The usage of Road Side Units (RSUs) acting as a buffer point in VANETs alleviates the intermittent vehicle-to-vehicle (V2V) connectivity problem. However, due to the vehicle mobility and the short RSU-transmission-range, a vehicle dwells short time inside an RSU. Nevertheless, quick response from the RSU server, helps a driver to make a quick decision while driving. Network coding is known to be efficient for broadcasting multiple data items in a single packet by encoding requested data items based on the cache information of the vehicles. This can significantly improve the broadcast bandwidth usage as well as reduce the response time of the system. However, this requires the prior knowledge of cached data items of vehicles. Hence vehicles need to upload the cache information to the RSU server. This wastes upload bandwidth. In multi-RSU VANETs, we propose an approach to apply network coding in such a way so that vehicles do not need to upload their cache information to the server. Applying network coding improves the broadcast performance of an RSU in terms of minimizing the deadline miss ratio of the generated requests by vehicles, and reducing the response time of serving requests by the RSU server. Simulation results support our claims.
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