The multiple access control (MAC) problem in a wireless network has intrigued researchers for years. For a broadband wireless multimedia network such as wireless ATM, an effective MAC protocol is very much desired because efficient allocation of channel bandwidth is imperative in accommodating a large user population with satisfactory quality of service. Indeed, MAC protocols for a wireless ATM...

This paper evaluates a Markov decision approach to single–link Call Admission Control for CBR/VBR and ABR/UBR services. Two different schemes that support integration of narrowband ABR/UBR and wide-band CBR/VBR services are evaluated: the standard preemptive scheme and the modified partial blocking scheme. The structure of the Markov decision policy shows an ”intelligent blocking” feature, whic...

This presentation considers some practical issues of traffic management in ATM (Asynchronous Transfer Mode) networks. Firstly, we illustrate a fundamental dilemma of statistical multiplexing in ATM networks when small loss ratio, small delay and high utilization are expected at the same time. Although there are a lot of solutions to this problem, all of them have some disadvantages. Therefore i...

The multiple access control (MAC) problem in a wireless network has intrigued researchers for years. For a broad-band wireless network such as wireless ATM, an effective MAC protocol is very much desired because efficient allocation of channel bandwidth is imperative in accommodating a large user population with satisfactory quality of service. Indeed, MAC protocols for a wireless ATM network i...

Recently, HTTP streaming has become very popular for delivering video over the Internet. For adaptivity, a provider should generate multiple versions of a video as well as the related metadata. Various adaptation methods have been proposed to support a streaming client in coping with strong bandwidth variations. However, most of existing methods target at constant bitrate (CBR) videos only. In ...

Most existing H.263+ rate control algorithms, e.g. the one adopted in the test model of the near-term (TMN8), focus on the macroblock layer rate control and low latency under the assumptions of with a constant frame rate and through a constant bit rate (CBR) channel. These algorithms do not accommodate the transmission bandwidth uctuation e ciently, and the resulting video quality can be degrad...

For admission control in real time multimedia systems, buuer space, disk bandwidth and network bandwidth must be considered. Most admission control mechanisms developed to date have been based on the CBR data model and have used a static period length. These mechanisms do not use system resources eeectively, since media data is usually encoded with VBR compression techniques. We propose an admi...

In this paper we consider an ABR traac stream which shares an output port of a switch with delay sensitive CBR/VBR traac. Congestion control of the ABR traac is achieved by means of an Explicit Rate congestion control scheme. The occupancy of the ABR-buuer in the switch is analytically evaluated. Application of the analysis on numerical examples illustrates the innuence of the following system ...

A rate-based congestion control algorithm has been developed and standardized in the ATM forum for ABR service class. Even though the performance of the rate-based congestion control algorithm heavily depends on the selection of those control parameters, the selection method of parameters is not shown in the standard. In this paper, by extending our previous work, appropriate settings of rate-c...

Rate-based congestion control promises effective traffic management for the ABR service class suitable to data communications in ATM networks. There have been proposed several rate-based congestion control schemes in the ATM Forum, including Enhanced Proportional Rate Control Algorithm (EPRCA) and EPRCA++ methods. While many studies have been devoted for these schemes in the past, only ABR traf...