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advertisement feature Rohill offers Green TETRA


of integration. In fully active state, the Rohill TETRA Base Station consumes 25 per cent less than its closest competitor for the same RF output power.


Benefits Low power consumption and extended operating temperature of the base station deliver many benefits for the operator and the environment. Obviously, the lower power consumption


results in lower electricity cost. In addition, less heat and more tolerance to high temperatures reduce the need for cooling, also saving energy cost and lowering investments in air conditioning.


Bert Bouwers of Rohill accepts the award from TETRA TODAY editor Richard Lambley


R


ohill has won the Green TETRA Award for its entry “Power Saving Innovations” during the 2012 International TETRA


Awards ceremony held in the Savoy Hotel, London. According to the judges, Rohill deserved the Green TETRA Award by a wide margin for its “innovative technical approach to reduce base station power consumption”. Tese innovations include a highly optimized architecture for the base station hardware, and turning off the transmitter during unused traffic channel timeslots. Tis results in a much lower power consumption compared to the scenario of pro-actively switching off and on the transmitter for all timeslots simultaneously.


Principle of operation Every TETRA base station needs to deliver a significant amount of RF output power to provide wide area coverage. Most base stations for large networks are dimensioned to deliver 25 watts of output power per transceiver to the antenna, which requires even higher RF power before antenna combining. As a rule of thumb, a two carrier TETRA base station requires 700W watts for 2 × 25W of output power. Rohill has significantly improved power


efficiency by turning on and off the transmitter on a per-timeslot basis, resulting in immediate savings when not all TETRA timeslots are allocated for speech or data traffic. For the first carrier with the control channel, a reduced power level can be applied instead of switching off the transmitter during unused timeslots, making this solution also work for multi-site networks, for which roaming and handover require a fully active transmitter. Power consumption is furthermore optimized


by using modern components in the TETRA base station, providing a much higher degree


28 For the environment, the reduction of CO2


emission and lower pollution levels due to manufacturing and disposal of smaller backup batteries are relevant. Furthermore, low power consumption enables the use of solar energy.


Applications Tese advanced power saving features were included in the third-generation Rohill Base Station System (BSS), introduced in 2010. Although every network owner using this third- generation BSS technology will benefit from the innovations, two applications are most relevant. Te first applicable market segment is


medium-sized or large networks for government and public safety. Coverage of a large region or country requires a large number of base stations with varying capacity, depending on the location (urban or rural) and spare capacity required for incidents and backup. Mission-critical availability and capacity require proper dimensioning of base stations, which results in at least one extra carrier per base station for redundancy and loading when incidents occur in the coverage area of the base station. Te second applicable


market segment is railroads for transport of raw materials from mines, and oil pipelines in rural areas. Electricity from the grid is often not available on these site locations, or very expensive to provide. Solar panels or generators are an alternative, but the cost for investment increases almost linear with power consumption.


Power savings: an economical TetraNode base station by Rohill


TE TRA TODAY Issue 7 2012


Real savings Although climate change and limited resources are a concern for all people on our planet, real cost savings are often the driving force in adopting green technologies. To illustrate this, the potential savings are calculated for a regional public safety network consisting of 250 base stations with 2 × 25W of output power. With 40 per cent traffic requirement for 16 hours and 20 per cent during the remaining time, the Rohill BSS2 consumes 490W per base station in fully active state, and 130W with power- saving enabled. Te base station of the closest competitor consumes 640W in fully active state and approximately 400W when power-saving is enabled. On basis of the UK energy cost and


expected inflation rate, adopting Rohill BSS2 technology results in significant OPEX savings of €5.5 million over 12 years of network operation, even compared to existing base stations with power saving enabled. Tis increases to more than €10.4 million compared with base stations without power saving. In terms of CO2


reduction on basis of the UK carbon emission profile for electricity


sources, the Rohill BSS2 saves 7450 tons of CO2 compared to an existing base stations with power


saving enabled, and at least 14 073 tons of CO2 compared with base stations without power saving. While energy cost is a significant part of the


operation cost of any radio network, it is highly recommended to include this as an evaluation criterion when tendering new TETRA networks. At the TETRA World Congress 2012 in Dubai, you can find out yourself what cost savings and reductions of carbon emission are applicable to your own scenario, using the app on the iPad tablets available on the Rohill booth.


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