SYNCHRONIZING A RADIO NETWORK WITH END USER RADIO TERMINALS

• US 20110183606A1
• Filed: 03/24/2011
• Published: 07/28/2011
• Est. Priority Date: 05/21/2001
• Status: Active Grant

• Current Assignee: CSR Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: SIRF Technology Incorporated (Qualcomm, Inc.)
• Inventors: Zhang, Gengsheng, Brown, Jim, Garin, Lionel
• Granted Patent: US 8,437,693 B2
• Time in Patent Office: Days
• US Class Current: 455/13.2
• 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 wireless communications device comprises a communication receiver and a positioning system receiver in the wireless mobile communication device. An absolute time signal is received at the positioning system. A network time signal is received at the communication receiver of the wireless mobile communication device. A controller is in signal communication with the position system receiver and the communication receiver. The controller is configured to determine an offset of the absolute time signal from the network time signal and generates a timing mark. The timing mark is tagged by the positioning system receiver with an internal clock value wherein the timing mark has a known relationship with the absolute time signal. A memory stores the offset of the absolute time signal from the network time signal. A transmitter in the wireless mobile communication device transmits the offset for receipt by another wireless mobile communication device.

Claims

1. A wireless mobile communication device, comprising:

a communication receiver in the wireless mobile communication device;

a positioning system receiver in the wireless mobile communication device;

an absolute time signal received at the positioning system receiver of the wireless mobile communication device;

a network time signal received at the communication receiver of the wireless mobile communication device;

a controller in signal communication with the position system receiver and the communication receiver, where the controller is configured to determine an offset of the absolute time signal from the network time signal, wherein the controller generates a timing mark, the timing mark being tagged by the positioning system receiver with an internal clock value wherein the timing mark has a known relationship with the absolute time signal;

a memory that stores the offset of the absolute time signal from the network time signal; and

a transmitter in the wireless mobile communication device that transmits the offset for receipt by another wireless mobile communication device.

2. The wireless mobile communication device of claim 1, where the absolute time signal is a Global Positioning System (GPS) clock signal.

3. The wireless mobile communication device of claim 1, where the positioning system receiver is a GPS receiver in receipt of the absolute time signal that is a Global Positioning System clock signal.

4. The wireless mobile communication device of claim 3, comprising:

a frequency error of a clock associated with the network time signal is calculated by the controller.

5. The wireless mobile communication device of claim 3, comprising:

a drift rate determination made by the controller based on a plurality of offset measurements.

6. The wireless mobile communication device of claim 1, where the offset is transmitted over another communication network other than a communication network that provides service to the communication receiver.

7. The wireless mobile communication device of claim 3, where the transmitter transmits the offset for receipt by a base station.

8. The wireless mobile communication device of claim 3, where the timing mark has a known relationship with the Global Positioning System clock signal.

9. The wireless mobile communication device of claim 8, comprising:

a frame and a bit number associated with the timing mark being sent to the GPS receiver.

10. The wireless mobile communication device of claim 9, wherein the frame is a GSM frame.

11. A method for wireless communication, comprising:

receiving a network time signal over a first communication network at a communication receiver in a wireless mobile communication device;

receiving an absolute time signal at a positioning system receiver in the wireless mobile communication device;

determining an offset of the absolute time signal from the network time signal by a controller;

storing in a memory the offset of the absolute time signal from the network time signal;

generating a timing mark by the controller;

tagging the timing mark, by the position system receiver, with an internal clock value of the positioning system receiver, wherein the timing mark has a known relationship with the absolute time signal; and

transmitting, by a transmitter in the wireless mobile communication device, the offset for receipt by another wireless mobile communication device.

12. The method for wireless communication of claim 11, where the absolute time signal is a Global Positioning System (GPS) clock signal.

13. The method for wireless communication of claim 11, where the positioning system receiver is a GPS receiver, the method comprising:

receiving the absolute time signal that is a Global Positioning System clock signal.

14. The method for wireless communication of claim 13, comprising:

calculating a frequency error of a clock associated with the network time signal.

15. The method for wireless communication of claim 13, comprising:

determining a drift rate by the controller based upon multiple offset measurements.

16. The method for wireless communication of claim 11, where the offset is transmitted over a second communication network.

17. The method for wireless communication of claim 13, comprising:

transmitting with a transmitter, the offset for receipt by a base station.

18. The method of wireless communication of claim 13, where the timing mark has a known relationship with Global Positioning System clock signal.

19. The method of wireless communication of claim 18, comprising:

sending a frame and a bit number associated with the timing mark to the GPS receiver.

20. An article, comprising:

machine-readable storage medium selected from the group consisting of an optical, a magnetic, and an electrical digital storage device, the machine-readable storage medium comprising machine-readable instructions for;

receiving a network time signal at a communication receiver in a wireless mobile communication device;

receiving an absolute time signal at a positioning system receiver in the wireless mobile communication device;

determining an offset of the absolute time signal from the network signal by a controller;

storing in a memory the offset of the absolute time signal from the network time signal;

generating a timing mark by the controller;

tagging the timing mark, by the positioning system receiver, with an internal clock value of the positioning system receiver, wherein the timing mark has a known relationship with the absolute timing signal; and

transmitting by a transmitter in the wireless mobile communication device the offset for receipt by another wireless mobile communication device.

21. The article of claim 20, where the absolute time signal is a Global Positioning System (GPS) clock signal.

22. The article of claim 20, where the network time signal is a cellular telephone time signal.

23. The article of claim 20, where the positioning system receiver is a GPS receiver the method comprising:

receiving the absolute time signal that is a Global Positioning System clock signal.

24. The article of claim 23, comprising:

machine-readable instructions for calculating a frequency error of a clock associated with the network time signal.

25. The article of claim 23, comprising:

machine-readable instructions for determining a drift rate by the controller based upon multiple offset measurements.

26. The article of claim 20, where the offset is transmitted over another communication network other than a communication network that provides service to the communication receiver.

27. The article of claim 23, comprising:

machine-readable instructions for transmitting with a transmitter in the wireless mobile communication device, the offset for receipt by a base station.

28. The article of claim 23, comprising:

machine-readable instructions for generating a timing mark that the controller tags with an internal clock, where the timing mark has a known relationship with the Global Positioning System Clock Signal.

29. The article of claim 28, comprising:

machine-readable instructions for sending a frame and a bit number associated with the timing mark to the GPS receiver.