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Zinwave-Mobile

Solutions for in-building The right in-building coverage solution will depend on the size of the structure and the user need Case There are a great variety of in-building wireless coverage MOBILE Zinwave special edition solutions available, ranging from single service, single-band technologies such as pico/femtocells and Wi-Fi to multi-operator, multi-service installations, such as distributed antenna systems (DAS). The right solution will depend on the building type and the user need. Currently there are four solutions which address poor in-building signal penetration: • Increase the power of a nearby macro base station; • Repeaters; • Pico-cells (cellular and Wi-Fi); • Distributed Antenna System (active or passive). Increase macro base station power The obvious solution may appear to be to increase the power of a nearby macro site. Unfortunately, this has effects on the MNO’s carefully planned wide area network, as it changes the cell-size and it can lead to other issues such as an aggravated near -far problem. Repeaters Repeaters allow the operator to extend the outdoor cell into the building without changing the macro network. As the repeater is fed from a macro cell via its donor antenna no additional costly network infrastructure needs to be installed in the building. However, repeaters do not provide any additional capacity and are generally suitable for small or medium buildings and tunnels only. Pico-cells Pico-cells are compact, standalone base station units with integrated radios and antennas, which are very well suited to provide additional capacity. They require a backhaul connection, but are operator and frequency/technology specific, while their capacity and range is limited. This means they are normally restricted to hotspot coverage, SoHo use and small buildings. Large buildings require many pico-cells, which leads to ver y high equipment costs. Distributed Antenna Systems (DAS) A DAS marries the benefits of the repeater and the pico-cell solutions. Extra capacity can easily be added by connecting a dedicated base station to the input ports of the central hub unit. But if only coverage is required, then the input to the DAS can be connected to the indoor port of a repeater. DAS products can be divided into passive and active solutions. Active DAS solutions are split into three types: narrowband, hybrid (a mix of passive and active elements), and wideband. Why active wideband DAS works best Zinwave argues that an active wideband DAS, such as the Zinwave 3000, is the perfect solution for operators looking to provide in-building coverage in medium to large buildings. The Zinwave 3000 is a fibre-based solution meaning it avoids the need to install coaxial cables – it can often simply use existing fibre in the building, thereby greatly reducing installation costs. Active fibre-based DAS systems also avoid the signal losses associated with passive DAS solutions. And being a low power system, the network will not suffer from signal interference caused by passive intermodulation (PIM) unlike passive DAS, which requires high power study Connecting patients and staff Erasmus MC Hospital in Rotterdam is the largest hospital in the Netherlands. It occupies a total area of 365,000m², employs over 13,000 personnel, has in excess of 1,320 beds and treats on average 500,000 patients annually. The hospital is also a level 1 trauma and disaster centre. Apart from going through extensive re-development, the hospital was also chosen to be a special coverage location centre point for the emergency services. This meant that a robust C2000 (TETRA) network was needed in all departments and a 20-storey communications tower was built to support the TETRA frequency bands used by the fire, police and ambulance services. Coverage tests carried out during the initial construction phase revealed, however, that TETRA output on the existing network was low to non-existent. The hospital therefore went out to public tender for the provision of an in-building wireless solution for its PMR network. It also took the opportunity to incorporate all commercial frequencies in the tender, so it could offer optimised mobile coverage to patients and staff. Erasmus Hospital chose Radio Access BV, a leading Dutch systems integrator, to install and commission


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