Architecture and transport for mobile broadband backhaul. Kåre Gustafsson Ericsson Research

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1 Architecture and transport for mobile broadband backhaul Kåre Gustafsson Ericsson Research

2 outline Technology and market drivers Link technologies Backhauling of Heterogeneous Networks Main remote connection technology Sync issues in mobile broadband backhauling Summary Public Ericsson AB Page 2

3 Introduction Architectural view of scope Radio Transport Radio Reference network Site Infrastr. Microwave Site infrastructure BSC 2G BTS BTS SIU Copper Metro Ethernet RNC 3G Node B Fiber CPG BTS LTE enodeb RBS Site Mobile Backhaul Switch/core site MME Public Ericsson AB Page 3

4 Millions Radio Drivers for transport network modernization 10,000 Subscription forecast 1, GSM WCDMA LTE Public Ericsson AB Page 4

5 The Beginning of Mobile Broadband Traffic per RNC, Growth factor sep 07 nov 07 jan 08 mar 08 maj 08 jul 08 sep 08 nov 08 jan 09 mar 09 maj 09 jul 09 sep 09 nov HSPA Voice Date Mobile Broadband will require packet technologies Mobile Both Broadband in Radio will and require in Mobile packet Backhaul technologies Both in Radio and in Backhaul Speech traffic DCH Packet traffic HS Packet traffic CS64 traffic Others traffic Total traffic Public Ericsson AB Page 5

6 Percentage of Cell Sites The Backhaul Situation Globally 48% micro wave 37 % fiber 15 % Copper 100% 80% 60% Global L1 Backhaul Technology Forecast Fiber Copper Large regional variations Fiber common in China, Korea, Japan Microwave dominant in India and strong in Europe Copper dominant in US 40% 20% Microwave 0% End 2007 End 2008 End 2009 End 2010 End 2011 End 2012 End 2013 Variations depending on operator type Incumbent has own backhaul and access to L1 control of delay Non-incumbent rents backhaul and has access to L2 less control Microwave Ethernet and Fiber dominate new macro installations Public Ericsson AB Page 6 Source: heavy reading

7 TRANSFORMATION SCENARIOS towards packet transport Connections TDM TDM only PDH, SDH, NG-SDH, Ethernet/PDH Ethernet introduced to new sites ATM phase out Hybrid Native TDM, Native Ethernet TDM phase out Packet only Native Ethernet, CES(TDM) TDM TDM transport transport Ethernet transport Time Public Ericsson AB Page 7

8 outline Technology and market drivers Link technologies Backhauling of Heterogeneous Networks Main remote connection technology Sync in mobile broadband backhauling Summary Public Ericsson AB Page 8

9 High capacity microwave links 1 Gbps, 2,5 Gbps and higher can be reached Future-proof microwave solution for LTE and LTE-Advanced Optical Ethernet interface 70/80 GHz channel (E-band) FDD RF interface Live Gb test link has been running for 1,5 years Microwave capacity will not be a bottleneck Public Ericsson AB Page 9

10 Bitrate Mbit/s Bitrate Mbit/s Bonded and vectorized VDSL2 VDSL2 can reach 500 Mbps over 600 m using bonding and vectoring technologies Bitrate on Line 1 Bonding rate Vectoring No Vectoring Reach (m) Reach (m) Existing Cu infrastructure can handle high capacities Public Ericsson AB Page 10

11 outline Technology and market drivers Link technologies Backhauling of Heterogeneous Networks Main remote connection technology Sync in mobile broadband backhauling Summary Public Ericsson AB Page 11

12 When to Do What? Enhanced macro site Most straightforward - first step Uniform capacity and coverage Limited potential More dense macro layer Long term solution for uniform coverage and capacity enhancements Limited by site availability Higher area capacity Higher data rates Additional low-power nodes Especially for non-uniform traffic demand Avoids need for additional macro sites Very high capacity Very high data rates Public Ericsson AB Page 12

13 Heterogeneous networks Different approaches Conventional Pico RBS Main part of processing locally at pico site Conventional backhaul (copper, fiber, - wave, ) Relay Main part of processing locally at pico site Backhaul using cellular radioaccess/spectrum Backhaul consumes cellular spectrum RRU Pico processing Mainly radio at pico site, main part of processing centralized (e.g. at macro site) High-speed fiber-based backhaul Public Ericsson AB Page 13

14 Wireless backhaul? Densification of radio networks will happen ~2015 and beyond. Many bottlenecks in MBB networks cell edge and uplink capacity indoor coverage Heterogenous radio networks Initial deployment of macro for coverage Pico and relay basestations for incremental capacity growth and extended coverage Order of 100 meters inter-site distances Fast roll-out of pico relays, with later roll-out of dedicated transport to the highly loaded relays. Hierarchical radio structures to handle inter-cell interference and resource management Pico cell W Low delay required on X2, and time/phase sync Pico cell Y Pico cell Z Macro cell Pico cell X Public Ericsson AB Page 14

15 outline Technology and market drivers Link technologies Backhauling of Heterogeneous Networks Main remote connection technology Sync issues in mobile broadband backhauling Summary Public Ericsson AB Page 15

16 Use case for main-remote connection over GPON infrastructure RRU LTE RRU RRU RRU Central Office Main-remote solution 1 2 MU λ converter FTTH Central GPON Node BBA CWDM MUX/ DEMUX 1 4 {1 4; BBA} Optical Fiber carrying GPON and M-R traffic Add drop 3 4 drop Add/drop traffic to/from RRU:s λ converter Ethernet switch BBA MUX/ DEMUX Public Ericsson AB Page 16

17 Main-remote connections over gpon Infrastructure Converged Access Network Distributed Split RRU :8 1:4 10G ONT MU OLT 10G ONT WBF WDM High speed fixed & mobile access infrastructure convergence using GPON to support: Fixed residential and business FTTH users Bonded VDSL2 over GPON connections CPRI MU-RRU links for RBSs RRU-W Video Server Video Server 10G OLT MU CN RBS VDSL2 CPE DSLAM Router Iub Public Ericsson AB Page 17

18 outline Technology and market drivers Link technologies Backhauling of Heterogeneous Networks Main remote connection technology Sync issues in mobile broadband backhauling Summary Public Ericsson AB Page 18

19 Importance of synchronization in Mobile Backhaul Synchronization (frequency, time-phase or both) is a key aspect in mobile broadband backhaul networks to support: the services carried over the packet network (including proper interworking with legacy TDM networks) the end-application operations, such as radio base stations. Radio Transport Radio Reference network Site Infrastr. Microwave Site infrastructure BSC 2G BTS BTS SIU Copper Metro Ethernet RNC 3G Node B Fiber CPG BTS LTE enodeb RBS Site Mobile Backhaul MME Switch/core site Public Ericsson AB Page 19

20 Sync Technology Highlights SyncE to become an established technology also in Mobile backhaul (frequency sync only, but may be used to aid IEEE1588 for time delivery). Some limitations in multi-operator scenarios Increased need to deliver accurate phase-time synchronization PTP (IEEE1588) being specified for Telecom Frequency Telecom Profile just released; time sync profile being discussed Access technologies are challenging environments to deliver accurate time due to intrinsic asymmetry (e.g. GPON ; xdsl) Sync solutions for CoMP, CPRI, wireless backhaul in heterogeneous NW requires careful analysis Scheduling coordination Joint transmission Coordination Public Ericsson AB Page 20

21 Summary - conclusions With the rollout of Long Term Evolution the capacity of the radio access network backhaul needs to be upgraded to Mb/s. Next generation mobile networks, such as LTE Release 10, will increase the requirement for backhaul capacity to gigabits per second. The need for increased capacity and decreased cost per transported bit drives packet-based mobile backhaul capacity boosts over microwave, copper and fiber. Backhaul link technologies will not be a bottleneck for Mobile Broadband Traffic. Variations of backhaul deployment depending on operator type Converged versus mobile only operator Possibility to use existing infrastructure (Fiber and Copper) Microwave Ethernet and Fiber will dominate new backhaul installations Proper sync solutions are one key aspect for a succesfull deployment of next generation mobile backhaul networks Public Ericsson AB Page 21

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