MBS Conditional Handover for Continuous Multicast Sessions
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Solution Overview
Problem
Existing MBS technologies fail to ensure service continuity and reliability during handover due to the lack of consideration for multicast and broadcast services, leading to interruptions in MBS sessions or bearers during handover procedures.
Innovation Solution
Implementing a method and apparatus that includes receiving and transmitting CHO configuration information with MBS-specific criteria, such as cell lists and session information, to determine target cells that support ongoing MBS sessions or bearers, ensuring seamless handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional handover procedures are used for MBS, then handover speed is improved, but service continuity deteriorates due to MBS session interruptions
Solution Approach 1:
The system performs preliminary actions by pre-configuring CHO parameters and MBS information in candidate target cells before handover is needed. The source base station provides CHO configuration information including execution conditions and MBS session/bearer information to the UE in advance, so that when handover is triggered, the UE can immediately execute to a suitable cell without interrupting MBS services.
Solution Approach 2:
The system implements feedback mechanisms where the UE reports MBS reception status and measurement information to the source base station. The source base station uses this feedback to determine appropriate execution conditions for CHO and to select target cells that can maintain MBS service continuity, creating a closed-loop control system that adapts to real-time conditions.
2Reliability
If MBS-specific criteria are added to handover procedures, then service continuity is improved, but procedure complexity increases
Solution Approach 1:
The system achieves universality by integrating MBS-specific handover criteria into the existing CHO framework. The CHO configuration information structure is designed to accommodate both conventional handover parameters and MBS-specific parameters (such as MBS session information, bearer information, and service area identities) within a unified message format, allowing the same procedure to handle both general and MBS-specific handover requirements.
Solution Approach 2:
The handover procedure is segmented into distinct information elements: CHO configuration information containing execution conditions, MBS information containing session and bearer details, and cell list information. This segmentation allows each component to be processed independently while maintaining overall procedure coherence, reducing the cognitive complexity of implementing MBS-specific criteria.
3Loss of information
If CHO configuration information including MBS information is transmitted, then information completeness is improved, but message overhead increases
Solution Approach 1:
The system extracts only the essential MBS-related information needed for handover decision-making and includes it in the CHO configuration message. Specifically, it extracts MBS session information (identifying ongoing sessions), MBS bearer information (identifying active bearers), and cell list information (identifying cells providing MBS services). This selective extraction provides sufficient information for service continuity while avoiding transmission of redundant data.
Data Source
AI summary
Embodiments of the present application are related to a method and apparatus for multicast and broadcast services (MBS). According an embodiment of the present application, an exemplary method includes: receiving conditional handover (CHO) configuration information, wherein the CHO configuration information indicates a set of execution conditions for a set of candidate cells, each execution condition being associated with a candidate cell; and executing a CHO procedure to a target cell of the set of candidate cells in response to at least one of the set of execution conditions is met, wherein the target cell is determined based on the set of execution conditions and MBS information associated with CHO.