Electronics and Telecommunications Research Institute

Ktfreetel Co., Ltd

Sang Woo Nam

Jae Su Song

Pyeong Jung Song

Yeon Seung Shin

Soon Gi Park

Hyung Sub Kim

Won Ik Kim

Dong Chin Woo

Bong Ju Lee

A handover method and apparatus for a mobile terminal using location information in a network of heterogeneous systems are provided. The handover method uses service area map information provided by a location service server in a mobile communication network in which at least one or more heterogeneous wireless network systems are connected through a predetermined network and, includes: receiving service area map information transmitted from the location service server; the mobile terminal determining whether or not the location of the mobile terminal is within the service area map; and if it is determined that the mobile terminal is within the service area map, the wireless terminal selecting an accessible wireless network system and then activating a unit for communicating with a base station of the selected wireless network system. According to the method, a battery consumption problem that occurs by activating all modems when a wireless terminal, which is connected to a predetermined mobile communication system in an environment where a plurality of heterogeneous systems are overlapping each other, is searching for candidate systems in order to perform handover to a heterogeneous network, can be solved. Also, a problem where finding a candidate system is time-consuming can be solved.

Handover method and apparatus for mobile terminal using location information in heterogeneous system network

This invention provides a method for searching the shortest path between two points in a geographics information system. In a postal route system and method for fast algorithm of the shortest path search with direction in the same according to the present invention, in order to serve an application service associated with the method for fast algorithm of the shortest path search, a map and an associated information are constituted by a database through which the process to generate the shortest path is performed so that it is possible to provide services utilized in such as postal delivery, transport information system and general road information guide which require the information on the shortest distance.

Postal route system and method for fast algorithm of the shortest path

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Daejeon, South Korea

Sang Woo Nam