Uplink Timing Advance Determination for High-Speed Wireless Communication
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Solution Overview
Problem
In high-speed mobile scenarios, especially in millimeter-wave bands, the propagation delay differences between signals from adjacent RRHs can be significant, exceeding the cyclic prefix lengths of OFDM symbols, which complicates the process of Active TCI state Switching and can lead to failures in timing acquisition and resource wastage.
Innovation Solution
The proposed method involves a user equipment (UE) receiving uplink timing advance (TA) related information from a network-side entity, determining the TA based on received information and downlink timing information, and transmitting an uplink signal accordingly. This method allows the UE to perform uplink timing adjustments without requiring updates to the UE's TA value, thereby enhancing system performance in high-speed scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE updates its TA value based on downlink timing changes from adjacent RRHs, then the uplink timing synchronization is maintained, but the signaling overhead increases and resource wastage occurs
Solution Approach 1:
The patent extracts the TA update mechanism only for specific scenarios (inter-RRH switching with significant propagation delay differences) rather than applying it universally. The network determines whether TA update is needed based on downlink timing information, and only then requests TA update from the UE, thereby eliminating unnecessary signaling overhead while maintaining timing synchronization when required.
Solution Approach 2:
The network-side entity monitors downlink timing information from adjacent RRHs and provides feedback to the UE only when timing adjustments are necessary. This feedback mechanism allows the system to maintain uplink timing synchronization while minimizing signaling overhead by activating TA updates only under specific conditions rather than continuously.
2Measurement precision
If the UE performs Active TCI state Switching in high-speed scenarios, then the beam tracking accuracy is improved, but the timing acquisition may fail due to propagation delay differences exceeding cyclic prefix lengths
Solution Approach 1:
The network-side entity performs preliminary assessment of downlink timing information from adjacent RRHs before triggering Active TCI state Switching. By evaluating propagation delay differences in advance, the network can determine whether timing adjustment is needed and prepare appropriate TA values, thereby preventing timing acquisition failures that would otherwise occur when switching between RRHs with significant delay differences.
Solution Approach 2:
The network-side entity acts as an intermediary between the UE and the TCI state switching process. It monitors downlink timing information, determines whether propagation delay differences exceed cyclic prefix lengths, and coordinates TA updates with TCI state switching. This intermediary role ensures that beam tracking accuracy is maintained while preventing timing acquisition failures through proactive timing management.
3Manufacturing precision
If the network requests frequent TA updates from the UE, then the uplink timing accuracy is maintained, but the resource wastage and processing complexity increase
Solution Approach 1:
Instead of requesting continuous TA updates, the network performs partial updates only when necessary based on downlink timing information from adjacent RRHs. The network evaluates whether propagation delay differences warrant a TA update and requests updates only in those specific cases, thereby maintaining uplink timing accuracy while reducing processing complexity and resource wastage associated with frequent unnecessary updates.
Data Source
AI summary
The present disclosure discloses a method and device in a wireless communication system. A method performed by a user equipment (UE) in a wireless communication system, comprising: receiving, by the UE, uplink timing advance (TA) related information from a network-side entity; determining uplink timing advance (TA), by the UE, based on the received uplink timing advance (TA) related information, and downlink timing related information, wherein the downlink timing related information comprises a current downlink timing T1 of the UE and a downlink timing T2 obtained by the UE based on a received specific downlink reference signal; and transmitting an uplink signal to the network-side entity based on the determined TA.