Method of acquiring initial GPS signal in broadcasting system and system using the method

• US 7,719,465 B2
• Filed: 10/09/2006
• Issued: 05/18/2010
• Est. Priority Date: 10/06/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Park, Chan-Woo, Yoon, Jae-Seung, Kim, Hak-Ryoul, Son, Hyung-Chul
• Primary Examiner(s): PHAN, DAO LINDA
• Application Number:
  US12/089,478
• Publication Number:
  US 20090267831A1
• Time in Patent Office: 1,317 Days
• Field of Search: 342/357.03, 342/357.05, 342/357.06, 342/357.09, 342/357.15, 701/207, 701/213, 701/215
• US Class Current: 342/357.31
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: H04H 60/51 of receiving stations
• CPC Class Codes: H04H 60/54 where broadcast information is generated

Abstract

A system and method for acquiring an initial Global Positioning System (GPS) signal in a communication system including a terminal. The system includes an Assisted GPS (AGPS) server for generating Acquisition Assistance (AA) data distinguished according to an area based on a pre-set position of each service area, a transmitting station for broadcasting the generated AA data to terminals, and the terminals for acquiring an initial GPS signal by receiving the broadcasted AA data. In addition, the method includes the steps of generating AA data distinguished according to an area based on a pre-set position of each service area, broadcasting the generated AA data to terminals, and acquiring, by each of the terminals, a GPS signal by receiving the broadcasted AA data.

Claims

1. A Digital Multimedia Broadcasting (DMB) system for providing a service by dividing an entire broadcasting service area into a plurality of areas, the DMB system comprising:

an Assisted Global Positioning System (AGPS) server for generating Acquisition Assistance (AA) data that is distinguished by area based on a pre-set position in each of the plurality of areas;

a transmitting station for broadcasting the AA data; and

at least one terminal for acquiring an initial GPS signal by receiving the broadcasted AA data.

2. The DMB system of claim 1, wherein the AGPS server generates the AA data by calculating a code phase and a Doppler frequency of each GPS satellite based on the pre-set position in each of the plurality of areas.

3. The DMB system of claim 1, wherein the at least one terminal searches for a corresponding area based on data previously received from a gap filler and acquires a GPS signal using data corresponding to the corresponding area among the received AA data.

4. The DMB system of claim 1, wherein the AA data comprises:

a GPS time field indicating time determined based on the GPS signal;

a Satellite Vehicle Pseudo Random Number (SV PRN) field indicating code information for identifying each GPS satellite; and

a code phase and Doppler frequency field for acquiring the GPS signal.

5. The DMB system of claim 4, wherein the AA data further comprises an area identifier (ID) indicating information indicating the pre-set position used as a reference in each of the plurality of areas.

6. The DMB system of claim 1, wherein the transmitting station periodically broadcasts the AA data.

7. A method of acquiring an initial Global Positioning System (GPS) signal in a Digital Multimedia Broadcasting (DMB) system for providing a service by dividing an entire broadcasting service area into a plurality of areas, the method comprising the steps of:

generating Acquisition Assistance (AA) data that is distinguished by area based on a pre-set position in each of the plurality of areas;

broadcasting the generated AA data; and

acquiring by at least one terminal a GPS signal by receiving the AA data.

8. The method of claim 7, wherein the step of generating AA data comprises:

calculating a code phase and a Doppler frequency of each GPS satellite based on the pre-set position in each of the plurality of areas; and

inserting the calculated code phase and Doppler frequency information into the AA data and broadcasting the AA data to the terminals.

9. The method of claim 7, wherein the step of broadcasting the generated AA data comprises:

determining, by the at least one terminal, a corresponding area based on data previously received from a gap filler; and

searching for a GPS signal using data corresponding to its area among the received AA data.

10. The method of claim 7, wherein the AA data comprises:

a GPS time field indicating time determined based on the GPS signal;

a Satellite Vehicle Pseudo Random Number (SV PRN) field indicating code information for identifying each GPS satellite; and

a code phase and Doppler frequency field for acquiring the GPS signal.

11. The method of claim 10, wherein the AA data further comprises an area identifier (ID) indicating information indicating the pre-set position used as a reference in each of the plurality of areas.

12. The method of claim 7, wherein the AA data is periodically broadcasted to the at least one terminal.

13. A terminal of a Digital Multimedia Broadcasting (DMB) system for providing a service by dividing an entire broadcasting service area into a plurality of areas, the terminal comprising:

a broadcasting receiving part for receiving a DMB signal including Acquisition Assistance (AA) data distinguished by area based on a pre-set position in each of the plurality of areas; and

a Global Positioning System (GPS) receiving part for acquiring an initial GPS signal based on the received AA data.

14. The terminal of claim 13, wherein the broadcasting receiving part comprises:

a DMB signal receiver for receiving the DMB signal;

a DMB channel decoder for extracting the AA data from the DMB signal; and

an AA data processing unit for receiving and storing the AA data and transmitting the stored AA data to the OPS receiving part when the AA data is requested from the GPS receiving part.

15. The terminal of claim 14, wherein the GPS receiving part comprises:

a GPS signal receiver for requesting the AA data processing unit for AA data of relevant GPS satellites and searching for a GPS signal using the AA data received from the AA data processing unit; and

a position determiner for determining a position of the terminal using the found result.

16. The terminal of claim 13, wherein the broadcasting receiving part comprises:

a DMB signal receiver for receiving the DMB signal;

a DMB channel decoder for extracting the AA data, which includes a gap filler identifier (ID) indicating each service area, from the DMB signal;

an area determiner for extracting area information based on the gap filler ID received from the DMB channel decoder and storing the extracted area information; and

an AA data processing unit for transmitting AA data to the GPS receiving part based on an area ID of currently received AA data and the area information previously stored in the area determiner when AA data is requested from the GPS receiving part.

17. The terminal of claim 16, wherein the area determiner comprises a table comprising the gap filler ID and an area corresponding to the gap filler ID.

18. The terminal of claim 16, wherein the area determiner extracts the area information using an area ID included in the AA data.

19. The terminal of claim 16, wherein the GPS receiving part comprises:

a GPS signal receiver for requesting the AA data processing unit for AA data of relevant GPS satellites and searching for a GPS signal using the AA data received from the AA data processing unit; and

a position determiner for determining a position of the terminal using the found result.

20. A method of acquiring an initial Global Positioning System (GPS) signal in a terminal of a Digital Multimedia Broadcasting (DMB) system for providing a service by dividing an entire broadcasting service area into a plurality of areas, the method comprising the steps of:

extracting AA data, which is distinguished by area based on a pre-set position in each of the plurality of areas, by receiving a DMB signal; and

acquiring an initial GPS signal based on the extracted AA data.

21. The method of claim 20, wherein the step of extracting AA data comprises:

determining an area corresponding to the location of the terminal based on an area Identifier (ID) indicating area information among data previously received from a gap filler; and

extracting data corresponding to the area ID from the received AA data.