Method, communications device, and network device for monitoring physical downlink control channel, communications device, and network device using wake-up signal (WUS)

1. A method, comprising:

detecting, by a communications device, a wake-up signal; and

monitoring, by the communications device based on the wake-up signal and a bandwidth part (BWP), a physical downlink control channel, wherein the BWP corresponds to the wake-up signal, and wherein the physical downlink control channel is a physical downlink control channel of the BWP, and

wherein the wake-up signal corresponds to a component carrier, and wherein the BWP is an active BWP of the component carrier.

2. The method according to claim 1 , wherein a bit group corresponds to the wake-up signal and the BWP; and

wherein the monitoring comprises:

generating, by the communications device, the bit group corresponding to the wake-up signal and the BWP; and

monitoring, by the communications device based on the bit group, the wake-up signal, and the BWP, the physical downlink control channel.

3. The method according to claim 2 , wherein the bit group corresponds to the component carrier.

4. The method according to claim 1 , further comprising:

switching, by the communications device, to an initial BWP or a default BWP of the component carrier in response to the communications device switching from monitoring a physical downlink control channel of a first BWP of the component carrier to sleeping.

5. The method according to claim 1 , further comprising:

waking up, by the communications device, to monitor a physical downlink control channel of an active BWP in a first component carrier in response to the communications device not monitoring the physical downlink control channel of the active BWP in the first component carrier for a duration exceeding a preset threshold.

6. The method of claim 1 , wherein the component carrier is determined based on the wake-up signal.

7. A method comprising:

determining, by a network device, a wake-up signal; and

sending, by the network device, the wake-up signal to a communications device, wherein the wake-up signal indicates to the communications device to monitor, based on the wake-up signal and a bandwidth part (BWP), a physical downlink control channel, wherein the BWP corresponds to the wake-up signal, and wherein the physical downlink control channel is a physical downlink control channel of the BWP, and

wherein the wake-up signal corresponds to a component carrier, and wherein the BWP is an active BWP of the component carrier.

8. The method according to claim 7 , wherein a bit group corresponds to the wake-up signal and the BWP.

9. The method according to claim 8 , wherein the bit group corresponds to the component carrier.

10. The method according to claim 7 , further comprising:

sending a second wake-up signal corresponding to a second component carrier.

11. A device, comprising:

at least one processor; and

a non-transitory computer readable memory storing a program to be executed by the at least one processor, the program including instructions to cause the device to perform operations including:

detecting a wake-up signal; and

monitoring, based on the wake-up signal and a bandwidth part (BWP), a physical downlink control channel, wherein the BWP corresponds to the wake-up signal, and wherein the physical downlink control channel is a physical downlink control channel of the BWP, and

wherein the wake-up signal corresponds to a component carrier, and wherein the BWP is an active BWP of the component carrier.

12. The device according to claim 11 , wherein a bit group corresponds to the wake-up signal and the BWP,

wherein the monitoring comprises:

generating the bit group corresponding to the wake-up signal and the BWP; and

monitoring, based on the bit group, the wake-up signal, and the BWP, the physical downlink control channel.

13. The device according to claim 12 , wherein the bit group corresponds to the component carrier.

14. The device according to claim 13 , the operations further including:

switching to an initial BWP or a default BWP of the component carrier in response to the device switching from monitoring a physical downlink control channel of a first BWP of the component carrier to sleeping.

15. The device according to claim 11 , the operations further including:

waking up to monitor a physical downlink control channel of an active BWP in a first component carrier in response to the device not monitoring the physical downlink control channel of the active BWP in the first component carrier for duration exceeding a preset threshold.