Initial Design of WCDMA Network
After you have defined the requirements for coverage and capacity, the first step in the planning of the internal network is to make an initial assessment of which roofing solution to use. To determine the components of the solution radio, locations macro cell should be analyzed to see if you can find a dominant macro cell, either directly or as a donor of a radio repeater. Two conditions largely determine whether the building can be served by the macro: the location of the site of service and the type of coverage defined.
Along with a typical statistical RF propagation model, bPLS table defines the maximum that can be overcome by distant sites. These distances or bPLS will change significantly depending on the local conditions.
To drive a repeater by a macrosite existing, the main requirement is a view LOS to a single donor, which would involve both the signal strength and signal quality donor (SNR and Ec / No). If no dominant portion macrocell is available, a cell dedicated standalone (macro, micro or pico) is the only option radio system for feeding the antenna system next.
Although a dominant serving cell exists, before a repeater indoor or dedicated cell is chosen, expected the traffic to be generated inside the building, and the loading of the donor site are first evaluated. A repeater is suitable for situations of light load, which allows multiplexing of traffic on macrocell donor. A4Grnatively, a dedicated-cell in the last analysis, a standalone node-B provides additional capacity to the network instead of sharing the capacity macrocell.
If the internal traffic can not be estimated with precision, you might start with a repeater as a temporary solution, then move to a specific cell, when the internal traffic grows or becomes better determined. This approach does not preclude the choice of an antenna system, and upgrading from a repeater to a picocell requires no modification to the antenna system.
However, from a repeater is not always possible, depending on the power requirements of the antenna system. The first step in selecting an antenna system is to determine which option is suitable for the entire area to be covered. To evaluate the area, we must obtain and analyze construction drawings and schematics system before making a site visit. All regions, they must be classified into different categories of coverage with different priorities.
The categories should follow the documentation requirements for hedge accounting: great importance for the areas to be covered for all services, media for the areas to be covered for basic services, and low for the areas where coverage is not required. After all zones have been classified, one can estimate the type of antenna and the number of nodes required antenna, according to the size of the internal areas that macrocells do not cover. We can also calculate the input power on the antennas.