47pt design for new reliability challenges in telecomcqr2008.ieee-cqr.org/day 1/session 2/4 gong...

For 2008 IEEE CQR

47pt

www.huawei.com

Design for

new Reliability challenges

in Telecom

Gong Xuewen ([email protected]) Meng Liming ([email protected])

Huawei N.American MKT CTO office

For 2008 IEEE CQR

Reliability——No.1 concern for Telecom Carriers

According to the statistics of seven big telecom operators (including BT, AT&T, NTT, etc),

the top 3 factors effecting the network operations are reliability, availability and fault

recovery, and they are the main focusing areas in Network Reliability

Source: Telemark, 2003

For 2008 IEEE CQR

Network Reliability, More on Service and E2E Reliability

and Availability——How to measure E2E and Service

Reliability & Availability?

� Service reliability and availability

� Network reliability and availability

� Equipment reliability and availability

For 2008 IEEE CQR.

The Network comes into IP era

——How to achieve high reliability & availability

Reliable IP network ensures the delivery of user services:

� Fault detection and recovery are two main issues to reduce OPEX.

� Fault isolation (localization) is a key issue to improve NW reliability.

A complete reliability and availability analysis should consider at equipment

level, network level, as well as network service level, to correctly describe the

network reliability in different types of services.

PE3

PE4PE2

PE1 P P

PP

MPLS

Network

E2E QoS/QoE Planning and Deployment

CE CE

For 2008 IEEE CQR.

Another reliability issue for IP era

——How to optimize network reliability & availability?

SONET/SDH

layer is

eliminated

SONET/

SDH

Rings

DWDM

IP router

IP over DWDM

� How to ensure the IP over DWDM as reliable as the legacy SDH/SONET?

� How to coordinate the reliability mechanism among different layer:

Integrated reliability designs in all layers instead of just one layer?1+1<2

For 2008 IEEE CQR

Equipment and Network is changing……

How to keep meeting 5 nines?

More

commercial

chip sets

replaced by

ASICs

FGPA

NP

ASICDSP

•Hardware

becomes

more complex

•Software

overtakes

hardware

Internet 2x every 12 months

� How to make the ASICs to

be reliable as commercial

chips?

� ASIC-level reliability design

to make system more

reliable.

� New systematic reliability

architecture……

� ……

� Simple means reliable, so

how to keep 5 nines for

such complex systems?

� Fault tolerant design

� Software reliability design

� ……

For 2008 IEEE CQR.

Flatter network cause new challenges

for access nodes

Local Loop

Sub-Loop

Source: vodafone

Higher speed →→→→ small and More sites

Small and more access nodes, outdoor, pole mounted:� Reliability under rigorous environments——More reliable component , physical

reliability design

� Maintainability is the key for lower OPEX——0 touch maintenance, self-diagnose,

� Low cost design while ensure reliability

small and More nodes

For 2008 IEEE CQR.

Traditional reliability issues also has

new challenge

Energy

Saving

Lead

Free

The trade-off between energy saving and reliability?

How to ensure the reliability issue in designing for green?

source: TI Intelec 2007

For 2008 IEEE CQR.

Network Reliability Framework for Telecom

Equipment-level reliability

Network-level reliability

Service-level reliability

NE reliability with considering R&A in

Harden Environment; New Optical device;

New integrated ASICs; Lead-free; ……

User experience focused, quality of service,

rather than in 99.999%. UCD design to avoid

human error, zero-touch OAM

End-to-end network focused, different level

/ Path reliability is considered

Reliability requirement in new networks can NOT be described in a

single word “five nines”, it should include both network reliability and

service quality.

For 2008 IEEE CQR.

Some Actions for the Challenges

• We will focus on two dimensional analysis framework:

� Network layer and service layer

� Network layer Reliability Analysis

� Service layer Reliability analysis (from operator’s service view)

� E2E Network Reliability analysis

� Access networks

� CORE networks

� Transport Networks

� Application and Content networks

• We will study and develop new Reliability analysis methodology

� New service reliability requirements for new network infrastructures

� New service and network Reliability analysis methodology

� Conduct new service Reliability analysis, guide our high quality network infrastructures and solutions to meet customer service quality requirements.

For 2008 IEEE CQR

Case study：：：： China Mobile IPTN——the world’s largest and advanced NGN bearer network

SH1

GZ1

XA1

CD1

WH1

NJ1

BJ2

SH2

GZ2

XA2

CD2WH2

SY2

NJ2

BJ1 SY1

NE5000E NE5000E

SoftX3000BR BR

UMG8900

MGW GGSN SGSN MGW

ARAR AR

AR

� CMCC IPTN core network is upgraded with NE5000E, and extended to provincial/city level in whole China with CR/BR/AR layered architecture;

� The network continues positioning at the long distance soft-switching service, GPRS and signaling service as in Phase I; meanwhile also acts as the IP Bearer platform for 3G CS/PS domain, and future IMS services;

� Covers 31* provinces in China and offers service to over 200 million* subscribers.

VPN FRR + MPLS TE FRR + IGP/LDP FC

……

For 2008 IEEE CQR

Case study：：：： Field HA ability test and operation results of China Mobile IPTN

The main processor CPU utility is less than 15%, no packet loss of the

NON flapping routes

xxxxxxWhole network nodes

Results：：：：The core node HA switch over time is less than 50ms, and the whole

network convergence speed is less than 1 second.

Chengdu, Xi’an, Beijing,

Shanghai

Chengdu, Xi’an, Beijing,

Shanghai

Test Place

The switch over time is 20ms, maximum packet loss is only 1 packetxxxxxx

The switch over time is 20ms, maximum packet loss is only 1 packetxxxxxx

Test ResultTest Item

1. In the evening of 8, Aug, 2006, emulate the IPTN link/node failure, to test the online

HA ability and the impact to the networks.

2、Since deployed from 2004, the network works well in commercial operation:

� Has encountered several transmission intermittent bit error burst but NO service affected.

� On the eve of Chinese New Year, 2006, the network handled 471,000 erls of traffic within

one hour(19:00~20:00), while more than 40 million subscribers made long-distance toll

calls via it.

Thank You

www.huawei.com

47pt design for new reliability challenges in telecomcqr2008.ieee-cqr.org/day 1/session 2/4 gong...

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