Performance Improvement for Multimedia Transmission Services based on Wireless Networks

A new scheme for the integration of video and voice 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.263standard provides a solution to the need for low bit-rate video compression under 64Kbps. In this paper, the proposed protocol assumes that each voice terminal fol1ows a traffic pattern of talk spurts and silent gaps with dynamic permission probability. And each video terminal has the highest permission probability to access the available slot based on ITU- T H.263 standard. Again, we present a ”pseudo release” 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 and throughput of the system are superior to the original PRMA, as indicated in analysis results.