Sidelink PRS Channel Access Through Shared COT Signaling
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Solution Overview
Problem
The issue of sharing Channel Occupancy Time (COT) among User Equipments (UEs) when sending Sidelink Positioning Reference Signals (SL PRS) on unlicensed spectrum is unresolved in existing wireless communication technologies.
Innovation Solution
A method and apparatus are provided where an Initiating User Equipment (IUE) sends indication information to a Responding UE (RUE) to access a channel and transmit a first Physical Sidelink Control Channel (PSCCH) and first SL PRS, allowing the RUE to share the COT with the IUE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs LBT on unlicensed spectrum before sending SL PRS, then channel access can be achieved, but channel access success rate and transmission efficiency are reduced due to channel contention and LBT failures
Solution Approach 1:
The IUE acts as an intermediary that performs LBT on behalf of multiple UEs and shares the acquired COT with them. Instead of each RUE performing independent LBT (which causes contention and failures), the IUE mediates channel access by successfully acquiring the channel and allowing multiple RUEs to transmit within the shared COT, thereby improving channel access success rate and reducing LBT-related time losses.
2Adaptability or versatility
If multiple UEs independently perform Type 1 LBT to access channel for SL PRS transmission, then each UE can independently access channel, but channel access efficiency and system productivity are reduced due to repeated LBT procedures
Solution Approach 1:
Multiple UEs merge their channel access efforts by allowing one IUE to perform LBT and acquire the COT on behalf of the group. Instead of each UE independently performing Type 1 LBT (which reduces productivity due to repeated procedures), the UEs combine their access attempts into a single LBT operation by the IUE, while maintaining the ability of each UE to transmit within the shared COT.
3Ease of operation
If RUE performs independent LBT and transmission on unlicensed spectrum, then RUE can autonomously access channel, but transmission efficiency and resource utilization are reduced due to channel contention
Solution Approach 1:
The IUE serves as an intermediary that handles channel access for multiple RUEs, improving transmission efficiency by eliminating repeated LBT procedures and channel contention. The RUEs maintain operational simplicity by receiving COT sharing indications from the IUE and transmitting within the allocated time window, thus preserving ease of operation while significantly improving productivity through reduced contention and more efficient resource utilization.
Data Source
AI summary
A sidelink positioning reference signal transmission method and apparatus, a device, and a medium are provided. The method is applied to a responding terminal, and includes: according to indication information from an initiating terminal, accessing a channel, and sending a first physical sidelink control channel PSCCH and a first sidelink positioning reference signal SL PRS.