Layer 2 Mobility MIMO Configuration for Reduced Handover Interruption
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Solution Overview
Problem
Current 5G mobile communication systems experience significant latency and overhead during cell handovers due to L3 measurements and RRC signaling, leading to increased interruption time, which is not suitable for future mobile communication systems requiring lower latency and higher data rates.
Innovation Solution
The implementation of a method that supports layer 2 mobility by receiving specific RRC messages and MAC control elements from a base station, allowing for PDSCH reception based on MIMO layer parameters, and enabling seamless switching between cells with reduced interruption time through L2 mobility configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If L3 measurements and RRC signaling are used for cell handover, then cell switching can be performed, but latency and overhead increase leading to longer interruption time
Solution Approach 1:
The patent segments the handover process into L1 beam switching and L2 configuration switching, allowing independent optimization of each layer. L1 handles rapid beam switching while L2 maintains configuration continuity, eliminating the need for complete L2 resets during handover and thereby reducing interruption time while maintaining reliability
Solution Approach 2:
The patent performs preliminary L2 configuration setup before handover occurs by pre-configuring multiple L2 entities with different cell configurations. This allows the UE to switch between pre-configured L2 entities during handover without performing time-consuming configuration updates, thus reducing interruption time while ensuring reliable cell switching
2Reliability
If L3 measurements and RRC signaling are used for cell handover, then cell switching can be performed, but overhead increases
Solution Approach 1:
The patent divides handover control into separate L1 and L2 layers, allowing L1 to handle rapid beam switching with minimal signaling while L2 manages configuration persistence. This segmentation reduces the amount of RRC signaling required during handover while maintaining reliable cell switching through coordinated layer operations
Solution Approach 2:
The patent introduces L2 entities as intermediaries between L1 physical layer operations and L3 RRC layer configuration. These L2 entities buffer and manage configuration information, reducing the need for direct L3 signaling during handover and thereby reducing overhead while ensuring reliable cell switching
3Reliability
If complete L2 reset is performed during cell handover, then handover can be executed, but interruption time increases
Solution Approach 1:
The patent pre-configures multiple L2 entities with different cell configurations before handover occurs. During handover, the UE simply switches between pre-configured L2 entities without performing time-consuming configuration updates or resets, thereby reducing interruption duration while ensuring reliable handover execution
Solution Approach 2:
The patent makes the L2 configuration dynamic by allowing switching between multiple pre-configured L2 entities during handover. This dynamic switching capability enables the system to adapt to different cell configurations without resetting L2, reducing interruption time while maintaining reliable handover execution
Data Source
AI summary
A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a first RRC message and a second RRC message, receiving from the base station a first MAC CE, performing PDSCH reception based on a first MIMO layer parameter, receiving from the base station a second MAC CE, and performing PDSCH reception based on a second MIMO layer parameter, The first MAC CE comprises an identifier related to the first configuration information and the second configuration information and The second MAC CE comprises an identifier related to the third configuration information and the fourth configuration information.