Multi-TAG Uplink Timing Control for Multi-TRP Communication
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Solution Overview
Problem
Existing communication systems face challenges in managing multiple Timing Advance Groups (TAGs) due to inconsistent UL timing across different transmission and reception points, particularly in multi-transmission and reception point operations, necessitating specific operations and configurations to maintain synchronization and performance.
Innovation Solution
The proposed solution involves configuring a terminal device with multiple TAGs, receiving and applying timing advance commands based on associated timers and start time points, and selecting a target TAG for communication procedures, ensuring consistent UL timing across multiple TAGs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TAGs are configured for a single serving cell to support UL multi-DCI and multi-TRP operations, then communication versatility and performance are improved, but device complexity and timing management difficulty increase
Solution Approach 1:
The patent segments the timing advance management by introducing separate timers (first timer and second timer) for different TAGs. Each timer independently tracks timing advance adjustments for its associated TAG, enabling parallel management of multiple timing groups without interference. This segmentation resolves the complexity by dividing the overall timing management function into independent sub-functions.
Solution Approach 2:
The patent implements dynamic timer management where timers can be started, stopped, and restarted based on communication conditions. The system dynamically selects which timer to use (first or second) based on the current TAG state and communication procedure requirements. This dynamic approach allows flexible adaptation to varying operational scenarios while maintaining clear timing control.
2Reliability
If timer-based timing advance management is implemented for multiple TAGs, then timing synchronization reliability is improved, but processing overhead and time consumption increase
Solution Approach 1:
The patent implements preliminary timer configuration where timers are pre-configured with appropriate durations and thresholds before communication procedures begin. The first timer and second timer are set up with predetermined values that enable timely detection of timing advance changes without requiring complex real-time calculations. This preliminary preparation reduces processing overhead during actual communication operations.
Solution Approach 2:
The system uses timer-based feedback mechanisms to monitor timing advance status and trigger appropriate actions when thresholds are crossed. The timers provide periodic feedback about timing conditions, enabling the system to respond to timing changes without continuous complex processing. This feedback approach balances reliability with processing efficiency by using simple temporal signals rather than continuous analysis.
Data Source
AI summary
Example embodiments of the present disclosure relate to a solution for communications with multiple Timing Advance Groups (TAGs). In this solution, a terminal device receives, from a network device, configuration information indicating a plurality of timing advance groups (TAGs) associated with a first cell of the terminal device. The terminal device determines, during a communication procedure with the network device, at least one running state of at least one timer among a plurality of timers associated with the plurality of TAGs; and performs an action for the communication procedure based on the at least one running state of the at least one timer.