Leistungseinsparung in einem batteriebetrieben Selektivrufsystem

摘要

Selective call systems such as the CCIR Radiopaging Code No. 1 (or POCSAG) has a signal format giving an inherent battery power conservation duty cycle of 1:8 requiring a bit synchronised pager to energise its receiving section to receive the synchronisation codeword and again for the duration of its assigned frame in each batch. For those pagers wanting to operate in accordance with a longer duty cycle, successive superbatches of N batches are created and the pager is assigned to say one frame only of the superbatch. However in order to obtain synchronisation in the superbatch, a predetermined codeword (PCW) is transmitted in the first frame of the first batch of the N batches. A pager which has achieved batch and superbatch synchronisation de-energises its receiving section until its assigned frame. The transmission of a predetermined codeword once in every N batches is transparent to the pagers operating the 1:8 duty cycle and also facilitates recovery of superbatch synchronisation in deep fade and carrier lost situations.