Software code for improved in-band signaling for data communications over digital wireless telecommunications networks

• US 7,206,305 B2
• Filed: 03/11/2002
• Issued: 04/17/2007
• Est. Priority Date: 05/19/1997
• Status: Expired due to Term

• Current Assignee: Karma Automotive LLC (Wanxiang Group Corporation)
• Original Assignee: Airbiquity Incorporated
• Inventors: Preston, Joseph, Leyendecker, Robert, Eatherly, Wayne, Proctor, Rod L., Preston, Dan A.
• Primary Examiner(s): Pezzlo, John
• Assistant Examiner(s): MEHRA, INDER P
• Application Number:
  US10/095,866
• Publication Number:
  US 20020093990A1
• Time in Patent Office: 1,863 Days
• Field of Search: 370/310, 370/352, 370/522, 370/493, 370/533, 455/563
• US Class Current: 370/352
• CPC Class Codes: G01S 2205/002 for traffic control, mobile tracking, guidance, surveillance or anti-collision
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G08G 1/127 to a central station ; Indicators in a central station
• CPC Class Codes: H04M 11/066 Telephone sets adapted for data transmision
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices

Abstract

An inband signaling modem communicates digital data over a voice channel of a wireless telecommunications network. An input receives digital data. An encoder converts the digital data into audio tones that synthesize frequency characteristics of human speech. The digital data is also encoded to prevent voice encoding circuitry in the telecommunications network from corrupting the synthesized audio tones representing the digital data. An output then outputs the synthesized audio tones to a voice channel of a digital wireless telecommunications network.

Claims

1. Software code stored on computer-readable memory and executable on a processor for communicating digital data over a voice channel of a digital wireless telecommunications network comprising:

code for forming the digital data into a packet payload in an inband signaling packet;

code for attaching preconditioning bits to the inband signaling packet that prevent circuitry in the wireless telecommunications network from corrupting the digital data;

code for converting the bits in the inband signaling packet into a series of voice frequency tones that simulate characteristics of human speech; and

code for converting the simulated voice frequency tones into encoded data transmitted over the digital voice channel of a wireless telecommunications network.

2. The software code according to claim 1 including code for generating a sequence of bits in a preamble of the inband signaling packet wherein the sequence of bits include alternating or random bit patterns selected to prevent filtering tones representing digital data in the packet payload.

3. The software code according to claim 1 including code that converts the voice frequency tones into analog signals before sending the synthesized voice signals to a voice coder for transmission over the wire telecommunications network.