Signal transmission method and apparatus

1. A method, comprising:

obtaining a preset transmit frequency band comprising a first transmit frequency bandwidth, wherein the preset transmit frequency band comprises N sub-frequency bands, and wherein a first sum of bandwidths of the N sub-frequency bands is equal to the first transmit frequency bandwidth;

selecting, based on the preset transmit frequency band, an operating bandwidth of a first detection apparatus, wherein the operating bandwidth is occupied by a waveform of a signal transmitted by the first detection apparatus, wherein the operating bandwidth is greater than a second sum of bandwidths of N−1 of the N sub-frequency bands and is less than the first sum of bandwidths of the N sub-frequency bands, and wherein the operating bandwidth comprises a total bandwidth of the N−1 of the N sub-frequency bands and a portion of a bandwidth of one of the N sub-frequency bands; and

transmitting, on the operating bandwidth, a first signal.

2. The method of claim 1 , wherein a frequency domain range of the preset transmit frequency band is predefined.

3. The method of claim 1 , wherein distribution of the N sub-frequency bands in the preset transmit frequency band satisfies a predefined or pre-configured rule.

4. The method of claim 1 , wherein obtaining the preset transmit frequency band comprises identifying a first detection frequency band in a plurality of detection frequency bands as the preset transmit frequency band, and wherein a first priority of the first detection frequency band is not lower than a second priority of a second detection frequency band in the plurality of detection frequency bands other than the first detection frequency band.

5. The method of claim 1 , wherein obtaining the preset transmit frequency band comprises identifying a first detection frequency band in a plurality of detection frequency bands as the transmit frequency band, and wherein a first idle degree of the first detection frequency band is not lower than a second idle degree of a second detection frequency band in the plurality of detection frequency bands other than the first detection frequency band.

6. The method of claim 1 , wherein obtaining the preset transmit frequency band comprises identifying a first detection frequency band in a plurality of detection frequency bands as the transmit frequency band, and wherein a first energy value of the first detection frequency band is not greater than a second energy value of a second detection frequency band in the plurality of detection frequency bands other than the first detection frequency band.

7. The method of claim 6 , further comprising obtaining the first energy value by detecting a second signal that is received on the first detection frequency band.

8. The method of claim 1 , wherein obtaining the preset transmit frequency band comprises:

detecting whether a first detection frequency band is idle;

selecting, when the first detection frequency band is idle, the first detection frequency band as the preset transmit frequency band; and

selecting, when the first detection frequency band is not idle, the preset transmit frequency band as a second detection frequency band that is idle.

9. The method of claim 8 , wherein detecting whether the first detection frequency band is idle comprises:

obtaining an energy value of the first detection frequency band by detecting a second signal that is received on the first detection frequency band;

detecting that the first detection frequency band is idle when the energy value is less than or equal to a preset value; and

detecting that the first detection frequency band is not idle when the energy value is greater than the preset value.

10. An apparatus, comprising:

a memory configured to store instructions; and

one or more processors coupled to the memory and configured to execute the instructions to cause the apparatus to:

obtain a preset transmit frequency band comprising a first transmit frequency bandwidth, wherein the preset transmit frequency band comprises N sub-frequency bands, and wherein a first sum of bandwidths of the N sub-frequency bands is equal to the first transmit frequency bandwidth;

select, based on the preset transmit frequency band, an operating bandwidth of the apparatus, wherein the operating bandwidth is occupied by a waveform of a signal transmitted by the apparatus, wherein the operating bandwidth is greater than a second sum of bandwidths of N−1 of the N sub-frequency bands and is less than the first sum of bandwidths of the N sub-frequency bands, and wherein the operating bandwidth comprises a total bandwidth of the N−1 of the N sub-frequency bands and a portion of a bandwidth of one of the N sub-frequency bands; and

transmit, on the operating bandwidth, a first signal.

11. The apparatus of claim 10 , wherein a frequency domain range of the preset transmit frequency band is predefined.

12. The apparatus of claim 10 , wherein distribution of the N sub-frequency bands in the preset transmit frequency band satisfies a predefined or pre-configured rule.

13. The apparatus of claim 10 , wherein when executed by the one or more processors, the instructions further cause the apparatus to obtain the preset transmit frequency band by identifying a first detection frequency band in a plurality of detection frequency bands as the preset transmit frequency band, and wherein a first priority of the first detection frequency band is not lower than a second priority of a second detection frequency band in the plurality of detection frequency bands other than the first detection frequency band.

14. The apparatus of claim 10 , wherein when executed by the one or more processors, the instructions further cause the apparatus to obtain the preset transmit frequency band by identifying a first detection frequency band in a plurality of detection frequency bands as the preset transmit frequency band, and wherein a first idle degree of the first detection frequency band is not lower than a second idle degree of a second detection frequency band in the plurality of detection frequency bands other than the first detection frequency band.

15. The apparatus of claim 10 , wherein when executed by the one or more processors, the instructions further cause the apparatus to obtain the preset transmit frequency band by identifying a first detection frequency band in a plurality of detection frequency bands as the preset transmit frequency band, and wherein a first energy value of the first detection frequency band is not greater than a second energy value of a second detection frequency band in the plurality of detection frequency bands other than the first detection frequency band.

16. The apparatus of claim 15 , wherein when executed by the one or more processors, the instructions further cause the apparatus to obtain the first energy value by detecting a second signal that is received on the first detection frequency band.

17. The apparatus of claim 10 , wherein when executed by the one or more processors, the instructions further cause the apparatus to:

detect whether a first detection frequency band is idle;

select, when the first detection frequency band is idle, the first detection frequency band as the preset transmit frequency band; and

select, when the first detection frequency band is not idle, the preset transmit frequency band as a second detection frequency band that is idle.

18. The apparatus of claim 17 , wherein when executed by the one or more processors, the instructions further cause the apparatus to:

obtain an energy value of the first detection frequency band by detecting a second signal that is received on the first detection frequency band;

detect that the first detection frequency band is idle when the energy value is less than or equal to a preset value; and

detect that the first detection frequency band is not idle when the energy value is greater than the preset value.

19. A non-transitory computer-readable storage medium comprising instructions that, when executed by one or more processors, cause an apparatus to:

obtain a preset transmit frequency band comprising a first transmit frequency bandwidth, wherein the preset transmit frequency band comprises N sub-frequency bands, and wherein a first sum of bandwidths of the N sub-frequency bands is equal to the first transmit frequency bandwidth;

select, based on the preset transmit frequency band, an operating bandwidth of the apparatus, wherein the operating bandwidth is occupied by a waveform of a signal transmitted by the apparatus, wherein the operating bandwidth is greater than a second sum of bandwidths of N−1 of the N sub-frequency bands and is less than the first sum of bandwidths of the N sub-frequency bands, and wherein the operating bandwidth comprises a total bandwidth of the N−1 of the N sub-frequency bands and a portion of a bandwidth of one of the N sub-frequency bands; and

transmit, on the operating bandwidth, a first signal.

20. The non-transitory computer-readable storage medium of claim 19 , wherein a frequency domain range of the preset transmit frequency band is predefined.

21. The non-transitory computer-readable storage medium of claim 19 , wherein distribution of the N sub-frequency bands in the preset transmit frequency band satisfies a predefined or pre-configured rule.