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SCTP is a new transport layer protocol extending the functionality of TCP with support for performance enhancing services such as multihoming and multistreaming. Unfortunately, an accurate mathematical model, able to approximate performance results, still eludes the research community. Previous models either fail to provide practicality, or are too simplified in their assumptions. This paper aims...
This paper presents a hybrid congestion control algorithm supporting throughput efficiency, TCP friendliness and RTT fairness, in order to provide highly smart multimedia streaming over the Internet. Recent studies on TCP and TFRC are evolving to achieve better throughput efficiency and RTT fairness. Examples are Hybrid TCP congestion control, VTP and TCP-Libra, where the former two improve throughput...
This paper investigates a TCP proxy that splits a TCP connection into two parts consisting of a wireless link and a wired network. The TCP proxy is effective for improving TCP performance in such a heterogeneous network including a wireless link, on which transmission errors occur. This paper describes how the TCP proxy produces large size forward data due to a packet loss on the wireless link. It...
Networks are at the core of global communication. The impact network changes have on network performance has been of concern to researchers. In various configurations, network performance has been evaluated using many methods. The paper presents findings of a network performance evaluation where multiple hardware routers were implemented on a test-bed and performance difference between the two versions...
This paper proposes a FEC/ARQ integration in retransmission protocol which is an error control scheme investigation based on a convolutional code for data transmission. The integration is known as Hybrid Automatic Repeat reQuest (HARQ). The analysis of the throughput and bit-error rate (BER) performance, according to the different constraint lengths and code rate of convolutional codes on HARQ simulation...
The Transport Control Protocol (TCP) has been widely used in wired and wireless Internet applications such as FTP, email and HTTP. However, performances of traditional TCP congestion algorithms degrade significantly when deployed over wireless networks. In this paper, we proposed an improved TCP congestion control algorithm for wireless networks, named TCP-FIT, and compared its performance with existing...
Multi-path is a technique to increase the reliability of the internet connection in IP network. The implementation of this technique can be described as a host with two TCP paths work together, when one of them fails the other will back up the connection. Since TCP does not support multi-homing, the right term for this technique is multi-path. The fairness problem arises when multi-path host uses...
We evaluate various TCP transport protocols on paths over a satellite link. More specifically, we evaluate Reno, Cubic, Compound TCP, Hybla, and a newly proposed Capacity and congestion probing TCP on file transfer applications. Our results show that a single transport protocol delivering best performance on various network scenarios does not yet exist.
The retransmission timeout (RTO) timer used in TCP has long been standardized by the IETF in RFC2988, referred to as the TCP-RFC in this paper. Over the years, various deficiencies have been identified. In this paper, we focus on the implicit RTO offset problem, where the exact timeout limit of each packet is stretched by restarting the timer using the current timer value on the arrival of each acknowledgement...
TCP/IP offload engine (TOE) is an essential technology to increase throughput of network connection. In this paper we present a novel approach for TOE implementation in embedded system with very stringent requirements on area and power. Our approach is based on two design optimizations. The first one deals with architectural enhancement for reducing the size of memory buffers in TOE hardware. The...
The spread use of wireless sensor networks (WSNs) in a variety of fields, ranging from the military to environmental protection, has drawn the attention of researchers to this type of networks. Despite their use in interesting applications, such as healthcare and surveillance, many shortcomings derived from their small size and constrained batteries limit their use, calling for solutions to enhance...
The rapid development of wireless and the advent of fixed mobile convergence have brought deployment of small wireless environment such as femtocell, which can connect Internet or network easily at home and office. Users must be authenticated from the Authentication, Authorization and Accounting (AAA) server to use the Internet or network at home and office. As diameter-based AAA uses TCP/SCTP at...
Protocols such as TCP depend on loss detection and recovery algorithms to provide a reliable data delivery service. TCP detects loss events using either retransmission timeout or receipt of duplicate acknowledgements. Since, TCP does not have any explicit knowledge about the cause of packet loss, it always treats it as a congestion indication and then adjusts sending rate conservatively to maintain...
In recent years, distributed systems are connected by VPN (Virtual Private Network) through the Internet, and construct complicated information systems. These information systems bring benefit and security risks to many users. Representative security risks, vulnerabilities are closely related to application software installed in information systems. If a malicious adversary identifies the application...
Lightweight Congestion Aware Reliable Transport protocol (LCART) is based on cross-layering the prevalent or reciprocal functionalities of Transport, MAC and Wireless-Physical layers in order to achieve energy efficiency and meeting QoS objectives of heterogeneous WSN1 including multimedia. LCART intelligently overcomes network congestion by the simultaneous use of Packet Service Time, Packet Inter...
New Multi-Homed Transport Protocols like Stream Control Transmission Protocol (SCTP) have the potential to be modified for supporting concurrent multi-path multi-homed connections between the end users. This kind of usage will require optimized flow division among the candidate paths in order to utilize the network resources efficiently. This paper considers the problem of optimizing flow division...
This paper investigates the performance enhancement of IEEE 802.11 used in a radio-over-fiber architecture. It is shown that data throughput can be improved by modifying the ACK timeout value and the slottime parameter value defined in IEEE 802.11. In this study, both UDP and TCP packet transmission were taken into account.
Random Early Detection (RED) algorithm, a framework of active queue management (AQM), has been proposed in order to improve the performance of congestion routers due to the increased use of Internet. But, the basic problem of a lag between congestion's occurrence and its remedy remained. To overcome this problem of RED, Explicit Congestion Notification (ECN) proposed by the IETF that allows end-to-end...
In multihop ad hoc networks, TCP cannot effectively deal with the problem of packet drops caused by mobility and shared channel contention among wireless nodes. Mistaking these events for congestion degrades TCP performance. Hence we propose a new end-to-end mechanism, called TCP with Adaptive RTO+ (TCP-AR+), to assure faster recovery after non-congestion induced timeouts. TCP-AR+ comes to enhance...
In this paper, we propose an improvement of truncated ARQ protocol throughput through the optimization of the distribution of the average energy cost per packet (or, equivalently, per symbol) among all packet transmission attempts. We consider exclusively BPSK-modulated ARQ transmission over an AWGN channel, with and without packet combining using the selective repeat as a transmission protocol. Our...
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