**2.2.2 Accounting modes**

### **Fixed accounting**

According to the user's contract situation, fixed accounting makes user do not need to consider the service usage when he access to WiMAX to use all sorts of services. When the user's contract expires, the system will stop user from accessing the network. Fixed accounting includes the following four modes:


#### **Accounting based on services usage**

This mode is according to the services usage of user. There are three methods :


#### **Accounting based on services**

This mode is according to all kinds of the value-added services supported by operators . There are three possible methods:

