Data receiving method and apparatus and data sending method and apparatus
A data transmission (including receiving and sending) method is disclosed. According to the data transmission method, a terminal device receives downlink control information (DCI), where cyclic redundancy check (CRC) of the DCI is scrambled by using a first RNTI, the DCI is used to schedule a first downlink data channel, and the first downlink data channel is scrambled by using a second RNTI; and the terminal device receives the first downlink data channel based on the DCI. The DCI includes a DAI domain and/or an FDRA domain. The DAI domain indicates a count of first HARQ-ACK information in a first HARQ-ACK codebook, and the first HARQ-ACK codebook corresponds to the first RNTI. The FDRA domain indicates, within a frequency domain range of a public frequency resource, a scheduled frequency domain resource on the first downlink data channel.
1 . A data receiving method, comprising:
receiving, by a terminal device, second downlink control information (DCI), wherein the terminal device is configured to monitor the second DCI and third DCI;
a second downlink data channel is scheduled using the second DCI, a third downlink data channel is scheduled using the third DCI, cyclic redundancy check (CRC) of the second DCI is scrambled by using a third radio network temporary identifier (RNTI), CRC of the third DCI is scrambled by using a fourth RNTI; the second DCI comprises a first hybrid automatic repeat request process number (HPN) domain and a first new data indicator (NDI) domain, and the third DCI comprises a second HPN domain and a second NDI domain;
receiving, by the terminal device, fourth DCI, wherein a fourth downlink data channel is scheduled using the fourth DCI, CRC of the fourth DCI is scrambled by using a fifth RNTI, and the fourth DCI comprises a third HPN domain and a third NDI domain;
determining, by the terminal device based on a time window corresponding to the third RNTI, that the fifth RNTI is associated with the third RNTI; and
receiving, by the terminal device, the fourth downlink data channel.
2 . The method according to claim 1 , wherein the third RNTI is a second group radio network temporary identifier (G-RNTI), the fourth RNTI is a third G-RNTI, and the fifth RNTI is a second cell radio network temporary identifier (C-RNTI).
3 . The method according to claim 1 , wherein, when a value of the first HPN domain is equal to a value of the third HPN domain, the method further comprises:
determining, by the terminal device based on a value of the third NDI domain, that the fourth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet; or
determining, by the terminal device based on a value of the third NDI domain and a value of the first NDI domain, that the fourth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet, wherein
the newly transmitted data packet is different from a data packet carried on the second downlink data channel, and the retransmitted data packet is the same as the data packet carried on the second downlink data channel.
4 . The method according to claim 1 , wherein
a value of the first HPN domain is equal to a value of the second HPN domain.
5 . A data sending method, comprising:
sending, by a network device, second downlink control information (DCI) to a terminal device, wherein the terminal device is configured to monitor the second DCI and third DCI, wherein
a second downlink data channel is scheduled using the second DCI, a third downlink data channel is scheduled using the third DCI, cyclic redundancy check (CRC) of the second DCI is scrambled by using a third radio network temporary identifier (RNTI), CRC of the third DCI is scrambled by using a fourth RNTI; the second DCI comprises a first hybrid automatic repeat request process number (HPN) domain and a first new data indicator (NDI) domain, and the third DCI comprises a second HPN domain and a second NDI domain;
sending, by the network device, fourth DCI to the terminal device, wherein a fourth downlink data channel is scheduled using the fourth DCI, CRC of the fourth DCI is scrambled by using a fifth RNTI, the fourth DCI comprises a third HPN domain and a third NDI domain, and it is determined that the fifth RNTI is associated with the third RNTI based on a time window corresponding to the third RNTI; and
sending, by the network device, the fourth downlink data channel to the terminal device.
6 . The method according to claim 5 , wherein the fourth DCI carries first indication information indicating that the fifth RNTI is associated with the third RNTI; or
the method further comprises:
sending, by the network device, signaling at a layer higher than a physical layer, wherein the signaling carries second indication information indicating that the fifth RNTI is associated with the third RNTI.
7 . The method according to claim 5 , wherein the third RNTI is a second group radio network temporary identifier (G-RNTI), the fourth RNTI is a third G-RNTI, and the fifth RNTI is a second cell radio network temporary identifier (C-RNTI).
8 . The method according to claim 5 , wherein, when a value of the first HPN domain is equal to a value of the third HPN domain,
a value of the third NDI domain is used to determine that a fifth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet;
or
a value of the third NDI domain and a value of the first NDI domain are used to determine that the fifth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet, wherein
the newly transmitted data packet is different from a data packet carried on the third downlink data channel, and the retransmitted data packet is the same as the data packet carried on the third downlink data channel.
9 . The method according to claim 5 , wherein a value of the first HPN domain is equal to a value of the second HPN domain.
10 . An apparatus, comprising: one or more processors configured to receive second downlink control information (DCI), wherein the apparatus is configured to monitor the second DCI and third DCI; a second downlink data channel is scheduled using the second DCI, a third downlink data channel is scheduled using the third DCI, cyclic redundancy check (CRC) of the second DCI is scrambled by using a third radio network temporary identifier (RNTI), CRC of the third DCI is scrambled by using a fourth RNTI; the second DCI comprises a first hybrid automatic repeat request process number (HPN) domain and a first new data indicator (NDI) domain, and the third DCI comprises a second HPN domain and a second NDI domain;
receive fourth DCI, wherein a fourth downlink data channel is scheduled using the fourth DCI, CRC of the fourth DCI is scrambled by using a fifth RNTI, and the fourth DCI comprises a third HPN domain and a third NDI domain;
determine based on a time window corresponding to the third RNTI that the fifth RNTI is associated with the third RNTI; and
receive the fourth downlink data channel.
11 . The apparatus according to claim 10 , wherein the third RNTI is a second group radio network temporary identifier (G-RNTI), the fourth RNTI is a third G-RNTI, and the fifth RNTI is a second cell radio network temporary identifier (C-RNTI).
12 . The apparatus according to claim 10 , wherein, when a value of the first HPN domain is equal to a value of the third HPN domain, the one or more processors are further configured to:
determine based on a value of the third NDI domain, that the fourth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet; or
determine based on a value of the third NDI domain and a value of the first NDI domain, that the fourth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet, wherein
the newly transmitted data packet is different from a data packet carried on the second downlink data channel, and the retransmitted data packet is the same as the data packet carried on the second downlink data channel.
13 . The apparatus according to claim 10 , wherein
a value of the first HPN domain is equal to a value of the second HPN domain.
14 . An apparatus, comprising: one or more processors configured to send second downlink control information (DCI) to a terminal device, wherein the terminal device is configured to monitor the second DCI and third DCI, wherein
a second downlink data channel is scheduled using the second DCI, a third downlink data channel is scheduled using the third DCI, cyclic redundancy check (CRC) of the second DCI is scrambled by using a third radio network temporary identifier (RNTI), CRC of the third DCI is scrambled by using a fourth RNTI; the second DCI comprises a first hybrid automatic repeat request process number (HPN) domain and a first new data indicator (NDI) domain, and the third DCI comprises a second HPN domain and a second NDI domain;
send fourth DCI to the terminal device, wherein a fourth downlink data channel is scheduled using the fourth DCI, CRC of the fourth DCI is scrambled by using a fifth RNTI, the fourth DCI comprises a third HPN domain and a third NDI domain, and it is determined that the fifth RNTI is associated with the third RNTI based on a time window corresponding to the third RNTI; and
send the fourth downlink data channel to the terminal device.
15 . The apparatus according to claim 14 , wherein the fourth DCI carries first indication information, and the first indication information indicates that the fifth RNTI is associated with the third RNTI; or
the one or more processors are further configured to:
send signaling at a layer higher than a physical layer, wherein the signaling carries second indication information, and the second indication information indicates that the fifth RNTI is associated with the third RNTI.
16 . The apparatus according to claim 14 , wherein the third RNTI is a second group radio network temporary identifier (G-RNTI), the fourth RNTI is a third G-RNTI, and the fifth RNTI is a second cell radio network temporary identifier (C-RNTI).
17 . The apparatus according to claim 14 , wherein, when a value of the first HPN domain is equal to a value of the third HPN domain,
a value of the third NDI domain is used to determine that a fifth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet;
or
a value of the third NDI domain and a value of the first NDI domain are used to determine that the fifth downlink data channel carries a newly transmitted data packet or carries a retransmitted data packet, wherein
the newly transmitted data packet is different from a data packet carried on the third downlink data channel, and the retransmitted data packet is the same as the data packet carried on the third downlink data channel.
18 . The apparatus according to claim 14 , wherein a value of the first HPN domain is equal to a value of the second HPN domain.