A framed movable-boundry protocol for integrated voice/data in a LAN

Abstract

A new, fully-distributed protocol for integrated voice/data traffic in a local-area, random-access broadcast network is described. The protocol introduces a movable voice-data boundary to framed TDMA/CSMA and eliminates the requirement of system-wide synchronized clocks. The movable boundary is a major advantage in any system where fluctuations in voice and data loads are expected because assignment of idle capacity from one traffic class to the other increases the utilization of the channel. The protocol provides collision-free virtual circuits for voice and periods of non-persistent CSMA/CD for data traffic and call establishment, and can support multi-party calls as well as two-way conversations. The protocol allows variable-size voice packets that have very low overhead and variable-size data packets that may be much longer than voice packets. This is of significant practical advantage over previous work, which has required fixed-size voice and/or data packets, or voice packets with high overhead. A method of dynamically controlling the movable boundary to balance the voice and data traffic is also proposed.

H3M — A Rapidly Deployable Architecture with QoS Provisioning forWireless Networks

“…In the past, extensive analysis and simulation have demonstrated the feasibility and performance capability of DRAMA [4][5][6][7][8]. As a first step to be assured that H3M can be provide similar performance in an extended environment, it is necessary to extend the analysis of DRAMA into the areas where differences occur.…”

“…Considerable analytical and simulation work was conducted to document the CSMAlCD performance for DRAMA [4][5]. The early work [4] plus work by others [9,25] examined the effect of framing on CSMAlCD while the later work [5] showed that when a LAN uses multiple channels, it is more effective to segregate the synchronous and asynchronous data onto separate channels. WM does not have this option available, so we needed to extend the original work to verify that changing bandwidth and sending frequencies is a feasible alternative method for load balancing.…”

Performance investigation of a document retrieval system on a voice-data integrated token ring local area network

“…This protocol introduces a movable voice-data boundary to framed TDMA/CSMA and eliminates the requirement of system wide synchronized clocks [50]. The movable boundary is a major advantage in any system where fluctuations in voice and data loads are expected because assignment of the idle capacity from one class to the other increases the utilization of the channel.…”

“…• CSMA/CD may be used for voice transmission, provided the basic CSMA/CD operation is altered [50,38]. This approach may either be expensive or infea-sible.…”

“…• CSMA/CD may be used for voice transmission by developing a very complex algorithm [50,56] for handling voice. This, again, does not seem to be a feasible idea especially since an alternative, the token passing protocol is available.…”