Sidelink Positioning Reference Signals With Autonomous Resource Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the location of terminals, especially when they are out of coverage of a base station, and there is a need for efficient congestion control during positioning operations.
Innovation Solution
The method involves using sidelink (SL) positioning signals, including SL PRS, to measure terminal locations, and implementing congestion control mechanisms to prevent signal collisions during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sidelink positioning reference signals are transmitted without congestion control, then positioning coverage is extended to areas outside base station coverage, but signal collisions occur which deteriorate positioning accuracy
Solution Approach 1:
The patent applies preliminary action by performing sensing and resource selection before transmitting positioning reference signals. The terminal identifies available resources in a resource pool through sensing operations, selects appropriate transmission resources based on the sensed conditions, and then transmits the signals. This advance preparation prevents signal collisions by ensuring that transmission resources are chosen based on current channel conditions and other terminal activities, thereby maintaining positioning accuracy while enabling coverage outside base station range.
2Measurement precision
If congestion control mechanisms are implemented for positioning signals, then signal collision is reduced improving positioning accuracy, but system complexity increases
Solution Approach 1:
The patent implements self-service through autonomous sensing and resource selection performed by each terminal independently. Each terminal autonomously senses the channel conditions, identifies suitable resources from the resource pool, and selects transmission resources without requiring complex centralized control or coordination with other terminals. This self-service approach reduces signal collisions and improves positioning accuracy while avoiding the complexity of centralized resource management systems.
3Measurement precision
If resource pools are identified and transmission parameters are optimized, then positioning accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission parameters such as comb size and number of symbols based on measured channel conditions and positioning accuracy requirements. The terminal senses the channel environment, evaluates different parameter configurations, and selects optimal parameters that achieve the required positioning accuracy while minimizing resource consumption. This adaptive parameter adjustment improves positioning accuracy without incurring excessive transmission overhead.
Data Source
AI summary
A method performed by a terminal in a wireless communication system is provided. The method includes obtaining information on transmission parameters associated with a SL positioning reference signal, identifying a resource pool associated with the SL positioning reference signal, performing a measurement based on the resource pool associated with the SL positioning reference signal, and determining at least one transmission parameter associated with the SL positioning reference signal based on the measurement and the information on the transmission parameters. The transmission parameters include at least one of a comb size associated with the SL positioning reference signal or a number of symbols for the SL positioning reference signal in a slot.