5.4.2 PUCCH formats 2, 2a and 2b
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
The block of bits 
shall be scrambled with a UE-specific scrambling sequence, resulting in a block of scrambled bits 
according to
where the scrambling sequence 
is given by clause 7.2. The scrambling sequence generator shall be initialised with 
at the start of each subframe where 
is C-RNTI.
The block of scrambled bits 
shall be QPSK modulated as described in clause 7.1, resulting in a block of complex-valued modulation symbols 
.
Each complex-valued symbol shall be multiplied with a cyclically shifted length 
sequence 
for each of the 
antenna ports used for PUCCH transmission according to
where 
is defined by clause 5.5.1 with
and 
.
Resources used for transmission of PUCCH formats 2/2a/2b are identified by a resource index 
from which the cyclic shift 
is determined according to
where
and
for 
and by
for 
.
For PUCCH formats 2a and 2b, supported for normal cyclic prefix only, the bit(s) 
shall be modulated as described in Table 5.4.2-1 resulting in a single modulation symbol 
used in the generation of the reference-signal for PUCCH format 2a and 2b as described in clause 5.5.2.2.1.
Table 5.4.2-1: Modulation symbol 
for PUCCH formats 2a and 2b
|
PUCCH format |
|
|
|
2a |
0 |
|
|
1 |
|
|
|
2b |
00 |
|
|
01 |
|
|
|
10 |
|
|
|
11 |
|
