Two-protocol transmission method, reception method and corresponding devices and signal

A method for reception of data frames by an equipment conforming to a first protocol, the reception taking place in a frequency band shared with a network conforming to a second protocol, the method comprising:

• receiving a received frame comprising a new preamble and data encoded in accordance with the first protocol, the new preamble comprising a preamble conforming to a second protocol and a preamble field conforming to the first protocol, the preamble comprising a field of determined content;
• detecting the field of determined content through comparison with one of at least one field with determined content that are stored in a table, each field with determined content being stored with data size information;
• estimating a temporal duration of the received frame corresponding to the data size information corresponding to the detected field;
• and
• detecting and decoding the preamble field so as to determine decoding of the encoded data.

A mobile terminal conforming to a first protocol and able to transmit in a frequency band shared with a network conforming to a second protocol, the terminal comprising:

• an encoder configured to encode data in accordance with the first protocol to obtain encoded data;
• and
• at least one processor configured to:
• generate a preamble, called a preamble field, conforming to the first protocol;
• generate a preamble conforming to the second protocol, wherein the preamble conforming to the second protocol comprises a first field, a second field and a third field of determined content, the first field making it possible to detect the preamble, perform a rough frequency synchronization and a rough time synchronization, the second field making it possible to perform a fine frequency synchronization and a fine time synchronization;
• add the preamble field, to the preamble conforming to the second protocol so as to form a new preamble;
• and
• add the new preamble to the encoded data and forming a frame to be transmitted.

A mobile terminal conforming to a first protocol and able to receive a frame in a frequency band shared with a network conforming to a second protocol, a received frame comprising a new preamble and data encoded in accordance with the first protocol, the new preamble comprising a preamble conforming to the second protocol and a preamble field conforming to the first protocol, the preamble comprising a field of determined content, the terminal comprising:

• a detector configured to detect the field of determined content through comparison between the received frame and, in succession, at least one field with determined content that is stored in a table, each field with determined content being stored with data size information;
• a processor configured to:
• estimate a temporal duration of the received frame corresponding to the data size information corresponding to the detected field;
• a detector configured to detect the preamble field;
• and
• a decoder configured to decode the preamble field so as to determine decoding of the encoded data and to decode the encoded data.

A method for transmission of data by an equipment to a base station of a mobile access network conforming to a first protocol, the transmission taking place in a frequency band shared with a network conforming to a second protocol, comprising:

• encoding the data to be transmitted in accordance with the first protocol so as to obtain encoded data;
• determining a preamble conforming to the first protocol, called a preamble field;
• generating a preamble conforming to the second protocol and comprising a field of content that is determined by selecting a field with fixed content from among a plurality of fields in a table addressed by a number in relation with a temporal duration of a frame to be transmitted;
• adding the preamble field to the preamble conforming to the second protocol so as to form a new preamble;
• and
• adding the new preamble to the encoded data so as to form the frame to be transmitted.

A mobile terminal conforming to a first protocol and able to transmit in a frequency band shared with a network conforming to a second protocol, the terminal comprising:

• an encoder configured to encode data in accordance with the first protocol to obtain encoded data;
• and
• at least one processor configured to:
• generate a preamble, called a preamble field, conforming to the first protocol;
• generate a preamble conforming to the second protocol and comprising a field of content that is determined by selecting a field with fixed content from among a plurality of fields in a table addressed by a number in relation with a temporal duration of a frame to be transmitted;
• add the preamble field to the preamble conforming to the second protocol so as to form a new preamble;
• and
• add the new preamble to the encoded data and forming the frame to be transmitted.