Multiple Timing Advance Design for TRP Uplink
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Solution Overview
Problem
Wireless communication systems face challenges in managing multiple timing advances (TAs) for uplink transmissions from user equipment (UE) to multiple transmit receive points (TRPs), leading to potential collisions and inefficiencies due to differing propagation delays and channel conditions.
Innovation Solution
The system employs a method where a timing advance index (TA index) is communicated to the UE via radio resource control (RRC) signaling or sounding reference signal (SRS) resources, allowing the UE to determine and apply appropriate TAs for each TRP, and mitigates collisions by prioritizing TAs or using spatial multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single TA is used for uplink transmissions to multiple TRPs, then device complexity is reduced, but timing alignment precision deteriorates due to different propagation delays
Solution Approach 1:
The patent segments the single TA parameter into multiple TAs, where each TA corresponds to a specific TRP. This allows each TRP to have its own timing advance value, precisely compensating for different propagation delays while maintaining manageable complexity through structured configuration.
Solution Approach 2:
The patent applies local quality by assigning different TA values to different TRPs based on their specific propagation characteristics. Each TRP receives a locally optimized TA value tailored to its distance and channel conditions, rather than using a uniform TA for all TRPs.
2Manufacturing precision
If multiple TAs are configured for different TRPs, then timing alignment precision is improved, but device complexity increases due to TA management
Solution Approach 1:
The patent creates a unified TA configuration framework that handles multiple TAs through a single configuration mechanism. The network can configure multiple TAs using a universal procedure, and the UE manages all TAs through a common interface, making the system scalable and manageable despite supporting multiple TRPs.
Solution Approach 2:
The patent enables dynamic TA management where the network can update individual TAs independently based on changing channel conditions. The UE can dynamically select and apply appropriate TAs for different TRPs, allowing flexible adaptation without reconfiguring the entire system.
3Manufacturing precision
If multiple TAs are used for uplink transmissions, then timing alignment to multiple TRPs is improved, but collision probability increases between uplink signals
Solution Approach 1:
The patent applies preliminary action by configuring multiple TAs in advance, allowing the UE to pre-calculate and prepare appropriate timing adjustments for each TRP before transmissions occur. This proactive timing alignment prevents signal collisions by ensuring uplink signals from different TRPs arrive synchronized at their respective receivers.
Solution Approach 2:
The patent implements feedback mechanisms where the network monitors uplink reception quality and adjusts TA values accordingly. Based on feedback about timing alignment performance and collision detection, the network can refine TA configurations to minimize collisions while maintaining precise timing alignment.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some cases, multiple timing advances (TAs) may be configured for non-coherent joint transmission (NCJT) with respective transmit receive points (TRPs). For example, a NCJT mode may have multiple TAs semi-statically configured for the UE to follow for each TRP. In some cases, a TA index corresponding to a TA for a TRP may be added as a field to a sounding reference signal (SRS) resource definition (e.g., SRS resource configuration). Additionally or alternatively, the TA index may be determined from an SRS index transmitted by the TRP, where the TA index corresponds to a TA for uplink information in a physical uplink shared channel. Additionally or alternatively, the TA index may be included as a field in a physical uplink control channel (PUCCH) definition to indicate a TA for a corresponding PUCCH that the UE transmits to the TRP.