Multi-Access Strategies for Voice/Data Integration in Heterogeneous Mixed-MediaPacket Radio Networks

摘要

The problem of voice/data integration in a mixed-media packet radio networkemploying both ground radio links and SATCOM radio links is investigated. Multi-access strategies are devised to take advantage of different characteristics of both radio channels to better serve the requirements of both traffic types. Code-division multiple-access with movable boundary in the code domain is used in the ground subnetwork to serve the voice traffic and the retransmitted data traffic while framed ALOHA with movable boundary is used on the satellite subnetwork for both data and voice. Based on a Markovian model of the system, a complete analysis of the channel access protocols for both traffic types is given. The performance of the multiple-access schemes used in this mixed-media network is evaluated in terms of voice and data throughput, voice blocking probability, and data delay. It is observed that splitting of retransmission traffic between the satellite and ground subnet may increase the overall data throughput when the voice load is high. Communications network, Multiple access, Voice/data integration.