NR Sidelink Power Control Using CSI-RS Pathloss Feedback
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Solution Overview
Problem
In the 3GPP 5G New Radio (NR) V2X system, sidelink communication faces challenges in supporting groupcast and unicast transmissions without adequate solutions to reduce interference between UEs, particularly in calculating transmit power based on sidelink pathloss.
Innovation Solution
A method involving channel state information reference signal (CSI-RS) transmission and feedback to facilitate link adaptation, including Layer 1 (L1) Reference Signal Received Power (RSRP) measurement and Layer 3 (L3) RSRP generation and filtering, with various feedback mechanisms such as periodic, aperiodic, and irregular L1-RSRP feedback to optimize sidelink pathloss calculation and power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sidelink communication supports groupcast and unicast transmissions, then communication versatility is improved, but interference between UEs increases
Solution Approach 1:
The patent implements power control by dynamically adjusting the transmit power parameter based on measured pathloss between UEs. The transmitting UE measures downlink pathloss from the network side and uses this measurement to calculate and adjust uplink sidelink transmit power, thereby adapting the power parameter to reduce interference while maintaining versatile groupcast and unicast communication capabilities
2Length of stationary object
If transmit power is increased to extend transmission distance, then coverage is improved, but interference between UEs increases
Solution Approach 1:
The patent implements power control by dynamically adjusting the transmit power parameter based on measured pathloss between UEs. The transmitting UE measures downlink pathloss from the network side and uses this measurement to calculate and adjust uplink sidelink transmit power, thereby adapting the power parameter to reduce interference while maintaining versatile groupcast and unicast communication capabilities
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a first user equipment, UE, comprises receiving, from a second UE, sidelink radio resource control, RRC, signaling for sidelink measurement configuration; identifying a reference signal, RS, used to obtain layer 3 filtered reference signal received power, L3-RSRP, receiving, from the second UE, the RS; obtaining a measurement result based on the RS, the measurement result including the L3-RSRP obtained based on the sidelink measurement configuration, and transmitting, to the second UE, a report including the measurement result.