Maximizing Lifetime of Wireless Ad Hoc Network
No Thumbnail Available
URL
Journal Title
Journal ISSN
Volume Title
Helsinki University of Technology |
Diplomityö
Checking the digitized thesis and permission for publishing
Instructions for the author
Instructions for the author
Date
2004
Department
Major/Subject
Tietoliikennetekniikka
Mcode
S-72
Degree programme
Language
en
Pages
vii + 48 s. + liitt. 5
Series
Abstract
Battery lifetime becomes an important issue in wireless ad hoc networks since all nodes are mobile and battery powered. Prior to data transfer a communication link is established between source and destination by signalling messages. High density of nodes, coupled with nodes' mobility and lack of central coordination, leads to higher power consumption due to signalling complexity. Efficient network topology with effective signalling method can maximize lifetime of nodes. This work investigates the impact of signalling and its rate on the operational lifetime of the node which has the least energy. For this purpose, the work starts with a lifetime maximization system model where a set of paths between the source and destination is given and the transmission rates, times, and powers of the individual links are controlled among the paths to maximize lifetime of the worst node in an interference limited network. Later in this model, the signalling links having comparatively long distances are being eliminated when the transmission power goes down a certain level. It ensures the elimination of some paths towards destination at relatively low transmission power. The network is also tested with lower signalling rate. The simulation result supports the fact that there is significant effect of signalling on the lifetime of worst node. To improve the lifetime, a network topology has been derived as a function of transmission power of nodes. A case is considered in which new links, therefore new paths, are added to reach the destination with the increase in transmission power of nodes. A simulation result shows the significant improvement of network lifetime using this topology over the fixed network topology developed earlier.Description
Supervisor
Jäntti, RikuThesis advisor
Häggman, Sven-GustavKeywords
ad-hoc-verkot, radioresurssien hallinta