Posts Tagged ‘cellular frequencies’
It is more and more common for first-responders, (Police/Fire/EMS), to demand reliable ubiquitous radio coverage to ensure the safety of the public, as well as their own. In many instances poor in-building radio coverage has a negative impact on first responders ability to communicate effectively in a crisis situation. The prevailing thought today is that “Mission-critical” coverage can no longer end at the hospital doorway, basement, or stairwell.
DAS is the acronym we use in the wireless industry for DISTRIBUTIVE ANTENNA SYSTEM (DAS).
A microcell is a cell in a mobile phone network served by a low power cellular base station (tower), covering a limited area such as a mall, a hotel, or a transportation hub.
A cellular network is a radio network made up of a number of radio cells (or just cells) each served by at least one fixed-location transceiver known as a cell site or base station.
A macrocell is a cell in a mobile phone network that provides radio coverage served by a power cellular base station (tower). Generally, macrocells provide coverage larger than microcell. The antennas for macrocells are mounted on ground-based masts, rooftops and other existing structures, at a height that provides a clear view over the surrounding buildings and terrain. Macrocell base stations have power outputs of typically tens of watts. The term macrocell is used to describe the widest range of cell sizes. Macrocells are found in rural areas or along highways. Over a smaller cell area, a microcell is used in a densely populated urban area.
Each frequency range has a band designator and each range of frequencies behaves differently and performs different functions. The frequency spectrum is shared by civil, government, and military users of all nations according to International Telecommunications Union (ITU) radio regulations.
For communications purposes, the usable frequency spectrum now extends from about 3Hz to about 300GHz. There are also some experiments at about 100THz where research on laser communications is taking place but we won’t discuss this now. This range from 3Hz to 300GHz has been split into regions.