Carrier Ethernet Carrier Ethernet for Mobile Operatorsfor Mobile Operators

Facilitating the Evolution to Packet Transport Networks

Peter Croy, Harris Stratex Networks

Ralph Santitoro, Turin Networks Amsterdam, 8 May 2008

Co-presented by:Co-presented by:

Ralph SantitoroMEF Chair, Web Marketing CommitteeDirector of Carrier Ethernet Solutions, Turin NetworksRalph@Marcom-Services.net

Peter CroyMEF Co-Chair, Mobile Backhaul GroupSr. Consultant, Harris Stratex Networkspeter.croy@hstx.com

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Mobile Architecture Evolution- Backhaul Network Evolution

• Driven by massive growth of lower ARPU mobile data traffic– High ARPU voice traffic still requires stringent “TDM quality” clock

synchronization and QoS.

• Evolution focused on network cost reductions through one or more of the following approaches:1. RAN backhaul bandwidth optimization over PDH

• More bandwidth over fewer PDH circuits Ethernet over PDH

2. Mobile data traffic off-load onto lower “cost per bit” packet transport network• Ethernet over HFC “cable”, xDSL, etc.• PDH/SDH network assures clock synch. for high ARPU voice traffic

3. All mobile traffic on lower ”cost per bit” Carrier Ethernet network• “Emulation” of E1/T1 PDH circuits over Ethernet• Used when majority of traffic is “packet-based”• Availability of Carrier Ethernet Network

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Mobile Backhaul Network Evolution to Carrier Ethernet

Mobile Network Evolution

Aggregation NetworkAggregation NetworkSDH SDH Carrier EthernetCarrier Ethernet

RNC

BSC

AGW

BTS

Node B

eNB

Mobile user applications evolving to IPMobile backhaul network evolving to Carrier Ethernet

PDH over µwave

Ethernet over µwaveEoPDH over µwave

Ethernet over Fibre

SDH/SONET over Fibre

PDH (E1/T1)

Ethernet over PDH

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Key Reasons for Carrier Ethernet

• OpEx savings for increasing amount of low ARPU data traffic – Economically meets ever increasing bandwidth requirements currently

constrained by cost prohibitive PDH access networks

– Simpler and lower cost to add bandwidth when compared to adding PDH circuit bandwidth

• Convergence of wireless and wireline– Enables convergence of wireline and mobile backhaul traffic over single

Carrier Ethernet multiservice transport network

• Simplifies network and service management

• Mobile traffic growth is broadband and IP centric– Carrier Ethernet is optimized for packet data traffic

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Ethernet Options Solve Backhaul Cost Problem

• PDH (E1/T1) OpEx costs increase as a step function as bandwidth increases– 2M, 4M, 6M, etc. for N x E1s

circuits• Carrier Ethernet OpEx costs

increase in smaller increments as bandwidth increases– Bandwidth can easily be added to

an Ethernet UNI– No need to add new circuits as with

PDH networks• Carrier Ethernet options satisfy

the #1 financial challenge to mobile operators:– OpEx cost savingsSource: Infonetics Research Mobile Backhaul Equipment,

Installed Base, and Services, 2007

Stay on PDH

Ethernet

Worldwide Mobile 1st Mile Backhaul Service Charges per Connection:

PDH and ATM over PDH vs. New Wireline

$37,044

$6,887

$0

$10,000

$20,000

$30,000

$40,000

CY05 CY06 CY07 CY08 CY09 CY10

Calendar Year

Rev

en

ue

PDH and ATM over PDH

New wireline

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How is Carrier Ethernet Deployed?

• Carrier Ethernet Backhaul Technologies (non-exhaustive list)– Ethernet over Fiber

– Ethernet over NG-SDH/SONET: GFP (ITU-T G.7041)

– Ethernet over Microwave

– Ethernet over PDH: MLPPP/BCP (RFC1990/RFC3518) or GFP (ITU-T G.8040)

– Ethernet over DSL (EFM): IEEE 802.3ah 2BaseTL, ITU-T G.991.2 G.SHDSL

– Ethernet over Hybrid Fiber-Coax (HFC)

• All of the above can utilize the following (non-exhaustive list):– Provider Bridges (IEEE 802.1ad)

– Provider Backbone Bridges (IEEE 802.1ah)

– Provider Backbone Bridges with TE extensions (IEEE 802.1Qay)

– MPLS Pseudowires (RFC 4448)

– Circuit Emulation over Ethernet (MEF 8)

Carrier Ethernet backhaul technology selection based on many factors including current infrastructure, mobile service mix and growth, etc.

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Legacy Transport Network

A View of Backhaul Networks Today

• Legacy = “Non-packet RAN” and “Non-packet transport”

PDH / SDH Transport Network

Legacy RAN BS Legacy RAN NC

PDH circuits

SDH circuits

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Packet off-load to Carrier Ethernet Network – Use Case 1a

• Mobile data traffic off-loaded to Carrier Ethernet Network using emulation technologies

• PDH / SDH network continues to transports voice and deliver clock synchronization

Carrier Ethernet NetworkCarrier Ethernet Network(Data traffic)(Data traffic)

GenericGenericInterworkingInterworking

FunctionFunction

GenericGenericInterworkingInterworking

FunctionFunction

UNI UNI

RAN BSRAN NC

Legacy

PDH circuits

PDH / SDH Network(Voice traffic)

SDH circuits

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Emulation over Carrier Ethernet Network – Use Case 1b

• RAN nodes with PDH interfaces– Transport all traffic over Carrier Ethernet network via

emulation technologies

GenericGenericInterworkingInterworking

FunctionFunction

GenericGenericInterworkingInterworking

FunctionFunction

Carrier Ethernet NetworkCarrier Ethernet Network(All traffic)(All traffic)

UNI UNI

RAN BS RAN NC

Legacy

PDH circuits

PDH circuits

11

RAN with PDH and Ethernet Interfaces– Use Case 2a

RAN BS RAN NC

Legacy Eth/IP

UNI UNI

Carrier Ethernet NetworkCarrier Ethernet Network(Data traffic)(Data traffic)

• RAN BS/NC equipped with Ethernet UNIs and PDH/SDH interfaces

• PDH/SDH network continues to transport voice and deliver clock synchronization

• Carrier Ethernet network for mobile data traffic off-load

PDH/SDH Network(Voice traffic)

PDH circuits

SDH circuits

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All Ethernet – Use Case 2b

• New RAN nodes with Ethernet interfaces• All traffic transported over Carrier Ethernet network

RAN BS RAN NC

Eth/IP

UNI UNI

Carrier Ethernet NetworkCarrier Ethernet Network

13

Carrier Ethernet Transport Network for Mobile Backhaul and Wireline services

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Network and Service Convergence

• Convergence of wireline and wireless transport networks for triple and quad play operators– “Network Abstraction Layer”

• End-to-end MEF service definitions

• MEF service definitions are agnostic to the transport or access network technology used to deliver them– Enables migration to hybrid networks and data off-load models

• Mobile operators require cost-effective, simple service provisioning and network operations– Base Station re-hosting to different Network Controllers based on

changes in radio coverage plan• Base stations moved to home into different BSC/RNC

– Re-hosting changes made through provisioning from NOC• Eliminates need for “truck rolls to thousands of cell sites !

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OSS Integration, OAM and Provisioning- MEF specifications integrate multiple OAM standards

• IEEE 802.3ah Link OAM – Verify first mile link connectivity

• IEEE 802.1ag Connectivity Fault Management– Verify end to end connectivity– Loopback and Link Trace

• ITU-T Y.1731– Framework for performing fault management end-to-end or at

intermediate points in the network

• MEF 10.1 Technical Specification– Defines Frame Delay, Frame Delay Variation, Frame Loss Ratio– Measure service performance for SLAs

• Ethernet OAM provides end-to-end “abstraction layer”– Network OSS integration planning– Simplified operations procedures

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Mobile Backhaul Implementation Agreement

• UNI Requirements– Ethernet OAM for Fault Management– Automated Provisioning (LMI)– Link Protection and Fault Recovery Requirements– Bandwidth Profiles

• EVC Service Requirements– CoS Requirements– Service Performance (Delay, Loss)– Connectivity Service Types– Traffic/Service Separation– Clock synchronization RAN NC

RAN BS

RAN BSCarrier Ethernet Carrier Ethernet

NetworkNetwork

UNI

UNI

UNIEVCEVC

The MEF Implementation Agreement provides guidelines for deploying Carrier Ethernet in mobile networks

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Summary

• Carrier Ethernet enables mobile operators to migrate their backhaul networks from TDM to packet transport– At their own pace driven by their individual business priorities

• Carrier Ethernet facilitates the convergence of wireline and wireless backhaul– Over a common transport network infrastructure

• The MEF’s Mobile Backhaul Implementation Agreement provides:– Guidelines for mobile operators on how to architect a service model

for Carrier Ethernet networks for mobile backhaul applications

www.MetroEthernetForum.org