Patent ID: 8611304

Claim:
A method for forwarding data during cell handover in Long-Term Evolution (LTE), comprising: forwarding, by a source base station, data that has not completed transmission to a User Equipment (UE) to a target base station in a Packet Data Convergence Protocol (PDCP) layer during cell handover, comprising: forwarding user plane data of first PDCP data units that have not been transmitted to a Radio Link Control (RLC) layer of the source base station to the target base station in the PDCP layer; mapping RLC data units in the RLC layer that have not been transmitted to the UE and RLC data units in the RLC layer whose receipt acknowledge have not been received from the UE into second PDCP data units; forwarding user plane data of the second PDCP data units to the target base station in the PDCP layer during the cell handover; turning on Automatic Repeat Request function in the PDCP layer; and forwarding user plane data of third PDCP data units in the PDCP layer that have not been transmitted to the UE and user plane data of fourth PDCP data units in the PDCP layer whose receipt acknowledge have not been received from the UE to the target base station during the cell handover, and turning off the Automatic Repeat Request function after the cell handover completes; wherein the RLC data units in the RLC layer that have not been transmitted to the UE and the RLC data units in the RLC layer whose receipt acknowledge have not been received from the UE are RLC Protocol Data Units (PDUs).