Sidelink Reference Signal Power Matching for PSCCH Resource Selection
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Solution Overview
Problem
Current sidelink positioning in wireless communication systems lacks a power control mechanism for reference signals, leading to potential strong interference when the Received Signal Strength Indication (RSRP) of the Physical Sidelink Control Channel (PSCCH) is below a threshold, despite the reference signal having high RSRP, affecting resource selection by other terminal devices.
Innovation Solution
A method to determine power values for reference signals and PSCCH based on the comb value and resource quantity, ensuring the average power values of both are equal, allowing the RSRP of PSCCH to reflect the RSRP of the reference signal accurately, guiding proper resource selection by other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal device performs resource selection based on the RSRP of the PSCCH, then the resource selection process is simple, but the RSRP of the reference signal may be large causing strong interference
Solution Approach 1:
The patent introduces the RSRP of PSCCH as an intermediary indicator to indirectly reflect the RSRP of the reference signal. By establishing a correlation between PSCCH RSRP and reference signal RSRP through power control mechanisms, the system uses PSCCH measurement as a proxy to predict reference signal interference levels, avoiding the need for direct reference signal measurement while still identifying interfering resources
Solution Approach 2:
The patent changes the measurement parameter from reference signal RSRP to PSCCH RSRP. By adjusting which signal's power is measured and used for resource selection, the system maintains operational simplicity while gaining accurate interference prediction capability through the established power correlation between PSCCH and reference signal
2Device complexity
If no power control mechanism is defined for reference signals, then the system complexity is low, but the resource selection accuracy deteriorates
Solution Approach 1:
The patent makes the PSCCH serve multiple functions: it acts as both a control channel for transmitting scheduling information and as a reference signal for resource selection measurements. By establishing that PSCCH power control is correlated with reference signal power control, the system reuses existing PSCCH infrastructure and measurement mechanisms to achieve reference signal interference assessment without adding separate power control complexity
Solution Approach 2:
The system uses the PSCCH's own transmitted power characteristics to provide information about reference signal interference. The PSCCH effectively 'self-services' by its power level indicating the interference environment for resource selection, eliminating the need for separate reference signal power control mechanisms while maintaining accurate resource selection
Data Source
Figure 1(a)~1(c)
Figure 2~3A
Figure 3B
AI summary
A communication method and apparatus, a storage medium, and a chip system are provided, to provide a power control manner of a reference signal. In this application, a first terminal apparatus obtains a first parameter, where the first parameter includes at least a comb value of the reference signal. The first terminal apparatus determines a first power value, and determines a second power value based on the first parameter and the first power value; or the first terminal apparatus determines a second power value, and determines a first power value based on the first parameter and the second power value. The first terminal apparatus sends the reference signal based on the first power value, and sends a PSCCH based on the second power value. Because the first power value or the second power value is determined based on the comb value of the reference signal, an average power value of the reference signal on one RE is close to or equal to an average power value of the PSCCH on one RE, so that another terminal device can select a more proper resource based on an RSRP of the PSCCH.