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

Abstract

A new, fully-distributed protocol for integrated voice/d&a traffic in a local-area, random-access broadcast network is described. The protocol introduces a movable voice-data boundary to framed TDMA/CSh4A 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 tragic class to the other increases the utilization of the channel. The protocol provides collision-free virtual circuits for voice and periods of non-persistent CSMAfCD for data traffic and call establishment, and can support multi-party calls as well as tw*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.

Resource allocation for real-time and non-real-time traffic in wireless networks

“…The proposed movable-boundary resource allocation scheme differs from the movable-boundary schemes in [1][2][3][4][5], in that real-time users can borrow the channels that are nominally allocated to non-real-time traffic. The movable-boundary scheme is compared with a fixed-boundary scheme, in which non-real-time channels are not lent to real-time users.…”

“…In order to study the performance of the proposed movable-boundary resource allocation scheme, we also describe a fixed-boundary resource allocation scheme, which is used to fairly compare with the proposed movable-boundary scheme. Note that we will not compare the proposed movable-boundary scheme with those schemes in [1][2][3][4][5] because those schemes in [1][2][3][4][5] are studied in the wireless networks with non-adaptive applications. However, we focus on the wireless networks with adaptive applications in this paper.…”

“…In the previous literatures [1][2][3][4][5], movable-boundary schemes, which are resource allocation schemes, for realtime and non-real-time traffic have been studied to increase the utilization of channels. The movable-boundary schemes perform channel allocations between real-time and non-realtime traffic.…”

“…Whenever there are not sufficient free real-time channels to satisfy the real-time traffic, the lent real-time channels are withdrawn. The movable-boundary schemes [1][2][3][4][5] do not allow real-time users to use the non-real-time channels, because real-time users using non-real-time channels will be forced to terminate their connections once the non-real-time channels are withdrawn.…”

“…Movable-boundary schemes in [1][2][3][4][5] were designed in the networks without adaptive applications. However, due to the property of adaptive applications, real-time users can dynamically borrow idle non-real-time channels to improve channel utilization and real-time users' perceived quality of services.…”