Random access method, terminal device and network device
View Patent ↗The embodiments of the present application relate to a random access method, a terminal device and a network device, the method comprising: a terminal device sending a first message to a network device, the first message comprising a random access preamble and a first physical uplink shared channel (PUSCH), the first PUSCH comprising data obtained by carrying out rate matching on a first transmission block; and the terminal device receiving first downlink control information (DCI) or second DCI sent by the network device for the first message. The random access method, terminal device and network device of the embodiments of the present application may allow a terminal to distinguish between two conditions under which a network device receives a first message within a two-step random access process.
1. A random access method, comprising:
sending, by a terminal device, a first message to a network device, wherein the first message comprises a random access preamble and a first physical uplink shared channel (PUSCH), and the first PUSCH comprises data of a first transport block after rate matching;
receiving, by the terminal device, first downlink control information (DCI) sent by the network device when the random access preamble is detected successfully and the first transport block is decoded unsuccessfully, wherein the first DCI is sent in response to the first message, and the first DCI is used for scheduling a first physical downlink shared channel (PDSCH), and the first PDSCH comprises information in response to the random access preamble;
receiving, by the terminal device, second downlink control information (DCI) sent by the network device when the random access preamble is detected successfully and the first transport block is decoded successfully, wherein the second DCI is sent in response to the first message; and the second DCI is used for scheduling a second physical downlink shared channel (PDSCH) which comprises data of a second transport block after rate matching, wherein the second transport block comprises information in response to the first transport block;
sending, by the terminal device, a second PUSCH to the network device according to the information in response to the random access preamble if the terminal device receives the first DCI, wherein the second PUSCH comprises data of the first transport block after rate matching;
sending, by the terminal device, a negative acknowledgement to the network device if the terminal device receives the second DCI and fails to decode the second PDSCH in a random access procedure; and sending, by the terminal device, an acknowledgement to the network device if the terminal device receives the second DCI and decodes the second PDSCH in the random access procedure;
wherein the first DCI is scrambled according to a first radio network temporary identifier (RNTI); the second DCI is scrambled according to a second RNTI; the first RNTI and the second RNTI are different.
2. The method according to claim 1 , wherein the second RNTI is determined according to an identifier of the terminal device, wherein the first transport block comprises the identifier of the terminal device.
3. A random access method, comprising:
receiving, by a network device, a first message sent by a terminal device, wherein the first message comprises a random access preamble and a first physical uplink shared channel (PUSCH), and the first PUSCH comprises data of a first transport block after rate matching;
sending, by the network device, first downlink control information (DCI) to the terminal device when the network device detects the random access preamble out successfully and decodes the first transport block unsuccessfully; wherein the first DCI is used for scheduling a first physical downlink shared channel (PDSCH), and the first PDSCH comprises information in response to the random access preamble;
sending, by the network device, second downlink control information (DCI) to the terminal device when the network device detects the random access preamble out successfully and decodes the first transport block successfully; wherein the second DCI is used for scheduling a second physical downlink shared channel (PDSCH) which comprises data of a second transport block after rate matching, wherein the second transport block comprises information in response to the first transport block;
receiving, by the network device, a second PUSCH that is sent according to the information in response to the random access preamble by the terminal device if the first DCI is sent by the network device, wherein the second PUSCH comprises data of the first transport block after rate matching;
receiving, by the network device, a negative acknowledgement sent by the terminal device if the second DCI is received but the second PDSCH fails to be decoded by the terminal device in a random access procedure; and
receiving, by the network device, an acknowledgement sent by the terminal device if the second DCI is received and the second PDSCH is decoded by the terminal device in the random access procedure;
wherein the first DCI is scrambled according to a first radio network temporary identifier fRNTI); the second DCI is scrambled according to a second RNTI; the first RNTI and the second RNTI are different.
4. The method according to claim 3 , wherein the second RNTI is determined according to an identifier of the terminal device, wherein the first transport block comprises the identifier of the terminal device.
5. A terminal device, comprising:
a transceiver, configured to send a first message to a network device, wherein the first message comprises a random access preamble and a first physical uplink shared channel (PUSCH), and the first PUSCH comprises data of a first transport block after rate matching;
wherein the transceiver is further configured to receive first downlink control information (DCI) sent by the network device when the random access preamble is detected successfully and the first transport block is decoded unsuccessfully, wherein the first DCI is sent in response to the first message, and the first DCI is used for scheduling a first physical downlink shared channel (PDSCH), and the first PDSCH comprises information in response to the random access preamble;
wherein the transceiver is further configured to receive second downlink control information (DCI) sent by the network device when the random access preamble is detected successfully and the first transport block is decoded successfully, wherein the second DCI is sent in response to the first message; and the second DCI is used for scheduling a second physical downlink shared channel (PDSCH) which comprises data of a second transport block after rate matching, wherein the second transport block comprises information in response to the first transport block;
the transceiver is further configured to send a second PUSCH to the network device according to the information in response to the random access preamble if the terminal device receives the first DCI, wherein the second PUSCH comprises data of the first transport block after rate matching;
the transceiver is further configured to send a negative acknowledgement to the network device if the terminal device receives the second DCI and fails to decode the second PDSCH in a random access procedure; and send an acknowledgement to the network device if the terminal device receives the second DCI and decodes the second PDSCH in the random access procedure;
wherein the first DCI is scrambled according to a first radio network temporary identifier (RNTI); the second DCI is scrambled according to a second RNTI; the first RNTI and the second RNTI are different.
6. The terminal device according to claim 5 , wherein the second RNTI is determined according to an identifier of the terminal device, wherein the first transport block comprises the identifier of the terminal device.