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Proactive QoS Routing in Ad Hoc Networks 71– Compared to the data packet load, the additional overhead the QoS OLSR versionsintroduce use a large amount of link bandwidth. This overhead is relatively independentof the nominal link bandwidth. We plan to explore whether the use of 802.11b,with up to 11 Mbps data rate, reduces the added network load and the resulting negativeeffect on the delivery ratio and delay.AcknowledgementsThis work is funded by the Defense Research and Development Canada (DRDC) andbenefited from various discussions with members of the CRC RNS mobile networkinggroup.References1. G. S. Ahn, A. T. Campbell, A. Veres and L. H. Sun, "SWAN: Service Differentiation inStateless Wireless Ad-Hoc Networks", IEEE Computer and Communications Societies,2002, pages 457-466, June 20022. G. Apostolopoulos, R. Guerin, S. Kamat, and S. K. Tripathi, “Quality of Service BasedRouting: A Performance Perspective”, Association for Computing Machinery's Special InterestGroup on Data Communication ’98, pages 17-28, September 19983. S. Chen and K. Nahrsted, "Distributed Quality-of-Service Routing in Ad-Hoc Networks",IEEE Journal on Selected Areas in Communications, Vol. 17, No. 8, August 1999, pages1488-15054. S. Chen and K. Nahrstedt, “An Overview of Quality-of-Service Routing for the NextGeneration High-Speed Networks: Problems and Solutions”, IEEE Network Magazine,Vol.12, No.6, pages 64-79, November 19985. Y. Ge, T. Kunz and L. Lamont, “Quality of Service Routing in Ad-Hoc Networks UsingOLSR”, Proceeding of the 36 thHawaii International Conference on System Sciences(HICSS-36), Hawaii, USA, January 2003, ISBN 0-7695-1874-5, IEEE 2003.6. R. Guerin and D. Willimas, “Qos Routing Mechanisms and OSPF Extensions”, draft-qosrouting-ospf-00.txt”,Internet-Draft, Internet Engineering Task Force, November 19967. Iwata, C. C. Chiang, G. Pei, M. Gerla and T. Chen, "Scalable Routing Strategies for Ad-Hoc Wireless Networks”, IEEE Journal on Selected Areas in Communications, Vol.17,No.8, pages 1369-1379, August 19998. P. Jacquet, P. Muhlethaler, A. Qayyum, A. Laouiti, L. Viennot, T. Clauseen, "OptimizedLink State Routing Protocol draft-ietf-manet-olsr-05.txt", INTERNET-DRAFT, IETFMANET Working Group9. C. R. Lin and J. S. Liu, “QoS Routing in Ad-Hoc Wireless Networks”, IEEE Journal OnSelected Areas In Communications, Vol.17, No.8, pages 1426-1438, August 199910. R. Ramanathan and M. Steenstrup, “Hierarchically-Organized, Multihop Mobile WirelessNetworks for Quality-of-Service Support”, Mobile Networks and Applications, Vol.3,pages 101-119, 199811. P. Sinha, R. Sivakumar and V. Bharghanan, "CEDAR: a Core-Extraction Distributed Ad-Hoc Routing Algorithm”, IEEE Journal on Selected Areas in Communications, Vol. 17,No. 8, August 1999, pages 1454-1465
Delivering Messagesin Disconnected Mobile Ad Hoc NetworksRitesh Shah and Norman C. HutchinsonDepartment of Computer Science, University of British Columbia{rshah,norm}@cs.ubc.caAbstract. Many routing protocols for mobile ad hoc networks havebeen developed. These protocols find a route to a destination if such aroute exists. We present a novel protocol that delivers messages betweendisconnected hosts, that is, when no route exists between them. Ourprotocol uses the nodes moving between the neighbourhoods of the sourceand destination nodes to act as carriers of the messages. We describe theprotocol in detail, provide an initial simulation-based evaluation of itsperformance compared to both a naive scheme and the optimal scheme,and discuss some extensions to the protocol that we are exploring.1 IntroductionAn ad-hoc network is a self-starting network formed on-the-fly by a group ofmobile nodes without the aid of any centralized administration or establishedinfrastructure. Ad-Hoc networks find their use in situations where no fixed wiredinfrastructure is available or has been damaged by natural or man-made disaster.Rapid advancement in wireless technology and increasingly affordable pricesof wireless devices have made ad-hoc networks a reality. This has fuelled a lot ofresearch activity in the field. Several protocols [1], [5], [6] have been developed tofind and maintain routes between the nodes of an ad-hoc network. These routingprotocols can be divided into three broad categories. First are the pro-activeprotocols, that use periodic advertisements to broadcast routing information,such as DSDV [2]. Second are on-demand protocols, that search for routes ondemand,such as AODV [4] and DSR [3]. Third are those routing protocols thatuse a hybrid approach, which is a combination of the first two approaches. Whileeach approach has its advantages and disadvantages in finding a route betweentwo mobile hosts when one exists, none of them handle the case of messagedelivery between two disconnected hosts.Links in a MANET (Mobile Ad-Hoc Network) are susceptible to frequentbreakage due to movement of nodes. This may cause some nodes to get disconnectedfrom others. A message destined to such a disconnected node results ina delivery failure irrespective of the routing protocol used. Different protocolshandle this situation differently but at most they invalidate the route, if therewas one already in use and inform the source about the situation.Why is the question of message delivery among disconnected hosts important?Consider a disaster relief scenario. Relief workers are working on severalS. Pierre, M. Barbeau, and E. Kranakis (Eds.): ADHOC-NOW 2003, LNCS 2865, pp. 72–83, 2003.c○ Springer-Verlag Berlin Heidelberg 2003
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Lecture Notes in Computer Science 2
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PrefaceAd Hoc Networks are wireless
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3BerlinHeidelbergNew YorkHong KongL
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Table of ContentsSpace-Time Routing
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Author IndexAlonso, G. 104Bachir, A
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