Industrial and academic experience in performance analysis and modelling for a broad range of ICT technologies (wireline and wireless/mobile telephony, SS7, AIN, ATM and MPLS broadband networks, GSM/GPRS/EDGE, WCDMA/UMTS Address: Adelaide, South Australia, Australia
La presente invention concerne un systeme et un procede destines a la mise en oeuvre de plusieurs... more La presente invention concerne un systeme et un procede destines a la mise en oeuvre de plusieurs types de trafics d'application via des reseaux orientes connexion. En l'occurrence, des donnees sont recues (110) en provenance de plusieurs applications, notamment sous a forme d'unites de donnees, en association avec un type de trafic permettant de classer les unites de donnees en trafic inelastique ou en trafic elastique (112). Les donnees associees avec du trafic inelastique sont mises en relation avec au moins uneconnexion d'un premier type de connexion qui garantit une certaine quantite de largeur de bande et limite les ecarts temporels (114). Les donnees associees avec du trafic elastique sont mises en relation avec au moins une connexion d'un second type qui ne garantit aucune largeur de bande (116). Les connexions du second typepeuvent garantir que les unites de donnees du trafic elastique prises en compte pour transfert par le reseau sous-jacent sont remise...
Bibliography: leaves 119-125.. viii, 125 leaves; 30 cm.. Title page, contents and abstract only. ... more Bibliography: leaves 119-125.. viii, 125 leaves; 30 cm.. Title page, contents and abstract only. The complete thesis in print form is available from the University Library.. Thesis (Ph. D.)--University of Adelaide, Dept. of Applied Mathematics, 1995?
2018 Military Communications and Information Systems Conference (MilCIS), 2018
This paper describes the need for management of transmission powers in mobile land networks in or... more This paper describes the need for management of transmission powers in mobile land networks in order to achieve low probability of detection. It explores applicable work in topology control and presents sub-graph search, a localized search method for finding the topology with the lowest detectability footprint. It presents algorithms which can be applied to existing topology control techniques in order to minimise the probability of detection and evaluates them using demonstration and comparison to the sub-graph search method.
but not in part, this specification for its members internal use only and not for further distrib... more but not in part, this specification for its members internal use only and not for further distribution. This right shall not be, and is not, transferable. All other rights reserved. Except as expressly stated in this notice, no part of this document may be reproduced or transmitted in any form or by any means, or stored in any information storage and retrieval system, without the prior written permission of The ATM Forum. The information in this publication is believed to be accurate as of its publication date. Such information is subject to change without notice and The ATM Forum is not responsible for any errors. The ATM Forum does not assume any responsibility to update or correct any information in this publication. Notwithstanding anything to the contrary, neither The ATM Forum nor the publisher make any representation or warranty, expressed or implied, concerning the completeness, accuracy, or applicability of any information contained in this publication. No liability of any ...
Today’s converged networks are increasingly based on MPLS technology. To provide reliable carrier... more Today’s converged networks are increasingly based on MPLS technology. To provide reliable carrier-grade service, MPLS-based recovery procedures must be able to quickly address any link or node failure. Current standardized MPLS fast recovery mechanisms cannot cope with egress node failure. We present a dual plane core network architecture, a path naming convention and a simple recovery mechanism that together can remove that fundamental limitation. Keywords-MPLS; fast re-route; node failure; survivability.
It has recently been shown that networks of queues with state-dependent movement of negative cust... more It has recently been shown that networks of queues with state-dependent movement of negative customers, and with state-independent triggering of customer movement have product-form equilibrium distributions. Triggers and negative customers are entities which, when arriving to a queue, force a single customer to be routed through the network or leave the network respectively. They are ‘signals' which affect/control network behaviour. The provision of state-dependent intensities introduces queues other than single-server queues into the network. This paper considers networks with state-dependent intensities in which signals can be either a trigger or a batch of negative customers (the batch size being determined by an arbitrary probability distribution). It is shown that such networks still have a product-form equilibrium distribution. Natural methods for state space truncation and for the inclusion of multiple customer types in the network can be viewed as special cases of this s...
—Electromagnetic spectrum is a scarce resource. Spectrum licensing is estimated to consume about ... more —Electromagnetic spectrum is a scarce resource. Spectrum licensing is estimated to consume about 20% of cellular operators' capital expenditure (CAPEX). One important measure of spectrum use is " spectral efficiency " (SE), which is the amount of data bandwidth that a specific technology can extract from a certain amount of radio spectrum and is measured in bits per second per Hz (bps/Hz). Using data from 4 different mobile operators, we show that spectral efficiency as the measure of bits per second per Hz correlates poorly with users' performance on cellular networks. Applying spectral efficiency directly in network performance monitoring or in network planning can provide misleading diagnostics and poorly targeted expansion plans. We propose a new spectral efficiency metric that combines the raw bit per second per Hz measurement with user perceived performance. We show that this new metric correlates well with measured user throughput and is superior metric for network planning and performance monitoring in real networks. We present a number of applications of our new metric on network management and capacity planning tasks. Our implementation of this approach has been used in operational networks for over 8 years and has provided sound basis for CAPEX decision making.
Today's converged networks are increasingly based on MPLS technology. To provide reliable car... more Today's converged networks are increasingly based on MPLS technology. To provide reliable carrier-grade service, MPLS-based recovery procedures must be able to quickly address any link or node failure. Current standardized MPLS fast recovery mechanisms cannot cope with egress node failure. We present a dual plane core network architecture, a path naming convention and a simple recovery mechanism that together can remove that fundamental limitation.
A product form equilibrium distribution is derived for a class of queueing networks, in either di... more A product form equilibrium distribution is derived for a class of queueing networks, in either discrete or continuous time, in which multiple customers arrive simultaneously, multiple customers complete service simultaneously, and any event occurring in the network can force/trigger the release of multiple customers to be routed through the network.
Bellcore is responsible for developing and maintaining requirements for the telecommunications pr... more Bellcore is responsible for developing and maintaining requirements for the telecommunications protocols and network elements (NEs) that are supported by our owner companies, the Regional Bell Operating Companies (RBOCs) in the North American market. The requirements, when deployed, allow interoperability between NEs built by different suppliers, which is essential in a multi-supplier network. The major intelligent network (IN) service deployed
La presente invention concerne un systeme et un procede destines a la mise en oeuvre de plusieurs... more La presente invention concerne un systeme et un procede destines a la mise en oeuvre de plusieurs types de trafics d'application via des reseaux orientes connexion. En l'occurrence, des donnees sont recues (110) en provenance de plusieurs applications, notamment sous a forme d'unites de donnees, en association avec un type de trafic permettant de classer les unites de donnees en trafic inelastique ou en trafic elastique (112). Les donnees associees avec du trafic inelastique sont mises en relation avec au moins uneconnexion d'un premier type de connexion qui garantit une certaine quantite de largeur de bande et limite les ecarts temporels (114). Les donnees associees avec du trafic elastique sont mises en relation avec au moins une connexion d'un second type qui ne garantit aucune largeur de bande (116). Les connexions du second typepeuvent garantir que les unites de donnees du trafic elastique prises en compte pour transfert par le reseau sous-jacent sont remise...
Bibliography: leaves 119-125.. viii, 125 leaves; 30 cm.. Title page, contents and abstract only. ... more Bibliography: leaves 119-125.. viii, 125 leaves; 30 cm.. Title page, contents and abstract only. The complete thesis in print form is available from the University Library.. Thesis (Ph. D.)--University of Adelaide, Dept. of Applied Mathematics, 1995?
2018 Military Communications and Information Systems Conference (MilCIS), 2018
This paper describes the need for management of transmission powers in mobile land networks in or... more This paper describes the need for management of transmission powers in mobile land networks in order to achieve low probability of detection. It explores applicable work in topology control and presents sub-graph search, a localized search method for finding the topology with the lowest detectability footprint. It presents algorithms which can be applied to existing topology control techniques in order to minimise the probability of detection and evaluates them using demonstration and comparison to the sub-graph search method.
but not in part, this specification for its members internal use only and not for further distrib... more but not in part, this specification for its members internal use only and not for further distribution. This right shall not be, and is not, transferable. All other rights reserved. Except as expressly stated in this notice, no part of this document may be reproduced or transmitted in any form or by any means, or stored in any information storage and retrieval system, without the prior written permission of The ATM Forum. The information in this publication is believed to be accurate as of its publication date. Such information is subject to change without notice and The ATM Forum is not responsible for any errors. The ATM Forum does not assume any responsibility to update or correct any information in this publication. Notwithstanding anything to the contrary, neither The ATM Forum nor the publisher make any representation or warranty, expressed or implied, concerning the completeness, accuracy, or applicability of any information contained in this publication. No liability of any ...
Today’s converged networks are increasingly based on MPLS technology. To provide reliable carrier... more Today’s converged networks are increasingly based on MPLS technology. To provide reliable carrier-grade service, MPLS-based recovery procedures must be able to quickly address any link or node failure. Current standardized MPLS fast recovery mechanisms cannot cope with egress node failure. We present a dual plane core network architecture, a path naming convention and a simple recovery mechanism that together can remove that fundamental limitation. Keywords-MPLS; fast re-route; node failure; survivability.
It has recently been shown that networks of queues with state-dependent movement of negative cust... more It has recently been shown that networks of queues with state-dependent movement of negative customers, and with state-independent triggering of customer movement have product-form equilibrium distributions. Triggers and negative customers are entities which, when arriving to a queue, force a single customer to be routed through the network or leave the network respectively. They are ‘signals' which affect/control network behaviour. The provision of state-dependent intensities introduces queues other than single-server queues into the network. This paper considers networks with state-dependent intensities in which signals can be either a trigger or a batch of negative customers (the batch size being determined by an arbitrary probability distribution). It is shown that such networks still have a product-form equilibrium distribution. Natural methods for state space truncation and for the inclusion of multiple customer types in the network can be viewed as special cases of this s...
—Electromagnetic spectrum is a scarce resource. Spectrum licensing is estimated to consume about ... more —Electromagnetic spectrum is a scarce resource. Spectrum licensing is estimated to consume about 20% of cellular operators' capital expenditure (CAPEX). One important measure of spectrum use is " spectral efficiency " (SE), which is the amount of data bandwidth that a specific technology can extract from a certain amount of radio spectrum and is measured in bits per second per Hz (bps/Hz). Using data from 4 different mobile operators, we show that spectral efficiency as the measure of bits per second per Hz correlates poorly with users' performance on cellular networks. Applying spectral efficiency directly in network performance monitoring or in network planning can provide misleading diagnostics and poorly targeted expansion plans. We propose a new spectral efficiency metric that combines the raw bit per second per Hz measurement with user perceived performance. We show that this new metric correlates well with measured user throughput and is superior metric for network planning and performance monitoring in real networks. We present a number of applications of our new metric on network management and capacity planning tasks. Our implementation of this approach has been used in operational networks for over 8 years and has provided sound basis for CAPEX decision making.
Today's converged networks are increasingly based on MPLS technology. To provide reliable car... more Today's converged networks are increasingly based on MPLS technology. To provide reliable carrier-grade service, MPLS-based recovery procedures must be able to quickly address any link or node failure. Current standardized MPLS fast recovery mechanisms cannot cope with egress node failure. We present a dual plane core network architecture, a path naming convention and a simple recovery mechanism that together can remove that fundamental limitation.
A product form equilibrium distribution is derived for a class of queueing networks, in either di... more A product form equilibrium distribution is derived for a class of queueing networks, in either discrete or continuous time, in which multiple customers arrive simultaneously, multiple customers complete service simultaneously, and any event occurring in the network can force/trigger the release of multiple customers to be routed through the network.
Bellcore is responsible for developing and maintaining requirements for the telecommunications pr... more Bellcore is responsible for developing and maintaining requirements for the telecommunications protocols and network elements (NEs) that are supported by our owner companies, the Regional Bell Operating Companies (RBOCs) in the North American market. The requirements, when deployed, allow interoperability between NEs built by different suppliers, which is essential in a multi-supplier network. The major intelligent network (IN) service deployed
Product form queueing networks are often used to model systems as diverse as communications proto... more Product form queueing networks are often used to model systems as diverse as communications protocols, computer systems, ecological systems, neural networks and manufacturing processes. For this reason a lot of effort has been invested by researchers in extending the set of queueing networks which are known to have a product form queue length distribution.
Recently Gelenbe demonstrated that queueing networks can include entities which he described as negative customers, triggers and signals and retain product form. This thesis describes and solves new networks (which include these entities) incorporating state dependent ring rates, multiple customer classes, batch movement and batch destruction. A number of applications for these networks are presented, including an application in which the queueing network results are applied to stochastic Petri nets to obtain a new class of nets which have product form.
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Papers by Bruce Northcote
Recently Gelenbe demonstrated that queueing networks can include entities which he described as negative customers, triggers and signals and retain product form. This thesis describes and solves new networks (which include these entities) incorporating state dependent ring rates, multiple customer classes, batch movement and batch destruction. A number of applications for these networks are presented, including an application in which the queueing network results are applied to stochastic Petri nets to obtain a new class of nets which have product form.