Vertical Handover Based on Voice Activity in Heterogeneous Network

A heterogeneous network consists of multiple access networks interworking together. Vertical handover is the technique that allows for seamless connectivity among these networks. This vertical handover when used specifically during the off periods of the VoIP (Voice over Internet Protocol) connection, then the QoS can be improved. This paper provides such a method in which we derive a simplified two-state Markov model from the six-state Brady model in which both the talk-spurt period and mutual silence period characteristics are obtained. Then the handover execution time and packet loss time are taken as parameters to analyze the performance. The result is that decrease in VoIP packet loss time. However vertical handover procedure increases within the allowable limit.