Patent ID: 7978634
Filing Date: 2011-07-12
Classification: H04W,Y02D

Abstract:
1. A cell handoff method based on a TDD system, comprising: step A. measuring, by a UE, received pilot channels of a source cell and a neighboring cell according to a measurement control message and reporting measurement result to a RNC; step B. determining, by the RNC, whether to perform the cell handoff process according to the reported measurement result and if yes, entering step C, otherwise maintaining former radio link; Step C. when the RNC determines according to the reported measurement result that a cell handoff process is to be performed, determining, by the RNC, whether a target cell to be subject to a cell handoff process has available resources at a time slot different from that of the source cell and if yes, transmitting a cell handoff command to the UE, allocating available resources for the UE in the target cell and transmitting traffic carrier data of the UE to the source cell and the target cell respectively; Step D. after receiving the cell handoff command, communicating, by the UE, with the source cell and the target cell at a same frame and at same time according to the allocated available resources; and step E. when the UE performs a reliable communication at the uplink and downlink of the target cell, reporting, by the UE, a handoff successful message to the RNC from the target cell, and continuing, by the RNC, to determine on the reported measurement result and controlling the UE to delete a communication link with the source cell.