Download - LTE E2E Presentacion Part1
Long Term Evolution (LTE)Long Term Evolution (LTE)Long Term Evolution (LTE)Long Term Evolution (LTE)
End to End Overview End to End Overview End to End Overview End to End Overview
30th August, 2012
Award Solutions Confidential and Proprietary
30th August, 2012
Stellan Ohrn, Lauro Ortigoza
[email protected]@awardsolutions.com
Award Solutions, Inc.www.awardsolutions.com
Introduction to 3GPP
Award Solutions Confidential and Proprietary
Introduction to 3GPP
Systems
R8
3GPP Roadmap
R6
R7
R9
R10
Circuit voice,
2 Mbps
packet data
Bearer-independent
circuit-switched
architecture
HSDPA,
IMS
HSUPA,
MBMS
HSPA+, Higher-order
modulation, MIMO
LTE
Award Solutions Confidential and Proprietary
R99
R4
R5
LTE
Enhancements
LTE-Advanced
LTE Requirements
A. Peak data rates
1. > 100 Mbps (downlink)
2. > 50 Mbps (uplink)
B. Latency
1. < 10 ms (user plane)
2. < 100 ms (idle to active)
��
��
Award Solutions Confidential and Proprietary
C. General goals
1. Better spectral efficiency
2. Lower costs
3. Interworking with 3G and
other 4G systems
4. Seamless mobility
�
��
�
�
4G Networks
Spectrally efficient
air interface
• OFDMA
• Multiple antenna
techniques
Distributed, IP-based
access network
• Scalable
• Reduced latency
IP-oriented, IMS-based
core network
• Scalable
• Low cost
• Rapid service deployment
Award Solutions Confidential and Proprietary
Air Interface Access Network Core Network Service Network
LTE Architecture
Award Solutions Confidential and Proprietary
LTE Architecture
Network Architecture Evolution3G
HLRRAN
CircuitCore
Packet
CoreIP Network
PSTN
T1 backhaul
Award Solutions Confidential and Proprietary
LTE HSS
Packet
Core
RAN
IP Network
IMS
PSTN
Services
Fiber/Ethernet
backhaul
LTE Radio Network
MME
E-UTRAN
• No centralized
controller (RNC)
• eNode Bs linked
via X2 interface
E-UTRAN
eNB
S1S1S1S1----MMEMMEMMEMME
Award Solutions Confidential and Proprietary
S-GW
E-UTRAN
UE eNB
X2X2X2X2
UuUuUuUu
S1S1S1S1----UUUU
EPC
EPC Architecture - I
HSSMME
• Master database
• Subscription data
• Security information
• Idle-mode mobility management
• Bearer establishment
• S-GW and P-GW selection
PCRF
Award Solutions Confidential and Proprietary
EPCMME
S-GW
P-GW
ePDGOperator
Services
Wi-Fi 1xEV-DO
E-UTRAN
EPCHSS
MMEP-GW
EPC Architecture - II
Security gateway
PCRF
Policy and charging
rules function
Award Solutions Confidential and Proprietary
S-GWePDG
Operator
Services
Wi-Fi 1xEV-DO
E-UTRAN
• Packet data routing
• Mobility anchor
• Idle-mode packet
buffering
• Lawful intercept
• Packet filtering
• QoS enforcement
• Default gateway
• Charging
• Lawful intercept
LTE Device Capabilities
1 NoneQPSK
16QAM 5 Mbps
QPSK
16QAM
64QAM10 Mbps
2 Up to 2x2QPSK
16QAM 25 Mbps
QPSK
16QAM
64QAM51 Mbps
Category MIMO Modulation
UL DL
Data Rates
UL DL
Award Solutions Confidential and Proprietary
3 Up to 2x2QPSK
16QAM 51 Mbps
QPSK
16QAM
64QAM100 Mbps
4 Up to 2x2QPSK
16QAM 51 Mbps
QPSK
16QAM
64QAM150 Mbps
5 Up to 4x4
QPSK
16QAM
64QAM75 Mbps
QPSK
16QAM
64QAM300 Mbps
OFDM and MIMO
Award Solutions Confidential and Proprietary
OFDM and MIMO
Why OFDM?
Scalable Design – Up to 20 MHz
Higher Data
Rates
Award Solutions Confidential and Proprietary
Support for
Advanced
Antenna
Techniques
Rates
Reduced
Interference
Time and
Frequency
Domain
Scheduling
Simplified View of OFDM
10
Mbps
Large flow
of water
High-speed
data flow
Award Solutions Confidential and Proprietary
100 kbps
100 kbps
100 kbps
100 kbps
100 kbps
OFDMA
Many small
streams
Many low-
speed data
streams
OFDM in a NutshellMulticarrier
OFDM
saved bandwidth
Guard band
Award Solutions Confidential and Proprietary
• FDM transmission (number of narrow band
overlapping carriers)
• Orthogonal carriers to avoid interference
no interference
LTE Design ParametersBandwidthBandwidthBandwidthBandwidth
20 MHz
15 MHz
10 MHz
5 MHz
3
1.4
Subcarrier SpacingSubcarrier SpacingSubcarrier SpacingSubcarrier Spacing
15 kHz
AntennasAntennasAntennasAntennas
Up to 4x4 MIMO
Frame TimingFrame TimingFrame TimingFrame Timing Cyclic PrefixCyclic PrefixCyclic PrefixCyclic Prefix5.2 or 4.69 µs
DuplexingDuplexingDuplexingDuplexing
FDD
Award Solutions Confidential and Proprietary
n-1 n n+1
10 ms
CP Symbol
CP Symbol
16.67 µs
NormalNormalNormalNormal
ExtendedExtendedExtendedExtended
66.67 µs
H-FDD
TDD
CodingCodingCodingCoding
Convolutional Turbo
0101
000111000111
0101
100110001011
ModulationModulationModulationModulation
QPSK 16-QAM 64-QAM
Multiple AccessMultiple AccessMultiple AccessMultiple Access
OFDMA
SC-FDMA
Multiple Antennas in LTE
TypeTypeTypeType How How How How BenefitsBenefitsBenefitsBenefits
Transmit DiversityIdentical streams to the
same user
Better coverage and/or
quality under
challenging radio
conditions
Spatial Multiplexing
Award Solutions Confidential and Proprietary
Spatial Multiplexing
(Single User-MIMO)Multiple streams to the
same user
Higher throughput for
receivers in good
conditions
Multi-User-MIMO
Different streams to
different users
Greater cell capacity
Type 1 Frame Structure (FDD & H-FDD)
Frame n-1 Frame n Frame n+1
SF 1 SF 2 SF 3 SF 10
TSF= 1 ms
TF =10 ms
Award Solutions Confidential and Proprietary
SF 1 SF 2 SF 3 SF 10
Ts0 Ts1 Ts2 Ts3 Ts4 Ts5 Ts18 Ts19
TSLOT= 0.5ms • Resource allocation done per sub-frame
• Slots are used in cell synchronization
• Frames used in SIB scheduling
Downlink Transmission Parameters
Transmission BW 1.4MHz 3MHz 5MHz 10MHz 15MHz 20MHz
Sub-frame duration 1 ms
Sub-carrier spacing 15 kHz
Sampling frequency 1.92 MHz 3.84 MHz7.68 15.36 23.04 30.72
Award Solutions Confidential and Proprietary
Sampling frequency 1.92 MHz 3.84 MHz7.68
MHz
15.36
MHz
23.04
MHz
30.72
MHz
FFT size 128 256 512 1024 1536 2048
Number of occupied
sub-carriers with DC76 151 301 601 901 1301
Resource Blocks6 12 25 50 75 100
Number of OFDM
symbols per slot
(Normal or Extended CP)7 or 6
Services in LTE
Award Solutions Confidential and Proprietary
Services in LTE
EPS Bearer Service Architecture
UE eNB S-GW P-GW Peer
Entity
E-UTRAN EPC Internet
End-to-End Service
EPS Bearer External Bearer
Award Solutions Confidential and Proprietary
EPS Bearer External Bearer
E-RAB S5/S8
BearerRadio Bearer S1 Bearer
Radio S1 S5/S8 G1
QoS Classes in EPS
QCIQCIQCIQCIBearerBearerBearerBearer
TypeTypeTypeTypePriorityPriorityPriorityPriority Application ExampleApplication ExampleApplication ExampleApplication Example
1111
GBR
2 Conversational voice
2222 4 Conversational video (live streaming)
3333 3 Real-time gaming
Non-conversational video (buffered
Award Solutions Confidential and Proprietary
4444 5Non-conversational video (buffered
streaming)
5555
Non-GBR
1 IMS signaling
6666 6Video (buffered streaming), TCP apps (web,
email, FTP), premium service
7777 7 Voice, video, interactive games
8888 8 Video (buffered streaming), TCP apps (web,
email, FTP,) non-premium service9999 9
REF: 3GPP TS 23.203
EPS Bearers
Award Solutions Confidential and Proprietary
EPS Bearers
IMS
EPS Bearers
Default EPS Bearer
Dedicated EPS Bearer P-GW 1
Best effort, “always on”
connection
Award Solutions Confidential and Proprietary
Internet
UE
Dedicated EPS Bearer
Default EPS Bearer
P-GW 1
P-GW 2
QoS requirements based
on service request
UE can have connections
to multiple PDNs
Service Data Flows
IMS
IMS Signaling (Default)
VoIP Traffic (Dedicated) P-GW 1
SDFs with different QoS
requirements are carried in
separate EPS bearers
An SDF represents one
end-to-end packet flow
Award Solutions Confidential and Proprietary
Intern
et
UE
VoIP Traffic (Dedicated) P-GW 1
Email (Default)
Web browsing (Default)
P-GW 2
SDFs with the same QoS
characteristics can be aggregated
Signaling Bearers
Established during RRC
Connection set upEstablished during
initial Network Attach
Award Solutions Confidential and Proprietary
eNBUE MME S-GW P-GW
RRC S1-MME S11 S5/S8
Established during
initial Network Attach
Established for every
PDN connection