Preamble configuration method, transmission method and related device

A preamble transmission method on an unlicensed carrier, comprising:

• receiving, by user equipment, control signaling carrying a Physical Random Access Channel (PRACH) configuration message sent by a base station on a current carrier;
• the control signaling comprising Radio Resource Control. (RRC) signaling and/or Digital Copyright Identifier (DCI) signaling;
• the PRACH configuration message comprising subframe location information, first Clear Channel Assessment (CCA) interval location information, a channel detection mechanism, preamble format information, and preamble sending location information;
• the subframe location information representing a subframe where M to-be-transmitted preambles being located, the subframe being an uplink subframe, a special subframe or a downlink partial subframe;
• the first CCA interval location information representing a location of a CCA interval before each preamble in the M to-be-transmitted preambles on the subframe or on a previous subframe of the subframe;
• the channel detection mechanism indicating whether to indicate user equipment to detect an idle state of the unlicensed carrier;
• the preamble format information representing that the preambles are format 4 preambles;
• the preamble sending location information representing a least one sending location of the to-be-transmitted format 4 preambles in the sublime;
• determining, by the user equipment, the location of the CCA interval before the M to-be-transmitted preambles based on the subframe location information and the first CCA interval location information, and detecting a state of the unlicensed carrier in the CCA interval before the M to-be-transmitted preambles according to the channel detection mechanism;
• and
• acquiring, by the user equipment, a preamble corresponding to the preamble format information, and sending the preamble to the base station according to an indication of the preamble sending location information, when the unlicensed carrier being detected to be in an idle state in the CCA interval before the to-be-transmitted preambles.

User equipment, comprising:

• at least one processor;
• and
• a storage device storing a plurality of instructions, which when executed by the processor, causes the at least one processor to:
• receive control signaling carrying a Physical Random Access Channel (PRACH) configuration message sent by a base station on a current carrier;
• the control signaling comprising Radio Resource Control (RRC) signaling and/or Digital Copyright Identifier (DCI) signaling;
• the PRACH configuration message comprising subframe location information, first Clear Channel Assessment (CCA) interval location information, a channel detection mechanism, preamble format information, and preamble sending location information;
• the subframe location information representing a subframe where M to-be-transmitted preambles being located, the subframe being an uplink subframe, a special subframe or a downlink partial subframe;
• the first CCA interval location information representing a location of a CCA interval before each preamble in the M to-be-transmitted preambles on the subframe or on a previous subframe of the subframe;
• the channel detection mechanism indicating whether to indicate user equipment to detect an idle state of the unlicensed carrier;
• the preamble format information representing that the preambles are format 4 preambles;
• the preamble sending location information representing at least one sending location of the to-be-transmitted format 4 preambles in the subframe;
• determine the location of the CCA interval before the M to-be-transmitted preambles based on the subframe location information and the first CCA interval location information, and detect a state of the unlicensed carrier in the CCA interval before the M to-be-transmitted preambles according to the channel detection mechanism;
• and
• acquire a preamble corresponding to the preamble format information, and send the preamble to the base station according to an indication of the preamble sending location information, when the unlicensed carrier is detected to be in an idle state in the CCA interval before the to-be-transmitted preambles.