NGN Planning and
QoS Aspects
ITU-D Regional Development Forum for the EUR and CIS Region
NGN and Broadband, Opportunities and Challenges
Chisinau, Moldova, 24 – 26 August 2009
Types of the network planning problems
– Market forecasting
– Trends of network utilization
– Technological changes
– Cost estimation model
High-level planning
problems
– Analysis of the forecasts
– Choice of the network structure
– Estimations of the throughput
Network resources
planning
– Detailed planning
– Elaboration of the technical
documentation
Network elements
planning
– Topology design
– Choice of the cable paths
– Elaboration of the specifications
1
Three types of the planning algorithms
Traffic estimation algorithm for the NGN
I
Determining the traffic matrices for voice services
II
Evaluation of the data traffic
III
Evaluation of the video traffic
IV
Forecasting of the traffic matrices change
V
VI
No
Corrections
Is solution
acceptable?
Yes
Next stage of the planning
VII
2
Access bandwidth forecasting
Households share, %
100
100 Mb/s
and more
80
60
24 Mb/s
40
6 Mb/s
1,5 Mb/s
20
Year
1995
2000
2005
2010
2015
2020
2025
Two level NGN model
I.
Control layer
II. IP packets transmission layer
3
Quality of service indices (Y.1541)
QoS class
IPTD
IPDV
IPLR
IPER
0
100 ms
50 ms
10-3
10-4
1
400 ms
50 ms
10-3
2
100 ms
U
10-3
3
400 ms
U
10-3
4
1s
U
10-3
5
U
U
U
U
About IPDV definition
4
Speech path model in the NGN
QoS aspect: time irreversibility
Speech quality impairment compensation in CS
networks:
Elaboration of the speech signal processing algorithms;
Signal amplification (when necessary).
Speech quality impairment compensation in IP networks
under condition of the excessive packet exchange delay:
Impossible
in principle!!!
5
QoS indices decomposition (1)
QoS indices decomposition (2)
6
Error in quantile estimation for the
exponential distribution
Exact value
Value by
Y.1541
Absolute
error
Relative error
p = 0.95
p = 0.99
p = 0.999
12.59
16.81
22.45
25.80
34.12
43.55
13.21
17.31
21.10
1.05
1.03
0.94
Queueing systems analysis
λ = min {λ j },
µ = max {µ j }.
7
Behaviour of the incoming flow
Poisson flow of the calls generates Poisson flow of the IP
packets
Choice of the number of nodes
8
Conclusions
1. NGN planning is a complicated task since
multiservice traffic peculiarities have to be taken
into consideration.
2. QoS indices related to triple-play services are
important for the NGN planning.
3. For the NGN planning, it is necessary to
elaborate new methods of the teletraffic system
analysis. These methods should consider packet
technology specifics.
NGN Planning and QoS Aspects
Thank you!
Nikolay Sokolov
Andrey Sokolov
e-mail: sokolov@niits.ru
e-mail: asokolov@seventest.ru
ITU-D Regional Development Forum for the EUR and CIS Region
NGN and Broadband, Opportunities and Challenges
Chisinau, Moldova, 24 – 26 August 2009
9