Extending fixed internet with wireless ad-hoc networks | |
| Author | Rakkenes, Sverre |
| Call Number | AIT Thesis no.CS-05-02 |
| Subject(s) | Wireless communication systems Internet |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. CS-05-02 |
| Abstract | In an office or campus environment, a very common method of connecting computers together is the IEEE 802.11 big family, with base stations, and hosts connect in managed mode. This is an infrastructured approach, with certain limitations. Tests performed in the testbed show that the coverage area of the base station is limited, and certain areas of the test bed are not covered by the base station. Depending on the location the actual bandwidth varies a great deal and the diversity of the delay will he 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 connected by a wired service. To increase the coverage area of the managed mode base station, this thesis merges the two styles of wireless networks, in order to draw on the strengths 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 wireless network cards is running OLSR with the new Wireless Internet Sharing Plug-in (WISP). One of the network cards is connected to the base station, in the managed mode, the other cards is connected to the MANET in the ad-hoc mode. The WISP router can then share its connection to the Internet with the rest of the MANET. The MANET includes packet forwarding, so that the 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 Internet through the LAN. These tests show that the merging of the MANET and the Infrastructured 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 managed mode. The delay of the WISP network is slightly higher than the managed mode, but is very stable and shows no locations with very high delay as can be shown in the Managed mode |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. CS-05-02 |
| Type | Thesis |
| School | School of Advanced Technologies (SAT) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Computer Science (CS) |
| Chairperson(s) | Kanchana Kanchanasut; |
| Examination Committee(s) | Teerapat Sanguankotchakorn;Tsuchimoto, Yasuo; |
| Scholarship Donor(s) | Self Support; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |