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2. INTRODUCTION
2.1. PURPOSE
The MRx18 is a bi-directional amplifier used to enhance signals between a mobile
and a base station in a mobile network. It has been designed to increase signal
strength in small and medium sized areas such as offices, shops, and basements. By
boosting the signal level the MRx18 increases indoor coverage and allows high data
rate connectivity.
If weak signal transmissions occur within the coverage area due to indoor
applications, topological conditions or distance from the transmitter, a repeater is
used to extend transmission range. In the downlink path, the repeater picks up the
signals from a donor antenna of a BTS / Node B, amplifies and re-transmits it into the
required dark spot. In the uplink path the signal picks up the signals from a
mobile/UE and re-transmits it to the BTS/Node B.
2.2. THE MRx18
Andrew MRx18 gives designers a simple tool to solve their small area coverage and
performance issues.
The MRx18 is easy to install. Also a web-based browser simplifies to commission
and configure the equipment. The RF link (donor) towards the base station is
typically fed from an outdoor antenna while the coverage area is fed by an indoor
antenna. The possibility to adjust the passband of repeater helps to cover any
specific segment or frequency band.
Due to modular design the single varia version MRx18 may be available as a triple-
varia segment or a dual-band-varia version in one cabinet. Auto Gain functionality
enables automatic gain adjustment in order to maximize the performance, however,
gain may be set manually if desired. An alarm interface with a display and LEDs
indicates the status of the equipment locally. Moreover the status and alarms of the
MRx18 can be queried via the web-based browser. The MRx18 has an optional
remote monitor function that provides equipment alarming and basic configuration
settings via a GSM-SMS. Alarm SMSs (including heartbeat) can be sent to the
common Andrew OMC or to any standard SMS receiver (even a mobile phone).
Moreover the MRx18 can be connected to LAN.
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