Method and system for modem protocol discrimination

• US 7,224,998 B2
• Filed: 01/31/2002
• Issued: 05/29/2007
• Est. Priority Date: 01/31/2002
• Status: Expired due to Fees

• Current Assignee: General Motors LLC (General Motors Company)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Crocker, Dwayne, Fraser, Ronald W.
• Primary Examiner(s): Nguyen; Duc M.
• Assistant Examiner(s): Cai; Wayne
• Application Number:
  US10/061,406
• Publication Number:
  US 20030144028A1
• Time in Patent Office: 1,944 Days
• Field of Search: 455/555, 455/426.1, 455/557, 370/352, 375/222, 375/254
• US Class Current: 455/557
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

The invention provides a method of selecting a modem carrier type for data transmission over a wireless communication system. An incoming call is received from a mobile vehicle and then an initial carrier tone is sent to a mobile vehicle in response to the incoming call. A modem response signal is received from a vehicle modem in response to the initial carrier tone. The modem response signal is determined to be either an analog modem response signal or a digital modem response signal, and then the call is connected to either the analog modem or digital modem based on the modem response signal determination.

Claims

1. A method of selecting a modem carrier type for data transmission over a wireless communication system, comprising:

receiving an incoming call from a mobile vehicle;

sending an initial carrier tone to the mobile vehicle in response to the incoming call;

receiving a modem response signal from a vehicle modem in response to the initial carrier tone;

determining whether the modem response signal is one of an analog modem response signal or a digital modem response signal;

connecting the call to one of an analog modem or a digital modem based on the modem response signal determination;

comparing a call routing number associated with the incoming call to a database of call routing numbers; and

sending the initial carrier tone if the call routing number does not match one of the call routing numbers in the database.

2. A wireless modem system for selecting a modem carrier type comprising:

means for receiving an incoming call from a mobile vehicle;

means for sending an initial carrier tone to the mobile vehicle in response to the incoming call;

means for receiving a modem response signal from a vehicle modem in response to the initial carrier tone;

means for determining whether the modem response signal is one of an analog modem response signal or a digital modem response signal;

means for connecting the call to one of an analog modem or a digital modem based on the modem response signal determination;

means for comparing a call routing number associated with the incoming call to a database of call routing numbers; and

means for sending the initial carrier tone if the call routing number does not match with one of the call routing numbers in the database.

3. A computer usable medium including a program for selecting a modem carrier type, comprising:

computer program code for receiving an incoming call from a mobile vehicle;

computer program code for sending an initial carrier tone to the mobile vehicle in response to the incoming call;

computer program code for receiving a modem response signal from a vehicle modem in response to the initial carrier tone;

computer program code for determining whether the modem response signal is one of an analog modem response signal or a digital modem response signal;

computer program code for connecting the call to one of an analog modem or a digital modem based on the modem response signal determination;

computer program code for comparing a call routing number associated with the incoming call to a database of call routing numbers; and

computer program code for sending the initial carrier tone if the call routing number does not match with one of the call routing numbers in the database.