A Multi-Band Redundancy Scheme to Enhance V2N2V Communication Reliability in Mobile Networks
Jin Nakazato, Mikio Hasegawa, Manabu Mikami · 2025
As Level 4 automated driving systems are increasingly deployed worldwide, ensuring ultra-reliable and low-latency communications has become critical for safety and coordination, especially in platooning applications of trucks and Bus Rapid Transit (BRT). One major challenge in 5G networks is the occurrence of latency spikes caused by Data Radio Bearer (DRB) suspension during inter-cell handovers (HOs). This paper proposes a practical multi-band redundancy scheme for Vehicleto-Network-to-Vehicle (V2N2V) communications that leverages two frequency bands operated by a single mobile network operator (MNO). The proposed method duplicates packets over both bands, enabling seamless communication even when a handover disrupts one link. We implement the scheme using 5G modems and validate it through field trials on live commercial 5G Standalone (SA) network environments in both urban and suburban areas. Experimental results demonstrate that the proposed approach mitigates latency spikes, effectively reducing the probability of one-way end-to-end (E2E) communication latency exceeding 40 ms to less than 0.05 %, compared to 6 % and 2 % in single-band 1.7 GHz and 700 MHz scenarios, respectively. We confirm the viability of our method for enhancing V2N2V communication reliability in real-world 5G networks without requiring modifications to existing infrastructure or protocols.