Multimedia Transmission based on PRMA Wireless Networks

Abstract

This paper proposes a new scheme for the integration of voice and video transmission over the Packet Reservation Multiple Access (PRMA) system that is a modification of Reservation-ALOHA protocol. We focus on low bit-rate video applications like video conferencing and visual telephony for wireless communications. The ITU-T H.263 standard provides a solution to he need for low bit-rate video compression under 64Kbps. 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 each video terminal has higher 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 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 bandwidth utilization of the system are superior to the original PRMA as indicated in simulation results.