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ComNets
Xi Li and Liang ZhaoComNets University of Bremen
06. October 2010
Overview and Research Aspects of LTE SON
‐ ITG FG5.2.1 Workshop Stuttgart
ComNets2
Outline
Main Drivers for SON in LTEIntroduction of LTE SON
Standardization Status SON Functionalities SON Architecture
Related Work and Research ProjectsMain Research Aspects of LTE SON
Radio NetworkTransport Network
Conclusions
ComNets3
Outline
Main Drivers for SON in LTEIntroduction of LTE SON
Standardization Status SON FunctionalitiesSON Architecture
Related Work and Research ProjectsMain Research Aspects of LTE SON
Radio NetworkTransport Network
Conclusions
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Long Term Evolution
eNB
eNBeNB
eNB
MMES-GW / P-GW
MMES-GW / P-GW
EPC (Evolved Packet Core)
E-UTRAN
S1
X2
eNB: E‐UTRAN Node BMME: Mobility Management EntityS‐GW: Serving GatewayP‐GW: PDN (Packet Data Network) Gateway
The 3GPP introduces Long Term Evolution (LTE)
high throughput
low latency
increased system capacity
Improved coverage performance
for the Next Generation Mobile Network (NGMN)
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Main Drivers for SON in LTE
Rollout of the LTE leads to rapidly expanding number of Base Stations (new sites)
parallel operation of 2G, 3G and LTE
much higher complexity in network infrastructure and network management (Operation & Maintenance)
Self‐Organizing Network (SON) aims to
configure and optimize the LTE network
automatically by Self‐Configuration
Self‐Optimization
Self‐Healing
(Source: SOCRATES Project)
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Main Objectives of SON
Network Planning
Network Planning
Network Deployment
Network Deployment
Network Optimization
Network Optimization
Network Maintenance
Network Maintenance
Self‐Configuration functions reduce CAPEX
Self‐Configuration functions reduce CAPEX
Self‐Optimization & energy saving reduces OPEX
Self‐Optimization & energy saving reduces OPEX
Self‐Optimization and Self‐Healing functions improve user experiences
Self‐Optimization and Self‐Healing functions improve user experiences
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Outline
Main Drivers for SON in LTEIntroduction of LTE SON
Standardization Status SON FunctionalitiesSON Architecture
Related Work and Research ProjectsMain Research Aspects of LTE SON
Radio NetworkTransport Network
Conclusions
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Standardization Status
3GPP has introduced SON along its standardization path as required features for LTE deployments
Release 8
eNB Self‐configuration‐ S1, X2 interface‐ Automatic Neighbor Relation‐ Automatic Physical Cell ID assignmentSelf‐optimization ‐ Basic mobility load balancing
Multi‐vendor SON interworking
Release 9
Coverage & Capacity optimizationMobility load balancingMobility robust optimizationRACH optimization…
An important source of LTE SON development is the industry forum NGMN (Next Generation Mobile Networks)
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3GPP Specifications for SON
3GPP TS 36.902, “Evolved Universal Terrestrial Radio Access Network(E‐UTRAN); Self‐Configuring and Self‐Optimizing Network (SON) UseCases and Solutions”3GPP TS 32.500, “Telecommunication management; Self‐OrganizingNetworks (SON); Concepts and requirements”3GPP TS 32.501, “Telecommunication management; Self‐Configurationof Network Elements; Concepts and Integration Reference Point (IRP) Requirements”3GPP TS 32.502, “Telecommunication management; Self‐Configurationof Network Elements Integration Reference Point (IRP); Information Service (IS)”.3GPP TS 32.511, “Telecommunication management; Automatic Neighbour Relation (ANR) management; Concepts and requirements”3GPP TS 32.690, “Telecommunication Management; InventoryManagement (IM); Requirements.”
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Functionalities of SON
Self‐ConfigurationSelf‐Configuration
‐ plug and play of new eNBs‐ automatic neighbor lists‐ self configuring RF & transport‐ ….
Self‐OptimizationSelf‐Optimization
‐ coverage & capacity opt.‐ neighbor list opt.‐ interference control‐ energy savings‐ automatic handover opt. ‐ ….
Self‐HealingSelf‐Healing
‐ automatic detection of failures‐ automatic adjustment of parameters ‐ healing schemes
Main Benefits
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SON Architecture
Source: Nomor Research: White Paper "Self‐Organizing Networks (SON) in 3GPP Long Term Evolution"
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Outline
Main Drivers for SON in LTEIntroduction of LTE SON
Standardization Status SON FunctionalitiesSON Architecture
Related Work and Research ProjectsMain Research Aspects of LTE SON
Radio NetworkTransport Network
Conclusions
ComNets13
Related Work and Research Projects
The SOCRATES (Self‐Optimisation and self‐ConfiguRATion in wirelEss networkS) Project
EU 7th Framework Program
Jan. 1, 2008 – Dec. 31, 2010
Project objectivesDevelopment of methods and algorithms for self‐organization
Specification of the required measurements
Validation and demonstration of the solutions
Assessment of the operational impact
Input to 3GPP standardization and NGMN activities
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Related Work and Research Projects
The End‐to‐end efficiency (E3) ProjectFP7 EC Integrating Project (IP)
Jan. 1, 2008 – Dec. 31, 2009
Project objectives: Design, develop, prototype and showcase solutions to
guarantee interoperability, flexibility and scalability between existing legacy and future wireless systems
manage the overall system complexity
ensure convergence across access
technologies, business domains, regulatory
domains and geographical regions
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Related Work and Research Projects
Contributions by different equipment vendors, independents, and IT vendors
Source: from actix
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Outline
Main Drivers for SON in LTEIntroduction of LTE SON
Standardization Status SON FunctionalitiesSON Architecture
Related Work and Research ProjectsMain Research Aspects of LTE SON
Radio NetworkTransport Network
Conclusions
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Main Research Aspects of LTE SON
General considerations for all SON functionsDefine required measurements at the eNB and UE
Define the required measurement parametersDefine the measurement frequency for each parameter
Define algorithms to trigger parameter adjustmentsDetermine the thresholds to trigger parameter adjustmentsDetermine the frequency of parameter adjustments
Define rules of coordination and cooperation among different SON functions
Design SON architectureCentralized SON, or distributed SON, or hybrid SON
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Main Research Aspects of LTE SON – Radio Network
Mobility Load Balancing Optimization: to optimize cell reselection/HO parameters to cope with the unbalanced traffic load
What shall be the proper load definition?‐ radio load, transport network load, or even the processing load
‐ Split between uplink and downlink
‐ Split between different QCIs
Algorithm for load balancing ‐ The algorithm can be based on radio load, or transport network load or both of them
‐ If both radio load and transport network load are considered, which one will have higher priority?
‐ The algorithm shall also consider differentiation among QCIs
How to adjust parameters for cell reselection?
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Main Research Aspects of LTE SON – Radio Network
Coverage and Capacity Optimization: to optimize the network coverage and maximize the system capacity
Solutions to detect the coverage and capacity problems automaticallybased on eNB measurements and UE reports
Design a radio planning tool to solve the problems
Interference reduction
Mobility Robust Optimization: to automatically adjust the mobility parameters
Solutions to solve the mobility problems, e.g.‐ To identify a non‐suitable cell
‐ To identify problematic settings of cell selection/reselection parameters
‐ Minimize HOs when a UE is transited from idle to active mode
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Main Research Aspects of LTE SON – Radio Network
Energy Saving: to cut on operation expenses by energy savingSwitch off cells (especially needed when a larger number of Home eNBs are deployed in the network)‐ Main issue: when to active and deactivate the eNBs and how?
Adapt the transmission power‐ Adapt the transmission power while also ensuring no influence onthe coverage, handover and load balancing
Adapt the multi‐antenna schemes: some of the antennas can be switched off to save the power‐ Adapt among SIMO, MIMO, Beamforming to achieve the maximum capacity with the minimum transmission power
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Main Research Aspects of LTE SON – Transport Network
Introduction of SON for the LTE Transport NetworkTo optimize the transport resources (i.e. capacity) utilizationTo save the operation costs (for manual configurations) and bandwidth costs with optimized resource utilization
Possible Aspects:
Automatic transport QoS optimization
Automatic transport capacity allocation
Load balancing in the transport network (e.g. applying traffic engineering methods)
Transport admission and congestion control optimizations
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Main Research Aspects of LTE SON – Transport Network
Transport SON functions:Dynamic bandwidth allocation‐ Bandwidth allocation shall follow the changes in traffic load
• estimating effective bandwidth• when to trigger the bandwidth update and how
Dynamic tuning of QoS parameters‐ e.g. DiffServ model parameters, scheduler parameters, buffer management parameters per QoS class
Optimal configuration/re‐configuration of eNB connectivity with the S‐GW‐ for the Multi‐S1 scenario (i.e. one eNB connected with multiple GWs), how to configure/re‐configure in case of one S‐GW fails
Optimal load balancing ‐ e.g. to apply MPLS (Multiprotocol Label Switching) Traffic engineering method
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Outline
Main Drivers for SON in LTEIntroduction of LTE SON
Standardization Status SON FunctionalitiesSON Architecture
Related Work and Research ProjectsMain Research Aspects of LTE SON
Radio NetworkTransport Network
Conclusions
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Conclusions
SON is a promising approach to significantly reduce the network installation and operation costs, and as well can improve the user experiences
3GPP and NGMN have defined a set of LTE SON user cases and associated SON functions
Further Researches on different user cases and SON functions are needed for the LTE
LTE Radio SON
LTE Transport SON
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References
1. 3GPP TS 36.902, “Evolved Universal Terrestrial Radio Access Network (E‐UTRAN); Self‐Configuring and Self‐Optimizing Network (SON) Use Cases and Solutions”
2. 3G Americas: “The Benefits of SON in LTE”, December 2009
3. Nomor Research, White Paper: "Self‐Organizing Networks (SON) in 3GPP Long Term Evolution“
4. NEC, White Paper: "Self Organizing Network "
5. Motorola, white paper: " LTE Operations and Maintenance Strategy ‐ Using Self‐Organizing Networks to Reduce OPEX"
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Thank You for your attention!
Q & A