An enhanced intersystem location management scheme based on user profile replication

Given the increasing demand for international roaming, it is very important to manage the location of roaming subscribers efficiently and cost-effectively. When a user requires location registration in the roaming network, many signaling messages and database accesses are involved in the location registration between its home network and the roaming network. Therefore, we propose a new intersystem location management scheme to replicate roaming user's service profile at the mobility gateway. The analysis results show that the proposed scheme achieves lower signaling cost, database access cost and registration latency compared with the previous schemes.