LTE Advanced eNB Small Cell System Design Challenges Network
Transcript of LTE Advanced eNB Small Cell System Design Challenges Network
Joint ITU-GISFI Workshop on“Bridging the Standardization Gap: Workshop on Bridging the Standardization Gap: Workshop on
Sustainable Rural Communications”
(Bangalore, India, 17-18 December 2012)
LTE Advanced eNB Small Cell System Design Challenges Network Design Challenges, Network Topologies and Applications
Dr Venkat Rayapati,President &CEO,
SAI T h l ISAI Technology, [email protected]
Bangalore, India ,17-18 December 2012SAI Technology, Inc
Presentation Out-line
Key Drivers for the LTE TechnologyTechnologies and Network TopologiesTechnologies and Network TopologiesLTE Advanced Small Cell System DesignDesign
LTE Advanced TechnologiesLTE Small Cell System Design ChallengesLTE Research areas
3GPP Standards Technical GapsLTE Network Applications
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ppConclusion and Recommendations
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Key Drivers for the LTE Technology
K f t d i f th LTE Key factors drive for the LTE Technology
Broadband subscribers to reach 3.4 billion by 201480% of the users will be mobile basedFixed broadband growth expected to remain near staticOperators are being
Source: Verizon data published
Operators are being driven by two unique trends
Increase in smart mobile devicesVideo Applications & Social MediaVideo Applications & Social MediaData centric applications
India Mobile data growth rate >15%
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4G Networks in North America will increase data traffic 26 fold from 2010 through 2015
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Technologies and Network Topologiesfor 2G, 3G and 4G
BS BS
3G 4G R di
BS BS MobileSwitchingCenter
Leased line mobilebackbone
2G-2.5G Basestation control
Future all-IP cellular mobile backbone
3G-4G RadioAccess Node PSTN
CenterIP/PSTNgateway
ISP Network(s)
AP SwitchedEth t LAN
BluetoothPersonal Area Network
APEthernet LAN
APIEEE 802.11b,a,g,nWireless LAN 802.16
12/16/2012 4
WiMAX2-10Mbps
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LTE Advanced Small Cell Designll ll dSmall Cell Design supports two design
approaches:In-door Small Cell (Femto Cells)Out-door Small Cell (Roof-top Cells)
Ch ll h kh lMajor Challenge is the Backhaul support for the small cells
Micro-wave BackhaulOFDM Backhaul Licensed Spectrum versus UnlicensedUnlicensedCustom Licensed Spectrum versus Unlicensed
Integrated Small cell with Backhaul is Integrated Small cell with Backhaul is best option for Rural deployment
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LTE Advanced eNB Small Cell Scalable ArchitectureSca a e c ec u eFLASH32MB
SDRAM 512MB
Data Ethernet Port
Dual Core CPU – SW Partition
SerialRS232
JTAG I/F
Data (1)Ethernet Port10/100/1000
Managementh
Ethernet Port10/100/1000
(1) Redundancy
Ethernet Port10/100 Integrated SOC
( Baseband + Dual Core Processor)
SAI eNB Complete Software Radio Subsystem
DCXO support for AFCIntegrated DAC/ADC
Baseband I/Q Interface Antennas
MIMO 2x2
o p o
DAC/ADCMulti‐band:700 Mhz1900 Mhz2100 Mhz2300 MHzPower
ModuleClock Sync• IEEE 1588• GPS
SDRAM 512MB
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SAI Supports own PHY Layer (L1), L2, L3 and Applications for small cell
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LTE Advanced Small Cell DesignPhysical Requirementsys ca equ e e s
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LTE Small Cell Integrated with Backhaulac au
Integrated Small Cell for Rural Communication is
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Integrated Small Cell for Rural Communication isthe cost effective solution
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LTE Small Cell Design and Deployment Scenarioep oy e Sce a o
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LTE Advanced Technologies Impact for Small Cell Designpact o S a Ce es g
LTE Advanced Technologies:Carrier AggregationAdvanced MIMO SupportP iti i d T kiPositioning and TrackingCoMPHet NetsHet Nets
LTE Advanced technologies impact on LTE eNB Small Cell designon LTE eNB Small Cell design
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LTE Carrier Aggregation impact on the Small Cell Designo e S a Ce es g
Carrier Aggregation will significantl enhance DL/ULsignificantly enhance DL/ULbandwidthMaximum 100 MHz BWNon-contiguousimplementation is very challenging challenging Small Cell will be able tosupport more number of users with CA users with CA Small Cell over all designbecomes more complex
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with CASAI Technology, Inc
LTE MIMO Adaptive impact on the Small Cell Design o e S a Ce es g
Selecting the appropriate MIMO Scheme Multi-user MIMO offers theMulti-user MIMO offers thebest complexity performance trade-offSingle Site MIMO, we will
(a) MIMO Adaptive Switching
Single Site MIMO, we willconnect with single eNBwith one or multiple UEdevices.Cooperative MIMO: Cell edgeuser throughput is boosted
MIMO will be supported 3 d f i
(b) LTE Advanced MIMO Modes
3 modes of operation:- Transmit diversity- Receive diversity- Spatial multiplexing boost data rate
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(b) LTE Advanced MIMO Modes - Spatial multiplexing boost data rateOR - Beam forming to increase coverage
LTE Positioning & Trackingimpact on the Small Cell Designpac o e S a Ce es g
Satellite 3
Satellite 2
eNodeB - B
RTT Circle
Satellite 1
eNodeB - A
UE O-TDOA Hyperbola
Assistance Message
UE eNodeB
Timing Signals
eNodeB - C
O-TDOA Hyperbola
eNodeB
(a) A-GNSS working in LTE (b) OTDOA working in LTE
Stand-alone GNSS A-GNSS provide excellent accuracyStand alone GNSS, A GNSS provide excellent accuracyOTDOA method, the UE estimates the difference in the arrivaltimes of the PRS(Positioning Reference Signal) signals from separate base stations.
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p
LTE Coordinated Multipoint (CoMP)impact on the Small Cell Designpac o e S a Ce es g
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LTE Het Net impact on the Small Cell Designo e S a Ce es g
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LTE Advanced Small Cell Designchallengesc a e ges
Seamless Hand-off & Mobility management
Soft hand-off process between 3G, 4G and WiFiInter-RAT and Intra RAT between legacy and Advanced LTE eNBNon-Cellular Radio’s inter-working with LTE for traffic offload
Service Level QoS and SLA support Service Level QoS and SLA support Early deployments focused on data only. Ensuring Voice, Video, and Gamming etc QoS has certain limitations.SLA Enforcement for the different types of services
Self Configuration, Plug and PlayLTE Small cells required today lot of hand crafting and tuning for performance
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LTE Advanced Research Areas specific to small cellspec c to s a ce
Inter Channel Interference Coordination (ICIC) Methods and Optimization(ICIC) Methods and OptimizationBackhaul Traffic Congestion Traffic offload and Load balancingTraffic offload and Load balancingManaging the small cells, edge coverage and performance KPI’sand performance KPI sSeamless connectivity between multiple LTE Devices for applications deliveryLTE Devices for applications deliveryEnhanced MIMO, Beam forming and Adaptive Antenna Technologiesp gHet Net Robust Mobility Management
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LTE 3GPP Standard Gap’s
Carrier Aggregation for non-contiguous channel aggregation typical use case gg g ypscenarios were not supported by the LTE standard.For example: Group a,b,c,d,e has been classified, but no reference to groups d and e and e. Voice Over LTE with ultra low latency and high quality has not been supported by high quality has not been supported by the LTE standardSmall Cell load balancing has not Small Cell load balancing has not supported by the LTE Standard
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LTE 3GPP Standard Gap’s
Het Nets Robust operational scenario’s have not supported by the standardBackhaul Security issues have not been adequately addressed by the standardAMR Group level registration limitations not addressed by the standardInterference management control for small cells, Pico and Micro cells and isolation mechanisms not supported by isolation mechanisms not supported by the LTE standard
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LTE Advanced Network for India Rural Communicationd a u a Co u ca o
Rural network comprises of WiFi and LTE combination to reduce costLTE combination to reduce cost
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CAPX and OPEX has to be optimized
LTE Applications for India Rural Communicationu a Co u ca o
Applications: Tele Medicine Distance Education
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Applications: Tele-Medicine, Distance Education, Public Safety, and Disaster Management
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Conclusions and Recommendationseco e dat o s
LTE Small cell design LTE Standard gaps gchallenges need to be addressedLTE Ad d
g pspecific to small cells:
Small cell traffic load balancing need to be LTE Advanced
Technologies impact on small cell design
balancing need to be implementedAMR Group level registration and support
consideredLTE Network topology for Rural
registration and supportBackhaul traffic management Interference Control for for Rural
CommunicationsLTE Applications
Interference Control for Micro, Pico, and Femto cellsHet Nets Robust Mobility management support
ppenablement
management support
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Thank You
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