Performance analysis of WIMA/SAD protocol for integrated voice/data wireless networks

In this paper, the "Wireless Integrated Multiple Access (WIMA) with Speech Activity Detector (SAD)" protocol for Time Division Duplex (TDD) and Frequency Division Duplex (FDD) hierarchies is proposed and analyzed. This scheme is based on a mixture of movable-boundary WIMA protocol and speech activity process. Both voice and data traffic are handled on a packet reservation basis. The access slot of every uplink frame is allocated on the last slot to save the waiting time of queuing data. The expected data-packet delay for fixed-boundary WIMA, movable-boundary WIMA, and WIMA/SAD protocols are evaluated. Numerical results illustrate the dependence of performance on the system parameters, and demonstrate that the WIMA/SAD protocol provides a lower expected data-packet delay than the movable-boundary WIMA protocol for the values of voice-call completion probability (mu(v)) less than 0.1. As mu(v) increases, the expected data-packet delay of the WIMA/SAD protocol approaches to movable-boundary WIMA protocol. The maximum data throughput of WIMA/SAD protocol has smaller variation than that of the movable-boundary WIMA protocol when voice-call completion ratio is changed.