APPARATUS AND METHOD FOR SHARING OF FREQUENCY ALLOCATED FOR MOBILE SATELLITE SERVICE USING SATELLITE AND ITS COMPLEMENTARY GROUND COMPONENT

• US 20100157857A1
• Filed: 09/16/2009
• Published: 06/24/2010
• Est. Priority Date: 12/19/2008
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Ku, Bon Jun, Ahn, Do-Seob
• Application Number:
  US12/560,757
• Publication Number:
  US 20100157857A1
• Time in Patent Office: Days
• US Class Current: 370/281
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00

Abstract

A disclose is a frequency sharing apparatus and method for a mobile satellite service using a satellite and a CGC of the satellite. The frequency sharing method may include measuring a signal strength of a signal received from a satellite, determining a communication mode according to the measured signal strength; and communicating with one of the satellite and a CGC of the satellite, depending on the communication mode.

Claims

1. A satellite mobile terminal, comprising:

a signal strength measuring unit to measure a signal strength of a signal received from a satellite;

a communication mode determining unit to determine a communication mode according to the measured signal strength; and

a communication unit to communicate with any one of the satellite or a complementary ground component (CGC) of the satellite, according to the communication mode.

2. The satellite mobile terminal of claim 1, wherein the communication mode determining unit determines the communication mode as a satellite mode for communicating with the satellite when the measured signal strength is greater than or equal to a predetermined signal value, and determines the communication mode as a ground mode for communicating with the CGC of the satellite when the measure signal strength is less than the predetermined signal value.

3. The satellite mobile terminal of claim 1, wherein the communication unit comprises:

a frequency division duplex (FDD) communication unit to communicate with the satellite in an FDD scheme when the communication mode is the satellite mode; and

a time division duplex (TDD) communication unit to communicate with the CGC of the satellite in a TDD scheme when the communication mode is the ground mode.

4. The satellite mobile terminal of claim 3, wherein the TDD communication unit communicates with the CGC of the satellite in the TDD scheme using a frequency band of a satellite downlink.

5. A CGC of a satellite, comprising:

an FDD communication unit to communicate with the satellite in a FDD scheme; and

a TDD communication unit to communicate with a satellite mobile terminal in a TDD scheme when receiving a signal from the satellite mobile terminal that communicates with the satellite.

6. The CGC of the satellite of claim 5, wherein the TDD communication unit communicates with the satellite mobile terminal in the TDD scheme using a frequency band of the satellite downlink.

7. A communication method of a satellite mobile terminal, comprising:

measuring a signal strength of a signal received from a satellite;

determining a communication mode according to the measure signal strength; and

communicating with any one of the satellite and a CGC of the satellite, according to the communication mode.

8. The method of claim 7, wherein the determining of the communication mode comprises:

determining the communication mode as a satellite mode for communicating with the satellite when the measured signal strength is greater than or equal to a predetermined signal value; and

determining the communication mode as a ground mode for communicating with the CGC of the satellite when the measured signal strength is less than the predetermined signal value.

9. The method of claim 7, wherein the communicating with any one of the satellite and the CGC of the satellite comprises:

communicating with the satellite in a FDD scheme when the communication mode is the satellite mode; and

communicating with the CGC of the satellite in a TDD scheme when the communication mode is the ground mode.

10. The method of claim 9, wherein the communicating with the CGC of the satellite communicates with the CGC of the satellite in the TDD scheme using a frequency band of a satellite downlink.