Sidelink positioning reference signal sending method and apparatus, and sidelink positioning reference signal receiving method and apparatus
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Solution Overview
Problem
The lack of base station scheduling in sidelink communication and the different physical layer channel structure from uplink and downlink prevent effective sidelink positioning reference signal transmission and reception.
Innovation Solution
A method for acquiring and configuring time-frequency resource parameters for sidelink positioning reference signals (SL PRS) to facilitate transmission and reception without base station involvement, using dedicated resource sets and indication information to ensure accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If base station scheduling is used for positioning reference signal transmission, then positioning accuracy is improved, but device complexity and system overhead increase
Solution Approach 1:
User equipment autonomously selects and transmits positioning reference signals on sidelink resources without base station scheduling. The transmitting UE independently determines resource allocation, signal parameters, and transmission timing, while the receiving UE independently measures and processes the signals for positioning calculations, eliminating the need for base station involvement in the positioning reference signal transmission process.
Solution Approach 2:
The positioning reference signal transmission function is extracted from the base station-controlled cellular network framework and transferred to the sidelink communication between user equipment. This separation allows positioning operations to occur independently on the sidelink, removing the dependency on base station scheduling while maintaining positioning functionality.
2Productivity
If sidelink positioning reference signal is transmitted without base station scheduling, then spectral efficiency is improved, but positioning reliability deteriorates due to lack of coordinated resource allocation
Solution Approach 1:
Resource pools for sidelink positioning reference signals are pre-configured with specific time-frequency resources, cyclic shifts, and signal parameters before actual positioning operations. This preliminary configuration ensures that when positioning is needed, user equipment can immediately transmit and receive signals on pre-allocated resources without coordination overhead, maintaining both spectral efficiency and reliability.
Solution Approach 2:
Multiple positioning reference signal configurations with different parameters (cyclic shifts, resource pool assignments, signal patterns) are pre-defined. User equipment can select and switch between different parameter sets based on channel conditions, interference levels, and positioning requirements, enabling adaptive transmission that maintains reliability while improving spectral efficiency.
Data Source
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AI summary
The present application provides methods and apparatus for transmitting and receiving a sidelink positioning reference signal, where the transmitting method applied to a first terminal includes: acquiring a time-frequency resource configuration parameter of the SL PRS; and determining a first resource, and transmitting, on the first resource, the SL PRS or the SL PRS and first indication information based on the time-frequency resource configuration parameter, where the first indication information is used to indicate transmission parameter information of the first resource. In embodiments of the present application, a time-frequency resource configuration parameter of an SL PRS is acquired, and the SL PRS is carried on a first resource for transmitting and receiving based on the time-frequency resource configuration parameter. In addition, the SL PRS may cooperate with first indication information, facilitating transmission of the SL PRS in a case in which no base station participates in scheduling and a physical layer channel structure form is different from those on an existing uplink and downlink, and also facilitating positioning of sidelink based on the SL PRS.