TRP-Specific Timing Advance Indication for mTRP Uplink Alignment
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Solution Overview
Problem
Existing TA indication technologies in communications technologies can only adjust timing advance (TA) with a granularity of a TAG, which is insufficient for multi-transmission and reception point (mTRP) uplink transmission scenarios where multiple TRPs may use the same TA, leading to timing misalignments and performance issues.
Innovation Solution
A method where a network device transmits downlink signaling to a terminal device, indicating multiple timing advances (TAs), each corresponding to one TRP, allowing the terminal device to update and adjust TA values specifically for each TRP, ensuring proper timing alignment for uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing TA indication technology is used, then the system maintains simplicity in TA management, but timing alignment precision deteriorates in mTRP scenarios
Solution Approach 1:
The patent segments the TA management by introducing TRP-specific TA values for different transmission reception points. Instead of using a single TA value for the entire cell, the system now manages multiple TA values (e.g., TA1 for TRP1, TA2 for TRP2), allowing precise timing alignment for each TRP independently while maintaining overall system organization through structured signaling mechanisms.
Solution Approach 2:
The patent applies local quality by enabling different TA values for different TRPs within the same cell. Each TRP can have its own optimized TA value based on its specific propagation conditions and geometric relationship with the terminal device, rather than forcing a uniform TA value across all TRPs. This local optimization improves timing alignment precision for each TRP-specific transmission.
2Reliability
If multiple TRPs use the same TA value, then the system maintains simplicity in signaling, but uplink transmission performance deteriorates due to timing misalignment
Solution Approach 1:
The patent segments the TA indication by providing separate TA values for different TRPs through dedicated fields in downlink signaling. The network device can indicate TRP-specific TA values using structured signaling formats that identify which TRP each TA value applies to, enabling reliable timing alignment for each TRP while organizing the signaling in a manageable way.
Solution Approach 2:
The patent changes the TA parameter from a single system-wide value to multiple TRP-specific values. By introducing TRP identifiers and corresponding TA values in the signaling, the system can dynamically adjust timing parameters for each TRP based on its specific conditions, thereby improving uplink transmission reliability without requiring complete redesign of the signaling framework.
Data Source
AI summary
Provided is a method for indicating a TA. The method is applicable to a terminal device, a serving cell of the terminal device comprising m transmission and reception points (TRPs), m being a positive integer greater than or equal to 1, and the method includes: receiving downlink signaling, wherein the downlink signaling indicates at least one TA, each of the at least one TA corresponding to one of the m TRPs; and updating the at least one TA based on the downlink signaling.