5G NR MBS Handover Signaling for Broadcast Service Continuity
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Solution Overview
Problem
Existing technologies lack a clear scheme for effectively realizing broadcast/multicast service continuity during handover across base stations in a 5G New Radio (5G-NR) network, particularly for connected User Equipment (UE) mobility.
Innovation Solution
A handover method and apparatus are provided, involving the transmission of Multicast Broadcast Service (MBS) session/bearer information between network devices, with response handling for accepted or unaccepted information, and UE scheduling configuration, ensuring seamless handover across gNBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handover process is implemented across gNBs in 5G-NR network, then UE mobility is enabled, but broadcast/multicast service continuity cannot be guaranteed due to lack of clear handover scheme
Solution Approach 1:
The patent applies preliminary action by establishing a handover preparation phase where the source gNB forwards MBS session information to the target gNB before actual handover execution. This includes transmitting PDCP sequence numbers, bearer configurations, and scheduling information in advance, enabling the target gNB to prepare reception resources before the UE actually moves, thus ensuring service continuity during mobility
Solution Approach 2:
The patent uses the core network (AMF/UDM) as an intermediary to coordinate handover between gNBs. The core network acts as a mediator that manages the handover request-response mechanism, validates MBS session information, and coordinates the overall handover process, ensuring that service continuity is maintained while enabling UE mobility across different base stations
2Reliability
If MBS session information is transmitted during handover, then service continuity is improved, but network device complexity increases due to additional information handling requirements
Solution Approach 1:
The patent applies universality by designing the handover message structure to handle multiple types of MBS session information through a unified framework. The same handover request-response mechanism handles different scenarios (accepted/unaccepted MBS sessions, different bearer configurations), making the network devices more versatile while managing complexity through standardized processing
Solution Approach 2:
The patent manages complexity by dynamically adjusting the handover message parameters based on the specific MBS session requirements. The system changes the level of detail and type of information transmitted depending on whether the MBS session is accepted or rejected, and based on the specific bearer configurations needed, optimizing the balance between service continuity and device complexity
3Reliability
If handover request includes detailed MBS session/bearer information, then service continuity is ensured, but handover processing time increases
Solution Approach 1:
The patent applies segmentation by dividing the handover information into distinct segments: MBS session information, bearer configuration information, and scheduling information. This allows the network devices to process different aspects of the handover independently and in parallel, reducing overall processing time while maintaining complete service continuity through comprehensive information transmission
Data Source
AI summary
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.