The rapid popularization of multimode terminals that simultaneously run multiple services (such as browsing web pages during a video session) has brought decent amount of attention to the network selection problem of multimode terminals. However, most of the network selection algorithms proposed for vertical handoff are only suitable for terminals running a single service. This paper proposes a network selection algorithm for multiservice multimode terminals in heterogeneous wireless networks. The algorithm takes into account user preferences, network attributes and service characteristics. Entropy and Fuzzy Analytic Hierarchy Process (FAHP) are used to calculate the objective weights of the network attributes and the weights determined by the service characteristics respectively. The comprehensive weights of network attributes are obtained by combining the user preferences and the service priority. At the same time, different utility functions are used to calculate the utility values of the network attributes for multiservice. Finally, the Simple Additive Weighting (SAW) method is used to synthesize the utility values and the comprehensives weights, while the most appropriate network is selected by Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) and a threshold. The simulation results show that the proposed algorithm can accurately select the most appropriate network by considering different factors. Compared with the existing two MMT network selection algorithms, it can reduce the number of vertical handovers and obtain better user experience while satisfying user’s preferences and service’s requirements, thus solving the multiservice multimode terminals network selection problem.

Algorithm of wireless network selection is used to ensure that users can access to the most suitable network when the connected network can't satisfy users' requirement. Previous network selection algorithms are based on single attribute of wireless network. In the next generation network, it will make error if the algorithm still adopts single standard because the complexity is increased, so the algorithm should adopt several network performance evaluation, it is also known as multiple attribute decision making (MADM). This paper proposes an algorithms based on MADM, named wireless network selection algorithm based on independence of influence factors of QoS (WNSAIFQ). WNSAIFQ complies with the principle that the lower nodes are the reason of the upper nodes strictly, this removes the interdependence between those network's properties effectively. The experiment results based on a hardware network platform showed that this algorithm is better than others in aspects of network selection and error control.