1,721,425 research outputs found
Link Layer Support for Straming MPEG Video over Wireless Links
No full textStreaming video as a form of media is becoming increasingly popular on the Internet. Real-time media such as video requires delay constraints from the network to ensure good quality at the receiver. While watching a video stream on his portable device connected to the Internet through the last-hop wireless link, the mobile user of tomorrow will expect a good experience. But, the time-varying nature of the wireless link can cause video frames to be dropped/delayed, affecting the quality of video at the receiver. In this paper, we propose a link layer approach to improve the quality of MPEG video streaming over a wireless link. We use Bluetooth as the wireless technology on which to test our scheme. Our results show that the quality of streaming video can be substantially improved with our scheme, particularly in bad channel conditions
Mobile Communications and Computing in Challenged Environments: Models, Protocols, Applications
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Urban-X: Towards Distributed Channel Assignment in Cognitive Multi-Radio Mesh Networks
No full textResearches about multi-radio mesh networks have mostly focused on channel allocation under internal interference. However, the deployment of WMNs in unlicensed bands of dense urban areas imposes many challenges regarding co-existence with residential access points. In this paper, we propose Urban-X, which is a first attempt towards a new architecture for MultiRadio Cognitive Mesh Networks. We develop a novel channel assignment that reflects channel and residential traffic state of external users to maximize network throughput. We evaluate our approach using an enhancement of the ns-2 simulator. Urban-X demonstrate the feasibility of our approach and show robustness to variation of channel environment and external user traffic
A Procedure to Evaluate the Mean Transport Time in Multibuffer Deflection-Routing Networks with Nonuniform Traffic
No full textThe use of independence assumptions has made it possible to derive an approximate model of deflection-routing networks that have multibuffer stations and two-connected topologies. A procedure is presented for estimating the mean transport time (and throughput) of these networks, even when the offered traffic is nonuniform. The proposed procedure is efficient and yields very accurate results, as comparisons with simulations have confirmed. The model is quite general and can be applied to deflection-routing networks that deflect packets according to destination-based priorities. The authors have modeled only a few of the several options for designing a deflection-routing network. In particular, they have modeled a network with no user input buffers, a specific admission-routed policy, and destination-based prioritie
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