Wireless Transmit/Receive Unit Propagation Delay Compensation
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately compensating for propagation delays, which affect the synchronization and reliability of time-sensitive communications, especially in scenarios like control-to-control and smart-grid applications where precise timing is critical.
Innovation Solution
A Wireless Transmit/Receive Unit (WTRU) is configured to perform Propagation Delay (PD) procedures, including Propagation Delay Information Exchange (PDIE) and Propagation Delay Compensation (PDC), by determining propagation delays based on received and transmitted reference signals and Rx-Tx time differences, and applying compensation to ensure accurate timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If propagation delay compensation is performed using traditional methods, then timing alignment is improved, but synchronization accuracy deteriorates in time-sensitive networks
Solution Approach 1:
The patent segments the propagation delay measurement into multiple reference signal pairs (DL RS and UL RS) for different paths, allowing separate measurement and compensation of propagation delays for each path. This segmentation enables more precise synchronization by treating each transmission path independently rather than using a single aggregated delay value.
Solution Approach 2:
The patent implements a feedback mechanism where the WTRU measures propagation delay using reference signal pairs, reports the measured delay to the network, and the network uses this feedback to adjust timing alignment commands. This closed-loop feedback system continuously refines synchronization accuracy based on actual measured propagation delays.
2Measurement precision
If multiple reference signal pairs are used for propagation delay measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by configuring different reference signal pairs for different paths (e.g., different TRPs, cells, or beams) based on their specific propagation characteristics. Each path receives tailored measurement resources appropriate to its local conditions, improving measurement precision without uniformly increasing complexity across all paths.
Solution Approach 2:
The patent implements partial action by activating propagation delay measurement and compensation only for specific paths that require it (e.g., paths with significant propagation delay or time-sensitive services), rather than applying the complex measurement procedure to all paths uniformly. This selective approach reduces overall device complexity while maintaining precision where needed.
3Reliability
If propagation delay compensation is applied to all uplink transmissions, then synchronization is improved, but loss of time increases due to additional processing
Solution Approach 1:
The patent performs propagation delay measurement and calculation in advance using configured reference signal pairs before actual uplink transmissions occur. The measured propagation delay values are stored and applied to subsequent uplink transmissions, eliminating the need for real-time calculation during transmission and reducing processing time loss.
Solution Approach 2:
The patent changes the parameter application strategy by determining propagation delay compensation applicability based on transmission type, path characteristics, and service requirements. Compensation parameters are selectively applied only when beneficial (e.g., for time-sensitive services or paths with significant delay), avoiding unnecessary processing for transmissions that don't require compensation.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for performing propagation delay compensation. For example, a Wireless Transmit/Receive Unit (WTRU) may be configured with the resources and signals to perform a Propagation Delay (RD) procedure, or a Propagation Delay Information Exchange (PDIE), or a Propagation Delay Compensation (PDC). The WTRU may receive configuration that may identify a reference signal (RS) pair for a path. The WTRU may determine that a trigger condition is satisfied for a path. The trigger condition being satisfied may trigger the WTRU to perform a PDIE. The WTRU may determine a propagation delay (RD) for a path. If the determined RD meets a threshold for the path, the WTRU may apply a PDC to an uplink (UL) transmission that uses the path.