Quiz Entry - updated: 2026.07.14
What is mobility from a network perspective, and what is the spectrum from no mobility to high mobility?
Mobility is a core challenge of mobile communication — it means devices change their location, requiring the network to track and maintain connectivity as they move.
The mobility spectrum:
| Level | Description | Example |
|---|---|---|
| No mobility | User is stationary, always on the same access point / base station | Desktop PC on Ethernet |
| Medium mobility | User moves between networks, but each change drops the connection and rebuilds it — no seamless continuity | Switching between separate Wi-Fi networks; an active session restarts |
| High mobility | User traverses multiple access points / networks while connections are maintained simultaneously (seamless) | Phone call while driving on the highway |
The challenge increases with mobility:
- Higher network overhead — the network must constantly track where the device is
- More complex functionality — handovers, re-registration, routing updates
- Greater user comfort — no dropped connections, seamless experience
The concept of a "home" is crucial: just like a postal address, a mobile device needs a permanent, well-known address (its home network) so that others can reach it, regardless of where it physically is right now.
Go deeper:
Mobility management (Wikipedia) — how a real network tracks a moving device via location/tracking areas and paging, the overhead that grows with mobility.