60.2.2 Setup of CPICH Scan: PCTel

The set of scrambling codes to scan on each UARFCN is composed in one of two ways:

user-defined, static set of scrambling codes, common to all UARFCNs

strongest scrambling codes ("Top N")

What settings are supported by the various PCTel SeeGull models appears from the table in section "Scanning Methods and Capabilities". Only settings supported by the connected scanner are displayed in the dialog.

Type of Scanning

See also the introduction of this section.

Scan selected: Choose this to scan a static set of scrambling codes on all UARFCNs defined under Channels. The same scrambling codes will be scanned on the CPICH and on the P-SCH and S-SCH. Up to 128 scrambling codes can be selected.

Scan strongest: Choose this to have the N strongest scrambling codes reported from the chosen UARFCNs. The scanner automatically finds the strongest scrambling codes.

Number of Pilots

This field appears if Type of Scanning is set to "Scan strongest". To scan the N strongest scrambling codes, enter the value N here (N â‰¤ 32).

Selected Numbers

This field appears if Type of Scanning is set to "Scan selected". Enter the scrambling codes you want to scan.

PN Threshold

This is a signal code power threshold (in dB) used for the aggregate Ec/I0 and delay spread measurements (see section "Presentation: "CPICH Data" Status Windows").

If the PN threshold is set too low, the aggregate Ec/I0 and delay spread values will be affected by random noise more than may be desired. By raising the threshold you reduce the influence of random noise correlations, and you will thus be able to discern multipath and fading effects more accurately. The setting –20 dB is recommended.

Remaining Measurement Points

See section "Notes on Scanner Multitasking".

Data Mode

It is possible to reduce the amount of data that is presented and recorded:

Full means no reduction.

Sub means that some data is not presented or recorded.

It should be noted that choosing "Sub" results in a much faster updating of scan presentations. The precise meaning of "Sub" depends on the scope of the scan:

For "Scan selected", Time Offset, P-SCH Ec/Io, S-SCH Ec/Io, and Rake Finger Count are excluded, as is SIR. (The "SIR" field is disabled in this case.)

For "Scan strongest", only P-SCH Ec/Io and S-SCH Ec/Io are excluded.

SIR

Setting this to Yes causes the scanner to deliver the information elements "Sc ... SIR".

System Information

Setting this to Yes causes the scanner to decode System Information blocks (continuously). With this option selected, a maximum of 16 scrambling codes can be scanned.

From the SIB decoding are extracted the information elements "Sc ... Intra-freq Cells".

Measurement Mode

There are two choices, High Speed and High Dynamic. These are two algorithms with different priorities:

High Dynamic puts the emphasis on accuracy. Each sample reported by the scanner is typically based on a measurement 20 ms in length.

High Speed is faster and accordingly less accurate. Each reported sample is typically based on a 10 ms measurement.

Dwelling Time

The length of time the scanner dwells on each scrambling code (cell) trying to decode System Information blocks, before moving on to the next cell. Given as a multiple of 40 ms. The default is 50 = 2000 ms.