Sidelink Positioning Reference Signal Resource Determination
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in performing positioning procedures when user equipment (UE) devices are out of network coverage, as they lack the necessary resources to transmit and receive positioning reference signals effectively for accurate location determination.
Innovation Solution
The method involves an assisting UE and a target UE exchanging requests and determining sets of time and/or frequency resources over a sidelink to transmit positioning reference signals, allowing them to perform positioning procedures even when both are out of network coverage, by selecting resources based on deterministic functions such as subchannel indices, source IDs, destination IDs, or pseudo-random variables to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs perform positioning procedures out of network coverage, then positioning capability is improved, but resource coordination and collision avoidance become more complex
Solution Approach 1:
UEs autonomously determine positioning reference signal resources without network assistance by using deterministic functions based on their identities and subchannel indices. The UEs self-coordinate resource selection through predefined rules, eliminating the need for network-controlled resource allocation and enabling positioning in out-of-coverage scenarios.
Solution Approach 2:
The patent changes the resource allocation parameters from network-controlled to UE-autonomous determination. By using deterministic functions that map UE identities and subchannel indices to specific time-frequency resources, the system transforms the resource coordination mechanism to work independently of network coverage while maintaining structured resource distribution.
2Adaptability or versatility
If UEs autonomously select positioning reference signal resources, then network coverage dependency is reduced, but resource collisions may increase
Solution Approach 1:
The patent transforms resource selection from random autonomous choice to deterministic parameter-based allocation. By using functions that deterministically map UE identities and subchannel indices to specific resources, the system eliminates random collisions while maintaining network independence. The parameter transformation ensures that different UEs select different resources based on their unique characteristics.
Solution Approach 2:
Each UE selects resources based on its local identity parameters and the local subchannel index, creating a distributed resource allocation scheme. This local quality approach ensures that resource selection is tailored to each UE's specific context while following a unified deterministic rule, preventing collisions without requiring centralized coordination.
3Ease of manufacture
If positioning reference signals are transmitted without network coordination, then deployment flexibility is improved, but signal collision and interference increase
Solution Approach 1:
The patent changes the resource allocation from uncoordinated transmission to parameter-coordinated transmission. By using deterministic functions that incorporate UE identities and subchannel indices, the system transforms independent transmissions into coordinated resource usage, reducing signal collisions while maintaining deployment flexibility in out-of-coverage scenarios.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, an assisting user equipment (UE) receives a request to perform a positioning procedure from a target UE over a sidelink between the assisting UE and the target UE, wherein the assisting UE and the target UE are both out of network coverage, determines, based at least on the request, a set of time and/or frequency resources on which to transmit one or more positioning reference signals for the positioning procedure, and transmits the one or more positioning reference signals to the target UE via the set of time and/or frequency resources.