BridgeWave Communications Small Cell Backhaul Options 4GWE Keynote Session – Small Cell Backhaul Options September 13, 2011

New 4G Paradigm Mobile networks up to 3G focused on coverage not capacity Macro-cell approach was adequate, 3-5 km radius Access = 100Mbps Aggregation = 300 Mbps 4G is all about capacity 10-100 Mbps to handsets 170 Mbps per LTE sector Higher backhaul rates needed e.g. 1 Gbps Data rates to devices affected by distance from base station Ubiquitous, high speed coverage requires divergence from macro-cell model 4G 2

Small-Cell Drivers To meet 4G capacity needs, higher base station densities are required The only way to achieve this economically is to deploy small and inexpensive cells around the macro-cell

Small Cell Backhaul Challenges Deployments required in diverse locations Large number of nodes required due to coverage needs Environment & Aesthetics High capacity – up to 1 Gbps Low cost (CAPEX & OPEX) Short deployment lead time

Small Cell Backhaul Options Fiber Likely to address < 30% of small cell locations Copper Not enough copper pairs available to most locations Wireless <6 GHz (NLOS) Unlicensed (2.4/5.8 GHz) subject to interference Licensed – scarce and expensive resource (access) Microwave frequency band (6 – 38 GHz) Licensing and equipment cost Regulated min antenna size Limited capacity ….what about millimeter wave?

Spectrum for Backhaul 6 - 38 GHz (licensed) 60 GHz unlicensed (free) Per link license typically $2K fee Long distance 6 GHz up to 50 miles, 38 GHz up to 3 miles Optimized for speeds up to 350Mbps per channel 60 GHz unlicensed (free) Excellent for short distances (1/2 to 1 mile) Gigabit speeds and urban environment friendly 70/80 GHz (lightly licensed) Per link license <$100 Optimized for Gigabit speeds up to 2 miles Traditional MW Frequencies MMW Frequencies

mmW Propagation 60GHz: 80GHz: Neither is impacted by: Absorption of O2 ~14dB/Km 1-2Km for 1Gbps links @5’9s 80GHz: 2-4Km for 1Gbps links @5’9s Neither is impacted by: Selective fading (multipath) due to relatively short links Fog (<0.4dB/Km) 60 GHz Excessive rain 150mm/h Heavy rain 25mm/h Fog Drizzle 0.25mm/h 80 GHz

mmW Directivity High gain and narrow beam-width achieved with small antennas Typical examples: Implications: Security High interference immunity High frequency reuse Comparison of beam width @ 1 mile: 5.8 GHz 24” 60 GHz 10” 5.8 GHz = 1,140’ wide @ 1 mi 60GHz  5mm 5” antenna 3dB / GA 1.0 / 35dBi 10” antenna 3dB / GA 0.5 / 40dBi 60 GHz = 128’ wide @ 1 mi 8

The Aesthetics Challenge Traditional parabolic antennas are OK for rooftop/tower/mast deployment Street-level deployment requires a different approach: Aesthetic Concealed / disguised Small footprint

Why 60 GHz for Small Cell Backhaul? Ultra-High Capacity Abundant spectrum available Low Cost Equipment enabled by new consumer indoor applications OpEx and recurring fees (e.g. license) Robustness O2 effect Antenna directionality Excellent frequency reuse Good fit for urban environment Aesthetic, “concealed” solution Small footprint 10

Picohaul Form Factor 4” diameter “pipe” delivers 1 GBps up to ½ mile < 3o beam width > 30 dBi gain Alignment hardware built-in Stackable Can incorporate RAN antenna Future-proof design Migrate to electronic alignment 11 © BridgeWave Communications Confidential and Proprietary www.bridgewave.com | 1-866-577-6908 1-408-567-6900

Mounting Options Same Gbps backhaul solutions - multiple mounting options A: Top of pole B: Side of pole C: BTS Top or inside D: Side of building (wall mount) © BridgeWave Communications www.bridgewave.com | 1-866-577-6908 COMPANY CONFIDENTIAL 12 12 © BridgeWave Communications Confidential and Proprietary www.bridgewave.com | 1-866-577-6908 1-408-567-6900

Usage Models Macro-cell Level Pico-Cell Level Rooftop Level Macro-cell Street Level Pico-cell 13

What about line of sight? 30% of links in urban areas will not have LOS NLOS solutions will be required Millimeter wave superior when LOS is available NLOS can be mitigated by planning Daisy-chain, Mesh or Ring topologies © BridgeWave Communications www.bridgewave.com | 1-866-577-6908

BridgeWave Communications Focus: High-Capacity & 4G backhaul solutions Founded in 1999 Privately held 100 Employees Based in Silicon Valley, CA Clearwire 4G Backhaul, NYC Metro DC Police – Video Surveillance Backhaul Corporate Headquarters: Santa Clara, CA, USA

Over 12,000 Systems Deployed in 60 Countries Service Providers Enterprise Municipalities Healthcare Government Education

The High Capacity Market Leader U.S. FCC 70/80 GHz Registrations Data from 1/1/2011 thru 6/30/2011 based on FCC 70/80 GHz Registration Database © BridgeWave Communications Confidential and Proprietary www.bridgewave.com | 1-866-577-6908 1-408-567-6900 17

BridgeWave 4G Backhaul Solutions Focused on solving tough backhaul challenges facing next-gen networks Introduced FlexPort80 in 2009 – flagship carrier class product Introduced GigE microwave (18 – 23 GHz) multi-channel products – Q4 2010 Introduced 3 Gbps FlexPort80 solution – Q1 2011 Introduced 60 GHz PicoHaul – small cell backhaul solution – Q1 2011 Millimeter Wave Microwave PicoHaul

Thank You Amir Makleff President & CEO BridgeWave Communications For more information: White Papers: http://www.bridgewave.com/solutions/whitepapers.cfm Case Studies: http://www.bridgewave.com/solutions/casestudies.cfm Data Sheets: http://www.bridgewave.com/products/default.cfm BridgeWave Communications, Inc. 3350 Thomas Road Santa Clara, CA 95054 Sales: 1-866-577-6908 Fax: 1-408-567-0775 sales@bridgewave.com www.bridgewave.com BridgeWave Communications, Inc. 3350 Thomas Road Santa Clara, CA. 95054 U.S.A. Tel: +1 (408) 567-6900 Fax: +1 (408) 567-0775 www.bridgewave.com