Multiple-access communications system
Patent 4612637 Issued on September 16, 1986. Estimated Expiration Date: 
July 23, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 23, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re28577 Asynchronous multiplexer and demultiplexer combination Patent #: 3982077 InventorsApplicationNo. 06/633547 filed on 07/23/1984US Classes:370/348, Channel reservation scheme370/443, Using channel reservation370/445Carrier sense multiple access (CSMA)ExaminersPrimary: Olms, Douglas W.Assistant: Scutch, III, Frank M. Attorney, Agent or FirmInternational ClassesH04Q 7/28 (20060101)H04L 12/56 (20060101) Foreign Application Priority Data1983-08-01 GBAbstractA 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. | |
