Rohde & Schwarz SMW-K144 - Page 58

5G New Radio Configuration and Settings
R&S
®
SMW-K144
58User Manual 1178.8013.02 ─ 06
About PDSCH and DMRS sequence generation
According to TS 38.211, the PDSCH sequence is generated based among others on
the value of the variable n
ID
, that can be:
●
n
ID
= N
ID
cell
(i.e. equal to the physical cell identifier) or
●
n
ID
= dataScramblingIdentityPDSCH (higher-layer parameter).
In this implementation, you set which of the two variants is used by the parameter Use
PDSCH Scrambling ID and the n
ID
value on both case by the parameters "Node > Car-
riers" > Cell ID and Data Scrambling ID.
According to TS 38.211, the DMRS sequence is generated based among others on the
values of the variables N
ID
0
,N
ID
1
and N
ID
n_SCID
or N
ID
0
and N
ID
n_SCID
with n_SCID = {0,
1}.
Which of these two combinations of variables is used depends on whether the PDSCH
is scheduled by PDCCH using DCI format 1_1 or DCI format 1_0.
In this implementation, you define the values as follows:
●
N
ID
0
, N
ID
1
per DMRS type are set with "User/BWP > DL BWP > PDSCH" > Scram-
bling ID 0/Scrambling ID 1.
●
If N
ID
0
or N
ID
1
is used is set with "Scheduling > PDSCH > DMRS" > N_SCID.
●
If N
ID
n_SCID
= N
ID
cell
or N
ID
n_SCID
= N
ID
0
or N
ID
1
is set with "Scheduling > PDSCH >
DMRS" > Sequence Generation.
●
The DCI Format 1_0 field "DMRS Sequence Initialization".
Settings:
Config Type................................................................................................................... 58
Additional Position Index...............................................................................................59
Max Length................................................................................................................... 59
Scrambling ID 0/Scrambling ID 1..................................................................................59
PTRS Config ................................................................................................................ 59
└ State................................................................................................................60
└ RE-offset.........................................................................................................60
└ EPRE Ratio.....................................................................................................61
└ I_MCS_1/I_MCS_2/I_MCS_3.........................................................................61
└ N_RB_1/N_RB_2............................................................................................61
Use PDSCH Scrambling ID...........................................................................................61
Data Scrambling ID.......................................................................................................62
Max. Number of Codewords per DCI............................................................................62
VRB-to-PRB Interleaver................................................................................................62
MCS Table.....................................................................................................................62
Resource Allocation...................................................................................................... 62
Config Type
Sets the configuration type (type 1 or type 2). It thus defines the mapping of the
demodulation reference signal (DMRS) to the physical resource elements in the fre-
quency domain, as defined in TS 38.211.
The configuration type is carried by the higher-layer parameter dmrs-Type.
Users/BWPs Settings