A communication method implemented by an apparatus includes that a source access network element sends information of a unicast quality of service (QoS) flow of a protocol data unit (PDU) session corresponding to a multicast QoS flow of a multicast broadcast service (MBS) to a target access network element in a handover procedure. The target access network element forwards the information to a session management network element. The session management network element then indicates a user plane network element connected to the target access network element to send data of the MBS to a terminal device through the target access network element and by using a resource of the unicast QoS flow corresponding to the multicast QoS flow of the MBS.

Provided are a cell reselection method and apparatus, a terminal device, and a network device. The method includes: receiving, by a terminal device, first configuration information transmitted by a serving cell, the first configuration information being used to determine at least one of: MBMS service deployment information of an adjacent frequency, MBMS service deployment information of a neighboring cell, a bandwidth of an initial BWP of the neighboring cell, a sub-carrier spacing of the initial BWP of the neighboring cell, a bandwidth of an MBMS BWP of the neighboring cell, and a sub-carrier spacing of the MBMS BWP of the neighboring cell; and determining, by the terminal device based on the first configuration information device, a target cell for cell reselection.

Embodiments of the present disclosure provide a method for implementing multicast broadcast service handover at a computer device acting as user equipment. The method includes: obtaining a PDU session associated with the MBS session, S-NSSAI of the PDU session being the same as S-NSSAI of the MBS session, and a DNN of the PDU session being the same as a DNN of the MBS session; obtaining an MBS session identity of the MBS session; obtaining, from an MB-SMF according to the MBS session identity, quality of service flow information corresponding to the activated MBS session; and establishing, on the PDU session according to the quality of service flow information corresponding to the activated MBS session, a quality of service flow corresponding to the activated MBS session, the quality of service flow corresponding to the activated MBS session including one or more quality of service flows.

The present disclosure provides a method and device for notifying an MBS state.

According to the method of the present disclosure, without increasing signaling, it enables the network to establish a correct transmission mode, improves the utilization rate of network resources, reduces transmission delay, and reduces data loss and delay caused by handover when UE moves. Specifically, the method comprises: receiving, by a mobile management entity (AMF), state information of MBS; and determining, by the AMF, whether to enable a user equipment (UE) to enter an idle mode according to the state information.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain a set of measurements related to a unicast service channel based at least in part on one or more reference signals associated with the unicast service channel and a set of measurements related to a multicast/broadcast service (MBS) channel based at least in part on one or more reference signals associated with the MBS channel. The UE may apply one or more communication parameters to ensure continuity for an MBS service. For example, in some aspects, the one or more communication parameters are based at least in part on the set of measurements related to the unicast service channel and the set of measurements related to the MBS channel. Numerous other aspects are provided.

A method for operating a User Equipment, UE, in a wireless communication network. The method includes acquiring broadcast information comprising redirection information and performing a cell selection or cell reselection procedure based on the acquired broadcasted information. A corresponding UE and a computer program are also disclosed. There is also disclosed a method for operating a network node serving a User Equipment, UE, in a wireless communication network. The method includes broadcasting information having redirection information enabling the UEs to perform a cell selection or cell reselection procedure. A corresponding network node and computer program are also disclosed.

The present disclosure relates to multicast-broadcast service (MBS) area control in wireless communications. According to an embodiment of the present disclosure, a method performed by a distributed unit (DU) in a wireless communication system comprises: transmitting, to a central unit (CU), information informing multicast-broadcast service (MBS) areas supported by the DU; receiving, from the CU, configurations for one or more MBS areas comprising a configuration for a first MBS area and a configuration for a second MBS area; providing an MBS service to a plurality of wireless devices based on the configuration for the first MBS area; receiving, from the plurality of wireless devices, feedback information for the first MBS area; transmitting, to the CU, a status message comprising an identity (ID) of the first MBS area and information obtained from the feedback information for the first MBS area; receiving, from the CU, a message for requesting a change of an MBS area, wherein the message comprises information for the second MBS area; and providing an MBS service based on the configuration for the second MBS area.

According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes receiving, from a base station (BS), multicast broadcast service (MBS) configuration information including information about at least one hybrid automatic repeat request (HARQ) process for an MBS, receiving, from the BS, MBS data based on the MBS configuration information, and processing the MBS data based on an HARQ process corresponding to the MBS data among the at least one HARQ process for the MBS.

Provided are a handover method and apparatus, and an information transmitting method and apparatus. The handover method includes: transmitting a handover request to a second network device, the handover request carrying Multicast Broadcast Service (MBS) session/bearer information; and receiving a handover request response transmitted by the second network device, the handover request response including at least one of the following: MBS session/bearer information that can be accepted by the second network device, MBS session/bearer information that cannot be accepted by the second network device, UE (User Equipment) scheduling configuration information of the second network device, or bearer configuration information of the second network device.

A communication method, applied to a scenario wherein a terminal device is moving from a source access network device to a target access network device and performing a multicast service, includes obtaining, by the target access network device, reference information of the multicast service, The reference information includes area information. The area information corresponds to a sub-service area of the multicast service. The method also includes sending, by the target access network device, information about a forwarding path based on the reference information. The forwarding path is used for the target access network device receiving data of the multicast service.