Method and apparatus for establishing secondary connection

1. A method for establishing a secondary connection, comprising:

acquiring, by a primary access network device, secondary network access capability information of a terminal device, wherein the secondary network access capability information is used to indicate a capability for the terminal device to access a secondary access network device;

sending, by the primary access network device, a secondary connection addition request message to a first secondary access network device, wherein the secondary connection addition request message is used to request addition of the first secondary access network device as a network device for transmitting data, and the secondary connection addition request message comprises the secondary network access capability information; and

receiving, by the primary access network device, a confirmation message of the secondary connection addition request message sent by the first secondary access network device, wherein the confirmation message of the secondary connection addition request message comprises first configuration information, and the first configuration information is used to establish the secondary connection between the first secondary access network device and the terminal device;

wherein the secondary network access capability information is used to indicate a maximum capability for the terminal device to access the secondary access network device, the secondary connection addition request message further comprises second configuration information, wherein the second configuration information is configuration information of a secondary connection that has been established by the terminal device, the first configuration information is generated by the first secondary access network device according to the secondary network access capability information and the second configuration information, wherein a sum of configurations corresponding to the first configuration information and the second configuration information does not exceed the capability for the terminal device to access the secondary access network device indicated by the secondary network access capability information.

2. The method according to claim 1 , wherein the acquiring, by the primary access network device, the secondary network access capability information of the terminal device comprises:

receiving, by the primary access network device, a first message sent by the terminal device or a core network device, wherein the first message comprises the secondary network access capability information; and

acquiring, by the primary access network device, the secondary network access capability information from the first message.

3. The method according to claim 2 , wherein the receiving, by the primary access network device, the first message sent by the terminal device comprises:

receiving, by the primary access network device, the first message sent by the terminal device, wherein the first message is used to indicate that a configuration between the terminal device and the first secondary access network device is valid.

4. The method according to claim 1 , wherein before the sending, by the primary access network device, the secondary connection addition request message to the first secondary access network device, comprising:

receiving, by the primary access network device, measurement result information of at least one secondary access network device sent by the terminal device, wherein the measurement result information is used to indicate a link quality between a respective secondary access network device and the terminal device; and

determining, by the primary access network device, the first secondary access network device according to measurement result information of each of the at least one secondary access network device.

5. The method according to claim 1 , wherein the method further comprises:

sending, by the primary access network device, the first configuration information to the terminal device so that the terminal device establishes the secondary connection with the first secondary access network device according to the first configuration information.

6. The method according to claim 1 , wherein the primary access network device is a network device in a first communication system, and the secondary access network device is a network device in a second communication system.

7. The method according to claim 1 , wherein the secondary connection addition request message further comprises measurement result information of the first secondary access network device, wherein the measurement result information is used to indicate a link quality between the first secondary access network device and the terminal device.

8. A method for establishing a secondary connection, comprising:

receiving, by a first secondary access network device, a secondary connection addition request message sent by a primary access network device, wherein the secondary connection addition request message is used to request addition of the first secondary access network device as a network device for transmitting data, and the secondary connection addition request message comprises secondary network access capability information, wherein the secondary network access capability information is used to indicate a capability for a terminal device to access a secondary access network device;

generating, by the first secondary access network device, first configuration information according to the secondary network access capability information, wherein the first configuration information is used to establish the secondary connection between the first secondary access network device and the terminal device; and

sending, by the first secondary access network device, a confirmation message of the secondary connection addition request message to the primary access network device, wherein the confirmation message of the secondary connection addition request message comprises the first configuration information;

wherein the secondary network access capability information is used to indicate a maximum capability for the terminal device to access the secondary access network device, the secondary connection addition request message further comprises second configuration information which is configuration information of a secondary connection that has been established by the terminal device, and the generating, by the first secondary access network device, the first configuration information according to the secondary network access capability information comprises:

generating, by the first secondary access network device, the first configuration information according to the secondary network access capability information and the second configuration information, wherein a sum of configurations corresponding to the first configuration information and the second configuration information does not exceed the capability for the terminal device to access the secondary access network device indicated by the secondary network access capability information.

9. The method according to claim 8 , wherein the primary access network device is a network device in a first communication system, and the secondary access network device is a network device in a second communication system.

10. The method according to claim 8 , wherein the secondary connection addition request message further comprises measurement result information of the first secondary access network device, wherein the measurement result information is used to indicate a link quality between the first secondary access network device and the terminal device.

11. An apparatus for establishing a secondary connection, comprising:

a memory, a processor, and a computer program stored on the memory and operable on the processor,

wherein the processor, when running the computer program, is configured to:

send secondary network access capability information of the terminal device to a primary access network device, wherein the secondary network access capability information is used to indicate a capability for the terminal device to access a secondary access network device; and

receive first configuration information sent by the primary access network device, wherein the first configuration information is used to establish the secondary connection between a first secondary access network device and the terminal device, and is generated according to the secondary network access capability information and second configuration information, wherein the secondary network access capability information is used to indicate a maximum capability for the terminal device to access the secondary access network device, the second configuration information is comprised in a secondary connection addition request message sent by the primary access network device to the first secondary access network device, and is configuration information of a secondary connection that has been established by the terminal device, and a sum of configurations corresponding to the first configuration information and the second configuration information does not exceed the capability for the terminal device to access the secondary access network device indicated by the secondary network access capability information.

12. The apparatus according to claim 11 , wherein the processor is specifically configured to:

send a first message to the primary access network device, wherein the first message is used to indicate that a configuration between the terminal device and the first secondary access network device is valid, and the first message comprises the secondary network access capability information.

13. The apparatus according to claim 11 , wherein the processor is further configured to:

establish the secondary connection with the first secondary access network device according to the first configuration information.

14. The apparatus according to claim 11 , wherein the primary access network device is a network device in a first communication system, and the secondary access network device is a network device in a second communication system.

15. The apparatus according to claim 11 , wherein the processor is further configured to:

send measurement result information of at least one secondary access network device to the primary access network device, wherein the measurement result information is used to indicate a link quality between a respective secondary access network device and the terminal device.