Mobile Multimedia Access Protocols in Packet-typed Wireless Networks

摘要

In this paper, we present an access scheme for packet-typed wireless networks, called DQRUMA/PAR (Distributed-Queueing Request Update Multiple Access with Pe- riodically Automatic Reservation), which can transmit multime- dia traffic efficiently. Here, we deal with three kinds of traffic i.e. voice, data and still picture. DQRUMA/PAR introduces the transmission scheme that mobile stations for voice communica- tions reserve the transmission capacity periodically during their talkspurts. The transmission control process of DQRUMA/PAR will become easier than the one of DQRUMA, and the delay characteristic of voice is improved. Furthermore, we study two enforced protocols on DQRUMA/PAR. One is the more enforced protocol for voice communications. We call this as Voice Enforced mode (VE mode) on DQRUMA/PAR. The other is the more en- forced protocol for data communications. We call this as Data Enforced mode (DE mode) on DQRUMA/PAR. The transmis- sion delay of voice will become reduced significantly by introduc- ing VE mode. On the other hand, the transmission delay char- acteristic of data will be improved by introducing DE mode. We carry out the performance comparisons of pure DQRUMA/PAR with PRMA and DQRUMA and show the considerable improve- ment of the protocol numerically. Next we make the performance comparisons between pure DQRUMA/PAR and two enforced modes on DQRUMA/PAR and show the considerable iniprove- ments of these enforced protocols, respectively.