SERVICE PROVIDING SYSTEM AND METHOD IN SATELLITE COMMUNICATION SYSTEM

• US 20110053628A1
• Filed: 08/26/2010
• Published: 03/03/2011
• Est. Priority Date: 08/27/2009
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Ahn, Do-Seob, Lee, Ho-Jin, Kang, Kunseok, Kim, Hee-Wook
• Application Number:
  US12/869,186
• Publication Number:
  US 20110053628A1
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04B 7/18539 Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A service providing method in a satellite communication system includes: confirming positions of terminals when the terminals existing within a service area and intended to receive a service is connected to a satellite base station or a complementary terrestrial component; confirming first terminals, which communicate with the satellite base station, and second terminals, which communicate with the complementary terrestrial component, according to the positions of the terminals; allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals; and providing a service to the terminals by using the allocated resources through multi-beams of the satellite base station and multi-beams of the complementary terrestrial component.

Claims

1. A service providing method in a satellite communication system, comprising:

confirming positions of terminals when the terminals existing within a service area and intended to receive a service is connected to a satellite base station or a complementary terrestrial component;

confirming first terminals, which communicate with the satellite base station, and second terminals, which communicate with the complementary terrestrial component, according to the positions of the terminals;

allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals; and

providing a service to the terminals by using the allocated resources through multi-beams of the satellite base station and multi-beams of the complementary terrestrial component.

2. The service providing method of claim 1, wherein said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals comprises:

dividing the service area into a plurality of beam sectors according to the multi-beams of the satellite base station; and

dividing subcarriers of a usable frequency usable in the service area into a plurality of subcarrier groups.

3. The service providing method of claim 2, wherein, in said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals,

all subcarriers of the usable frequency to center areas of the beam sectors, and the subcarrier groups different from the subcarrier groups allocated to center areas of adjacent beam sectors are allocated to edge areas of the beam sectors, in order for communication through the multi-beams of the satellite base station.

4. The service providing method of claim 2, wherein, in said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals,

the remaining subcarrier groups except for the subcarrier group allocated to an edge area of a predetermined beam sector in order for communication through the multi-beams of the satellite base station are allocated to a center area of the predetermined beam sector among the beam sectors, and the subcarrier group different from the subcarrier groups allocated to an edge area of adjacent beam sectors among the remaining subcarrier groups is allocated to an edge area of the predetermined beam sector, in order for communication through the multi-beams of the complementary terrestrial component.

5. The service providing method of claim 2, wherein said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals comprises dividing a subcarrier of a predetermined frequency band, which is usable when providing the service to the terminals, into a plurality of subcarrier groups.

6. The service providing method of claim 5, wherein, in said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals

all subcarrier groups are allocated to center areas of the beam sectors, and the subcarrier groups different from the subcarrier groups allocated to an edge area of adjacent beam sectors are allocated to edge areas of the beam sectors.

7. The service providing method of claim 5, wherein said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals comprises:

spacing the predetermined frequency band at a predetermined interval, and dividing the subcarrier of the predetermined frequency band into a first subcarrier group and a second subcarrier group at the same frequency band; and

dividing the subcarrier existing in the frequency band of the predetermined interval into a third subcarrier group.

8. The service providing method of claim 7, wherein, in said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals,

the first subcarrier group is allocated in order for communication through the multi-beams of the satellite base station, and

the second subcarrier group and the third subcarrier group are allocated in order for communication through the multi-beams of the complementary terrestrial component.

9. The service providing method of claim 8, wherein said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals comprises:

confirming a terminal which receives a transmission signal through the multi-beams of the satellite base station among the second terminals according to the positions of the second terminals;

allocating the third subcarrier group in order for communication with the terminal which receives the transmission signal; and

allocating the second subcarrier group in order for communication with the terminal which does not receive the transmission signal.

10. The service providing method of claim 1, wherein channel states and Quality of Service (QoS) of the terminals are confirmed by acquiring position information and moving speed information of the terminals through a Global Positioning System (GPS) or information about channels to which the terminals are connected.

11. The service providing method of claim 10, wherein said allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals comprises:

determining a priority according to the channel states and the QoS of the terminals, and selecting an optimal terminal among the terminals; and

determining the coverage size and power of the multi-beams of the satellite base station and the multi-beams of the complementary terrestrial component within the service area according to the channel state of the selected terminal.

12. A service providing system in a satellite communication system, comprising:

a plurality of terminals existing within a service area and connecting the satellite communication system to receive a service;

a satellite base station configured to support a first communication between the satellite communication system and terminals intended to receive the service within the service area, confirm first terminals performing the first communication according to positions of the terminals, form a first multi-beam for performing the first communication, and provide a service to the first terminals through the first multi-beam as a resource usable when communicating with the first terminals; and

a complementary terrestrial component existing within the service area and configured to support a second communication between the terminals and the satellite communication system, confirm second terminals performing the second communication according to positions of the terminals, form a second multi-beam for performing the second communication, and provide a service to the second terminals through the second multi-beam as a resource usable when communicating with the second terminals.

13. The service providing system of claim 12, wherein the satellite base station is configured to divide the service area into a plurality of beam sectors according to the first multi-beam, and divide a subcarrier of a frequency usable in the service area into a plurality of subcarrier groups.

14. The service providing system of claim 13, wherein, in order for the first communication, the satellite base station provides a service by allocating all subcarriers of the usable frequency to center areas of the beam sectors, and provides a service by allocating the subcarrier groups, which are different from the subcarrier groups allocated to center areas of adjacent beam sectors, to edge areas of the beam sectors.

15. The service providing system of claim 13, wherein, in order for the second communication, the satellite base station allocates the remaining subcarrier groups, except for the subcarrier group allocated to an edge area of a predetermined beam sector in order for the first communication, to a center area of the predetermined beam sector among the beam sectors, and allocates the subcarrier group different from the subcarrier groups, which are allocated to an edge area of adjacent beam sectors among the remaining subcarrier groups, to an edge area of the predetermined beam sector, and

the complementary terrestrial component provides a service to the second terminals through the second multi-beam as the allocated subcarrier group.

16. The service providing system of claim 13, wherein the satellite base station is configured to divide a subcarrier of a predetermined frequency band, which is usable when providing the service to the terminals, into a plurality of subcarrier groups, provide the service by allocating all subcarrier groups to center areas of the beam sectors, and provide the service by allocating the subcarrier groups different from the subcarrier groups, which are allocated to an edge area of adjacent beam sectors, to edge areas of the beam sectors, in order for the first communication.

17. The service providing system of claim 16, wherein the satellite base station is configured to space the predetermined frequency band at a predetermined interval, and divide the subcarrier of the predetermined frequency band into a first subcarrier group and a second subcarrier group at the same frequency band, and divide the subcarrier existing in the frequency band of the predetermined interval into a third subcarrier group.

18. The service providing system of claim 17, wherein the satellite base station is configured to provide the service through the first subcarrier group, and

the complementary terrestrial component is configured to confirm a terminal which receives a transmission signal of the satellite base station among the second terminals according to the positions of the second terminals, provide the service through the third subcarrier group to the terminal which receiving the transmission signal, and provide the service through the second subcarrier group to the terminal which does not receive the transmission signal.

19. The service providing system of claim 12, wherein the complementary terrestrial component is configured to confirm channel states and Quality of Service (QoS) of the terminals by acquiring position information and moving speed information of the terminals through a Global Positioning System (GPS) or information about channels to which the terminals are connected.

20. The service providing system of claim 19, wherein the complementary terrestrial component is configured to determine a priority according to the channel states and the QoS of the terminals, select an optimal terminal among the terminals, and determine the coverage size and power of the second multi-beam within the service area according to the channel state of the selected terminal.