Sidelink Resource Exclusion for NR-LTE Coexistence Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resource conflicts between different communication technologies, particularly in the context of 5G NR and LTE sidelink transmissions, leading to interference and suboptimal resource utilization.
Innovation Solution
A method and apparatus for wireless communication that involves obtaining resource pool information, priority information, and LTE sidelink control information to exclude candidate resources from sidelink transmission when certain conditions are met, such as high LTE RSRP and overlapping PSFCH slots with LTE subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resource sharing between 5G NR and LTE sidelink is implemented, then spectrum utilization is improved, but resource conflicts and interference increase
Solution Approach 1:
The patent applies preliminary action by having the first device sense LTE sidelink resources in advance (in a sensing window before the transmission time window) and determine excluded resources based on predicted LTE transmissions. This advance sensing and exclusion determination prevents resource conflicts before they occur, enabling safe resource sharing between 5G NR and LTE sidelink while maintaining high spectrum utilization.
2Reliability
If PSFCH resources are configured for feedback transmission, then communication reliability is improved, but resource overlap with LTE subframes causes interference
Solution Approach 1:
The patent applies the extraction principle by identifying and removing conflicting resources from the available resource pool. The first device determines a set of excluded resources based on sensed LTE SCI information and PSFCH configuration, then selects candidate resources from the remaining non-excluded resources. This extraction of conflicting resources ensures PSFCH feedback transmission reliability while avoiding interference with LTE subframes.
Solution Approach 2:
The patent uses an intermediary approach by introducing a resource exclusion mechanism that mediates between PSFCH feedback transmission requirements and LTE sidelink operations. The exclusion determination based on sensed LTE resources acts as a mediator, allowing PSFCH to operate reliably without direct resource overlap interference with LTE subframes.
3Manufacturing precision
If sensing window is extended to improve resource selection accuracy, then resource management is improved, but processing time and complexity increase
Solution Approach 1:
The patent applies partial action by configuring the sensing window to sense LTE sidelink resources only for a specific duration before the transmission time window, rather than continuously sensing indefinitely. This partial sensing approach provides sufficient accuracy for resource exclusion determination while limiting the time loss to an acceptable range, achieving a balance between resource selection accuracy and processing time.
Data Source
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AI summary
Provided are a method by which a first device performs wireless communication and an apparatus supporting same. The first device may: acquire information related to a resource pool; acquire first priority information for sidelink transmission; receive, from a second device, long term evolution (LTE) sidelink control information (SCI) including resource reservation information and second priority information; and determine a set of candidate resources for the sidelink transmission.