Keysight E6640A, Measurement Applications User & Programmer Reference

Page: 1723 / 2870

12 Code Domain Measurement
Meas Setup
7, when [:SENSe]:CDPower:SYNC:SYMBol:SRATe =480000
3, when [:SENSe]:CDPower:SYNC:SYMBol:SRATe =960000
Initial S/W Revision Prior to A.02.00
Primary Scramble Code (BTS only)
Sets a numeric value for the primary scramble code for synchronization.
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Autodetect - The analyzer autodetects the primary scramble code. The result is also available using
SCPI command, READ/FETCh:CDP19?Available only when Sync Type for BTS is SCH or CPICH and
Capture Interval is equal to or more than 1 frame. When Autodetect is not available, the result as detected
primary scramble code is not valid. When in the Manual mode, “---“ is shown in the bracket of the
Autodetect soft key.
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Manual - You can specify the value for the primary scramble code. The range is 0 to 511.
If the Device is set to MS, this label changes to Slot Format to define the DPCCH pilot pattern to
synchronize with. It allows you to enter either 0 or 2 slot formats.
The BTS scramble code number (Down Link) is determined by “Primary Scramble Code”, “Scramble Code
Offset” and “Scramble Code Type”.
The following information is an excerpt from TS25.213 Section 5.2.2 Scramble Code.
A total of 218–1 = 262,143 scrambling codes, numbered 0…262,142 can be generated. However, not all
the scrambling codes are used. The scrambling codes are divided into 512 sets each of a primary
scrambling code and 15 secondary scrambling codes.
The primary scrambling codes consist of scrambling codes n=16*i where i=0…511. The i:th set of secondary
scrambling codes consists of scrambling codes 16*i+k, where k=1…15.
There is a one-to-one mapping between each primary scrambling code and 15 secondary scrambling
codes in a set such that i:th primary scrambling code corresponds to i:th set of secondary scrambling
codes.
Hence, according to the above, scrambling codes k = 0, 1, …, 8191 are used. Each of these codes are
associated with a left alternative scrambling code and a right alternative scrambling code, that may be
used for compressed frames. The left alternative scrambling code corresponding to scrambling code k is
scrambling code number k + 8192, while the right alternative scrambling code corresponding to scrambling
code k is scrambling code number k + 16384. The alternative scrambling codes can be used for
compressed frames. In this case, the left alternative scrambling code is used if n<SF/2 and the right
alternative scrambling code is used if n≥SF/2, where cch,SF,n is the channelization code used for non-
compressed frames. The usage of alternative scrambling code for compressed frames is signalled by
higher layers for each physical channel respectively.
Primary Scramble Code corresponds to i (i=0 … 511), Scramble Code Offset corresponds to k (k= 1 … 15:
Secondary Scramble Code, 0: Primary Scramble Code) and Scramble Code Type Left and Right correspond
+8192 and +16384 offset respectively.
Key Path
Meas Setup
W-CDMA & HSPA Measurement Applications Reference 1723