A-GPS Pipe
A-GPS Message Pipe allows the test set to transmit GPS assistant data to the mobile station and fetch the A-GPS measurement results. To assist the mobile station with GPS location fix, PDDM (Position Determination Data Message) messages are transmitted between the mobile station and the test set via the DBM (Data Burst Message) transparently (the test set works like a pipe and does not check the message content). DBM messages can be sent on either the f-csch/r-csch or the f-dsch/r-dsch, depending on the call connection status (see
<Operating Mode> Status
):
-
If the call connection status is
Connected
, the DBM messages will be sent on f-dsch/r-dsch. In this case, both the test set and the mobile station can send or receive the DBM message immediately after the DBM is generated. This is much quicker than sending DBM message on the f-csch/r-csch.
-
If the call connection status is
Idle
, the DBM messages will be sent on f-csch/r-csch. In this case, a mobile station working in slotted mode can send or receive a DBM message only in the certain assigned slots.
If you want to do an A-GPS test with less time and more efficient using the A-GPS pipe, it is suggested to establish a call before sending or receiving PDDM messages.
To send messages using A-GPS pipe, you can use the GPIB command:
CALL:AGPSystem:PIPE:MTERminated:PDDMessage[:DATA]
To query the received A-GPS pipe message, you can use the GPIB command:
CALL:AGPSystem:PIPE:MORiginated:PDDMessage[:DATA]?
To clear the received A-GPS pipe message, you can use the GPIB command:
CALL:AGPSystem:PIPE:MORiginated:PDDMessage:CLEar
To query the A-GPS pipe message count, you can use the GPIB command:
CALL:AGPSystem:PIPE:MORiginated:PDDMessage:COUNt?
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