US 12,408,225 B2
Method and apparatus for performing random access
Le Yan, Shanghai (CN); Haiming Wang, Beijing (CN); Mingzeng Dai, Shanghai (CN); Lianhai Wu, Beijing (CN); and Congchi Zhang, Shanghai (CN)
Assigned to Lenovo (Beijing) Limited, Beijing (CN)
Appl. No. 18/270,345
Filed by Lenovo (Beijing) Limited, Beijing (CN)
PCT Filed Dec. 31, 2020, PCT No. PCT/CN2020/142249
§ 371(c)(1), (2) Date Jun. 29, 2023,
PCT Pub. No. WO2022/141438, PCT Pub. Date Jul. 7, 2022.
Prior Publication US 2024/0121832 A1, Apr. 11, 2024
Int. Cl. H04W 76/19 (2018.01); H04L 1/1607 (2023.01); H04W 74/0833 (2024.01); H04W 74/0836 (2024.01); H04W 76/18 (2018.01)
CPC H04W 76/19 (2018.02) [H04L 1/1607 (2013.01); H04W 74/0833 (2013.01); H04W 74/0836 (2024.01); H04W 76/18 (2018.02)] 14 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a memory; and
a processor coupled to the memory, the processor configured to cause the apparatus to:
perform a 2-step random access (RA) procedure with a base station;
receive a fallback RA response (RAR) from the base station;
perform a 4-step RA procedure with the base station according to the fallback RAR;
set a first index to 2-step RA information of the 2-step RA procedure;
associate the 2-step RA information of the 2-step RA procedure with a 4-step RA information of the 4-step RA procedure by setting a second index to the 4-step RA information of the 4-step RA procedure, wherein the second index of the 4-step RA information follows the first index of the 2-step RA information;
perform another 2-step RA procedure with the base station when the 4-step RA procedure fails and a maximum transmission number of a message A (MSG-A) is not reached; and
set a third index to another 2-step RA information of the another 2-step RA procedure, wherein the third index of the another 2-step RA information follows the second index of the 4-step RA information.