RRC-Controlled RLC Reestablishment During Serving Cell Change
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Solution Overview
Problem
The existing serving cell change technique in cellular mobile communication systems, triggered by layer 1 or layer 2 signalling, experiences unnecessary delays due to inefficient processing of RLC entity reestablishment during cell changes.
Innovation Solution
A terminal apparatus and integrated circuit that determine, based on candidate cell configuration, whether to reestablish the RLC entity during serving cell changes, optimizing the RRC processing unit to avoid unnecessary reestablishment when not required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RLC entity is reestablished during every serving cell change triggered by layer 1 or layer 2 signalling, then the reliability of data transmission is improved, but the processing delay and overhead increase unnecessarily
Solution Approach 1:
The invention changes the parameter of RLC entity reestablishment from a fixed action (always reestablish) to a conditional action (reestablish only when configuration differs). The RRC processing unit compares the configuration of the candidate cell with the current serving cell, and only triggers RLC entity reestablishment when the configurations are different, thereby avoiding unnecessary reestablishment operations and reducing processing delay.
2Ease of operation
If the RLC entity is reestablished during every serving cell change, then the communication control is simplified, but the processing overhead increases
Solution Approach 1:
The invention modifies the operational parameter from unconditional reestablishment to conditional reestablishment based on configuration comparison. The RRC processing unit evaluates whether the candidate cell configuration differs from the current cell configuration before initiating RLC entity reestablishment, thereby reducing unnecessary processing overhead while maintaining appropriate communication control.
3Speed
If layer 1 or layer 2 signalling is used to trigger serving cell change, then the signalling delay is reduced, but the RLC processing delay increases due to unnecessary reestablishment
Solution Approach 1:
The invention introduces a conditional parameter change that prevents unnecessary RLC entity reestablishment operations. By comparing cell configurations before triggering reestablishment, the system eliminates redundant processing steps that would otherwise occur after layer 1 or layer 2 signalling, thereby reducing RLC processing delay while preserving the fast signalling benefits.
Data Source
AI summary
A terminal apparatus for communicating with a base station apparatus includes an RRC processing unit. In a case that a serving cell change to a candidate cell is indicated by a lower layer (layer 1/layer 2) of a certain cell group, the RRC processing unit determines, based on a configuration of the candidate cell stored in the RRC processing unit, whether to reestablish an RLC entity in a case of the serving cell change. In a case of determining that the RLC entity is to be reestablished in a case of the serving cell change, the RRC processing unit reestablishes the RLC entity. In a case of determining that the RLC entity is not to be reestablished in a case of the serving cell change, the RRC processing unit does not reestablish the RLC entity.