Importance

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Abstract

A cellular radio system comprises a plurality of basic stations each having a radio transceiver serving a cell of the system. A mobile station of the invention has a radio transceiver for communicating with one or other of the base stations, as well as long term averaging units (LTA.sub.0, LTA.sub.1, LTA.sub.N) for time averaging handover criterion (HOC) measurements over a first averaging period. The mobile station also includes a summer (S.sub.N) for applying a first hysteresis margin to the time averaged HOC measurements to provide a first handover indicator. The mobile station also includes short term averaging units (STA.sub.0, STA.sub.1, STA.sub.N) for time averaging HOC measurements over a second averaging period which is relatively short compared to the first averaging period, as well as a summer (S.sub.W) for applying a second hysteresis margin, which is relatively large compared to the first hysteresis margin, to the time averaged HOC measurements to provide a second handover indicator. The mobile station further includes a gate (OR.sub.1) for assessing handover requirements of the mobile station on the basis of the first and second handover indicators, whereby on the one hand relatively gradual variations in HOC can be assessed and on the other hand relatively sudden variations in HOC can also be assessed.

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First Claim