Method and device for anchor replacement
View Patent ↗Disclosed is a method and device for anchor replacement. The method comprises: a target base station receives an anchor replacement request message transmitted by a source base station, wherein the source base station is a base station corresponding to a serving cell that currently provides a service for a terminal and has control decision making authority, the target base station is a base station corresponding to a secondary cell that is controlled by the serving cell and currently provides a service for the terminal, and the anchor replacement request message is used for requesting to handover the control decision making authority to the target base station; the target base station transmits an anchor replacement acknowledgement message to the source base station, wherein the anchor replacement acknowledgement message is used for acknowledging the anchor replacement request message. By means of the method for anchor replacement of the present invention, a terminal can continue transmitting user data while handover is being performed, and can obtain control signaling from a plurality of base stations, thereby ensuring smooth handover of the terminal, reducing handover latency, and improving the user experience during handover.
1. A handover method, comprising:
receiving, by a target base station, a handover request message sent by a source base station, wherein the source base station is a Master Node (MN) corresponding to a serving cell which currently provides service for a terminal and determines UE RRC (Radio Resource Control) state or terminates S1 interface, the target base station is a Second Node (SN) corresponding to Secondary Cell(s) which comprises PSCell and SCell and is controlled by the serving cell and currently provides service for the terminal, and the handover request message is configured to request to handover the RRC state decision control or S1 termination to the target base station; and
sending, by the target base station, a handover acknowledgement message to the source base station, wherein the handover acknowledgement message is to acknowledge the handover request message.
2. The method according to claim 1 , further comprising:
establishing, by the target base station, a RRC connection control with the terminal; and
sending, by the target base station, a release message to the terminal, wherein the release message is to indicate the terminal to release the source base station.
3. The method according to claim 2 , after sending, by the target base station, the handover acknowledgement message to the source base station, further comprising:
sending, by the target base station, an indication message to the terminal, the indication message comprising information indicating that RRC of the source base station is released and/or information indicating that RRC of the target base station is established.
4. The method according to claim 2 , after receiving, by the target base station, the handover request message sent by the source base station and before sending, by the target base station, the handover acknowledgement message to the source base station, further comprising:
receiving, by the target base station, an indication message sent by the source base station, the indication message comprising information indicating that RRC of the source base station is released and/or information indicating that RRC of the target base station is configured; and
forwarding, by the target base station, the indication message to the terminal.
5. The method according to claim 2 , after receiving, by the target base station, the handover request message sent by the source base station, further comprising:
sending, by the target base station, a path switching request to core network equipment according to the handover request message.
6. The method according to claim 1 , after sending, by the target base station, the handover acknowledgement message to the source base station, further comprising:
sending, by the target base station, an indication message to the terminal, the indication message comprising information indicating that RRC of the source base station is released and/or information indicating that RRC of the target base station is established.
7. The method according to claim 6 , wherein sending, by the target base station, the indication message to the terminal comprises:
sending, by the target base station, the indication message to the terminal through the source base station.
8. The method according to claim 1 , after receiving, by the target base station, the handover request message sent by the source base station and before sending, by the target base station, the handover acknowledgement message to the source base station, further comprising:
receiving, by the target base station, an indication message sent by the source base station, the indication message comprising information indicating that RRC of the source base station is released and/or information indicating that RRC of the target base station is established; and
forwarding, by the target base station, the indication message to the terminal.
9. The method according to claim 1 , after receiving, by the target base station, the handover request message sent by the source base station, further comprising:
sending, by the target base station, a path switching request to core network equipment according to the handover request message.
10. The method according to claim 1 , wherein the handover request message comprises at least one of following information comprising context information of the terminal, system information of the serving cell and radio resource configuration information for the terminal.
11. A handover method, comprising:
sending, by a source base station, a handover request message to a target base station, wherein the source base station is a Master Node (MN) corresponding to a serving cell which determines UE RRC (Radio Resource Control) state or terminates S1 interface, the target base station is a Second Node (SN) corresponding to Secondary Cell(s) which comprises PSCell and SCell and is controlled by the serving cell and currently provides service for the terminal, and the handover request message is configured to request to handover the RRC state decision control or S1 termination to the target base station; and
receiving, by the source base station, a handover acknowledgement message sent by the target base station, wherein the handover acknowledgement message is to acknowledge the handover request message.
12. The method according to claim 11 , after sending, by the source base station, the handover request message to the target base station and before receiving, by the source base station, the handover acknowledgement message sent by the target base station, further comprising:
sending, by the source base station, an indication message to the terminal, the indication message comprising information indicating that RRC of the source base station is released and/or information indicating that RRC of the target base station is established.
13. The method according to claim 12 , wherein sending, by the source base station, the indication message to the terminal comprises:
sending, by the source base station, the indication message to the terminal through the target base station.
14. The method according to claim 11 , after receiving, by the source base station, the handover acknowledgement message sent by the target base station, further comprising:
receiving, by the source base station, an indication message sent by the target base station, the indication message comprising information indicating that RRC of the source base station is released and/or information indicating that RRC of the target base station is established; and
forwarding, by the source base station, the indication message to the terminal.
15. The method according to claim 11 , before sending, by the source base station, the handover request message to the target base station, further comprising:
receiving, by the source base station, a signal strength measurement result reported by the terminal, the signal strength measurement result comprising strength of a signal which is currently received by the terminal from the cell of the source base station and strength of a signal which is currently received by the terminal from the cell of the target base station; and
when the source base station determines that the terminal needs to handover to the target base station according to the signal strength measurement result, adding, by the source base station, the target base station as the Secondary node comprising secondary cell(s) to enable the source base station and the target base station to simultaneously send user data to the terminal.
16. The method according to claim 11 , after receiving, by the source base station, the handover acknowledgement message sent by the target base station, further comprising:
sending, by the source base station, a path switching request to core network equipment according to the handover acknowledgement message.
17. The method according to claim 11 , wherein the handover request message comprises at least one of following information comprising context information of the terminal, system information of the serving cell and radio resource configuration information for the terminal.
18. A handover method, comprising:
receiving, by a terminal, an indication message sent by a source base station or a target base station, the indication message comprising information indicating that Radio Resource Control (RRC) of the source base station is released and/or information indicating that RRC of the target base station is established, wherein the source base station is a Master Node (MN) corresponding to a serving cell which currently provides service for the terminal and determines UE RRC state or terminates S1 interface, and the target base station is a Second Node (SN) corresponding to Secondary Cell(s) which comprises PSCell and SCell and is controlled by the serving cell and currently provides service for the terminal; and
establishing, by the terminal, an RRC connection control with the target base station.
19. The method according to claim 18 , further comprising:
receiving, by the terminal, a release message sent by the target base station, the release message indicating the terminal to release the source base station; and
releasing, by the terminal, the source base station according to the release message.
20. The method according to claim 18 , before receiving, by the terminal, the indication message sent by the source base station or the target base station, further comprising:
reporting, by the terminal, a signal strength measurement result to the source base station, the measurement result comprising strength of a signal which is currently received by the terminal from the cell of the source base station and strength of a signal which is currently received by the terminal from the cell of the target base station.