Bringing Mobile Connectivity to Remote Communities A Transmission & Power Efficient Solution

1. Bringing Mobile Connectivity toRemote CommunitiesA Transmission & Power Efficient Solution

2. What we do… We develop innovative software technologies to enable GSM operators to cost effectively extend their networks to small, remote communities. Our target markets have… • A subscriber potential of up to 1,000 • Where satellite is the only realistic backhaul solution • Where the power source is inevitably off-grid • Our specialism is satellite bandwidth optimisation and power efficiency - the main Opex barriers which have limited MNO expansion to remote territories to date

3. The OPEX Barriers for Remote Community Expansion Source: Supplied to Altobridge by African GSM Operator

4. Solving the Transmission Cost Challenge… Split Architecture™ Local Connectivity™ • Bandwidth On-Demand means no expensive ‘always-on’ requirement. • No revenue generating traffic = No bandwidth used • Bandwidth Optimisation means 5-8kbit/s per call or 35-56kbit/s per TRX • Ringtone Suppression – not allocating the audio path over satellite until the MO Call is answered – provides a further 25% bandwidth saving • Local Calls are Switched at BTS level • Voice Traffic is not backhauled • Only signalling traffic is carried over satellite • Local Call Traffic can account for up to 60% of total call traffic a Remote Sites

5. Solving the Power Efficiency Challenge… Case Study: A 2TRX Remote Site Deployment in SE Asia Site Profile: • A Remote Enterprise with 230 active subscribers • 5km coverage radius • Average Traffic per Day ~ 40 Erlang, BH Traffic ~5 Erlang • Power Consumption: 195watts • Total Power Consumption per day 4.680kWh • Power Source: Diesel generator

6. The Issue of Unused Capacity

7. Should Remote Sites not be Dimensioned Differently ? The Traditional Macro Network Approach: • Dimension for the Busy Hour • Add extra TRX capacity when TCH Blocking SLAs are reached But….. • Additional TRX demand additional power So… • Should the convention also be the norm for remote sites where power is a scarce and expensive resource and where at times of day, capacity greatly exceeds demand ie. at times of low or zero traffic ?

8. The Ideal Scenario • Idle the 2nd TRX at low traffic periods • Put the 2nd TRX & VSAT Modem into low power mode at very low or zero traffic levels

9. The AltoPOD™.… An Intelligent Power Management Solution • Low Opex, Low powered 2 TRX BTS • Dual PA: 10 Watts per TRX • Power consumption: 195 watts • Passive Cooling, Outdoor Unit • GPRS, EDGE and AMR Half Rate Supported • Optimised for satellite backhaul

10. Power Saving Attributes • Non optimised 2 TRX Altobridge Site: • 195 watts • 4.680kwh per day • Power Optimised AltoPOD 2TRX Site: • 6 hours @110 Watts • 12 hours at 130 Watts • 6 hours at 145 Watts = 3.09kwh per day • Estimated Saving from Intelligent Power Management =34%

11. Lower Power BTS • Lower Power consumption BTS • Intelligent Power Management • Intelligent Power Amplifier Management • Increase power per TCH • Place VSAT in low power mode in low traffic (0 Idle Traffic) • Traffic Handling to minmise 2nd TRX usage • Power Monitoring & Adaptation • Unique Monitoring of Power Supply • Allow optimal dimensioning of solar system • Physical • BTS located close to Antenna to minimise feeder loss • Passive Cooling • Split BSC • B/W Optimisation over satellite • Local Switching • Reduced B/W requirement as local calls are switched locally • O&M • Remote GSM Modem in Altopod • Battery Charge Telemetry • Green BTS • Solar Powered BTS AltoPOD Summary Transmission Power O&M O&M Environmental Environmental

12. Thank You Peter Tuomey ptuomey@altobridge.com www.altobridge.com