Reliability Enhancement for V2V Communications: via AF Relay Versus via Passive RIS
Zhou, Momiao Wu, Fan Wang, Kan Sun, Yanshi Liu, Lei Mumtaz, Shahid Guizani, Mohsen Niyato, Dusit
Zhou, Momiao
Wu, Fan
Wang, Kan
Sun, Yanshi
Liu, Lei
Mumtaz, Shahid
Guizani, Mohsen
Niyato, Dusit
Supervisor
Department
Machine Learning
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Journal article
Date
2025
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Language
English
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Abstract
In advanced vehicular networks, Roadside Unit (RSU)-based amplify-and-forward (AF) relay and passive Reconfigurable Intelligent Surface (RIS) are two potential helpers to enhance the vehicle-to-vehicle (V2V) communications when the direct link experiences poor quality. This paper presents a comprehensive comparison of the two enhancement modes from the outage performance perspective. In the presence of both direct link and enhanced link, the analytical expressions of the outage probability (OP) for the V2V communication under the two enhancement modes are derived respectively. Moreover, considering the co-channel interference caused by relay/RIS, the OP of the neighbouring vehicle-to-infrastructure (V2I) communication is also derived. Additional analysis compares the diversity order and the strength of interference created by the V2V communication under the two enhancement modes. Further discussions are presented on the effect of the channel estimation error and phase quantization error under the RIS mode. Finally, the pros and cons of the two enhancement modes are demonstrated by both the analytical and numerical results.
Citation
M. Zhou et al., "Reliability Enhancement for V2V Communications: via AF Relay Versus via Passive RIS," in IEEE Transactions on Communications, vol. 73, no. 5, pp. 3702-3717, May 2025, doi: 10.1109/TCOMM.2024.3492052.
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IEEE Transactions on Communications
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Keywords
diversity order, outage probability (OP), Reconfigurable intelligent surface (RIS), relay, vehicle-to-vehicle (V2V)
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Publisher
IEEE