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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 presented a fast fasten control algorithm (2FCA) in wireless sensor networks for information processing and transmitting. Using anycast technology, 2FCA can fast fasten broken routing path, which will decrease failure delay and increase packets' success rate. In the algorithm, it restricts participant nodes to save scarce energy and bandwidth resource, and then prolongs network's lifetime...
Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment. So far diverse congestion detection methods for sensor networks are proposed. In this paper we introduce numerous congestion detection parameters and examine them in various respects; finally we choose one of them as the best parameter for video traffic in wireless sensor networks...
As the Session Initiation Protocol (SIP) becomes more and more the core of the communication networks convergence, there is urgent need to manage the critical problem of SIP service availability under extreme overload. This paper proposes a novel solution to control SIP overload. We demonstrate the efficiency of the approach compared with a well known SIP overload control algorithm. The solution builds...
A framework for the joint design of wireless network and controllers is proposed. Multiple control systems are considered where the sensor measurements are transmitted to the controller over the IEEE 802.15.4 protocol. The essential issues of wireless networked control systems (NCSs) are investigated to provide an abstraction of the wireless network for a co-design approach. We first present an analytical...
We consider a model of congestion for computer networks based on a continuous-time finite-state homogeneous bivariate Markov chain. The model can be used to evaluate, via computer simulation, the performance of protocols and applications in a network with random path delays and packet losses due to traffic congestion. Only one of the processes of the bivariate Markov chain is observable. In our application,...
EMKC is an explicit congestion control algorithm which is designed for high bandwidth delay product (BDP) networks. Although delay-independence is an appealing characteristic, the EMKC system developed in exhibits undesirable equilibrium properties and slow fairness convergence behavior. To overcome these drawbacks, we propose a new method called AEMKC (Advanced Exponential Max-Min Kelly Control)...
The paper presents the comparative study and analysis of buffering in Goback2 network. The performance at the destination node by applying different buffering capacities at the routers is demonstrated. The results using NS2 simulator are produced. It can be concluded that the selection of appropriate type of buffering helps in controlling the congestion and the packet drops at the link node.
Low Extra Delay Background Transport (LEDBAT) congestion control algorithm is designed to address the unfairness problem of TCP aggravated by applications that use multiple TCP connections for data transfer. LEDBAT operates under the assumption that the queue delay at the access router of the bottleneck link will be the primary varying contributor to end-to-end one-way delay. However this assumption...
Delay Tolerant Network (DTN) is a network in which end-to-end connectivity may not be guaranteed because of the frequent and long duration partitions. SMART routing, which is a selective controlled-flooding scheme, utilizes travel companions of the destinations and improves the delivery opportunities, but its flooding overhead can be further controlled. In this paper, we propose A-SMART routing which...
Today's Internet is a massive, distributed network which continues to grow in size as globalization takes major role in everyone's life. The problem is complicated by the fact that one cannot rely on the cooperation of individual servers and routers to aid in the collection of network traffic measurements vital for these tasks. Packet Forwarding Priority can have a significant impact on the performance...
A learning automata (LA) is an automaton that interacts with a random environment, having as its goal the task of learning the optimal action based on its acquired experience. here, we present a ERQD algorithm for congestion avoidance in wired networks. The main aim of this algorithm is to optimize the value of the average size of the queue used for congestion avoidance and to consequently reduce...
We have already proposed the framework of autonomous decentralized control based on local-interaction as a novel control mechanism for communication networks. This framework is based on the relation between local interaction and the solution yielded by a partial differential equation. In this framework, the state of the complete system is controlled by appropriately designing the autonomous operation...
DCCP is proposed to replace UDP for its ability of congestion control while maintaining its promptness by ignoring lost packets as UDP does. The network would suffer less congestion. However, whether the applications that switch from UDP to DCCP can maintain their needed performance or not is a big question. This paper investigates this problem by evaluating DCCP based VoIP vs. a variety of TCPs using...
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...
Mobile Ad Hoc Networks (MANETs) have been an important research topic for the last years, playing a crucial role within the fast growing sector of mobile communications. At the same time, video applications over mobile devices are becoming widely used by nowadays mobile clients, where the quality in the transmission of such contents will determine the success of these applications in the future. Therefore,...
Cellular networks provide a range of communication services and are the principal wireless technology for domestic and business users. However, in cellular networks, an accident or a storm or a malicious action may cause a base station to fail and so be unable to provide radio coverage to sections of users. Such base station failures also might result in user congestion to nearby operational base...
This paper presents S-SFQ which is a single queue design and implementation of the well-known Start-time Fair Queueing (SFQ). This aggregate queue orders packets based on their timestamps rather than order of arrivals. Through simulation, we show the performance gains of S-SFQ over other default single-queue schemes such as RED and FIFO in terms of link utilization and flow fairness. When sources...
Many studies have shown that Vegas TCP has a better throughput and stability than Reno TCP in homogeneous networks with a single TCP flavor, but performs less well in heterogeneous networks in which two TCP flavors coexist. The progressive behavior of Reno TCP and the conservative behavior of Vegas TCP cause a bias when they are used simultaneously, and thus Vegas TCP fails to obtain a fair share...
This work presents a study of a SIP-based IP telephony system in terms of Quality of Service (QoS) and admission probability. The system is designed for an enterprise with offices in different countries. A software IP PBX maintains the dial plan, and SIP proxies are used in order to implement Call Admission Control (CAC) and to allow the sharing of the gateways' lines. The system is implemented in...
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