Multi-connectivity communication method and device

1. A multi-connectivity communication method, comprising:

determining, by an access network device of a Long Term Evolution (LTE) network, an access network device group for user equipment (UE), wherein the access network device group comprises at least two access network devices of a next generation network, and there is a first connection between the access network device of the LTE network and the UE;

setting up, by the access network device of the LTE network, a second connection for the UE, wherein the second connection is a connection set up between the UE and the access network device of the LTE network through a first access network device in the access network device group, and wherein the setting up comprises:

separately sending, by the access network device of the LTE network, a dual connectivity adding request to each access network device in the access network device group, wherein the dual connectivity adding request requests to add the second connection for the UE;

separately receiving, by the access network device of the LTE network, a dual connectivity adding response from each access network device of the next generation network, wherein the dual connectivity adding response from each access network device of the next generation network comprises configuration information of the respective access network device of the next generation network;

sending, by the access network device of the LTE network, the configuration information of each access network device of the next generation network to the UE;

receiving, by the access network device of the LTE network, a configuration complete message from the UE; and

determining, based on the configuration complete message, that the second connection is successfully set up; and

splitting, by the access network device of the LTE network, data of the UE through the second connection.

2. The method according to claim 1 , wherein after the setting up, by the access network device of the LTE network, the second connection for the UE, the method further comprises:

receiving, by the access network device of the LTE network, a connection hang-up indication from the UE, wherein the connection hang-up indication instructs the access network device of the LTE network to stop sending downlink data to the first access network device; and

receiving, by the access network device of the LTE network, a connection change indication from the UE, wherein the connection change indication instructs the access network device of the LTE network to switch the second connection from the first access network device to a second access network device in the access network device group.

3. The method according to claim 1 , wherein the dual connectivity adding request from the access network device of the LTE network to each access network device of the next generation network comprises the configuration information of the access network device of the next generation network; and

before the separately sending, by the access network device of the LTE network, the dual connectivity adding request to each access network device in the access network device group, the method further comprises:

generating, by the access network device of the LTE network, the configuration information for each access network device of the next generation network.

4. The method according to claim 1 , wherein the dual connectivity adding request from the access network device of the LTE network to each access network device of the next generation network comprises: configuration information of the access network device of the LTE network and a measurement report of each access network device of the next generation network, wherein the configuration information of the access network device of the next generation network is generated by a Radio Resource Control (RRC) layer of the access network device of the next generation network based on the configuration information of the access network device of the LTE network and the measurement report of the access network device of the next generation network.

5. The method according to claim 1 , wherein determining, by the access network device of the LTE network, the access network device group for UE comprises:

receiving, by the access network device of the LTE network, a candidate access network device group from the UE, wherein the candidate access network device group comprises at least two candidate access network devices of the next generation network that are determined by the UE; and

determining, by the access network device of the LTE network, the access network device group based on the candidate access network device group.

6. An access network device of a Long Term Evolution (LTE) network, comprising a processor and a memory, wherein the memory is configured to store a program, and the processor is configured to run the program to perform the following steps:

determining an access network device group for user equipment (UE), wherein the access network device group comprises at least two access network devices of a next generation network, and there is a first connection between the access network device of the LTE network and the UE;

setting up a second connection for the UE, wherein the second connection is a connection set up between the UE and the access network device of the LTE network through a first access network device in the access network device group, and wherein the setting up comprises:

separately sending a dual connectivity adding request to each access network device in the access network device group, wherein the dual connectivity adding request requests to add the second connection for the UE;

separately receiving a dual connectivity adding response from each access network device of the next generation network, wherein the dual connectivity adding response from each access network device of the next generation network comprises configuration information of the respective access network device of the next generation network;

sending the configuration information of each access network device of the next generation network to the UE;

receiving a configuration complete message from the UE; and

determining, based on the configuration complete message, that the second connection is successfully set up; and

splitting data of the UE through the second connection.

7. The device according to claim 6 , wherein the processor is configured to run the program to further perform the following steps:

receiving a connection hang-up indication from the UE, wherein the connection hang-up indication instructs the access network device of the LTE network to stop sending downlink data to the first access network device; and

receiving a connection change indication from the UE, wherein the connection change indication instructs the access network device of the LTE network to switch the second connection from the first access network device to a second access network device in the access network device group.

8. The device according to claim 6 , wherein the dual connectivity adding request to each access network device of the next generation network comprises the configuration information of the access network device of the next generation network; and

the processor is further configured to generate the configuration information for each access network device of the next generation network.

9. The device according to claim 6 , wherein the dual connectivity adding request to each access network device of the next generation network comprises: configuration information of the access network device of the LTE network and a measurement report of each access network device of the next generation network, wherein the configuration information of the access network device of the next generation network is generated by a Radio Resource Control (RRC) layer of the access network device of the next generation network based on the configuration information of the access network device of the LTE network and the measurement report of the access network device of the next generation network.

10. The device according to claim 6 , wherein the processor is configured to run the program to further perform the following steps:

receiving a candidate access network device group from the UE, wherein the candidate access network device group comprises at least two candidate access network devices of the next generation network that are determined by the UE; and

determining the access network device group based on the candidate access network device group.

11. User equipment (UE), comprising:

a receiver, configured to receive configuration information that is of access network devices in an access network device group and that is from an access network device of a Long Term Evolution (LTE) network, wherein the access network device group comprises at least two access network devices of a next generation network;

a processor, configured to access a first access network device in the access network device group based on configuration information of the first access network device in the access network device group;

a transmitter, configured to send a configuration complete message to the access network device of the LTE network, wherein the configuration complete message notifies the access network device of the LTE network that a second connection is successfully set up, and the second connection is a connection set up between the UE and the access network device of the LTE network through the first access network device; and wherein

the processor is further configured to determine to switch the second connection from the first access network device to a second access network device in the access network device group;

the transmitter is further configured to send a connection hang-up indication to the access network device of the LTE network, and the connection hang-up indication instructs the access network device of the LTE network to stop sending downlink data to the first access network device;

the processor is further configured to access the second access network device based on configuration information of the second access network device; and

the transmitter is further configured to send a connection change indication to the access network device of the LTE network, wherein the connection change indication instructs the access network device of the LTE network to switch the second connection from the first access network device to the second access network device.

12. The UE according to claim 11 , wherein the transmitter is further configured to send a candidate access network device group to the access network device of the LTE network, wherein the candidate access network device group comprises at least two candidate access network devices of the next generation network that are determined by the UE.

13. The UE according to claim 11 , wherein the transmitter is configured to send the configuration complete message to the access network device of the LTE network through the first access network device, and the configuration complete message comprises an identifier of the access network device of the LTE network and an identifier of the UE in the next generation network.

14. The UE according to claim 11 , wherein the transmitter is configured to send the configuration complete message to the access network device of the LTE network directly, and the configuration complete message carries an identifier of the first access network device and an identifier of the UE in the next generation network.