Post on 30-Dec-2016
Explaining Where Ethernet FitsInto the Mobile Operator’sNetwork Evolution Plans
IIR Transport Networks for Mobile Operators
The Pseudo-Wire Company®
Amsterdam, May 2008
2 - © 2008 Axerra Networks®. All rights reserved.
Mobile Backhaul - Key Market Trends Enhanced user-experience demands
higher-speed data rates– HSDPA – the “killer application” for
mobile backhaul – Flat rate 4G technology (WiMAX and LTE)
standardization is in the final stage ofapproval process
– Will take 3-4 years till mass deployment– Many operators will use PW as IP solution
till LTE availability in order to skip one hardware upgrade phase
Access is definitely the bandwidth bottleneck– PDH/TDM is not a scalable solution
Backhaul networks migrating to Ethernet– The mobile RAN is migrating from
TDM and ATM to IP/ETH All IP RAN evolution will happen
gradually and not in one step– 2G/3G Base Stations will co-exist for
a long time with 3G taking over gradually– Base Stations with TDM/ATM I/Fs
will stay for at last 3~5 years
Source: Heavy Reading, Ethernet BackhaulQuarterly Market Tracker, November 2007
3 - © 2008 Axerra Networks®. All rights reserved.
Typical 2G/3G RAN Backhaul Architecture
Both, 2G TDM and 3G ATM traffic are backhauled over TDM leased lines
Radio Access Network
Leased lines for backhaul accounts today 40%-60%of Mobile Operators Operational Expenses (OpEx)
BTS
NodeB
Abis
E1
RNC
Iu
ATM/IMA, n x E1
BSC
A
ATMSwitch
STM-1 ATM
PDH/SDHTDM Leased Lines
DXCE1/
ChSTM-1
E1/ ChSTM-1
E1/ ChSTM-1
Iub
Abis
Iub
4 - © 2008 Axerra Networks®. All rights reserved.
Global Market Dynamics – Cell Site GrowthSource: Infonetics ResearchMobile Backhaul Equipment,Installed Base & Services, March 2007
Worldwide Mobile Backhaul Connections: Installed vs New
0
1,000
2,000
3,000
4,000
5,000
CY05 CY06 CY07 CY08 CY09 CY10
Calendar Year
Con
nect
ions
(K)
New connections
Installed connections
Installed Worldwide Cell Site connections will grow from 2.9M in 2006to 4.8M in 2010
– The vast majority of today Installed Cells are T1/E1 based– Many of the Cells can’t be upgraded to Ethernet
Ethernet to the Cell Site will be required in order to support future NodeB Many want pseudowire to support 2G BTS and NodeB cell sites (and site with
collocated 2G/3G) Increased pressures to use Ethernet for all traffic from a cell site
5 - © 2008 Axerra Networks®. All rights reserved.
TDM Backhaul Hits the Breaking-Point Ethernet Solutions for Cell Backhaul
Source: Heavy Reading (11/2007) – A large European mobile operator
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3G is great, but what is next? Ethernet Solutions for Cell Backhaul is driven by WCDMA/HSPA Evolution
WiMAX and 4G (LTE) technologies standardization coming soon Continuous Improvement of Data Capabilities
– T1/E1 will not scale, Ethernet is the only solution Ethernet will be supported in latest releases of NodeB
– During this year new NodeB will support Ethernet– This will increase the demand for Ethernet to the cell site
7 - © 2008 Axerra Networks®. All rights reserved.
Ethernet is the Accepted Solution Ethernet Solutions for Cell Backhaul
Ethernet Backhaul will become available before Ethernet RBS– This gap will force the early use of Pseudo-Wire technology– Pseudo-Wire will stay in the cell in order to support Hybrid cells
8 - © 2008 Axerra Networks®. All rights reserved.
Migrating to Ethernet Transport - MEF Use Cases
Hybrid RAN/HSDPA Offload -Enables phased migration to
Ethernet while:Utilizing low cost and available
broadband technology fortransport HSDPA traffic
Packet offload over Carrier Ethernet (HSDPA offload) Overlay MEN does bandwidth offloading onto Ethernet services Legacy network continues to transport voice and deliver timing/signaling Voice services are migrated onto Ethernet in a second phase
Emulation over Carrier Ethernet (legacy services over Ethernet) RAN nodes with legacy interfaces transport all traffic over Ethernet services using
emulation technologies – from Day 1
“Big Bang”
9 - © 2008 Axerra Networks®. All rights reserved.
Multiple Services Over PSN with PWE3 Solution Examining the application of Ethernet to GSM, GPRS, UMTS & HSPDA/HSUPA
Service Supported Service Cell Site Interface MSC Interface Benefit
CES Pseudowire AMPS, GSM, CDMA TDM: T1/E1, DS3/E3, OC3/STM-1
TDM: T1/E1, DS3/E3, OC3/STM-1,
B/W gains from DS0 grooming
ATM Pseudowire UMTS, HSDPA ATM & ATM IMA: T1/E1, DS3/E3, OC3/STM-1
ATM: T1/E1, DS3/E3, OC3/STM-1
Stat-mux gainsNo ATM switch needed in CO
HDLC Pseudowire 1xRTT, EV-DO, Abis HDLC: T1/E1, DS3/E3 HDLC: T1/E1,
DS3/E3, OC3/STM-1
Stat-mux gainsHDLC data interface
FR Pseudowire iDEN FR: T1/E1, DS3/E3 FR: T1/E1, DS3/E3, OC3/STM-1
Stat-mux gainsFR data interface
Ethernet Pseudowireswitching
EV-DO, WiMax, 4G Ethernet: FE Ethernet: GigENo TDM interfaces needed on CO router
WiMAX/LTE
EVDO
3G
2G
MultiprotocolPseudowires
GigE
TDM
ATM
RNC
RNC
BSCMSCCell Site
Pseudowire Tunnel
Ethernet
Service
CES T1/E1
ATM IMAnx E1/T1
Ethernet
Ethernet
PWE3Access Device
PWE3Gateway
10 - © 2008 Axerra Networks®. All rights reserved.
Traffic Differentiation and QoS with PWE3 Mobile Backhaul
Three level of Priorities are required as minimal– Priority 1 for Voice and Management– Priority 2 for R99 3G Data– Priority 3 for HSPA/HSUPA– Priority 4 might be needed for HSDPA (Best Effort Service)
11 - © 2008 Axerra Networks®. All rights reserved.
Pseudo-Wire – the Packet-based RAN Migration Enabler
For the next few years the vast majority of cell site connections will be based on T1/E1 interfaces
About 1/3 of overall cell sites are collocated 2G/3G sites Growing demand for Ethernet connectivity to high capacity cell sites
– The amount of bandwidth per cell site is estimated to grow by 3x to 4x over time – New 3G and 4G NodeB will use Ethernet interfaces
Most additions of 3G cell sites will take place in existing 2G cell sites– Operators use existing foot print of 2G cell sites
All traffic originating from Hybrid cell site will be carried over Ethernet using PWE3 gear
Use PWE3 gear to servecollocated 2G/3G sites
Use PWE3 gear withadvanced functionality
(Ethernet Link/Services OA&M and PM)
PWE3 CPE will become anEthernet Demarcation Device
12 - © 2008 Axerra Networks®. All rights reserved.
Widespread Consensus on the need for Pseudo-Wires
Major operators are deploying PW solutions at the cell site and it playsan important role in the evolution of mobile backhaul networksto IP/Ethernet
– T-Mobile, Telecom Italia, Swisscom, Taiwan Mobile and eMobile (Japan) are just few operators that announce PW deployment in 2007
– For many carriers Pseudo-Wire is not a question of “if” any more but a question of “where?” and “when?”
BTSBSC
Carrier EthernetRAN
Emulated TDM/ ATM/HDLC PW Service
ETHETH
TDME1
IPETH
R5/4G/ WiMax
PWE3 Cell Site Device PWE3
GatewayG.823/824 Compliant Clock
ATM RNC R99
RNC R5
ATM/IMA
NodeB
13 - © 2008 Axerra Networks®. All rights reserved.
Different Design Topologies For Pseudo-Wire in the RAN
(1) Stand-alone Pseudowires in the RAN
(2) Integrated Pseudowires in the RAN
RNC
ETH
PWE3 Access Device
Iub
OC-3 ATM
PWE3 Gateway T1/Ch OC-3
AbisETH
Iub - ATM PseudowireAbis - CES Pseudowire
PSN Tunnel
BSCT1/E1
IMA
ETH
PWE3 blade
ETH
Carrier Ethernet/
MPLS ETH
Iub - ATM PseudowireAbis - CES Pseudowire
PSN Tunnel
Both integrated RAN and stand-alone PWE solutions are valid and will be deployed in volume during the next few years
The market will be dominated by stand-alone solutions through 2008
14 - © 2008 Axerra Networks®. All rights reserved.
Ethernet demarcation features enables:– End to End Service Level Assurance
–Ethernet QoS– Investment protection
–PWE3 CPE of today will evolve to Ethernet Demarcation device– Lower total cost of ownership
–Fewer boxes in the Cell Tower
PW OAM
UNI
PWE3Gateway
PWE3CPE
Ethernet Service OAM802.1ag
CECE PE
UNIAC AC
PEPSN Tunnel
Eth Link OAM802.3ah
Eth Link OAM802.3.ah
Subscriber Interface
OAM
Network Interface OAM Subscriber
Interface OAM
Network Interface OAM
Ethernet Link OA&M: Discovery,Link Monitoring, Remote Failure Indication,and Loopback
PWE3 CPE will become an Ethernet Demarcation DeviceMonitoring SLA Over 3rd Party Transport Networks
15 - © 2008 Axerra Networks®. All rights reserved.
Mobile Backhaul over Ethernet Case StudyHSPA Mobile Backhaul – Tier 1 Mobile operator in Japan
HSPA data traffic runs over Ethernet network – 3rd party Ethernet network is used– Clock recovery over Packet is supported – Fast, easy deployment with perfect migration to Carrier Ethernet– Hundreds of cells already deployed
Ethernet Network
RNC
NodeB
STM-1 ATM
AXN800 NodeB
Iub
STM1 ATM
GigE
AXN10-A55
AXN10-A55
Emulated ATM circuits
HPCR Clock Transmission
FE
FE
STM1 ATM
Iub
16 - © 2008 Axerra Networks®. All rights reserved.
Mobile Backhaul over Ethernet Case Study Taiwan Mobile - GSM/UMTS Backhaul over PSN
Use of Pseudo-Wire technology for TDM (2G) and ATM (3G) Circuit and Service emulation over Carrier Ethernet
– Support HSDPA and HSUPA No changes to the existing RAN infrastructure Clock architecture not changed Future-proof investment, including ability to add IP/Ethernet in the Cell
3G RNC
2G BSC
Metro Ethernet from 3rd party SP
PWE3 GW
Abis
NMS
GigE with LAG
FE
FE
Emulated TDM and ATM Circuits
Ethernet LL
Wireline / MSO DomainPWE3 CPE
OC3/STM-1ATM (Iub)
CH OC3/STM-1or T1/E1
2G BTS
T1/E1 TDM(Abis)
1xT1/E1 ATM(Iub)
3G NodeB
2G BTS
T1/E1 TDM(Abis)
1xT1/E1 ATM(Iub)
3G NodeB
17 - © 2008 Axerra Networks®. All rights reserved.
Conclusions Migration to IP/MPLS backhaul networks is inevitable
– Drivers are RAN capacity growth, IP base stations, and service evolution Immediate OpEx savings and short ROI
– Carriers will deploy Ethernet for 3G and 4G backhaul to realize significant cost advantages and close the gap between mobile revenue and expense
– Pseudo-Wire allows OpEx saving with minimal CapEx investment by skipping some upgrades on the way to LTE
Investment protection– Shifting to Ethernet Assurance and other added value features…
RAN Evolution versus Revolution– 2G/3G Base Stations are collocated and will co-exist for a long time
with 3G taking over gradually– Migration to All IP RAN will happen gradually and not in one step
PW Mobile Backhaul solutions are picking up, becoming mainstream– Pseudo-Wire is the Packet-based RAN Migration Enabler– Field proven with large deployment over ANY packet transport network
PW Mobile Backhaul Solutions Available Today..for 2G, 3G, and Beyond
The Pseudo-Wire Company®
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