DESIGN AND SIMULATION OF VERTICAL HANDOVER ALGORITHM FOR VEHICULAR COMMUNICATION

摘要

The primary objective in this work is to design and simulate a novel handover algorithm in heterogeneous radio network for intelligent transportation system (ITS). Analytic hierarchy process (AHP) is used to solve decision problem in multiple constraint environment. The user preferences are taken into consideration in this algorithm. A case study is illustrated to demonstrate the effectiveness of this model. Several network contexts like received signal strength (RSS), initial delay for connection establishment, network traffic load and bandwidth offered, service context like usage cost, user contexts like type of application and terminal context like speed of the vehicle are considered as different attributes of this algorithm. RSS is considered as the triggering factor, i.e, a network will be considered as an alternative only if its RSS is above threshold. The proposed method decides the priority of radio access network that is most suitable for users application at a particular vehicular speed in the constraint resource environment. Sensitivity analysis is done to justify the design of the algorithm. This algorithm is specific to vehicular communication system and hence variation in network selection with vehicle speed is presented. The results show that the presented model not only realistically optimizes the best available network on the move but also avoids unnecessary handovers. Simulation work has been carried out in the MATLAB environment.