NR V2X Sidelink Carrier Selection Using Dual CBR Feedback
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Solution Overview
Problem
In vehicle-to-everything (V2X) systems, particularly in new radio (NR) V2X sidelink communication, there is a challenge in ensuring communication quality for unicast and multicast services when the candidate carrier selected by a transmitter is not applicable to the receiver, leading to potential reception failures.
Innovation Solution
A method where terminal devices measure channel busy ratios (CBRs) of carriers and share measurement results to select a candidate carrier that meets specific CBR thresholds, ensuring the carrier is applicable to both devices for normal sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transmitter selects a candidate carrier based on its own CBR measurement, then the carrier selection process is simple and fast, but the receiver may fail to receive the transmission because the carrier is not applicable to the receiver
Solution Approach 1:
The receiver feeds back its CBR measurement results to the transmitter, allowing the transmitter to adjust its carrier selection based on receiver conditions. This feedback mechanism ensures the selected carrier is applicable to both devices while maintaining efficient selection process
Solution Approach 2:
The receiver performs CBR measurement in advance before receiving transmission data, and shares these preliminary measurement results with the transmitter. This allows the transmitter to pre-determine an appropriate carrier that will work for both devices before actual transmission occurs
2Reliability
If both terminal devices measure and share CBR results to select a candidate carrier, then the communication quality is ensured, but the system complexity increases
Solution Approach 1:
The CBR measurement and sharing mechanism serves multiple functions: it enables carrier selection, ensures communication quality, and provides channel condition information for optimization. This multi-functionality reduces the need for separate complex mechanisms
Solution Approach 2:
The system uses CBR as a key parameter to characterize channel conditions and make carrier selection decisions. By changing the selection criterion from purely transmitter-based to bidirectional CBR-based, the system achieves better reliability without requiring complex additional mechanisms
Data Source
AI summary
This application provides a communication method and a communication apparatus, and relates to the communication field. In the method, a second terminal device sends a first measurement result to a first terminal device, and the first terminal device may determine a candidate carrier based on the first measurement result and a second measurement result. The first measurement result includes a channel busy ratio (CBR) that is of each carrier in a first carrier list and that is obtained by the second terminal device through measurement, and the second measurement result includes a CBR that is of each carrier in the first carrier list and that is obtained by the first terminal device through measurement.