NR-LTE V2X Resource Partitioning for Cross-Technology Interference
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Solution Overview
Problem
The coexistence of LTE V2X and NR V2X devices in the same frequency channel poses challenges due to issues such as automatic gain control (AGC) impact from NR PSFCH transmissions, different subcarrier spacings, and non-ideal resource orthogonality, which can degrade system performance without requiring changes to the LTE design.
Innovation Solution
Implement semi-static and dynamic resource partitioning mechanisms, including orthogonal resource configuration, inter-UE coordination, and enhanced detection and avoidance mechanisms to mitigate these issues, ensuring efficient resource allocation without impacting LTE or NR operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE V2X and NR V2X devices operate in the same frequency channel, then spectrum utilization is improved, but interference and system performance degradation occur due to AGC impact, different subcarrier spacings, and non-ideal resource orthogonality
Solution Approach 1:
The patent segments the frequency channel into separate resource pools for LTE V2X and NR V2X devices. By dividing the available spectrum into distinct resource allocations with orthogonal time-frequency structures, the system enables coexistence while preventing interference between the two technologies, thus maintaining reliability while utilizing the same frequency channel.
Solution Approach 2:
The patent implements dynamic resource allocation mechanisms that adaptively adjust resource assignments based on traffic conditions, device types, and channel states. This dynamic approach allows the system to optimize spectrum utilization in real-time while maintaining proper isolation between LTE and NR resources to prevent performance degradation.
2Loss of information
If NR PSFCH transmissions are enabled, then feedback capability is improved, but automatic gain control (AGC) impact degrades LTE reception performance
Solution Approach 1:
The patent extracts or isolates the NR PSFCH feedback transmissions into dedicated time-frequency resources that are orthogonal to LTE resource allocations. By separating the feedback function into its own protected resource pool, the system maintains full feedback capability while preventing AGC disruptions to LTE receptions through proper resource partitioning and timing alignment.
3Reliability
If different subcarrier spacings are used for LTE and NR, then each technology can optimize its performance, but resource orthogonality deteriorates causing interference
Solution Approach 1:
The patent applies local quality by assigning different subcarrier spacings to different resource pools within the same frequency channel. LTE resources use one subcarrier spacing configuration optimized for LTE performance, while NR resources use another configuration optimized for NR performance. The orthogonal time-frequency allocation ensures that these different local characteristics coexist without causing interference, maintaining both technology-specific optimization and overall resource orthogonality.
Data Source
AI summary
Various embodiments herein provide techniques related to a user equipment (UE). The UE may identify, by a long term evolution (LTE) sidelink (SL) module that is to facilitate communication via a first SL channel of a first cellular network, a resource that is to be used for communication in the first SL channel by another UE; provide, by the LTE SL module, information related to use of the resource to a new radio (NR) SL module that is to facilitate communication via a second SL channel of a second cellular network; and exclude, by the NR SL module based on the information related to use of the resource, the resource for communication via the second SL channel. Other embodiments may be described and/or claimed.