Mobile Telecommunication Networks
Principle of automatic reconnection

A mobile station communicates always with the nearest base station, more precisely with a station that provides the strongest signal for the mobile station. If the mobile station moves into a neighboring cell, it is automatically switched to the base station of the neighboring cell.

This operating mode is referred to as a handover.

The handover manages a change of a current serving station to a proper target station during user’s movement across the cells boundaries. The major purpose of handovers in mobile networks is to ensure continuous connection with high QoS or balance load in network.

Tracking of current position of mobile station in the network enables continuous automatic connection established between the mobile and base station. This indication is stored in the mobile network registers, which allows routing of connection to the called party directly into the area where the station is currently located.

On the basis of frequency planning communication channels with different frequencies in the adjacent cells are always used. When the mobile subscriber moves across the border lying between two different cells, it is always necessary to retune user’s mobile station.

Principle of handover

Basically, two types of handovers can be distinguished: