publication Date
20260511
Application Date
20240201
Priority Date
20230203

Claims (12)

  1. A communication method used in a mobile communication system that provides multicast/broadcast services (MBS), A user device in a Radio Resource Control (RRC) connected state receives an RRC release message from a network node on a dedicated control channel (DCCH) that includes a point-to-multipoint (PTM) setting for receiving a multicast session in an RRC inactive state, The user device transitions from the RRC connected state to the RRC inactive state in response to receiving the RRC release message, The user device in the RRC inactive state receives the multicast session, The user device receives the RRC release message, which includes the PTM settings, which include the same information elements as those provided on the multicast control channel (MCCH). A communication method for the user device to monitor the MCCH based on the reception of the RRC release message, which includes the PTM setting .
  2. The communication method according to claim 1, wherein the PTM setting includes an MBS session information list that provides the settings for each MBS session provided by multicast.
  3. The communication method according to claim 1, wherein the PTM setting includes a list of neighboring cells that provide MBS multicast services.
  4. The communication method according to claim 1, wherein the PTM setting includes a list of DRX settings.
  5. The communication method according to claim 1, wherein the PTM setting includes parameters for obtaining a PDSCH for MTCH.
  6. The communication method according to claim 1, wherein the PTM setting is a setting relating to a multicast session being received by the user device in the RRC connected state.
  7. The communication method according to claim 6, wherein the user device continues to receive the multicast session in the RRC inactive state based on the PTM setting.
  8. The communication method according to claim 1, wherein the user device receives the RRC release message from the network node when the multicast session is inactive.
  9. A user device used in a mobile communication system that provides multicast/broadcast services (MBS), When the user device is in a Radio Resource Control (RRC) connected state, the receiving unit receives an RRC release message from a network node on a dedicated control channel (DCCH) that includes a point-to-multipoint (PTM) setting for receiving multicast sessions in an RRC inactive state, The user device includes a control unit that transitions from the RRC connected state to the RRC inactive state in response to the receipt of the RRC release message, The receiving unit receives the multicast session when the user device is in the RRC inactive state. The receiving unit receives the RRC release message , which includes the PTM settings, which include the same information elements as those provided on the multicast control channel (MCCH). The control unit is a user device that monitors the MCCH based on the reception of the RRC release message, which includes the PTM setting .
  10. A processor that causes a user device to execute the communication method described in claim 1.
  11. A program that causes a user device to execute the communication method described in claim 1.
  12. A mobile communication system comprising a user device as described in claim 9 and a network node.

Description

This disclosure relates to a communication method used in a mobile communication system. The 3GPP (3rd Generation Partnership Project) defines the technical specifications for NR (New Radio), a fifth-generation (5G) wireless access technology. Compared to LTE (Long Term Evolution), a fourth-generation (4G) wireless access technology, NR features high speed, large capacity, high reliability, and low latency. The 3GPP also defines the technical specifications for 5G/NR multicast/broadcast services (MBS). In 3GPP Release 17, MBS multicast reception (i.e., multicast reception) is only possible for user devices in a Radio Resource Control (RRC) connected state (see, for example, Non-Patent Document 1). In contrast, 3GPP Release 18 is planned to extend the technical specifications to allow user devices in an RRC inactive state to perform multicast reception. 3GPP Technical Specification: TS 38.300 V17.3.0 The first aspect of the communication method is a communication method used in a mobile communication system that provides multicast/broadcast services (MBS), comprising the step of a user device in a radio resource control (RRC) connected state receiving point-to-multipoint (PTM) settings relating to a multicast session from a base station on a dedicated control channel (DCCH). The receiving step includes receiving the PTM settings on the DCCH from the base station, which include the same information elements as the information elements provided on the multicast control channel (MCCH). The second aspect of the communication method is a communication method used in a mobile communication system that provides multicast/broadcast services (MBS), and comprises the step of a user device that is in a radio resource control (RRC) connected state and has already joined a multicast session receiving configuration information from a base station on a dedicated control channel (DCCH). If the multicast session has not yet been activated, the receiving step includes receiving configuration information from the base station regarding permission for multicast reception in an RRC inactive state. This diagram shows the configuration of a mobile communication system according to an embodiment.This diagram shows the configuration of the UE (User Equipment) according to the embodiment.This diagram shows the configuration of a gNB (base station) according to the embodiment.This diagram shows the protocol stack configuration of the user-plane wireless interface that handles data.This diagram shows the protocol stack configuration of the wireless interface of the control plane that handles signaling (control signals).This diagram shows the MBS Broadcast Configuration message in MCCH as defined in the RRC technical specification (TS38.331).This diagram shows an overview of the operation that enables UE100, which is in an RRC inactive state, to perform multicast reception.This is a diagram illustrating the overview of the operation according to the first embodiment.This figure shows an example of the first operation pattern of the first embodiment.This figure shows an example of a second operation pattern of the first embodiment.This figure shows an example of the first operation pattern of the second embodiment.This figure shows an example of the second operation pattern of the second embodiment.This diagram illustrates an example of operation when distribution mode 2 is applied to MBS multicast.This diagram shows the configuration of SIB20 as defined in the RRC specification (TS38.331) of 3GPP Release 17.This is a diagram illustrating the operation of a mobile communication system according to another embodiment.This diagram shows the PTM configuration distribution procedure for an activated multicast session. The mobile communication system according to the embodiment will be described with reference to the drawings. In the drawings, identical or similar parts are denoted by the same or similar reference numerals. (1) First Embodiment The first embodiment will be described with reference to Figures 1 to 10. (1.1) System Configuration Figure 1 is a diagram showing the configuration of the mobile communication system 1 according to the embodiment. The mobile communication system 1 conforms to the 5th Generation System (5GS) of the 3GPP standard. In the following description, 5GS will be used as an example, but the mobile communication system may also have an LTE (Long Term Evolution) system applied to it at least partially. The mobile communication system may also have a 6th Generation (6G) system applied to it at least partially. The mobile communication system 1 comprises a user equipment (UE) 100, a 5G radio access network (NG-RAN: Next Generation Radio Access Network) 10, and a 5G core network (5GC: 5G Core Network) 20. Hereinafter, NG-RAN 10 may be simply referred to as RAN 10, and 5GC 20 may be simply referred to as the core network (CN) 20. RAN 10 and CN 20 constitute the network 5 of the mobile communication system 1. UE100 is