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Mobility management aspects of a system engineering deals with the capabilities and functions performed by a mobile communications network for enabling the continuation of the current communication services being in use by a moving user. It also deals with keeping track of the current location of a mobile user so that the network could reach and alert the mobile device for an incoming call at any point in time. Other situations where mobility management functions are needed are as follows:

Figure 2.14 Mobile communications network systems engineering.

 Whenever a mobile device is switched off and on again in the same area or different service areas.

 The current state of the mobile device, i.e. idle and active and their transition.

5G system mobility management system engineering aspects are described later in Chapter 18.