SYSTEM AND METHOD OF IN-BAND MODEM FOR DATA TRANSMISSION OVER DIGITAL WIRELESS COMMUNICATION NETWORKS Russian patent published in 2015 - IPC H04L1/16 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to means of transmitting information through a speech codec (in-band) in a wireless communication network. The method includes detecting a request signal at a source terminal in an in-band communication system; transmitting a synchronisation signal from the source terminal upon detection of the request signal; repeatedly receiving a negative acknowledgment (NACK) signal transmitted by a destination terminal at the source terminal, wherein the transmission of the NACK signal begins upon reception of a synchronisation signal at the destination terminal; repeatedly transmitting an user data segment from the source terminal using a first modulation scheme, wherein each transmission uses a different redundancy version; discontinuing transmission of the user data segment upon detection of a first received signal, wherein the first received signal indicates a successful reception of the user data segment from the destination terminal; and switching to a second modulation scheme if the source terminal receives a predetermined number of the NACK signals, wherein the NACK signal further indicates an unsuccessful reception of the user data segment from the destination terminal, and wherein the predetermined number is greater than one.

EFFECT: fewer errors and higher data transmission speed.

20 cl, 46 dwg, 6 tbl