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

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 2

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

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 4

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

The Issue of Unused Capacity

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 ?

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

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

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%

AltoPOD Summary Transmission Power O&M O&M Environmental Environmental 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 Power Transmission O&M Remote GSM Modem in Altopod Battery Charge Telemetry O&M O&M Green BTS Solar Powered BTS Environmental Environmental

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