Network selection delay comparison of network selection techniques for safety applications on VANET

One of the most challenge applications in VANET is a safety application. The important characteristic of this application is stringent time constraints. To satisfy these constraints, seamless handoffs must be provided. The mechanism making successful seamless handoffs is a network selection technique. Several techniques such as AHP, SAW, GRA and TOPSIS were proposed to select a network satisfying application QoS and user preferences. However, these techniques have not been empirically validated and feasibly studied on embedded boxes in vehicles. Since embedded boxes have limitations on memory usages, CPU speed and etc, then the selection techniques should consume small memory usages and low computation time. In this work, the decision tree for AHP is considered since it utilizes low computation time. Moreover, the empirical comparison and feasible study between AHP, SAW, GRA, TOPSIS and the decision tree for AHP are carried out. The results show that the computation delay of decision tree for AHP is much lower than the one of pre-existing techniques. However, the proposed technique uses little higher memory space than the others.