LRIC Brus99 Pres

8/2/2019 LRIC Brus99 Pres

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Techniques for analysing trafficto measure the LRIC of

interconnection services

Brussels, 10.12.1999

Prof. Dr. Ing. Klaus Hackbarth, GIT/UNICAN

www.dicom/unican.es [email protected]

Ralph-Georg Woehrl, WIKwww.wik.org [email protected]


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Content

Aims of bottom-up network analysis Efficient narrow-band network design

Traffic analysis: Basis for cost allocation ofinterconnection services

INEDAC software toolLink layer module TAROCA

Transmission layer module TOGOCA

Theory and practice


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Aims of bottom-up network analysis

Cost-oriented interconnection charges

based on FL-LRAIC

Overcoming the asymmetric information

problem

Understanding the nature of telcos networkcosts

Independence of incumbents database Transparent rate setting process


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Aims of bottom-up network analysis

Identifying cost drivers of interconnection services busy hour Erlang (bhe),busy hour call attempts (bhca)

Identifying network elements that are used in theefficient provision of interconnection services

compliance with the long run incremental coststandard,i.e. if traffic is the main cost driver, than the first

element from a subscriber viewpoint which is con-

centrating or blocking traffic is a component of thenetwork relevant for interconnection


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Efficient narrowband network designTypes of network models

Functional layer model

vertical view of the network

OSI reference model

modelling the link layer and physical layer

Partition model

horizontal view of the network

geographical extensions of a network used to identify relevant elements


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Efficient narrowband network designPartition model of the PSTN/ISDN

SubscriberAccess Network

AccessNetwork

BackboneNetwork

local loop

MDF SLIC

remote concentrator

ADM/SDH fibre rings

local/area exchanges transit exchanges

DX4/SDH meshed fibre topology

POIs

ANI SNI

traffic sensitive partnon-traffic sensitive + traffic routing


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Efficient narrowband network designNetwork design in functional layer model

Two-tier backbone network upper level and lower level backbone nodes form

a heavy meshed network structure

Degree of meshing determined thresholds

One-tier or two-tier access network

Star or double star topology on the logical layer

Ring structure on the transport layer

Local switching functions in intermediate nodes


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Efficient narrowband network designNetwork design (logical layer)


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Efficient narrowband network designNetwork design (transport layer)


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Efficient narrowband network designInput data for the core network model

Network data estimated outgoing traffic per line

analogue, basic and primary rate ISDN

MDF-locations; number of lines design assumptions

Investment data

asset replacement values and structureparameters

mark-up for indirectly attributable investment


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Efficient narrowband network designNetwork dimensioning

Node classification and assignment

Traffic matrix generation

Traffic routing and circuit group dimensioning

Transfer of routing data into a physicaldimensioning

Topology design

Circuit routing

System assignment


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Traffic analysis: Basis for cost allocation ofinterconnection services

The INEDAC Program Tool

INEDAC

(Integrated network design,dimensioning and cost

calculation) Coperation between GIT and WIK

Analyses costs and inter-connection issues in telcoms-networks

ITAGO: Interface betweenTAROCA and TOGOCA

Logical layer Physical layer

TAROCA TOGOCA

Cost analysis

INEDAC

ITAGO


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Three layer basic model of TAROCA(Traffic routing and cost analysis)

Three level logical layer model and the corresponding

nomenclature

I JeIJ

eiI

eJi

eiJ

eij

VjVi2

Vi1

Va

eIi

ei1i2

Concentrator

Access node (subscriber

switching node)

Lower level backbone (transit)

node

upper level backbone (transit)

node


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I1

First extension of the basic model

Model extension by duplication of upper backbonenodes

I1 I1

I1

i j

Final link

Direct link between lower

level nodes

Duplication of the upper backbone

nodes and the final links fornetwork reliability and congestion

avoidance

Direct link between a lower

and an upper level node


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Second extension of the basic model

Model extension by functional separation:

i j

JI

Direct link between

lower level nodes

First overflow link

between a lower and an

upper level

Final link

Function of the

upper level node

Function of the

lower level node

Function of the

subscriber level node


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Third extension of the basic model

Model with doubling and separation

i j

JI

Internal connection

between switchingfunctions inside of onenode


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Design and dimensioning proceduresinside of TAROCA

CLASIG - classification and assignation of nodes

TRADIS - traffic distribution

FTRAROUT - first traffic routing and circuit calculation

STFTRAROUT - second, third and fourth traffic routing


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CLASIG

Level determination for each node depending on trafficvalues and distance threshold

Assignation of lower level nodes to upper level nodesby distance and capacity limits

Assignation of POIs and of the interconnection traffic only at upper level backbone nodes

at each backbone node

mixed: one part at upper level backbone node and the other

one at each backbone node


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TRADIS

Traffic per subscriber line outgoing and intra traffic

outgoing and incoming general interconnection traffic

outgoing and incoming special interconnection traffic

Calculations first the intra-node traffic second the traffic matrix between all nodes using a generic

traffic distribution function with two figures, traffic load andgeographical distance.

third for each node the total incoming intra-net traffic and

fourth for each interconnecting node the total outgoing andincoming interconnection traffic (general and special)


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FTRAROUT

Routing between access and backbone part Access nodes assigned to a specific backbone

node build a star shaped cluster

Backbone nodes complete meshed structure No distinction between lower and upper BB-nodes

Dimensioning of circuits under Erlang - traffic lossformula (Poisson distribution)

Both-way use of the E1-Groups (max. 30 circuits)

STF TRAROUT


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STFoTRAROUT

Constitutes direct links between lower backbone nodes

Calculates the overflow traffic to the first overflow path Constitutes direct/first overflow links between a lower

and an upper backbone node

Calculates overflow traffic to the links of the final path

vi vj

vli vlj

tijc

tijo, vij

o

tijo, vijo

Th d P ti


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Theory and Practice

Node input file (525 sites) Configuration parameter file

Election of optimal parameters

Criteria of minimisation: groups*length

Results :

Demonstration of the tool

nnodt nnodl1 nnodl2 nnodl3

525 425 80 20

Th d P ti


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Theory and Practice

Th d P ti


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Theory and Practice

Th r d Pr ti


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Theory and Practice

Theory and Practice


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Theory and Practice

TOGOCA and its relation with logical layers


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g y

STM1

ISDNFrame

Relay

E1 E3

ATM

Transport network optimisation was based inthe past only on PST/ISDN neglecting demand

for FR and broadband/multimedia

Stable Demand structures and tools for FR and

ATM layer emulation currently hardly

available,

the INEDAC project uses as first

approximation a linear approach based on E1

demand thresholds and hence TOGOCA

design the physical network for multi

requirements

ISDN

E3

E1

ITAGOSTM1

ITAGO


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ITAGO

TAROCA and TOGOCA are stand alone tools with their proper

data structure

ITAGO connects both tools and generates:

a node list from all backbone nodes of TAROCA

a demand list from the logical backbone links of TAROCAconsidering either demand splitting for multipath-routing oradditional stand-by capacity for each demand relation

adds to the demand list groups from other logical layers andleased lines (mainly E3 from Frame Relay and STM-1 groups

from ATM)

an initial physical topology under distance thresholds

Transport network design module


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Transport network design moduleTOGOCA

The main task of TOGOCA is:

design of the physical topology for the transport network

routing of the demand groups

assignement of transmission systems and crossconnect

equipment

cost analysis based on nodes, links and routes

TOGOCA considers transmission systems and cross-connecting equipment from the SDH/SONET hierarchy andfibre optical physical links


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Global Structure of TOGOCA

Interface Toot

Result Toot

_tootsol.txt

_tootana.txt

Interface Sysassign

Result Sysassign

Interface Route

Result Route

Link file

Node file

Demand file

SDH parameter file

Cost related file

TOGOCA scenario

file

1 2 3

_sorpta.txt

_sorptr.txt

_soredge_flow.txt

_sornod.txt

Sup E3

ITAGOSup STM1

TAROCA node file

TAROCA E1 group file


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Study of an efficient transport networkTopology...(TOOT)

Algorithm INITSOL:Use the pre-configured

network from ITACO

without any

topological

optimisationAlgorithm

BICONSOL:

Design of an

optimal

biconnectednetwork

topology


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Study of an efficient transport network(ROUTE)


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Study of an efficient transport network(SYSASSIGN)


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Study of an efficient transport networkResults

Comparison of a network with and withoutoptimisation

Cost comparison of an exemplary E1 link in a pure ISDN withan integrated transport network for three logical layers

Parameters INITSOL BICONSOL

Number of links 2427 91

Total costs (million Euros) 2515 18.5

Routing factor (rfac1) 1.566 10.4324

Alocation of costs length E1 E3 STM1

Cost per E1 for ISDN Service 177 116,72 0 0

Cost per E1 for all service 177 47,85 1004,96 3014,89

Allocation of costs Length E1 E3 STM1

Costs per E1 for ISDN Service 40 201.25 0 0

Costs per E1 for all services 40 121,86 2559,08 7677,25

Summary


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Summary

Advantages of INEDAC

endogenous generation of traffic data and therefore

independence from operator input-data

ability to emulate any network configuration

between already existing and optimised future networks

considering state of the art equipment and future evolution

possibility to analyse costs of intra-net and interconnectionservices

A li i


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Applications

The Austrian NRA TKC is using the GIT/WIK-model tosupport decisions on interconnection right now

The German NRA Reg TP will use the model to setelement based charges for IC services in 2000

Research project MUSSAT for strategic networkstudies and LRIC evaluation based on a database forall Spanish villages

Application of TAROCA/TOGOCA for a strategic

design study of the ISDN from Honduras operated byHondutel

Future Extensions


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Future Extensions

TAROCA

improvement of the CLASIG Algorithm (PClustA, WHLP)

downstairs traffic overflow

traffic matrix generation for distance clusters

ITAGO

predetermined or pre-optimised initial topologies

ring topology around nodes with high traffic load in combinationwith penalty routing

TOGOCA:

Extension of the routing concept (three path routing, routing with

penalty values for some links)

introduction of equipment from DWDM in the module of SYSAG

new phontinic layer with corresponding DWEDM equipment as

OADM o OX

s

optical layer


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optical layer

Optical signal

40 Gbps

Physical layer

Transconnection

Physical layer (Signal

transmission)

Physical layer

(DWDM and transmission)

STM1

STM1 electric

OC 481 16

1 16

DX4/4

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