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We present an empirical model of the upstream end-to-end Voice-over-IP (VoIP) delay over a mobile, multi-hop wireless network towards a single gateway. First, we define the “VoIP regime” as the regime of network operation in which a fraction 1 - ϵ of the packets are received by the gateway within the maximum tolerable VoIP networking delay yvoip, and such that e is less than a maximum tolerable outage...
BitTorrent developers have recently introduced a new application layer congestion control algorithm based on UDP framing at transport layer and currently under definition at the IETF ledbat Working Group. Ledbat is a delay-based protocol which aims at offering a ``lower than Best Effort'''' data transfer service, with a lower priority with respect to elastic TCP and interactive traffic (e.g., VoIP,...
In wireless communication networks, TCP is a widely applied solution as it guarantees the delivery of data by implementing acknowledgement based techniques and used in wired networks as it ensures guard against the common remedy congestion in networks. Deploying TCP over wireless networks, restrictions such as random link errors, random packet loss, node distance, constantly changing topology are...
A wireless link is generally characterized by high transmission errors, random interference and a varying latency. The erratic packet losses usually lead to a curbing of flow segments on the SCTP association and thus limit SCTP's performance. To improve the performance of SCTP protocol under high-speed environments over wireless networks, a bandwidth estimation mechanism and a per-stream-based error...
Heterogeneous communication networks with their variety of application demands, time-varying load, and mixture of wired and wireless links pose several challenging problems in modeling and control. This paper focuses on estimation of the round trip time which is important for the transport layer because it impacts the throughput of TCP and allows efficient development of congestion control techniques...
Various studies have shown that regular TCP is inefficient in high-speed networks. This paper proposes F-TCP, a delay-based TCP variant, which is able to operate efficiently in high-speed networks. The slowstart phase of F-TCP continues until a threshold determined from probing the available bandwidth. When competing with loss-based flows F-TCP reduces it's window to a value derived from the available...
To prevent decoding failure of MPEG-based applications caused by error propagation, the present study modifies multi-streaming mechanism of SCTP protocol and proposes a transmission control approach which can adjust transmission policy dynamically according to the quality of service requirement of individual frame. The simulation results confirmed that the proposed scheme can improve the performance...
In the research area of TCP throughput prediction, the well-known throughput model, a function of loss rate, has some disadvantages such as difficulty of loss rate estimation and low accuracy under congestion. This letter proposes a new throughput model by a function of available bandwidth. Our model improves the accuracy in TCP throughput prediction by removing loss rate, which is usually hard to...
To improve the performance of TCP transmission, round-trip time (RTT) estimation is often adopted as an effective approach. There exist many positive or passive methods for RTT estimation, but rarely of them take account of RTT's self-similarity which should not be ignored. In this paper, a new RTT estimation algorithm employing adaptive filtering is proposed. The algorithm is based on RTT's self-similarity...
In message ferry delay tolerant network, certain dedicated mobile nodes (message ferries) facilitate data transfer between disconnected regions of network. Message ferries travel around partitions of network, collecting data from nodes and delivering it to others. Due to high mobility of nodes and network partitioning, such a data transfer can be highly unreliable and it becomes really challenging...
In this paper, we propose a novel fuzzy logic congestion control mechanism to improve throughput performance of transmission control protocol (TCP) in wireless high-bandwidth delay networks. It is based on a receiver centric method of which the available bandwidth is measured at the receiver. The available bandwidth utilization serves as an incipient network congestion indicator, which acts as one...
In this document, we introduce Cap Start TCP, an adaptive Slow Start scheme that consistently achieves fast TCP file transfer times regardless of high speed network scenario. Once the TCP session is established, we estimate TCP session path capacity scenario, and tune the transport protocol to deliver fast transfer times. We demonstrate significant transaction performance improvements, of as much...
The analysis of Internet traffic behavior under the pressure of long range dependence congestion factors has a great importance for performance management, anomaly detection and QoS control. The choice of methods using for analysis depends on the goal of description, accuracy requirements, measurement tools and assumptions concerning stochastic feature of network processes. Analysis without robust...
TCP throughput is one of the major communication quality metrics. In order to grasp this metric by active measurement while imposing a lower load, various estimation techniques have been proposed. These techniques are categorized as either equation-based or history-based; here we focus on the latter. Conventional history-based estimation techniques target a wired environment and estimate temporally...
An emerging approach for improving the performance of TCP in ad hoc multihop networks is to limit the maximum congestion window (CWNDmax) that a TCP connection is allowed to reach, in order to eliminate the number of outstanding segments and increase the TCP stability. In the present work, we propose an adaptive scheme to bound the CWNDmax value in an IEEE 802.11 ad hoc network. Our contributions...
TCP Westwood (TCPW) is a sender side modification of TCP congestion control. It estimates the connection rate by monitoring the acknowledgment reception rate; this estimation is used to compute congestion window and slow start threshold. The sender continuously computes the current eligible rate estimation: upon a packet loss the sender sets the slow start threshold and the congestion according to...
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...
Detecting user's quality of experience is a method which deals with estimating how a user perceives the network performance. Although user's behavior is very complex, only analyzing a large amount of operational network data enables us to effectively detect the users satisfaction from the network. One important parameter to detect user's behavior is user's interruption of the TCP connections in case...
In wired networks, congestion is the main reason for most of the packet losses and the original TCP is the best option to implement. However, in wireless networks, these losses will arise for reasons other than congestion. TCPW has been proved to work better in performance and bandwidth utilization than Reno and New Reno in wireless networks. Our research mainly focuses on the slow-start phase of...
In this paper we propose a vertical handover mechanism for TCP to deal with the delay and bandwidth change during the handover. The proposed mechanism relies on the interaction between the sender and the receiver during the handover and requires no a prior information of the new path. The adaptation is triggered by a handover notification at the receiver and finishes in about two round-trip time....
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