Scanning Channels While a Device is Out of Service

• US 20100234021A1
• Filed: 03/12/2009
• Published: 09/16/2010
• Est. Priority Date: 03/12/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ngai, Francis M., Tu, Alex Kuang-Hsuan, Kanade, Parag Mohan, Deepak, Virat
• Granted Patent: US 8,090,395 B2
• Time in Patent Office: Days
• US Class Current: 455/433
• CPC Class Codes: H04W 36/385 of the core network
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service

Abstract

A channel scanning order is dynamically created, modified, selectively ignored, or combinations thereof based on historical data, motion information, context information, alert message systems, network reselection, or combinations thereof. If a less preferred network has served a mobile device longer than a threshold amount of time, acquisition of the less preferred network is attempted before attempting acquisition of a more preferred network.

Claims

1. A method performed by a mobile device for scanning channels in a communications environment, comprising:

determining a time in service for a mobile device as a function of historical acquisition times and historical network depart times;

developing a network log based on the time in service determination; and

creating a channel ranking order based, in part, on the time in service determination, wherein the channel ranking order provides a sequence used by the mobile device for scanning channels in a communication environment.

2. The method of claim 1, further comprising:

evaluating motion information associated with the mobile device; and

utilizing the motion information to create the channel ranking order, wherein the motion information includes speed, direction, and altitude data.

3. The method of claim 1, further comprising:

evaluating a context associated with the communication environment, the mobile device, or combinations thereof, and

utilizing the context information to create the channel ranking order.

4. The method of claim 1, further comprises periodically scanning for availability of preferred networks during a network reselection attempt if a less preferred network is currently serving the mobile device.

5. The method of claim 1, wherein creating the channel ranking order comprises:

determining less preferred networks served the mobile device greater than a threshold percentage of time; and

attempting to acquire a less preferred network.

6. The method of claim 1, wherein creating the channel ranking order comprises:

determining less preferred networks did not serve the mobile device greater than a threshold percentage of time; and

attempting to acquire a preferred network.

7. The method of claim 1, wherein the network log includes information related to whether each network is a home network or a roaming network.

8. The method of claim 1, wherein historical network depart times include loss of network or leaving a network based on an instruction from the network.

9. The method of claim 1, further comprising:

determining a location of the mobile device; and

modifying the channel ranking order as a function of the location.

10. A wireless communications apparatus, comprising:

a memory that retains instructions related to calculating a time in service for each network acquired during a target time period, constructing a network log based on the time in service calculation, and creating a channel scan order that provides a sequence to scan channels in a communication environment, wherein the time in service is calculated as a function of historical acquisition times and historical network depart times; and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

11. The wireless communications apparatus of claim 10, the memory further retains instructions related to evaluating motion information associated with the mobile device and utilizing the motion information to create the channel scan order, wherein the motion information includes speed, direction, and altitude data.

12. The wireless communications apparatus of claim 10, the memory further retains instructions related to evaluating a context associated with the communication environment, the wireless communications apparatus, or combinations thereof and utilizing the context information to create the channel scan order.

13. The wireless communications apparatus of claim 10, the memory further retains instructions related to periodically scanning for availability of preferred networks during a network reselection attempt if a less preferred network is currently serving the wireless communications apparatus.

14. The wireless communications apparatus of claim 10, the memory further retains instructions related to determining less preferred networks served the wireless communications apparatus greater than a threshold percentage of time and attempting to acquire the less preferred network.

15. The wireless communications apparatus of claim 10, the memory further retains instructions related to determining less preferred networks did not serve the wireless communication apparatus greater than a threshold percentage of time and attempting to acquire a preferred network.

16. The wireless communications apparatus of claim 10, wherein the network log includes information related to whether each network is a home network or a roaming network.

17. A wireless communications apparatus that scans channels in a dynamically determined order, comprising:

means for analyzing a time in service for the wireless communications apparatus as a function of historical acquisition times and historical network depart times;

means for generating a network log based on the time in service determination, wherein the network log includes information related to whether each network is a home network or a roaming network; and

means for establishing a channel scan order based, in part, on the time in service determination, wherein the channel scan order provides an arrangement for scanning channels in a communication environment.

18. The wireless communications apparatus of claim 17, further comprises means for periodically scanning for availability of preferred networks during a network reselection attempt if a less preferred network is currently serving the wireless communications apparatus.

19. The wireless communications apparatus of claim 17, further comprising:

means for estimating that less preferred networks served the wireless communications apparatus greater than a threshold percentage of time; and

means for scanning less preferred networks more often than preferred networks.

20. The wireless communications apparatus of claim 17, further comprising:

means for estimating that less preferred networks did not serve the wireless communications apparatus greater than a threshold percentage of time; and

means for attempting to acquire a preferred network before attempting to acquire a less preferred network.

21. A computer program product, comprising:

a computer-readable medium comprising;

a first set of codes for causing a computer to calculate a time in service for a mobile device as a function of historical network acquisition times and historical network depart times;

a second set of codes for causing the computer to generate a network log based on the time in service determination; and

a third set of codes for causing the computer to establish a channel ranking order based, in part, on the time in service determination, wherein the channel ranking order provides a sequence for scanning channels in a communications environment.

22. At least one processor configured to scan network channels in a preferred order, comprising:

a first module for ascertaining a time in service for a mobile device as a function of historical network acquisition times and historical network depart times;

a second module for developing a network log based on the time in service determination;

a third module for generating a channel ranking order based, in part, on the time in service determination, wherein the channel ranking order provides a sequence for scanning channels in a communications environment; and

a fourth module for periodically scanning for availability of preferred networks during a network reselection attempt if a less preferred network is currently serving the mobile device.