Sidelink Resource Reservation for Positioning Accuracy
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently reserving sidelink resources for positioning reference signals (PRS) to minimize clock drift errors during sidelink positioning operations between devices, which affects the accuracy of multi-round-trip-time (RTT) positioning methods.
Innovation Solution
A method where a sidelink device reserves a first sidelink resource for its own PRS transmission and at least one further sidelink resource for another device's PRS transmission, with the additional resource occurring within a specific time threshold of the first resource to mitigate clock drift errors, allowing for precise positioning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sidelink resources are reserved for PRS transmission without considering time intervals, then resource allocation is simplified, but clock drift errors increase and positioning accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing specific time threshold parameters (first time threshold and second time threshold) to control the time intervals between PRS transmissions. By adjusting these time threshold parameters, the system optimizes the balance between resource allocation efficiency and positioning accuracy, resolving the contradiction between simplified resource allocation and reduced clock drift errors.
2Measurement precision
If multiple PRS transmissions are scheduled with large time intervals, then clock drift errors are reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the resource reservation flexible and adaptive. The system dynamically adjusts resource reservations based on measured clock drift and determined time thresholds, allowing the time intervals between PRS transmissions to be optimized for each specific scenario. This dynamic approach enables the system to achieve both reduced clock drift errors and improved resource utilization efficiency.
3Reliability
If a device reserves resources for both its own PRS and other devices' PRS, then positioning operations are enhanced, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the first sidelink device reserve resources for other devices' PRS transmissions in advance. By proactively reserving these resources and establishing time thresholds before positioning operations begin, the system enhances positioning reliability while managing device complexity through upfront resource planning rather than ad-hoc resource management.
Data Source
AI summary
In an aspect, a sidelink device may reserve a first sidelink resource for transmission of a first positioning reference signal (PRS) by the sidelink device. The sidelink device may reserve at least one further sidelink resource for transmission of at least one further PRS by at least one further sidelink device, wherein the at least one further sidelink resource occurs within a first time threshold of the first sidelink resource.