Sidelink Positioning Reference Signal Comb Offset Encoding
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in accurately conveying comb offsets for sidelink positioning reference signals (SL-PRS) between user equipment (UE), which affects the precision of sidelink positioning.
Innovation Solution
The method involves transmitting and receiving sidelink communication indications (SCI) that include comb offset information for SL-PRS, allowing UE to adjust their transmission and reception accordingly, thereby ensuring accurate sidelink positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If comb offset information is transmitted for SL-PRS, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter representation by encoding comb offset information as a difference value relative to a reference comb offset rather than transmitting absolute comb offset values. This parameter transformation reduces the number of bits required for signaling while maintaining positioning accuracy, as the difference between adjacent comb offsets is typically small and can be represented with fewer bits.
Solution Approach 2:
The patent establishes a reference comb offset that is predetermined or previously agreed upon between transmitting and receiving UEs. By pre-defining this reference value, the system eliminates the need to transmit it explicitly, reducing signaling overhead. The actual comb offset information is then conveyed as a deviation from this pre-established reference.
2Manufacturing precision
If comb offset indication is included in SCI, then SL-PRS transmission accuracy is improved, but message complexity increases
Solution Approach 1:
The patent transforms the comb offset parameter from an absolute value to a relative difference value. This change reduces the bit width required to represent the parameter, thereby simplifying the SCI message structure while maintaining the precision needed for accurate SL-PRS transmission and positioning calculations.
Solution Approach 2:
The patent applies differential encoding only where necessary - specifically for comb offset information that varies between transmissions. By using difference values locally rather than retransmitting full comb offset parameters, the message complexity is reduced in the specific area where variations occur, while maintaining accuracy where needed.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a first user equipment (UE) determines a comb offset for a sidelink positioning reference signal (SL-PRS), transmits an indication of the comb offset to a second UE, and transmits the SL-PRS in accordance with the comb offset. The second UE receives the SL-PRS in accordance with the comb offset.