A method of cell handover

Abstract

The present invention discloses a cell handover method, comprising: a source base station reserves a dedicated random access resource for a user equipment, and configures the reserved dedicated random access resource to the user equipment; after the user equipment switches to a target base station, The target base station does not request the core network to switch the downlink GTP tunnel within the preset waiting time; when the user equipment needs to switch back to the source base station, the user equipment uses the saved dedicated random access preamble to initiate random access and synchronizes with the source base station , switching back to the source base station; after the user equipment is switched back to the source base station, the source base station cancels the reserved dedicated random access resource, performs admission control, and configures the allocated radio resource information to the user equipment. By using the cell switching method provided by the present invention, the switching delay can be reduced, the risk of UE call drop during the switching process can be reduced, and the signaling processing overhead of the base station and the core network can also be reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a cell switching method. Background technique [0002] In order to ensure the service continuity of the user equipment (UE) in the radio resource control (RRC) connected state RRC_CONNECTED, the long-term evolution (LTE) system adopts a network-controlled user equipment-assisted manner to perform cell handover. The whole handover process includes three stages: handover preparation, handover execution, and handover completion. The specific switching process is as follows: [0003] In the handover preparation phase, the source base station (for example, the base station in the LTE system is an evolved Node B) makes a handover decision, and selects a handover candidate cell; the source base station interacts with the target base station to which the handover candidate cell belongs to, and obtains the UE prepared by the target base station. Switch resources. ...

AI Technical Summary

Problems solved by technology

When the UE is handed over from the macro base station to the micro base station, in the existing handover method, after the UE reports the measurement report, it needs to go through two stages of handover preparation and handover execution to establish an air interface connection with the target cell. The risk of dropped calls; in addition, when the UE switches from a macro base station to a micro base station and then switches back to the macro base station in a short period of time, the traditional handover process requires two downlink GTP tunnel conversions, which increases the signaling between the base station and the core network processing overhead

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