Network Planning and Operation Tool

Networks and Optical Communications group – NOC

Network Planning and Operation Tool

Dimitrios Klonidis

C. Kachris, P. Zakynthinos, I. Tomkos

New challenges in network planning

 Upcoming services are huge bandwidth generating sources:

• Video services

• Data services to/from mobile users • Cloud services

 These new traffic sources lead to new characteristics:

• Rapidly changing traffic patterns - high traffic churn

• High peak-to-average traffic ratio • Large data-chunk transfers

• Asymmetric traffic between nodes • Increasing high-QoS traffic

• …

 Maintaining network resource over-provisioning is not possible any more

Source: Transmode

Over-provisioning

3 _{www.ait.edu.gr}

Spectrally flexible networking

Moving …

from a typical WDM approach with wavelength only

allocation over a fixed grid

to a flexible optical approach with multi-rate, multi-carrier and multi-format signals being allocated over multiples of narrow grid channels (or grid-less”

Spatially & Spectrally flexible networking

Conventional optical OFDM Optical fast OFDM

(N-1)/T

(N-1)/2T

N is the channel number (=7 in this example)

(a) (b)

Frequency Frequency

Conventional optical OFDM Optical fast OFDM

(N-1)/T

(N-1)/2T

N is the channel number (=7 in this example)

(a) (b) N-WDM or OFDM or SC-M-QAM Fibre, Mode, Core Modes/Cores Wavelengths Data rate

(Symbol rate + subcarrier multiplicity)

Modes or Cores f f f f f

: end-to-end allocated channel “Spatial expansion of the

spectrum over multiple modes/cores and therefore definition of a superchannel over two dimensions (instead of the spectrum only

5 _{www.ait.edu.gr}

The network planning issue



As new traffic demands arrive (dynamically), the network controller

must compute the end-to-end path according to available resources



However, resources are not restricted to wavelength channels only

(as in WDM) but can be:

• Modulation level and number of subcarriers

• Wavelength slot (super-channel) to accommodate the bandwidth of the demand

• Core/mode or fibre to accommodate the wavelength slot



As a result, network planning becomes a multi-dimensional problem



Additional planning issues can relate with:

Multi-domain planning issues for IP-OpticalLayer co-optimization

What is a NPOT?



NPOT: Network Planning and Operation Tool

• NPOT provides the planning of network resources in real time and according to traffic demands, deciding and “suggesting” the operation options for “optimized” networking



NPOT functions:

• Maintains the network topology map

• Maintains knowledge about the available network resources

• Calculates the physical layer performance of the possible end-to-end lightpaths (in the presence of other lightpaths)

• Identifies a set of the “best” available lightpaths for specific connection demands

• Suggests the establishment of lightpaths that “optimizes” the network performance, while also maintains alternative paths for fast restoration.

 Optimization can refer to: cost and energy consumption minimization, increase of resource utilization, guaranties for specific service classes etc.



NPOT location:

• An element of a centralized network controller that interfaces with the path establishment modules

 … so it is mainly proposed for centralized networking approaches, although distributed NPOT version have also been examined

7 _{www.ait.edu.gr} Wavelength allocation Reconfigurable - Dynamic routing - λ-tunable TxRx - WS switching Wavelength + Bandwidth allocation

Wavelength + Bandwidth + Spatial

allocation Constraint based optimized routing - PL Impairment awareness - Energy awareness

Flexible Optical Networking

- Combined selection of channel bandwidth (format/ data rate) and spectral allocation

according to: demand, distance and required performance - λ + format/rate tunable TxRx - Flexible switching of variable spectral slots at different wavelengths

- Optimized spectral usage

Static - P re -p lan n ed - High d at a rate P 2 P

Cognitive optical networking

- Self-learning network optimization and adaptation

- Significant reduction of routing calculation complexity

Spatially and Spectrally Flexible Optical Networking

- Extend flexibility to the space switching domain

- Multi-dimensional switching granularity - Channel allocation over

a. multiple Modes/Cores/fibres b. multiple spectral slots

- Optimized system bandwidth usage - Combined spectral – spatial optimization. - Multi-dimensional flexible switching

Optical Networking evolution through

relevant EU projects

The NPOT history in FP7 projects

ICT DICONET (Jan 08 – Dec 10)

• Introduction of the Impairment Aware Routing and Wavelength Assignment (IA-RWA) concept to optimize WDM network planning according to physical layer performance • Development of the first performance evaluation tool (Q-Tool) to provide estimation on the

physical layer performance

ICT CHRON (Jul 10 – Sep 13)

• Introduction of the cognition concept in order to speed up the decision process based on previous network states

• Inclusion of advanced signal transmission formats based on coherent detection and uncompensated transmission

• Inclusion of basic flexible optical networking concepts considering mixed line rate signals being co-propagated

• Updated Q-Tool for coherent formats achieving ultra-fast processing based on analytical equations

ICT INSPACE (Feb 14 – Jan 17)

• Extension of the network planning concept to include the space dimension in addition to wavelength and signal bandwidth

• Compatibility with the SDN approach for the path computation

9 _{www.ait.edu.gr}

A view on the first DICONET NPOT

Network Planning & Operation Tool (NPOT)

Planning Mode Modules

TCP (Standard socket interface)

NPOT XML Parser

http://www.saunalahti.fi/~samiuus/toni/xmlproc/

NPOT_PPD_TED_Manager

(Network Description in Memory) “C Data structures” NPOT_QTool

NPOT (Messaging protoocl) NPOT

Online IA-RWA

(Centralized & Distributed)

NPOT Failure Localization NPOT Offline IA-RWA NPOT Regenerator Placement NPOT Monitor Placement 1 2 3 4 5 6 7 Q(s) LP(s) Q(s) LP(s) Q(s) LP(s) Q(s) LP(s) Q(s) LP(s) Qtool_C

(Shared library generated from Qtool_C.m ‘MATLAB’ version)

Network Description (Physical + Topology)

Generator

(XML Generator as a MATLAB Utility)

TopologyTXT

(Line format: Ln Ns-Nd Dxx YY ZZ …)

Parameters

(AmpNsp, W, pinDCF, pinFiber, Channel spasing, …)

MATLAB Component Runtime Library (MATLAB Component Compiler) mcc -B csharedlib:libqtoolc -C -v Qtool_c.m

libqtoolc.so

Command Line Interface (CLI) [Standalone NPOT]

Network Description (Physical specifications + Topology) PPD.XML

PNodes, Amplifiers, Attenuators, Regenerators, Fibers, Transmitters,

Receivers, Physical links

TED.XML Nodes, Topology

•Network Description (Physical specifications and Topology)

•TED (Traffic Engineering Database), PPD (Physical Parameter Database) •Expressed in XML format

•XML Generator as a MATLAB Utility

•XML Parser to import the network

description into “C” data structures

•Stored in Memory (RAM) •PPD & TED Manager module •Physical Layer Performance Evaluator

•AIT’s Q-Tool

•Planning mode modules •Offline IA-RWA

•Regenerator placement (COR2P) •Monitor Placement (M-Trials)

•Operation mode modules:

•Online IA-RWA (Centralized, Distributed) •Failure localization (M-Trials)

•Command Line Interface (CLI) •Planning mode

http://www.ict-chron.eu

11 _{www.ait.edu.gr}

Physical Layer

Moving towards the INSPACE NPOT

Spatial allocation of VN segments

Incorporating the space dim-ension in network planning

More optimization

options in terms of:

- Link capacity - Cost (Capex-Opex) - Energy efficiency

Hitless spectral

defragmentation using

the space domain

Support of “actual”

network virtualization

with spatial separation virtual network segment

More routing and channel allocation options

NPO

13 _{www.ait.edu.gr}

Exploiting the NPOT capabilities



NPOT as a network planning simulator

• Network mapping including node and transport characteristics

• Inclusion of different traffic demand generation options

• Inclusion of performance evaluation model (Q-Tool) that can be

customized according to the actual Tx/Rx characteristics

• Different options for network resource optimization (cost, energy,

utilization, etc.)



NPOT as an online optimization tool

• Real time processing of demands and dynamic update/optimization of

resources.

• Requires a) fast processing and b) interfacing with control

Analytical performance evaluation expressions and use of cognition can significantly reduce the processing time (especially if accompanied by hardware acceleration), <1ms

Interfacing with actual hardware solutions



Targeted market

Remarks and future plans



NPOT is built as an efficient tool to provide the planning of network

resources in real time and according to traffic demands and taking into

account the physical layer transmission performance.



A powerful tool that is required by large network operators in order to

optimize the network resources i.e.:

• Maximize the spectral (and spatial) utilization

• Reduce the overall network cost and energy consumption

• Enable optimized sharing of the infrastructure among different operators



NPOT is an evolving work that follows the latest networking trends



It starts making real sense as the network complexity in terms of resource

management increases



An interesting upgrade of NPOT is to consider the type of applications that

request transport over a flexible optical layer

 … this is an application aware NPOT !!!

15 _{www.ait.edu.gr}

Thank You !

Acknowledgments:

 The former AIT colleagues working on DICONET and CHRON projects:

 Siamak Azodolmolky, Marianna Angelou, Ynan Poiturier, Eleni Palkopoulou, Ioannis Stiakogiannakis

 The

project partners

 The

project partners