US 12,232,177 B2
Random access method and communication apparatus
Chunhua You, Shanghai (CN); Qufang Huang, Shenzhen (CN); Xiaoying Xu, Shanghai (CN); Yinghao Guo, Shanghai (CN); and Chong Lou, Shanghai (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Dec. 28, 2021, as Appl. No. 17/563,815.
Application 17/563,815 is a continuation of application No. PCT/CN2020/098394, filed on Jun. 28, 2020.
Claims priority of application No. 201910573570.2 (CN), filed on Jun. 28, 2019.
Prior Publication US 2022/0124826 A1, Apr. 21, 2022
Int. Cl. H04W 74/0833 (2024.01)
CPC H04W 74/0833 (2013.01) 20 Claims
OG exemplary drawing
 
1. A two-step random access method comprising:
sending, by a terminal device, a random access request message to a network device, wherein the random access request message includes a preamble and payload data;
receiving, by the terminal device, a response message from the network device,
wherein the response message is known by the terminal device to be a response in a two-step random access method;
determining, by the terminal device, a message format of the response message based on indication information received by the terminal device from the network device,
wherein the message format comprises a first format or a second format; and
parsing, by the terminal device, the response message based on the determined message format for the purpose of determining whether the response message is for the terminal device,
wherein the response message in the first format comprises a contention resolution identity and a radio resource control (RRC) message,
wherein the response message in the second format comprises a contention resolution identity without any RRC message,
wherein both the indication information and the response message in the first format and in the second format are carried in a medium access control (MAC) protocol data unit (PDU),
wherein the MAC PDU comprises a first MAC subPDU and a second MAC subPDU,
wherein the contention resolution identity in the response message in the first format is carried in the first MAC subPDU, and
wherein a control plane message in the response message in the first format is carried in the second MAC subPDU.