Sidelink Signal Transmission Power Control for V2X ACI Mitigation
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Solution Overview
Problem
Current wireless communication systems, particularly in V2X scenarios, face challenges in efficient platooning management and channel selection due to Adjacent Channel Interference (ACI) effects, which impact the reliability and latency of Vehicle-to-Everything (V2X) communications.
Innovation Solution
A method and apparatus for transmitting sidelink signals in a wireless communication system, where user equipment receives Channel Busy Ratio (CBR) values from other devices, determines a CBR value for transmit power control, and transmits this information to adjust power settings, effectively managing channels and mitigating ACI in V2X systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve communication reliability in V2X scenarios, then reliability is improved, but adjacent channel interference increases
Solution Approach 1:
The patent dynamically adjusts transmit power parameters based on CBR measurements and platoon characteristics. By changing power levels adaptively rather than using fixed high power, the system maintains communication reliability while reducing adjacent channel interference when conditions permit.
Solution Approach 2:
The system implements dynamic power control where transmit power is adjusted in real-time based on channel conditions (CBR), platoon size, and distance factors. This dynamic approach allows the system to optimize between reliability and interference generation continuously.
2Measurement precision
If channel busy ratio monitoring is performed frequently to improve channel selection accuracy, then channel selection accuracy is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent implements selective CBR monitoring where UEs monitor channel busy ratio at optimized intervals rather than continuously. The monitoring frequency is adjusted based on platoon characteristics and channel conditions, performing partial monitoring that suffices for accurate channel selection without excessive overhead.
Solution Approach 2:
The system performs preliminary CBR measurements and channel assessments before platoon formation or channel switching decisions. By preparing channel information in advance, the system reduces latency during actual channel selection while maintaining accuracy through pre-gathered data.
3Object-generated harmful factors
If power control adjustments are made individually by each UE to reduce interference, then interference reduction is improved, but coordination complexity increases
Solution Approach 1:
The patent merges power control decisions at the platoon level rather than requiring individual UE coordination. The leading UE or gNB consolidates CBR information from multiple UEs and makes centralized power adjustment decisions, reducing coordination complexity while maintaining interference reduction benefits.
Solution Approach 2:
The system introduces an intermediary (leading UE or gNB) that mediates power control between individual UEs and the network. This intermediary aggregates information and distributes coordinated power control commands, simplifying the coordination mechanism while achieving interference reduction.
Data Source
AI summary
An aspect of the present disclosure provides a method of transmitting a sidelink signal by a user device in a wireless communication system, the sidelink signal transmission method comprising the steps of: receiving information on at least one channel busy ratio (CBR) value for a sidelink channel from another user device; determining a CBR value for transmission power control on the basis of the information on at least one CBR value and a CBR value measured by the user device; and transmitting a sidelink signal including information on the CBR value for transmission power control to the another user device, wherein the information on the CBR value for transmission power control is commonly used for determination of transmission power of each of the user device and the another user device.