Single Frequency Full-Duplex Resource Management for V2X
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Solution Overview
Problem
In V2X systems, single frequency full-duplex communication faces inefficiencies due to the need for SFFD-capable UEs to avoid reserved resources, which can reduce spectral efficiency.
Innovation Solution
A method where SFFD UEs determine whether to communicate on reserved or non-reserved resources based on RSRP, RSSI, full-duplex self-interference, or priority, allowing partial or full overlap with reserved resources for SFFD operation, leveraging self-interference cancellation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SFFD-capable UEs completely avoid reserved resources, then interference is minimized, but spectral efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the resource selection criteria based on measured RSRP, RSSI, and self-interference levels. UEs transition from a static avoidance strategy to a dynamic selection strategy where the decision to use reserved or non-reserved resources is based on real-time channel conditions and interference measurements, thereby optimizing spectral efficiency while maintaining reliability.
Solution Approach 2:
The patent implements dynamics by making the resource selection process adaptive and flexible. Instead of fixed avoidance of reserved resources, the system dynamically evaluates each resource based on current channel conditions, allowing UEs to exploit reserved resources when interference is low and avoid them when interference is high, thus resolving the contradiction between reliability and productivity.
2Productivity
If SFFD UEs utilize reserved resources, then spectral efficiency is improved, but interference increases
Solution Approach 1:
The patent employs feedback mechanisms where UEs measure actual interference levels (RSRP, RSSI, self-interference) and use this feedback to make informed resource selection decisions. This closed-loop approach allows the system to exploit reserved resources when feedback indicates low interference conditions while avoiding them when interference is high, thus improving spectral efficiency without excessive interference.
Solution Approach 2:
The system changes the parameter of resource selection from binary (reserved vs. non-reserved) to a continuous evaluation based on measured interference parameters. By thresholding the measured RSRP, RSSI, and self-interference values, the system dynamically determines the optimal resource set, balancing spectral efficiency and interference management.
3Device complexity
If reserved resources are strictly enforced, then resource management is simple, but full-duplex operation is limited
Solution Approach 1:
The patent transforms the static reserved resource enforcement into a dynamic evaluation process. The system maintains simplicity through a clear decision framework (compare measured parameters against thresholds) while achieving versatility by allowing SFFD operation under appropriate conditions. This dynamic approach enables the system to adapt to different network conditions without overwhelming complexity.
Solution Approach 2:
The patent segments the resource selection process into distinct steps: measuring RSRP/RSSI, calculating self-interference, comparing against thresholds, and selecting resources. This segmentation maintains manageable complexity while enabling sophisticated full-duplex operation. The segmented approach allows each component to be optimized independently and simplifies implementation.
Data Source
AI summary
In one aspect, resource selection may be performed where single frequency full-duplex (SFFD) UEs are present in a V2X system. Signaling and procedures may enable the coexistence of half-duplex (HD) and SFFD-capable UEs. Based on the resource reservation information obtained from other UEs, the SFFD UE may determine which among the reserved time-frequency resources is amenable for performing the SFFD operation. In one aspect, the time-frequency resources chosen for SFFD may partially or fully overlap with the reserved time-frequency resources, based on the self-interference cancellation capability of the SFFD UE, the RSRP, and/or the RSSI on the reserved time-frequency resources. Accordingly, the full-duplex capability of an SFFD-capable UE may be leveraged, and spectral efficiency improved.