Timing Advance Validation for Secondary Cell Activation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the activation of secondary cells (SCells) can lead to increased latency and throughput loss due to the need for random access procedures to acquire or re-acquire a valid timing advance (TA) value.
Innovation Solution
The described techniques involve validating a TA value determined prior to SCell de-activation by comparing signal quality metrics before and after SCell activation, allowing the TA value to be reused if the difference in signal quality metrics is within a specified threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access procedures are performed to acquire or re-acquire TA value for SCell activation, then timing advance validity is ensured, but latency increases and throughput is lost
Solution Approach 1:
The UE performs preliminary TA value determination and signal quality metric measurement before SCell de-activation. When the SCell is re-activated, if the signal quality difference is within the threshold, the previously determined TA value is validated and can be reused immediately, avoiding the need for random access procedures and reducing activation latency.
Solution Approach 2:
The system uses signal quality metrics as feedback to determine TA value validity. The UE compares the first signal quality metric (obtained before de-activation) with the second signal quality metric (obtained after re-activation), and based on this feedback comparison against a threshold, decides whether the TA value remains valid, enabling intelligent reuse without random access.
2Reliability
If random access procedures are performed for TA value acquisition upon SCell activation, then communication reliability is maintained, but throughput loss occurs
Solution Approach 1:
The UE performs preliminary TA value determination and signal quality metric measurement before SCell de-activation. When the SCell is re-activated, if the signal quality difference is within the threshold, the previously determined TA value is validated and can be reused immediately, avoiding the need for random access procedures and reducing activation latency.
Solution Approach 2:
The system uses signal quality metrics as feedback to determine TA value validity. The UE compares the first signal quality metric (obtained before de-activation) with the second signal quality metric (obtained after re-activation), and based on this feedback comparison against a threshold, decides whether the TA value remains valid, enabling intelligent reuse without random access.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein provide timing advance validation for secondary cell (SCell) activation. Prior to receiving a SCell de-activation message associated with a SCell, a user equipment (UE) may determine a TA value for uplink transmissions to the SCell, and the UE may determine a first signal quality metric associated with wireless communication between the UE and the SCell. The UE may receive the SCell de-activation message, and, at a later time, may receive a SCell activation message. The UE may determine whether the TA value determined prior to receipt of the SCell de-activation message is valid for the wireless communications between the UE and the SCell based on a difference between the first signal quality metric and a second signal quality metric determined after receipt of the SCell activation message.