Sidelink CSI-RS Power Control for UE Interference Reduction
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Solution Overview
Problem
Existing 5G NR V2X systems lack a specific solution for reducing interference between UEs in sidelink communication, particularly in groupcast and unicast transmissions, by calculating transmit power based on sidelink pathloss.
Innovation Solution
Implementing a method where UEs exchange sidelink control information (SCI) and sidelink channel state information reference signals (CSI-RS) to facilitate the calculation of sidelink pathloss, using MAC control elements for priority and including rank indicators and channel quality information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve communication coverage and reliability, then link quality is improved, but interference between UEs in sidelink communication increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmit power based on measured sidelink pathloss. The transmitting UE calculates pathloss using the formula: pathloss = transmit power - received power + compensation value. By changing the power parameter adaptively rather than using fixed high power, the system maintains communication reliability while reducing unnecessary interference to other UEs in the sidelink network.
Solution Approach 2:
The patent implements feedback mechanisms where the transmitting UE measures the received power of reference signals from the receiving UE, calculates the sidelink pathloss, and uses this feedback information to adjust its transmit power. The system continuously monitors channel conditions and adjusts power levels accordingly, creating a closed-loop control system that balances reliability and interference reduction.
2Object-generated harmful factors
If sidelink pathloss measurement and power control are implemented for groupcast and unicast transmissions, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a power control mechanism that works across multiple transmission types (broadcast, groupcast, and unicast) using the same fundamental principles. The transmitting UE uses the same pathloss measurement approach and power adjustment logic regardless of the transmission type, reducing the need for separate complex mechanisms for each mode while achieving interference reduction across all scenarios.
Solution Approach 2:
The patent implements self-service by enabling UEs to autonomously measure pathloss, calculate appropriate transmit power levels, and adjust their own transmission parameters without requiring complex centralized control. Each UE independently performs reference signal measurements, calculates its own pathloss, and adjusts power accordingly, reducing overall system complexity while achieving interference management.
Data Source
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 terminal is provided, the method comprising: transmitting, to a second terminal, sidelink control information (SCI) includes information field associated with a request of sidelink channel state information (CSI); transmitting, to the second terminal, a sidelink channel state information reference signal (CSI-RS) in response to the information field indicating request of the sidelink CSI; receiving, from the second terminal, the sidelink CSI obtained based on the sidelink CSI-RS.