System and method for downloading network information to mobile stations for location calculation

Patent 6671377 Issued on December 30, 2003. Estimated Expiration Date:

March 18, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Secure communication of information
Patent #: 5577122
Issued on: 11/19/1996
Inventor: Schipper, et al.

Method for dynamically updating cellular phone unique encryption keys
Patent #: 5991405
Issued on: 11/23/1999
Inventor: Mills

Prevention of alteration of location information for mobile-based location calculation Patent #: 6216007
Issued on: 04/10/2001
Inventor: Havinis, et al.

Inventors

Assignee

Ericsson Inc.

Application

No. 09/272692 filed on 03/18/1999

US Classes:

380/258, Position dependent or authenticating380/259, Symmetric key cryptography380/262, Transmitting a seed, sequence, or initial value380/264, Key derived from addressable memory element380/281, Using master key (e.g., key-encrypting-key)455/433, Home location registration (HLR) or visitor location registration (VLR) detail455/456.1, Location monitoring713/171Having key exchange

Examiners

Primary: Morse, Gregory
Assistant: Callahan, Paul E.

International Classes

G01S 1/00 (20060101)
G01S 5/02 (20060101)
H04L 29/06 (20060101)
H04Q 7/38 (20060101)

Abstract

A telecommunications system and method is disclosed for downloading encrypted network information, such as Base Transceiver Station (BTS) coordinates, in a point-to-point manner between the network and a Mobile Station (MS) with location calculation capabilities. When an MS registers with the network, the MS shall indicate as part of the "early classmark" process its location calculation capabilities and the type algorithm to be used for deciphering the network information. As a result of a mobile originating request for assistance data, the network shall encrypt and download the network information to the MS. The MS deciphers the network information in order to position itself.