Method and system for handoffs between public and private networks

• US 9,591,537 B1
• Filed: 12/04/2012
• Issued: 03/07/2017
• Est. Priority Date: 05/19/2008
• Status: Active Grant

• Current Assignee: Sprint Spectrum LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Harris, David L., Rausch, Walter F.
• Primary Examiner(s): Tran, Phuc
• Application Number:
  US13/693,124
• Time in Patent Office: 1,554 Days
• US Class Current: 1/1
• CPC Class Codes: H04W 12/03 Protecting confidentiality, e.g. by encryption
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/1446 wherein at least one of the networks is unlicensed
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00

Abstract

A mobile station receives a neighbor list from a base station in an area of a public wireless network that borders a private wireless network. The neighbor list includes encrypted channel identifiers corresponding to private network channels transmitted by the private wireless network and unencrypted channel identifiers corresponding to public network channels transmitted by the public wireless network. If the mobile station does not subscribe to the private wireless network, the mobile station does not recognize the encrypted channel identifiers and simply ignores them. However, if the mobile station subscribes to the private wireless network, the mobile station decrypts the encrypted channel identifiers and determines whether it is able to initiate a handoff to any of the corresponding private network channels.

Claims

1. A method, comprising:

a base station wirelessly transmitting a neighbor list to a mobile station, said neighbor list including encrypted information and unencrypted information, said encrypted information identifying at least one private channel, said unencrypted information identifying at least one public channel, wherein said at least one private channel includes one or more channels transmitted by a neighboring base station in a private wireless network, and wherein said at least one public channel includes one or more channels transmitted by a neighboring base station in a public wireless network.

2. The method of claim 1, wherein said mobile station subscribes to said private wireless network and is able to decrypt said encrypted information.

3. The method of claim 1, wherein said mobile station does not subscribe to said private wireless network and is not able to decrypt said encrypted information.

4. The method of claim 1, wherein said base station is part of said public wireless network.

5. The method of claim 4, wherein said base station provides wireless coverage in a plurality of sectors, wherein said mobile station is being served by a particular sector of said base station, and wherein said at least one public channel includes one or more channels transmitted by one or more other sectors of said base station.

6. The method of claim 1, wherein said neighbor list message is an IEEE 802.16 neighbor advertisement message or a CDMA neighbor list message.