Motivation
- Mobility:
- address migration (mobile IP, location management)
- location dependent information (where is closest printer?)
- migrating locality (optimal connection changes over time)
- Portability (of computing device):
- limited power supply (battery)
- data security (someone steals your laptop)
- small user interface (screen size of a PDA)
- limited storage capacity (disks might be considered as a “power liability”)
Solutions (or suggestions) exist to address all these issues, however, the solutions are often conflicting:
- do not keep data on portable device to reduce security problem
- do not send/receive data unless absolutely necessary to preserve valuable energy