关于USAT网络部分的设计

Design of USAT network part

USAT技术是在原来SIM卡被动式的操作模式基础上,增加了SIM卡新的主动式操作的能力,即允许SIM卡中的应用和服务主动与手机终端进行交互操作。在USAT技术获得广泛应用之前,手机与SIM卡之间是一种不对称的主从关系,即SIM卡只能处于被动的接受手机的指令并执行的地位,手机则处于绝对的主动控制地位。任何一个动作只能由手机发起命令,并由SIM卡响应来完成。这种命令—响应的动作模式最大的缺陷在于SIM卡不具有主动权,从而限制了在SIM卡上的开发,制约了新的移动增值业务的发展。而USAT则为SIM卡的增值业务提供了良好的开发环境,可在SIM卡中设计功能丰富、操作简便的菜单,使用户可以用可视化、交互式的手段享受移动运营商提供的增值业务。

USAT technology is based on the passive operations of original model of SIM cards and adds the proactive SIM function, which gives a mechanism and whereby the SIM can initiate interactions to be taken by the ME. Before the USAT technology is widely available, it is an asymmetrical relation between mobile phones and SIM cards, which means that the SIM cards can only receive the commands from the ME. The ME is at the absolute control position, and all actions can only be initiated by the phone and executed by the SIM cards. The biggest shortcoming of such action mode is that the SIM cards are all passives, thus restricting the possibilities of opening up and using new mobile value-added services on the SIM cards. The USAT can provide new mobile value-added services of SIM cards with good environment. The abundant functional and simple menu can be designed in SIM cards, and the users can enjoy the value-added services provided by mobile operators through visualization and interactive methods.