The visitor location database, home location database, and the authentication center are the major databases that are accessed by various processing elements in the network. A distributed database has been proposed for interconnection of MSCs throughout a wireless network.
Distributed Database for Mobility Management
- The distributed hierarchical database architecture has been proposed to facilitate the tracking and location update of the mobile subscriber.
Figure 8.11a hierarchical distributed database.
- Figure 8.11 shows the interconnections in a distributed hierarchical database
- The database partition at each access MAN node lists subscribers in the associated BSC control area
- Each of the BSCs is able to receive the MAN broadcast and updates its database if the mobile is in its region
- Higher level databases at the backbone MAN level enable subscriber tracking within these areas,
- The method of partitioning is an efficient technique for it reduces the time required to locate any mobile and hence minimizes the traffic congestion resulting from heavy broadcast traffic required to locate a roaming mobile
- Each subscriber to the cellular service has an associated home access MAN, backbone MAN, and a MAN database.
- Mobile subscriber is enlisted in a visitor database when it enters a foreign area and remains in the new database until it leaves that area.
- Whenever a subscriber leaves its home area, the databases are updated so that the home access MAN database will contain the new location of the roaming subscriber