Abstract: The disclosure provides a method and a device for re-establishing a radio link. The method comprises: a destination NodeB receives a re-establishment request message sent by UE, the re-establishment request message carrying a cause value, and the cause value comprising information used for indicating UE handover success or handover failure; and the destination NodeB determines, according to the cause value, a security algorithm applied radio link re-establishment between the destination NodeB and the UE, and establishes a radio link using the security algorithm. The disclosure solves the technical problem in the traditional art that the radio link re-establishment fails as a security algorithm fallback process fails, thereby achieving the technical effect of improving the success rate of radio link re-establishment.

Abstract: The disclosure provides a method and an apparatus for re-establishing a radio link. The method comprises: a destination base station receiving a re-establishment request message sent by a User Equipment (UE), a cell identifier and an identifier of the UE are carried in the re-establishment request message, and attribute information used for indicating UE handover success or handover failure is carried in the cell identifier and the identifier of the UE (S102); and the destination base station determining, according to the attribute information, a security algorithm applied to radio link re-establishment between the destination base station and the UE, and establishing a radio link using the security algorithm (S104). The disclosure solves the problem in the related art that the radio link re-establishment fails as a security algorithm fallback process fails, thereby improving the success rate of radio link re-establishment.

Abstract: The disclosure provides a method and an apparatus for re-establishing a radio link. The method comprises: a destination base station receiving a re-establishment request message sent by a User Equipment (UE), a cell identifier and an identifier of the UE are carried in the re-establishment request message, and attribute information used for indicating UE handover success or handover failure is carried in the cell identifier and the identifier of the UE (S102); and the destination base station determining, according to the attribute information, a security algorithm applied to radio link re-establishment between the destination base station and the UE, and establishing a radio link using the security algorithm (S104). The disclosure solves the problem in the related art that the radio link re-establishment fails as a security algorithm fallback process fails, thereby improving the success rate of radio link re-establishment.

Abstract: The disclosure provides a method and a device for re-establishing a radio link. The method comprises: a destination NodeB receives a re-establishment request message sent by UE, the re-establishment request message carrying a cause value, and the cause value comprising information used for indicating UE handover success or handover failure; and the destination NodeB determines, according to the cause value, a security algorithm applied radio link re-establishment between the destination NodeB and the UE, and establishes a radio link using the security algorithm. The disclosure solves the technical problem in the traditional art that the radio link re-establishment fails as a security algorithm fallback process fails, thereby achieving the technical effect of improving the success rate of radio link re-establishment.

Abstract: The invention provides a method and a system for determining an end time of uplink back propagation in a mobile communication system to solve a problem of accurately judging the end time of uplink back propagation, wherein the method includes the following steps: sending data with consecutive sequence numbers in a buffer of a packet data convergence protocol (PDCP) module to a serving gateway (S-GW) via an S1 tunnel; sending data with inconsecutive sequence numbers, which is from data with a first inconsecutive sequence number to last data in the buffer of the PDCP module, to a target base station via an uplink back propagation tunnel; generating an end marker datagram; sending the end marker datagram to the target base station via the uplink back propagation tunnel; and receiving, by the target base station, the end marker datagram and determining that the uplink back propagation has ended.

Abstract: The invention provides a method and a system for determining an end time of uplink back propagation in a mobile communication system to solve a problem of accurately judging the end time of uplink back propagation, wherein the method includes the following steps: sending data with consecutive sequence numbers in a buffer of a packet data convergence protocol (PDCP) module to a serving gateway (S-GW) via an S1 tunnel; sending data with inconsecutive sequence numbers, which is from data with a first inconsecutive sequence number to last data in the buffer of the PDCP module, to a target base station via an uplink back propagation tunnel; generating an end marker datagram; sending the end marker datagram to the target base station via the uplink back propagation tunnel; and receiving, by the target base station, the end marker datagram and determining that the uplink back propagation has ended.

Abstract: The present disclosure discloses a method, apparatus and system for implementing an X2 handover. In the scheme of the present disclosure, a Base Station (BS) initiates, after having determined the need for a handover and detected that there exists an X2 connection between the BS and a target BS and that the BS and the target BS are within the management scope of a same MME, an X2 handover, if it is determined that there exists a connection between the target BS and the serving gateway connected with the BS according to acquired serving gateways connected with an other BS. Here, the term “an/the other BS” refers to one different from the BS determines the need for a handover, and includes the target BS designated for a handover.