Positioning Reference Signal Transmission for V2X Sidelink
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Solution Overview
Problem
In NR V2X systems, vehicles face challenges in positioning due to mobility, making it difficult to find shared crystal oscillation, radio frequency, and center frequency for three-point positioning, especially in scenarios with limited network coverage like tunnels.
Innovation Solution
A method where a communication node transmits positioning reference signals from different geographical positions, associating measurements with moving distances and directions, using the same radio frequency unit, to enable precise positioning even in areas with limited network coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-point positioning is used in V2X systems, then positioning precision is improved, but device complexity increases due to mobility challenges and difficulty in finding shared crystal oscillation and radio frequency resources
Solution Approach 1:
The patent uses positioning reference signals as copies of known signal patterns transmitted from multiple nodes. These reference signals contain embedded positioning information that can be measured without requiring complex real-time calculations, thereby achieving precise positioning while reducing device complexity
Solution Approach 2:
The patent introduces positioning reference signals as an intermediary carrier that transports positioning information between transmitting and receiving nodes. This intermediary mechanism simplifies the positioning process by providing measurable signal characteristics rather than requiring direct measurement of complex mobility parameters
2Area of stationary object
If positioning reference signals are transmitted from multiple geographical positions, then positioning coverage is improved, but use of energy increases due to multiple transmissions
Solution Approach 1:
The positioning reference signals serve multiple functions simultaneously: they enable positioning measurements, provides channel quality information, and facilitate synchronization. This multi-functionality allows the same signal transmissions to achieve positioning coverage expansion without proportionally increasing energy consumption
3Measurement precision
If real-time positioning measurements are performed in mobile scenarios, then positioning accuracy is improved, but loss of time increases due to difficulty in finding shared resources
Solution Approach 1:
The patent performs preliminary actions by pre-configuring positioning reference signal resources and parameters before actual positioning measurements. The transmitting nodes prepare and transmit reference signals with embedded positioning information in advance, allowing receiving nodes to perform measurements without time-consuming resource search and coordination
Data Source
AI summary
Method and device in a node used for wireless communications. A first node receives first configuration information; transmits a first positioning reference signal on a first time-frequency resource block, transmits a second positioning reference signal on a second time-frequency resource block, and transmits a first information set; the first configuration information is used for indicating a first reference set, and any two time-frequency resource blocks in the first resource set employ a same positioning-related parameter; the first time-frequency resource block is earlier than the second time-frequency resource block in time domain; the first information set comprises a first distance, and the first distance refers to a distance from a first geographical position and a second geographical position, wherein the first geographical position is where the first node is located when transmitting the first positioning reference signal. The present disclosure provides an effective solution to the issue of sidelink positioning.