Methods and apparatuses for random access procedure

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus to:
• receive a random access request from another apparatus during a two-step random access procedure, the random access request comprising a message a;
• transmit a physical downlink control channel with a random access response identified with a cell radio network temporary identifier, while a message b response window is running, in response to the random access request comprising the message a having included the cell radio network temporary identifier;
• transmit the physical downlink control channel with the random access response identified with a message b radio network temporary identifier, while the message b response window is running;
• wherein the message b radio network temporary identifier is different from a random access radio network temporary identifier and the cell radio network temporary identifier;
• wherein the random access response comprises a message b response, in response to the message a;
• determine whether the another apparatus is in an active time to monitor the physical downlink control channel based on whether the message b response window for the two-step random access procedure is running;
• determine whether at least one discontinuous reception timer in the another apparatus has been started with a media access control entity of the another apparatus based on a successful transmission of the physical downlink control channel addressed to the cell radio network temporary identifier while the message b response window is running;
• and
• determine whether the at least one discontinuous reception timer in the another apparatus has been started with the media access control entity of the another apparatus based on a successful transmission of the physical downlink control channel addressed to the message b radio network temporary identifier while the message b response window is running.

A method comprising:

• transmitting, at an apparatus, a random access request to another apparatus during a two-step random access procedure, the random access request comprising a message a;
• starting, at the apparatus, a message b response window for the two-step random access procedure, in response to transmitting the random access request comprising the message a;
• monitoring, with a media access control entity of the apparatus, a physical downlink control channel for a random access response identified with a cell radio network temporary identifier, while the message b response window is running, in response to the random access request comprising the message a having included the cell radio network temporary identifier;
• monitoring, with the media access control entity of the apparatus, the physical downlink control channel for the random access response identified with a message b radio network temporary identifier, while the message b response window is running;
• wherein the message b radio network temporary identifier is different from a random access radio network temporary identifier and the cell radio network temporary identifier;
• wherein the random access response comprises a message b response, in response to the message a;
• wherein the apparatus is in an active time to monitor the physical downlink control channel while the message b response window is running;
• starting, with the media access control entity of the apparatus, at least one discontinuous reception timer in a case of receiving a physical downlink control channel transmission addressed to the cell radio network temporary identifier while the message b response window is running;
• and
• starting, with the media access control entity of the apparatus, the at least one discontinuous reception timer in a case of receiving the physical downlink control channel transmission addressed to the message b radio network temporary identifier while the message b response window is running.