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LTE Backhaul Challenges, Small Cells and the Critical Role of Microwave
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LTE Backhaul Challenges, Small Cells and the Critical Role of Microwave

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Aviat Networks's chief technology officer …

Aviat Networks's chief technology officer
(CTO), Paul Kennard, offers a presentation to IEEE's Communications Society on the critical role microwave networking will play in the deployment of Small Cell backhaul to service the throughput needs of LTE 4G mobile telecommunications providers.

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  • 1. IEEE COMSOC PANELLTE BACKHAUL CHALLENGES,SMALL CELLS AND THECRITICAL ROLE OFMICROWAVEPAUL KENNARD, CTO | AVIAT NETWORKS 1
  • 2. LTE (Lon g Ter m Ev oluti 4G on) 10x f aster QoS, than 3G Low All-I laten P cy Low Cost 3 AVIAT NETWORKS |
  • 3. ?
  • 4. LESSONS LEARNED #1CONSTRUCTION (not capacity) is key LTE challenge
  • 5. LTE CAPACITY REQUIREMENTS Theore&cal  Single  User  Data  Rate     Down/Up  [Mbps]     Close   Medium   Far   10MHz   43  /  14.4   28  /  9.5   14  /  4.8   real scenario is 100-150mbps backhaul per 3 sector cellsite6 AVIAT NETWORKS | 20 AUGUST 2010
  • 6. AND PROPER PLANNING EASES RING CAPACITY DEMANDS 50Mbps     50Mbps Ring Capacity 300Mbps Gateway Node     100Mbps 50Mbps 50Mbps 50Mbps     50Mbps typical overbooking factor for mobile operator = ~3x ring capacity ~100mbps in this case7 AVIAT NETWORKS | 20 AUGUST 2010
  • 7. Capacity 1 Gbit/s400 Mbit/s Cell-Site Capacity100 Mbit/s Time Zone of Capacity Growth Maximum Cell-site Capacity LTE cannot outstrip microwave capacity to cellsite
  • 8. BECAUSE MICROWAVE HAS EVOLVED…Strategy Technique1.  More Spectrum •  Multiple channels with link aggregation (More Hz) (incl CCDP) – leverage N+0 •  ACM2.  More Spectral Efficiency •  Higher modulations (512/1024 QAM, ACM) (More Bits per Hz) •  FEC redundancy3.  More “Effective” •  Header optimization / suppression Throughput •  Payload compression (More Data per Bit) •  Asymmetrical RF and is a high capacity transport solution
  • 9. LESSONS LEARNED #2MICROWAVE MEETS LTECAPACITY NEEDSeven for large rings and multi-cellsite links
  • 10. FUTURE OF LTE BACKHAUL IS: Small Cells!!!11 AVIAT NETWORKS | FEBRUARY 2012
  • 11. HOWEVER, SMALL CELLS WILL CHANGE THE BACKHAUL PARADIGM… 1.  More sites higher cost, more complexity 2.  Different sites new technologies and construction challenges will get far worse12 AVIAT NETWORKS |
  • 12. Wired   Wireless     Wireless     (fiber/cable/dsl)   (LOS)   (NLOS)   200+Mbps  (shared,  may  Capacity   10Gbps   1-­‐2Gbps   be  ok  for  HSPA)  Site  LocaLon  /   Not  available,  costly   LOS   Flexible.  NLOS  RestricLons   install   Parabolic   Depends  on  frequency.     Limited  for  pt-­‐mpt.      Backhaul  Distance   Long  distance  but  costly   Millimeter  wave  limited   Pt-­‐pt  ok  Latency   us   us   5-­‐10ms  (ok  for  HSPA)  CAPEX   Very  high   High  (today)   Low  OPEX   Low   Medium   Medium   Costly.  Unlicensed  Spectrum   N/A   Available   opLons  very  risky  meaning… none of today’s backhaul solutions will suffice
  • 13. LESSONS LEARNED 3SMALL CELL NOT SIGNIFICANT MARKETuntil backhaul gets cheaper and easier
  • 14. WHICH MEANSFUNDAMENTAL INNOVATIONS WILL BE REQUIRED INFOUNDATIONAL MICROWAVE TECHNOLOGY…all in one tiny box... including antenna!15 AVIAT NETWORKS | FEBRUARY 2012
  • 15. OTHER NEW APPROACHES WILL NEED TO BE CONSIDERED CACHING DISTRIBUTED INTELLIGENCE16 AVIAT NETWORKS | 20 AUGUST 2010
  • 16. and Microwave Networking solutions will emerge Security   Redundancy  and   SynchronizaLon   ProtecLon   ACM,  RF   RouLng   opLmizaLons   Integrated,  IP   Others  (DPI,   QoS,  Bandwidth   management   Microwave   caching,  CDN,   Pla[orm   etc)  17 AVIAT NETWORKS | Microwave Dumb Pipe
  • 17. TO ACHIEVE ALL THIS, WE NEED TO PAYATTENTION TO WHAT’S IMPORTANT… AMC  Pacer  –  voted  worst  car  of  all  Lme!  
  • 18. THANK YOUAVIAT NETWORKS |2019 AUGUST 2010