Random access method, terminal device, and network device
View Patent ↗Provided in implementations of the present application are a wireless communication method, a terminal device, and a network device, which may achieve random access on NR unlicensed frequency bands. The wireless communication method comprises: a terminal device sends a first message during random access to a network device on an uplink licensed carrier or an uplink unlicensed carrier, the first message comprising a random access preamble; and the terminal device uses a first RAR format to detect a first RAR for the first message, the first RAR format targeting the unlicensed carrier.
1. A method for wireless communication, comprising:
sending, by a terminal device, a first message in a random access procedure to a network device, wherein the first message comprises a random access preamble; and
detecting, by the terminal device, a first Random Access Response (RAR) for the first message by using a first RAR format or a second RAR format according to a type of an uplink carrier sending the first message, wherein the first RAR format is different from the second RAR format; wherein the uplink carrier is an uplink unlicensed carrier or an uplink licensed carrier, and detecting, by the terminal device, the first RAR for the first message by using the first RAR format or the second RAR format according to the type of the uplink carrier sending the first message comprises:
detecting, by the terminal device, the first RAR by using the first RAR format if the terminal device sends the first message to the network device on the uplink unlicensed carrier; and/or
detecting, by the terminal device, the first RAR by using the second RAR format if the terminal device sends the first message to the network device on the uplink licensed carrier; wherein the first RAR format comprises first information for an unlicensed carrier, and the second RAR format does not comprise the first information; wherein the first information comprises the following information: a Listen Before Talk (LBT) category, used for indicating a channel access mechanism.
2. The method of claim 1 , wherein part or all of information comprised in the first information is identified or indicated by a bitmap.
3. A method of wireless communication, comprising:
receiving, by a network device, a first message in a random access procedure sent by a terminal device, wherein the first message comprises a random access preamble; and
sending, by the network device, a first Random Access Response (RAR) for the first message by using a first RAR format or a second RAR format according to a type of an uplink carrier receiving the first message, wherein the first RAR format is different from the second RAR format; wherein the uplink carrier is an uplink unlicensed carrier or an uplink licensed carrier, and sending, by the network device, the first RAR for the first message by using the first RAR format or the second RAR format according to the type of the uplink carrier receiving the first message comprises:
sending, by the network device, the first RAR by using the first RAR format if the network device receives the first message sent by the terminal device on the uplink unlicensed carrier; and/or
sending, by the network device, the first RAR by using the second RAR format if the network device receives the first message sent by the terminal device on the uplink licensed carrier; wherein the first RAR format comprises first information for an unlicensed carrier, and the second RAR format does not comprise the first information; wherein the first information comprises the following information: a Listen Before Talk (LBT) category, used for indicating a channel access mechanism.
4. The method of claim 3 , wherein part or all of information comprised in the first information is identified or indicated by a bitmap.
5. A terminal device, comprising a memory and a processor, wherein the processor is configured to execute instructions stored in the memory to perform following operation:
sending a first message in a random access procedure to a network device, wherein the first message comprises a random access preamble; and
detecting a first Random Access Response (RAR) for the first message by using a first RAR format or a second RAR format according to a type of an uplink carrier sending the first message, wherein the first RAR format is different from the second RAR format; wherein the uplink carrier is an uplink unlicensed carrier or an uplink licensed carrier, and the processor is specifically configured to execute instructions stored in the memory to perform following operation:
detecting the first RAR by using the first RAR format if the terminal device sends the first message to the network device on the uplink unlicensed carrier; and/or
detecting the first RAR by using the second RAR format if the terminal device sends the first message to the network device on the uplink licensed carrier; wherein the first RAR format comprises first information for an unlicensed carrier, and the second RAR format does not comprise the first information; wherein the first information comprises the following information: a Listen Before Talk (LBT) category, used for indicating a channel access mechanism.
6. The terminal device of claim 5 , wherein part or all of information comprised in the first information is identified or indicated by a bitmap.
7. A network device, comprising a memory and a processor, wherein the processor is configured to execute instructions stored in the memory to perform following operation:
receiving a first message in a random access procedure sent by a terminal device, wherein the first message comprises a random access preamble; and
sending a first Random Access Response (RAR) for the first message by using a first RAR format or a second RAR format according to a type of an uplink carrier receiving the first message, wherein the first RAR format is different from the second RAR format; wherein the uplink carrier is an uplink unlicensed carrier or an uplink licensed carrier, and the processor is specifically configured to execute instructions stored in the memory to perform following operation:
sending the first RAR using the first RAR format if the network device receives the first message sent by the terminal device on the uplink unlicensed carrier; and/or
sending the first RAR using the second RAR format if the network device receives the first message sent by the terminal device on the uplink licensed carrier; wherein the first RAR format comprises first information for an unlicensed carrier, and the second RAR format does not comprise the first information; wherein the first information comprises the following information: a Listen Before Talk (LBT) category, used for indicating a channel access mechanism.
8. The network device of claim 7 , wherein part or all of information comprised in the first information is identified or indicated by a bitmap.