Signal processing method, network equipment, system and computer storage medium

1. A signal processing method, applied to a sender network device and comprising:

generating a first reference signal based on a frequency-domain density of the first reference signal and an energy value of the first reference signal on a time-frequency resource;

determining a time-frequency resource location of a target channel, the target channel being configured to carry information of a Licensed Assisted Access (LAA) system; and

generating a Clear Channel Assessment (CCA) signal based on the time-frequency resource location of the target channel and the first reference signal, mapping the CCA signal to the target channel, and sending the CCA signal to a receiver network device through the target channel to enable the receiver network device to determine whether the target channel is applicable to the LAA system according to the CCA signal.

2. The method according to claim 1 , wherein generating the first reference signal based on the frequency-domain density of the first reference signal and the energy value of the first reference signal on the time-frequency resource comprises:

acquiring the frequency-domain density of the first reference signal;

determining energy information of the first reference signal based on the frequency-domain density of the first reference signal;

generating a frequency-domain signal of the first reference signal based on the energy information of the first reference signal; and

converting the frequency-domain signal of the first reference signal into a time-domain signal.

3. The method according to claim 2 , wherein generating the CCA signal based on the time-frequency resource location of the target channel and the first reference signal comprises:

determining a sending mode of the CCA signal based on the time-frequency resource location of the target channel, and generating the CCA signal based on the sending mode of the CCA signal and the time-domain signal of the first reference signal.

4. The method according to claim 3 , wherein determining the sending mode of the CCA signal based on the time-frequency resource location of the target channel comprises:

determining that the CCA signal is sent once for every preset number of subcarriers on a frequency domain; acquiring a sending moment of the CCA signal, and determining a first duration based on the sending moment of the CCA signal;

when the first duration is larger than or equal to a preset threshold value, determining the sending mode of the CCA signal as a first sending mode, the first sending mode referring to sending of the CCA signal only within the first duration; and

when the first duration is smaller than the preset threshold value, determining the sending mode of the CCA signal as a second sending mode, the second sending mode referring to sending of the CCA signal within the first duration, a next adjacent complete Orthogonal Frequency Division Multiplexing (OFDM) symbol on a time domain and a cyclic prefix length of the OFDM symbol.

5. The method according to claim 4 , wherein generating the CCA signal based on the sending mode of the CCA signal and the time-domain signal of the first reference signal comprises:

when the sending mode of the CCA signal is the first sending mode, setting a duration of the time-domain signal of the first reference signal to be the first duration to obtain the CCA signal; and

when the sending mode of the CCA signal is the second sending mode, setting the duration of the time-domain signal of the first reference signal to be equal to a sum of the first duration, a duration of a complete OFDM symbol and the cyclic prefix length of the OFDM symbol to obtain the CCA signal.

6. The method according to claim 2 , wherein generating the CCA signal based on the time-frequency resource location of the target channel and the first reference signal comprises:

determining that the CCA signal is sent once for every preset number of subcarriers on a frequency domain; acquiring the sending moment of the CCA signal, and determining the first duration through taking the sending moment of the CCA signal as a starting point on a time domain; and determining a sum of the first duration, a next adjacent complete OFDM symbol on the time domain and a cyclic prefix length of the OFDM symbol as a sending duration of the CCA signal, and obtaining the CCA signal through cycling the time-domain signal of the first reference signal based on the sending duration.

7. A sender network device, comprising:

a signal generation unit, configured to generate a first reference signal based on a frequency-domain density of the first reference signal and an energy value of the first reference signal on a time-frequency resource;

a setting unit, configured to determine a time-frequency resource location of a target channel, the target channel being configured to carry information of a Licensed Assisted Access (LAA) system, and generate a Clear Channel Assessment (CCA) signal based on the time-frequency resource location of the target channel and the first reference signal; and

a sending unit, configured to map the CCA signal to the target channel, and send the CCA signal to a receiver network device through the target channel to enable the receiver network device to determine whether the target channel is applicable to the LAA system according to the CCA signal.

8. The sender network device according to claim 7 , wherein the signal generation unit is configured to acquire the frequency-domain density of the first reference signal; determine energy information of the first reference signal based on the frequency-domain density of the first reference signal; generate a frequency-domain signal of the first reference signal based on the energy information of the first reference signal; and convert the frequency-domain signal of the first reference signal into a time-domain signal.

9. The sender network device according to claim 8 , wherein the setting unit is configured to determine a sending mode of the CCA signal based on the time-frequency resource location of the target channel, and generate the CCA signal based on the sending mode of the CCA signal and the time-domain signal of the first reference signal.

10. The sender network device according to claim 9 , wherein the setting unit is configured to determine that the CCA signal is sent once for every preset number of subcarriers on a frequency domain; acquire a sending moment of the CCA signal, and determine a first duration based on the sending moment of the CCA signal; when the first duration is larger than or equal to a preset threshold value, determine the sending mode of the CCA signal as a first sending mode, the first sending mode referring to sending of the CCA signal only within the first duration; and when the first duration is smaller than the preset threshold value, determine the sending mode of the CCA signal as a second sending mode, the second sending mode referring to sending of the CCA signal within the first duration, a next adjacent complete Orthogonal Frequency Division Multiplexing (OFDM) symbol on a time domain and a cyclic prefix length of the OFDM symbol.

11. The sender network device according to claim 10 , wherein the setting unit is configured to, when the sending mode of the CCA signal is the first sending mode, set a duration of the time-domain signal of the first reference signal to be the first duration to obtain the CCA signal; and when the sending mode of the CCA signal is the second sending mode, set the duration of the time-domain signal of the first reference signal to be equal to a sum of the first duration, a duration of a complete OFDM symbol and the cyclic prefix length of the OFDM symbol to obtain the CCA signal.

12. The sender network device according to claim 8 , wherein the setting unit is configured to determine that the CCA signal is sent once for every preset number of subcarriers on a frequency domain; acquire the sending moment of the CCA signal, and determine the first duration through taking the sending moment of the CCA signal as a starting point on a time domain; and determine a sum of the first duration, a next adjacent complete OFDM symbol on the time domain and a cyclic prefix length of the OFDM symbol as a sending duration of the CCA signal, and obtain the CCA signal thorough cycling the time-domain signal of the first reference signal based on the sending duration.

13. A non-transitory computer storage medium, in which a computer-executable instruction is stored, the computer-executable instruction being configured to execute a signal processing method, applied to a sender network device and comprising:

generating a first reference signal based on a frequency-domain density of the first reference signal and an energy value of the first reference signal on a time-frequency resource;

determining a time-frequency resource location of a target channel, the target channel being configured to carry information of a Licensed Assisted Access (LAA) system; and

generating a Clear Channel Assessment (CCA) signal based on the time-frequency resource location of the target channel and the first reference signal, mapping the CCA signal to the target channel, and sending the CCA signal to a receiver network device through the target channel to enable the receiver network device to determine whether the target channel is applicable to the LAA system according to the CCA signal.