Multiplex communications – Wide area network – Packet switching
Patent
1989-01-03
1990-05-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082508, H04J 316
Patent
active
049244620
ABSTRACT:
In an exemplary communications system a multiplicity of mobile terminals are to share a communications link with a primary processor. The primary processor may transmit a multiterminal polling signal defining a series of successive response time slots which the terminals may randomly select. A terminal wishing to send a message transmits a brief response burst in the selected time slot giving its identification. The primary processor may then sequentially poll specific individual terminals having messages to send. The primary processor may maintain a record of currently active terminals and/or of collisions (where more than one terminal seeks to transmit in the same response time slot), and as needed may automatically send e.g. with its multiterminal poll, a time slot number change, creating a greater or lesser number of time slots for future use by the active terminals. The system is thus highly adaptable on a dynamic basis during operation so as to readily maintain optimum throughput under changing conditions. As a consequence additional terminals may become active simply by transmitting their respective identifications in randomly selected response time slots. The multiterminal poll may include a listing of one or more terminals for which the primary processor has a message so that the primary processor may be assured that such terminal is available (as indicated by its response in a random time slot) before a lengthy message is sent.
REFERENCES:
patent: 4744077 (1988-05-01), Fadem et al.
patent: 4809268 (1989-02-01), Tejima et al.
Norand Corporation
Olms Douglas W.
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