Synchronization Method and Device, Synchronization System, and Computer-Readable Storage Medium

A synchronization method, comprising:

• receiving, by a second device, signals at frequency points F1 to FN in sequence, and detecting a first Primary Synchronization Signal (PSS) sequence, wherein the frequency points F1 to FN are N different frequency points, and N is a natural number greater than or equal to 1;
• when the first PSS sequence is detected, obtaining, by the second device, first half-frame synchronization information, and detecting first Physical Downlink Shared Channel (PDSCH) control information according to the obtained first half-frame synchronization information;
• when the first PDSCH control information is detected, obtaining, by the second device, first frame synchronization information, and entering a pre-synchronization state;
• sending, by the second device, a second PSS sequence and second PDSCH control information at frequency points f1 to fM in sequence, wherein the second PSS sequence and the second PDSCH control information are used for a first device to detect the second PSS sequence and detect the second PDSCH control information, the frequency points f1 to fM are M different frequency points, and M is a natural number greater than or equal to 1;
• and
• after detecting that the first device enters a synchronization state, entering, by the second device, a synchronization state,
• wherein the first PSS sequence is used for the second device to detect the first PSS sequence, and the first PDSCH control information is used for the second device to detect the first PDSCH control information.

A synchronization method, comprising:

• periodically sending, by a first device, a first Primary Synchronization Signal (PSS) sequence and first Physical Downlink Shared Channel (PDSCH) control information at frequency points F1 to FN in sequence, wherein a frequency point conversion period of the frequency points F1 to FN of the first device is T1 ms, the frequency points F1 to FN are N different frequency points, and N is a natural number greater than or equal to 1;
• receiving, by a second device, signals at the frequency points F1 to FN in sequence, and detecting the first PSS sequence, wherein a frequency point conversion period of the frequency points F1 to FN of the second device is T1/(2N) ms;
• when the first PSS sequence is detected, obtaining, by the second device, first half-frame synchronization information, starting Carrier Frequency Offset (CFO) detection to obtain a CFO estimation value, and detecting the first PDSCH control information according to the obtained first half-frame synchronization information and the CFO estimation value;
• when the first PDSCH control information is detected, obtaining, by the second device, first frame synchronization information, and entering a pre-synchronization state;
• sending, by the second device, a second PSS sequence and second PDSCH control information at frequency points f1 to fM in sequence, wherein the frequency points f1 to fM are M different frequency points, and M is a natural number greater than or equal to 1;
• receiving, by the first device, signals at the frequency points f1 to fM in sequence, and detecting the second PSS sequence;
• when the second PSS sequence is detected, obtaining, by the first device, second half-frame synchronization information, and detecting the second PDSCH control information according to the obtained second half-frame synchronization information;
• when the second PDSCH control information is detected, obtaining, by the first device, second frame synchronization information, and entering a synchronization state;
• and
• after detecting that the first device enters a synchronization state, entering, by the second device, a synchronization state.