| Summary: | Vehicular Ad-Hoc networks(VANET) face with the requirements of high data rate and reliability. A clustering method based on stability was proposed to effectively increase communication time and reliability. Based on that, relay selection of data distribution in the vehicle cluster under the condition of limited power was studied. A relay selection method based on power pre-allocation is proposed. In this method, HDAF forwarding protocol is adopted in collaborative vehicles in cluster. Power allocation for source nodes and the potential relay nodes is done before real relay selection. Comparing the equivalent channel gain containing the power allocation factors to select the optimal relay nodes set，the numerical results show that the clustering method based on cluster stability has higher stability than the clustering method based on geographical location. At the same time, the proposed relay selection method has lower outage probability than traditional single relay amplify forward(SAF) and all relays amplify forward(AAF) under the same conditions.
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