A method for avoiding an unnecessarily high energy consumption of mobile stations which are included in a digital time-multiplex mobile telephony system. In an idle mode, each of the mobile stations normally listens on only each Nth time slot of a channel which, among other things, is intended for the transmission of paging messages, e.g. the CCCH-channel in GSM. In order to reduce the time of establishing a call connection, the system includes the possibility of applying a so-called extended page mode, wherein a time slot, e.g. time slot N, may contain information instructing the mobile stations to listen also on an additional time slot, e.g. time slot N+2. According to the invention, the extended page mode can be applied significantly with regard to time gain and increased energy consumption, in the following manner : There is decided a percentage which corresponds to a maximum value for the percentage of paging messages that may be transmitted in the extended page mode. A decision is then reached as to whether an extended page mode is used, depending, in each separate case, whether or not there is a need for an extended page mode, whether or not the additional time slot has a free space, and whether or not the percentage decided has been exceeded.
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