现在该系统可提供预付费业务、移动虚拟专用网业务和通用接入码业务。
The system provides prepaid services, mobile VPN services and universal access number services.
为了保证授权过程的安全，设计了一种散列码标识的方案，作为接入点识别移动台的根据，同时采用提前认证等手段提高切换过程的速度。
Hash Marking method was proposed to mark the mobile node and to ensure the security of authorization. In addition, pre-authentication method was used to reduce hand-off time.
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