Method and apparatus for wireless network timekeeping and synchronization

• US 7,454,217 B2
• Filed: 10/04/2001
• Issued: 11/18/2008
• Est. Priority Date: 10/04/2001
• Status: Expired due to Term

• Current Assignee: CSR Technology Holdings Inc. (Qualcomm, Inc.)
• Original Assignee: Siemens Communications Incorporated (Siemens AG)
• Inventors: Edge, Stephen William, Rehem, Yaser Abdel
• Primary Examiner(s): TIEU, BINH KIEN
• Application Number:
  US09/971,990
• Publication Number:
  US 20030069033A1
• Time in Patent Office: 2,602 Days
• Field of Search: 455/13.2, 455/502, 455/456, 455/517, 455/524, 455/503, 455/456.1, 455/456.5, 455/456.6, 342/357.06, 342/357.1, 342/357.12, 342/357.02, 701/213, 701/214
• US Class Current: 455/502
• CPC Class Codes: H04B 7/2693 Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network

Abstract

A system, method, apparatus, and means for generating timing information in a wireless communication network comprises detecting, at a mobile unit, accurate timing information, wherein the mobile unit is in a cell area serviced by a base station. Association data is generated which associates the accurate timing information with base station timing information maintained by the base station. Network timing information is updated by using or storing the association data. Pursuant to embodiments of the present invention, the association data is stored and maintained at a central network authority from where it may be disseminated to mobile units and base stations in the network.

Claims

1. A method for updating timing information in a wireless communication network of base stations, where each base station maintains timing information, comprising:

receiving, at at least one mobile unit in an area serviced by a base station,

the timing information maintained by the respective base station; and

signal data containing accurate timing information, from a source other than a base station;

deriving accurate timing information from the signal data received at the mobile unit;

for each mobile unit, creating an association comprising the accurate timing information and the timing information received from the base station; and

in response to the association, updating the timing information maintained by at least one base station.

2. The method of claim 1, further comprising providing at least a portion of the association to at least one base station in the wireless communication network.

3. The method of claim 2, providing at least a portion of the association to a plurality of base stations in the wireless communication network.

4. The method of claim 1, where receiving signal data comprises receiving global positioning satellite signal data.

5. The method of claim 4, where receiving global positioning satellite signal data comprises receiving the data via a global positioning satellite antenna or a wireless communications antenna.

6. The method of claim 4, deriving accurate timing information from the signal data comprises deriving the information from the signal data, at the mobile unit.

7. The method of claim 4, further comprising

identifying the base station providing timing information;

forwarding the identity of the base station, the timing information received from the base station, and the accurate timing information derived from the signal data, to a central authority; and

creating the association at the central network authority, where the association further comprises the identity of the base station.

8. The method of claim 4, where deriving accurate timing information from the signal data comprises deriving the information from the signal data, at a central network authority.

9. The method of claim 8, further comprising

identifying the base station providing timing information;

forwarding the identity of the base station, the timing information received from the base station, and the signal data, to the central authority; and

creating the association at the central network authority, where the association further comprises the identity of the base station.

10. The method of claim 1, where

creating an association comprises creating an association at the mobile unit;

and

further comprising providing the association to a central network authority.

11. The method of claim 10, further comprising storing the association at the central network authority.

12. The method of claim 11, further comprising updating the stored association.

13. The method of claim 1, where receiving signal data containing accurate timing information comprises repeatedly receiving signal data.

14. The method of claim 1, where receiving signal data containing accurate timing information comprises selectively receiving signal data.

15. The method of claim 1, further comprising providing the association to another mobile unit.

16. The method of claim 1,

where receiving timing information from the base station comprises receiving propagation delay information;

and

further comprising adjusting the timing information maintained by the base station in response to the propagation delay information.

17. A network timing system for a wireless communication network of base stations where each base station maintains timing information, comprising:

at least one mobile unit in an area served by a base station, the mobile unit comprising

a first receiver comprising means for receiving timing information maintained by the respective base station; and

a second receiver comprising means for receiving signal data from a source other than a base station, the signal data comprising accurate timing information;

a processing device comprising means for deriving accurate timing information from the signal data received at the mobile unit; and

a central network authority comprising

means for receiving the accurate timing information and the timing information received by the mobile unit from the base station;

means for creating an association between the accurate timing information and the timing information received from the base station; and

means, responsive to the association, for updating the timing information maintained by at least one base station.

18. The network timing system of claim 17, where the processing device is located at a mobile unit or the central network authority.

19. The network timing system of claim 17, where the central network authority comprises means for providing at least a portion of the association to a plurality of the base stations.

20. The network timing system of claim 17, where the central network authority further comprises means for providing at least a portion of the association to at least one mobile unit.

21. The network timing system of claim 17, where

the signal data is comprises global positioning satellite signal data;

and

the processing device comprises means for deriving global positioning satellite timing information from the global positioning satellite signal data.

22. The network timing system of claim 21, where the association further comprises the identity of the base station.

23. The network timing system of claim 17,

where the timing information received from the base station further comprises propagation delay information;

and

further comprising means, responsive to the propagation delay information, for adjusting the timing information maintained by the base station.

24. A network timing method for a network comprising a central network authority and a plurality of areas each serviced by at least one base station, where the base station maintains timing information, comprising:

receiving, at a mobile unit in one of the areas,

the timing information maintained by the base station; and

global positioning satellite signal data;

deriving, at the mobile unit or the central network authority, global positioning satellite timing information from the signal data;

creating an association comprising the global positioning satellite timing information and the timing information received from the base station; and

in response to the association, updating the timing information maintained by the base station.