5.4.1 PUCCH formats 1, 1a and 1b

36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS

For PUCCH format 1, information is carried by the presence/absence of transmission of PUCCH from the UE.
In the remainder of this clause, shall be assumed for PUCCH format 1.

For PUCCH formats 1a and 1b, one or two explicit bits are transmitted, respectively. The block of bits shall be modulated as described in Table 5.4.1-1, resulting in a complex-valued symbol.
The modulation schemes for the different PUCCH formats are given by Table 5.4-1.

The 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 . The antenna-port specific cyclic shift varies between symbols and slots as defined below.

The block of complex-valued symbols shall be scrambled by and block-wise spread with the antenna-port specific orthogonal sequence according to

where

and

with for the two slots in a subframe given by Table 5.4.1-1a. The sequence is given by Table 5.4.1-2 and Table 5.4.1-3 and is defined below.

Resources used for transmission of PUCCH format 1, 1a and 1b are identified by a resource index from which the orthogonal sequence index and the cyclic shift are determined according to

where

The resource indices within the two resource blocks in the two slots of a subframe to which the PUCCH is mapped are given by

for and by

for , where , with for normal CP and for extended CP.

The parameter deltaPUCCH-Shift is provided by higher layers.

Table 5.4.1-1: Modulation symbol for PUCCH formats 1a and 1b

PUCCH format
1a	0
	1
1b	00
	01
	10
	11

Table 5.4.1-1a: The quantity for PUCCH formats 1a and 1b

PUCCH format
	first slot	second slot
normal 1/1a/1b	4	4
shortened 1/1a/1b	4	3

Table 5.4.1-2: Orthogonal sequences for

Sequence index	Orthogonal sequences
0
1
2

Table 5.4.1-3: Orthogonal sequences for

Sequence index	Orthogonal sequences
0
1
2