Intelligent access point scanning with self-learning capability

• US 7,904,084 B2
• Filed: 03/16/2009
• Issued: 03/08/2011
• Est. Priority Date: 08/26/2005
• Status: Active Grant

• Current Assignee: Ribbon Communications Operating Company, Inc. (Ribbon Communications, Inc.)
• Original Assignee: Kineto Wireless Incorporated (Ribbon Communications, Inc.)
• Inventors: Baranowski, Joseph G., Shi, Jianxiong
• Primary Examiner(s): Appiah; Charles N
• Assistant Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US12/381,903
• Publication Number:
  US 20090323572A1
• Time in Patent Office: 722 Days
• Field of Search: 455/132, 455/160.1, 455/161.1, 455/161.2, 455/41.2, 455/550.1, 455/552.1, 455/553.1, 455/574, 455/515, 455/558, 455/432.1, 455/435.1, 455/343.1, 455/343.2, 455/343.5, 455/434, 370/310.2, 370/311, 370/328, 370/338
• US Class Current: 455/434
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for intelligent access point scanning with self-learning capability enables a wireless handset to conserve power while scanning for unlicensed mobile access.

Claims

1. A method for reducing power consumption of a wireless handset in a communication system comprising (1) a licensed first wireless communication system comprising a set of access cells and (2) a second wireless communication system comprising a set of wireless access points and a network controller for communicatively coupling the wireless handset to the licensed first wireless communication system through a wireless access point, the method comprising:

detecting an identifier associated with an access cell of the licensed first wireless communication system; and

setting a scan rate for connecting to the licensed first wireless communication system through a wireless access point of the second wireless communication system based upon prior experience of detecting wireless access points of the second wireless communication system within the access cell associated with said identifier.

2. The method of claim 1 further comprising assigning a probability measure to the detected identifier to reflect a result of scanning for the wireless access point of the second wireless communication system within the access cell of the licensed first wireless communication system associated with the identifier, wherein the probability measure determines the scan rate.

3. The method of claim 2 further comprising creating a monitored list of identifiers and assigning each identifier a corresponding probability measure in the monitored list, wherein each identifier is associated with a particular access cell of the licensed first wireless communication system.

4. The method of claim 3, wherein the scan rate is set to a default scan rate when a particular identifier matches an identifier in the monitored list but fails to connect to a wireless access point within the access cell associated with the identifier.

5. The method of claim 3 further comprising reducing the probability measure for a particular identifier in the monitored list when attempts to access a wireless access point is unsuccessful within the access cell associated with the particular identifier.

6. The method of claim 3 further comprising increasing the probability measure for a particular identifier in the monitored list when a connection to the licensed first wireless communication system is successful through a wireless access point within the access cell associated with the particular identifier.

7. The method of claim 3 further comprising setting the probability measure to a zero scan rate when the detected identifier does not match an identifier in the monitored list.

8. The method of claim 3 further comprising scanning at a default rate when a user overrides the scan rate determined by the monitored list of identifiers.

9. The method of claim 3 further comprising setting the probability measure to a default scan rate which corresponds to a non-zero scan rate when the detected identifier is a partial match to an identifier in the monitored list.

10. The non-transitory computer readable medium of claim 1, wherein the computer program further comprises a set of instructions for assigning a probability measure to the detected identifier to reflect a result of scanning for the wireless access point of the second wireless communication system within the access cell of the licensed first wireless communication system associated with the identifier, wherein the probability measure determines the scan rate.

11. The non-transitory computer readable medium of claim 10, wherein the computer program further comprises a set of instructions for creating a monitored list of identifiers and assigning each identifier a corresponding probability measure in the monitored list, wherein each identifier is associated with a particular access cell of the first licensed first wireless communication system.

12. A computer-readable medium storing a computer program, wherein the computer-readable medium is a physical storage medium and not propagated signals, the computer program for reducing power consumption of a wireless handset in a communication system comprising a licensed first wireless communication system comprising a set of access cells, and a second wireless communication system comprising a set of wireless access points and a network controller for communicatively coupling the wireless handset to the licensed first wireless communication system, the computer program comprising sets of instructions for:

storing a list of access cell identifiers of the licensed first wireless communication system, wherein each particular access cell identifier has an associated probability measure for connecting the wireless handset to the first wireless communication system through a wireless access point of the second wireless communication system;

updating the list each time an access cell identifier is detected; and

setting a scan rate for accessing a wireless access point of the second wireless communication system based on the probability measure associated with a detected access cell identifier in the list.

13. The computer-readable medium of claim 12, wherein the set of instructions for updating the list comprises a set of instructions for increasing the probability measure associated with a particular access cell identifier when the wireless handset successfully connects to the first wireless communication system through a wireless access point of the second wireless communication system within an access cell associated with the particular access cell identifier.

14. The computer-readable medium of claim 12, wherein the set of instructions for updating the list comprises a set of instructions for decreasing the probability measure associated with a particular access cell identifier when the wireless handset does not connect to the first wireless communication system through a wireless access point of the second wireless communication system within an access cell associated with the particular access cell identifier.

15. The computer-readable medium of claim 12, wherein the computer program further comprises a set of instructions for auditing the list of access cell identifiers, wherein auditing the list of access cell identifiers removes access cell identifiers in the list that have a corresponding minimum probability measure.

16. The computer-readable medium of claim 12, wherein the computer program further comprises a set of instructions for storing a timestamp for each access cell identifier, the timestamp of each particular access cell identifier corresponding to a last time a successful registration with the licensed first wireless communication system occurs through a wireless access point of the second wireless communication system within an access cell associated with the particular access cell identifier.

17. The computer-readable medium of claim 16 further comprising a set of instructions for auditing the list of access cell identifiers, wherein auditing the list of access cell identifiers removes access cell identifiers with an oldest timestamp.

18. A wireless handset, comprising:

a wireless interface to communicate with (1) a licensed first wireless communication system comprising a set of access cells and (2) a second wireless communication system comprising a set of wireless access points and a network controller for communicatively coupling the wireless handset to the licensed first wireless communication system;

a memory for storing a list of identifiers, wherein each identifier is associated with an access cell of the licensed first wireless communication system; and

a processor coupled to the memory and the wireless interface, the processor for;

detecting an identifier associated with an access cell of the licensed first wireless communication system;

obtaining a probability measure associated with the detected identifier from the list; and

setting a scan rate determined by the probability measure for accessing a wireless access point of the second wireless communication system that resides within the identified access cell of the licensed first wireless communication system.

19. The wireless handset of claim 18, wherein the probability measure reflects a probability of connecting to a particular wireless access point in the set of wireless access points within a particular access cell in the set of access cells.

20. The wireless handset of claim 18, wherein the processor is further for modifying the probability measure associated with a particular identifier based on whether a connection to a particular wireless access point is established within the access cell associated with the particular identifier.

21. The wireless handset of claim 18, wherein the processor is further for updating the probability measure associated with a particular identifier in the list of identifiers after at least one attempt to connect to a wireless access point within the access cell associated with the particular identifier.

22. A non-transitory computer readable medium storing a computer program for reducing power consumption of a wireless handset in a communication system comprising a licensed first wireless communication system comprising a set of access cells and a second wireless communication system comprising a set of wireless access points and a network controller for communicatively coupling the wireless handset to the licensed first wireless communication system through a wireless access point, the computer program comprising sets of instructions for:

detecting an identifier associated with an access cell of the licensed first wireless communication system; and

setting a scan rate for connecting to the licensed first wireless communication system through a wireless access point of the second wireless communication system based upon prior experience of detecting wireless access points of the second wireless communication system within the access cell associated with said identifier.