Alexander M Usach

US Patent:

20100039315, Feb 18, 2010

Filed:

Feb 27, 2009

Appl. No.:

12/394416

Inventors:

Steven Malkos - San Jose CA, US
Andrei Kosolobov - San Jose CA, US
David Albert Lundgren - Mill Valley CA, US
Manuel del Castillo - Madrid, ES
Christopher Lane - Ridgewood NJ, US
Alexander Michael Usach - San Francisco CA, US

Assignee:

BROADCOM CORPORATION - Irvine CA

International Classification:

G01S 5/14

US Classification:

3423571, 34235712, 4554561

Abstract:

A GNSS enabled mobile device transmits to a location server a combination of GNSS-based location data and non-GNSS based location data used to determining reference positions at the location server. The GNSS mobile device receives the determined reference positions from the location server to calculate an associated GNSS position fix. The transmitted GNSS-based location data comprises GNSS position fixes associated with the GNSS enabled mobile device. The transmitted non-GNSS-based location data comprises a serving Cell-ID, neighbor Cell-IDs, neighbor cell fingerprinting, timing advance parameters, and/or a mobile country code. Reference positions associated with the serving Cell-ID are determined and/or refined based on location information acquired from each of associated mobile devices. To respond to a reference position request from the GNSS enabled mobile device without an associated serving Cell-ID, the location server determines corresponding reference positions by combing subscriber population density with an associated MCC.

US Patent:

20110039575, Feb 17, 2011

Filed:

Apr 9, 2010

Appl. No.:

12/757682

Inventors:

Manuel Del Castillo - Madrid, ES
Steve Malkos - San Jose CA, US
David Albert Lundgren - Mill Valley CA, US
Vladimir Belov - Union City CA, US
Alexander Usach - San Francisco CA, US
Andrei Kosolobov - San Jose CA, US
James William Lamance - Hixson TN, US

International Classification:

H04W 64/00

US Classification:

4554561

Abstract:

A mobile device learns cell information for a serving cell and for neighbor cells. The learned cell information is communicated to a remote location server for locating base stations within the serving and/or neighbor cells. The learned cell information comprises cell signal strength information and/or other cell information such as cell identifiers (Cell-IDs) and Country Code (MCC). Received signal strength (RSS) on the serving cell and the neighbor cells are measured. Locations pertaining to the RSS measurements are determined. The mobile device location stamps the RSS measurements utilizing the determined locations to generate a neighbor cell report, which is utilized by a cellular communication network to prepare a handover operation whenever needed, and/or to build a local cell-learning database. A portion of the local cell-learning database is transmitted as cell data to the remote location server that collects cell data from a plurality of mobile devices.

US Patent:

20120223857, Sep 6, 2012

Filed:

Dec 6, 2011

Appl. No.:

13/312385

Inventors:

Steven Malkos - San Jose CA, US
Andrei Kosolobov - San Jose CA, US
David Albert Lundgren - Mill Valley CA, US
Manuel del Castillo - Madrid, ES
Christopher Lane - Ridgewood NJ, US
Alexander Michael Usach - San Francisco CA, US

Assignee:

BROADCOM CORPORATION - Irvine CA

International Classification:

G01S 19/06
G01S 19/12

US Classification:

34235743, 34235749

Abstract:

A GNSS enabled mobile device transmits to a location server a combination of GNSS-based location data and non-GNSS based location data used to determining reference positions at the location server. The GNSS mobile device receives the determined reference positions from the location server to calculate an associated GNSS position fix. The transmitted GNSS-based location data comprises GNSS position fixes associated with the GNSS enabled mobile device. The transmitted non-GNSS-based location data comprises a serving Cell-ID, neighbor Cell-IDs, neighbor cell fingerprinting, timing advance parameters, and/or a mobile country code. Reference positions associated with the serving Cell-ID are determined and/or refined based on location information acquired from each of associated mobile devices. To respond to a reference position request from the GNSS enabled mobile device without an associated serving Cell-ID, the location server determines corresponding reference positions by combing subscriber population density with an associated MCC.

US Patent:

20170366527, Dec 21, 2017

Filed:

Jun 15, 2017

Appl. No.:

15/624318

Inventors:

- San Francisco CA, US
Stephen E. Smith - Austin TX, US
Roderick Schultz - San Francisco CA, US
Marcos Portnoi - Austin TX, US
Stuart W. Juengst - Austin TX, US
Charles T. Schad - Austin TX, US
Michael K. Eneboe - Georgetown TX, US
Alexander Usach - San Francisco CA, US
Keith Evans - San Jose CA, US

International Classification:

H04L 29/06
H04L 9/32

Abstract:

Embodiments of systems and methods disclosed herein include an embedded secret provisioning system that is based on a shared-derivative mechanism. Embodiments of this mechanism use a trusted third-party topology, but only a single instance of a public-private key exchange is required for initialization. Embodiments of the system and methods are secure and any of the derived secret keys are completely renewable in untrusted environments without any reliance on asymmetric cryptography. The derived secrets exhibit zero knowledge attributes and the associated zero knowledge proofs are open and available for review. Embodiments of systems and methods can be implemented in a wide range of previously-deployed devices as well as integrated into a variety of new designs using minimal roots-of-trust.

US Patent:

20170041302, Feb 9, 2017

Filed:

Aug 3, 2016

Appl. No.:

15/227421

Inventors:

- San Francisco CA, US
Roderick Schultz - San Francisco CA, US
Stephen E. Smith - Austin TX, US
Alexander Usach - San Francisco CA, US
Marcos Portnoi - Austin TX, US

International Classification:

H04L 29/06

Abstract:

Embodiments as described herein provide systems and methods for sharing secrets between a device and another entity. The shared secret may be generated on the device as a derivative of a secret value contained on the device itself in a manner that will not expose the secret key on the device and may be sent to the entity. The shared secret may also be stored on the device such that it can be used in future secure operations on the device. In this manner, a device may be registered with an external service such that a variety of functionality may be securely accomplished, including, for example, the generation of authorization codes for the device by the external service based on the shared secret or the symmetric encryption of data between the external service and the device using the shared secret.

US Patent:

20160352733, Dec 1, 2016

Filed:

May 27, 2016

Appl. No.:

15/167254

Inventors:

- San Francisco CA, US
Roderick Schultz - San Francisco CA, US
Stephen E. Smith - Austin TX, US
Alexander Usach - San Francisco CA, US
Marcos Portnoi - Austin TX, US

International Classification:

H04L 29/06
H04L 9/30
H04L 9/14
H04L 9/32

Abstract:

Embodiments of systems and methods disclosed herein include a distributed device activation mechanism involving a group of external entities without using asymmetric cryptography. Systems and methods include techniques for deriving a device secret using a hardware secret and authenticated unique input data provided to the device by one or more external entities. A hardware hash function uses the hardware secret as a key and the authenticated unique input data as input data to output the derived device secret. The derived device secret is written to a security register of the device to enter a new security layer.