The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
With increase in the heterogeneity and complexity of the Internet, many problems have emerged in the traditional TCP Reno. Against the problem, we have proposed a new bandwidth- based TCP congestion control mechanism, TCP Symbiosis. Unlike the recent works on delay-based and hybrid congestion control, TCP Symbiosis relies on the bandwidth measurement to control the congestion window size. Although...
Resource optimization is a very important aspect in cognitive radio network (CRN). It is a typical multi-objective optimization problem. This paper proposes a mixed multi-objective immune cloning genetic algorithm (MMGA) to solve the optimization of resource allocation in CRNs. Based on the genetic algorithm of non-domination sort, the MMGA adds external memory immune operator and cloning operator...
This paper focuses on the issue of flow distribution for multimode mobile terminals in heterogeneous networks, and proposes a flow distribution algorithm based on priority and weight self-production mechanism. The algorithm utilizes the notion of "priority" , assigning higher priorities to more important sessions, therefore ensuring these sessions have the preferential utilization of the...
In this paper we consider a call admission control (CAC) protocol for a cellular system which supports both voice and data traffic. CAC is needed to meet the challenges of how to support the guarantees of quality of service (QoS) with the limited capacity. CAC protocol for cellular system should efficiently support handoff and maintain high resource utilization. Our paper provides a comparative study...
The Internet is changing from being only an efficient platform for data delivery to become also a platform for audio/video applications. The stability of the traditional Internet is due to the TCP congestion control algorithm. However, the TCP congestion control is not optimal for VoIP applications because of its retransmission mechanism and additive increase multiplicative decrease sliding window...
This paper presents the analysis and estimation of effective bandwidth of a router, handling multi-class traffic. Analysis is done with marginal buffering as well as large buffers. Performance of a periodic on-off source is compared with that of a Poisson??s source with marginal buffering. Bandwidth requirement of the sources for a given Quality of Service is worked out. The analysis is then extended...
Layered multicast protocol (LMP) is designed to support simultaneous and real-time multimedia content distribution to large number of disparate receivers across the heterogeneous Internet. However, the current layered multicast protocols (LMPs) use the techniques that do not correctly model TCP behaviour, which results in the protocols can't fairly compete with TCP. TCP-friendly layered multicast...
Inherently, the operational processes of a large number of digital communication systems are based on input events. Therefore, discrete event-based system (DEVS) model is an appropriate tool to model such systems. On the other hand, as communication networks become more popular, congestion control becomes more vital. This necessitates the design and development of a suitable model that is able to...
TCP-friendly rate control (TFRC) is a congestion control mechanism that can compete fairly with TCP while maintaining a much smoother transmission rate. The smoothness is achieved at the cost of responsiveness, which makes it slow to settle down when handed-over to a different network. In this paper we will study how to improve the TFRC performance when the available bandwidth is changed during a...
Data Center Networks present a novel, unique and rich environment for algorithm development and deployment. Projects are underway in the IEEE 802.1 standards body, especially in the Data Center Bridging Task Group, to define new switched Ethernet functions for data center use. One such project is IEEE 802.1Qau, the Congestion Notification project, whose aim is to develop an Ethernet congestion control...
TCP-friendly rate control(TFRC) is an equation-based congestion control mechanism that competes fairly with TCP but has a much lower throughput variation, which makes it a better choice for streaming over the Internet. It is known that in a mobile network environment, after a handover TFRC can overshoot or under utilize the new link if the conditions there differ from those of the old link. There...
Admission control is a key management function in wireless networks, particularly wireless mesh networks (WMNs), in order to support multimedia applications that require quality of service (QoS) guarantees. Even using state of the art schemes to provide QoS, if the amount of traffic in the network is allowed to increase in an uncontrolled manner, network performance will deteriorate significantly...
Streaming media applications require acceptable levels of quality of service (QoS). Appropriate rate control mechanism is needed to make streaming media applications to adapt to dynamic network conditions. This paper discusses a window-based weighted-fairness AIMD (WF-AIMD) congestion control algorithm which allows competing flows to share a common bandwidth according to their weights. By making flows...
Supporting real-time data transport in highly dynamic conditions, which arise in wireless and mobile ad hoc networks is challenging. The significant variations in link bandwidth and latency undermine the quality of real-time applications by introducing congestion and delay jitters. For such applications data is only useful before its lifetime expires. In this paper we investigate a staleness-aware...
BBN Technologies designed an algorithm called Swift Start for TCP to mitigate the start up problem. Some drawbacks face that algorithm. This paper introduces a modification to that algorithm then it will evaluate the modified swift start TCP congestion control algorithm analytically and by simulation and then it will compare between its performance with that of slow start TCP and the original swift...
In this paper a robust active queue management (AQM) for TCP flows is designed. We synthesized a robust controller by using the Hinfin control based on weight method. This was done by defining two weights W1(s) and W2(s); the first taking account of the desired performances and the second insuring the robustness of the controller to the model uncertainties. We also compared our controller with other...
The multi-access scheme of 802.11 wireless networks imposes difficulties in achieving predictable service quality in multi-hop networks. In such networks, the residual capacity of wireless links should be estimated for resource allocation services such as flow admission control. In this paper, we propose an accurate and non-intrusive method to estimate the residual bandwidth of an 802.11 link. Inputs...
Since TCP congestion control is ill-suited for high speed networks, designing a replacement for TCP has become a challenge. To address this problem, we extend the population ecology theory to design a novel congestion control algorithm. We treat the network flows as the species in nature, the throughput of the flows as the population number, and the bottleneck bandwidth as the food resources. Then...
This paper discusses implications of possible metastability of TCP-type fair bandwidth sharing under random flow arrivals/departures for understanding and defending the Internet against cascading failures. Cascading failures can be viewed as a process of network transition from desirable metastable mode with finite number of flows in progress to the congested mode. It is possible to eliminate or reduce...
Based on an identification and evaluation of the subtle counterproductive interactions between the WLANs MAC layer and the transport layer, this paper shows a new approach towards congestion control for WLANs. We introduce a specialization of TFRC (MTFRC: mobile TFRC), which is adapted to wireless access networks. This TFRC specialization requires only slight changes to the standard TFRC protocol...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.