TABLE OF CONTENTS The EVDO system operation is the set of tasks performed to complete key operations: initialization of information when the subscriber unit is turned on, monitoring of control information, and connecting to the system.
Initialization is the process of initially finding an available EVDO channel, synchronizing with the system and obtaining system parameters to determine the information requirements for access and communication.
Initialization phase begins when the access terminal first powers on. It initially looks to the user identity module (UIM) card for a preferred control channel list. If there is no list, the subscriber unit scans all of the available radio channels to find a control channel. The UIM card is optional. The same information can be stored in internal memory to the mobile device if it is designed with that capability.
During idle mode, the subscriber unit monitors several different control channels to acquire system access parameters, to determine if it has been paged or received an order, or to initiate a call (if the user is placing a call) or to start a data session (if the user has started a data application).
After obtaining the system parameters, the subscriber unit continuously monitors the broadcast channel for changes in system parameters, including system identification and access information. If the subscriber unit has discontinuous reception (sleep mode) capability, and if the system supports it, the subscriber unit turns off its receiver and other non-essential circuitry for a fixed number of burst periods. The system knows that it...
