5 Things You Should Know About Fronthaul

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In this presentation we discuss the following topics surrounding fronthaul:

1. Why fronthaul?
2. Capacity requirements
3. Latency requirements
4. Fronthaul and small cells
5. Transport for Fronthaul

Published in: Technology, Business

5 Things You Should Know About Fronthaul

  1. 1. 5 THINGS YOU SHOULD KNOW ABOUT FRONTHAUL
  2. 2. AVIAT NETWORKS AGENDA 1) WHY FRONTHAUL? 2) CAPACITY REQUIREMENTS 3) LATENCY REQUIREMENTS 4) FRONTHAUL AND SMALL CELLS 5) TRANSPORT FOR FRONTHAUL
  3. 3. AVIAT NETWORKS WHY FRONTHAUL?
  4. 4. AVIAT NETWORKS THE DATA STORM Growth from 1.6 EB per month in 2013 to 11.2EB in 2017 (66%)* CAPACITY GROWTH HANDHELD DEVICES NETWORK COSTS MOBILE BROADBAND By 2017 there will be an increase on 67% in handheld devices* CAPEX will increase worldwide by 6% in 2014 to $104.5 billion** 1.5 Billion Mobile Broadband Subscribers Predicted By 2015** *Source: Cisco Visual Networking Index **Source ABI Research
  5. 5. AVIAT NETWORKS DENSER NETWORKS This has several problems:  How to meet the required coverage and capacity?  How to deal with interference?  How to manage increased complexity:  To increase spectral efficiency?  To manage customer’s data?  To deal with higher CAPEX and OPEX? the only way to deal with the data storm is to have denser wireless networks with increasing spectral efficiency
  6. 6. AVIAT NETWORKS STRATEGIES FOR DENSER NETWORKS RAN DECENTRALIZATION (SON, HETNETS) TRADITIONAL MACRO CELLS ALL IN ONE BBU / SMALL CELLS BACKHAUL RAN CENTRALIZATION (C-RAN) DISTRIBUTED ANTENNAS (DAS) REMOTE RADIO HEADS (RRH) FRONTHAUL WiFi OFFLOAD OFFLOAD
  7. 7. AVIAT NETWORKS WHAT IS FRONTHAUL? ‘CENTRALIZED’ OR ‘CLOUD’ - RAN
  8. 8. AVIAT NETWORKS BASE STATION SPLIT SYSTEM SOFTWARE POWER SYSTEM BASESTATION TRANSPORT MODULE BASE BAND MODULE RF MODULE CONTROL MODULE FRONT HAUL BBU / DU (REC CPRI) digital base band RRH (REC CPRI) analog frequency functions NETWORK INTERFACE AIR INTERFACE
  9. 9. AVIAT NETWORKS ADVANTAGES OF C-RAN  Resource pooling  Greener infrastructure (re-use)  Base station virtualization  Simplified management and operation  Coordination for interference mitigation (ICIC)  Multi technology support  No GPS in each remote site
  10. 10. AVIAT NETWORKS MAIN C-RAN CHALLENGE IS FRONTHAUL  High capacity low latency Fronthaul is needed  Fronthaul distance is limited due to latency  Base band interconnection in BBU hotel  Lack of management tools on Fronthaul links  No statistical multiplexing on Fronthaul links
  11. 11. AVIAT NETWORKS C-RAN offers many benefits for operators however Fronthaul challenges need to be addressed Takeaway:
  12. 12. AVIAT NETWORKS CAPACITY REQUIREMENTS
  13. 13. AVIAT NETWORKS CPRI- NO COMPRESSION WCDMA 5 MHz 10 MHz 20 MHz 3 Sector, 4x4 MIMO, 1 Carrier 922 Mbps 7.4 Gbps 14.7 Gbps 1 Sector, 2x2 MIMO, 1 Carrier 246 Mbps 1.2 Gbps 2.5 Gbps LTE Scenario
  14. 14. AVIAT NETWORKS COMPRESSION OF BASEBAND USER DATA  Multiple baseband compression techniques are currently being researched  Commercially available IQ compression causes some distortion in IQ constellation  IQ compression currently is below a ratio of 3 to 1
  15. 15. AVIAT NETWORKS CPRI- COMPRESSION (2.5 RATIO) WCDMA 5 MHz 10 MHz 20 MHz 3 Sectors, 4x4 MIMO, 1 Carrier 369 Mbps 2.9 Gbps 5.9 Gbps 1 Sector, 2x2 MIMO, 1 Carrier 98 Mbps 461 Mbps 983 Mbps Scenario LTE
  16. 16. AVIAT NETWORKS Compression will likely be required to make wireless CPRI Fronthaul a reality Takeaway:
  17. 17. AVIAT NETWORKS LATENCY REQUIREMENTS
  18. 18. AVIAT NETWORKS CPRI-ROUND TRIP LATENCY (LTE) “cable length latency” + CORECPRI BBU TRANSMISSION MEDIUM (FIBER / MICROWAVE) RRH IP BACKHAUL RRH CPRICPRI B C A A B C+TOTAL LATENCY= } FOR CPRI= 5 µs STANDARD DEPENDENT FOR LTE (100/200 µs)
  19. 19. AVIAT NETWORKS CPRI latency requirement (<200us) will demand the use of ultra low latency Fronthaul solutions Takeaway:
  20. 20. AVIAT NETWORKS FRONTHAUL AND SMALL CELLS
  21. 21. AVIAT NETWORKS EXPANSION USING FRONTHAUL + SMALL CELL CELL SPLIT USING FRONT HAULTRADITIONAL MACRO CELL DEPLOYMENT Source: NGMN
  22. 22. AVIAT NETWORKS TRADITIONAL DEPLOYMENT + SMALL CELL (BACKHAUL) TRADITIONAL MACRO CELL DEPLOYMENT MACRO CELL + SMALL CELL DEPLOYMENT Source: NGMN BACKHAUL
  23. 23. AVIAT NETWORKS Operators will use a combination of CRAN/RRH and Small Cells Takeaway:
  24. 24. AVIAT NETWORKS TRANSPORT FOR FRONTHAUL
  25. 25. AVIAT NETWORKS FIBER / MICROWAVE FRONTHAUL COMPARISON FIBER 70/80 GHz MICROWAVE LICENSED MICROWAVE (6 to 42 GHz) CAPACITY:1 SECTOR,10MHz, 2x2 MIMO, 1 CARRIER, NO COMPRESSION CAPACITY:1 SECTOR,10MHz, 2x2 MIMO, 1 CARRIER, COMPRESSION: 2.5 LATENCY Capacity WDM self seeded PON 1 fiber upto 10 Gbps per RRH 2.5 Gbps 1.2 Gbps LOS LOS Parabolic antenna Parabolic antenna LINK LENGTHS Maximum 40Km Maximum 2Km Maximum 60Km LATENCY 5 µs per Km 3 µs per Km + processing (between 5µsec and 50µsec) 3 µs per Km + processing (between 60µsec and 298µsec) CAPEX Very high Medium Medium OPEX Low Low Low SOLUTIONS SITE LOCATION /RESTRICTIONS Right of way issues REQUIREMENTS 1.2 Gbps 461 Mbps <200 µs for LTE
  26. 26. AVIAT NETWORKS Single channel compressed CPRI is the most likely application for centimeter wave microwave Fronthaul Takeaway:
  27. 27. AVIAT NETWORKS 1. C-RAN offers many benefits for operators however Fronthaul challenges need to be addressed 2. Compression will likely be required to make wireless CPRI Fronthaul a reality 3. CPRI latency requirement (<200us) will demand the use of ultra low latency Fronthaul solutions 4. Operators will use a combination of CRAN/RRH and Small Cells 5. Single channel compressed CPRI is the most likely application for centimeter wave microwave Fronthaul CONCLUSIONS
  28. 28. W W W . AV I AT N E T W O R K S . C O M

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