Patent ID: 11963233
Assignee: BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. 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.