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Decentralized Control Dynamic Bandwidth Allocation for Satellite TDMA: Allocation TDMA

IP.com Disclosure Number: IPCOM000052544D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Ulmer, S: AUTHOR

Abstract

Decentralized-control dynamic bandwidth allocation in a Reservation-TDM (R-TDMA) usually works in such a way that a station makes a reservation for a data slot through a message in its reservation slot. This reservation and the other reservations from the other station are taken into account by a slot scheduler algorithm that runs synchronously in all stations.

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Decentralized Control Dynamic Bandwidth Allocation for Satellite TDMA: Allocation TDMA

Decentralized-control dynamic bandwidth allocation in a Reservation-TDM (R-TDMA) usually works in such a way that a station makes a reservation for a data slot through a message in its reservation slot. This reservation and the other reservations from the other station are taken into account by a slot scheduler algorithm that runs synchronously in all stations.

The algorithm depends on the correct reception of all reservation messages in all stations. R-TDMA is therefore sensitive to channel noise, and even extensive error correction coding does not completely solve the problem.

This article presents a method that does not use control channels and that is strong in the presence of channel noise.

The essential elements of the proposed method, which we designate as "Allocation-TDMA" (A-TDMA), are: a data slot is not reserved by the station that intends to use it, but it is explicitly given over (allocated) by the station that owns it, to a station that can make use of it, traffic backlog information is communicated via data slots instead of via separate reservation slots, and explicit allocation messages are sent by the slot owner station to the beneficiary station.

Mode of Operation of A-TDMA: Each station owns one time slot of fixed (pre- assigned) length in the TDMA cycle. Each station communicates regularly information on its traffic backlog via a special broadcast message, which is a part of its regular outgoing data flow. If a station has excess bandwidth, i.e., if it has no traffic backlog and cannot fill up its current time slot, it allocates its next time slot to a station that does have a traffic backlog, according to some priority scheme. This allocation is communicated to the intended beneficiary via a special message, which is also a part of the regular out...