Communications method and apparatus
This application provides a communications method and apparatus, to improve data transmission reliability. The method includes: determining, by a terminal device, M pilot ports that are used to transmit one data stream, where M is a positive integer greater than or equal to 2; and sending, by the terminal device to a network device, M pilot signals and the data stream that have been subject to same precoding processing, where the M pilot signals are respectively generated based on the M pilot ports.
1. A communications method comprising:
determining, by a terminal device, M pilot ports used to transmit one data stream, wherein M is a positive integer greater than or equal to 2, wherein any two of the M pilot ports belong to a same pilot port set and any two pilot ports in the same pilot port set correspond to a same time-frequency resource, wherein pilot sequences corresponding to any two different pilot ports are orthogonal, wherein a time-frequency resource corresponding to any pilot port in a first pilot port set is orthogonal to a time-frequency resource corresponding to any pilot port in a second pilot port set; and
sending, by the terminal device to a network device, M pilot signals and the data stream that have been subject to a same precoding processing, wherein the M pilot signals are respectively generated based on the M pilot ports.
2. The method according to claim 1 , wherein a first pilot port in the M pilot ports belongs to the first pilot port set; a second pilot port in the M pilot ports belongs to the second pilot port set; pilot signals corresponding to any two pilot ports in the first pilot port set occupy a same time-frequency resource; and any two pilot ports in the second pilot port set correspond to a same time-frequency resource.
3. A communications method comprising:
determining, by a network device, M pilot ports used by a terminal device to transmit one data stream, wherein M is a positive integer greater than or equal to 2, wherein any two of the M pilot ports belong to a same pilot port set and any two pilot ports in the same pilot port set correspond to a same time-frequency resource, wherein pilot sequences corresponding to any two different pilot ports are orthogonal, wherein a time-frequency resource corresponding to any pilot port in a first pilot port set is orthogonal to a time-frequency resource corresponding to any pilot port in a second pilot port set;
sending, by the network device, first indication information to the terminal device, wherein the first indication information is used to indicate the M pilot ports; and
receiving, by the network device, M pilot signals and the data stream that have been subject to a same precoding processing and that are sent by the terminal device, wherein the M pilot signals are respectively generated based on the M pilot ports.
4. The method according to claim 3 , wherein a first pilot port in the M pilot ports belongs to the first pilot port set; a second pilot port in the M pilot ports belongs to the second pilot port set; pilot signals corresponding to any two pilot ports in the first pilot port set occupy a same time-frequency resource; and any two pilot ports in the second pilot port set correspond to a same time-frequency resource.
5. A communications apparatus comprising:
a determining unit configured to determine M pilot ports used to transmit one data stream, wherein M is a positive integer greater than or equal to 2, wherein any two of the M pilot ports belong to a same pilot port set and any two pilot ports in the same pilot port set correspond to a same time-frequency resource, wherein pilot sequences corresponding to any two different pilot ports are orthogonal, wherein a time-frequency resource corresponding to any pilot port in a first pilot port set is orthogonal to a time-frequency resource corresponding to any pilot port in a second pilot port set; and
a transceiver unit configured to send to a network device, M pilot signals and the data stream that have been subject to a same precoding processing, wherein the M pilot signals are respectively generated based on the M pilot ports.
6. The apparatus according to claim 5 , wherein a first pilot port in the M pilot ports belongs to the first pilot port set; a second pilot port in the M pilot ports belongs to the second pilot port set; pilot signals corresponding to any two pilot ports in the first pilot port set occupy a same time-frequency resource; and any two pilot ports in the second pilot port set correspond to a same time-frequency resource.
7. A communications apparatus comprising:
a determining unit configured to determine M pilot ports used by a terminal device to transmit one data stream, wherein M is a positive integer greater than or equal to 2, wherein any two of the M pilot ports belong to a same pilot port set and any two pilot ports in the same pilot port set correspond to a same time-frequency resource, wherein pilot sequences corresponding to any two different pilot ports are orthogonal, wherein a time-frequency resource corresponding to any pilot port in a first pilot port set is orthogonal to a time-frequency resource corresponding to any pilot port in a second pilot port set; and
a transceiver unit configured to send first indication information to the terminal device, wherein the first indication information is used to indicate the M pilot ports, wherein
the transceiver unit is further configured to receive M pilot signals and the data stream that have been subject to a same precoding processing and that are sent by the terminal device, wherein the M pilot signals are respectively generated based on the M pilot ports.
8. The apparatus according to claim 7 , wherein a first pilot port in the M pilot ports belongs to the first pilot port set; a second pilot port in the M pilot ports belongs to the second pilot port set; pilot signals corresponding to any two pilot ports in the first pilot port set occupy a same time-frequency resource; and any two pilot ports in the second pilot port set correspond to a same time-frequency resource.