lric brus99 pres
TRANSCRIPT
-
8/2/2019 LRIC Brus99 Pres
1/38
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]
-
8/2/2019 LRIC Brus99 Pres
2/38
2
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
-
8/2/2019 LRIC Brus99 Pres
3/38
3
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
-
8/2/2019 LRIC Brus99 Pres
4/38
4
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
-
8/2/2019 LRIC Brus99 Pres
5/385
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
-
8/2/2019 LRIC Brus99 Pres
6/386
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
-
8/2/2019 LRIC Brus99 Pres
7/387
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
-
8/2/2019 LRIC Brus99 Pres
8/38
8
Efficient narrowband network designNetwork design (logical layer)
-
8/2/2019 LRIC Brus99 Pres
9/38
9
Efficient narrowband network designNetwork design (transport layer)
-
8/2/2019 LRIC Brus99 Pres
10/38
10
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
-
8/2/2019 LRIC Brus99 Pres
11/38
11
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
-
8/2/2019 LRIC Brus99 Pres
12/38
12
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
-
8/2/2019 LRIC Brus99 Pres
13/38
13
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
-
8/2/2019 LRIC Brus99 Pres
14/38
14
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
-
8/2/2019 LRIC Brus99 Pres
15/38
15
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
-
8/2/2019 LRIC Brus99 Pres
16/38
16
Third extension of the basic model
Model with doubling and separation
i j
JI
Internal connection
between switchingfunctions inside of onenode
-
8/2/2019 LRIC Brus99 Pres
17/38
17
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
-
8/2/2019 LRIC Brus99 Pres
18/38
18
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
-
8/2/2019 LRIC Brus99 Pres
19/38
19
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)
-
8/2/2019 LRIC Brus99 Pres
20/38
20
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
-
8/2/2019 LRIC Brus99 Pres
21/38
21
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
-
8/2/2019 LRIC Brus99 Pres
22/38
22
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
-
8/2/2019 LRIC Brus99 Pres
23/38
23
Theory and Practice
Th d P ti
-
8/2/2019 LRIC Brus99 Pres
24/38
24
Theory and Practice
Th r d Pr ti
-
8/2/2019 LRIC Brus99 Pres
25/38
25
Theory and Practice
Theory and Practice
-
8/2/2019 LRIC Brus99 Pres
26/38
26
Theory and Practice
TOGOCA and its relation with logical layers
-
8/2/2019 LRIC Brus99 Pres
27/38
27
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
-
8/2/2019 LRIC Brus99 Pres
28/38
28
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
-
8/2/2019 LRIC Brus99 Pres
29/38
29
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
-
8/2/2019 LRIC Brus99 Pres
30/38
30
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
-
8/2/2019 LRIC Brus99 Pres
31/38
31
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
-
8/2/2019 LRIC Brus99 Pres
32/38
32
Study of an efficient transport network(ROUTE)
-
8/2/2019 LRIC Brus99 Pres
33/38
33
Study of an efficient transport network(SYSASSIGN)
-
8/2/2019 LRIC Brus99 Pres
34/38
34
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
-
8/2/2019 LRIC Brus99 Pres
35/38
35
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
-
8/2/2019 LRIC Brus99 Pres
36/38
36
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
-
8/2/2019 LRIC Brus99 Pres
37/38
37
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
-
8/2/2019 LRIC Brus99 Pres
38/38
38
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