Railway Freight Dispatching Telephone System Based on VoIP in Wireless Networks

摘要

Railway freight dispatching telephone system is a kind of railway dispatching telephone systems, providing freight coordinating communication service. It requires high transmission data rate, high interactivity and customizable service in a high mobility environment. VoIP in wireless networks is a promising technology. It is significant to design a railway freight dispatching telephone system based on VoIP in wireless networks (IEEE 802.11 and IEEE 802.16). This paper analyzes the requirements of VoIP-based railway freight dispatching telephone system, proposes VoIP architecture for railway freight dispatching telephone system, analyzes the QoS performance of VoIP-based railway freight dispatching telephone system, and deployed experiments on a 20km railway freight line testbed.