Integration of video, voice and data transmission service based on PRMA wireless networks

Abstract

A new scheme for the integration of video, voice and data transmission over the Packet Reservation Multiple Access (PRMA) is proposed in this paper. We focus on low bit-rate video applications like video conferencing and visual telephony for wireless networks. The ITU-T H.263 standard provides a solution to the need for low bit-rate video compression under 64 Kbps. In this paper, the proposed protocol assumes that each voice terminal follows a traffic pattern of talk spurts and silent gaps with fixed permission probability ( P=0.3), and we assign the permission probability of voice terminals to be 6.4 times of data terminals. Also, each video terminal has the highest permission probability ( P=1) to access the available slot based on ITU-T H.263 standard. Again, we present a “pseudo reservation” scheme to release slots reserved by video terminals according to the contents of each video transmission buffer, and the active voice or data terminals can temporarily access the additional slots to improve the performance without sacrificing the video capacity of the system. The packet dropping probability of the active voice terminals, the mean delay of the active data terminals and bandwidth utilization of the system are superior to the original PRMA, as indicated in simulation results.