Data transmission method, related device, and system

A data transmission method, comprising:

• receiving, by a second communications device, a first indication information on M of N time-frequency resources, wherein the first indication information is used to indicate that the N time-frequency resources are used by a first communications device to send to-be-transmitted data;
• any two of the N time-frequency resources are nonconsecutive in at least one of a time domain and a frequency domain;
• each of the N time-frequency resources is smaller than a time-frequency resource for transmitting the to-be-transmitted data, and a sum of the N time-frequency resources is greater than or equal to the time-frequency resource for transmitting the to-be-transmitted data;
• and N is a positive integer greater than or equal to 2, and M is a positive integer less than or equal to N;
• and
• receiving, by the second communications device, the to-be-transmitted data on the N time-frequency resources.

A first communications device, comprising:

• a determining unit, configured to determine N time-frequency resources, wherein any two of the N time-frequency resources are nonconsecutive in at least one of a time domain and a frequency domain;
• each of the N time-frequency resources is smaller than a time-frequency resource for transmitting to-be-transmitted data, and a sum of the N time-frequency resources is greater than or equal to the time-frequency resource for transmitting the to-be-transmitted data;
• and N is a positive integer greater than or equal to 2;
• and
• a sending unit, configured to send a first indication information on M of the N time-frequency resources, wherein the first indication information is used to indicate that the N time-frequency resources are used by the first communications device to send the to-be-transmitted data, and M is a positive integer less than or equal to N;
• and
• the sending unit is further configured to send the to-be-transmitted data on the N time-frequency resources.