Light Reading Mobile 2012 VTS LTE Backhaul Panel FINAL

8/8/2019 Light Reading Mobile 2012 VTS LTE Backhaul Panel FINAL

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LTE Backhaul:New Architectures for All-IP

Thursday, June 11, 2009

Moderated by

Patrick DoneganSenior Analyst

Virtual Tradeshow


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Our Panelists

Ran Avital, VP Marketing, Ceragon

Ralph Santitoro,Director of Carrier

Ethernet Market Development, FujitsuNetwork Communications

Eitan Schwartz, VP Pseudowire & EthernetAccess, RAD Data Communications


3/24

IP

Voice Core(MSC)

3G W-CDMA Architecture

4G LTE Architecture

Data Core(SGSN/GGSN)

EvolvedPacketCoreS1 interface

X2

interface

Iub interface

IuPS interface

Iu CS interface

Iub interface

S1 interface

ATM/IP

ATM/IP

IP


4/24

LTE is the first genuinely all-IP

wireless standard. It requires IP/MPLS

routing in every node in the network,including throughout the backhaul.

The statement below should be considered as a debating point not as an opinion ofHeavy Reading.


5/24

Technology OptionsFor Connection-Oriented Ethernet (COE)Significant Differences Among Number of Layers to Manage

IP/MPLS

(3) Data Plane Layers

1)Ethernet2)Pseudowire (PW)3)LSP

VLAN TagVLAN TagSwitchingSwitching

Routed Non-Routed

StaticPW/MPLS

T-MPLS

(1) Data Plane Layer

Ethernet

MPLS-TP PBBPBB--TETE

PW

MPLS-TPLSP

PWEth Eth

BFD, Protection ProtocolBFD, VCCV

802.1ag, 802.3ah, Y.1731

MPLS-TP-based COE

IP/MPLS-Based COE

PW

MPLS LSP

Eth Eth

BFD, RSVP-TE/LDP, FRR

802.1ag, 802.3ah, Y.1731

IS-IS, OSPF, BGP, IP addressing, BFD

PW

T-LDP/BFD, VCCV

SS--VLAN orPBBVLAN orPBB--TE TunnelTE Tunnel

EthEth EthEth

G.8031, 802.1ag, 802.3ah, Y.1731G.8031, 802.1ag, 802.3ah, Y.1731

EthernetEthernet--based COEbased COE

Ethernet

(3) Data Plane Layers

1)Ethernet2)Pseudowire (PW)3)LSP

(1) Control Plane Layer IP

Ethernet+PW+LSPEthernet+PW+LSP

Ethernet-based COE simplifies OAM&POnly 1 Layer to manage: Ethernet


6/24

The X2 interface between

eNode Bs will only support a little

bit of cell handover traffic initially it probably wont be used

for anything more than that.



7/24

Proposed LTE Architecture Example 3

Backhaul for LTE EVPL for S1 interface

E-LAN for X2 interface

CarrierEthernetAggregation Network

UNI UNIRAN BS RAN NC

CarrierEthernet

Access NetworkENNI

RAN BS

UNI

CarrierEthernet

Access Network

ENNI

RAN BS

EVPL 1EVPL 2EVPL 3EVPLAN


8/24

Most integrated fixed and wireless carrierswill implement an L3-based backhaul for

LTE because they already have the L3

engineering skill-sets

Most pure-play wireless operators and

wholesale backhaul providers will implement

an L2 backhaul network because they dont.

The statements below should be considered as a debating point not as an opinion ofHeavy Reading.


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Wholesale backhaul providers typically preferL2: Simpler to provision

Scalable BW pipes for unpredictable needs

Strong Ethernet OAM mechanisms offer SLA

Sub 50ms failover with 802.3ad and G.8032

Pseudowire helps support 2G/3G services, in addition to LTE Powerful diagnostic tools

Pure-Play wireless operators typically preferL2: Simple / automatic provisioning

Ethernet circuit validation, PM, fault detection and analysis

Traffic engineering oversubscribe link bandwidth Integrated carriers may preferL3 (skill sets)

Mesh, alternate routing, but less developed OAM

L2/L3 Backhaul Challenges


10/24

Audience Poll

As LTE is an all-IP network, it will requirerouting at every node in the network,

including all the backhaul nodes.

To what extent do you agree or disagree?

Strongly agree

Somewhat agree

Neither agree nor disagree Somewhat disagree

Strongly disagree


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Multi-Generation Backhaul

Transporting legacy 2G and 3G cellular trafficover the existing TDM network whileLTE is transported over a separate

packet backhaul is optimal.

Better that than trying to emulate2G and 3Gover a single packet backhaul for all

generations of cellular traffic.



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Evolution From SonetTo Packet-Based Ethernet MBH

FMO Step 1:Add COE over Sonet to

increase bandwidthefficiency

PMO:Sonet

Sonet

FMO Step 2:

Begin Migration to EoF packetnetwork.

Existing services unaffected

DS1s Ethernet

Packet-optical networking platform with COE facilitatesMBH network migration of multi-generation 2G/3G/LTE services

EoS

MSPP

TDM

Sonet

DS1s Ethernet

COETDM

Sonet

DS1s Ethernet

COETDM

EoF

PacketOptical

Networking

PacketOptical

Networking

2G/3G 2G/3G LTE 2G/3G 3G/LTE


13/24

There is a big difference

between backhaul equipment

being Ethernet-readyand being LTE-ready.



14/24

LTE Backhaul Requirements(and the radio perspective)

Requirements Details

High Capacities 50-200 Mbit/s per site

Peak rate & average 173 Mbit/s vs. 35 Mbit/s

Low latency


15/24

The differences in synchronization

requirements between

3G and LTE are academic.

This is because most operators are goingto leave a T1/E1 at the cell site for

packet backhaul synchronization

rather than adopt a new standard,none of which is mature yet.



16/24

Multi-G r ti ul itMulti l r i ti O ti

TDM

ATM IMA

TDM

ATM

2G BSC

3G RNCETH

SHDSL

ATM IMA

IP-DSLAM

Physical-layer Sync

E1/T1 TDM link

Sync-Ethernet (G.8262)

NTR DSL/GPON

TDM link

Adaptive /

IEEE 1588-2008

Sync-E

NTR

FE/GbE

IP Node B

ETH

S1 (ETH)

aGW

Node B

eNode B

E1/T1

E1/T1

Packet-based Sync

Adaptive

1588-2008

NTP

Sync-E


17/24

LTEs All-IP architecture will leave thebackhaul open to security attacks on

a far greater scale than ever before.

A lot of operators havent thought the

implications through nearly well enough.



18/24

Security With Connection-OrientedEthernet

COEuses few protocols. IP & MPLS require many

The more protocols used, MBH network is more susceptible to attacks

Management VLANs isolated from user traffic

Similar to DCC isolation from user traffic in Sonet networks

COE has many security advantages overbridged solutions COE disables MAC address learning / flooding

MAC address spoofing cannot occur

MAC table overflow DOS attacks cannot occur

COE disables vulnerable Layer 2 control protocols (L2CPs)

Protocol-based DOS attacks cannot occur

COE is immune to IP-based attacks & popular L2-based attacks


19/24

With any new technology, its alwaysthe OAM that gets left till last, and

IP/Ethernet backhaul is no different.

The OAM standards are not mature,

particularly as regards integration

with legacy TDM OAM systems.



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Ring site#3

Fiber site

RNC

Ring site#2

Wireless

CarrierEthernet

Ring

Tail site #1

Tail site #2

Tail site #3

Ring site#1

Packet or TDM

based fiber

aggregation

network

or leased lines

A

B

C

Sample Scenario:

Carrier Ethernet Services in Mobile Backhaul #2

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave


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Ring site#3

Fiber site

RNC

Ring site#2

Wireless

CarrierEthernet

Ring

Tail site #1

Tail site #2

Tail site #3

Ring site#1

Packet or TDM

based fiber

aggregation

network

or leased lines

No alternate path availablefor Service A.

Service connectivity failureis reported by service end

points.

No alternate path availablefor Service A.

Service connectivity failureis reported by service end

points.

A

B

C

A

Service B is restoredusing alternate path over

the ring.No service connectivity

alarm is generated.

Service B is restoredusing alternate path over

the ring.No service connectivity

alarm is generated.

Services B & C now share thesame radio link resulting in

higher traffic load.QoS is used to provide service

differentiation for high priorityand delay sensitive traffic.

Services B & C now share thesame radio link resulting in

higher traffic load.QoS is used to provide service

differentiation for high priorityand delay sensitive traffic.

Sample Scenario:

Carrier Ethernet Services in Mobile Backhaul #3

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave

Ethernet

Microwave


23/24

The vast majority of wholesale backhaul

providers and wireless operators

will design their packet backhaul

for 2G and 3G as well as LTE.

And since 90% of wireless traffic

will be 2G and 3G through 2014,

the LTE design requirements arent

critical in todays design assumptions.



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Transport Provider

E2E SLA Monitoring and Diagnostics

EthernetAccess Ring

(50ms)4GG/W

GigE

MSCCT3/O

C3

Mobile

Operator B

Fixed

WirelessMSC

CT3/OC3

4GG/W

MobileOperator A

GigE

Test Equip.

Mobile Operator E2E T1 & Ethernet Diagnostics

Test Equip.

Data VLANs Carry BH traffic, OAM and test data.

Mgt VLAN Management and SLA statistics

NMS

Portal

Wholesale

Carrier Ethernet

MPLS

T1/E1

ETH

4G eNB

2G/3G

T1/E1

ETH

4G eNB2G/3G

T1/E1

ETH

4G eNB

2G/3G

2G/3G/4G Backhaul Services

over Ethernet/IP/MPLS

Documents

Light Reading Mobile 2012 VTS LTE Backhaul Panel FINAL