Data communication method and system

A data communication system, comprising a first terminal and a second terminal, wherein

• the first terminal comprises a processor and a memory having an instruction stored thereon, the first terminal is configured to generate communication carrier signal continuously during communication with the second terminal;
• the first terminal is further configured to send a communication data signal carrying a data packet to be processed, and begin to detect a first phase difference between a waveform phase of the communication carrier signal and a first initial phase when the first terminal completes sending the data packet to be processed, wherein the first initial phase is the waveform phase of the communication carrier signal when the first terminal completes sending the data packet to be processed, and the communication data signal is obtained by the first terminal by means of modulating the data packet to be processed onto the communication carrier signal;
• the second terminal comprises a processor and a memory having an instruction stored thereon, the second terminal is configured to receive the communication data signal carrying the data packet to be processed, and begin to detect a second phase difference between the waveform phase of the communication carrier signal and a second initial phase when the second terminal completes receiving the data packet to be processed, and generate a reply packet based on the data packet to be processed, wherein the second initial phase is the waveform phase of the communication carrier signal when the second terminal completes receiving the data packet to be processed;
• the second terminal is further configured to send the reply packet to the first terminal when detecting that the second phase difference reaches a threshold phase difference Δφ;
• the first terminal is further configured to allow to start receiving the reply packet when detecting that the first phase difference is within a threshold range, wherein the threshold range is obtained by the first terminal based on the threshold phase difference Δφ;
• wherein, the threshold phase difference Δφ is stored in preset factory information of the first terminal and the second terminal, wherein Δφ≤λ, λ is a phase variation value of the communication carrier signal generated within a frame waiting time specified in a communication protocol adopted by the first terminal and the second terminal.

A data communication method, wherein, a first terminal continuously generates communication carrier signals during communication with a second terminal, the method comprises:

• the first terminal sending a communication data signal carrying a data packet to be processed, and the first terminal beginning to detect a first phase difference between a waveform phase of the communication carrier signal and a first initial phase when the first terminal completes sending the data packet to be processed, wherein the first initial phase is the waveform phase of the communication carrier signal when the first terminal completes sending the data packet to be processed, and the communication data signal is obtained by the first terminal by means of modulating the data packet to be processed onto the communication carrier signal;
• the second terminal receiving the communication data signal carrying the data packet to be processed, and the second terminal beginning to detect a second phase difference between the waveform phase of the communication carrier signal and a second initial phase when the second terminal completes receiving the data packet to be processed, and generating a reply packet based on the data packet to be processed, wherein the second initial phase is the waveform phase of the communication carrier signal when the second terminal completes receiving the packet to be processed;
• the second terminal sending the reply packet to the first terminal when detecting that the second phase difference reaches a threshold phase difference Δφ;
• and
• the first terminal allowing to start receiving the reply packet when detecting that the first phase difference reaches the threshold phase difference Δφ;
• wherein, the threshold phase difference Δφ is stored in preset factory information of the first terminal and the second terminal, wherein Δφ≤λ, λ is a phase variation value of the communication carrier signal generated within the frame waiting time specified in the communication protocol adopted by the first terminal and the second terminal.