Sacch Report Measurement Descriptions; When Are Sacch Report Measurements Made - Agilent Technologies 8960 10 Series Reference Manual

SACCH Report Measurement Descriptions

SACCH Report Measurement Descriptions
July 12, 1999
When a call is established (the operating mode is active cell and the call status is not idle), the MS is required
to report on the SACCH logical channel. The reported results available from the test set are shown here:
• MS TX Level Reported
• TCH Timing Advance Reported
• RX Level
• RX Qual
• Neighbour Channel
• Neighbour RX Level 1
• Neighbour NCC 1
• Neighbour BCC 1

When are SACCH Report Measurements Made?

When the test set receives SACCH data from the MS, results are reported to the user in the SACCH Report
window (Call Setup screen), and the Neighbour Cell Report window (Cell Info screen). The results are reported
remotely with the CALL:MS:REPORTED commands. No mechanism is provided to turn off SACCH data
reports.
The SACCH reports are delayed, they reflect what the MS is actually experiencing. It is possible for SACCH
reported MS TX level results to be different than the cell power level due to limitations of the MS. The SACCH
reported TCH timing advance should eventually match the value in the Timing Advance field once the MS has
time to react.
SACCH data will report any time there is a downlink TCH and the MS is synchronized to the test set
transmitting a valid SACCH on the uplink.
:NEW? and [:LAST?] Queries
:NEW? queries hang until a new SACCH message is received by the test set. The MS issues data updates on
the SACCH every 480 ms, (4 frames).
Measurements made during this four frame period are averaged and the result of these averaged
measurements are reported by the MS during the next period. Measurements must be stable in order to give
valid (stable) results for a :NEW? query. Therefore, it may take up to three SACCH reports before a reported
value accurately reflects a change to any of its parameters. See Figure 1.
After changing measurement parameters, you must send three consecutive :NEW? queries to obtain stable,
accurate results. By querying :NEW? three times the value becomes stable for the second query, and
meaningful stable results are then reported for the third query. The results from the first two queries should
not be used.
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