US-12628181-B2 - Data receiving method and apparatus and data sending method and apparatus

Abstract

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.

Inventors

• Hongjian Yang
• Lei Guan
• Jinhuan Xia
• Ruixiang Ma
• Bingzhao LI

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260512

Application Date

20230711

Claims (18)

1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/071163, filed on Jan. 12, 2021, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This disclosure relates to the communication field, and more specifically, to a data receiving method and apparatus and a data sending method and apparatus. BACKGROUND In a 5th generation (5G) mobile communication system, a network device may schedule, by using downlink control information (DCI) scrambled by using a radio network temporary identifier (RNTI), a downlink data channel scrambled by using the RNTI. After receiving the DCI scrambled by using the RNTI, a terminal device may receive the downlink data channel based on the DCI, and may determine, based on the RNTI, a function of a downlink assignment index (DAI) domain and/or a frequency domain resource assignment (FDRA) domain included in the DCI. However, when the received DCI is scrambled by using a first RNTI, and the downlink data channel scheduled by using the DCI is scrambled by using a second RNTI different from the first RNTI, the terminal device cannot determine whether the function of the DAI domain and/or the FDRA domain in the DCI corresponds to the first RNTI or the second RNTI. Consequently, the terminal device and the network device cannot uniformly understand information in the DCI. SUMMARY This disclosure provides a data receiving method and apparatus. When a scrambling identifier of DCI for scheduling a downlink data channel is different from a scrambling identifier of a scheduled downlink data channel, a terminal device and a network device can uniformly understand information in the DCI, and correct data transmission is performed based on the information in the DCI. According to a first aspect, a data receiving method is provided. The data receiving method may be performed by a terminal device, or may be performed by a chip or a circuit disposed in a terminal device. This is not limited in this disclosure. The data receiving method includes: receiving first downlink control information (DCI), where cyclic redundancy check (CRC) of the first DCI is scrambled by using a first radio network temporary identifier (RNTI), the first DCI is used to schedule a first downlink data channel, the first downlink data channel is scrambled by using a second RNTI, the first downlink data channel is scheduled in a public frequency resource, the public frequency resource is configured in a bandwidth part (BWP), the BWP is a dedicated BWP configured for the terminal device, the first DCI includes a downlink assignment index (DAI) domain and/or a frequency domain resource assignment (FDRA) domain, the DAI domain indicates a count of first hybrid automatic repeat request-acknowledgment (HARQ-ACK) information in a first HARQ-ACK codebook, the first HARQ-ACK information corresponds to the first downlink data channel, the first HARQ-ACK codebook corresponds to the first RNTI, and the FDRA domain indicates, within a frequency domain range of the public frequency resource, a scheduled frequency domain resource on the first downlink data channel; and receiving the first downlink data channel based on the first DCI. According to the data receiving method provided in this embodiment, in a scenario in which the DCI scrambled by using the first RNTI schedules the first data channel scrambled by using the second RNTI, the terminal device and a network device may align functions of the DAI domain and/or the FDRA domain in the DCI, so that correct data transmission can be performed based on information in the DCI. With reference to the first aspect, in some implementations of the first aspect, the method further includes: The first RNTI is a first cell radio network temporary identifier (C-RNTI), and the second RNTI is a first group radio network temporary identifier (G-RNTI). Further, the first RNTI is a unicast identifier, and the second RNTI is a multicast identifier. In other words, the method provided in this embodiment may be applied to a scenario in which DCI scrambled by using a unicast identifier schedules a downlink data channel scrambled by using a multicast identifier. With reference to the first aspect, in some implementations of the first aspect, the FDRA domain corresponds to a first bit sequence, and a part of bits in the first bit sequence form a second bit sequence, or the first bit sequence is padded with at least one bit to form the second bit sequence. The second bit sequence is used to parse, within the frequency domain range of the public frequency resource, the scheduled frequency domain resource on the first downlink data channel. With reference to the first aspect, in some implementations of the first aspect, a corresponding quantity of bits obtained when the FDRA domain is parsed based on a frequency domain range of the BWP is a first value, and a corresponding quantity of bits obtained when the FD