Sector identification using sector parameters signatures

• US 8,737,295 B2
• Filed: 11/12/2008
• Issued: 05/27/2014
• Est. Priority Date: 11/16/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Horn, Gavin B., Ulupinar, Fatih, Agashe, Parag A., Prakash, Rajat
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): VU, HOANG-CHUONG Q
• Application Number:
  US12/269,654
• Publication Number:
  US 20090129327A1
• Time in Patent Office: 2,022 Days
• Field of Search: 370/254, 370/338, 370/328, 370/329
• US Class Current: 370/328
• CPC Class Codes: H04L 63/104 Grouping of entities
• CPC Class Codes: H04W 12/08 Access security
• CPC Class Codes: H04W 48/02 Access restriction performed under specific conditions
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

Systems and methodologies are described that facilitate identifying sectors using sector parameters signatures. The signatures can be generated as a known function of a previous sector parameters signature (or message parameters), system time, and an identifier. In this regard, mobile devices can determine an expected identifier from comparing the sector parameters signature to a sector parameters signature computed based at least in part on the system time known to the mobile device. In addition, the mobile device can utilize a known or an inferred previous parameters signature to determine the expected identifier. Multiple signatures can be evaluated to determine expected identifiers to increase the likelihood of correct identification since the signatures are generated using the known variables along with the identifier.

Claims

1. A method for identifying an access point in a wireless communication network, comprising:

receiving a first sector parameters signature from an access point, wherein the first sector parameters signature is generated based at least in part on a previous sector parameters signature, an identifier, and a system time of transmitting the first sector parameters signature;

computing a second sector parameters signature based at least in part on the previous sector parameters signature, the system time, and a predicted identifier;

comparing the first and second sector parameters signatures to determine a match between the identifier and the predicted identifier; and

establishing communication based at least in part on the match between the identifier and the predicted identifier.

2. The method of claim 1, further comprising determining the system time based on receiving the first sector parameters signature.

3. The method of claim 1, further comprising requesting connection establishment with the access point based at least in part on the match between the identifier and the predicted identifier.

4. The method of claim 3, wherein the connection establishment is requested as part of a cell reselection command related to communicating with a disparate access point.

5. The method of claim 1, further comprising camping on the access point based at least in part on the match between the identifier and predicted identifier.

6. The method of claim 1, wherein the first sector parameters signatures is received in broadcast overhead messages.

7. The method of claim 1, further comprising receiving a pilot signal from the access point to determine whether access is desired from the access point.

8. The method of claim 1, wherein the identifier is a restricted group identifier.

9. The method of claim 8, wherein the restricted group identifier is text based.

10. The method of claim 8, wherein the restricted group identifier indicates that the access point is restricted with respect to signaling, data access, registration, and/or service.

11. The method of claim 1, wherein the second sector parameters signature is computed using a generated random or pseudo random sequence of signatures.

12. A wireless communications apparatus, comprising:

at least one processor configured to;

receive a first sector parameters signature from an access point, wherein the first sector parameters signature is generated based at least in part on a previous sector parameters signature, an identifier and a system time of transmitting the first sector parameters signature;

determine a second sector parameters message using a predicted identifier, the previous sector parameters signature, and the system time;

compare the identifier to the predicted identifier to determine a match therebetween; and

establish communication based at least in part on the match; and

a memory coupled to the at least one processor.

13. A wireless communications apparatus that facilitates identifying an access point in a wireless network, comprising:

means for receiving a first sector parameters signature from an access point;

means for computing a second sector parameters signature utilizing a function along with a predicted identifier, a previous sector parameters signature, and a system time for transmitting the first sector parameters signatures;

means for comparing the first and second sector parameters signatures to determine a match between the identifier and the predicted identifier; and

means for establishing communication based at least in part on the match between the identifier and the predicted identifier.

14. A computer program product, comprising:

a non-transitory computer-readable medium comprising;

code for causing at least one computer to receive a first sector parameters signature from an access point, wherein the first sector parameters signature is generated based at least in part on a previous sector parameters signature, an identifier, and a system time of transmitting the first sector parameters signature;

code for causing the at least one computer to compute a second sector parameters signature based at least in part on the previous sector parameters signature, the system time, and a predicted identifier; and

code for causing the at least one computer to compare the first and second sector parameters signatures to determine a match between the identifier and the predicted identifier; and

code for causing the at least one computer to establish communication based at least in part on the match between the identifier and the predicted identifier.

15. An apparatus, comprising:

a sector parameters signature receiver that receives a first sector parameters signature from a sector generated using a function based at least in part on a previous sector parameters signature, a system time, and an identifier;

a sector identifier determiner that computes a second sector parameters signature based at least in part on the function utilizing a predicted identifier, the previous sector parameters signature, and the system time, the sector identifier determiner compares the first and second sector parameters signatures to determine a match between the identifier and the predicted identifier; and

a cell reselector that establishes communication in the sector based at least in part on the match between the identifier and the predicted identifier.

16. The apparatus of claim 15, wherein the cell reselector establishes communication in the sector in an idle communication mode based at least in part on an identified match between the identifier and the predicted identifier.

17. The apparatus of claim 15, wherein the sector parameters signature receiver receives the first sector parameters signatures in one or more broadcast overhead messages.

18. The apparatus of claim 15, wherein the cell reselector receives a pilot signal from an access point related to the sector and determines whether access is desired from the access point based at least in part on an identifier in the pilot signal.

19. The apparatus of claim 15, wherein the identifier is a restricted group identifier.

20. The apparatus of claim 19, wherein the restricted group identifier is text based.

21. The apparatus of claim 19, wherein the restricted group identifier indicates that the access point is restricted with respect to signaling, data access, registration, and/or service.