JP-7855793-B2 - Communication methods, user devices, programs, chipsets, and systems

Inventors

• 藤代 真人

Assignees

• 京セラ株式会社

Dates

Publication Date

20260508

Application Date

20240401

Priority Date

20230404

Claims (6)

1. A communication method performed by user equipment in a mobile communication system that provides multicast/broadcast services (MBS), The configuration includes configuration information including a Point-to-Multipoint (PTM) setting used for receiving multicast sessions in a Radio Resource Control (RRC) inactive state, and receiving an RRC release message from a network node to transition the user device to the RRC inactive state. In accordance with the RRC release message containing the configuration information, the multicast session is received in the RRC inactive state, A communication method comprising: interrupting the use of a first data transmission bearer used in the RRC connected state and establishing a second data transmission bearer based on the setting information for use in the RRC inactive state, in response to the receipt of the RRC release message.
2. The communication method according to claim 1, further comprising using the first data transmission bearer to receive specific content data in the RRC connected state before receiving the RRC release message.
3. A user device used in a mobile communication system that provides multicast/broadcast services (MBS), A receiving unit that includes configuration information including a PTM (Point-to-Multipoint) setting used for receiving multicast sessions in a Wireless Resource Control (RRC) inactive state, and receives an RRC release message from a network node to transition the user device to the RRC inactive state, The system includes a control unit that, upon receiving the RRC release message, interrupts the use of a first data transmission bearer used in the RRC connected state and establishes a second data transmission bearer used in the RRC inactive state based on the setting information, The receiving unit is a user device that receives the multicast session in the RRC inactive state in response to the RRC release message containing the configuration information.
4. A program for a user device used in a mobile communication system that provides multicast/broadcast services (MBS), wherein the user device has the following capabilities: The process includes configuration information including a Point-to-Multipoint (PTM) setting used for receiving multicast sessions in a Radio Resource Control (RRC) inactive state, and receiving an RRC release message from a network node to transition the user device to the RRC inactive state. Depending on whether the RRC release message includes the configuration information, the process of receiving the multicast session in the RRC inactive state is performed. A program that, upon receiving the RRC release message, performs the following processes: interrupting the use of a first data transmission bearer used in the RRC connected state, and establishing a second data transmission bearer based on the configuration information used in the RRC inactive state.
5. A chipset for user equipment used in a mobile communication system that provides multicast/broadcast services (MBS), The process includes configuration information including a Point-to-Multipoint (PTM) setting used for receiving multicast sessions in a Radio Resource Control (RRC) inactive state, and receiving an RRC release message from a network node to transition the user device to the RRC inactive state. Depending on whether the RRC release message includes the configuration information, the process of receiving the multicast session in the RRC inactive state is performed. A chipset that, upon receiving the RRC release message, performs the following processes: interrupting the use of a first data transmission bearer used in the RRC connected state, and establishing a second data transmission bearer based on the configuration information used in the RRC inactive state.
6. A system including user equipment and network nodes used in a system that provides multicast/broadcast services (MBS), The User device is A receiving unit that includes configuration information including a Point-to-Multipoint (PTM) setting used for receiving multicast sessions in a Radio Resource Control (RRC) inactive state, and receives an RRC release message from the network node to transition the user device to the RRC inactive state, The system includes a control unit that, upon receiving the RRC release message, interrupts the use of a first data transmission bearer used in the RRC connected state and establishes a second data transmission bearer based on the setting information used in the RRC inactive state, The receiving unit receives the multicast session in the RRC inactive state, in response to the RRC release message containing the configuration information. The aforementioned network node is A system having a transmission unit that transmits the RRC release message containing the aforementioned configuration information and the multicast session to the user device.

Description

This disclosure relates to communication methods , user devices , programs, chipsets, and systems used in mobile communication systems. 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 performed by a user device in a mobile communication system that provides multicast/broadcast services (MBS). The communication method includes configuration information including a Point-to-Multipoint (PTM) setting used for receiving a multicast session in a Radio Resource Control (RRC) inactive state, and comprises receiving an RRC release message from the network to transition the user device to the RRC inactive state, and receiving the multicast session in the RRC inactive state in response to the RRC release message containing the configuration information. The second aspect of the communication method is a method performed by a user device in a mobile communication system that provides multicast/broadcast services (MBS). The communication method includes the steps of: receiving a multicast session from a network in the RRC connected state using a first multicast radio bearer (MRB) for the radio resource control (RRC) connected state; receiving an RRC release message from the network to transition the user device to the RRC inactive state, which includes configuration information indicating the settings of a second MRB used for receiving the multicast session in the RRC inactive state; and establishing the second MRB by applying the configuration information before suspending the first MRB in response to the receipt of the RRC release message. The user device according to the third embodiment is a device used in a mobile communication system that provides multicast/broadcast services (MBS). The user device includes a control unit that performs the following: a process of receiving a multicast session from the network in the RRC connected state using a first multicast radio bearer (MRB) for the radio resource control (RRC) connected state; a process of receiving an RRC release message from the network to transition the user device to the RRC inactive state, which includes configuration information indicating the settings of a second MRB used for receiving the multicast session in the RRC inactive state; and a process of applying the configuration information to establish the second MRB before suspending the first MRB in response to the receipt of the RRC release message. This is a diagram showing an example configuration of a mobile communication system according to the embodiment.This figure shows an example configuration of a UE (User Equipment) according to the embodiment.This figure shows an example 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 an overview of the operation of the UE according to the embodiment.This figure shows an example of the operation sequence of a mobile communication system according to the embodiment.This figure shows an example of specification change 1 according to the embodiment.This figure shows an example of specification change 2 according to the embodiment.This diagram shows the initial setup procedures for an ongoing session (left) and a stopped session (right). 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) Example of System Configuration Figure 1 is a diagram showing an example of the configuration of a 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