**3. Concluding remarks**

In summary, it can be observed that the future network will have the following characteristics: IP-based, broadband, lower cost, more convenient to manage, and multiple technologies could integrate through a unified core network, achieving the the seamless switching between various services.

The core network of WiMAX adopts mobile IP framework, which provides the ability of seamless integration with all-IP network. It has following advantages:


In the next stage, WiMAX core network will gradually evolve towards IMS, adapting to the requirements of interconnecting with other network.
