What do you mean by cell? – If not a biology student, you won’t be able to answer this question. If you have a minimum knowledge about biology, you will start to block my ear with the nutty definition which you successfully memorized during the so called glorious student life!
Then if I ask another question, name one modern invention of science which is kept alive by an invisible cell placed outside of its body? Funny question! Rocking chair!? Hey man, not a joke at all, it’s our mobile phone, always with us… so lets know this funny thing…
Mobile cell is an area of radio coverage from one BTS (Base Transceiver Station), you will find in your area commonly, the high rise towers as piercing the sky!
It is the smallest building block in a mobile network (think it’s as an interlinked spider web!) and is the reason why mobile networks are often referred to as cellular networks. Typically, cells are represented graphically by hexagons (oh! It’s an area covered by six same length hands without any gaps in between!)
Usually these cells are of main two types:
1. Omni Directional cell: An omni directional cell (omni cell) is served by a BTS with an antenna which transmits equally in all directions (360 degrees).
2. Sector Cell: A sector cell is the area of coverage from an antenna which transmits in a given direction only. For example, this may be equal to 120 degrees or 180 degrees of an equivalent omni directional cell. One BTS can serve one of these sector cells with a collection of BTSs at a site serving more than one, leading to terms such as two-sectored sites and more commonly, three-sectored sites.
Typically, omni directional cells are used to gain coverage, whereas sector cells are used to gain capacity.
The border between the coverage areas of two cells is the set of points at which the signal strength from both antennas is the same. In reality, this line will be determined by the environment, but fro simplicity, it is represented as a straight line.
If six BTSs are placed around an original BTS, the coverage area- that is, the cell- takes on a hexagonal shape.
This cell planning begins with traffic and coverage analysis. The analysis should produce information about the geographical area and the expected capacity. The types of data collected in this issue are: cost, capacity, coverage, Grade of Service (GOS), Available frequencies, speech quality, and system growth capability.
The geographical distribution of traffic demand can be calculated by the use of demographic data such as: Population distribution, Car usage distribution, Income level distribution, Land usage data, telephone usage statistics, and other factors, like subscription/call charge.
So? Got idea about the invisible cell? …