Sidelink CBR Measurement Using Multiple Start Positions in Unlicensed Band
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel congestion and reducing latency, particularly in the context of emerging technologies like 6G, which require high data rates, low latency, and reliable connectivity.
Innovation Solution
Implementing a method for measuring sidelink received signal strength indicator (RSSI) and channel busy ratio (CBR) in a resource pool, utilizing a channel busy ratio measurement window, and determining a SL CBR based on the location of specific starting symbols within a slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple starting symbols are allowed in a slot for sidelink transmission, then resource allocation flexibility and data rate are improved, but channel congestion and measurement complexity increase
Solution Approach 1:
The patent segments the channel busy ratio measurement process by separating RSSI measurement from CBR calculation. The receiving device measures RSSI at a specific reference time point (second starting symbol location) and separately determines CBR based on this measurement, rather than measuring at multiple time points. This segmentation simplifies the measurement process while maintaining accurate channel congestion assessment despite multiple starting symbols being used for transmission.
2Reliability
If channel busy ratio measurement is performed over a measurement window, then channel congestion management is improved, but measurement time and latency increase
Solution Approach 1:
The patent performs RSSI measurement at a predetermined reference time point (second starting symbol location) within the measurement window, rather than continuously measuring throughout the entire window. This preliminary action at a specific reference point provides sufficient information for accurate CBR determination, reducing the effective measurement time while maintaining reliable channel congestion assessment.
3Measurement precision
If RSSI is measured at multiple starting symbol locations, then measurement accuracy is improved, but processing complexity and time consumption increase
Solution Approach 1:
The patent introduces a reference time point (second starting symbol location) as an intermediary for RSSI measurement. Instead of directly measuring and processing signals from multiple starting symbol locations, the system uses this reference point as a mediator to obtain a representative RSSI value. This intermediary approach maintains measurement accuracy while significantly reducing processing complexity by eliminating the need to handle multiple separate measurements.
Data Source
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AI summary
A method for performing wireless communication by a first device and a device for supporting same are provided. The method may comprise the steps of: measuring a sidelink (SL) received signal strength indicator (RSSI) over a channel busy ratio (CBR) measurement window in a resource pool; and acquiring an SL CBR on the basis of the measurement. For example, on the basis that a first start symbol and a second start symbol are allowed in a slot within the resource pool, the SL RSSI may be measured on the basis of a position of the second start symbol.