Protocol Message Based Triggers
Last updated: December 3, 2008
Messages that assign downlink resources have a trigger associated with them that can fire on the first frame the MS is expected to start receiving data as a result of the downlink resource assignment. The Expected MS RX Trigger could be used to analyze data sent to a MS by connecting the MS to a logic analyzer. This could be useful to track MS software defects or wireless application communication issues. This trigger indicates when the test set expects the MS to start receiving data.
Messages that assign uplink resources also have an associated trigger that can fire on the first frame the MS is expected to start transmitting as a result of the uplink assignment. The Expected MS Tx Trigger could be used to ensure that a MS responds correctly to resource assignments and starts its transmission period in the correct place. The trigger output could be connected to a spectrum analyzer to initiate measurements on the frame in which the MS starts to transmit.
Each protocol message to which triggers are related may have more than one trigger associated with it. At the very least each message has an associated trigger that can fire on the frame used to transmit the message from the test set to the MS (downlink).
The protocol messages handled and the triggers associated with them are shown in the following table.
Protocol Messages and their Associated Triggers
|
Protocol Message |
Protocol Stack Layer |
Test Set Tx Trigger |
Expected MS Tx Trigger |
Expected MS Rx Trigger |
|
Packet Uplink Assignment
|
RLC/MAC |
Yes
|
Yes
|
|
|
Packet Downlink Assignment
|
RLC/MAC
|
Yes
|
|
Yes
|
|
Packet Timeslot Reconfigure
|
RLC/MAC
|
Yes
|
Yes
|
|
|
Packet Power Control/Timing Advance
|
RLC/MAC
|
Yes
|
|
|
|
Packet Immediate Assignment
|
RR
|
Yes
|
Yes
|
Yes
|
|
Identity Request
|
GMM
|
Yes
|
|
|
|
Attach Accept
|
GMM
|
Yes
|
|
|
|
Detach Request
|
GMM
|
Yes
|
|
|
|
Request PDP Context Activation
|
SM
|
Yes
|
|
|
|
PDP Context Activation Accept
|
SM
|
Yes
|
|
|
The Packet Timeslot Reconfigure and the Packet Immediate Assignment do not always assign uplink resources. The Expected MS TX Trigger will not be fired for occurrences where no uplink resource assignment is made.
All protocol message based triggers can only be used in the Active Cell operating mode. Any message based trigger will not fire in any other mode other than active cell.
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