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Congestion control is vital in the streaming of a video sequence or clip, as network traffic varies unpredictably requiring constant adjustment of the transmission rate. Standard TCP-Friendly Rate Control (TFRC) wastes bandwidth and may react to congestion only when packet loss has already occurred. This paper presents a unicast transport protocol named RRB-SIMD for video streaming over the Internet,...
This paper proposes a learning approach to solve adaptive Connection Admission Control (CAC) schemes in future wireless networks. Real time connections (that require lower delay bounds than non-real-time) are subdivided into hard realtime (requiring constant bandwidth capacity) or adaptive (that have flexible bandwidth requirements). The CAC for such a mix of traffic types is a complex constraint...
Stringent QoS maintenance in a wireless environment for VoIP communication is a major challenge. VoIP inherently generates constant bit rate traffic and is highly sensitive to network delay. However, unpredictable network congestion makes a VoIP session so degraded that its QoS goes below a tolerable limit. Accordingly, a suitable solution is needed to adapt varying network conditions satisfying minimum...
In mobile ad hoc networks, routing protocol area is a challenging issue. In spite of recent research, MANETs lack load balancing capabilities, and thus, they fail to provide expected performance especially in the case of a large volume of traffic such as real time traffic. In this paper, we propose a simple but very efficient algorithm to support Quality of Service (QoS), by the use of load-distributing...
Multimedia real-time traffic is deemed to be dominant in future communication systems. One of the reference applications to support real-time traffic is the Real-time Transport Protocol (RTP), which can be used to transmit multimedia contents on real-time basis. At the same time, Real-time Transmission Control Protocol (RTCP) is used for receiving feedback and getting information about the network...
In Measurement Based Admission Control (MBAC), the decision of accepting or rejecting a new flow is based on measurements of the current traffic. Since MBAC relies on measurements, an in-depth understanding of the measurement error and how it is affected by the underlying traffic is vital for the design of a robust MBAC. The consequence of the measurement error is that flows are accepted in error,...
The volume of Internet traffic increases every year, caused by increased amounts of individual information. Quality of Service (QoS) controls is necessary to manage this traffic. Differentiated Service (Diffserv) is a promising technique to realize scalable QoS control in the internet; extensive efforts have been made for its practical use and it is already introduced in some networks. The control...
This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control mechanism for multimedia traffic that exploits vertical handoff as an effective tool to enhance radio resource management while guaranteeing handoff user's QoS requirements. The network resources utilized by the vertical handoff...
In this paper, we propose an adaptive Call Admission Control for IEEE 802.16 scheduled flows. As the WiMAX defined services aim to adapt the bandwidth grant to the data rate of accepted sessions, a powerful CAC that takes into account flows characteristics and their heterogeneities must be used. Our proposal aims to take advantage of the variability of traffics and to adapt the CAC according to the...
This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control scheme for multimedia traffic that exploits vertical handoffs as an effective tool to enhance radio resource management while guaranteeing handoff users' QoS requirements. The network resources utilized by the vertical handoff...
The real-time applications are both sensitive to delay and loss. As a result, quality of service guarantees have attracted a lot of research interest in the past decade. Dynamic management of system parameters like bandwidth and buffer capacity allows to gain essential performance benefits while quality of service guarantees are met. For the recent years a method of admission control based on measurements...
This paper introduces a fuzzy logic traffic priority-based call admission control scheme for code division multiple access (CDMA) cellular mobile systems. In the new method, if the traffic load is low and the available network resource is enough, a call of any priority is admitted into the system. Otherwise, only the calls of higher priority are admitted, and the others of lower priority are blocked.
Quality of service guarantees have attracted a lot of research interest in the past decade as real-time applications are sensitive both to delay and loss. Dynamic management of system parameters like bandwidth and buffer capacity allows to gain essential performance benefits while quality of service guarantees are met. Recently, a method of admission control based on measurements (MBAC) have received...
This paper presents a novel scheme called per-priority flow control (PPFC) as an extension to the IEEE802.3x standard using a simple and efficient node buffer management strategy, where a physical channel was divided into several virtual channel based on the bandwidth value (QoS parameter) embedded into the IPv6 flow label field of each flow. Moreover, it investigates performance of new proposed priority...
The capacity of a multi-hop wireless network is the traffic payload that it can transport. This is a prominent quality of service issue, particularly in the highly constrained settings of 802.11 wireless mesh network. In this paper, we consider two complementary definitions of the capacity. A network-wise capacity is defined as the sum of the upload traffic, and a flow- wise capacity highlighting...
Quality of Service (QoS) support for traffic plays an important role in Wireless Sensor Networks (WSNs). In WSNs, traffic is usually a mix of time-sensitive packets and reliability-demanding packets. Hence, admission control regardless of the characteristics of packets is not efficient. In this paper, taking both delay and reliability into account, we propose a novel admission control algorithm for...
IP Television (IPTV) is a new service that is growing up very quick in recent years. Its implementation is performed as a Triple-Play service, being the integration of voice, high-speed data and television. Moreover, the network traffic has been increased due to the use of VoIP, video or P2P. It is also creating congestion problems to the network provider and has high impact on the quality of IPTV...
Localized Quality of Service (QoS) routing has been recently proposed for supporting the requirements of multimedia applications and satisfying QoS constraints. Localized algorithms avoid the problems associated with the maintenance of global network state by using statistics of flow blocking probabilities. Using local information for routing avoids the overheads of global information with other nodes...
This paper presents a VoIP packet loss model applicable to wireless access transmission media and usable for determination of admissible call number threshold value. The main contribution is a more realistic approach for VoIP packet loss evaluation. The known bufferless fluid-flow method is applied but a new simple exact formula for ACT voice packets loss is developed. The suggested method is evaluated...
This paper describes an adaptive scheme for Call Admission Control (CAC) for multi-class service wireless cellular networks. The proposed CAC scheme can be achieved through call bandwidth borrowing and call preemption techniques according to the priorities of the traffic classes, using complete sharing of the available bandwidth. However, the CAC scheme maintains QoS in each class to avoid performance...
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