Subsequent CPAC Handling for SRB5 Re-Establishment in Dual Connectivity
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Solution Overview
Problem
The complexity in managing and coordinating resources between master and secondary nodes in dual connectivity scenarios, particularly when connected via non-ideal backhaul, leads to increased latency and reduced efficiency in resource utilization, along with power consumption and processing overhead in UE operations, especially during conditional PSCell addition or change procedures.
Innovation Solution
A method and apparatus for handling signaling radio bearer 5 configuration during subsequent CPAC, including self-optimizing network functionalities for secure and reliable execution, automatic re-establishment of PDCP and RLC entities, and efficient management of application layer measurements, ensuring seamless communication and optimized resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional PSCell addition or change procedures are implemented to improve mobility management, then mobility robustness is improved, but processing overhead and latency in UE operations increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate PSCells with their measurement configurations and execution conditions before mobility events occur. The UE stores these conditional reconfiguration configurations in advance, allowing rapid execution when conditions are met, thereby reducing processing overhead and latency during actual mobility procedures while maintaining robustness.
2Adaptability or versatility
If multiple candidate configurations are stored and managed in UE for subsequent CPAC, then mobility flexibility is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the configuration management by separating stored conditional reconfiguration configurations from currently executed configurations. The UE maintains distinct storage structures for candidate PSCell configurations received via RRCReconfiguration messages, allowing independent management and retrieval without interfering with active configurations, thereby reducing overall device complexity.
Solution Approach 2:
The UE implements self-service by autonomously determining which stored conditional reconfiguration configuration to execute based on pre-configured execution conditions. The device independently evaluates measurement results against stored conditions and triggers appropriate PSCell changes without continuous network intervention, reducing complexity while maintaining flexibility.
3Reliability
If subsequent CPAC procedures are executed with multiple candidate configurations, then service continuity is improved, but power consumption and processing overhead increase
Solution Approach 1:
The patent implements periodic action through conditional evaluation where the UE periodically measures candidate PSCell configurations against pre-stored execution conditions rather than continuously processing all configurations. This periodic evaluation approach maintains service continuity by readying multiple candidates while reducing power consumption by activating full processing only when conditions are met.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates and satisfying various service requirements. A method performed by a terminal in a wireless communication system includes receiving, from a base station, a first RRC reconfiguration message including at least one candidate configuration for a subsequent CPAC, storing the at least one candidate configuration for the subsequent CPAC; selecting a configuration from the at least one candidate configuration for the subsequent CPAC for an execution of the subsequent CPAC, the configuration being not stored in an SCG variable for storing conditional reconfiguration; determining whether a radio bearer configured in the terminal is an SRB 5 and an sk-counter value is updated due to the execution of the subsequent CPAC; and in case that the radio bearer is the SRB 5 and the sk-counter value is updated due to the execution of the subsequent CPAC, triggering a PDCP entity of the SRB 5 to perform a PDCP re-establishment.