Fast traffic channel reconnection system and method

• US 7,062,263 B2
• Filed: 05/08/2003
• Issued: 06/13/2006
• Est. Priority Date: 05/08/2002
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Via Telecom Co., Ltd.
• Inventors: Lee, Anthony
• Primary Examiner(s): Gary, Erika A.
• Assistant Examiner(s): CAI, WAYNE HUU
• Application Number:
  US10/434,416
• Publication Number:
  US 20040005883A1
• Time in Patent Office: 1,132 Days
• Field of Search: 455/33.2, 455/34.1, 455/54.1, 455/574, 455/442, 455/343.2, 455/422.1, 455/434, 455/450, 455/435.1, 455/425
• US Class Current: 455/422.1
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

A method and apparatus for reducing call setup latency for a wireless device in a cellular network where the wireless device receives, stores, and analyzes base station overhead information to reduce the need to perform initialization after a call session terminates.

Claims

1. A system for communicating data signals using a cellular network, comprising:

a plurality of base stations coupled to the cellular network, each base station of the plurality of base stations including means for transmitting base station overhead information; and

a wireless device coupled to the cellular network, the wireless device including;

a) means for performing base station acquisition initialization steps including acquiring a pilot signal from and establishing synchronization with at least an initialization one of the plurality of base stations while in a base station acquisition initialization state;

b) means for conducting a first call session with at least one of the plurality of base stations after performing the base station acquisition initialization steps and exiting the base station acquisition initialization state of means (a);

c) means for receiving the base station overhead information;

d) means for storing the received base station overhead information;

e) means for processing the received base station overhead information to determine whether the received base station overhead information is current for one of the plurality of base stations after a call session is completed; and

f) means for beginning a second call session with at least one of the plurality of base stations subsequent to conducting the first call session and prior to reentering the base station acquisition initialization state of means (a).

2. The system of claim 1, wherein the base station acquisition initialization means (a) of the wireless device further functions to acquire a synchronization channel and a system clock of the initialization base station.

3. The system of claim 2, wherein the wireless device maintains an active base station set that includes a sub-set of the plurality of base stations.

4. The system of claim 3, wherein at least one of the plurality of base stations includes means for transmitting overhead information for each base station in the active base station set when a call session ends.

5. The system of claim 4, wherein the cellular network is a CDMA based network and wherein the base station overhead information includes at least one of the following overhead parameters:

a Pseudorandom Noise Offset, a CDMA channel number, a CDMA Band Class, a Station Identifier, a Network Identifier pair, a Protocol Revision, a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

6. The system of claim 4, wherein the cellular network is a CDMA based network and wherein the overhead information includes at least one of the following BCCH overhead parameters:

a BCCH code channel, a BCCH data rate, and a BCCH coding rate.

7. The system of claim 4, wherein the cellular network is a CDMA based network and wherein the overhead information includes at least one of the following PCH overhead parameters:

a PCH code channel and a PCH data rate.

8. The system of claim 7, wherein the processing means determines whether the PCH overhead parameters for a base station are current.

9. The system of claim 4, wherein the cellular network is a CDMA based network and wherein the overhead information includes at least one of the following overhead parameters:

a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

10. The system of claim 9, wherein the processing means determines whether BCCH overhead parameters for a base station, including the BCCH code channel, the BCCH data rate, and the BCCH coding rate, are current.

11. A wireless device for communicating data signals using a cellular network, the cellular network including a plurality of base stations coupled to the cellular network, comprising:

a) means for initializing base station acquisition with at least an initialization one of the plurality of base stations through a base station acquisition initialization process that includes acquiring a pilot signal from and establishing synchronization with the initialization base station;

b) means for conducting a first call session with at least one of the plurality of base stations after completing the base station acquisition initialization process;

c) means for receiving base station overhead information;

d) means for storing the received base station overhead information;

e) means for processing the received base station overhead information to determine whether the received base station overhead information is current for one of the plurality of base stations after a call session is completed; and

f) means for beginning a second call session with one of the plurality of base stations following step

(b) and prior to performing a further base station acquisition initialization process.

12. The wireless device of claim 11, wherein the base station acquisition initializing means (a) of the wireless device further functions to acquire a synchronization channel and a system time of the initialization base station.

13. The wireless device of claim 12, wherein the wireless device maintains an active base station set that includes a sub-set of the plurality of base stations.

14. The wireless device of claim 13, wherein the means for receiving base station overhead information includes means for receiving overhead information for each base station in the active base station set when a call session ends.

15. The wireless device of claim 14, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following overhead parameters:

a Pseudorandom Noise Offset, a CDMA channel number, a CDMA Band Class, a Station Identifier, a Network Identifier pair, a Protocol Revision, a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

16. The wireless device of claim 14, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following BCCH overhead parameters:

a BCCH code channel, a BCCH data rate, and a BCCH coding rate.

17. The wireless device of claim 14, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following PCH overhead parameters:

a PCH code channel and a PCH data rate.

18. The wireless device of claim 14, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following overhead parameters:

a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

19. The wireless device of claim 18, wherein the processing means determines whether BCCH overhead parameters for a base station, including the BCCH code channel, the BCCH data rate and the BCCH coding rate, are current.

20. The wireless device of claim 18, wherein the processing means determines whether PCH overhead parameters for a base station, including the PCH code channel and the PCH data rate, are current.

21. A method for a wireless device to communicate data signals in a cellular network, the cellular network including a plurality of base stations coupled to the cellular network, the method comprising the steps of:

a) entering a base station acquisition initialization state and performing therein base station acquisition initialization steps including acquiring a pilot signal from and establishing synchronization with at least an initialization one of the plurality of base stations;

b) conducting and completing a first call session with at least one of the plurality of base stations after completing the base station acquisition initialization steps and exiting the base station acquisition initialization state of step (a);

c) receiving base station overhead information;

d) storing the received base station overhead information;

e) processing the received base station overhead information to determine whether the received base station overhead information is current for one of the plurality of base stations after the first call session is completed; and

f) beginning a second call session with one of the plurality of base stations following step (b) and prior to entering a further base station acquisition initialization state of step (a) in which the base station acquisition initialization steps are performed.

22. The method of claim 21, wherein the base station acquisition initialization steps performed in step (a) further include acquiring a synchronization channel and acquiring a system time of the initialization base station.

23. The method of claim 22, wherein the wireless device maintains an active base station set that includes a sub-set of the plurality of base stations.

24. The method of claim 23, wherein the step of receiving the base station overhead information includes receiving overhead information for each base station in the active base station set when a call session ends.

25. The method of claim 24, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following overhead parameters:

a Pseudorandom Noise Offset, a CDMA channel number, a CDMA Band Class, a Station Identifier, a Network Identifier pair, a Protocol Revision, a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

26. The method of claim 24, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following BCCH overhead parameters:

a BCCH code channel, a BCCH data rate, and a BCCH coding rate.

27. The method of claim 24, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following PCH overhead parameters:

a PCH code channel and a PCH data rate.

28. The method of claim 24, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following overhead parameters:

a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

29. The method of claim 28, wherein the processing step includes determining whether BCCH overhead parameters for a base station, including the BCCH code channel, the BCCH data rate, and the BCCH coding rate, are current.

30. The method of claim 28, wherein the processing step includes determining whether PCH overhead parameters for a base station, including the PCH code channel and the PCH data rate, are current.

31. An article of manufacture for use in a wireless device communicating data signals in a cellular network, the cellular network including a plurality of base stations coupled to the cellular network, the article of manufacture comprising computer readable storage media including program logic embedded therein that causes control circuitry to perform the steps of:

a) entering a base station acquisition initialization state and performing therein base station acquisition initialization steps including acquiring a pilot signal from and establishing synchronization with at least an initialization one of the plurality of base stations;

b) conducting and completing a first call session with at least one of the plurality of base stations after completing step (a);

c) receiving base station overhead information;

d) storing the received base station overhead information;

e) processing the received base station overhead information to determine whether the received base station overhead information is current for one of the plurality of base stations after the first call session is completed; and

f) beginning a second call session with one of the plurality of base stations following step (b) and prior to performing step (a) again.

32. The article of manufacture of claim 31, wherein the program logic causes control circuitry to perform further base station acquisition initialization steps of acquiring a synchronization channel and acquiring a system time in respect of the initialization base station.

33. The article of manufacture of claim 32, wherein the wireless device maintains an active base station set that includes a sub-set of the plurality of base stations.

34. The article of manufacture of claim 33, wherein the step of receiving base station overhead information includes receiving overhead information for each base station in the active base station set when a call session ends.

35. The article of manufacture of claim 34, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following overhead parameters:

a Pseudorandom Noise Offset, a CDMA channel number, a CDMA Band Class, a Station Identifier, a Network Identifier pair, a Protocol Revision, a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

36. The article of manufacture of claim 34, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following BCCH overhead parameters:

a BCCH code channel, a BCCH data rate, and a BCCH coding rate.

37. The article of manufacture of claim 34, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following PCH overhead parameters:

a PCH code channel and a PCH data rate.

38. The article of manufacture of claim 34, wherein the cellular network is a CDMA based network and the overhead information includes at least one of the following overhead parameters:

a BCCH code channel, a BCCH data rate, a BCCH coding rate, a PCH code channel, and a PCH data rate.

39. The article of manufacture of claim 38, wherein the processing step includes determining whether BCCH overhead parameters for a base station, including the BCCH code channel, the BCCH data rate, and the BCCH coding rate, are current.

40. The article of manufacture of claim 38, wherein the processing step includes determining whether PCH overhead parameters for a base station, including the PCH code channel and the PCH data rate, are current.