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Method and device for reducing location update procedures in satellite communication systems

A technology of satellite communication system and satellite point, applied in the field of communication

Inactive Publication Date: 2001-04-18
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

performing so many position update procedures puts a lot of pressure on satellite system resources

Method used

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  • Method and device for reducing location update procedures in satellite communication systems
  • Method and device for reducing location update procedures in satellite communication systems
  • Method and device for reducing location update procedures in satellite communication systems

Examples

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Embodiment Construction

[0025] Hereinafter, the present invention will be described in detail while referring to the accompanying drawings, in which preferred embodiments of the invention will be shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments presented herein; rather, these embodiments are presented so that this disclosure will be thorough and complete, and will fully describe the invention. to those skilled in the art. Like numbers refer to like parts throughout the description. As will be apparent to those skilled in the art, the present invention can be implemented as a method or as an apparatus. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment or a combination of software and hardware.

[0026] Figure 2 illustrates a satellite system employing the present invention. Satellite 310 projects spot beams 301 and 302 to provide communication servi...

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Abstract

A user terminal is registered with a satellite communications system including a plurality of satellite spot beam transmitters; wherein each of the satellite spot beam transmitters defines a respective spot beam. A periodic oscillation of two adjacent satellite spot beam transmitters results in a change of geographic coverage for the respective adjacent spot beams so that the user terminal can be alternatingly covered by the first and second spot beams when the user terminal is stationary. Upon determining that the user terminal is alternatingly covered by the first and second spot beams, the user terminal is registered with a spot beam pair for both the first and second adjacent spot beams and the spot beam pair registration is stored in the user terminal memory. Communications operations between the user terminal and the satellite communications system may be terminated and later re-established, whereupon the user terminal reregisters with the spot beam pair registration stored in memory. Related user terminals are also discussed.

Description

field of invention [0001] The present invention relates to the field of communications, and more particularly to systems and methods for satellite communications. Background of the invention [0002] The mobile communication system allows users to access the communication network through corresponding user terminals when moving within a geographical area. Some mobile communication systems divide this geographic area into a number of regions, each of which is covered by a part of the mobile communication system. Therefore, if the user moves from the first area to the second area in the geographical area where the service is obtained, the mobile communication system will stop providing service in the first area and start providing service in the second area, so as to Maintain user access. A user can use a user terminal to access the mobile communication system. [0003] Figure 1A illustrates a satellite system that provides communication services to user terminals 200 withi...

Claims

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Application Information

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IPC IPC(8): H04B7/185
CPCH04B7/1855
Inventor J·科莱夫R·维斯H·林德瓦尔
Owner TELEFON AB LM ERICSSON (PUBL)
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