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The present invention is a user process that resides in network nodes to act as an agent for mobile terminals in, for example, PCS environments. The user process handles negotiation and complex Signaling functions for the user, thus reducing the amount of Signaling traffic that must travel over the valuable air interface. To achieve low call estab lishment times the user proceSS is migrated as user move. Three embodiment is adapted to enable data sizes which are to be transferred to be optimized, leading to low overhead. This approach also provides flexibility when migrating acroSS heterogeneous environments. A Second alternative embodiment may be advantageously utilized when a pro gram is compute intensive and asynchronous migration is essential. The third embodiment provides high reliability in the form of checkpointing, but incurs a high migration delay and has high memory requirement for network …