Handover method, base station, and terminal device

1. A handover method, comprising:

sending, by a source base station, a handover request to a target base station, the handover request comprising a service type of a terminal device and a quality of service (QoS) information of the terminal device, the service type of the terminal device corresponding to a network slice, the service type comprising an ultra-low latency service, ultra-reliable service, or massive connectivity service;

performing, by the target base station, an admission control in response to receiving the handover request, the admission control being performed based on the service type of the terminal and at least one service type supported by the target base station, the at least one service type supported by the target base station including the service type of the terminal;

sending, by the target base station, a handover response to the source base station, the handover response comprising information for performing a handover, the handover response comprising information of a cell-radio network temporary identifier of the terminal device in the target base station; and

sending, by the target base station, a path switch request message to a gateway.

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

sending, by the target base station, the at least one service type supported by the target base station to the source base station.

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

receiving, by the target base station, a path switch request acknowledgement from the gateway.

4. The handover method according to claim 1 , wherein the handover response further comprises a security algorithm of the target base station.

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

sending, by the target base station, UE context release information to the source base station.

6. A base station, comprising:

a transceiver;

a memory storing instructions; and

a processor coupled to the memory and the transceiver, the processor executing the instructions to perform:

receiving, using the transceiver, a handover request from a source base station, the handover request comprising a service type of a terminal device and quality of service (QoS) information of the terminal device, the service type of the terminal device corresponding to a network slice, the service type comprising an ultra-low latency service, ultra-reliable service, or massive connectivity service;

performing an admission control in response to receiving the handover request, the admission control being performed based on the service type of the terminal and at least one service type supported by the target base station, the at least one service type supported by the target base station includes the service type of the terminal;

instructing the transceiver to send a handover response to the source base station, the handover response comprising information for performing a handover, the handover response comprising information about a cell-radio network temporary identifier of the terminal device in the base station; and

instructing the transceiver to send a path switch request message to a gateway.

7. The base station according to claim 6 , wherein the processor is further configured to perform:

instructing the transceiver to send the at least one service type supported by the base station to the source base station.

8. The base station according to claim 6 , wherein the processor is further configured to perform:

instructing the transceiver to receive a path switch request acknowledgement from the gateway.

9. The base station according to claim 6 , wherein the handover response further comprises a security algorithm of the target base station.

10. The base station according to claim 6 , wherein the processor is further configured to perform:

instructing the transceiver to send UE context release information to the source base station.

11. A communication system, comprising:

a source base station; and

a target base station;

the source base station is configured to:

send a handover request to the target base station, the handover request comprising information about a service a service type of a terminal device and quality of service (QoS) information of the terminal device, the service type of the terminal device corresponding to a network slice, the service type comprising an ultra-low latency service, ultra-reliable service, or massive connectivity service; and

the target base station is configured to:

perform an admission control in response to receiving the handover request, the admission control being performed based on the information about the service type of the terminal and at least one service type supported by the target base station, the at least one service type supported by the target base station including the service type of the terminal; and

send a handover response to the source base station, the handover response comprising information for performing a handover, the handover response comprising information of a cell-radio network temporary identifier of the terminal device in the target base station; and

send a path switch request message to a gateway.

12. The system according to claim 11 , wherein:

the target base station is configured to send the at least one service type supported by the target base station to the source base station.

13. The system according to claim 11 , wherein:

the gateway is configured to send a path switch request acknowledgement to the target base station.

14. The system according to claim 11 , wherein the handover response further comprises a security algorithm of the target base station.

15. The system according to claim 11 , wherein the target base station is configured to send UE context release information to the source base station.