Roaming and Handoff are technical words in telecommunication world.Now a days these are very popular these words both in communication field and normal life.So knowlede with this simple technical word is very important.
* What is the roaming ?
When we going to knowing this roaming before we want to know basical telecommunication happening in a simple wireless device (Typically cellphone/Mobile).Mobile/cell phones are working with the help of radio signals.Electromagnetic Radio signal has very low frequencies.So they are using Cellular network system.In Cellular network system our earth is divided as different cells for making good quality of calls and data services.This Cell system will help to getting good quality of radio signal transmitting and receiving process.Modern mobile telephone services use a cellular networks So its name comes as cell phone.
When we are using mobile /cell phone our input data for example voice converts to electromagnetic signal.A microchip (Sim card) inside the phone will converts this electromagnetic signal number of strings (binary digits 0 and 1).This packed up numbers are mixed with electromagnetic signal are send to air by antenna.This signal will receive in local tower.This local tower will send our information to nearest Base station .From the base station, the calls are routed onward to their destination.Base station will help that signal to find out the destination phone.And basestation will send this signal to nearest tower located at destination phone.And this tower will receive the signal and this local tower will send this signal to destination point.And sim card decode the information in signal it will give output.
In roaming we are away from our base station so signal strength is very low.so our cellphone will try to connect nearest base station this one is not our home station .So cell phone is automatically founding base station nearer to cellphone. This process is known as hands off/handover.Simply our cellphone is handed over to another base station.So they will make some charges for this service.
Roaming is a general term that refers to the extending of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device keeps connected to the network, without losing the connection.