Method and apparatus for performing reconfiguration for mobility in mobile wireless communication system
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Solution Overview
Problem
Current wireless communication systems face challenges with high latency and signaling overhead during serving cell changes, particularly in 5G systems, which require efficient mobility mechanisms with reduced interruption time and signaling overhead.
Innovation Solution
A method involving RRC and MAC CE signaling for UE mobility, including receiving configurations, determining radio bearers, and releasing them based on specific comparisons, to optimize synchronous reconfiguration and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous reconfiguration is performed using traditional RRC signaling for serving cell changes, then mobility management is achieved, but latency and signaling overhead increase
Solution Approach 1:
The patent segments the reconfiguration process into two parts: configuration preparation (RRC signaling) and configuration activation (MAC CE). This allows the mobility management to be prepared in advance while the actual cell change is executed quickly through MAC CE, reducing the latency of serving cell changes while maintaining reliable mobility management.
Solution Approach 2:
The patent performs preliminary configuration preparation through RRC signaling before the actual serving cell change is needed. The UE receives and processes reconfiguration parameters in advance, so when cell change is triggered, the activation can happen quickly using MAC CE without extensive processing delays, thus reducing latency while ensuring reliable mobility management.
2Reliability
If synchronous reconfiguration is performed using traditional RRC signaling for serving cell changes, then mobility management is achieved, but signaling overhead increases
Solution Approach 1:
The patent segments the signaling into configuration preparation (RRC) and activation (MAC CE). The RRC signaling carries the reconfiguration parameters in advance, while the MAC CE only carries a compact activation indicator. This segmentation reduces the signaling overhead during actual cell changes while maintaining complete mobility management capability.
Solution Approach 2:
The patent extracts the activation function from the full RRC reconfiguration signaling and implements it separately through MAC CE. This extraction allows the bulk of the configuration data to be prepared once via RRC, while subsequent cell changes only require compact MAC CE activation signals, significantly reducing signaling overhead while preserving mobility management reliability.
3Manufacturing precision
If complete L2 and L1 resets are performed during serving cell change, then reconfiguration is thorough, but interruption time increases
Solution Approach 1:
The patent performs preliminary configuration preparation through RRC signaling before the actual cell change. This allows the reconfiguration parameters to be processed and validated in advance, so that when the MAC CE activation occurs, the UE can quickly apply the pre-prepared configuration without extensive processing, reducing interruption time while maintaining thorough reconfiguration.
Solution Approach 2:
The patent enables the UE to skip extensive configuration processing during the actual cell change by using pre-prepared RRC configuration parameters. The MAC CE activation triggers immediate application of the pre-processed configuration, allowing the system to rush through the cell change process quickly while still achieving complete reconfiguration, thus reducing interruption time.
Data Source
AI summary
A method and an apparatus for LTM operations is provided. The method enables signaling overhead reduction and efficient operation by maximizing the common signaling while maintaining signaling flexibility. The method also enables adding and releasing configurations based on reference signaling and delta signaling. The method also provides technique for PDCP buffer management for synchronous reconfiguration based on LTM.