Positioning SRS Scheduling With First-Available Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring timely transmission of Sounding Reference Signals (SRS) for positioning due to collisions with priority messages or other transmission constraints, leading to incomplete or missed positioning measurements.
Innovation Solution
Implementing a method where user equipment (UE) receives a schedule with multiple reserved occasions for SRS transmission and transmits the positioning SRS on the first available occasion, avoiding earlier or subsequent unavailable occasions, allowing the base station to decode the SRS and reassigned unused occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits positioning SRS on the scheduled occasion, then positioning measurements can be obtained, but transmission collisions with priority messages or other constraints may prevent timely transmission
Solution Approach 1:
The base station provides the UE with multiple reserved occasions for SRS transmission in advance, allowing the UE to prepare and select the appropriate occasion. The UE is configured to transmit on the first available occasion among the reserved ones, ensuring positioning SRS can be sent even when the original scheduled time is blocked by higher priority messages or other transmission constraints.
2Adaptability or versatility
If multiple reserved occasions are provided for SRS transmission, then transmission availability is improved, but the complexity of scheduling and decoding increases
Solution Approach 1:
The scheduling mechanism divides the transmission opportunity into multiple segmented reserved occasions rather than providing a single fixed time slot. Each occasion is independently defined with specific time characteristics, allowing the UE to segment the transmission requirement into multiple potential opportunities. The UE then selects the first available segment, simplifying the overall scheduling complexity while maintaining high transmission availability.
3Measurement precision
If the base station attempts to decode SRS on all reserved occasions, then measurement completeness is improved, but processing time and resources increase
Solution Approach 1:
The base station receives feedback from the UE about which reserved occasion was used for SRS transmission. Based on this feedback, the base station knows exactly which occasion contains the positioning SRS and can focus decoding resources on that specific occasion rather than attempting to decode all reserved occasions. This feedback mechanism ensures measurement completeness while significantly reducing processing time and computational resources required.
Data Source
AI summary
A user equipment (UE) receives scheduling information for Sounding Reference Signal (SRS) for positioning that includes multiple reserved occasions to transmit the SRS. The multiple reserved occasions may be used on all or on only a subset of configured SRS resources. The UE transmits the positioning SRS on a reserved occasion that is first available for transmission, e.g., without collision or other restrictions of transmission of the SRS. The UE does not transmit the positioning SRS on any earlier reserved occasions that is not available or any subsequent reserved occasions. The base station may attempt to decode the SRS on each reserved occasion until the positioning SRS is transmitted. The base station may reassign unused reserved occasions to other UEs or to other channels. The base station may report positioning measurements with associated time stamps for the reserved occasion on which the positioning SRS was received.