Method and device for transmitting a random access message, and a storage medium

A device for transmitting a random access message, applied to a terminal, comprising:

• a processor;
• and
• a memory configured to store processor executable instructions,
• wherein the processor is configured to implement acts comprising:
• in a random access process based on an unlicensed channel, performing random access preamble transmission in a first Rach Occasion (RO) in a Listen Before Talk (LBT) mode before arrival of the first RO, the first RO being a first RO selected in the random access process;
• in response to determining that a Random Access Response (RAR) returned by a base station is not received before arrival of a second RO, performing random access preamble transmission in the second RO in the LBT mode, the second RO being any RO within a RAR time window corresponding to the random access process, the RAR time window being a period of a predetermined duration starting after the first RO;
• and
• in response to monitoring that a target frequency domain interval is in an idle state within a preset duration before start of the first RO, sending a random access preamble on one time-frequency unit of at least two time-frequency units corresponding to the first RO so that the device performs random access preamble transmission in the first RO in the LBT mode,
• wherein the target frequency domain interval is a frequency domain interval including a frequency band in which the at least two time-frequency units are located.

A non-transitory computer-readable storage medium having stored therein instructions which, when executed by a processor in a terminal, implement acts comprising:

• in a random access process based on an unlicensed channel, performing random access preamble transmission in a first Rach Occasion (RO) in a Listen Before Talk (LBT) mode before arrival of the first RO, the first RO being a first RO selected in the random access process;
• and
• in response to determining that a Random Access Response (RAR) returned by a base station is not received before arrival of a second RO, performing random access preamble transmission in the second RO in the LBT mode, the second RO being any RO within a RAR time window corresponding to the random access process, the RAR time window being a period of a predetermined duration starting after the first RO,
• wherein the instructions are for performing random access preamble transmission in the first RO in the LBT mode by:
• in response to monitoring that a target frequency domain interval is in an idle state within a preset duration before start of the first RO, sending a random access preamble on one time-frequency unit of at least two time-frequency units corresponding to the first RO,
• wherein the target frequency domain interval is a frequency domain interval including a frequency band in which the at least two time-frequency units are located.