Method and device for handover

Abstract

This application discloses a method for a handover of a mobile station between a source base station and a target base station. The target base station receives a handover request message from the source base station. The handover request message includes quality of service (QoS) information of the mobile device, radio bearer identifier information of the source base station, and a first mapping relationship between a flow and a radio bearer of the source base station. The target base station sends a handover acknowledgement message to the source base station.

What is claimed is: 
     
         1 . A method for a handover of a mobile device between a source base station and a target base station, comprising:
 receiving, by the target base station, a handover request message from the source base station, wherein the handover request message comprises quality of service (QoS) information of a mobile device, radio bearer identifier information of the source base station, and a first mapping relationship between a flow and an radio bearer of the source base station;   transmitting, by the target base station, a handover acknowledgement message to the source base station.   
     
     
         2 . The method according to  claim 1 , wherein the QoS information comprises QoS class identifier (QCI), guaranteed bit rate (GBR), or maximum rate. 
     
     
         3 . The method according to  claim 1 , wherein the method comprises:
 receiving, by the target base station, a data packet of a flow from the source base station; and   transmitting, by the target base station, the received data packet of the flow to the mobile device by using a radio bearer established between the target base station and the mobile device.   
     
     
         4 . The method according to  claim 3 , wherein the radio bearer between the target base station and the mobile device is different from a radio bearer between the source base station and the mobile device used for transmitting data packets of the flow from the source base station to the mobile device. 
     
     
         5 . The method according to  claim 4 , wherein the target base station has a second mapping relationship between a flow and a radio bearer, and the target base station establishes the radio bearer between the target base station and the mobile device based on the first mapping relationship and the second mapping relationship. 
     
     
         6 . The method according to  claim 3 , wherein the target base station transmits an end marker indicating an end of transmission of data packet received from the source base station. 
     
     
         7 . The method according to  claim 1 , wherein the target base station receives the handover request message via a direct interface between the target base station and the source base station. 
     
     
         8 . The method according to  claim 3 , further comprising:
 receiving, by the target base station, a data packet of the flow from a core network; and   transmitting, by the target base station, the data packet of the flow from the core network to the mobile device.   
     
     
         9 . A base station which acts as a target base station in a handover process, comprising:
 a receiver, configured to receive a handover request message from a source base station, wherein the handover request message comprises quality of service (QoS) information of a mobile device, radio bearer identifier information of the source base station and a first mapping relationship between a flow and an radio bearer of the source base station;   a transmitter, configured to send a handover acknowledgement message to the source base station.   
     
     
         10 . The base station according to  claim 9 , wherein QoS information comprises QoS class identifier (QCI), guaranteed bit rate (GBR), or maximum rate. 
     
     
         11 . The base station according to  claim 9 , wherein the receiver is configured to receive a data packet of the flow from the source base station, and the transmitter is configured to transmit the received data packet of the flow to the mobile device by using a radio bearer established between the target base station and the mobile device. 
     
     
         12 . The base station according to the  claim 11 , wherein the radio bearer between the target base station and the mobile device is different from a radio bearer between the source base station and the mobile device used for transmitting data packets of the flow from the source base station to the mobile device. 
     
     
         13 . The base station according to  claim 12 , wherein the target base station comprises a processor configured to establish the radio bearer between the target base station and the mobile device based on the first mapping relationship and a second mapping relationship between a flow and a radio bearer of the target base station. 
     
     
         14 . The base station according to  claim 11 , wherein the transmitter is configured to send an end marker indicating an end of transmission of data packet received from the source base station. 
     
     
         15 . The base station according to  claim 9 , wherein the receiver is configured to receive the handover request message via a direct interface between the target base station and the source base station. 
     
     
         16 . The base station according to  claim 9 , wherein the receiver is configured to receive a data packet of the flow from a core network, and the transmitter is configured to transmit the data packet of the flow from the core network to the mobile device. 
     
     
         17 . A computer-readable storage medium having a computer-readable program recorded thereon which, when executed by a processor in a base station which acts as a target base station in a handover process, cause the processor to implement operations comprising:
 receiving a handover request message from a source base station, wherein the handover request message comprises quality of service (QoS) information of a mobile device, radio bearer identifier information of the source base station, and a first mapping relationship between a flow and an radio bearer of the source base station; and   transmitting a handover acknowledgement message to the source base station.   
     
     
         18 . The computer-readable storage medium according to  claim 17 , wherein the operations comprise:
 receiving a data packet of a flow from the source base station; and   transmitting the received data packet of the flow to the mobile device by using a radio bearer established between the target base station and the mobile device.   
     
     
         19 . The computer-readable storage medium according to  claim 18 , wherein the radio bearer between the target base station and the mobile device is different from a radio bearer between the source base station and the mobile device used for transmitting data packets of the flow from the source base station to the mobile device. 
     
     
         20 . The computer-readable storage medium according to  claim 19 , wherein the processor establishes the radio bearer between the target base station and the mobile device based on the first mapping relationship and a second mapping relationship between a flow and a radio bearer of the target base station.