In a conventional in-building DAS system, units are connected in order of and eNB (or RRH), MU, HU, antenna and UE. eNB (or RRH) and MU can be located in an MDF room in buildings. HUs are usually mounted onto the walls on every or every few floors of a building while antennas are mounted onto the ceilings of rooms, conference rooms inside a building (see the figure above). For connection between eNB/RRH and MU, and between MU and HU, fiber cables are used while RF coaxial cables are used for connection between HU and antenna.
In a conventional DAS system, radio signals from eNB (or RRH) are delivered through fiber and RF coaxial cables to the antenna in a building near UE, but are radiated over the air from the antenna to UE. That is, instead of going a very long way directly from eNB (or RRH) to UE, signals travel securely through wired cables up to the antenna - the last point possible on wire, and the closest point to UE - but over the air from the antenna to UE. This minimizes the over-the-air travel distance of the signals, consequently resulting in better signal quality. And this way, the entire building can work as a cell itself, offering excellent signal quality (like there is no wall or ceiling that blocks signals).
Unfortunately, however, there is a critical issue with this system. It costs too much and takes too long to install, build and maintain indoor cablings, wireless infra (especially antennas), etc.
To compensate for these issues, HFR introduced uRadioTM.
New Remote Antenna Units (RAUs) that replace the existing antennas in DAS system come with built-in antennas and useful features that support radio network optimization-related functions (e.g. remote signal measurement and control function). And this eliminates the need to work manually and individually when building and maintaining an in-building wireless infra, drastically reducing costs and time required.
Other benefits of uRadio would be that, because it uses UTP-type data cables which are relatively cheaper than conventional RF coaxial cables, cabling costs can be reduced. Plus, because the new solution alone can accommodate not only LTE but also the existent WCDMA, it can further lower costs of building and maintaining a wireless infra.
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