LTM Cell Switch RLF Reporting for 5G Mobility
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Solution Overview
Problem
Current wireless communication systems, particularly 5G NR, face challenges in efficiently managing lower-layer triggered mobility (LTM) and coexistence with conditional handover (CHO), conditional primary secondary cell (PSCell) addition, or conditional PSCell Change (CPC).
Innovation Solution
The proposed solution involves enhancing LTM by providing methods for handling coexistence between LTM and CHO, CPA, or CPC, and improving reporting of conditions for conditional LTM. This includes transmitting RLF reports based on LTM cell switch failures, providing additional SCG failure information, and enhancing reporting of conditions for mobility robustness optimization (MRO).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LTM cell switch command is transmitted to enable fast mobility switching, then mobility speed and responsiveness are improved, but system complexity and failure risk increase due to coordination requirements with CHO, CPA, and CPC
Solution Approach 1:
The patent segments the mobility management process by introducing distinct failure type classifications (first failure type for LTM-specific issues, second failure type for general RLF) and separate reporting mechanisms. This segmentation allows the system to handle different failure scenarios independently, reducing the complexity of coordinating multiple mobility mechanisms while maintaining fast switching capability.
Solution Approach 2:
The RLF report serves as an intermediary mechanism that carries failure type information from the UE to the network entity. This intermediary structure enables the network to distinguish between LTM-related failures and general radio link failures, facilitating appropriate error handling without requiring complex direct coordination between LTM, CHO, CPA, and CPC mechanisms.
2Reliability
If detailed failure information is reported to improve error handling, then reliability is improved, but information processing overhead and reporting complexity increase
Solution Approach 1:
The patent applies local quality by providing different levels of information detail based on the specific failure scenario. The RLF report includes failure type information that is locally optimized for each failure case - containing detailed LTM configuration information for first failure types, and general RLF information for second failure types. This reduces overall information processing overhead while maintaining high reliability for error handling.
Solution Approach 2:
The system implements partial action by selectively reporting information based on failure type. Rather than always reporting complete detailed information, the RLF report includes only the necessary failure type classification and relevant configuration details for the specific failure scenario, reducing information processing overhead while maintaining sufficient reliability for error handling.
Data Source
AI summary
Apparatus, methods, and computer program products for wireless communication are provided. An example method may include receiving, from a network entity, an LTM configuration. The example method may further include receiving, from the network entity, an LTM cell switch command associated with the LTM configuration. The example method may further include transmitting, to the network entity, a RLF report based on a failure of an LTM cell switch based on the LTM cell switch command or an RLF after the LTM cell switch based on the LTM cell switch command, the RLF report including information associated with the LTM configuration or the LTM cell switch command.