DEVICES AND METHODS FOR FACILITATING REACQUISITION PROCEDURES

• US 20140198693A1
• Filed: 01/11/2013
• Published: 07/17/2014
• Est. Priority Date: 01/11/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gude, Venkata Siva Prasad, Sahu, Debesh Kumar, Neela, Jagadishwar, Cherian, George
• Granted Patent: US 9,357,488 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 68/005 Transmission of information for alerting of incoming communication
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Access terminals are adapted to facilitate reacquisition procedures for a slotted idle mode. According to one example, an access terminal can operate in a slotted idle mode. The access terminal can then determine one or more optimized parameters for reacquisition procedures. In one example, the access terminal can determine an optimized length of time for reacquisition periods by incrementally reducing the length of time for reacquisition periods until an optimized length of time is obtained. In another example, the access terminal can determine an optimized number of pseudorandom noise (PN) signals and PN positions to be stored during each awake state of the slotted idle mode by incrementally reducing the number of PN signals and PN positions that are stored until an optimized number of stored PN signals and PN positions is obtained. Other aspects, embodiments, and features are also included.

Claims

1. A power-conserving wireless communication device, comprising:

a storage medium comprising programming; and

a processing circuit operably coupled to the storage medium, the processing circuit adapted to execute the programming to systematically adjust one or more parameters for reacquisition procedures.

2. The device of claim 1, wherein the one or more parameters for reacquisition procedures comprises a length of time for reacquisition periods, and the processing circuit is adapted to:

systematically adjust the length of time for reacquisition periods until an optimized length of time is obtained.

3. The device of claim 2, wherein the processing circuit is adapted to:

systematically adjust the length of time by systematically reducing the length of time by a predetermined quantity until the optimized length of time is obtained.

4. The device of claim 2, wherein the optimized length of time for reacquisition periods is shorter than a default length of time for reacquisition periods.

5. The device of claim 1, wherein the one or more parameters for reacquisition procedures comprises a number of pseudorandom noise (PN) signals and PN positions stored in the storage medium for each reacquisition procedure, and the processing circuit is adapted to:

systematically reduce the number of PN signals and PN positions stored in the storage medium for each reacquisition procedure until an optimized number of PN signals and PN positions is obtained.

6. An access terminal, comprising:

a communications interface;

a storage medium; and

a processing circuit coupled to the communications interface and to the storage medium, the processing circuit adapted to;

obtain a default duration for reacquisition periods;

determine an optimized duration for the reacquisition periods; and

perform a reacquisition procedure using the optimized duration for the reacquisition procedure.

7. The access terminal of claim 6, wherein the optimized duration for the reacquisition periods is shorter than the default duration.

8. The access terminal of claim 6, wherein the default duration for reacquisition periods is obtained from a transmission received via the communications interface.

9. The access terminal of claim 6, wherein the processing circuit being adapted to determine the optimized duration for the reacquisition periods comprises the processing circuit being adapted to:

beginning with the default duration, incrementally decrease the duration for reacquisition periods by a predetermined value after each successful reacquisition procedure until a reacquisition procedure is unsuccessful;

increase the duration to a duration associated with a last successful reacquisition procedure in response to the unsuccessful reacquisition procedure; and

determine the duration associated with the last successful reacquisition procedure to be the optimized duration for reacquisition periods.

10. The access terminal of claim 6, wherein the processing circuit is further adapted to:

initiate another determination for an optimized duration for the reacquisition periods after expiration of a re-determination timer.

11. A method operational on an access terminal, comprising:

operating in a slotted idle mode; and

determining one or more optimized parameters for reacquisition procedures.

12. The method of claim 11, wherein determining the one or more optimized parameters for reacquisition procedures comprises:

determining an optimized length of time for reacquisition periods.

13. The method of claim 12, further comprising:

receiving a transmission including information indicating a default length of time to be employed for reacquisition periods, wherein the default length of time is longer than the optimized length of time.

14. The method of claim 12, wherein determining the optimized length of time for reacquisition periods comprises:

starting with an initial length of time, incrementally reducing the length of time for reacquisition periods by a predetermined value in response to each successful reacquisition procedure until a reacquisition procedure is unsuccessful.

15. The method of claim 14, wherein determining the optimized length of time for reacquisition periods further comprises:

in response to the unsuccessful reacquisition procedure, increasing the length of time associated with the unsuccessful reacquisition procedure by the predetermined value to obtain the optimized length of time for reacquisition periods.

16. The method of claim 11, wherein determining the one or more optimized parameters for reacquisition procedures comprises:

determining an optimized number of pseudorandom noise (PN) signals and PN positions to store for use in a subsequent reacquisition procedure.

17. The method of claim 11, further comprising:

employing the one or more optimized parameters for reacquisition procedures.

18. An access terminal, comprising:

means for operating in a slotted idle mode; and

means for determining one or more optimized parameters for reacquisition procedures.

19. The access terminal of claim 18, wherein the determination of one or more parameters for reacquisition procedures comprises a determination of an optimized length of time for reacquisition periods.

20. The access terminal of claim 19, wherein the optimized length of time for reacquisition periods is determined by:

incrementally reducing the length of time for reacquisition periods by a predetermined value in response to each successful reacquisition procedure until a reacquisition procedure is unsuccessful; and

in response to the unsuccessful reacquisition procedure, increasing the length of time associated with the unsuccessful reacquisition procedure by the predetermined value to obtain the optimized length of time for reacquisition periods.

21. The access terminal of claim 19, further comprising:

means for receiving a transmission including information indicating a default length of time to be employed for reacquisition periods, wherein the default length of time is longer than the optimized length of time.

22. The access terminal of claim 18, wherein the determination of one or more parameters for reacquisition procedures comprises a determination of an optimized number of pseudorandom noise (PN) signals and PN positions to store for use in a subsequent reacquisition procedure.

23. The access terminal of claim 18, further comprising:

means for employing the one or more optimized parameters for reacquisition procedures.

24. A computer-readable storage medium, comprising programming for causing a computer to:

operate in a slotted idle mode; and

determine one or more optimized parameters for reacquisition procedures.

25. The computer-readable storage medium of claim 24, wherein the programming for causing a computer to determine one or more optimized parameters for reacquisition procedures comprises programming for causing a computer to:

determine an optimized duration for reacquisition periods.

26. The method of claim 25, wherein the programming for causing a computer to determine the optimized duration for reacquisition periods comprises programming for causing a computer to:

begin with an initial duration;

incrementally decrease the duration for reacquisition periods by a predetermined value in response to each successful reacquisition procedure until a reacquisition procedure is unsuccessful; and

in response to the unsuccessful reacquisition procedure, increase the duration associated with the unsuccessful reacquisition procedure by the predetermined value to obtain the optimized duration for reacquisition periods.

27. The computer-readable storage medium of claim 24, wherein the programming for causing a computer to determine one or more optimized parameters for reacquisition procedures comprises programming for causing a computer to:

determine an optimized number of pseudorandom noise (PN) signals and PN positions to store for use in a subsequent reacquisition procedure.

28. The computer-readable storage medium of claim 24, further comprising programming for causing a computer to:

employ the one or more optimized parameters for reacquisition procedures.

29. A method of wireless communication operable at an access terminal operating in a slotted mode, the method comprising:

receiving an information element indicating a duration of a reacquisition window; and

performing a reacquisition attempt utilizing a modified duration different than the indicated duration for the reacquisition window.

30. In a communication system comprising components configured for wireless communication, a communication device comprising:

a reacquisition module configured to receiving an information element indicating a duration of a reacquisition window; and

a processor configured to modify the reacquisition window to enable optimal reacquisition.