Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion. However, networks with wireless and other lossy links also suffer from significant losses due to bit errors and handoffs. TCP responds to all losses

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When an electronic research succeeds?—when it meets the needs of the people who use it, when it performs flawlessly over a long period of time, when it is easy to modify and even easier to use—it can and does change things for the better. But when it fails—when its results are dissatisfied, when it is error prone, when it is difficult to change and even harder to use—bad things can and do happen.

Abstract — The wireless sensor networks community, has now an increased understanding of the need for realistic link layer models. Recent experimental studies have shown that real deployments have a “transitional region ” with highly unreliable links, and that therefore the idealized perfect

TCP Westwood (TCPW) is a sender-side modification of the TCP congestion window algorithm that improves upon the performance of TCP Reno in wired as well as wireless networks. The improvement is most significant in wireless networks with lossy links, since TCP Westwood relies on endto-end bandwidth

Wireless links have intrinsic characteristics that affect the performance of transport protocols; these include variable bandwidth, corruption, channel allocation delays, and asymmetry. In this paper we review simulation models for cellular, WLAN and satellite links used in the design of transport

that was partially supported by Sprint Corporation. This report presents the problems encountered when standard Internet protocols such as TCP are used over wireless links and advocates the deployment of advanced link layer protocols to mitigate their shortcomings. We discuss both generic and speci

Abstract:- The article presents some problems of optical wireless link (OWL) reliability. The influence of atmosphere on OWL reliability is explained. There are link models from which it is possible to determine a dependability of characteristics. A summary of basic ways of its improvement is given.

We introduce TinySec, the first fully-implemented link layer security architecture for wireless sensor networks. In our design, we leverage recent lessons learned from design vulnerabilities in security protocols for other wireless networks such as 802.11b and GSM. Conventional security protocols

Abstract Capacity of a link is a key metric for network d esig n and manag ement. S ev eral tools for capacity measu rement are present in th e literatu re and th ey prov id e satisfying resu lts wh en u sed ov er wired networks. T h eir performance ov er wireless links, h owev er, is not as g ood