Random access method and apparatus, and user equipment and network device

A random access method, the method comprising:

• a network device receives a first message transmitted by a user equipment (UE), and transmits a scheduling instruction of a second message in a first window, wherein the first message comprises a preamble and an uplink data channel;
• wherein the second message comprises at least one of the following:
• a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE, the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE;
• the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
• the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
• the second conflict resolution identifier;
• and
• a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
• the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.

A random access device, which is applied to a user equipment (UE), and the device comprising:

• a transmitter, configured to transmit a first message, wherein the first message comprises a preamble and an uplink data channel;
• a receiver, configured to detect a scheduling instruction of a second message in a first window;
• wherein the second message comprises at least one of the following:
• a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE;
• the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE;
• the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
• the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
• the second conflict resolution identifier;
• and
• a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
• the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.

A random access device, which is applied to a network device, the device comprising:

• a receiver, configured to receive a first message sent by a user equipment (UE), wherein the first message comprises a preamble and an uplink data channel;
• a transmitter, configured to transmit a scheduling instruction of a second message in a first window;
• wherein the second message comprises at least one of the following:
• a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE;
• the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE;
• the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
• the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
• the second conflict resolution identifier;
• and
• a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
• the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.