5.4 Physical uplink control channel
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
The physical uplink control channel, PUCCH, carries uplink control information. Simultaneous transmission of PUCCH and PUSCH from the same UE is supported if enabled by higher layers. For frame structure type 2, the PUCCH is not transmitted in the UpPTS field.
The physical uplink control channel supports multiple formats as shown in Table 5.4-1 with different number of bits per subframe, where 
represents the bandwidth of the PUCCH format 4 as defined by clause 5.4.2B, and 
and 
are defined in Table 5.4.2C-1.
Formats 2a and 2b are supported for normal cyclic prefix only.
Table 5.4-1: Supported PUCCH formats
|
PUCCH format |
Modulation scheme |
Number of bits per subframe, |
|
1 |
N/A |
N/A |
|
1a |
BPSK |
1 |
|
1b |
QPSK |
2 |
|
2 |
QPSK |
20 |
|
2a |
QPSK+BPSK |
21 |
|
2b |
QPSK+QPSK |
22 |
|
3 |
QPSK |
48 |
|
4 |
QPSK |
|
|
5 |
QPSK |
|
All PUCCH formats use a cyclic shift, 
, which varies with the symbol number 
and the slot number 
according to
where the pseudo-random sequence 
is defined by clause 7.2. The pseudo-random sequence generator shall be initialized with 
, where 
is given by clause 5.5.1.5 with 
corresponding to the primary cell, at the beginning of each radio frame.
The physical resources used for PUCCH format 1/1a/1b and PUCCH format 2/2a/2b depends on two parameters, 
and 
, given by higher layers.
The variable 
denotes the bandwidth in terms of resource blocks that are available for use by PUCCH formats 2/2a/2b transmission in each slot. The variable 
denotes the number of cyclic shift used for PUCCH formats 1/1a/1b in a resource block used for a mix of formats 1/1a/1b and 2/2a/2b. The value of 
is an integer multiple of 
within the range of {0, 1, …, 7}, where 
is provided by higher layers. No mixed resource block is present if 
. At most one resource block in each slot supports a mix of formats 1/1a/1b and 2/2a/2b.
Resources used for transmission of PUCCH formats 1/1a/1b, 2/2a/2b, 3, 4, and 5 are represented by the non-negative indices 
, 
, 
, 
and 
, respectively.