Mobility Management Location Management Handoff Management Mobile IP Mobility Management Traditional mobile communication applications were in two-way voice communication, text, emails and remote file downloading.
(total access communication system), and NMT (advanced mobile phone system).
In this scheme: we have non-priority, priority, and queuing handoff schemes for a single traffic system such as either a voice or a data system.
we assume that a system has many cells, with each having S channels. The channel holding time has an exponential distribution with mean rate . Both originating and handoff calls are generated in a cell according to Poisson processes, with mean rates O and H, respectively.
We assume here a system with a homogeneous cell. The focus is on a single cell (called the marked cell). Newly generated calls in the marked cell are labeled originating calls (or new calls). A handoff request is generated in the marked cell when a channel holding MS approaches the marked cell from a neighboring cell with a signal strength below the handoff threshold.
Has TWO databases: home & visiting
Step1: Decision is made for Hoff & Hoff is initiated (decision time algorithms)
Step2: Mobile terminal registers with the “new” visiting db via handoff announcement message (mobile controlled handoff). If n/w controlled/mobile assisted, the new db may be aware or expecting this message.
3. The new visiting db communicates with the home db to get subscriber profile & authentication.
4. Home db responds. The NEW db includes it in its list.
5.Home db asks the old db to remove it from list.
6. The old db redirect pkts if any and removes/flushes it from its list.
Support for route optimization
Ensure symmetric reachability between MN & its router at current location
Routing b/w overhead
Decouple from link layer
Need to manage tunnel soft state
Dynamic home agent address discovery
Mobile IPv4 & Mobile IPv6
Part of the In extension
NO YESKey features