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Banda larga mobile:
Evoluzione della Rete da HSPA a LTE
Ermanno Berruto
WIND Telecomunicazioni S.p.A.
Radio Days - Convegno NGN
Sasso Marconi, 20 Maggio 2010
Network Development Department
20 Maggio 2010
Mobile Broadband Network – HSPA & LTE Evolution
HSPA
3GPP R5
HSPA+
3GPP R7
3GPP R6
3GPP R8
3GPP R10+
3GPP R9
64QAM
7.2
Mbps
DownLink
21 Mbps
16QAM
16QAM
14.4 Mbps
64QAM + 2x2 MIMO +
DC-HSDPA
Multiband HSDPA 4x4
MIMO
42 Mbps
84 Mbps
168-336
2x2 MIMO or
DC-HSDPA
28 Mbps
4QAM
1.4 Mbps
64QAM + 2x2 MIMO or
DC-HSDPA
10MHz needed
16QAM
11 Mbps
5.8 Mbps
DC HSUPA
Multiband HSUPA 2x2
MIMO
23 Mbps
46-80
UpLink
LTE
LTE evolution represents a really competitive
technology respect to HSPA+ only if its
deployment is in 20MHz bandwidth.
Otherwise HSPA+ multicarrier performance
are comparable with LTE and moreover are
less expensive.
…….......................
Network Development Department
2009
DownLink
Bandwidth
UpLink
2010
2
LTE Advanced
2x2 MIMO
64QAM
4x4 MIMO
4x4 MIMO
64QAM
173Mbps
326 Mbps
1Gbps
20MHz
20MHz
>70MHz
16QAM
64QAM
64QAM
58 Mbps
2011
86 Mbps
0.5Gbps
2012
2013+
20 Maggio 2010
LTE Performance
LTE Downlink Spectral Efficiency (*)
LTE Round Trip Time (***)
RTT(ms)
180
WCDMA
HSPA
LTE
160
140
120
100
80
60
40
20
0
LTE Uplink Spectral Efficiency (**)
WCDMA
HSPA
LTE
(*) Downlink spectral efficiency shown to be 3 x
HSPA R6 (=UTRA baseline), which was the target
of LTE
(**) Uplink spectral efficiency shown to be >2 x
HSPA R6, which was the target of LTE
(***) The round trip time in UMTS/LTE is defined as
the delay of a small packet travelling from UE to a
server behind GGSN and back.
Network Development Department
3
20 Maggio 2010
LTE leverages new and wider spectrum
Source: Qualcomm
LTE relative performance decreases with bandwidth due to higher overhead; 40%
overhead in 1.4 MHz vs. 25% in 20 MHz results in 25% better relative performance in
20 MHz vs. 1.4 MHz.
Network Development Department
4
20 Maggio 2010
Similar HSPA+ and LTE performance
Network Development Department
5
20 Maggio 2010
From voice driven to data driven architectures
Source: Nokia Siemens Networks
Massive increases in data traffic can stress the existing radio access network and
backhaul infrastructure. The mobile network must be optimized to support the
dominant traffic type, moving from voice-driven to data-driven architectures, where the
cost per bit must be reduced for operators to remain profitable.
Network Development Department
6
20 Maggio 2010
LTE Spectrum Availability
LTE 900
Source: Huawei
Network Development Department
7
20 Maggio 2010
Physical limitations in Electromagnetic spectrum
Data speed and frequency are the two key parameters
deciding radio link budget. Moving high data speed services
up the spectrum is increasingly expensive with regard to
Radio Access Network.
Physical limitations make high frequencies inappropriate for
wide area coverage and technology is not able to
compensate this.
Doubling the frequency is roughly 7dB loss:
• half the cell coverage area
• 4 times more base stations required
LTE offers very efficient use of spectrum for wireless mobile
communications within one common solution. But the true
economic gain comes at lower frequencies.
Network Development Department
8
Source: Huawei
20 Maggio 2010
MW Backhauling evolution (1/2)
Phases
Standard TDM MW
R99
TDM
(Phase 1)
NodeB
E1 ATM
Voice + Data
2Mb
TDM or TDM + ATM MW
TDM+ATM
(Phase 2)
NodeB
E1 IMA
R99
HSDPA
2Mb
3.6 >> 7.2
Mb
Access and
Transport
Network
RNC
HSDPA 7,2 Mbps
TDM + Ethernet MW
R99
TDM+IP
(Phase 3)
E1
NodeB
FIBER
2Mb
HSDPA
ETH
3.6>> 7,2Mb
HSDPA 14 Mbps HSDPA+@28 Mbit/s
Ethernet MW
ALL-IP
(Phase 4)
NodeB
ETH
Voice COS
Data COS’s
> 20 Mb and
more...
FIBER
Network Development Department
9
20 Maggio 2010
MW Backhauling evolution (2/2)
Phases
TDM
(Phase 1)
TDM+ATM
(Phase 2)
TDM+IP
(Phase 3)
Network Development Department
10
20 Maggio 2010
Mobile Broadband Backhauling
• Node B interfaces are moving towards Ethernet/IP and Mobile service bandwidth requirements are increasing
([email protected], HSDPA@21, [email protected], etc…).
• 3G Mobile backhauling chains will be
mainly of two different types:
− Microwave Link: Voice (R99)
and Data (HSDPA) are
transported over a radio link (or a
tree made up of multiple radio
links) from Node B to Wind
Transmission POP. Starting from
2009 new Ethernet Microwaves
will be deploy in Wind Network
− Fibre: Voice and Data Traffic is
backhauled directly connecting
Node B to Wind Transmission
Pop by fibre.
Network Development Department
11
20 Maggio 2010
LTE Architecture
• Long Term Evolution has been frozen in R8 as first release. Commercially it is available by 1Q11 In the first release LTE
supports Data rates up to 150 Mbit/s in downlink and 50 Mbit/s in uplink (in 20MHZ bandwidth @2600MHz). Advanced
antenna schemas like TX-diversity and MIMO 2x2 are included. Handover times are short enough to support VoIP traffic.
• For LTE a new layer network has to be considered as it changes completely the access technology (new Mobile
terminals are required) and the Network Architecture: Node B evolves (eNodeB) till include all controller functionality (no
RNC element is required).
Evolved Radio Access Network
Evolved Packet Core
IP Networks
2G/3G
Other
access
SAE GW
MME
Signaling
User Traffic
eNodeB
LTE
Network Development Department
12
20 Maggio 2010
3G Direct Tunnel: first step towards LTE/SAE introduction
•
Benefits
•
Fully standard solution included in 3GPP R7 specs
•
Off-load SGSN from 3G user plane traffic
•
Facilitate handling of the user plane traffic in the core network, creating a tunnel directly
from RNC and GGSN, involving the SGSN just in the control plane
•
The right timing for 3GDT implementation depends mainly on the traffic load in the
network and the existing capacity
3G Direct Tunnel
(3GPP R7)
Dual Access SGSN
GGSN
RNC
3G
Network Development Department
‘GGSN’
GGSN
SGSN
2G
LTE
(3GPP R8)
‘SGSN’
SGSN
2G
RNC
3G
2G
RNC
LTE
3G
13
20 Maggio 2010
LTE/SAE Support in Mobile Packet Core
•
Mobility Management Entity involved just in signaling plane allows independent UP/CP
scalability, more flexible topology
•
It was expected to be co-located in the current SGSN, as a software upgrade only
•
A flat system architecture with one generic SAE GW node, again just a software upgrade
of existing GGSN, supporting all access technologies
•
LTE is a packet only access, no CS: IMS is used to provide voice service
Network Development Department
14
20 Maggio 2010
From Standards to Success
Around 6-7 years from Standards Publication to around 50 M Subs for Successful Wireless
Standards
Network Development Department
15
20 Maggio 2010
LTE Mobile Broadband Forecast
Source : September 4, 2009 - Jim O’Neill - Fierce Wireless Europe.
Asia will dominate LTE by 2016
Worldwide LTE mobile broadband
users by 2017
According to a new report (07-09-2009) from Juniper Research, the number of Long Term Evolution (LTE)
subscribers is expected to exceed 100 million by 2014, a number buoyed by embedded devices such as MP3
players, netbooks and digital cameras.
Network Development Department
16
20 Maggio 2010
Global 3G Subscription Forecast - 2014
Source: Informa Telecom & Media Forecast Summary, 4Q2009
Network Development Department
17
20 Maggio 2010
Thank you!
Network Development Department
18
20 Maggio 2010