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In this work, we investigate a new objective measurement for assessing the video playback quality for services delivered in networks that use TCP as a transport layer protocol. We define the new metric as pause intensity to characterize the quality of playback in terms of its continuity since, in the case of TCP, data packets are protected from losses but not from delays. Using packet traces generated...
Erasure control coding has been exploited in communication networks with an aim to improve the end-to-end performance of data delivery across the network. To address the concerns over the strengths and constraints of erasure coding schemes in this application, we examine the performance limits of two erasure control coding strategies, forward erasure recovery and adaptive erasure recovery. Our investigation...
This paper will look at the benefits and limitations of content distribution using Forward Error Correction (FEC) in conjunction with the Transmission Control Protocol (TCP). FEC can be used to reduce the number of retransmissions which would usually result from a lost packet. The requirement for TCP to deal with any losses is then greatly reduced. There are however side-effects to using FEC as a...
There has been considerable research into the performance of the enhanced IEEE 802.11e standard in recent years. Majority of the performance analysis has been based on simulations and analytical models, with little testing done in a real-world environment. We investigate the behaviors of the enhanced distributed channel access (EDCA) and legacy distributed coordination function (DCF) based on a testbed...
Although a number of investigations have been conducted using IEEE 802.11e enabled networks to stream class differentiated video, very few reports are available based on a real testbed. In our work, we set up a wireless testbed for H.264 video streaming through assigning the partitioned video packets onto the DCF MAC layer and different access classes of the EDCA MAC layer. We investigate three assignment...
We investigate the performance of IEEE 802.11e enhanced distributed channel access (EDCA) using real world hardware in a realistic indoor working environment. TCP streams of different priorities representing traffic types, such as FTP are tested over a wireless network test-bed. Quality of service (QoS) metrics such as throughput and delay are calculated directly from a passive capture of the channel...
In this paper we present the results of extensive measurements made over an experimental wired-to-wireless testbed, which consisted of a TCP protocol combined with a real-world indoor IEEE 802.11g WLAN. We investigated the effects of signal attenuation due to client distance from the AP on the 802.11 frame error rates (FER) and consequently on the segment loss rates and retransmission behavior of...
In this paper we investigate the effect of path diversity on the packet loss performance through simulations and experiments using three overlay networks created on top of the PlanetLab testbed. The overlay network consists of a number of relay nodes that are positioned around the Internet. In each of the overlay networks UDP packets are streamed from a client to a destination for a period of 50 days,...
Research into the performance issues of TCP over wireless networks has been the focus of much attention in recent years. Specifically, many homes and offices are now fully equipped with WLAN technologies enabling users and devices to connect to the Internet that predominantly run over TCP for reliable service delivery. It is therefore a common scenario today for TCP segments originating from a TCP...
The complex behaviour of TCP over wireless channels has been the focus of much attention in recent years, and researchers experimenting with TCP are always keen to show the effectiveness of their enhancements by presenting results from many tests over differing network conditions, mainly through the use of popular network simulators, and occasionally through the use wireless testbeds. In this paper...
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