Method and device for notifying handover failure indication information
The invention discloses a method for notifying handover failure indication information, comprising: a first base station determines, according to radio link failure (RLF) information in a received radio resource control (RRC) re-establishment request message, the information about a cell in which an RLF happens before a UE initiates an RRC re-establishment, and sends the RLF information to a second base station to which the cell where the RLF happens belongs; and the second base station notifies, according to a notification condition set for the indication information of a too early handover or a handover selecting a wrong target handover cell, the base station initiating a handover of the indication information of a too early handover or a handover selecting a wrong target handover cell, both of which meet the notification condition; or upon determining the handover of the UE to a cell in which an RLF happens is a too early handover or a handover selecting a wrong target handover cell, the second base station notifies the base station initiating the handover of the indication information of the too early handover or the handover selecting a wrong target handover cell. The present invention also discloses a device for realizing the method. The invention increases the success rate of a cell handover.
1. A method for feeding back RLF-inducing handover information, comprising:
switching, by a source base station, a user equipment (LIE) from a source cell to a target cell; upon occurrence of a radio link failure (RLF) in the target cell, receiving, by the source base station, from the LIE a radio resource control (RRC) re-establishment request message to re\-establish RRC in the source cell managed by the source base station;
determining, by the source base station, according to RLF information in the RRC re\-establishment request message, information about the target cell in which the RLF has occurred; and
sending, by the source base station, the RLF information to the target base station managing the target cell; and
upon determining that the handover of the LIE to the target cell is premature, feeding, by the target base station, back to the source base station initiating the handover information indicating that the handover is premature,
wherein the target base station determines that the handover of the LIE to the target cell is premature by determining that time elapsed since the completion of the handover till the occurrence of the RLF is less than a set threshold, a premature handover being defined as one after which an RLF occurs in the target cell within the set threshold and the LIE selects to return to the source cell for RRC re-establishment, and
wherein the RLF information comprises information on an ID of the source cell and wherein the target base station searches for the cause for a last handover of the LIE.
2. The method according to claim 1 , further comprising: when the target base station feeds information indicating that the handover is premature back to the source base station initiating the handover, notifying, by the target base station, the source base station initiating the handover of a cause of the handover of the LIE.
3. The method according to claim 1 , upon determining that the handover of the LIE to the target cell is premature, feeding, by the target base station, back to the source base station initiating the handover information indicating that the handover is premature, comprising:
feeding, by the target base station, back to the source base station initiating the handover information indicating that the handover is premature when the handover meets a set condition for feeding back information indicating a premature handover.
4. A method for feeding back RLF-inducing handover information, comprising:
switching, by a source base station, a user equipment (UE) from a source cell over to a target cell;
upon occurrence of a radio link failure (RLF) in the target cell, receiving, by a first base station, from the UE a radio resource control (RRC) re-establishment request message to re\-establish RRC in a first cell managed by the first base station;
determining, by the first base station, according to RLF information in the RRC re-establishment request message, information about the target cell in which the RLF has occurred;
sending, by the first base station, the RLF information to a target base station managing the target cell; and
upon determining that a handover of the UE to the target cell is the handover selecting a wrong target handover cell, feeding, by the target base station, information indicating that the handover is the handover selecting the wrong target handover cell back to the source base station initiating the handover,
wherein the target base station determines that the handover of the UE to the target cell is the handover selecting the wrong target handover cell by determining that time elapsed since the completion of the handover till the occurrence of the RLF is less than a set threshold, a-the handover selecting the wrong target handover cell being defined as one after which an RLF occurs in the target cell within the set threshold and the UE selects a cell other than the source cell or the target cell for RRC re-establishment, wherein the RLF information comprises information on an ID of the first cell and wherein the target base station searches for the cause for a last handover of the UE.
5. The method according to claim 4 , further comprising: when the target base station feeds information indicating that the handover is a-the handover selecting the wrong target handover cell back to the source base station initiating the handover, notifying, by the target base station, the source base station initiating the handover of a cause of the handover of the UE.
6. The method according to claim 4 , the upon determining that the handover of the UE to the target cell is a-the handover selecting the wrong target handover cell, feeding, by the target base station, back to the source base station initiating the handover information indicating that the handover is rhea handover selecting the wrong target handover cell, comprising:
feeding, by the target base station, information indicating that the handover is rhea handover selecting the wrong target handover cell back to the source base station initiating the handover when the handover meets a set condition for feeding back information indicating the handover selecting the wrong target handover cell.