Uplink Timing Group Configuration for Multi-CC Synchronization
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving synchronization across multiple component carriers (CCs), leading to inefficiencies and poor quality of service due to differing timing advance values and propagation delays, especially in uplink transmissions.
Innovation Solution
A method and apparatus for transmitting random access preambles (RAPs) and timing advance (TA) values across multiple CCs, allowing for configuration of uplink timing groups and selective transmission based on triggering conditions, enabling synchronized communication by determining appropriate RAP and TA schemes for updating and reorganizing UL timing groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple component carriers (CCs) are used to satisfy user demand, then system capacity and user service quality are improved, but synchronization difficulty and timing alignment complexity increase
Solution Approach 1:
The patent segments CCs into different UL timing groups based on their timing advance characteristics. CCs with similar propagation delays are grouped together, allowing independent timing management for each group. This segmentation reduces overall synchronization complexity by dividing the multi-CC system into manageable groups that can be handled separately.
Solution Approach 2:
The patent applies local quality by configuring different UL timing group configurations for different CCs based on their specific propagation delay characteristics. Each CC or group of CCs receives customized timing group configuration tailored to its local propagation conditions, rather than applying a uniform configuration across all CCs.
2Reliability
If UL timing group configuration is implemented for multiple CCs, then timing alignment is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent merges the timing group configuration information into existing RRC signaling messages such as RRCConnectionReconfiguration. By combining multiple configuration elements into unified signaling structures, the patent reduces redundant signaling overhead while maintaining comprehensive timing alignment control for multiple CCs.
Solution Approach 2:
The patent creates a universal UL timing group configuration framework that can accommodate different CC scenarios (single CC, multiple CCs, carrier aggregation) through a standardized configuration structure. This multi-functional approach allows the same signaling mechanism to handle various deployment scenarios without requiring separate specialized signaling for each case.
3Measurement precision
If RAP transmission is performed for all CCs or delegate UL CCs, then synchronization accuracy is improved, but transmission resource consumption increases
Solution Approach 1:
The patent extracts the timing advance update function to a delegate UL CC within each timing group. Instead of requiring RAP transmission on all CCs, the system designates one representative CC (delegate) per timing group to perform RAP transmission and TA update. This extraction significantly reduces the number of RAP transmissions required while maintaining synchronization accuracy through the delegate's representative updates.
Solution Approach 2:
The patent implements self-service by allowing the delegate UL CC to autonomously perform RAP transmission and TA measurement functions for its entire timing group. The delegate CC serves itself and other CCs in its group without requiring individual RAP transmissions from each CC, reducing overall system resource consumption while maintaining synchronization precision.
Data Source
AI summary
The present invention relates to a method and apparatus for performing random access in a wireless communication system. According to one embodiment of the present invention, the method comprises acquiring a time adjustment value for acquiring uplink timing via the representative CC in an uplink timing group which is set up by a predetermined condition; and updating the time adjustment value for the relevant uplink timing group by using the acquired time adjustment value.