WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
162
User Manual 1173.9657.02 ─ 11
In accordance with the 3GPP requirements, a change of the HS-SCCH is suspended
when the UE is scheduled in two consecutive subframes. This scenario occurs for an
inter-TTI distance of 1, provided that the number of HARQ processes is sufficiently
large. For 6 or more HARQ processes, the UE is continuously scheduled so there is no
change of the HS-SCCH.
For R5 connections (QPSK or 16-QAM) only one HS-SCCH is required.
For R7 and higher connections one HS-SCCH is required for QPSK, while two HS-
SCCH are required for 16-QAM and 64-QAM modulation. One of the two HS-SCCH is
selected for usage depending on the HS-PDSCH channelization codes.
Because of the complex selection rules, it is recommended to always use "Cyclic/Auto-
matic" for R7 and higher connections. For R5 connections all values can be used.
The following values are available:
●
No. 1 to 4
The UE ID is transferred on the selected fixed HS-SCCH.
●
Random
The HS-SCCH for each transmission is selected at random among the channels 1
to n (n = "Number of HSSCCH"). This setting can be used as a stress test for the
UE to check whether it can actually detect subframes irrespective of the HS-SCCH
carrying the UE ID.
●
Cyclic/Automatic
Cyclic
applies to a R5 connection. The UE ID is transferred on the HS-SCCH
sequence 1, 2,…, n, 1, 2,…, where n is the "Number of HSSCCH", see also
"Example for cyclic HS-SCCH selection (R5 connection)"
Automatic
applies to a R7 or higher connection. The UE ID is transferred on a
fixed HS-SCCH, selected as follows:
–
QPSK modulation: HS-SCCH #1 is used
–
16-QAM or 64-QAM modulation: Either HS-SCCH #1 or HS-SCCH #2 is used,
depending on the total number of assigned HS-PDSCH channelization codes
and depending on whether the first HS-PDSCH channelization code number is
even or uneven. See following table.
Table 2-28: HS-SCCH selection for R7 or higher, 16-QAM or 64-QAM
First HS-PDSCH Code Number
HS-PDSCH Channelization Codes
Even (2, 4, ...)
Uneven (1, 3, ...)
1 to 7 HS-PDSCH codes
HS-SCCH #1
HS-SCCH #2
8 to 15 HS-PDSCH codes
HS-SCCH #2
HS-SCCH #1
Option R&S CMW-KS411 is required.
Remote command:
Number of HSSCCH
Number of HS-SCCHs contained in the HS-SCCH set. A selected value n means that
the set contains the HS-SCCHs number 1 to n. See also
GUI Reference
深圳德标仪器
135-1095-0799