Design and Implementation of Geographical Handoff System Using GPS Information 


Vol. 35,  No. 1, pp. 33-43, Jan.  2010


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  Abstract

Recently, users want to use real-time multimedia services, such as internet, VoIP, etc., using their IEEE 802.11 wireless lan mobile stations. In order to provide such services, a handoff among access points is essential to support the mobility of a node, in such an wide area. However, the legacy handoff methods of IEEE 802.11 technology are easy to lose connections. Also, the recognition of a disconnection and channel re-searching time make the major delay of the next AP to connect. In addition, because IEEE 802.11 decides the selection of an AP depending only on received signal strength, regardless of a node direction, position, etc., it cannot guarantee a stable bandwidth for communication. Therefore, in order to provide a real-time multimedia service, a node must reduce the disconnection time and needs an appropriate algorithm to support a sufficient communication bandwidth. In this paper, we suggest an algorithm which predicts a handoff point of a moving node by using GPS location information, and guarantees a high transmission bandwidth according to the signal strength and the distance. We implemented the suggested algorithm, and confirmed the superiority of our algorithm by reducing around 3.7㎳ of the layer-2 disconnection time, and guaranteed 24.8% of the communication bandwidth.

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  Cite this article

[IEEE Style]

S. Han, S. Yang, J. Kim, "Design and Implementation of Geographical Handoff System Using GPS Information," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 1, pp. 33-43, 2010. DOI: .

[ACM Style]

Seung-ho Han, Seung-chur Yang, and Jong-deok Kim. 2010. Design and Implementation of Geographical Handoff System Using GPS Information. The Journal of Korean Institute of Communications and Information Sciences, 35, 1, (2010), 33-43. DOI: .

[KICS Style]

Seung-ho Han, Seung-chur Yang, Jong-deok Kim, "Design and Implementation of Geographical Handoff System Using GPS Information," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 1, pp. 33-43, 1. 2010.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880