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1、Self-Organizing Networks:DoingMore with Less,James Hao,Wireless Basestation InfrastructureTexas Instruments,Exabytes(million terabytes),Triple Play(Mobile,TV,Internet),Operators want Heterogeneous NetworksOffload macro trafficOffer customized user-specific services at Homeor office,The problemMobile
2、 wireless data,per month,0.09,0.2,0.6,1.2,2.2,0,1.510.5,43.532.52,108%CAGR3.6,house,Macro-base station layoutOne femto clusterMax femto BSarea,Growing complexity,Network nodes from 20,200,2000,Parallel operation of multiple technologiesNumber&structure of parameters is complexvs.need for simplicityP
3、lug and Play is crucial to cheap rolloutsCustomer service calls impact OPEX,Courtesy:Cisco VNI Mobile Report,Femto ForumMax UE area,2009,2010,2011,2012,2013,2014,Definitions:self organizing network(SON),Self configurationConfiguration of PHYparameters,Automatic NeighborRelations,Self optimization,In
4、terference Managementand Capacity optimizationEnergy savings,Self healing,Evolution of SON work in industry groups,Business cases Use cases Solution ideas,Standardization,Study,SOCRATES,End-to-End Efficiency Project 2007-8 Femto Forum Interference Management study 2008-10,3GPP Standardization(ongoin
5、g),Use cases are being developed by Radio Access Network group,TR 36.902,O&M principles and functionality being defined by Service,Architecture group,TS 32.521,What should be normative?,“the UE shall”is a pretty common phrase in RAN specs.Do weneed phrases starting with“the eNB shall.”?How much of i
6、t do weneed?,SON within TI,Texas Instruments began looking at SON in 2008 Objective,Look at how OEMs can integrate SON solutions quickly,Goals,Assess impact on processor,Assess impact on hardware interfaces for a femto solution,Approach,Try to understand potential SON solutions,How do these solution
7、s impact processor,accelerator and analog,interfaces,Centralized,Input,Output,Input,IP mapping,Input,Input,Input,Distributed,Output,Output,Output,Output,Output,Output,Output,Output,Output,Input,Input,Input,Input,Input,Input,Input,TR 36.902:SON use casesOperator,Operator/OEMRRM,CoreNetwork,Capacity&c
8、overageoptimization,Physical cell identityconfiguration,Automatic Neighbor Relation,RACH optimization,Energy savings,Mobility robustoptimization,Mobility loadbalancing optimization,Interference reductionOEM/Inter-cell interferencecoordination(ICIC)Semiconductor,MAC/RLC/PDCPPHYSemiconductorVarying le
9、vels of impact on processor and hardware.Varying priorities,Input,Input,Output,Output,Input,Input,Operator,High impact use cases to semiconductorvendors,Mandatory+Proprietary messaging(S1/X2),PHYSemiconductor,Core NetworkEnergy SavingsOperator/VendorRRM/RRCInterference reductionSemiconductor/VendorM
10、AC/RLC/PDCP,Mandatory+Proprietary measurements(Software/Hardware),Interference reduction,FrequencyPlanning over20 MHz,5,10,5,Macro-base station layouthouseOne femto clusterMax femto BSareaMax UE areaHeterogeneous Network ScenarioCo-channel Macro/Femto cells,Question 0 Can operators deployHeterogeneo
11、us Femtonetworks using Rel-8 LTE?Question 1 How do femto cells impactperformance of existingmacro deployments?Question 2 How is femto performanceimpacted in the presenceof interference from macrocells?,Percentage of UEs with bitrate 1 Mbps,Packet Delay in milliseconds(90 percentile),SON:interference
12、 managementMacrocell performance impact due to presence of femtocells,1.Without SON:very adverse impact to macro layer2.With SON:Macro-layer performance almost as if no interference fromfemtocells3.Femto layer still able to provide 10Mbps service to each UE,1009080706050403020100,Macro only(noFemtoc
13、ells),Het-Net withoutSON,Closed-loopPower Control,120010008006004002000,Macro only(noFemtocells),Het-Net withoutSON,Closed-loopPower Control,Interference,not noise,is the problem,back off transmit power,SON energy savings:network level,Track UEs at the network,Turns Femto OFF,Home,Office,Turns Femto
14、 ON,Core Network tracks the UEs movementSyncs up with the Closed Subscriber List for the UEs relevant femtosCan we have hibernate states for femtos?What lies between ON/OFF?,Home eNode B,Network,Board/Chip,Transmit power(Watts),Control Transmit Power in eNB,SON energy savings:Home eNode BAverage Tra
15、nsmit Power,0.250.20.150.10.05,Macro Layer,Femto Layer,Home eNode B,Network,Board/Chip,0Macro only Het-Net without Het-Net withoutSON SONExample:Energy Savings at Network TX power reduced by 2 times formacro and 6 times femto Transmit power drives 25%offemto power consumptionAnalysis The algorithm b
16、acks off aggressiveinterferers that exceed target SINR,How do we set operating pointsfor analog front-ends?,SON energy savings:board/chip levelSwitch from MIMO to SIMO,Which option is best?,ProcessorProcessor,RX chainTX chain1TX,1RX1TX,1RX,Home eNode B,Network,Board/Chip,L3(RRM/RRC)Control,MAC Libra
17、ry,SON Support,Library,SON system and architecture impact,Minimal additionalsoftware Layer 1:Re-usemandatorymeasurements Layer 3:Small memory andMIPS overhead,Macro,DSP,DSP,NetworkCo-processor,SONAlgorithmLibrary,DSPNetworkCo-processor,DSP/analog Rx chaininterface Network Listen Mode(NLM):Receive ch
18、ainfor DL freq.Energy savings:Scalingdown from 2TX/2RX to1TX/RX,FemtoDSP DSP DSP NetworkCo-processorRLC/PDCP LibrariesMAC SchedulerLibraryLTE Symbol Foundation LibraryRate PHY Libraries Signal Proc/Matrix Math/FFT/FIR,RTOS(DSP/BIOS)DSP,Chip Support AcceleratorLibrary Co-processor drivesHardware(Nyqu
19、ist N x C64+)Tx ChainRx ChainNLM,Next steps,Learning from SON Interference System study,and evaluation,SON algorithms reduce power consumption,This minimizes interference guaranteed minimumcapacity and good QoS critical for HetNet deployments TI standards team is engaged with RAN1/2 looking at power,control techniques,SON is fully supported by TIs programmable,C6x-based Multicore SoC Architecture,Partnering to demonstrate working SON system,on this platform,Thank you!,James Hao,Wireless Basestation Infrastructure,Texas Instrumentsjames-,
