Elizabeth E Chesnutt

US Patent:

7912149, Mar 22, 2011

Filed:

May 3, 2007

Appl. No.:

11/744065

Inventors:

Elizabeth Chesnutt - Troy MI, US
Sethu K. Madhavan - Erie PA, US
Iqbal Surti - Troy MI, US
Jijin Yin - Los Angeles CA, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04L 27/00

US Classification:

375316

Abstract:

A system and method for asynchronous data communication over a cellular communications network that allows the transmission of different types of data frames over a voice channel using a vocoder. The data frames include a synchronization signal and data segment, with the synchronization signal being selected in accordance with an attribute of the data segment so that, upon receipt of the data frame, the synchronization signal can be used by the demodulating modem to determine not only where the data segment begins, but also to identify what type of data segment is in the received data frame. The synchronization signals used have low cross-correlation and an auto-correlation function that approximates a unit impulse function to provide reliable transmission through the vocoder.

US Patent:

7970381, Jun 28, 2011

Filed:

Aug 13, 2007

Appl. No.:

11/837775

Inventors:

Elizabeth Chesnutt - Troy MI, US
Ki Hak Yi - Windsor, Ontario, CA
Anthony J. Sumcad - Southfield MI, US
Kevin R. Krause - Plymouth MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04M 1/66

US Classification:

455411, 455410, 455466, 455419, 4554143, 701 9, 701 24, 701 36

Abstract:

An authentication method that can be used by a telematics-equipped vehicle to authenticate an SMS message and provide additional security features above and beyond those inherent to the SMS protocol. Generally speaking, a call center uses a mathematical function to derive a security code, and then sends an SMS message to a telematics-equipped vehicle that includes information related to the derived security code. The telematics-equipped vehicle can utilize the transmitted information to authenticate the sender of the SMS message and/or its contents. One group of suitable mathematical functions utilizes keyed-hash message authentication codes (HMACs).

US Patent:

8000842, Aug 16, 2011

Filed:

Sep 28, 2007

Appl. No.:

11/864358

Inventors:

Ki Hak Yi - Ontario, CA
John L. Dale - Fenton MI, US
Elizabeth Chesnutt - Troy MI, US
James Bicego, Jr. - Utica MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

G05D 1/00
G06F 19/00

US Classification:

701 1, 701 2, 701 35

Abstract:

The disclosed examples illustrate a system and method that prevent excessive current drain through the network access device (NAD) of a telematics unit and provide flexible discontinuous-receive management. Normally, when in a Standby State and where communication service is unavailable, the NAD may dissipate current at rate many times more than where communication service is available. A Standby Counter provides the length of the time interval for Standby State or the sleep cycle. Certain of the disclosed examples prevent excessive vehicle battery drain by operating the telematics unit in a first mode wherein a sleep cycle value of the telematics unit is above a first predetermined threshold, and if the communication service is available, operating the telematics unit in a second mode wherein a sleep cycle value is in a range from zero to the first predetermined threshold.

US Patent:

8194779, Jun 5, 2012

Filed:

Oct 31, 2006

Appl. No.:

11/554985

Inventors:

Elizabeth Chesnutt - Troy MI, US
Jijun Yin - Los Angeles CA, US
Sethu Madhavan - Canton MI, US
Iqbal Surti - Troy MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04L 27/10
H04L 23/00

US Classification:

375283, 375272, 375377

Abstract:

A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that operates in different modes depending upon characteristics of the inputted signal it receives. To prepare the digital data for transmission, one or more carrier signals are encoded with the digital data using one of a number of modulation schemes that utilize differential phase shift keying to give the modulated carrier signal certain periodicity and energy characteristics that allow it to be transmitted by the vocoder at full rate. The modulation schemes include DPSK using either a single or multiple frequency carriers, combined FSK-DPSK modulation, combined ASK-DPSK, as well as PSK with a phase tracker in the demodulator. These modulation schemes permit data communication via a CDMA, GSM, or other type of voice traffic channel at a low bit error rate.

US Patent:

8195129, Jun 5, 2012

Filed:

Jun 16, 2011

Appl. No.:

13/162196

Inventors:

Elizabeth Chesnutt - Troy MI, US
Ki Hak Yi - Windsor, CA
Anthony J. Sumcad - Southfield MI, US
Kevin R. Krause - Plymouth MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04M 1/66

US Classification:

455411, 455410, 455466, 4555691, 4555752

Abstract:

A vehicle telematics unit or other electronic hardware in a vehicle authenticates an incoming SMS message and provides additional security features above and beyond those inherent to the SMS protocol. A call center uses a mathematical function to derive a security code, and then sends an SMS message to the vehicle. The telematics unit can utilize the transmitted information to authenticate the sender of the SMS message and/or its contents. One group of suitable mathematical functions utilizes keyed-hash message authentication codes (HMACs).

US Patent:

8195148, Jun 5, 2012

Filed:

Aug 14, 2009

Appl. No.:

12/541572

Inventors:

Sethu K. Madhavan - Canton MI, US
Ki Yak Yi - Windsor, CA
Elizabeth Chesnutt - Troy MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04W 4/00

US Classification:

4554221, 455466, 370328

Abstract:

A system and method for making vehicle originated calls to a telematics service provider or other call center. The method includes identifying a call type associated with a desired wireless communication of speech or data to the call center, and then carrying out one of a number of different call connection processes depending on the call type. For voice channel cellular connections, an in-band modem cellular connection is preferably established in most instances using a connection retry strategy that includes primary, secondary, and possibly tertiary connection attempts each of which utilize at least one of a number of different voice and data call origination processes. The system and method can be carried out in connection with various cellular system technologies, but is especially suited for use with GSM systems.

US Patent:

8259840, Sep 4, 2012

Filed:

Dec 31, 2007

Appl. No.:

11/967396

Inventors:

Elizabeth Chesnutt - Troy MI, US
Jijun Yin - Los Angeles CA, US
Sethu K. Madhavan - Canton MI, US
Iqbal M. Surti - Troy MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04L 27/20

US Classification:

375295, 375308

Abstract:

A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that operates in different modes depending upon characteristics of the inputted signal it receives. To prepare the digital data for transmission, one or more carrier signals are encoded with the digital data using one of a number of modulation schemes that utilize differential phase shift keying to give the modulated carrier signal certain periodicity and energy characteristics that allow it to be transmitted by the vocoder at full rate. The modulation schemes include DPSK using either a single or multiple frequency carriers, combined FSK-DPSK modulation, combined ASK-DPSK, PSK with a phase tracker in the demodulator, as well as continuous signal modulation (ASK or FSK) with inserted discontinuities that can be independent of the digital data.

US Patent:

8306560, Nov 6, 2012

Filed:

Sep 28, 2007

Appl. No.:

11/864248

Inventors:

Kevin R. Krause - Plymouth MI, US
Ki-Hak Yi - Windsor, CA
Elizabeth Chesnutt - Troy MI, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

H04W 4/00
H04M 1/725

US Classification:

455466, 4554121

Abstract:

A method and system for configuring a telematics device is constructed so as to use two-way short message service (SMS) to provide improved configuration execution. Mobile identification number (MIN), Mobile Directory Number (MDH), Home System Identification (SID) number, SID/NID pairs, NAI/password for packet data, over the air service provisioning (OTASP) number, and Preferred Roaming List (PRL) flag can be easily updated with no manual or voice channel configuration actions. In addition, other system settings such as button behavior, language, call barring, adding units to hands-free calling, etc. may be updated as well. In an example, a series of binary SMS messages configures the telematics device, with a subset of the messages being used specifically for configuration while the remaining message initiates a packet data session to complete additional configuration.