Frequency compensation method and apparatus

1. A method, comprising:

determining, by a terminal, a Doppler frequency shift value F d based on a weighted change rate of a change rate of a timing advance (TA) of the terminal; and

performing, by the terminal, frequency compensation for wireless communications based on the Doppler frequency shift value F d ; and

wherein the Doppler frequency shift value F d is determined using a formula: F d =Kd*Δt, wherein Kd represents a change rate of the Doppler frequency shift value F d ; and

the change rate Kd of the Doppler frequency shift value F d and the TA meet: Kd=α*(TA(t+2Δt)−TA(t+Δt))−β(TA(t+Δt)−TA(t)), wherein t represents a time, Δt represents a unit time, and α and β represent weighting coefficients.

2. The method according to claim 1 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

performing, by the terminal, frequency compensation on a downlink signal according to F=F0−F1, wherein

F represents a compensated frequency of the downlink signal, F0 represents a frequency of the downlink signal before compensation, F1 represents a frequency offset value, and F1 and F d meet: F1=F d , F1=F offset +F d , or F1=F offset +F d +F2, wherein

F offset represents a common component of a Doppler frequency shift value of the terminal in a cell, and F2 represents a frequency offset value determined based on a downlink reference signal.

3. The method according to claim 1 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

performing, by the terminal, frequency compensation on a to-be-sent uplink signal of the terminal according to F=F0−F1, wherein

F represents a compensated frequency of the to-be-sent uplink signal, F0 represents a frequency of the to-be-sent uplink signal before compensation, F1 represents a frequency offset value, and F1 and F d meet: F1=−F DL +2F d , F1=F offset +(−F DL +2F d ), or F1=F offset +(−F DL +2F d )+F3, wherein F DL represents a frequency offset value determined based on a received downlink signal, F offset represents a common component of a Doppler frequency shift value of the terminal in a cell, and F3 represents a frequency offset value that is determined by a network device based on an uplink reference signal and that is indicated by the network device.

4. The method according to claim 1 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

adjusting, by the terminal, a frequency of a crystal oscillator based on F1, and sending an uplink signal based on the adjusted frequency of the crystal oscillator, wherein

F1 and F d meet:

F 1=2 F d ;

F 1= F offset +2 F d ; or

F 1= F offset +2 F d +F 3, wherein

F offset represents a common component of a Doppler frequency shift value of the terminal in a cell, and F3 represents a frequency offset value that is determined by a network device based on an uplink reference signal and that is indicated by the network device.

5. An apparatus, comprising:

at least one processor and at least one non-transitory memory, wherein

the at least one non-transitory memory is configured to store program instructions; and

when executing the program instructions, the at least one process is caused to:

determine a Doppler frequency shift value Fa based on a weighted change rate of a change rate of a timing advance (TA) of a terminal; and

perform frequency compensation for wireless communications based on the Doppler frequency shift value F d ; and

wherein the Doppler frequency shift value Fa is determined using a formula: F d =Kd*Δt, wherein Kd represents a change rate of the Doppler frequency shift value F d ; and

the change rate Kd of the Doppler frequency shift value F d and the TA meet: Kd=α*(TA(t+2Δt)−TA(t+Δt))—β(TA(t+Δt)—TA(t)), wherein t represents a time, Δt represents a unit time, and α and β represent weighting coefficients.

6. The apparatus according to claim 5 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

performing frequency compensation on a downlink signal according to F=F0−F1, wherein

F represents a compensated frequency of the downlink signal, F0 represents a frequency of the downlink signal before compensation, F1 represents a frequency offset value, and F1 and F d meet: F1=F d , F1=F offset +F d , or F1=F offset +F d +F2, wherein

F offset represents a common component of a Doppler frequency shift value of the terminal in a cell, and F2 represents a frequency offset value determined based on a downlink reference signal.

7. The apparatus according to claim 5 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

performing frequency compensation on a to-be-sent uplink signal of the terminal according to F=F0−F1, wherein

F represents a compensated frequency of the to-be-sent uplink signal, F0 represents a frequency of the to-be-sent uplink signal before compensation, F1 represents a frequency offset value, and F1 and F d meet: F1=−F DL +2F d , F1=F offset +(−F DL +2F d ), or F1=F offset +(−F DL +2F d )+F3, wherein F DL represents a frequency offset value determined based on a received downlink signal, F offset represents a common component of a Doppler frequency shift value of the terminal in a cell, and F3 represents a frequency offset value that is determined by a network device based on an uplink reference signal and that is indicated by the network device.

8. The apparatus according to claim 5 , wherein performing the frequency compensation based on the Doppler frequency shift value F d , comprises:

adjusting a frequency of a crystal oscillator based on F1; and

sending an uplink signal based on the frequency of the crystal oscillator adjusted, wherein

F1 and F d meet:

F 1=2 F d ;

F 1= F offset +2 F d ; or

F 1= F offset +2 F d +F 3, wherein

F offset represents a common component of a Doppler frequency shift value of the terminal in a cell, and F3 represents a frequency offset value that is determined by a network device based on an uplink reference signal and that is indicated by the network device.

9. The apparatus according to claim 5 , wherein the apparatus is a chip or an integrated circuit of the terminal.

10. A non-transitory computer-readable storage medium storing computer-readable instructions, wherein when the computer-readable instructions are run on a communications apparatus, the communications apparatus is caused to:

determine a Doppler frequency shift value Fa based on a weighted change rate of a change rate of a timing advance (TA) of communications apparatus; and

perform frequency compensation for wireless communications of the communications apparatus based on the Doppler frequency shift value F d ; and

wherein the Doppler frequency shift value Fa is determined using a formula: F d =Kd*Δt, wherein Kd represents a change rate of the Doppler frequency shift value F d ; and

the change rate Kd of the Doppler frequency shift value Fa and the TA meet: Kd=α*(TA(t+2Δt)−TA(t+Δt))−β(TA(t+Δt)−TA(t)), wherein t represents a time, Δt represents a unit time, and α and β represent weighting coefficient.

11. The computer-readable storage medium according to claim 10 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

performing frequency compensation on a downlink signal according to F=F0−F1, wherein

F represents a compensated frequency of the downlink signal, F0 represents a frequency of the downlink signal before compensation, F1 represents a frequency offset value, and F1 and F d meet: F1=F d , F1=F offset +F d , or F1=F offset +F d +F2, wherein

F offset represents a common component of a Doppler frequency shift value of the communications apparatus in a cell, and F2 represents a frequency offset value determined based on a downlink reference signal.

12. The computer-readable storage medium according to claim 10 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

performing frequency compensation on a to-be-sent uplink signal of the communications apparatus according to F=F0−F1, wherein

F represents a compensated frequency of the to-be-sent uplink signal, F0 represents a frequency of the to-be-sent uplink signal before compensation, F1 represents a frequency offset value, and F1 and F d meet: F1=−F DL +2F d , F1=F offset +(−F DL +2F d ), or F1=F offset +(−F DL +2F d )+F3, wherein F DL represents a frequency offset value determined based on a received downlink signal, F offset represents a common component of a Doppler frequency shift value of the communications apparatus in a cell, and F3 represents a frequency offset value that is determined by a network device based on an uplink reference signal and that is indicated by the network device.

13. The computer-readable storage medium according to claim 10 , wherein performing the frequency compensation based on the Doppler frequency shift value F d comprises:

adjusting a frequency of a crystal oscillator based on F1; and

sending an uplink signal based on the frequency of the crystal oscillator adjusted, wherein

F1 and F d meet:

F 1=2 F d ;

F 1= F offset +2 F d ; or

F 1= F offset +2 F d +F 3, wherein

F offset represents a common component of a Doppler frequency shift value of the communications apparatus in a cell, and F3 represents a frequency offset value that is determined by a network device based on an uplink reference signal and that is indicated by the network device.