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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...
Traditionally, it had been assumed that the efficiency requirements of TCP dictate that the buffer size at the router must be of the order of the bandwidth-delay (C × RTT) product. Recently, this assumption was questioned in a number of papers, and the rule was shown to be conservative for certain traffic models. In particular, by appealing to statistical multiplexing, it was shown that on a router...
The separation between edge and core addresses has been proposed to address the scalability problem of the Internet routing system. One main challenge is to design an efficient mapping mechanism for the two address spaces. The layer structure is attractive because of its scalability and simple index mechanism, while existing layered mapping system lacks a clear structure study and faces serious deployment...
In this paper we propose a Packet-based measurement technique called Floating IP Active Measurement (FIPAM) that utilizes routing loop to measure Delay and Throughput in IP networks. Calculating these parameters in multi-provider and complex networks like Internet has became a challenge as most of current active measurement tools relying on ICMP and majority of today's networks block ICMP traffics...
This Transmission control protocol (TCP) detects congestion only after a packet has been dropped and it would be undesirable to have large queue because it would significantly increase the average delay in the network. In the current high speed networks, it is increasingly important to have mechanisms that keep throughput high but average queue sizes low. This paper presents comparison between two...
In this paper, we discuss how to discriminate the queue type in the network for end-to-end congestion control. FAST TCP is one of end-to-end congestion avoidance techniques and designed to accept FIFO and drop tail queue. However, existing AQM routers in the recent Internet may interrupt that such end-to-end congestion avoidance protocols perform well. At first, we examine the behavior of FAST TCP...
Video distributions using TCP (called "TCP streaming") like YouTube have been increased rapidly with the improvement on the speed and capacity of the Internet. Thus, it is an important technical issue to guarantee QoS (quality of service) suitable for TCP streaming. However, it is difficult for the existing IP network to guarantee QoS of the TCP streaming. So far, in order to achieve the...
Parallel transmission is one of the popular techniques to realize huge bandwidth between two network nodes. However, in parallel transmission, many packet order inversions will be occurred when the delay difference among the routes is large, and TCP throughput will be drastically decreased under such a circumstance. In this paper, a TCP over SCTP (Stream Control Transmission Protocol) parallel transmission...
We propose a model of router queue buffering with FAST TCP flows in dumbbell networks. Using this model, we analysis the transient dynamic of router queue buffering with different scenarios. It is found that, network settings as well as FAST TCP parameters can influence router queue buffering transient performance. We provide simulation results to verify the theoretical results.
This paper provides parameter setting and 2-D local stability conditions for TCP/RED networks. In general, a network cannot avoid congestions due to the limit of network capacity. The RED scheme is one of the representative AQM that was proposed to avoid and alleviate network congestions. However, the issue of network stability with many TCP subscribers needs to be considered when setting the RED...
A mechanism for reducing reverse traffic in the fuzzy logic based dual explicit congestion notification mechanism is proposed for satellite TCP/IP networks. A linguistic hedge based backward explicit congestion notification (BECN) activation function is employed in order to ensure that reverse traffic is generated only when congestion is extremely high. A source initiated RTT reverse traffic reduction...
Although RED has been widely used with TCP, however it has several known drawbacks [1]. The BLUE algorithm that benefits from a different structure has tried to compensate some of them in a successful way [2]. A quick review on active queue management algorithms from the very beginning indicates that most of them tried to improve classic algorithms. Some of them use network traffic history to achieve...
Explicit congestion notification (ECN) is a mechanism that can be used to provide early indication of impending Internet congestion, and as such can be used to reduce the latency and improve the throughput of applications using the Internet. This paper examines the impact of using ECN with quality of service classification for Internet paths that include a satellite delay. Specifically, it provides...
A novel RED algorithm named as SFPID-RED is proposed in this paper, which uses self-tuning fuzzy proportional integral derivative/differential (PID) controller to adjust the maximum drop probability of RED based on TCP fluid model. Thus, stable router buffer queue size is obtained, the dynamic self-adaptability of the networks is accomplished, and meanwhile the drawbacks of static RED parameters setting...
Multi-homing has been widely adopted in todaypsilas Internet. Several solutions have been proposed to support multi-homing, and Shim6 became most promising for IPv6-based next generation Internet. This paper proposes a Shim6-based dynamic path-selection mechanism, which selects path adaptively to earn higher bandwidth utilities and better performance. The experiment result shows that the new mechanism...
One of the expectations of service overlay networks is to improve routing quality of end-to-end communications. To do this, a new source routing method is proposed. The new method improves communication quality by switching paths according to the information of available resources of the lower network layer. End-to-end bandwidth, round trip time, and hop count are measured by Inline TCP measurement,...
After analyzing the rule of TCP congestion window protocol based on AIMD, the paper deduces the requisite route buffer and queuing delay of standard TCP and N-TCP when link reaches 100% utilization rate, and discusses the effect to the two achieving throughputs (bandwidth utilization) when the router buffer changes. Theoretical analysis and simulation show that, with the router buffer decreasing and...
There is a growing need to support real-time applications over the Internet. Real-time interactive applications often have multiple quality-of-service (QoS) requirements which are application specific. Traditional provisioning of QoS in the Internet through IP routing - Intserv or Diffserv - faces many technical challenges, and is also deterred by the huge deployment issues. As an alternative, application...
In this paper, an active queue management (AQM) for TCP flows is designed by means of Lyapunov theory. To this end, we choose a non conservative Lyapunov candidate function which allows knowing how the marking/droping process should be done to achieve stability. This design leads to an AQM based on rate mismatch which insure responsiveness to the variation of the network's characteristics, and is...
FAST TCP is a newly developed transfer control protocol for future networks with high bandwidth delay product. At present, analyzing the stability of FAST TCP in different networks is an active research area. We establish a group of nonlinear delay differential equations to describe the window adjustment algorithm of FAST TCP and the queuing behavior of routers in single-link multi-source networks...
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