US 12,309,848 B2
Random access method and apparatus
Li Zhao, Shanghai (CN); and Xiaoying Xu, Shanghai (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Oct. 29, 2021, as Appl. No. 17/515,045.
Application 17/515,045 is a continuation of application No. PCT/CN2020/087698, filed on Apr. 29, 2020.
Claims priority of application No. 201910360371.3 (CN), filed on Apr. 30, 2019.
Prior Publication US 2022/0053558 A1, Feb. 17, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 24/08 (2009.01); H04W 72/23 (2023.01); H04W 74/00 (2009.01); H04W 74/08 (2024.01); H04W 74/0836 (2024.01)
CPC H04W 74/0836 (2024.01) [H04W 24/08 (2013.01); H04W 72/23 (2023.01); H04W 74/004 (2013.01); H04W 74/0833 (2013.01); H04W 74/085 (2013.01); H04W 74/0866 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A random access method applied to a terminal device, the method comprising:
receiving configuration information of at least two monitoring windows from a network device;
wherein the at least two monitoring windows at least partially overlap;
based on the configuration information, initiating parallel 2-step and 4-step random access procedures by
sending, to the network device, a random access signal and a physical uplink shared channel (PUSCH) comprising first information used for contention resolution,
wherein the random access signal is used to request random access based on either the 2-step or 4-step random access procedure, and
wherein the first information includes an identifier of the terminal device;
starting or restarting, by the terminal device, the at least two monitoring windows on a first symbol after sending the PUSCH;
monitoring, by the terminal device, for receipt of a first response and a second response to the random access signal and PUSCH, respectively, in respective one of the at least two monitoring windows,
wherein the first response is associated with both the 2-step and 4-step random access procedures, and
wherein the second response is associated with only the 2-step random access procedures,
in response to detecting the first response in a first of the at least two monitoring windows, performing, by the terminal, backoff from the 2-step random access procedure and continuing the 4-step random access procedure while continuing to monitor for receipt of the second response during a second of the at least two monitoring windows; and
stopping, by the terminal, the first of the at least two monitoring windows based on detecting the second response in the second of the at least two monitoring windows and determining that the contention resolution succeeds based on the 2-step random access procedure.