In a method of tracking a user in a communication network supporting a broadcast-multicast service, the network classifies groups of users into tracking areas. Movement of a user may be tracked as the user crosses a boundary between two tracking areas in the network. The method may enable a balance to...http://www.google.de/patents/US7480508?utm_source=gb-gplus-sharePatent US7480508 - Method for tracking users in a communication network
