Your SlideShare is downloading. ×
0
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
C-RAN architecture and fronthaul challenges
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

C-RAN architecture and fronthaul challenges

26,788

Published on

Orange Labs Networks …

Orange Labs Networks
Anna Pizzinat, Philippe Chanclou, Fabien Le Clech, Fabienne Saliou, To-Linh Reedeker,
Thierno Diallo, Yannick Lagadec, Alan Stidwell, Zhenning Shi, Géraldine Calvignac,
Stéphane Gosselin, Bernard Landousies, Fabrice Herviou, Yann Loussouar

LTE Backhaul Summit 2013, Amsterdam, June 25th 2013

Published in: Technology, Business
6 Comments
42 Likes
Statistics
Notes
  • Question: How to resolve clock and phase synchroniztion issue if Ethernet or PON is used as fronthaul? Do you have a successful example for packet based fronthaul?
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Excellent presentation on Fronthaul Options. How can I download the slides?
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Zahid,
    It is wonderful presentation for fronthaul concept. Here is another solution for fronthaul based on active WDM. http://asia.lteconference.com/wp-content/uploads/1140120903-flexiHaul_solution_for_4G_and_Beyond%28Down%29.pdf
    flexiHaul has been deployed in SKT, the largest LTE operator in Korea. All the deployments are based on ring topology. Welcome you to contact me if you need more info.
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • No whitepaper. Its just presentation.
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Is there a white paper for this,where can i download it
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total Views
26,788
On Slideshare
0
From Embeds
0
Number of Embeds
55
Actions
Shares
0
Downloads
0
Comments
6
Likes
42
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. France Telecom Group confidential C-RAN architecture and fronthaul challenges Orange Labs Networks Anna Pizzinat, Philippe Chanclou, Fabien Le Clech, Fabienne Saliou, To-Linh Reedeker, Thierno Diallo, Yannick Lagadec, Alan Stidwell, Zhenning Shi, Géraldine Calvignac, Stéphane Gosselin, Bernard Landousies, Fabrice Herviou, Yann Loussouarn anna.pizzinat@orange.com LTE Backhaul Summit 2013, Amsterdam, June 25th 2013
  • 2. 2 France Telecom Group confidentialOrange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 Contents section 1 What is BBU hostelling/C-RAN? - the steps towards C-RAN - BBU hostelling/C-RAN expected benefits section 2 A new segment appears: fronthaul - fronthaul technical requirements - regulation issues - which fronthaul solution? section 3 Conclusions
  • 3. 3 France Telecom Group confidentialOrange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 RRU RRU RRU System module coax BBU D-RoF RRU: Remote Radio Unit RRH: Remote Radio Head BBU: BaseBand Unit CSG: Cell-Site Gateway D-RoF: Digital Radio over Fiber, CPRI or OBSAI stand; Step 1: Macro base station Step 2: Distributed base station, «traditional» backhaul RRH RRH RRH System module D-RoF BBU RRH ~15kg CSG  RRH close to the antenna  Energy savings  Deployed  But, if cell site not secured, IPSec needed adding OPEX+ CAPEX  Space constraints in cell site cabinet IP/MPLS network fibre S1 X2 Central Office CSG Backhaul: from CSG to first node of mobile core network for LTE macro site 200 to 800 Mbit/s fibre
  • 4. 4 France Telecom Group confidential optical distribution network Step 3: BBU hostelling with stacking (or BBU centralisation) RRH RRH RRH RRH RRH RRH IP/MPLS network D-RoF S1 Central Office BBU System module BBU System module BBU System module MASG Backhaul D-RoF Fronthaul : CPRI Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 Already deployed in some countries by BBU stacking. Next generation of BBU products will support multiple sites (first level of pooling) and implement a proprietary internal interface to enable CoMP support
  • 5. 5 France Telecom Group confidentialOrange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 optical distribution network Step 4: C-RAN (or BBU hostelling with resource pooling) RRH RRH RRH RRH RRH RRH IP/MPLS network S1 X 2 Central Office BBU System module D-RoF RRH RRH RRH Load balancing Fronthaul Backhaul • Goal: reach BBU pooling at user equipment (UE) level • Still at research level RRH might be replaced by Active Antenna Arrays (AAA): antennas with integrated RRH 4 Cs of C-RAN: Centralization, Cloud, Cooperation, Clean
  • 6. 6 France Telecom Group confidential BBU centralisation/C-RAN expected benefits  Radio performances  Very low latency between BBUs enables better cell edge user throughput in LTE-Advanced.  X2 optimisation in BBU centralisation → Less S1 and X2 interfaces to core network in C-RAN  Future proof solution for CoMP implementation.  C-RAN: mobility management simplification  Site engineering solution  Footprint reduction  In some specific cases, BBU hostelling could become the only practical solution  Cost reductions  Expected reduced costs for maintenance and site installation  No need for IPSec  Energy savings  RAN equipment: same costs expected for BBU centralisation, advantages might come with C- RAN with pooling at UE level (but still at research level).  However, the new fronthaul segment makes it difficult to assess the TCO Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013
  • 7. 7 France Telecom Group confidential Definition of fronthaul and backhaul RRH RRH RRH RRH RRH RRH IP/MPLS network D-RoF S1 Central Office BBU System module BBU System module BBU System module MASG fronthaul backhaul EPC EN EN Actually backhaul is no longer needed if the BBU hotel is co-located with the first node of mobile core network Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013
  • 8. 8 France Telecom Group confidential Fronthaul: technical requirements  Digitised radio signal → high data rates with respect to traditional backhaul.  Standards:  CPRI (Common Public Radio Interface) → the most used by the vendors  OBSAI (Open Base Station Architecture Initiative)  Bit-rate requirements per antenna site:  3 sectors LTE 20MHz 2x2 MIMO → CPRI 3x2.457Gbit/s  Complete radio configuration for LTE-A + 3G+ 2G: up to 15 RRHs up to 20Gbit/s  Latency:  CoMP implementation for LTE-A imposes maximum round trip propagation time of ~200-400µs i.e. 20-40km optical fibre (without active equipment)  Jitter and synchronisation:  Stringent requirements are imposed on jitter  Frequency synchronisation for FDD LTE + Phase and time synchronisation required for LTE-A  Synchronisation transported over CPRI Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 Optical fibre is needed for the fronthaul. Microwave links could be an option for some small radio site configuration.
  • 9. 9 France Telecom Group confidential Fronthaul: technical requirements  Fibre availability: – Already a requirement for LTE backhaul → 90% Orange France cell sites in dense areas have fibre – Max fibre length for D-RoF → 96% Orange France links shorter than 10km In urban areas up to 28 cell sites are connected to one CO (based on existing topology) Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 Distance RRH – Central office km Occurence
  • 10. 10 France Telecom Group confidential Fronthaul: Regulation issues In France and many other regulated countries: the fronthaul solution must be reproductible to any operators equipped by any vendors Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 technical aspects business aspects regulatory aspects RRH RRH RRH RRH RRH RRH Central Office BBU System module BBU System module BBU System module fiberproviderMobile operator Mobile operator demarcation point demarcation point  An adapted fronthaul wholesale offer is needed  BBU location is at stake  Fronthaul must be monitored:  by RAN ?  by dedicated fiber monitoring solution (specific device or embedded OAM)
  • 11. 11 France Telecom Group confidential Fronthaul : Active or Passive solution? RRH RRH RRH RRH RRH RRH Central Office BBU System module BBU System module BBU System module fiber providerMobile operator Mobile operator Active solution means CPRI traffic encapsulation by means of OTN or Eth+compression. Power supply needed at radio site demarcation point. Passive solution means fiber with monitoring without CPRI encapsulation. No need of power supply at radio site demarcation point. Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013
  • 12. 12 France Telecom Group confidential Dedicated Fiber CPRI • no extra equipment cost for transmission PRO’S • requires many fibers • extra equipment for monitoring CON’S When PtP fibres are available Fiber Monitoring Active part Fiber Monitoring passive part Optional fiber monitoring, B&W* SFP •B&W : Black and White mean very low cost bidirectional SFP using 1310 & 1550 nm multiplexing •SFP: Small Form Pluggable B&W* SFP B&W* SFP B&W* SFPs Dedicated Fibre Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 RRH RRH RRH BBU System module
  • 13. 13 France Telecom Group confidential Passive Coarse Wavelength Division Multiplexing (CWDM) CWDM CWDM CWDM Fixed color SFP Fits most capacity requirements • Few fibers • No active components on passive mux • High reliability • Suited for outdoor deployment • potential low cost for CWDM technology • No introduction of transport latency • up to 16 channels per fiber PRO’S • inventory management required to align optic color with RRH-BBU link • not bidirectional (2 fibers per link) • no native OAM CON’S passive devices CWDM Fixed color SFP CWDM Fixed color SFPs Passive WDM Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 RRH RRH RRH RRH CWDM Fiber Monitoring passive part Fiber Monitoring Active part BBUBBU System module
  • 14. 14 France Telecom Group confidential OTN/WDM (Optical Transport Network) OTN ODU Flex Mapped OTN •44/88/96 channels per fiber •bidirectional •High efficiency fiber sharing •Native OAM PRO’S • Risk on performance (latency, synchro) needed for CPRI • OTN network jitter based on mapper / demapper • CPRI rate dependent • power supply required • foot print • cost issue of OTN/WDM in access ? CON’S Future proof for phase and time synchro for LTE-A?B&W SFPsB&W SFPs Active WDM OTN Muxing (TDM & DWDM or CWDM) Aim – multiplex several CPRI clients in TDM and WDM OTN OTN Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 BBUBBU System module RRH RRH RRH
  • 15. 15 France Telecom Group confidential • Leverage existing access fiber plant • bidirectional • suited for small cell PRO’S WDM over FTTH infrastructure OLT G-PON FTTH ODN 1:64 Split Mux WDM DWDM Overlay on Enhancement bands (number of wavelength not already defined) CPRI 1310nm ONT NG-POn2 CPRI DWDM SFP Fixed Optic OLT NG-PON2 CPRI connected to ONT working at a dedicated DWDM (tunable Optic) Synergy with FTTH • Waiting for 2015 to have NG-PON2 equipment ready • DWDM device cost CON’S Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 BBUBBU System module RRH RRH
  • 16. 16 France Telecom Group confidential Name Description Avail. #Fibers on last mile Synchro & latency Integrated monitoring solution Dedicated fibre one fiber per RRH per techno Short term High Ok “Passive” (done by extra equipment) Passive WDM Colored SFP (RRH & BBU) CWDM or DWDM Short term for CWDM Low (2 to 4) Ok “Passive” (done by extra equipment) Active WDM Typ. OTN based (CPRI encapsulation) Short term Very low (1) Prelim. test Ok (freq. only) Part of OTN Passive + active WDM Passive CWDM + OTN Short term Low (2 to 4) TBC Passive + part of OTN Synergy with FTTH WDM // to GPON or integration in NGPON2 Long term FTTH infra reused TBC PON OAM (OMCI) CPRI over Ethernet CPRI I/Q encapsulated in Ethernet Long term Medium to High TBC Ethernet OAM (MEF) Fronthaul : short term vs mid/long term solutions Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013 TBC: To Be Considered
  • 17. 17 France Telecom Group confidential Conclusions and next steps Expected gains from BBU hostelling /C- RAN - Radio Site engineering improvements (footprint reduced, energy efficiency, less operations on site..) - Radio performance improvements and future proof for LTE-A - Transport: leverage future-proof infrastructure and concentrate complexity at CO level Technology short term possibilities -CWDM: good, simple, cost effective option with additional “passive” fiber monitoring for fronthaul -Synchronization performance to be assessed (especially phase/time) on some architectures (OTN, MW, FTTH)» Global architecture perspective - Hybrid Fronthaul/Backhaul solution required to address both macro & small cells - Structuring BBU location in Central office hierarchy - C-RAN to co-exist with regular RAN architecture - BBU in secured place  can get rid of IPsec Fronthaul at stake - Fronthaul offer is a keypoint for business case and strategy. - Regulation constraints strongly impact the technical solution Orange Labs Networks – LTE Backhaul Summit – A. Pizzinat – Amsterdam, June 25th 2013
  • 18. France Telecom Group confidential thank you Orange, the Orange mark and any other Orange product or service names referred to in this material are trade marks of Orange Personal Communications Services Limited. © Orange Personal Communications Services Limited. France Telecom Group restricted.

×