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Distributed Antenna Systems for Indoor Cellular Network
Some 70 – 80% of mobile traffic originates from inside buildings. This is especially true in urban environments where the focus of the mobile user is on high data rates. For mobile 3G network, only serving macro base station within a few hundred meters of the building can provide sufficient level of RF signal to support indoor voice/data services. In realty, only a few buildings will fall into this category. Soft handover in 3G network will further increase the traffic load on the network since each indoor mobile phone can be serviced by more than one macro cells (base stations). In order to provide indoor high speed mobile data services such as HSPA (High Speed Packet Access) or EVDO (Evolution – Data Optimized) services, the only solution is an indoor Distributed Antenna Systems (DAS).
DAS is used to distribute the RF signal evenly with sufficient strength inside a building to provide 3G voice and data services. DAS can be used to isolate the indoor network from the outdoor serving macro cells to eliminate the soft handover of the indoor mobile phone. This will reduce the traffic load and increase the speed of the 3G network. For HSPA high speed data service, indoor DAS can also provide isolation between serving and non-serving cells of the outdoor network. This means less co-channel interference in the HSPA serving cell and results in higher data rate for the HSPA service. To dominate the building with indoor coverage, directional antennas can be deployed at the edge and corners of the building and pointing towards the center of the building. The total indoor area is dominated by the indoor cell and at the same time minimizes leakage to the macro network.
T-Mobile Ameo cellular mobile phone Review
The unusual looking T-Mobile Ameo is produced to acquire the ultimate communications product for individuals near to the co, and appears like a mini lap best pc many thanks to its small detachable keyboard that clips onto the display part in the phone.
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