Sidelink Control Signaling for Backward-Compatible Positioning
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Solution Overview
Problem
Current satellite-based positioning technologies struggle to provide precise location information indoors due to signal blocking, and outdoor precision is inadequate for applications like self-driving, while sidelink positioning technologies face compatibility issues with legacy systems.
Innovation Solution
A communication method that transmits sidelink control information and messages with specific formatting to support sidelink positioning, allowing legacy and new terminal apparatuses to decode and process information without errors, ensuring backward compatibility and enabling precise indoor positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new terminal apparatus sends a message by using a resource in the shared resource pool, then the message can be transmitted in the sidelink positioning scenario, but a legacy terminal apparatus also decodes the message and processes it in a legacy manner, which causes a decoding error
Solution Approach 1:
The message is segmented into two parts: first information (resource selection information) and second information (transmission mode information). Legacy terminal apparatuses only decode the first information, while new terminal apparatuses decode both parts. This segmentation allows backward compatibility while enabling new functionality.
Solution Approach 2:
The first information acts as an intermediary that both legacy and new terminal apparatuses can decode. It contains resource selection information that legacy devices need, while the second information (transmission mode information) serves as an additional layer that only new devices decode to identify positioning reference signals.
2Ease of operation
If a legacy terminal apparatus decodes all information in the sidelink control information, then it can process the message, but it increases the probability of decoding errors
Solution Approach 1:
Legacy terminal apparatuses perform partial decoding by only processing the first information (resource selection information) and ignoring the second information (transmission mode information). This partial action is sufficient for legacy devices to perform resource selection while avoiding decoding errors from attempting to process information formats they don't understand.
3Measurement precision
If satellite-based positioning is used, then location information can be obtained outdoors, but signal blocking prevents precise positioning indoors and outdoor precision is insufficient for applications like self-driving
Solution Approach 1:
The sidelink positioning reference signal serves multiple functions: it enables precise positioning both indoors and outdoors, and can be used by both new and legacy terminal apparatuses (with legacy devices using it for resource selection). This multi-functionality replaces the need for separate satellite-based positioning systems.
Data Source
AI summary
A communication method and apparatus are provided, to perform sidelink-based positioning. A first terminal apparatus determines sidelink control information. The sidelink control information includes first information used for resource selection and second information includes transmission mode information of a first message, and the transmission mode information of the first message indicates that the first message includes a sidelink positioning reference signal. The first terminal apparatus sends the sidelink control information and the first message. The sidelink positioning reference signal is used for sidelink positioning. In addition, because the sidelink control information includes the first information and the second information, a legacy terminal apparatus may perform resource selection based on the first information, and the legacy terminal apparatus determines, based on the transmission mode information of the first message, that the second information does not need to be decoded, thereby reducing a probability of a decoding error.