Sidelink Transmission Power Selection for NR V2X Pathloss Control
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Solution Overview
Problem
In NR sidelink communication, there is a challenge in determining the appropriate reference signal for downlink pathloss to set sidelink transmission power, which affects interference levels on uplink communication.
Innovation Solution
The method involves determining sidelink transmission power based on downlink pathloss using either a first reference signal associated with DCI format 0_0 for power control of physical uplink shared channel transmission or a second reference signal related to synchronization signal blocks for obtaining master information blocks, depending on configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a UE uses downlink pathloss for sidelink transmission power determination, then interference level on uplink communication is reduced, but the challenge arises in selecting the appropriate reference signal for pathloss calculation
Solution Approach 1:
The patent changes the parameter selection based on UE configuration state. Specifically, it uses different reference signals (CSI-RS for PUSCH power control when configured, otherwise SSB) depending on whether the UE is configured to monitor DCI format 0_0. This conditional parameter selection resolves the contradiction by adapting the reference signal choice to the UE's operational context, reducing interference while managing complexity through configuration-based decision-making.
2Measurement precision
If the UE monitors DCI format 0-0, then the first reference signal is used for power control, but this requires additional configuration and monitoring overhead
Solution Approach 1:
The patent implements a self-service mechanism where the UE autonomously determines which reference signal to use based on its own configuration state. The UE checks whether it is configured to monitor DCI format 0-0 and independently selects the appropriate reference signal (CSI-RS or SSB) without requiring continuous network intervention. This reduces monitoring overhead while maintaining measurement precision through configuration-aware selection.
Data Source
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AI summary
A method for performing wireless communication by a first apparatus is proposed. The method may comprise the steps of: determining power related to a sidelink (SL) transmission, on the basis of a downlink pathloss, wherein the SL transmission includes at least one from among a sidelink-synchronization signal/physical sidelink broadcast channel (S-SS/PSBCH) block transmission, a physical sidelink control channel (PSCCH) transmission, a physical sidelink shared channel (PSSCH) transmission, and a physical sidelink feedback channel (PSFCH) transmission; and performing the SL transmission on the basis of the power related to the SL transmission. For example, on the basis of being configured to monitor a downlink control information (DCI) format 0_0, the downlink pathloss may be determined on the basis of a first reference signal (RS) used for control of power related to a physical uplink shared channel (PUSCH) transmission to be scheduled by the DCI format 0_0. For example, on the basis of not being configured to monitor the DCI format 0_0, the downlink pathloss may be determined on the basis of a second RS related to a synchronization signal block (SSB) for acquiring a master information block (MIB).