5.4A Short Physical Uplink Control Channel
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
5.4A.1 General
The short physical uplink control channel, SPUCCH, carries uplink control information. Simultaneous transmission of SPUCCH and PUSCH from the same UE where both SPUCCH and PUSCH is using either slot or subslot transmission is supported if enabled by higher layers (see simultaneousPUCCH-PUSCH in TS 36.331 [9]). For frame structure type 2 and in UpPTS, transmission of SPUCCH is not supported.
SPUCCH supports multiple formats as shown in Table 5.4A-1 and Table 5.4A-2 with different number of bits carried by each SPUCCH.
Table 5.4A-1: SPUCCH formats for slot transmission
|
SPUCCH format |
Modulation scheme |
Number of bits per slot, |
|
1 |
N/A |
N/A |
|
1a |
BPSK |
1 |
|
1b |
QPSK |
2 |
|
3 |
QPSK |
24 |
|
4 |
QPSK |
|
Table 5.4A-2: SPUCCH formats for subslot transmission
|
SPUCCH format |
Modulation scheme |
Number of bits per subslot, |
|
1 |
N/A |
N/A |
|
1a |
N/A |
1 |
|
1b |
N/A |
2 |
|
4 |
QPSK |
|
The quantity 
represents the bandwidth of the SPUCCH format 4 as defined by clause 5.4A.4.1, and 
and 
are defined in Table 5.4A.4.1-1 and Table 5.4A.4.2-1, respectively.
SPUCCH formats 1/1a/1b use a cyclic shift, 
, which varies with the symbol number 
and the slot number 
as described in clause 5.4.
5.4A.2 SPUCCH formats 1,1a,1b
5.4A.2.1 Slot-SPUCCH
Slot-SPUCCH format 1, 1a, 1b can be configured by higher layers to either have frequency hopping enabled or disabled (see n1SlotSPUCCH-FH-AN-List and n1SlotSPUCCH-NoFH-AN-List in TS 36.331 [9]).
In case slot-SPUCCH format 1, 1a, 1b and frequency hopping is enabled, the scrambled and block-wise spread complex-valued symbols 
are generated as described in clause 5.4.1 for PUCCH format 1/1a/1b where 
, 
and
.
In case slot-SPUCCH format 1, 1a, 1b and frequency hopping is disabled, the scrambled and block-wise spread complex-valued symbols 
are generated as described in clause 5.4.1 for PUCCH format 1/1a/1b where 
.
Irrespective of frequency hopping being enabled or disabled, 
is applied as described in clause 5.4.1 for the slot in which the slot-SPUCCH is transmitted in, i.e. either in the first or the second slot of the subframe.
Resources used for transmission of slot-SPUCCH format 1, 1a and 1b are identified by a resource index 
from which the cyclic shift 
is derived:
,
In case frequency hopping is enabled, the cyclic shift is determined as described in clause 5.4.2, assuming the condition 
is fulfilled.
In case frequency hopping is disabled, the resource index 
also indicates the orthogonal sequence index 
. Both the cyclic shift and the orthogonal sequence index is in this case determined as described in clause 5.4.1.
5.4A.2.2 Subslot-SPUCCH
For subslot-SPUCCH formats 1a and 1b, one or two bits are communicated by SPUCCH resource selection. The resource set available for selection are configured by higher layers (see n1SubslotSPUCCH-AN-List and sr-SubslotSPUCCH-ResourceList in TS 36.331 [9]). For subslot-SPUCCH format 1, information is carried by the presence/absence of transmission of subslot-SPUCCH from the UE.
The sequence 
is generated as described in clause 5.4.1, assuming 
.
The block of complex-valued symbols 
shall be scrambled by 
as described in clause 5.4.1 assuming 
, 
, and with 
replaced by 
, defined in Table 5.4A.2.2-1.
Table 5.4A.2.2-1: The quantity 
for subslot-SPUCCH formats 1a and 1b
|
SPUCCH format type |
Subslot number in subframe |
|
|
Normal SPUCCH format |
1,2,3,4 |
2 |
|
Normal SPUCCH format |
0,5 |
3 |
|
Shortened SPUCCH format |
5 |
2 |
Resources used for transmission of SPUCCH format 1, 1a and 1b are identified by a resource index 
from which the cyclic shift 
is determined, as described in clause 5.4.2, assuming the condition 
is fulfilled.The resource set for subslot-SPUCCH format 1/1a/1b is configured by higher layers (see n1SubslotSPUCCH-AN-List in TS 36.331 [9]):
– subslot-SPUCCH format 1: 
– subslot-SPUCCH format 1a: 
– subslot-SPUCCH format 1b: 
Each resource indicates (a) bit state(s) as defined by Table 5.4A.2.2-2.
Table 5.4A.2.2-2: Subslot-SPUCCH resource for formats 1a and 1b
|
PUCCH format |
|
|
|
1 |
– |
|
|
1a |
0 |
|
|
1 |
|
|
|
1b |
00 |
|
|
10 |
|
|
|
01 |
|
|
|
11 |
|
5.4A.3 SPUCCH format 3
5.4A.3.1 Slot-SPUCCH
The complex-valued modulation symbols 
shall be generated as described in clause 5.4.2A.
Depending on if the slot-SPUCCH is transmitted in the first or the second slot of the subframe, different block-wise spreading with the orthogonal sequences 
or 
is applied. Each spreading results in 
sets of 
values each according to:
where
– 
(see clause 5.4.2A) if transmitted in the first slot, and 
(see clause 5.4.2A), if transmitted in the second slot.
– The orthogonal sequences 
and 
are given by Table 5.4.2A-1
Resources used for transmission of SPUCCH format 3 are identified by a resource index 
from which the quantities 
and 
are derived according to clause 5.4A.3 by replacing 
with 
.
Each set of complex-valued symbols shall be cyclically shifted and transform precoded according to clause 5.4.2A with 
replaced by 
in the transform precoding.
5.4A.4 SPUCCH format 4
5.4A.4.1 Slot-SPUCCH
The block of bits 
shall be scrambled according to clause 5.4.2B.
The block of scrambled bits 
shall be QPSK modulated as described in Clause 7.1, resulting in a block of complex-valued modulation symbols 
where 
.
The block of complex-valued symbols 
is divided into 
(defined in Table 5.4A.4.1-1) sets, each corresponding to one SC-FDMA symbol. Transform precoding shall be applied according to clause 5.4.2B replacing 
with 
and replacing 
with 
.
The variable
, where 
represents the bandwidth of the SPUCCH format 4 in terms of resource blocks in the frequency domain, and is determined by higher layer signalling (n4numberOfPRB-r15, see TS 36.213 [4, Table 10.1.1-2] and TS 36.331 [9]), and shall fulfil
,
where, 
is a set of non-negative integers.
Table 5.4A.4.1-1: The quantity 
.
|
SPUCCH format type |
|
|
Normal SPUCCH format |
5 |
|
Shortened SPUCCH format |
4 |
5.4A.4.2 Subslot-SPUCCH
For subslot-SPUCCH the procedure of slot-SPUCCH in clause 5.4A.4.1 is followed except that:
– the block of complex-valued symbols 
is divided into 
(defined in Table 5.4A.4.2-1) sets, instead of 
sets, and,
– 
is replaced by 
, in the transform precoding.
Table 5.4A.4.2-1: The quantity 
.
|
SPUCCH format type |
Subslot number in subframe |
|
|
Normal SPUCCH format |
1,2,3,4 |
1 |
|
Normal SPUCCH format |
0,5 |
2 |
|
Shortened SPUCCH format |
5 |
1 |
5.4A.5 Mapping to physical resources
The block of complex-valued symbols 
shall be multiplied with the amplitude scaling factor 
in order to conform to the transmit power 
specified in Clause 5.1.2.1 of TSÂ 36.213Â [4], and mapped in sequence starting with 
to resource elements.
SPUCCH uses one or more resource block in the frequency domain and is mapped to either a slot or a subslot in the time domain. Within the physical resource block(s) used for transmission, the mapping of 
to resource elements 
on antenna port 
and not used for transmission of reference signals shall be in increasing order of first 
, then 
.
The starting symbol 
for each subslot number is provided by Table 5.4A.4.5-1 for subslot-SPUCCH.
For slot-SPUCCH the starting symbol is 
for the slot the SPUCCH is transmitted in.
Table 5.4A.5-1: Starting symbol for subslot-SPUCCH mapping
|
Subslot number |
||||||
|
0 |
1 |
2 |
3 |
4 |
5 |
|
|
Format 1/1a/1b |
0 |
3 |
5 |
0 |
2 |
4 |
|
Format 4 |
1 |
4 |
6 |
1 |
3 |
5 |
The relation between the index 
and the antenna port number 
is given by Table 5.2.1-1.
The physical resource blocks (
) within which the transmission of SPUCCH is carried out in slot 
depends on the SPUCCH format and whether frequency hopping is enabled or not.
In case of slot-SPUCCH format 1, 1a, 1b and frequency hopping disabled, the PRB used is determined as described in clause 5.4.3 for PUCCH format 1, 1a, 1b.
In case of slot-SPUCCH format 3, the PRB used is given by
For the other SPUCCH formats, it is determined by Table 5.4A.5-2, Table 5.4A.5-3 and Table 5.4A.5-4.
Table 5.4A.5-2: 
for slot-SPUCCH format 1, 1a, 1b with frequency hopping enabled
|
Slot number |
Slot-SPUCCH format |
|
Format 1/1a/1b with frequency hopping enabled |
|
|
|
|
|
|
|
Table 5.4A.5-3: 
for slot-SPUCCH format 4
|
Slot number |
Slot-SPUCCH format |
|
Format 4 |
|
|
|
|
|
|
|
Table 5.4A.5-4: 
for subslot-SPUCCH format 1, 1a, 1b, 4
|
Subslot number |
SPUCCH format |
|
|
Format 1/1a/1b |
Format 4 |
|
|
0 |
|
|
|
1 |
|
|
|
2 |
|
|
|
3 |
|
|
|
4 |
|
|
|
5 |
|
|
The variable 
depends on the SPUCCH format as defined in Table 5.4A.5-5.
Table 5.4A.5-5: 
for SPUCCH
|
SPUCCH Format |
|
|
|
Slot |
Format 1, 1a, 1b |
Frequency hopping disabled: see derivation of Frequency hopping enabled: see derivation of |
|
Format 3 |
|
|
|
Format 4 |
|
|
|
Subslot |
Format 1, 1a, 1b |
see derivation of |
|
Format 4 |
|
|
for PUCCH format 1, 1a, 1b in clause 5.4.3 replacing 
with 
for PUCCH format 2, 2a, 2b in clause 5.4.3 replacing 
with 
for PUCCH format 2, 2a, 2b in clause 5.4.3 replacing 
with 
In case of subslot-SPUCCH, there is a configuration restriction that each SPUCCH resource in the resource set, of up to four resources, 
, shall map to the same pair of PRBs (
) This restriction applies separately to each of n1SubslotSPUCCH-AN-List and sr-SubslotSPUCCH-Resource in TS 36.331 [9].
In case of simultaneous transmission of sounding reference signal and SPUCCH when there is one serving cell configured, the shortened SPUCCH format shall be used where the last SC-FDMA symbol in the second slot of a subframe shall be left empty.