DRX-Aware PSCCH Reception for NR V2X CBR Measurement
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining the Channel Busy Ratio (CBR) value for sidelink (SL) communication in NR V2X, which is crucial for optimizing resource allocation and improving communication reliability and latency in vehicle-to-everything (V2X) scenarios.
Innovation Solution
A method and device for determining CBR in NR V2X that involves performing SL receptions during on-duration and off-duration periods of discontinuous reception (DRX) operations, distinguishing between physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) receptions, and calculating CBR based on received signal strength indicators (RSSI) to identify suitable subchannels for PSCCH detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL reception is performed continuously during both on-duration and off-duration periods, then measurement precision of CBR is improved, but use of energy increases
Solution Approach 1:
The patent implements periodic SL reception by configuring DRX cycles with on-duration and off-duration periods. The UE performs PSCCH/PSSCH receptions during on-duration periods and suspends them during off-duration periods, creating a periodic measurement pattern that reduces energy consumption while maintaining acceptable CBR measurement precision through selective sampling of channel conditions
2Reliability
If PSCCH and PSSCH receptions are both performed, then reliability of SL communication is improved, but device complexity increases
Solution Approach 1:
The patent segments the SL reception process into two distinct phases: PSCCH reception during on-duration periods for control information acquisition, and PSSCH reception during subsequent periods for data transmission. This segmentation allows the UE to process control and data channels separately with different complexity requirements, managing overall device complexity while maintaining communication reliability through complete protocol execution
3Productivity
If CBR measurement includes both PSCCH and PSSCH receptions, then productivity of resource allocation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies local quality by measuring CBR specifically on PSCCH resources rather than including PSSCH receptions. Since PSCCH carries critical control information and its successful detection is prerequisite for PSSCH reception, measuring CBR based on PSCCH alone provides locally optimized measurement precision for control channel resource allocation, which directly improves resource allocation productivity for SL communications
Data Source
AI summary
A method for performing sidelink communication includes: performing first SL reception in a first time interval in which a timer relating to SL DRX operation operates; performing second SL reception in a third time interval included in a second time interval in which the timer does not operate; and performing SL transmission related to the first and/or second SL reception, wherein the first SL reception performed in the first time interval within a CBR window includes PSCCH reception and PSSCH reception, the second SL reception performed in the third time interval within the CBR window includes the PSCCH reception but not the PSSCH reception, and a first CBR value related to the second time interval is a ratio of sub-channels, which have an SL RSSI value no less than a first threshold value and include a PSCCH resource, from among all sub-channels to be attempted for PSCCH detection.