data
Case in point: Smart Grids for electrical power companies
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Smart Grid is an intelligent power distribution and generation system. It can sense system overloads and reroute power automatically to prevent or minimize outages. It can also respond autonomously to manage supplies quickly and efficiently. Smart Grids are changing the
landscape of power and energy business. Before, large systems provided power for a great number of users, but Smart Grids will make smaller-scale power generation and storage economically feasible. For example, solar panels or small wind turbines on the rooftops generate electricity; charging stations for electric cars store electricity locally. In the future, electricity
consumers’ power meters will be read automatically. The measurements will help the consumers’ appliances optimize their power consumption according
to tariffing. A growing amount of signalling will flow back and forth as the electricity grid is kept in balance, optimizing power generation and minimizing the use of non-renewable energy. How to transfer all this data for Smart Grids? Commercial wireless
networks do not meet the availability or security requirements; and until now, mission-critical radio networks such as TETRA did not have the ability to handle the required data volumes. Enter TEDS Direct Access. Power and energy companies can build a
dense network of miniature-size TEDS base stations, possibly with a single carrier. Such a network would be most cost-effective, because miniature base stations could be installed in existing facilities and cabinets. The cells would be small, requiring only small, cheap antennas, and frequencies could be reused, so the increase in capacity would fit into the available spectrum.
Case in point: emergency services at a major incident
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fire has broken out in a shopping mall. Arson is suspected. Units from police, fire and ambulance services need to co-ordinate their own operations and joint efforts. Data and information are in high demand: the command centre needs video footage from the scene of the fire, while the police units need to view pictures of suspects. Ambulance services deliver patient data to the hospital, and the fire chief assigns hydrants and entry points to the arriving units. The locations of all participants are updated frequently and shared. A joint mobile command post is being set up. Mobile phone networks are overloaded and
cannot reliably serve the people near the location of the fire. The public authorities use their mission- critical TETRA radio network, which continues to provide a great service. Now, let’s imagine that this TETRA network
supports TEDS Direct Access. Every police vehicle in the area can continue
updating its position data into the Automatic Vehicle Location (AVL) system, so that the police commander knows the precise location of every unit. A short video clip can also be sent to the command centre over TEDS. Using group addressing, the command centre can send a mug- shot of the suspected arsonist to everyone in or near the area. And there is enough capacity still for the fire field commanders and for the ambulances. Thanks to TEDS Direct Access, all this intensive
data traffic has not crowded the TETRA 1 channels for voice. The incident can be handled without risk of congestion.
14 TE TRA TODAY Issue 3 May 2011
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