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NGMN Requirements for Small Cell Backhaul
 

NGMN Requirements for Small Cell Backhaul

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Presented by
Julius Robson, Lead NGMN Small Cell Backhaul
Cambridge Broadband Networks Ltd
ICT KTN & Cambridge Wireless Radio Technology SIG
3 October 2012

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    NGMN Requirements for Small Cell Backhaul NGMN Requirements for Small Cell Backhaul Presentation Transcript

    • Next Generation Mobile Networks NGMN Requirements for Small Cell Backhaul Julius Robson, Lead NGMN Small Cell Backhaul Cambridge Broadband Networks Ltd ICT KTN & Cambridge Wireless Radio Technology SIG 3 October 2012 jrobson@cbnl.com 1
    • The NGMN Alliance  The NGMN Alliance is developing, consolidating and communicating operator requirements to ensure that customer needs and expectations on mobile broadband are fulfilled.  The Alliance actively drives global alignment, harmonisation and convergence of technology standards and industry initiatives with the objective to avoid fragmentation and to guarantee industry scale.  A global presence has been established that comprises a leadership network of more than 60 partners: Operators, Vendors, and Universities. Several Cooperation Partners support the NGMN Alliance in projects, conferences, and through liaison statements  The joint work programme covers key topics on Networks, Devices, and Application Enablers as well as Spectrum Demand, SDO Alignment and Technology Evolution. …driving industry alignment 2
    • The Alliance is supported by the keyindustry players More than 50% of world wide subscribers More than 90% of worldwide equipment
    • …closely cooperates with key industryorganisations and research initiatives NGMN Requirements Testing & Trials NGMN cooperation partners and organisations included in NGMN liaisons 4
    • Work focus on deployment, operations andfuture technology enhancements Overview of NGMN Work Areas  Share experiences from  Provide requirements to  Ensure global alignment deployment and drive future technology to avoid fragmentation operations to improve enhancements of standards and performance solutions Deployment Operational Network Application Standards Innovation Spectrum Devices Dialogue Aspects Efficiency Architecture Enablers Alignment LTE-FDD/TDD  SON use  Backhaul  Global  Multi-mode,  QoS, QoE  Standards  Cognitive Convergence cases Solutions Spectrum multi-band Definition and evolution Radio Harmonisation devices Measurement Antenna design  OSS  Centralised  Technology and interfaces RAN  Bandwidth  Certification  Smart evaluation Performance aggregation Networks Measurement  OSS for  Heterogeneo  Voice over LTE Converged us Networks Networks Evolution and Operations 5
    • NGMN Backhaul Evolution Projecthttp://www.ngmn.org/nc/downloads/techdownloads.html Guidelines for LTE Backhaul Traffic Estimation Jul 2011 Small Cell Optimised Backhaul Backhaul Security Requirements Requirements In LTE Backhauling Jun Feb 2012 2008 2012 Integrated Original QoS Small cell macrocell Detailed Management specific focus Refinement aspects coming 6
    • Motivation for Small Cell Backhaul Project:  Operators are currently considering deploying small cells as a complement – or possibly alternative to their macro cell networks  Small cells will have different backhaul needs to macros and many new solutions are being proposed to meet them yet it is still uncertain which ones will work best  The purpose of this study was to help move the industry forward by clarifying consensus around operators’ requirements for small cell backhaul  These will inform the industry as to what operators need, and aid in the selection and comparison of solutions 7
    • Where do backhaul requirements come from? Transport Network Small Cell Backhaul Core Services Small Cell RAN • Small cells can be deployed in a number of ways depending on the network issue they are aiming to solve • The purpose of backhaul is to connect the small cells to the core with the required Quality of Service • Backhaul requirements depends on the use case for the small cell 8
    • Overview Define Define CompareSmall Cells & Requirements Solutions Use cases for small cell for small cell within scope of backhaul backhaul this studyOperator deployed Capacity Fibre-Capacity hot spot Coverage NLoS <6GHz-Coverage not spot Availability Microwave PMP/PTP Physical design 60/80GHzHSPA+, LTE, WiFi : TVWS: : :: 9
    • Overview Define Define CompareSmall Cells & Requirements Solutions Use cases for small cell for small cell within scope of backhaul backhaul this studyOperator deployed Capacity Fibre-Capacity hot spot Coverage NLoS <6GHz-Coverage not spot Availability Microwave PMP/PTP Physical design 60/80GHzHSPA+, LTE, WiFi : TVWS: : :: 10
    • Small Cell Use Cases Small Cell Use CasesSmall cells Consumer and OperatorDeployed by Enterprise deployed (Public Access)Primary Coverage & Capacity CoverageMotivation QoE enhancementUse Case Femtocells Targeted Non-targeted Outdoor Indoor Home / Enterprise Hot Spot ‘Peppered’ Not-spot Not-spot Focus of NGMN requirementsSource: “Small Cell Deployment Strategies”, CBNL June 2011, http://goo.gl/xLtcR 11
    • Coverage or Capacity A Definition: …depends on presence of existing macro coverage: Hot spot Not spot macro No existing macro coverageMacro coverage provides service Small cell introduces serviceBut QoE is poor during busy times More CAPACITY needed Basic COVERAGE needed 12
    • Capacity: Targeted or Peppered? 1) Un-served demand Hot spot ( existing macro cov) Not spot (no existing macro cov) 3) Backhaul Connectivity Wired connection LoS from Hub 2) Suitable site NLoS with sufficient Tput Power, access, etc demand coverage How well can we match small cell coverage to demand in practice? A blanket approach might be more cost effective in some cases 13
    • Overview Define Define CompareSmall Cells & Requirements Solutions Use cases for small cell for small cell within scope of backhaul backhaul this study 14
    • Backhaul Requirement Categories The usual suspects Small Cell Specific In small cell flavours Capacity Cost Physical provisioning Design QoS Security Support Coverage & Connectivity Availability Sync Ease of Installation Network OAM Architectures NGMN’s existing macro backhaul requirements have been updated and new small cell specific items added 15
    • Coverage and Connectivity  Small cells typically below rooftop 3-6m above street Macro level  In a Het-Net scenario, macrosites may double up as aggregation sites for small cells  ‘Last mile’ backhaul therefore provides connectivity between macro sites and small cell sites Typical Small  Connection must meet QoS Cell locations requirements… Coverage means providing connectivity between small cell sites and local aggregation points which meets QoS requirements 16
    • Quality of Service Requirements  Consumers must have same QoE (Experience) over small cells as over macrocells Not spotHot spot macroBackhaul availability can be relaxed Availability cannot be relaxedCapacity must not be limited by backhaul Capacity can be relaxedBackhaul QoS requirements depend on deployment scenario 17
    • Calculating Backhaul Traffic Core network S1 User plane traffic (for 1 cell) RAN +Control Plane +X2 U and C-plane +OA&M, Sync, etc +Transport protocol overhead +IPsec overhead (optional) Consider user plane traffic + overheads 18
    • Small Cell Backhaul Provisioning Key Assumptions: evaluation methodology based on "Guidelines for LTE Backhaul Traffic Estimation", NGMN Alliance, July 2011 U-plane Cell Tput based on NGMN simulations for macro cells scaled to represent the small cell environment Overheads added for transport protocol, IPsec security and X2 where appropriate  Recommended provisioning based on small cell throughput plus overheads for X2, IPsec transport etc.  Provisioning for N small cells = Max(peak, N x mean)  Capacity should not be limited by the backhaul at Hot-Spots …but may be relaxed at coverage Not-spots 19
    • Overview Define Define CompareSmall Cells & Requirements Solutions Use cases for small cell for small cell within scope of backhaul backhaul this study 20
    • Last Mile Backhaul Options Macro BTS site with fibre or MWR backhaul Line of Sight microwave nLOS NLOS (PMP) LOS/nLOS PTP LOS/nLOS/ LOS/nLOS/ NLOS NLOS small cell site cable/fibre  Small cells may connect via macro sites  A mix of wired and wireless and backhaul technologies (e.g. PTP, PMP, LOS, n(ear) LOS, N(on)LOS, FTTx) will be needed to reach Small Cell BTS sites  Small Cells may be connected in chain, tree or mesh topologies The main differences between small and macro cell backhaul are in the last mile
    • Small Cell Backhaul Solution Types Fibre Wired DSL Spectrum Licensing Carrier Frequency Dynamic + lightSmall Cell TV White Space <800MHzBackhaul Area licensedSolutions Non LoS <6GHz Unlicensed Link licensed (PTP) Microwave 6-57 GHz Wireless Area licenced (PMP) 60GHz 57-64 GHz Unlicensed E-Band 64-85 GHz Light Licensed Satellite Managed Service 22
    • Small Cell Backhaul White PaperDownload from: www.ngmn.org  Small cell definition and scope of use cases  Backhaul Requirements – Small cell network architectures – Physical design – Coverage and connectivity – Capacity Provisioning (dimensioning) – QoS support – Synchronisation – Availability and resiliency – Security – Operational, Management, Traffic Engineering  Backhaul Solutions – Wired/Wireless LOS/NLOS etc  Requirement Statements Main contributors: 23
    • Summary and Key Messages Backhaul is a key enabler for small cells, but there is uncertainty around which solutions are suitable. The NGMN will help move the industry forward by clarifying consensus around requirements We focus on operator deployed, open access small cells and ‘last mile’ backhaul Key messages: – Cost per small cell backhaul connection will need to be much lower than for macrocells, but consumer Quality of Experience cannot be sacrificed – There is however scope to relax some aspects of backhaul offered QoS:  Availability may be relaxed for capacity sites at hot-spots  Capacity provisioning may be relaxed for coverage sites at not -spots – Small cells dictate the following new requirements for backhaul:  Coverage down to street level sites with sufficient QoS  Secure and compact physical design for rapid low cost installation – A toolbox of solutions may be needed to address diverse deployment scenarios Our white paper captures these issues and defines a set of requirement statements This can be a basis for further work by groups such as the Small Cell Forum and MEF 24
    • Thank you 25