초록 ▼

A multiple-access communications system for an unlimited user population wherein a system controller continuously transmits Aloha signals on a slot-by-slot basis giving an updated number of time slots available whereby a calling party can select any one of the designated time slots at random. The ca

A multiple-access communications system for an unlimited user population wherein a system controller continuously transmits Aloha signals on a slot-by-slot basis giving an updated number of time slots available whereby a calling party can select any one of the designated time slots at random. The calling party checks the time slot immediately preceding its selected time slot to ascertain if the current Aloha number is zero (or an equivalent thereof). If it is zero then the calling party reverts to listening for a time slot containing an Aloha number greater than zero. Alternatively if it is not zero the calling party apparatus sends a signal to the system controller in its selected time slot. Multipurpose signalling in each time slot can be carried out by the system controller thereby reducing the overhead on the system and speeding-up the setting-up of calls which may be off-air or non off-air.

대표청구항 ▼

A time division multiple-access communication system comprising a plurality of transceivers and a system controller, in which communication between the system controller and the transceivers is effected in accordance with the following protocol: continuous transmission by the system controller of fr

A time division multiple-access communication system comprising a plurality of transceivers and a system controller, in which communication between the system controller and the transceivers is effected in accordance with the following protocol: continuous transmission by the system controller of framelength signals in successive time slots, each framelength signal including an Aloha number designating an updated number of immediately succeeding time slots which are available for signaling requests, whereby a calling transceiver seeking to signal the system controller can select any one of such available time slots at random; a calling transceiver checking the time slot immediately preceding the selected time slot to ascertain the Aloha number of the selected time slot; when the Aloha number of the selected time slot has a predetermined value, the calling transceiver reverting to listening for a time slot containing an Aloha number having other than said predetermined value; and when the Aloha number of the selected slot has other than said predetermined value, the calling transceiver signalling the system controller in such selected time slot.