16 March 2018

GSM handover

Definition of handover : 

Handover is the process of transferring a mobile station from one channel to another channel side.

This system can be defined as a mechanism to hand over the mobile device to the neighboring cell.

Basically, handover is a core element that can be planned and deployed cellular system based network. It must be efficiently done using different strategies.

In the handover process, if the mobile device moves out the range of one cell, a different base station provides it with a use of the stronger signal.

In this process, if the channel of the base station is busy then the nearby base station can provide service to the device.

Types of handover :

There are two types of handover :
  1. Hard Handover
  2. Soft Handover
1. Hard handover :
In hard handover, the radio link must be dropped for a small amount of time before it can be taken over by another base station.

So the call process not from only one base station (BS) to another base station but from current transmits to receiver frequency pair to another frequency pair. A break in call transmission is called as a call drop.

In general, the handover occurs in a very few milliseconds. The GSM system performs hard handovers.

2. Soft handover :
While in soft handover indicates an MS full form is a mobile station at the boundary of two adjacent cells does not call drop because of handover in the boundary region. 

A mobile can be connected easily to several base station (BS full form) is base stations simultaneously. The 3D CDMA support soft handover.