http://www.cnr.it/ontology/cnr/individuo/prodotto/ID20496
Robust Rate Control for Integrated Services Packet Networks (Articolo in rivista)
- Type
- Label
- Robust Rate Control for Integrated Services Packet Networks (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- F. Blanchini, R. Lo Cigno, R. Tempo (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
- Research on congestion-control algorithms has traditionally
focused more on performance than on robustness of the
closed-loop system to changes in network conditions. As the performance
of the control loop is strictly connected with the quality
of service, these systems are natural candidates to be approached
by the optimal control theory. Unfortunately, this approach may
fail in the presence of transmission delay variations, which are unavoidable
in telecommunication systems.
In this paper, we first show the fragility of optimal controllers
and demonstrate their instability when the control delay is not
known exactly. Then we propose a robust control algorithm based
on a classical proportional integral derivative scheme which does
not suffer from this fragility phenomenon. Its stability versus the
control delay variations, as well as versus sources that transmit less
than their computed share, is studied with Nyquist analysis. The
control algorithm is implemented within a simulator in the framework
of the asynchronous transfer mode (ATM) ABR transfer capability.
The final part of the paper shows some selected results assessing
the performance of the control algorithm in a realistic network
environment. ABR was chosen as an example, but the control
studied here can be applied in any data network to obtain a robust
and reliable congestion-control scheme.
(literal)
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- F. Blanchini is with the Dipartimento di Matematica e Informatica, Università degli Studi di Udine, 33100 Udine, Italy (e-mail: blanchini@uniud.it).
R. Lo Cigno is with the Dipartimento di Elettronica, Politecnico di Torino,
10129 Torino, Italy (e-mail: locigno@polito.it).
R. Tempo is with IRITI-CNR, Politecnico di Torino, 10129 Torino, Italy
(e-mail: tempo@polito.it).
(literal)
- Titolo
- Robust Rate Control for Integrated Services Packet Networks (literal)
- Abstract
- Research on congestion-control algorithms has traditionally
focused more on performance than on robustness of the
closed-loop system to changes in network conditions. As the performance
of the control loop is strictly connected with the quality
of service, these systems are natural candidates to be approached
by the optimal control theory. Unfortunately, this approach may
fail in the presence of transmission delay variations, which are unavoidable
in telecommunication systems.
In this paper, we first show the fragility of optimal controllers
and demonstrate their instability when the control delay is not
known exactly. Then we propose a robust control algorithm based
on a classical proportional integral derivative scheme which does
not suffer from this fragility phenomenon. Its stability versus the
control delay variations, as well as versus sources that transmit less
than their computed share, is studied with Nyquist analysis. The
control algorithm is implemented within a simulator in the framework
of the asynchronous transfer mode (ATM) ABR transfer capability.
The final part of the paper shows some selected results assessing
the performance of the control algorithm in a realistic network
environment. ABR was chosen as an example, but the control
studied here can be applied in any data network to obtain a robust
and reliable congestion-control scheme.
(literal)
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