Real-time monitoring design of a wireless network device for vertical handover on multimod terminals

In this paper we propose a software module for continuously monitoring a wireless network card, able to handle and rise IEEE 802.21 compatible primitives in support for vertical handover in heterogeneous networks. This module is intended to be installed on a multimod mobile terminal, and will automatically monitor and switch the connection link, when performing vertical handover. Besides the software architecture, we describe the real-time behavior of the module by using state machine diagrams.