Multicast Radio Bearer Identifier Change During Handover
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Solution Overview
Problem
Current mobile and wireless telecommunication systems face challenges in changing multicast and broadcast service radio bearer identifiers without service interruption, particularly during handovers, due to the lack of coordination between cells and the UE-specific nature of DRB identifiers.
Innovation Solution
The method involves receiving a radio resource control reconfiguration message with a new multicast and broadcast service radio bearer identifier, allowing the user equipment to associate and switch to the new identifier without releasing and adding a new radio bearer, thereby maintaining continuous service by using the same PDCP entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast and broadcast service radio bearer identifiers are changed during handover, then service continuity is improved, but coordination complexity between cells increases
Solution Approach 1:
The patent changes the MRB identifier parameter during handover by providing a new MRB identifier in the handover command message. The UE applies the new identifier to the existing MRB without releasing and adding, thereby changing the identifier parameter while maintaining service continuity. This resolves the contradiction by enabling identifier changes that improve reliability without requiring complex coordination procedures.
2Adaptability or versatility
If radio bearer release and add procedures are used to change identifiers, then identifier changes are achieved, but service interruption occurs
Solution Approach 1:
The patent applies preliminary action by providing the new MRB identifier in advance within the handover command message before the handover execution. The UE is pre-configured with the new identifier and applies it seamlessly during the handover process, avoiding service interruption. This eliminates the need for release and add procedures while maintaining both identifier flexibility and service continuity.
3Adaptability or versatility
If UE-specific DRB identifier schemes are used, then individual customization is achieved, but coordination between cells becomes difficult
Solution Approach 1:
The patent extracts the MRB identifier from the UE-specific DRB identifier scheme and creates a separate MRB identifier space. This allows MRB identifiers to be changed independently of DRB identifiers, enabling cell-specific MRB identifier assignments without affecting UE-specific DRB configurations. The extraction resolves the coordination difficulty while preserving UE-specific customization capabilities.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for changing MRB ID without requiring release and add functions. One method may include receiving, by a user equipment, a RRC reconfiguration message from a network entity comprising a MRB. The MRB is identified by a first MRB ID, and the RRC reconfiguration message further comprises a second MRB ID associated with the first MRB ID. The user equipment associates the MRB with the second MRB ID configured for subsequent identification of the MRB. The user equipment receives MBS data through the MRB associated with the second MRB ID.