Andy sutton - Multi-RAT mobile backhaul for Het-Nets


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At our 5th Telecoms Evangelist meet up Andy Sutton of EE gave a fantastic presentation reviewing the latest trends and developments in mobile backhaul architecture, strategy and technology. Starting with a review of backhaul capacity, performance requirements and protocol architecture, the presentation initially focused on the macro cell layer before going on to discuss options for evolving towards a true multi-layered heterogeneous network. Take a look!

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Andy sutton - Multi-RAT mobile backhaul for Het-Nets

  1. 1. 18/06/20131Multi-RAT mobilebackhaul for Het-NetsAndy SuttonPrincipal Network ArchitectNetwork Strategy19th June 2013Contents:1. Brief overview of EE2. Introduction to multi-RAT, multi-vendorbackhaul3. Understanding the capacity requirementsfor current and future backhaul4. Ensuring high performance and low latencybackhaul implementationp5. Evolving backhaul architecture to supportsmall cells and HetNets6. Summary2Telecoms Evangelist No.5
  2. 2. 18/06/20132Our Orange and T-Mobile inheritanceA marriage of two great companies, with strong brands and a combined subscriber base of over29 million. Technology have played a strong role delivering synergies and positioning EE forcommercial and network leadership.In September 2009 it was announced that France Telecom and Deutsche Telekom had agreedto merge T-Mobile UK and Orange UK into a 50:50 joint venture to create the UK’s leadingmobile operator. The new company was officially formed on April 1 201018/06/2013Telecoms Evangelist No.5 3EE: THE BIGGEST AND BEST NETWORKEurope’s fastest 4G rollout> The UK’s first 4G network− 4G in 80 cities and towns, and 55%population coverage by June 2013population coverage by June 2013− 98% 4G coverage by end of 2014− Increasing depth of coverage andcapacity in the top 16 cities> The UK’s biggest 3G network− DC-HSDPA covering 75% of thepopulation (80% by December 2013)population (80% by December 2013)− 3G HSPA+21 across 95% of thepopulation> Fibre to 13m homes and businesses> Evolving communication with VoWiFi,VoLTE, RCSe, and service with qualitydifferentiation
  3. 3. 18/06/20133Mobile video consumption increases with 4G adoptionArsenal vs Man City?18/06/2013Telecoms Evangelist No.5 5Man U vs Liverpool?KO 13:30Arsenal vs Man City?KO 16:00What exactly is mobile backhaul…• Mobile backhaul provides the control and user plane connectivity betweenthe radio base stations at the cell sites and associated network nodes onthe connectivity sites (edge of the core network)• 2G – GSM BTS & BSC (Abis)• 3G – UMTS NodeB & RNC (Iub)• 4G – LTE eNB & SeGW, then on to EPC (S1) [+X2 transport]• In addition, the backhaul network carries network control, operations andmaintenance traffic• Mobile backhaul is evolving from TDM and ATM to all IP/EthernetMobile backhaul is evolving from TDM and ATM to all IP/Ethernet• Mobile backhaul must scale to support the capacity requirements of theRAN technologies – 2G/3G/4G, possibly WiFi too• Mobile backhaul must meet strict performance criteria relating to latency,packet delay variation and packet error loss rate6Telecoms Evangelist No.5
  4. 4. 18/06/20134GSM network architecture (HLR and databases not illustrated)GERAN - GSM/EDGE Radio Access Network2GMSS2GBTS2GBTS2GBSC+PCUTRAU/MGWMGW2GBTS2GBTSBSC+PCUSGSN GGSN7Red and blue lines refer to control and user planeUMTS Network Architecture (HLR and databases not illustrated)Over time the CS & PS core have become common to both2G & 3G Radio Access Networks3GMSS3GNodeB3GNodeB3GRNCTRAU/MGWMGWNodeB3GNodeBRNC SGSN GGSNRed and blue lines refer to control and user plane 8
  5. 5. 18/06/20135EPS - Evolved Packet SystemLTE - Long Term Evolution / EPC - Evolved Packet Core4G HSS4GeNB4GeNBMMES-GWPDN-GWPCRFHSSR8 LTE specifies an IP TNL, eNBs support Ethernet connectivity4GeNB9Telecoms Evangelist No.53GPP mobile backhaul interfaces2GBTS3GNodeB4GBSCRNCAbis interfaceIub interfaceS1 interfaceTelecoms Evangelist No.5 104GeNBEPCS1 interface
  6. 6. 18/06/20136Mobile backhaul…• Mobile backhaul is a complex subject, it’s farmore than “transmission”• Developing a mobile backhaul architecture andassociated technical strategy requires a detailedassociated technical strategy requires a detailedunderstanding of:• Multiple mobile RAN technologies• GSM/EDGE, UMTS/HSPA+ & LTE• Tele-traffic theory and dimensioning• in a post-Erlang environment• Transport technologiesTDM (PDH SDH) Ethernet PWE3 IP ATM FR MPLS• TDM (PDH, SDH), Ethernet, PWE3, IP, ATM, FR, MPLS• Physical layer transmission systems• Fibre, Copper & Microwave• Operations, administration, maintenance andprovisioning• QoS, Synchronisation, regulation etc…Telecoms Evangelist No.5 11Mobile backhaul traffic - high level representationGroup Flow2GCS voiceCS dataPS dataControl plane PTPControl planeO&M3Grt‐DCHnrt‐DCHHSPAControl planeO&MLTEQCI 1QCI 2QCI 3QCI 4QCI 5QCI 6QCI 72GBTS3GNodeB4GeNBBSCRNCPTPIEEE1588-2008Precision Timing ProtocolAbisIubS1 (+X2)Telecoms Evangelist No.5 12QQCI 8QCI 9S1 Control planeO&MX2 User PlaneX2 Control PlaneMgmtCSG O&MTx O&MIP IGP etc.Sync IEEE1588v2 PTPeNBSeGWNMSMicrowaveIDUOAM fromexternal equipmentmicrowave, routers etc.
  7. 7. 18/06/20137Protocol architecturemobile backhaul user plane UserdataPDCPUserdataUserdata• GSM IP based AbisGSM UMTS LTEP-TRAUUDPIPGTP-uUDPIPUDPIPRLCMAC-dHS DSCH FPPDCP• Proprietary implementation of IPbased Abis• UMTS IP based Iub• 3GPP R5 IP transport in UTRANTelecoms Evangelist No.5 13IP Sec (ESP)Outer IPVLANEthernetIP Sec (ESP)Outer IPVLANEthernetVLANEthernet• LTE IP based S1 and/or X2• 3GPP R8 Evolved Packet SystemUnderlying (physical) networkMobile backhaul traffic - high level network diagram2GPTPCSG - flexibility point - policy and QoSimplementation point - service enabler…FE or GE - Serial bit streamEE/H3G network sharevia MBNL - 3G MORANsplits Iu-cs/Iu-ps toseparate core networksSingle RAN basestations areavailable to support2G, 3G and 4G – EEuse SRAN for2G/4G whilst 3G is2G Abis migrates from TDM toIP therefore IPSec isimplemented to ensurenetwork service2GBTS3GNodeB4GeNBBSCRNCSeGW2G/4G whilst 3G ison MORAN Node BPoint to pointmicrowave radiosystems scale to1Gbps+ in thetraditionalmicrowave bands(6 - 42GHz)Telecoms Evangelist No.5 14SeGWNMSMicrowaveIDU2G3G 4GIDUMASG - flexibility point - policy and QoSimplementation point - service enabler…2G, 3G & 4G from a sub-tended site connectedby point to point digital microwave radioThird party backhaul –Optical fibre networksdelivering layer 2 andlayer 3 servicesNew <6GHz n/NLoS backhaul radios, V and E band systems along with new mesh concepts
  8. 8. 18/06/20138Real LTE deployment in multi-RAT network- Focus on mobile backhaulTelecoms Evangelist No.5 15Backhaul capacity for Super Macros• Macro cell evolution is the first step towards HetNets• Super macros contain multiple RATs, including multi-band LTEp p• Super Macros will typically contain 3 or 6 cell sectors• Available spectrum includes:• 2 x 5MHz @800MHz• 2 x 45MHz @1800MHz• 2 x 20MHz @2100MHz• 2 x 35MHz @ 2600MHz• Super macros may be standalone sites with ELL or hub sites for sub-tended microwave connected sites• Backhaul may support more than one MNOTelecoms Evangelist No.5 16
  9. 9. 18/06/20139Optimising ‘end to end’ LTE traffic performanceUser data rate/throughput, latency, PDV, PELR, availability…Radio interfaceResource allocationRetransmissions etc.Microwave CSG Backhaul circuit S1 flex IP VPN EPC PeeringTelecoms Evangelist No.5 17UEUE radio layerApplications optimisation eNB processing MASG Security infrastructure SGi service LANExternalnetworks…and back…Network evolution - Super Macros, Small cells and in-building solutions…Macro sitesMacro sitesMicrocell Microcell18IndoorsolutionsHot spot Cell edgeSmall Cells as anunderlay networkTelecoms Evangelist No.5
  10. 10. 18/06/201310Network evolution - Super Macros, Small cells and in-building solutions…Mobile backhaul may be integrated with themacro network or, decoupled (complete off-load) or, a hybrid of the two approaches…19Several factors will influence decisions – deployment timeline, RAT, spectrumstrategy and future network evolution strategy (co-ordination, C-RAN etc.)Telecoms Evangelist No.5Small cell backhaul architecture – two optionsBackhaul could be fully integrated with the macro network or completelydecoupled with an overlay (underlay) solutionIntegrated solution requires high-capacity macro layer backhaul howeverIntegrated solution requires high-capacity macro layer backhaul howeveropens up future opportunities for coupling between layersDedicated backhaul decouples the traffic load between macro and smallcell backhaul solutions – may limit future options for co-ordination…Requirements will change as we evolve from 3G to LTE small cellsTelecoms Evangelist No.5 20
  11. 11. 18/06/201311Small cell backhaul architectures- integrated or decoupled…Telecoms Evangelist No.5 21Macro backhaul not illustrated for claritySmall cell backhaul architectures- integrated or decoupled or a hybrid of the two…Macro backhaul not illustrated for clarityTelecoms Evangelist No.5 22Macro backhaul not illustrated for clarity
  12. 12. 18/06/201312Summary•Many factors will influence mobile backhaulevolution – technical, commercial, regulatory,strategic…g•Backhaul capacity needs to scale significantly tosupport multi-RAT base station sites, particularlyif backhaul is shared between operators•Single RAN platforms support Co-Tx of multipleRAT backhaul over a single physical interfaceQ lit f i i ‘ d t d’•Quality of experience is an ‘end to end’consideration, however backhaul could have asignificant impact•Small cells must integrate in a cost-optimisedmanner, consider evolution to HetNets…23Telecoms Evangelist No.5