Quality of Service in Mobile Ad Hoc Networks
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Editorial Quality of Service in Mobile Ad Hoc Networks Wei Li,1 Mohsen Guizani,2 and Demetrios Kazakos3 1 Department
of Electrical Engineering and Computer Science, University of Toledo, Toledo, OH 43606, USA of Computer Science, Western Michigan University, Kalamazoo, MI 49008, USA 3 Department of Electrical and Computer Engineering, University of Idaho, Moscow, ID 83844, USA 2 Department
Received 10 April 2006; Accepted 10 April 2006 Copyright © 2006 Wei Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Mobile ad hoc networking is a challenging task due to the lack of resources residing in the network as well as the frequent changes in network topology. Although much research has been directed to supporting quality of service (QoS) in the Internet and traditional wireless networks, present results are not suitable for mobile ad hoc network (MANET). QoS support for mobile ad hoc networks remains an open problem, drawing interest from both academia and industry under military and commercial sponsorship. MANETs have certain unique characteristics that pose several difficulties in provisioning QoS, such as dynamically varying network topology, lack of precise state information, lack of central control, error-prone shared radio channels, limited resource availability, hidden terminal problems, and insecure media, and little consensus yet exists on which approaches may be optimal. Future MANETs are likely to be “multimode” or heterogeneous in nature. Thus, the routers comprising a MANET will employ multiple, physical-layer wireless technologies, with each new technology requiring a multiple access (MAC) protocol for supporting QoS. Above the MAC layer, forwarding, routing, signaling, and admission control policies are required, and the best combination of these policies will change as the underlying hardware technology evolves. In response to the above demand for mobile ad hoc networks, this special issue aims at providing a timely and concise reference of the current activities and findings in the relevant technical fields, and focuses as well on the state-ofthe-art and up-to-date efforts in design, performance analysis, implementation and experimental results for various QoS issues in MANETs. We believe that all of these papers not only provide novel ideas, new analytical models, simulation and experimental results, and handful experience in this field, but also simulate the future research activities in the area of the quality of
service for mobile ad hoc networks. A brief summary of each paper is listed as follows. The first paper by Qi He et al. first identifies two critical issues leading to the TCP performance degradation: (1) unreliable broadcast, since broadcast frames are transmitted without the request-to-send and clear-to-send (RTS/CTS) dialog and Data/ACK handshake, so they are vulnerable to the hidden terminal problem; and (2) false l
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