Radio Resource Management for NR V2X Sidelink Interference
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Solution Overview
Problem
Current wireless communication systems face interference and coexistence issues between sidelink and uplink/downlink radio links in network-assisted NR V2X communications, leading to degraded performance due to concurrent operation on overlapping frequency bands and shared radio resources.
Innovation Solution
Implementing improved radio resource management techniques that allow user equipment (UE) to communicate with base stations to receive and report interference and measurement configuration information, enabling dynamic reconfiguration of resource allocations between sidelink and uplink/downlink links to mitigate interference and optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sidelink and uplink/downlink communications operate concurrently on overlapping frequency bands, then communication coverage and functionality are improved, but interference between links increases and performance degrades
Solution Approach 1:
The patent implements dynamic resource allocation where the base station continuously monitors interference levels between sidelink and uplink/downlink communications and adjusts resource allocations in real-time. UE devices dynamically switch between sidelink and uplink/downlink modes based on current interference conditions, transforming the static frequency band assignment into a flexible, adaptive system that resolves interference while maintaining communication versatility.
Solution Approach 2:
The system changes operational parameters including frequency band selection, time resource allocation, and power levels based on measured interference conditions. When interference is detected, the base station modifies resource allocation parameters to redistribute spectrum usage between sidelink and cellular links, thereby reducing harmful interference while preserving the ability to operate on overlapping bands when conditions permit.
2Productivity
If shared radio resources are used for sidelink and uplink/downlink links, then resource utilization efficiency is improved, but interference and performance degradation occur
Solution Approach 1:
The patent segments shared radio resources into distinct time-frequency slots allocated to either sidelink or uplink/downlink communications based on priority and interference conditions. Instead of allowing continuous shared access that causes interference, the system divides resources into manageable segments that can be dynamically assigned, thereby maintaining high resource utilization while preventing performance degradation through controlled separation of conflicting transmissions.
Solution Approach 2:
The system implements feedback mechanisms where UE devices report channel quality and interference measurements to the base station, which then adjusts resource allocation decisions. This closed-loop control enables the system to maintain high resource utilization efficiency by continuously optimizing the distribution of shared radio resources between sidelink and cellular communications based on real-time performance feedback.
3Reliability
If dynamic reconfiguration of resource allocations is implemented, then interference mitigation and performance optimization are improved, but system complexity and signaling overhead increase
Solution Approach 1:
The patent enables UE devices to autonomously monitor interference conditions and make local resource selection decisions based on pre-configured criteria received from the base station. This self-service approach reduces the need for continuous centralized control and complex signaling, as devices independently adapt their transmissions to minimize interference while maintaining reliable communication performance.
Solution Approach 2:
The base station provides preliminary resource configuration and interference management parameters to UE devices before actual communications begin. This preliminary setup includes pre-defined resource pools, interference thresholds, and allocation rules that enable devices to perform dynamic reconfiguration locally without requiring complex real-time negotiations, thereby reducing system complexity while achieving effective interference mitigation.
Data Source
AI summary
Various radio resource management techniques may be implemented to reduce in-device coexistence issues and/or interference between a Uu link established between a mobile device (first UE) and a base station (first NB), and a sidelink/PC5 link established between the first UE and another mobile device (second UE), where the second UE is served by a different base station (second NB). The first UE may receive, from the first NB, measurement configuration information that enables/configures the first UE to report to the NB any indication(s) of issues caused by communications between the first UE and the second UE over the PC5 link affecting communications between the first UE and the first NB over the Uu link, and/or communications over the Uu link affecting communications over the PC5 link. The first NB may analyze the feedback from the first UE and may implement mitigation measures to reduce/eliminate any interference and/or in-device-coexistence issues.