In this tutorial, we are going to learn about Cellular Network.
Cellular Network – It is a radio network distributed over land areas called cells each served by at least one fixed location transceiver known as cell site or base satiation.
Voice + Data
Main Point of Cellular Network:
- A cellular Network telephone system provides a wireless connection to the PSTN for any user location within the radio range of the system.
- Cellular System accommodates a large number of users over a large geographic area, within a limited frequency spectrum.
- This system provides high service which is comparable to that of the landline telephone system.
- High capacity is achieved by limiting the coverage of each base station transmitter to a small geographic area called a cell so that the same radio channels may be reused by another base station located some distance away.
- A sophisticated switching technique called a handoff enables a call to proceed uninterrupted when the user moves from one cell to another.
Cellular Network Architect:
- As per image show the basic cellular system which consists of mobile station (MS), base station (BS) and a mobile switching centre (MSC).
- The mobile switching centre (MSC) is sometimes called a mobile telephone switching office (MTSO), since it is responsible for connecting all mobiles to the PSTN in a cellular system
- Each Mobile communication via radio with one of the base station and may be handed off to any number of base station throughout the duration of a cell.
- The Mobile Station (MS) contains transceiver, an antenna and control circuitry and may be mounted in a vehicle or used as a portable handheld unit.
- The Base Station (BS) consists of several transmitters and receiver which simultaneously handle full duplex communications and generally have towers which support several transmitting and receiving antennas.
- The base station serves as a bridge between all mobile users in a cell and connects the simultaneous mobile call via telephone lines or microwave link to the MSC.
- The MSC coordinates the activities of all of the base stations and connects the entire cellular system to the PSTN.
- A typical MSC handles 100000 cellular subscribers and 5000 simultaneous conversations at a time, and accommodates all billing and system maintenance function as well.
Advantage of Cellular Network:
- Increasing Capacity
- Reduced Power Use
- Larger Coverage Area
- Reduced Interference from other signals.