Conditional Handover MBS Reception Configuration
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Solution Overview
Problem
In 5G/NR mobile communication systems, there is a challenge in maintaining continuous multicast broadcast services during conditional handover processes, which can lead to temporary interruptions and data loss in multicast broadcast reception.
Innovation Solution
The implementation of a communication method where user equipment receives a radio resource control (RRC) reconfiguration message including a conditional handover (CHO) configuration for a candidate cell, allowing it to start multicast broadcast service reception from the candidate cell using a Point-To-Multipoint (PTM) configuration before completing the handover, ensuring seamless service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover is performed in 5G/NR mobile communication systems, then handover reliability is improved, but multicast broadcast service continuity deteriorates due to temporary interruptions and data loss
Solution Approach 1:
The patent applies preliminary action by configuring the user equipment to start receiving multicast broadcast services from the candidate cell before the handover is actually executed. The RRC reconfiguration message includes MBS reception configuration for the candidate cell, enabling the UE to prepare and begin service reception in advance, thus avoiding service interruptions during handover execution.
2Duration of action of stationary object
If handover execution is delayed to maintain service continuity, then service interruption is reduced, but handover latency increases
Solution Approach 1:
The patent resolves this contradiction by performing preliminary configuration and service reception setup before handover execution. The UE receives and processes MBS reception configuration in the RRC reconfiguration message during the preparation phase, so that when handover executes, service continuity is maintained without additional latency.
Data Source
AI summary
A communication method performed by a UE in a mobile communication system for providing a multicast broadcast service (MBS) includes: a step S6 of receiving, from a source cell C1, a radio resource control (RRC) reconfiguration message including a conditional handover (CHO) configuration regarding a candidate cell C2 for CHO; and a step S9 of starting MBS reception from the candidate cell C2 using an MBS reception configuration before performing the CHO in response to the CHO configuration including the MBS reception configuration, the MBS reception configuration allowing an MBS session provided by the candidate cell through Point-To-Multipoint (PTM) to be received.