A New Network Selection Algorithm for Group Calls over Heterogeneous Wireless Networks with Dynamic Multi-Criteria

Communicating multimode mobile nodes (MNs) in HWNs are capable of supporting different classes of calls simultaneously. This is also referred to as group calls. Vertical handover (VHO) decision problem for group calls in HWNs is a complex multi-criteria group decision making (MCGDM) problem, very little attempt has been made to address this problem. Existing works in literature on network selection problem for group calls treat the multi-criteria for VHO as static criteria, however in NGWNs, criteria such as: MN's speed and network traffic load variation are dynamic and vital for wireless network selection for group calls. In this paper, we propose MULTIMOORA, a new decision making algorithm, for VHO decision and address the problem of network selection for group calls in HWNs. We investigate the impact of dynamic criterion and the degree of importance of class of call in group calls. The performance of the MULTIMOORA is validated by comparing it with TOPSIS, a well known MCGDM algorithm, however the performances of TOPSIS are seen to be unstable at high speed region, unlike MULTIMOORA.