| 摘要 |
The information is transmitted by a carrier signal within a plurality of successive time frames partitioned each by a predetermined number of time intervals, each of them being allocated to a predetermined group of receivers. The receivers of each group are further divided into a predetermined number of identifiable subgroups of receivers. All the receivers of the group at the beginning of the corresponding allocated time interval are activated, and all receivers of the group receive a service information to identify which are the subgroups whose receivers are susceptible of receiving a message, said service information is analysed within each receiver and, before the end of said time interval (I3) any receiver which does not belong to one of the designated subgroups is deactivated. |
