5G NR V2X Resource Selection via Multi-Stage Exclusion
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Solution Overview
Problem
The existing 5G NR-V2X PC5 Mode 2 resource selection procedure faces issues due to the half-duplex problem and near-far problem, leading to interference and reduced spectral efficiency, as Tx UEs cannot simultaneously transmit and receive, and in-band emission interference occurs due to imperfect receiver filters.
Innovation Solution
A multi-stage exclusion process is implemented to exclude resources affected by the half-duplex and near-far problems by measuring sidelink received signal strength indicator (SL-RSSI) and sidelink reference signal received power (SL-RSRP) values, allowing for resource selection and reservation in a subsequent window without requiring HARQ re-transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Tx UEs transmit simultaneously in the same time slot, then spectral efficiency is improved, but half-duplex problem causes interference and communication failure
Solution Approach 1:
The patent applies preliminary action by performing sensing in a current window (sensing window) before resource selection in a next window (selection window). UEs measure SL-RSSI and SL-RSRP values in advance to identify affected resources, allowing them to select appropriate resources before transmission occurs, thus avoiding half-duplex interference while maintaining high spectral efficiency
2Ease of operation
If resources are selected without excluding affected resources, then resource selection simplicity is maintained, but near-far problem causes in-band emission interference
Solution Approach 1:
The patent segments the resource selection process into two distinct stages: a sensing window for measuring SL-RSSI and SL-RSRP values, and a selection window for resource selection and reservation. This segmentation allows complex interference avoidance to be broken down into manageable steps, maintaining operational simplicity while effectively preventing near-far interference through systematic resource exclusion
3Reliability
If HARQ re-transmissions are used to handle interference, then communication reliability is improved, but spectral efficiency is reduced due to redundant transmissions
Solution Approach 1:
The patent applies preliminary action by performing sensing and resource exclusion before transmission, identifying affected resources in advance and selecting clean resources proactively. This eliminates the need for reactive HARQ re-transmissions, improving spectral efficiency while maintaining communication reliability through preventive rather than corrective measures
Data Source
AI summary
One example embodiment provides one or more of: measuring, via a user equipment (UE), sidelink received signal strength indicator (SL-RSSI) values and sidelink reference signal power received (SL-RSRP) values from a current window of a communication channel shared among a plurality of UEs, measuring, via the UE, the SL-RSRP values from a frequency-domain and a time-domain of a current window of a communication channel shared among the plurality of UEs, excluding a first subset of communication resources from a next window of the communication channel based on the RSSI values in the current window, excluding a first subset of communication resources from a next window of the communication channel based on the SL-RSRP values from a time-domain, excluding a second subset of communication resources from the next window of the communication channel based on the RSRP values, excluding a second subset of communication resources from the next window of the communication channel based on the SL-RSRP values from a frequency-domain, and selecting and reserving resource(s) remaining in the next window of the communication channel after exclusion of the first and second subsets of communication resources from the next window.