Sub-TAG Based Timing Advance Management for Multi-TRP Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining Timing Advance (TA) for each Transmit/Receive Point (TRP) in MIMO scenarios, leading to difficulties in adjusting uplink TA, resulting in delayed transmissions and resource wastage.
Innovation Solution
A method is introduced where a first signaling is used to indicate a TA, determining the uplink transmission timing and starting a timer to check alignment, with specific action sets executed based on the number of resource groups in a cell, allowing independent TA maintenance for each TRP, thereby reducing delays and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single timeAlignmentTimer is used for all cells in a TAG, then the TA maintenance mechanism is simple, but it cannot independently adjust TA for each TRP, causing uplink misalignment
Solution Approach 1:
The patent divides the TAG into multiple sub-TAGs, each associated with a specific TRP and having its own timeAlignmentTimer. This segmentation allows independent TA maintenance for each TRP while keeping the overall structure organized and manageable, resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The patent applies different TA maintenance mechanisms to different parts of the system: sub-TAGs with single TRP use simple timer-based maintenance, while TRPs requiring independent control have dedicated sub-TAGs. This local differentiation optimizes both simplicity where possible and accuracy where needed.
2Reliability
If TA is adjusted for one TRP, then that TRP achieves proper alignment, but other TRPs may become out-of-step due to shared timer
Solution Approach 1:
By segmenting the TAG into sub-TAGs with dedicated timeAlignmentTimers for each TRP, the patent enables independent TA adjustment without affecting other TRPs. This eliminates the trade-off between alignment accuracy and transmission efficiency, as each TRP can be optimized independently.
3Adaptability or versatility
If existing TAG mechanism is used for multi-TRP, then standard compatibility is maintained, but independent TA control for each TRP is lost
Solution Approach 1:
The patent nests sub-TAGs within the existing TAG structure, where each sub-TAG is further divided into resource groups. This nested structure maintains compatibility with existing TAG-based protocols while enabling fine-grained independent control of TA for each TRP through the sub-TAG level.
Data Source
AI summary
The present application provides a method and a device in a communication node for wireless communications. A communication node receives a first signaling which is used to determine a first TA, starts or restarts a first timer which is used to determine whether an uplink of the first resource group is aligned; receives a second signaling which is used to determine a second TA, starts or restarts a second timer which is used to determine whether an uplink of a second resource group is aligned; when the first timer expires, determines whether to execute a first action set or a second action set according to the second timer; the first action set is related to both the first resource group and the second resource group; the second action set is related to the first resource group, and the second action set is unrelated to the second resource group.