Multiple-access control for a communication system with order pa

Details Multiple-access control for a communication system with order pa Multiple-access control for a communication system with order pa

1991-03-20

1992-12-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, 370 852, H04J 324

Patent

active

051738988

ABSTRACT:
In a communication system comprising node stations connected to a bus, a headend unit releases, for sequentially numbered cycles, time slots as previously requested in an order pad passing procedure. In the order pad procedure, the headend issues a special frame in which stations insert the number of slots required to transmit data in a subsequent cycle. To enable reuse of time slots which otherwise would be utilized only during a fraction of their existence (i.e. from a source to a destination which in many cases are located close together), the order pad additionally includes a furthest destination label (DST-MAX) and a requested maximum (REQ-MAX) which are updated at each node. This allows to set, for any cycle, at some nodes a reuse flag (REU-FLG). In this way, the bus is partitioned into sections according to actual traffic, and the headend only releases a number of time slots which satisfies the needs of the section where the maximum of time slots was requested. Thus, the number of time slots, i.e. the length of each cycle can be significantly reduced, thereby increasing system throughput.

REFERENCES:
patent: 4528663 (1985-07-01), Citta
patent: 4763321 (1988-08-01), Calvignac et al.
patent: 5003531 (1991-03-01), Farinholt et al.

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