Dynamic Gap Symbol in Sidelink Positioning Reference Signal
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Solution Overview
Problem
Current 5G NR systems face inefficiencies in allocating sidelink positioning reference signal (SL PRS) resources due to the inflexibility of gap symbols, which can lead to resource wastage and hinder fast reception-transmission switching, especially in scenarios requiring precise latency and accuracy for SL positioning.
Innovation Solution
Implementing dynamic signaling of gap symbols using sidelink control information (SCI) to indicate whether a given SL PRS resource is followed by a gap symbol, allowing UEs to determine the time domain allocation and adjust accordingly, thereby optimizing resource utilization and enabling flexible Rx-Tx switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gap symbols are always configured for SL PRS transmission, then reception-transmission switching is supported, but resource utilization deteriorates due to unnecessary gap symbols
Solution Approach 1:
The patent applies dynamics by making the gap symbol configuration flexible rather than fixed. The network can dynamically indicate whether a gap symbol is present in each SL PRS transmission occasion through SCI signaling, allowing the system to adapt to different operational scenarios and optimize resource usage while maintaining Rx-Tx switching capability when needed.
2Loss of energy
If gap symbols are dynamically indicated per SL PRS resource, then resource utilization is improved, but device complexity increases due to dynamic signaling processing
Solution Approach 1:
The patent applies universality by using the existing SCI signaling mechanism for multiple purposes. The same SCI that carries SL PRS resource allocation information also indicates the presence or absence of gap symbols, allowing the system to maintain resource utilization benefits without adding separate dedicated signaling channels or complex processing infrastructure.
3Device complexity
If fixed time domain allocation is used for SL PRS, then device complexity is reduced, but adaptability deteriorates for different positioning scenarios
Solution Approach 1:
The patent applies parameter changes by allowing the time domain allocation parameters of SL PRS to be dynamically adjusted through network indication. The network can signal whether gap symbols are present, enabling the system to change the effective time domain structure of SL PRS transmissions based on specific positioning scenario requirements while keeping the underlying allocation mechanism relatively simple.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for dynamic gap symbol in sidelink positioning reference signal (SL PRS) resource configuration. A method may include receiving, from a user equipment, a sidelink control information indicating whether a gap symbol exists for a sidelink positioning reference signal transmission. The method may also include determining a time domain allocation of the sidelink positioning reference signal. The method may further include receiving, from the user equipment, a sidelink positioning reference signal with or without the gap symbol. In addition, the method may include performing a positioning computation based on the sidelink positioning reference signal received from the user equipment.