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This work aims at building iPath - a path-selection system for multi-homed mobile hosts that assists vertical handoff. Unlike existing systems, iPath selects the access network interface for communications based on end-to-end path properties (e.g., available bandwidth, delay, packet loss rate, and jitter). iPath also adopts a new metric for handoff - “switching cost”, which is caused by the congestion...
In the first part of this paper we discuss the possibility of developing multi-stream (multi)point-to-(multi)point data transport protocols with low-priority behavior towards other communication flows and which fill the upload bandwidth efficiently. We propose and evaluate a multi-stream data transfer protocol which aims to achieve these goals. In the second part of the paper we discuss several problems...
New rate control schemes are necessary for Internet streaming flows to smoothly use the available bandwidth. To equally share the Internet bandwidth with existing TCP flows, these schemes should meet the TCP-equivalent criterion, i.e. the same rate as TCP under the same network conditions. This work proposes a window-averaging rate control (WARC) scheme to sends packets at the average rate that a...
Most of future digital services for home and office users will be deployed and delivered through the Internet and wireless connectivity. However, employing regular access points (APs) and protocols will not allow an efficient coexistence among heterogeneous application flows. Indeed, real-time and elastic applications are (and will be) supported by different protocols and featured with different performance...
In our previous work, we have proposed a block device layer called BDL-APT (Block Device Layer with Automatic Parallelism Tuning), which maximizes the performance of heterogeneous IP-SAN protocols in a long-fat network. In this paper, we evaluate the performance of BDL-APT with heterogeneous IP-SAN protocols (i.e., iSCSI, NBD and GNBD) in a long-fat network. We implemented BDL-APT as a layer of MD...
According to different priority based services, IEEE 802.16e WiMAX standard classifies packets as UGS, RTPS, eRTPS, nRTPS, BE. The standard treats all packets generated while browsing the internet as delay tolerant packets and classifies them as Best Effort (BE) packets. This includes BE packets generated while browsing secure websites. However, secure transactions are governed by time constraints...
This paper proposes a remote thin client system for real time multimedia streaming over VNC. A remote frame can be split as two parts, i.e. high motion part and low motion part, and transmitted through the Internet from servers to clients according to the proposed hybrid RTP protocol. A Dynamic Image Detection Scheme (DIDS) is proposed to automatically detecting the high motion part of a frame with...
TCP has been a congestion control method in the Internet. However, since TCP is not able to directly measure the network status from the end nodes, the TCP window control gradually increases the congestion window size until congestion occurs. This control gets network bandwidth aggressively and affects communication of all stations (STAs) which belong to the same access point of IEEE 802.11 standards...
In this paper, we study the performance of active queue management algorithms for packet queueing in Internet routers in the presence of new versions of the TCP congestion control mechanism. In particular, we compare the performance of tail drop, adaptive RED, AVQ, PI, REM and AN-AQM queueing in four TCP cases: (i) the classic New Reno protocol, (ii) the Sack protocol, (iii) the Fack protocol, (iv)...
This paper presents the definition of NCS data stream in theory, divides streams into five categories and describes with the definition above. TCP and UDP delay model for internet-based NCS are constructed. An Internet measure model based on the Transit-Stub structure which was used in router analysis is presented. Finally, we make an experiment to validate the model above, and give a suggestion of...
In Ad Hoc network, transport protocol design is appearing to the research surface with quite innovative conceptions. TCP, a widely used protocol in the wired world, is not suitable for Ad Hoc Networks. To prevail over this problem researchers have provided many solutions that are either variants of TCP or independent of TCP. ATP is one of the protocols designed for ad hoc network independent of TCP...
The problem how to improve the quality of server(QoS) of the heterogeneous network must be studied and solved, for long round trip times (RTTs), not negligible packet error rates (PER), and downlink-uplink asymmetry, etc. Posing new challenges to the QoS given by transmission control protocol (TCP). the paper proposes a Diff-selective(diff-sel) policy, which can solve the problem by selecting different...
The performance of category 5e and category 6 cabling systems is compared for both IPv4 and IPv6 using Gigabit Ethernet LAN. The maximum bandwidth achieved over Gigabit Ethernet was 700Mbps and it was for IPv4 and category 5e cabling. IPv4 and IPv6 resulted in better TCP and UDP throughput on Category 5e than it did with Category 6.
In this paper, we present the Fair Early Drop (FED) scheme which aims to prevent the unfairness problem generated by unresponsive flows and treat the various kinds of transport traffic “fairly”. Unresponsive flows are managed by making sure they do not consume more than their fair share of network resources; that is, by dropping more packets from them. The dropping decision is simple with O(1) complexity...
Gradually, Voice over Internet Protocol (VoIP) has been dominating the telecommunications world. Unfortunately, its applications are injecting a huge number of small packets in the network, which produces high overhead and therefore wastes network bandwidth. This paper proposed the use of a novel multiplexing technique, Delta-Multiplexing, to save the wasted bandwidth. In the Delta-Multiplexing technique,...
This paper aims to revisit the TCP congestion window model already proposed in the literature, and discusses some of its parameters in wired-cum-wireless networks. Clearly, an enhancement of the above mentioned model is proposed following new variants of TCP designed to work in such environments. This issue led us to derive a model estimating the effective throughput of TCP in such environments, which...
This paper proposes a new TCP congestion control supporting loss-fairness, which also contributes to improving RTT fairness. It has been well known that smaller RTT flows grab more bandwidth than larger ones when they compete on the shared link. This is called RTT unfairness and is caused by congestion control mechanism of the current TCP. To solve this problem, many protocols have been proposed....
In high-speed and long-distance networks, TCP NewReno, which is the most popular version of TCP, cannot achieve sufficient throughput because of the essential nature of the congestion control mechanism of TCP. Therefore, Compound TCP has been proposed. Compound TCP can achieve a considerably larger throughput than TCP NewReno in high-speed and long-distance networks. The congestion control mechanism...
Transport protocols have been developed at first for terrestrial networks, but they are also used on communication satellite networks which have specific characteristics such as low bandwidth, QoS architecture and large latency. TCP and SCTP have been intensively studied in several circumstances, recommendations have been provided and results obtained. We are going to use the research done in order...
IP multicast has proved to be the best approach for large scale multimedia communications enhancing video transmissions for applications like IPTV, video conferencing or other best-effort real-time audio/video applications. IP multicast connectivity, unfortunately, relays on certain network technologies and protocols and is present only in some areas of the Internet, while the majority of hosts lack...
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