RRC Reestablishment and SCG Failure Handling in Multi-Base Station Links
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-Advanced, handling failures in communications between multiple base stations is challenging due to overlapping operations of RRC connection reestablishment and SCG failure information procedures, leading to potential wrong responses from user equipment and base stations.
Innovation Solution
A communication device and method that connects to multiple base stations, detects connection failures, performs RRC connection reestablishment, and transmits SCG failure information messages after completing RRC reestablishment, or stops the SCG failure information procedure to avoid overlapped operations and incorrect determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs both RRC connection reestablishment procedure and SCG failure information procedure simultaneously upon detecting connection failures, then the UE responds to both failures, but the operations collide and wrong responses are generated
Solution Approach 1:
The patent applies preliminary action by having the UE prioritize and complete the RRC connection reestablishment procedure first before executing the SCG failure information procedure. The UE suspends the SCG failure information procedure when RRC reestablishment is detected, ensuring that the reestablishment procedure completes its operations (including transmitting RRCConnectionReestablishmentComplete message) before the SCG failure information procedure is resumed or executed. This sequential ordering prevents operational collisions and ensures correct failure handling responses.
2Speed
If the UE transmits SCG failure information message before completing RRC connection reestablishment, then the failure information is reported timely, but the base station may incorrectly determine the RRC connection reestablishment status
Solution Approach 1:
The patent ensures that the RRC connection reestablishment procedure is completed first (including the transmission of RRCConnectionReestablishmentComplete message from UE to base station) before the SCG failure information message is transmitted. This preliminary completion of reestablishment ensures that the base station has accurate knowledge of the RRC connection status before receiving failure information, preventing incorrect determinations about whether the reestablishment succeeded or failed.
Solution Approach 2:
The patent segments the failure handling process into distinct sequential phases: first the RRC connection reestablishment phase, then the SCG failure information reporting phase. By dividing the overall failure handling into separate procedural stages with clear boundaries (completion of reestablishment messages as delimiters), the system avoids the confusion that would arise from simultaneous or overlapping message transmissions.
Data Source
AI summary
A communication device comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise being configured to connect to a first base station and a second base station; detecting a connection failure in a first cell of the first base station when performing a secondary cell group (SCG) failure information procedure; performing a radio resource control (RRC) connection reestablishment procedure in response to the detection of the connection failure; and transmitting a SCG failure information message of the SCG failure information procedure to the first base station after transmitting a RRC connection reestablishment complete message of the RRC connection reestablishment procedure, or stopping performing the SCG failure information procedure in response to the connection failure or the RRC connection reestablishment procedure.