Mobile to mobile text messaging using keyed modulation

Details Mobile to mobile text messaging using keyed modulation Mobile to mobile text messaging using keyed modulation

2011-08-16

2011-08-16

Afshar, Kamran (Department: 2617)

Telecommunications

Radiotelephone system

Auxiliary data signaling

C455S432200, C455S456600, C455S418000, C455S566000, C455S090300

Reexamination Certificate

active

08000729

ABSTRACT:
A text messaging system conveys text messages between a sender and a recipient in a wireless carrier network. A sender mobile handset includes manual input for identifying text characters in a message to be sent to the recipient and an audio-band encoder coupled to the manual input for representing the text characters with a keyed modulation stream. The keyed modulation stream is transmitted over a non-signaling channel of the wireless carrier network to a base station. At least one mobile switching center in the wireless carrier network transports the message between the sender mobile handset and the recipient mobile handset. A demodulator operating on behalf of the recipient converts the keyed modulation stream to decoded text. A recipient mobile handset including a display interface and a display receives the decoded text and displays the text characters of the message to the recipient.

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