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

Claim 0:
1. A method for transmitting a random access message, comprising:
in a random access process based on an unlicensed channel, performing, by a terminal, 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, by the terminal, 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 performing random access preamble transmission in the first RO in the LBT mode comprises: 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; and
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.