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Extending fixed internet with wireless ad-hoc networks

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dc.contributor.author Rakkenes, Sverre en_US
dc.date.accessioned 2015-01-12T10:40:23Z
dc.date.available 2015-01-12T10:40:23Z
dc.identifier.other AIT Thesis no.CS-05-02 en_US
dc.identifier.uri http://www.cs.ait.ac.th/xmlui/handle/123456789/315
dc.description Pathum Thani, Thailand : Asian Institute of Technology, 2005 en_US
dc.description 71 p. : ill. en_US
dc.description.abstract In an office or campus environment, a very common method of connecting computers together is the IEEE 802.11 b/g family, with ba se stations, and hosts connect in managed mode. This is an infrastructured approach, w ith certain limitations. Tests performed in the testbed show that the coverage area of the ba se station is limited, and certain areas of the test bed are not covered by the base st ation. Depending on the location the actual bandwidth varies a great deal and the divers ity of the delay will be significant. An alternative to the infrastructured approach is the ad-hoc approach, where the Mobile ad-hoc network (MANET) is a widely used version of the ad-hoc family. MANETs are usually either not connected to the Internet, or c onnected by a wired service. To increase the coverage area of the managed mode base sta tion, this thesis merges the two styles of wireless networks, in order to draw on the st rengths of both styles. The wireless Internet connection of the managed mode network, and the packet forwarding of the MANET combined in one host . A laptop with two wire less network cards is r unning OLSR with the new Wireless Internet Sharing Plug-in (WISP). One of the ne twork cards is connected to the base station, in the managed mode, the ot her cards is connected to the MANET in the ad-hoc mode. The WISP router can then share its connection to the Intern et with the rest of the MANET. The MANET includes packet fo rwarding, so that th e Internet can be forwarded in multiple hops in the MANET. This thesis tested three different modes, the Managed mode, the WISP ad-hoc mode, and a pure OLSRd wired sharing ad-hoc mode. Running three modes of tests enables the thesis to compare the results of the infrastructured managed mode network to the MANET OLSR WISP implementation, as well as a pure OLSR MANET with a host connected to the In ternet through the LAN. These tests show that the merging of the MANET and the Infras tructured mode can increase the coverage area by more than 100%. The bandwidth of this mode is lower than the managed mode in most locations, but the bandwidth is stable over the whole network, including sites that were outside the coverage are of the mana ged mode. The delay of the WISP network is slightly higher than the manage d mode, but is very stable and shows no locations with very high delay as can be shown in the Managed mode.
dc.relation.ispartof Thesis no. CS-05-02 en_US
dc.relation.ispartof Asian Institute of Technology. Thesis no. CS-05-02 en_US
dc.subject Wireless communication systems en_US
dc.subject Internet en_US
dc.title Extending fixed internet with wireless ad-hoc networks en_US
dc.type Thesis en_US


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