Primary Secondary Cell Configuration Using Delta RRC Updates
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Solution Overview
Problem
The existing CPAC mechanism in Rel-17 leads to high overheads of signaling transmission and terminal storage due to the use of full configurations during primary secondary cell addition or change procedures.
Innovation Solution
A method where a master node determines candidate primary secondary cells and delivers delta configuration information to a terminal, reducing RRC signaling and terminal storage overheads by using reference configuration information and RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full configuration is used during CPAC procedure, then terminal can access candidate primary secondary cell, but signaling transmission overhead and terminal storage overhead are extremely high
Solution Approach 1:
The patent extracts only the necessary configuration changes from the full configuration and transmits them as delta configurations. The master node identifies the differences between the current SCG configuration and the candidate SCG configuration, then transmits only these differences to the terminal, significantly reducing signaling overhead while maintaining the ability to access candidate cells.
Solution Approach 2:
The configuration information is segmented into a reference configuration (stored in terminal) and a delta configuration (transmitted during CPAC). This segmentation allows the terminal to reconstruct the complete configuration by combining the reference with the delta, reducing the amount of data that needs to be transmitted and stored.
2Adaptability or versatility
If full configuration is used during continuous CPAC, then terminal can perform cell addition/change, but terminal storage overhead is extremely high
Solution Approach 1:
The master node performs preliminary actions by determining the delta configuration before transmitting it to the terminal. The terminal stores the reference configuration in advance and combines it with the received delta configuration to obtain the complete SCG configuration, eliminating the need to store full configurations for multiple candidate cells.
Solution Approach 2:
Only the essential configuration differences are extracted and transmitted as delta configurations. The terminal uses the reference configuration (obtained previously) combined with these extracted differences to reconstruct the complete configuration, significantly reducing storage requirements while maintaining full cell addition/change capability.
3Reliability
If full configuration is used during CPAC, then terminal can access candidate cell, but user plane data interruption time increases
Solution Approach 1:
By extracting only the necessary configuration changes and transmitting them as delta configurations, the time spent on configuration transmission and processing is significantly reduced. This allows the terminal to faster transition between cells, minimizing user plane data interruption time while maintaining data transmission reliability.
Data Source
AI summary
. The present disclosure relates to cell configuration methods and devices. In one example method, a master node determines M candidate primary secondary cells, where M is a positive integer. The master node obtains first reference configuration information, and obtains RRC messages corresponding to N candidate primary secondary cells, where N is a positive integer, the N candidate primary secondary cells are included in the M candidate primary secondary cells, an RRC message of a first candidate primary secondary cell in the N candidate primary secondary cells includes SCG configuration information of the first candidate primary secondary cell, and the SCG configuration information of the first candidate primary secondary cell is a delta configuration based on the first reference configuration information. The master node delivers, to a terminal, second reference configuration information and the RRC messages corresponding to the N candidate primary secondary cells.