Abstract: Method and system for switching a network application operating in a first communication mode to a second mode within a wireless local area network, comprising: judging whether mobile nodes are neighboring according to location information; when nodes are neighboring inquiring whether mobile nodes want to switch to second mode to run network applications; when all mobile nodes agree to switch to second mode, downloading and installing network application provided by the application server to one of the mobile nodes; configuring each of the mobile nodes with the communication parameters under the second mode; and switching all mobile nodes to the second communication mode to continue the previous network application. The invention dynamically switches between Infrastructure mode and Ad-hoc mode to balance system resources, improve QoS, reduce the communication traffic, waiting time and the cost of the users, and increase the income of the provider of the network service.

Abstract: Provides methods, apparatus and system for compressing a large number of continuous location data of moving objects. A large number of continuous location data of moving objects sent from a mobile unit or a locating device are received, these location data are compressed and inserted the compressed location data into a database, so as to solve the problem that the data can not work under a high insertion frequency, and reduce the storage space of continuous locations while maintaining certain location query precision. An example apparatus for compressing the location data of moving objects, comprises: input interface for receiving current location data of a moving continuously; data compressing unit for compressing the location data received via said input interface; and output interface for outputting compressed location data of the moving object.

Abstract: Provides point label placement determining methods, apparatus and systems. A point label placement determining method and system are used in map browsing service based on session mode. In an example embodiment, initial label placement data in a scale is calculated by a static point label determining method. When a user requires a map browsing service, the requirement are met by using an incremental label placement method on the base of said initial label placement data. The incremental point label placement method dramatically reduces the cost for service process. Therefore, the simultaneous requirements of a large number of users can be met. The present invention is successfully used in location based service systems.

Abstract: Provides methods, apparatus and systems for compressing a large number of continuous location data of moving objects. A large number of continuous location data of moving objects sent from a mobile unit or a locating device are received, these location data are compressed and inserted the compressed location data into a database, so as to solve the problem that the database can not work under a high insertion frequency, and reduce the storage space of continuous locations while maintaining certain location query precision. An example apparatus for compressing the location data of moving objects, comprises: input interface for receiving current location data of a object moving continuously; data compressing means for compressing the location data received via said input interface; and output interface for outputting compressed location data of the moving object.

Abstract: The invention relates to the information providing system, information providing device, pervasive device and the method for providing the subscribed service relative to geographical locations. The location information providing device generates a task relating to a subscription service request responsive to the subscription service request on a pervasive device sent from a requester, the pervasive receives the task from the location service information providing device, self-positions and calculates based on the location to execute the task to generate the subscribed information and transmits the generated subscribed information to the requester. The invention makes fully use of the resource of the pervasive device so that the loads among the location service information providing device, the network and the pervasive device included in the location service system are balanced.

Abstract: The present invention provides point label placement determining methods, apparatus and systems. The point label placement determining method and system are used in map browsing service based on session mode. In an example embodiment, initial label placement data in a scale is calculated by a static point label determining method. When a user requires a map browsing service, the requirement are met by using an incremental label placement method on the base of said initial label placement data. The incremental point label placement method dramatically reduces the cost for service process. Therefore, the simultaneous requirements of a large number of users can be met. The present invention is successfully used in location based service systems.