US 11,991,747 B2
Method and device for random access on unlicensed band
Yang Liu, Beijing (CN)
Assigned to BEIJING XIAOMI MOBILE SOFTWARE CO., LTD., Beijing (CN)
Appl. No. 17/298,920
Filed by BEIJING XIAOMI MOBILE SOFTWARE CO., LTD., Beijing (CN)
PCT Filed Jan. 17, 2019, PCT No. PCT/CN2019/072242
§ 371(c)(1), (2) Date Jun. 1, 2021,
PCT Pub. No. WO2020/147088, PCT Pub. Date Jul. 23, 2020.
Prior Publication US 2022/0070931 A1, Mar. 3, 2022
Int. Cl. H04W 74/0816 (2024.01); H04W 72/0446 (2023.01); H04W 74/08 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 74/0816 (2013.01) [H04W 72/0446 (2013.01); H04W 74/0841 (2013.01); H04W 74/0866 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for random access, comprising:
receiving, by a terminal, physical random access channel (PRACH) configuration information sent by a base station of an unlicensed frequency band cell;
determining, by the terminal, a first time-domain resource occupied by PRACH based on the PRACH configuration information, wherein the first time-domain resource is located after a second time-domain resource occupied by a discovery signal sent by the base station to the terminal;
determining, by the terminal, a target channel access mechanism employed based on a time interval duration between the first time-domain resource and the second time-domain resource;
performing, by the terminal, channel detection according to the target channel access mechanism, and sending, by the terminal, random access information to the base station based on a channel detection result;
acquiring, by the terminal, a period corresponding to the discovery signal and a period corresponding to the PRACH;
in response to determining that the period corresponding to the discovery signal overlaps with the period corresponding to the PRACH, determining, by the terminal, from the time interval duration between the first time-domain resource and the second time-domain resource that steps of the target channel access mechanism employed start to execute; and
in response to determining that the period corresponding to the discovery signal does not overlap with the period corresponding to the PRACH, performing, by the terminal, the channel detection according to a default channel access mechanism, and sending, by the terminal, the random access information to the base station based on the channel detection result.