Communication method and communications apparatus

1. A method, comprising:

receiving, by a terminal device, control information sent by a first network device, wherein the control information is new radio (NR) frequency information of a second network device or NR cell information of the second network device, the NR frequency information indicates an NR frequency that is usable by the second network device to provide a service with the first network device in a long term evolution-new radio dual connectivity (LTE-NR DC) mode, the NR cell information indicates an NR cell that is usable by the second network device to provide a service with the first network device in the LTE-NR DC mode, the second network device and the first network device use different radio access technologies, the terminal device camps on a cell of the first network device when the control information is received, and a cell of the second network device does not support camping of the terminal device or does not support initial access of the terminal device;

determining, by the terminal device, whether the NR frequency or the NR cell is accessible by the terminal device;

determining, by the terminal device, whether a capability of the terminal device supports operating in the LTE-NR DC mode with the NR frequency or the NR cell; and

displaying, by the terminal device, a first sign based on determining whether the NR frequency or the NR cell is accessible by the terminal device and determining whether the capability of the terminal device supports operating in the LTE-NR DC mode with the NR frequency or the NR cell, wherein the first sign corresponds to a radio access technology used by the second network device.

2. The method according to claim 1 , wherein determining, by the terminal device, whether the NR frequency or the NR cell is accessible by the terminal device comprises:

performing, by the terminal device, signal measurement on the NR frequency or the NR cell based on the NR frequency information or the NR cell information; and

determining, by the terminal device, whether the NR frequency or the NR cell is accessible by the terminal device based on a measurement result of the signal measurement.

3. The method according to claim 2 , wherein determining, by the terminal device, whether the NR frequency or the NR cell is accessible by the terminal device further comprises:

determining, by the terminal device, that the NR frequency or the NR cell is accessible by the terminal device in response to the terminal device detecting a signal of the NR frequency or the NR cell; or

determining, by the terminal device, that the NR frequency or the NR cell is accessible by the terminal device in response to the terminal device detecting a signal of the NR frequency or the NR cell, and quality of the signal of the NR frequency or the NR cell being greater than a first threshold.

4. The method according to claim 1 , wherein displaying, by the terminal device, the first sign based on determining whether the NR frequency or the NR cell is accessible by the terminal device and determining whether the capability of the terminal device supports operating in the LTE-NR DC mode with the NR frequency or the NR cell comprises:

displaying, by the terminal device, the first sign in response to the terminal device detecting a signal of the NR frequency or the NR cell, and the capability of the terminal device supporting operating in the LTE-NR DC mode using the NR frequency or the NR cell; or

displaying, by the terminal device, the first sign in response to the terminal device detecting a signal of the NR frequency or the NR cell, quality of the signal of the NR frequency or the NR cell being greater than a first threshold, and the capability of the terminal device supporting operating in the LTE-NR DC mode using the NR frequency or the NR cell.

5. The method according to claim 1 , wherein the control information is carried in a radio resource control (RRC) connection reconfiguration message, and the RRC connection reconfiguration message instructs to set the NR cell as an NR secondary cell of the terminal device in the LTE-NR DC mode.

6. An apparatus, comprising:

a receiver, configured to receive control information sent by a first network device, wherein control information is new radio (NR) frequency information of a second network device or NR cell information of the second network device, the NR frequency information indicates an NR frequency that is usable by the second network device to provide a service with the first network device in a long term evolution-new radio dual connectivity (LTE-NR DC) mode, the NR cell information indicates an NR cell that is usable by the second network device to provide a service with the first network device in the LTE-NR DC mode, the second network device and the first network device are configured to use different radio access technologies, the apparatus is configured to be camping on a cell of the first network device when the control information is received, and a cell of the second network device does not support camping of the apparatus or does not support initial access of the apparatus;

determining whether the NR frequency or the NR cell is accessible by the apparatus;

determining whether a capability of the apparatus supports operating in the LTE-NR DC mode with the NR frequency or the NR cell; and

a display, configured to display a first sign based on determining whether the NR frequency or the NR cell is accessible by the apparatus and determining whether the capability of the apparatus supports operating in the LTE-NR DC mode with the NR frequency or the NR cell, wherein the first sign corresponds to a radio access technology used by the second network device.

7. The apparatus according to claim 6 , wherein determining whether the NR frequency or the NR cell is accessible by the apparatus comprises:

performing signal measurement on the NR frequency or the NR cell based on the NR frequency information or the NR cell information.

8. The apparatus according to claim 7 , wherein determining whether the NR frequency or the NR cell is accessible by the apparatus further comprises:

determining that the NR frequency or the NR cell is accessible by the apparatus in response to a signal of the NR frequency or the NR cell being detected; or

determining that the NR frequency or the NR cell is accessible by the apparatus in response to a signal of the NR frequency or the NR cell being detected and quality of the signal of the NR frequency or the NR cell being greater than a first threshold.

9. The apparatus according to claim 6 , wherein displaying the first sign based on determining whether the NR frequency or the NR cell is accessible by the apparatus and determining whether the capability of the apparatus supports operating in the LTE-NR DC mode with the NR frequency or the NR cell comprises:

displaying the first sign in response to a signal of the NR frequency or the NR cell being detected and the capability of the apparatus supporting operating in the LTE-NR DC mode using the NR frequency or the NR cell; or

displaying the first sign in response to a signal of the NR frequency or the NR cell being detected, quality of the signal of the NR frequency or the NR cell being greater than a first threshold, and the capability of the apparatus supporting operating in the LTE-NR DC mode using the NR frequency or the NR cell.

10. The apparatus according to claim 6 , wherein the control information is carried in a radio resource control (RRC) connection reconfiguration message, and the RRC connection reconfiguration message instructs to set the NR cell as an NR secondary cell of the apparatus in the LTE-NR DC mode.

11. An apparatus, comprising:

a processor, configured to:

determine control information, wherein the control information indicates control information is new radio (NR) frequency information of a second network device or NR cell information of the second network device, the NR frequency information indicates an NR frequency that is usable by the second network device to provide a service with the apparatus in a long term evolution-new radio dual connectivity (LTE-NR DC) mode, the NR cell information indicates an NR cell that is usable by the second network device to provide a service with the apparatus in the LTE-NR DC mode, the second network device and the apparatus are configured to use different radio access technologies, a terminal device camps on a cell of the apparatus when the control information is determined, and a cell of the second network device does not support camping of the terminal device or does not support initial access of the terminal device; and

a transmitter, configured to send the control information to the terminal device, causing the terminal device to determine whether the NR frequency or the NR cell is accessible by the terminal device, to determine whether a capability of the terminal device supports operating in the LTE-NR DC mode with the NR frequency or the NR cell, and to display a first sign based on determining whether the NR frequency or the NR cell is accessible by the terminal device and determining whether the capability of the terminal device supports operating in the LTE-NR DC mode with the NR frequency or the NR cell.

12. The apparatus according to claim 11 , wherein the control information is carried in a radio resource control (RRC) connection reconfiguration message, and the RRC connection reconfiguration message instructs to set the NR cell as an NR secondary cell of the terminal device in the LTE-NR DC mode.