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Mobility Management in Wireless Networks: Data Replication Strategies and Applications (ERCOFTAC S.)

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In wireless communication systems, the network keeps track of a user’s
location through an up-to-date user profile stored in various databases.
A user profile contains not only a user’s current location information, but
also service information, such as billing and authentication. The coverage
area of an access network is divided into registration areas (RAs),
and each RA is associated with a location database. The two basic operations
in mobility management are location update and location lookup.
When a user moves across the boundaries of these RAs, the network
updates his location information in the pertinent databases. When a
caller places a call using the callee’s identification, the network queries
the relevant database(s) to obtain the current location and other service
information of the callee.

The performance of mobility management can be further enhanced
by using replicas of user profiles which may be kept at various locations.
Replication techniques make profile information more readily available,
thus reducing lookup cost and latency, but to keep these replicas consistent
and fresh, they must be updated whenever the user profile is
updated. The principle of replication is to replicate if the benefit of
replication is greater than its overhead. The difficulty, however, lies in
accurately measuring the benefit and overhead.

Much of the previous work on replication for mobility management
was threshold-based, where the benefit and overhead of replication are
simply approximated and thresholds are introduced to allow some error
margin in deciding where to replicate. Because of their dependency
on thresholds and traffic statistics, such threshold-based algorithms not
only evade performance analysis but also improvement.
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