Step 4: Establish An Active Link With Mobile Station; Background - Agilent Technologies 8960 Series Programming Manual

Step 4: Establish an Active Link with Mobile Station

Step 4: Establish an Active Link with Mobile Station

Background

Call Connect/Disconnect Synchronization
When the control program requires that an active link be established/terminated between the mobile station
and the test set, the commands necessary to initiate the call connect/disconnect process are sent to the test set
(for a BS originated/terminated call) or to the mobile station (for a MS originated/terminated call). In either
case, synchronization is defined as the control program being able to empirically determine when the call has
been successfully connected/disconnected so that the control program can proceed, or being able to empirically
determine that the call has not been successfully connected/disconnected so that the control program can take
appropriate action.
The determination is made by monitoring the call state as the call connect/disconnect process progresses.
Call States
At any instant in time a call can be in one of the following states:
• Idle
• Setup Request
• Proceeding
• Alerting
• Disconnecting
• Connected
Setup Request, Proceeding, Alerting and Disconnecting are referred to as transitory states because the
amount of time which the call can spend in any of these states is limited by GSM protocol (that is, the call
transitions through these states, it is not allowed to stay in a transitory state forever).
If repeat paging is on it is possible for the call process to stay in one of the transitory states
NOTE
beyond the time specified by the GSM protocol timers.
The control program can directly query the state of a call with the CALL:STATus:STATe? query command,
which immediately returns the current call state (that is, Idle, Setup Request, Proceeding, Alerting,
Disconnecting, or Connected)
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