SL-PRS Resource Selection Aligned With Sidelink DRX Active Time
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Solution Overview
Problem
Existing sidelink communication systems in 5G networks face inefficiencies in resource allocation for sidelink positioning reference signals (SL-PRS) due to the lack of optimization with sidelink discontinuous reception (SL-DRX) configurations, leading to suboptimal resource utilization and increased latency in positioning sessions.
Innovation Solution
The method involves selecting initial resources for SL-PRS transmission based on the SL-DRX active time of UEs engaged in a positioning session, optimizing resource allocation within the SL-DRX active time to enhance efficiency and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL-PRS transmission resources are selected without considering SL-DRX active time, then resource allocation is simpler, but resource utilization efficiency deteriorates and latency increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the SL-DRX active time periods for all UEs in the positioning session before selecting SL-PRS transmission resources. The gNB identifies the active time of each UE based on their SL-DRX configurations, and then selects resources that fall within these predetermined active periods, ensuring efficient resource utilization without requiring complex real-time adjustments during transmission
Solution Approach 2:
The patent implements dynamics by making the SL-PRS resource selection adaptive to the dynamic SL-DRX active time patterns of different UEs. Instead of using fixed resource allocation, the system dynamically adjusts resource selection based on when each UE is actually active and able to receive signals, optimizing resource utilization according to varying operational conditions
2Loss of time
If SL-PRS transmission is performed outside SL-DRX active time, then transmission continuity is improved, but positioning latency increases
Solution Approach 1:
The patent applies periodic action by scheduling SL-PRS transmissions to occur during the periodic SL-DRX active time windows of the UEs. Instead of continuous transmission, the system transmits SL-PRS signals at regular intervals that coincide with when UEs are awake and monitoring, reducing overall transmission duration while maintaining positioning accuracy and minimizing latency
3Productivity
If SL-PRS resources are allocated without SL-DRX optimization, then system complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements feedback by having the gNB monitor and determine the SL-DRX active time of each UE based on their configurations, and then use this feedback information to optimize SL-PRS resource selection. The system continuously adapts resource allocation based on the feedback from UE DRX patterns, improving resource utilization efficiency while managing complexity through systematic feedback-driven adjustments
Data Source
AI summary
Disclosed are techniques for sidelink communication. In an aspect, a user equipment (UE) selects one or more initial resources for transmission of a sidelink positioning reference signal (SL-PRS) to a plurality of UEs engaged in a positioning session with the UE, wherein the one or more initial resources are selected based on the one or more initial resources being scheduled within sidelink discontinuous reception (SL-DRX) active time of at least a set of UEs of the plurality of UEs, and transmits the SL-PRS to at least the set of UEs.