Subscriber station, network control means and method for triggering inter-frequency measurements in a mobile communication system

摘要

A quality measurement means (QMM) provided in a network control means (RNC) of a communication system (T1) monitors the transmission quality on the down link (DL) of a communication connection (CC) between the base transceiver station (RBS) and the subscriber station (MS). A network inter-frequency (IF) handover means generates a network IF measurement trigger signal (NIFTS) when the transmission quality drops under a predetermined quality measure (QoS-MS). The generated network (IF) measurement trigger signal (NIFTS) is sent to the subscriber station (MS) and an IF measurement means (IFMM) in the subscriber station (MS) starts the IF measurements in response to a receipt of the network IF measurement trigger signal (NIFTS). One example of evaluating the quality on the down link of the communication connection (CC) is to monitor the transmitted output power on the down link. Thus, the network control means (RNC) can independently generate the trigger signal without the need of measurements from the subscriber station (MS) and without an additional interference on the up link due to a transmission of such measurements and without an unnecessarry reduction of the lifetime of the battery of the subsriber station (MS).