managing opex and capex in small cell backhaul
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Managing OPEX and CAPEXin small cell backhaulDr John Naylon, CTO, CBNL
Small Cells World Summit, 4 June 2013
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Today’s agenda
1. How to break the ‘backhaul barrier’
2. Choosing from the backhaul toolbox
3. A simple TCO model for small cell backhaul
4. Multipoint microwave
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How to break the ‘backhaul barrier’
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The ‘backhaul barrier’: understanding the perception
• Can I even get backhaul at all these funny locations?
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Conviction
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The ‘backhaul barrier’: understanding the perception
• Can I even get backhaul at all these funny locations?
• Most operators will deploy small cells to increase the QoE for the end user by increasing network capacity. Can I get enough backhaul capacity at all these locations?
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Conviction
Capacity
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The ‘backhaul barrier’: understanding the perception
• Can I even get backhaul at all these funny locations?
• Most operators will deploy small cells to increase the QoE for the end user by increasing network capacity. Can I get enough backhaul capacity at all these locations?
• Will I be able to deploy small cell sites en masse at 10% the cost of a macro site?
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Conviction
Capacity
Cost
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How to break the ‘backhaul barrier’: conviction
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Documents use cases, backhaul requirements and backhaul solutions (4 wired and 8 wireless)
Key messages:
• Backhaul is NOT a barrier to small cell deployment
• Many technically feasible solutions for small cell backhaul exist
• Total cost of ownership will dictate optimal solution
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How to break the ‘backhaul barrier’: capacity
How much backhaul capacity do I need for a small cell?
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1 10 100Backhaul traffic generated, Mbps (log scale)
Source: ngmn.org Small Cell Backhaul Requirements
See cbnl.com/bursty for more details
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How to break the ‘backhaul barrier’: capacity
Pragmatic backhaul for small cells uses wireless technology as an “on-ramp” for fibre
81% of operators said wireless was the primary backhaul option for the last mile to small cells Source: Infonetics
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Wireless• Great availability at
small cell locations
• Capacity depends on chosen frequency
Fibre• Availability at small cell
locations uncertain
• Capacity unlimited to all intents and purposes
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How to break the ‘backhaul barrier’: capacity and spectrum
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Source: Frequency Band Review for Fixed Wireless Service, Ofcom
Sub 6GHz:1.54 GHz for licensed and unlicensed, fixed & mobile,access and backhaul
Microwave:16.4GHz for terrestrial fixed links
millimetre wave18.3GHz
UnlicensedLight licensed
Link licenced (PTP)Area licensed (PMP)
Area licensedUnlicensed
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Choosing from the backhaul toolbox
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Choosing from the backhaul toolbox
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Solution Spectrum available
Capacity fit
TV Whitespace ~ 0.2 GHz* Poor
Satellite ~ 0.5 GHz* Poor
Sub-6GHz licensed 0.5 GHz Marginal
Sub-6GHz unlicensed 0.3 GHz Marginal
Microwave multipoint 6.7 GHz Good
Microwave PTP 9.6 GHz Good
60GHz mm-wave PTP 6.8 GHz Good
70-80GHz mm-wave PTP 9.5 GHz Good
* variable
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Choosing from the backhaul toolbox: capacity screening
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Solution Spectrum available
Capacity fit
TV Whitespace ~ 0.2 GHz* Poor
Satellite ~ 0.5 GHz* Poor
Sub-6GHz licensed 0.5 GHz Marginal
Sub-6GHz unlicensed 0.3 GHz Marginal
Microwave multipoint 6.7 GHz Good
Microwave PTP 9.6 GHz Good
60GHz mm-wave PTP 6.8 GHz Good
70-80GHz mm-wave PTP 9.5 GHz Good
* variable
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A simple TCO model for small cell backhaul
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A simple TCO model for small cell backhaul
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We use this model to compare the microwave and millimetre-wave PTP and PMP solutions
that pass the ‘capacity’ screening criterion
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TCO comparison: multipoint v point-to-point
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Multipoint microwave
Point-to-point microwave/mm-wave
Bandwidth dynamically shared between links
Statically provisioned bandwidth for each link
At hub, shared radio and antenna for all links
At hub, dedicated radios and antennas for each link
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Compare TCO to backhaul 5 small cells: equipment
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SC
PoP
SCSCSCSC
Assume hub is 2× price of small cell end
Each additional small cell needs only the remote end of the link
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cost
Unit of cost = 1 radio transceiver. Assumes PMP and PTP radios are equally priced, which is valid for microwave comparison. Millimetre wave radios are currently ~2× price of microwave radios.Source: Maravedis-Rethink, Wireless Backhaul Market from an Intermodal Perspective
SC
SC
PoP
SCPoP
SCPoP
PoP
SCPoP Each additional small cell
needs equipment at both ends of the link (for star or chain configurations)
1 link per small cell site
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cost
Multipoint microwave
Point-to-point microwave
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Compare TCO to backhaul 5 small cells: installation
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SC
PoP
SCSCSCSC
Assume hub is 2× price of small cell end
Each additional small cell needs only the remote end of the link
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cost
Each new link to a site needs two teams and simultaneous access to each end of the link for alignment.
Assume this is 3× price of sending one team to one site
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cost
Link
Link
Link
Link
Link
Unit of cost = 1 site installation
Multipoint microwave
Point-to-point microwave
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Compare TCO to backhaul 5 small cells: site rental & power
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SC
PoP
SCSCSCSC
Hub site may have higher rental or power consumption than small cell site
Single antenna at each small cell site
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cost
Unit of cost = 1 year’s site rental and power
SC
SC
PoP
SCPoP
SCPoP
PoP
SCPoP Rent is per antenna, and
power consumption per radio, so each additional link incurs another two units
1 link per small cell site
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cost
Multipoint microwave
Point-to-point microwave
Commercial in confidence 20
0 1 2 3 4 5 6 7 8 9 10 -
20,000
40,000
60,000
80,000
100,000
120,000
Small cells per backhaul hub
5 y
ea
r T
CO
, N
PV
5 Year TCO Comparison
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0 1 2 3 4 5 6 7 8 9 10 -
20,000
40,000
60,000
80,000
100,000
120,000
Small cells per backhaul hub
5 y
ea
r T
CO
, N
PV
Conclusion— Microwave PMP can offer very significant TCO savings versus
microwave or (especially) millimetre wave PTP for small cell backhaul
— Spectrum rental and coordination costs are decisive
Consensus view is 3-5 small cells per macro in 5 year timeframe
PTP millimetre wavePTP microwaveMultipoint microwave
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Multipoint microwave
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VectaStar Metro – small cell backhaul solution
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Small cell multipoint microwave backhaul from the market leaders
• 600Mbps throughput
• 600µs mean round-trip latency
• SyncE, 1588v2 support
• 26GHz and 28GHz ETSI
Built on the established VectaStar platform
• Used by 7 of the 10 largest mobile operator groups in the world
• Deployed in 37 countries worldwide for 2G, 3G, 4G, Wi-Fi
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Summary• The backhaul barrier of ‘conviction’, ‘capacity’ & ‘cost’ –
has been broken
• Good end-user quality of experience requires much more backhaul capacity than there is low frequency backhaul spectrum
• Microwave and millimetre wave (PTP and multipoint), can all “do the job” for small cell backhaul
• Multipoint microwave for small cell tail links offers significant TCO savings through higher utilisation of equipment and spectrum
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Small cell backhaul: the big picture
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Pick up a copy of our new small cells white paper!
• Market progress• Deployment drivers• Styles of deployment• Backhaul requirements • Backhaul solution overview• Backhaul TCO analysis
Available from:
cbnl.com/smallcells