Sidelink Positioning Reference Signal Resource Conflict Avoidance
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Solution Overview
Problem
Existing positioning technologies face challenges in managing conflicting resource configurations for positioning reference signals, particularly in sidelink positioning scenarios where multiple target UEs may independently configure anchor UEs with incompatible time, frequency, and/or code parameter settings.
Innovation Solution
The proposed solution involves a double-handshake procedure between target UEs and anchor UEs to ensure conflict-free sidelink positioning reference signal (S-PRS) resource selection. This includes a first message indicating a set of preferred and/or non-preferred resource configurations, followed by a second message from the anchor UE providing conditional S-PRS resource configurations, and finally a third message confirming the selected resource configuration for S-PRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple target UEs independently configure anchor UEs with preferred resource configurations, then positioning sessions can be established quickly, but resource conflicts occur with packet collisions and strong interference
Solution Approach 1:
The anchor UE performs preliminary actions by receiving and processing multiple first messages containing preferred resource configurations from different target UEs before finalizing the resource allocation. This allows the anchor UE to evaluate potential conflicts in advance and prepare appropriate responses, preventing packet collisions and strong interference before they occur during actual positioning signal transmission.
Solution Approach 2:
The system implements feedback mechanisms where the anchor UE sends second messages containing conditional S-PRS resource configurations back to target UEs, and receives third messages confirming the selected resource configuration. This multi-step feedback loop ensures that resource conflicts are resolved through iterative communication, maintaining reliability while enabling quick setup.
2Ease of operation
If anchor UEs use a simple resource allocation method, then the procedure is easy to implement, but conflicting resource configurations cannot be resolved
Solution Approach 1:
The resource allocation procedure is segmented into distinct phases: receiving first messages with preferred configurations, generating and transmitting second messages with conditional configurations, and receiving third messages with final selections. This segmentation allows each phase to be handled simply while collectively achieving conflict-free resource selection through structured interaction between anchor and target UEs.
3Productivity
If target UEs independently select resource configurations without coordination, then setup speed is fast, but time, frequency, and code parameter conflicts arise
Solution Approach 1:
The anchor UE acts as an intermediary between multiple target UEs, receiving their independent preferred resource configurations, processing for conflicts, and coordinating the final resource allocation. This intermediary role allows target UEs to maintain independent selection speed while the anchor UE mediates to eliminate harmful time, frequency, and code parameter conflicts through conditional configurations and confirmations.
Data Source
AI summary
Disclosed is a method comprising receiving, by a first terminal device, from a second terminal device, a first message indicating a first set of resource configurations for transmission of a reference signal to the second terminal device: transmitting, by the first terminal device, a second message indicating a second set of resource configurations for the transmission of the reference signal to the second terminal device, wherein the second set of resource configurations are generated based at least partly on the first set of resource configurations; receiving, by the first terminal device, from the second terminal device, a third message indicating a resource configuration to be used for the transmission of the reference signal to the second terminal device; and transmitting, by the first terminal device, to the second terminal device, the reference signal based at least partly on the resource configuration indicated in the third message.