In vehicular ad-hoc network (VANET), due to its unique characteristics such as high nodes' speed, dynamic network topology and variable nodes' density, end-to-end data transmission faces many challenges. To address these challenges, many routing protocols specially for VANET have been proposed. But a chief part of them are designed only in network layer and independently of other layers. Besides, few of them consider the influence of interference. In this paper, we propose a new cross-layer routing with interference constraint for VANET which combines technologies of network layer and MAC layer. First, we adopt a location-based resource allocation algorithm to constrain interference between vehicles. Then on the basis of it, relay is selected depending on their geographical zones. In addition, we also use the relative distance among vehicles and the reception Signal to Interference plus Noise Ratio (SINR) of hello messages to optimize the relay selection scheme. By simulation, we compare it to other protocols and experimental results show that our routing protocol outperforms existing solutions in terms of packet delivery ratio (PDR).
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