13.07.2015 Views

Page 2 Lecture Notes in Computer Science 2865 Edited by G. Goos ...

Page 2 Lecture Notes in Computer Science 2865 Edited by G. Goos ...

Page 2 Lecture Notes in Computer Science 2865 Edited by G. Goos ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Cartesian Ad Hoc Rout<strong>in</strong>g Protocols ⋆Larry Hughes, Kafil Shumon, and Y<strong>in</strong>g ZhangDepartment of Electrical and <strong>Computer</strong> Eng<strong>in</strong>eer<strong>in</strong>gDalhousie UniversityHalifax, Nova Scotia, B3J 2X4, Canada{larry.hughes,kshumon,yzhang}@dal.caAbstract. As ad hoc networks ga<strong>in</strong> <strong>in</strong> popularity, some of their limitationsare becom<strong>in</strong>g apparent, notably power and bandwidth restrictions.Consequently, it is necessary to utilize protocols that reduce power consumption,reduce traffic, and restrict flood<strong>in</strong>g. In this paper, two adaptive,connectionless protocols and their support<strong>in</strong>g subsystems are described.The protocols, when used with directional antennas, can reducethe number of nodes <strong>in</strong>volved <strong>in</strong> a transmission, there<strong>by</strong> address<strong>in</strong>g theissue of power consumption and bandwidth utilization.Keywords: MANET, location awareness, direction awareness.1 IntroductionA mobile ad hoc network (MANET) is a collection of wireless mobile nodesthat are capable of communicat<strong>in</strong>g with each other without the use of a network<strong>in</strong>frastructure or any centralized communication [1]. Like most wirelessnetworks, a MANET is both power and bandwidth sensitive. Communication <strong>in</strong>a MANET poses special challenges because the network is <strong>in</strong>frastructureless andtopologically dynamic. Energy conservation also plays an important role <strong>in</strong> theperformance of ad hoc networks s<strong>in</strong>ce most mobile hosts are battery operated.In a relatively dense network with many nodes ly<strong>in</strong>g between the source andthe dest<strong>in</strong>ation, these two problems become even more prom<strong>in</strong>ent. A numberof MANET protocols have been proposed, <strong>in</strong>clud<strong>in</strong>g on-demand protocols forsav<strong>in</strong>g bandwidth, such as DSR [2] and CBRP [3], and for power sav<strong>in</strong>g, suchas power-aware localized rout<strong>in</strong>g [4] and energy conserved rout<strong>in</strong>g [5].Cartesian Ad hoc Rout<strong>in</strong>g Protocols (CARPs) are a set of three adaptive,connectionless protocols that address the problems of rout<strong>in</strong>g and power consumption<strong>in</strong> MANETs; they are loosely based on the Cartesian Rout<strong>in</strong>g Protocol[6]. Each protocol operates at the physical layer (us<strong>in</strong>g directional antennas) andthe network layer (through its adaptive protocols); all nodes are location anddirection aware. The protocols designed for CARP have three objectives: restrictflood<strong>in</strong>g, reduce power consumption, and reduce traffic. Due to space restrictionsonly two of the protocols are presented <strong>in</strong> this paper.⋆ This research is supported <strong>by</strong> an Atlantic Innovation Fund research grant as part ofthe <strong>Computer</strong> Networks and Services Research programme.S. Pierre, M. Barbeau, and E. Kranakis (Eds.): ADHOC-NOW 2003, LNCS <strong>2865</strong>, pp. 287–292, 2003.c○ Spr<strong>in</strong>ger-Verlag Berl<strong>in</strong> Heidelberg 2003

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!