Sidelink PRS Control Signaling for Backward-Compatible Positioning
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Solution Overview
Problem
The existing SL frame structure is designed primarily for SL communications, failing to accommodate the special bandwidth and latency requirements of positioning signals, necessitating a solution that ensures backward compatibility while enabling accurate and timely measurements for sidelink positioning.
Innovation Solution
The proposed solution involves transmitting control information associated with sidelink positioning reference signals (SL PRS) using resources in Physical Sidelink Feedback Channel (PSFCH) symbols or dedicated symbols within the SL frame structure, allowing for flexible resource allocation and minimizing impact on legacy operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing SL frame structure is used for SL positioning, then backward compatibility is maintained, but the special bandwidth and latency requirements of positioning signals cannot be satisfied
Solution Approach 1:
The patent segments the SL frame structure by introducing dedicated positioning reference signal (PRS) resources and control information channels separate from legacy SL communication resources. This allows positioning-specific requirements (bandwidth, latency) to be met in dedicated resources while legacy communications continue in original resources, resolving the contradiction between backward compatibility and positioning accuracy.
Solution Approach 2:
The patent adds a new dimension to the SL frame structure by introducing new resource types (PRS resources, control information for PRS) alongside existing SL communication resources. This multi-dimensional resource allocation enables simultaneous support for legacy communications and positioning-specific requirements without compromising either.
2Stability of the object's composition
If the existing SL frame structure is used for SL positioning, then legacy operations are maintained, but bandwidth and latency requirements for accurate positioning measurements cannot be met
Solution Approach 1:
The patent segments time resources by allocating specific time slots and symbols for PRS transmission and control information, separate from legacy SL communication time resources. This time segmentation enables positioning measurements to occur with dedicated latency budgets while legacy communications maintain their established timing patterns.
Solution Approach 2:
The patent implements preliminary action by transmitting control information for SL PRS before the actual PRS transmission. This allows receiving devices to prepare measurement configurations and resource allocations in advance, reducing positioning latency while legacy operations proceed independently.
3Device complexity
If control information for SL PRS is transmitted using legacy SL resources, then resource allocation is simple, but resource waste and collision increase
Solution Approach 1:
The patent creates universal resource pools that can accommodate both legacy SL control information and new PRS-related control information. These multi-functional resource pools reduce resource waste by efficiently allocating resources based on actual needs while maintaining clear separation between legacy and positioning-specific transmissions to prevent collisions.
Data Source
AI summary
Example embodiments of the present disclosure relate to transmission of control information associated with sidelink positioning reference signal. In an example method, a first terminal device in a radio access network comprises at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the first terminal device to: transmit, to a second terminal device in the radio access network, control information associated with a sidelink (SL) positioning reference signal (PRS) during a SL positioning session for positioning of the second terminal device, using a resource for the control information in a Physical Sidelink Feedback Channel (PSFCH) symbol or in at least one symbol dedicated for the control information. In this way, the first terminal device can efficiently transmit control information to the second terminal device with backward compatibility.