Apparatus, method and computer program providing fast, zero data loss high speed data packet access (HSDPA) serving cell change

摘要

To handover a mobile terminal from a serving base station BTS to a target BTS, a radio network controller RNC: 1) informs the mobile terminal of the pending handover so it can preconfigure to communicate with the target BTS; 2) indicates to the serving BTS which will be the last data packet prior to handover; and 3) informs the target BTS of the pending handover and the mobile terminal's identity. The serving BTS indicates which is the last data packet and sends it to the mobile terminal. Upon receiving an acknowledgement, the serving BTS informs the RNC. The BTS automatically switches to the target BTS after receiving the last data packet from the serving BTS, informs the target BTS that it is ready to receive data from it by a handover confirmation message, and the target 1) schedules the mobile terminal to receive data; and 2) informs the RNC that the mobile terminal is handed over.