Terminal Random Access Timing for Invalid TA and Pending SR
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Solution Overview
Problem
In communication systems, when a scheduling request (SR) remains pending due to an invalid timing advance (TA) value, the terminal device's behavior is unclear, leading to unnecessary waiting and communication delays.
Innovation Solution
The terminal device initiates a random access procedure at or before the time when the TA value becomes invalid, within a designated time window where the network device does not receive uplink signals, to avoid unnecessary waiting and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device waits for TA value update before initiating random access, then the SR configuration is retained, but the data transmission latency increases due to unnecessary waiting
Solution Approach 1:
The terminal device initiates the random access procedure at or before the first time when the TA value becomes invalid, rather than waiting until after the time window. This preliminary action eliminates unnecessary waiting time while ensuring the SR configuration is properly handled, thereby reducing data transmission latency without compromising reliability
2Productivity
If the terminal device initiates random access after the first time window, then the SR counter can continue counting, but the communication efficiency decreases due to extended waiting period
Solution Approach 1:
By triggering the random access procedure at or before the first time when TA becomes invalid, the terminal device performs the necessary action in advance. This allows the SR counter to continue counting without interruption while eliminating the extended waiting period that would occur if random access were initiated after the time window, thus maintaining productivity while reducing time loss
Data Source
AI summary
A method for communication and a terminal device are provided. One example method includes: triggering a random access procedure at or before a first time when a timing advance (TA) value becomes invalid, when the first time is within a first time window and a scheduling request (SR) in a pending state exists, wherein the first time window is a time window during which a network device does not receive uplink signals.