5.5.1 Generation of the reference signal sequence
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
Reference signal sequence 
is defined by a cyclic shift 
of a base sequence 
according to
where
– 
is the length of the reference signal sequence, 
, 
is defined in clause 5.5.2.1.2, and,
– 
when either
– the higher-layer parameter ul-DMRS-IFDMA is set and the most recent uplink-related DCI contains the Cyclic Shift Field mapping table for DMRS bit field which is set to 1 to indicate the use of Table 5.5.2.1.1-3, or,
– the Cyclic Shift Field mapping table for DMRS bit is set to 1 in the most recent uplink-related DCI format 7 which indicates the use of Table 5.5.2.1.1-4, and
– 
otherwise.
Multiple reference signal sequences are defined from a single base sequence through different values of 
.
Base sequences 
are divided into groups, where 
is the group number and 
is the base sequence number within the group, such that each group contains one base sequence (
) of each length 
, 
and two base sequences (
) of each length 
, 
. The sequence group number 
and the number 
within the group may vary in time as described in clauses 5.5.1.3 and 5.5.1.4, respectively. The definition of the base sequence 
depends on the sequence length
.
5.5.1.1 Base sequences of length 
or larger
For
, the base sequence 
is given by
where the 
root Zadoff-Chu sequence is defined by
with 
given by
The length 
of the Zadoff-Chu sequence is given by the largest prime number such that
.
5.5.1.2 Base sequences of length less than 
For 
, 
, 
, and 
, the base sequence is given by
where the value of 
is given by Table 5.5.1.2-1, Table 5.5.1.2-2, Table 5.5.1.2-3, and Table 5.5.1.2-4 for 
, 
, 
, and 
, respectively. For 
, the base sequence 
is given by
Table 5.5.1.2-1: Definition of 
for 
.
|
|
|
|||||||||||
|
0 |
-1 |
1 |
3 |
-3 |
3 |
3 |
1 |
1 |
3 |
1 |
-3 |
3 |
|
1 |
1 |
1 |
3 |
3 |
3 |
-1 |
1 |
-3 |
-3 |
1 |
-3 |
3 |
|
2 |
1 |
1 |
-3 |
-3 |
-3 |
-1 |
-3 |
-3 |
1 |
-3 |
1 |
-1 |
|
3 |
-1 |
1 |
1 |
1 |
1 |
-1 |
-3 |
-3 |
1 |
-3 |
3 |
-1 |
|
4 |
-1 |
3 |
1 |
-1 |
1 |
-1 |
-3 |
-1 |
1 |
-1 |
1 |
3 |
|
5 |
1 |
-3 |
3 |
-1 |
-1 |
1 |
1 |
-1 |
-1 |
3 |
-3 |
1 |
|
6 |
-1 |
3 |
-3 |
-3 |
-3 |
3 |
1 |
-1 |
3 |
3 |
-3 |
1 |
|
7 |
-3 |
-1 |
-1 |
-1 |
1 |
-3 |
3 |
-1 |
1 |
-3 |
3 |
1 |
|
8 |
1 |
-3 |
3 |
1 |
-1 |
-1 |
-1 |
1 |
1 |
3 |
-1 |
1 |
|
9 |
1 |
-3 |
-1 |
3 |
3 |
-1 |
-3 |
1 |
1 |
1 |
1 |
1 |
|
10 |
-1 |
3 |
-1 |
1 |
1 |
-3 |
-3 |
-1 |
-3 |
-3 |
3 |
-1 |
|
11 |
3 |
1 |
-1 |
-1 |
3 |
3 |
-3 |
1 |
3 |
1 |
3 |
3 |
|
12 |
1 |
-3 |
1 |
1 |
-3 |
1 |
1 |
1 |
-3 |
-3 |
-3 |
1 |
|
13 |
3 |
3 |
-3 |
3 |
-3 |
1 |
1 |
3 |
-1 |
-3 |
3 |
3 |
|
14 |
-3 |
1 |
-1 |
-3 |
-1 |
3 |
1 |
3 |
3 |
3 |
-1 |
1 |
|
15 |
3 |
-1 |
1 |
-3 |
-1 |
-1 |
1 |
1 |
3 |
1 |
-1 |
-3 |
|
16 |
1 |
3 |
1 |
-1 |
1 |
3 |
3 |
3 |
-1 |
-1 |
3 |
-1 |
|
17 |
-3 |
1 |
1 |
3 |
-3 |
3 |
-3 |
-3 |
3 |
1 |
3 |
-1 |
|
18 |
-3 |
3 |
1 |
1 |
-3 |
1 |
-3 |
-3 |
-1 |
-1 |
1 |
-3 |
|
19 |
-1 |
3 |
1 |
3 |
1 |
-1 |
-1 |
3 |
-3 |
-1 |
-3 |
-1 |
|
20 |
-1 |
-3 |
1 |
1 |
1 |
1 |
3 |
1 |
-1 |
1 |
-3 |
-1 |
|
21 |
-1 |
3 |
-1 |
1 |
-3 |
-3 |
-3 |
-3 |
-3 |
1 |
-1 |
-3 |
|
22 |
1 |
1 |
-3 |
-3 |
-3 |
-3 |
-1 |
3 |
-3 |
1 |
-3 |
3 |
|
23 |
1 |
1 |
-1 |
-3 |
-1 |
-3 |
1 |
-1 |
1 |
3 |
-1 |
1 |
|
24 |
1 |
1 |
3 |
1 |
3 |
3 |
-1 |
1 |
-1 |
-3 |
-3 |
1 |
|
25 |
1 |
-3 |
3 |
3 |
1 |
3 |
3 |
1 |
-3 |
-1 |
-1 |
3 |
|
26 |
1 |
3 |
-3 |
-3 |
3 |
-3 |
1 |
-1 |
-1 |
3 |
-1 |
-3 |
|
27 |
-3 |
-1 |
-3 |
-1 |
-3 |
3 |
1 |
-1 |
1 |
3 |
-3 |
-3 |
|
28 |
-1 |
3 |
-3 |
3 |
-1 |
3 |
3 |
-3 |
3 |
3 |
-1 |
-1 |
|
29 |
3 |
-3 |
-3 |
-1 |
-1 |
-3 |
-1 |
3 |
-3 |
3 |
1 |
-1 |
Table 5.5.1.2-2: Definition of 
for 
|
|
|
|||||||||||||||||||||||
|
0 |
-1 |
3 |
1 |
-3 |
3 |
-1 |
1 |
3 |
-3 |
3 |
1 |
3 |
-3 |
3 |
1 |
1 |
-1 |
1 |
3 |
-3 |
3 |
-3 |
-1 |
-3 |
|
1 |
-3 |
3 |
-3 |
-3 |
-3 |
1 |
-3 |
-3 |
3 |
-1 |
1 |
1 |
1 |
3 |
1 |
-1 |
3 |
-3 |
-3 |
1 |
3 |
1 |
1 |
-3 |
|
2 |
3 |
-1 |
3 |
3 |
1 |
1 |
-3 |
3 |
3 |
3 |
3 |
1 |
-1 |
3 |
-1 |
1 |
1 |
-1 |
-3 |
-1 |
-1 |
1 |
3 |
3 |
|
3 |
-1 |
-3 |
1 |
1 |
3 |
-3 |
1 |
1 |
-3 |
-1 |
-1 |
1 |
3 |
1 |
3 |
1 |
-1 |
3 |
1 |
1 |
-3 |
-1 |
-3 |
-1 |
|
4 |
-1 |
-1 |
-1 |
-3 |
-3 |
-1 |
1 |
1 |
3 |
3 |
-1 |
3 |
-1 |
1 |
-1 |
-3 |
1 |
-1 |
-3 |
-3 |
1 |
-3 |
-1 |
-1 |
|
5 |
-3 |
1 |
1 |
3 |
-1 |
1 |
3 |
1 |
-3 |
1 |
-3 |
1 |
1 |
-1 |
-1 |
3 |
-1 |
-3 |
3 |
-3 |
-3 |
-3 |
1 |
1 |
|
6 |
1 |
1 |
-1 |
-1 |
3 |
-3 |
-3 |
3 |
-3 |
1 |
-1 |
-1 |
1 |
-1 |
1 |
1 |
-1 |
-3 |
-1 |
1 |
-1 |
3 |
-1 |
-3 |
|
7 |
-3 |
3 |
3 |
-1 |
-1 |
-3 |
-1 |
3 |
1 |
3 |
1 |
3 |
1 |
1 |
-1 |
3 |
1 |
-1 |
1 |
3 |
-3 |
-1 |
-1 |
1 |
|
8 |
-3 |
1 |
3 |
-3 |
1 |
-1 |
-3 |
3 |
-3 |
3 |
-1 |
-1 |
-1 |
-1 |
1 |
-3 |
-3 |
-3 |
1 |
-3 |
-3 |
-3 |
1 |
-3 |
|
9 |
1 |
1 |
-3 |
3 |
3 |
-1 |
-3 |
-1 |
3 |
-3 |
3 |
3 |
3 |
-1 |
1 |
1 |
-3 |
1 |
-1 |
1 |
1 |
-3 |
1 |
1 |
|
10 |
-1 |
1 |
-3 |
-3 |
3 |
-1 |
3 |
-1 |
-1 |
-3 |
-3 |
-3 |
-1 |
-3 |
-3 |
1 |
-1 |
1 |
3 |
3 |
-1 |
1 |
-1 |
3 |
|
11 |
1 |
3 |
3 |
-3 |
-3 |
1 |
3 |
1 |
-1 |
-3 |
-3 |
-3 |
3 |
3 |
-3 |
3 |
3 |
-1 |
-3 |
3 |
-1 |
1 |
-3 |
1 |
|
12 |
1 |
3 |
3 |
1 |
1 |
1 |
-1 |
-1 |
1 |
-3 |
3 |
-1 |
1 |
1 |
-3 |
3 |
3 |
-1 |
-3 |
3 |
-3 |
-1 |
-3 |
-1 |
|
13 |
3 |
-1 |
-1 |
-1 |
-1 |
-3 |
-1 |
3 |
3 |
1 |
-1 |
1 |
3 |
3 |
3 |
-1 |
1 |
1 |
-3 |
1 |
3 |
-1 |
-3 |
3 |
|
14 |
-3 |
-3 |
3 |
1 |
3 |
1 |
-3 |
3 |
1 |
3 |
1 |
1 |
3 |
3 |
-1 |
-1 |
-3 |
1 |
-3 |
-1 |
3 |
1 |
1 |
3 |
|
15 |
-1 |
-1 |
1 |
-3 |
1 |
3 |
-3 |
1 |
-1 |
-3 |
-1 |
3 |
1 |
3 |
1 |
-1 |
-3 |
-3 |
-1 |
-1 |
-3 |
-3 |
-3 |
-1 |
|
16 |
-1 |
-3 |
3 |
-1 |
-1 |
-1 |
-1 |
1 |
1 |
-3 |
3 |
1 |
3 |
3 |
1 |
-1 |
1 |
-3 |
1 |
-3 |
1 |
1 |
-3 |
-1 |
|
17 |
1 |
3 |
-1 |
3 |
3 |
-1 |
-3 |
1 |
-1 |
-3 |
3 |
3 |
3 |
-1 |
1 |
1 |
3 |
-1 |
-3 |
-1 |
3 |
-1 |
-1 |
-1 |
|
18 |
1 |
1 |
1 |
1 |
1 |
-1 |
3 |
-1 |
-3 |
1 |
1 |
3 |
-3 |
1 |
-3 |
-1 |
1 |
1 |
-3 |
-3 |
3 |
1 |
1 |
-3 |
|
19 |
1 |
3 |
3 |
1 |
-1 |
-3 |
3 |
-1 |
3 |
3 |
3 |
-3 |
1 |
-1 |
1 |
-1 |
-3 |
-1 |
1 |
3 |
-1 |
3 |
-3 |
-3 |
|
20 |
-1 |
-3 |
3 |
-3 |
-3 |
-3 |
-1 |
-1 |
-3 |
-1 |
-3 |
3 |
1 |
3 |
-3 |
-1 |
3 |
-1 |
1 |
-1 |
3 |
-3 |
1 |
-1 |
|
21 |
-3 |
-3 |
1 |
1 |
-1 |
1 |
-1 |
1 |
-1 |
3 |
1 |
-3 |
-1 |
1 |
-1 |
1 |
-1 |
-1 |
3 |
3 |
-3 |
-1 |
1 |
-3 |
|
22 |
-3 |
-1 |
-3 |
3 |
1 |
-1 |
-3 |
-1 |
-3 |
-3 |
3 |
-3 |
3 |
-3 |
-1 |
1 |
3 |
1 |
-3 |
1 |
3 |
3 |
-1 |
-3 |
|
23 |
-1 |
-1 |
-1 |
-1 |
3 |
3 |
3 |
1 |
3 |
3 |
-3 |
1 |
3 |
-1 |
3 |
-1 |
3 |
3 |
-3 |
3 |
1 |
-1 |
3 |
3 |
|
24 |
1 |
-1 |
3 |
3 |
-1 |
-3 |
3 |
-3 |
-1 |
-1 |
3 |
-1 |
3 |
-1 |
-1 |
1 |
1 |
1 |
1 |
-1 |
-1 |
-3 |
-1 |
3 |
|
25 |
1 |
-1 |
1 |
-1 |
3 |
-1 |
3 |
1 |
1 |
-1 |
-1 |
-3 |
1 |
1 |
-3 |
1 |
3 |
-3 |
1 |
1 |
-3 |
-3 |
-1 |
-1 |
|
26 |
-3 |
-1 |
1 |
3 |
1 |
1 |
-3 |
-1 |
-1 |
-3 |
3 |
-3 |
3 |
1 |
-3 |
3 |
-3 |
1 |
-1 |
1 |
-3 |
1 |
1 |
1 |
|
27 |
-1 |
-3 |
3 |
3 |
1 |
1 |
3 |
-1 |
-3 |
-1 |
-1 |
-1 |
3 |
1 |
-3 |
-3 |
-1 |
3 |
-3 |
-1 |
-3 |
-1 |
-3 |
-1 |
|
28 |
-1 |
-3 |
-1 |
-1 |
1 |
-3 |
-1 |
-1 |
1 |
-1 |
-3 |
1 |
1 |
-3 |
1 |
-3 |
-3 |
3 |
1 |
1 |
-1 |
3 |
-1 |
-1 |
|
29 |
1 |
1 |
-1 |
-1 |
-3 |
-1 |
3 |
-1 |
3 |
-1 |
1 |
3 |
1 |
-1 |
3 |
1 |
3 |
-3 |
-3 |
1 |
-1 |
-1 |
1 |
3 |
Table 5.5.1.2-3: Definition of 
for 
|
|
|
|||||
|
0 |
-1 |
-3 |
3 |
-3 |
3 |
-3 |
|
1 |
-1 |
3 |
-1 |
1 |
1 |
1 |
|
2 |
3 |
-1 |
-3 |
-3 |
1 |
3 |
|
3 |
3 |
-1 |
-1 |
1 |
-1 |
-1 |
|
4 |
-1 |
-1 |
-3 |
1 |
-3 |
-1 |
|
5 |
1 |
3 |
-3 |
-1 |
-3 |
3 |
|
6 |
-3 |
3 |
-1 |
-1 |
1 |
-3 |
|
7 |
-1 |
-3 |
-3 |
1 |
3 |
3 |
|
8 |
3 |
-1 |
-1 |
3 |
1 |
3 |
|
9 |
3 |
-3 |
3 |
1 |
-1 |
1 |
|
10 |
-3 |
1 |
-3 |
-3 |
-3 |
-3 |
|
11 |
-3 |
-3 |
-3 |
1 |
-3 |
-3 |
|
12 |
3 |
-3 |
1 |
-1 |
-3 |
-3 |
|
13 |
3 |
-3 |
3 |
-1 |
-1 |
-3 |
|
14 |
3 |
-1 |
1 |
3 |
3 |
1 |
|
15 |
-1 |
1 |
-1 |
-3 |
1 |
1 |
|
16 |
-3 |
-1 |
-3 |
-1 |
3 |
3 |
|
17 |
1 |
-1 |
3 |
-3 |
3 |
3 |
|
18 |
1 |
3 |
1 |
1 |
-3 |
3 |
|
19 |
-1 |
-3 |
-1 |
-1 |
3 |
-3 |
|
20 |
3 |
-1 |
-3 |
-1 |
-1 |
-3 |
|
21 |
3 |
1 |
3 |
-3 |
-3 |
1 |
|
22 |
1 |
3 |
-1 |
-1 |
1 |
-1 |
|
23 |
-3 |
1 |
-3 |
3 |
3 |
3 |
|
24 |
1 |
3 |
-3 |
3 |
-3 |
3 |
|
25 |
-1 |
-1 |
1 |
-3 |
1 |
-1 |
|
26 |
1 |
-3 |
-1 |
-1 |
3 |
1 |
|
27 |
-3 |
-1 |
-1 |
3 |
1 |
1 |
|
28 |
-1 |
3 |
-3 |
-3 |
-3 |
3 |
|
29 |
3 |
1 |
-1 |
1 |
3 |
1 |
Table 5.5.1.2-4: Definition of 
for 
|
|
|
|||||||||||||||||
|
0 |
-3 |
-3 |
-3 |
-3 |
-3 |
-1 |
1 |
-1 |
-3 |
3 |
-1 |
3 |
-1 |
3 |
-3 |
-1 |
-1 |
3 |
|
1 |
-3 |
-3 |
-3 |
-3 |
-3 |
-1 |
1 |
-1 |
1 |
-3 |
-3 |
-3 |
1 |
-1 |
3 |
-3 |
-3 |
1 |
|
2 |
-3 |
-3 |
-3 |
-3 |
-3 |
-1 |
1 |
1 |
3 |
-3 |
1 |
1 |
-3 |
1 |
-3 |
3 |
1 |
-1 |
|
3 |
-3 |
-3 |
-3 |
-3 |
-3 |
-1 |
1 |
3 |
-3 |
-1 |
3 |
-1 |
3 |
1 |
-1 |
-3 |
3 |
-3 |
|
4 |
-3 |
-3 |
-3 |
-3 |
-3 |
-1 |
3 |
-3 |
-1 |
1 |
-1 |
-3 |
3 |
3 |
1 |
-3 |
1 |
-1 |
|
5 |
-3 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
-3 |
-3 |
-3 |
1 |
1 |
1 |
-3 |
1 |
1 |
-3 |
-3 |
|
6 |
-3 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
-3 |
1 |
1 |
-3 |
-3 |
-3 |
1 |
-1 |
3 |
-1 |
3 |
|
7 |
-3 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
-1 |
3 |
-1 |
3 |
3 |
-1 |
-1 |
1 |
3 |
3 |
-1 |
|
8 |
-3 |
-3 |
-3 |
-3 |
-3 |
1 |
-1 |
-1 |
-1 |
-3 |
3 |
-1 |
3 |
-3 |
3 |
-1 |
1 |
3 |
|
9 |
-3 |
-3 |
-3 |
-3 |
-3 |
3 |
-3 |
1 |
-1 |
3 |
-3 |
3 |
3 |
-1 |
-3 |
1 |
1 |
-3 |
|
10 |
-3 |
-3 |
-3 |
-3 |
-3 |
3 |
-1 |
-3 |
-3 |
1 |
1 |
3 |
-3 |
-1 |
3 |
-1 |
3 |
1 |
|
11 |
-3 |
-3 |
-3 |
-3 |
-3 |
3 |
3 |
-1 |
-1 |
-1 |
3 |
1 |
-3 |
3 |
-1 |
1 |
-3 |
1 |
|
12 |
-3 |
-3 |
-3 |
-3 |
-1 |
-3 |
-3 |
-3 |
1 |
3 |
1 |
-1 |
3 |
-3 |
-1 |
-3 |
1 |
1 |
|
13 |
-3 |
-3 |
-3 |
-3 |
-1 |
-3 |
-3 |
1 |
-1 |
-1 |
3 |
-3 |
-3 |
1 |
3 |
1 |
-3 |
1 |
|
14 |
-3 |
-3 |
-3 |
-3 |
-1 |
-3 |
-3 |
1 |
3 |
-3 |
-1 |
3 |
1 |
3 |
-1 |
3 |
-1 |
-3 |
|
15 |
-3 |
-3 |
-3 |
-3 |
-1 |
-3 |
-1 |
3 |
-3 |
1 |
-3 |
1 |
-1 |
-3 |
-3 |
1 |
1 |
3 |
|
16 |
-3 |
-3 |
-3 |
-3 |
-1 |
-1 |
3 |
-3 |
3 |
-1 |
-3 |
1 |
1 |
-1 |
-3 |
-1 |
3 |
-3 |
|
17 |
-3 |
-3 |
-3 |
-3 |
-1 |
-1 |
3 |
-1 |
-3 |
1 |
3 |
-1 |
-3 |
-3 |
1 |
3 |
-1 |
1 |
|
18 |
-3 |
-3 |
-3 |
-3 |
-1 |
3 |
-1 |
-1 |
3 |
3 |
-1 |
-3 |
1 |
1 |
1 |
-1 |
-3 |
-1 |
|
19 |
-3 |
-3 |
-3 |
-3 |
-1 |
3 |
1 |
-3 |
-1 |
-3 |
3 |
1 |
-1 |
3 |
-1 |
1 |
3 |
-1 |
|
20 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
-3 |
3 |
1 |
1 |
-3 |
-1 |
1 |
3 |
3 |
-1 |
3 |
-1 |
|
21 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
1 |
3 |
1 |
-1 |
-1 |
3 |
3 |
-1 |
1 |
1 |
-3 |
3 |
|
22 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
3 |
-3 |
-1 |
3 |
1 |
1 |
-1 |
-1 |
3 |
3 |
-1 |
3 |
|
23 |
-3 |
-3 |
-3 |
-3 |
1 |
-3 |
3 |
-1 |
3 |
-3 |
-1 |
-1 |
-1 |
1 |
-3 |
-3 |
3 |
1 |
|
24 |
-3 |
-3 |
-3 |
-3 |
1 |
1 |
3 |
1 |
1 |
-1 |
3 |
1 |
1 |
3 |
-1 |
-3 |
1 |
3 |
|
25 |
-3 |
-3 |
-3 |
-3 |
1 |
3 |
3 |
3 |
1 |
-3 |
1 |
-3 |
-3 |
3 |
-3 |
1 |
-1 |
-3 |
|
26 |
-3 |
-3 |
-3 |
-3 |
3 |
1 |
3 |
3 |
-1 |
3 |
-3 |
-3 |
-1 |
3 |
-1 |
-1 |
-3 |
1 |
|
27 |
-3 |
-3 |
-3 |
-1 |
-3 |
-3 |
-1 |
-1 |
-3 |
3 |
3 |
1 |
-3 |
-1 |
-1 |
3 |
1 |
-3 |
|
28 |
-3 |
-3 |
-3 |
-1 |
-3 |
1 |
-1 |
1 |
-3 |
3 |
1 |
-3 |
-1 |
1 |
3 |
1 |
-1 |
-1 |
|
29 |
-3 |
-3 |
-3 |
-1 |
-3 |
3 |
1 |
1 |
-1 |
-1 |
1 |
3 |
1 |
-3 |
1 |
-3 |
-1 |
1 |
5.5.1.3 Group hopping
The sequence-group number 
in slot 
is defined by a group hopping pattern 
and a sequence-shift pattern 
according to
There are 17 different hopping patterns and 30 different sequence-shift patterns. Sequence-group hopping can be enabled or disabled by means of the cell-specific parameter Group-hopping-enabled provided by higher layers. Sequence-group hopping for PUSCH can be disabled for a certain UE through the higher-layer parameter Disable-sequence-group-hopping despite being enabled on a cell basis unless the PUSCH transmission corresponds to a Random Access Response Grant or a retransmission of the same transport block as part of the contention based random access procedure.
The group-hopping pattern 
may be different for PUSCH, (S)PUCCH and SRS and is given by
where the pseudo-random sequence 
is defined by clause 7.2. The pseudo-random sequence generator shall be initialized with 
at the beginning of each radio frame where 
is given by clause 5.5.1.5.
The sequence-shift pattern 
definition differs between PUCCH, PUSCH and SRS.
For SPUCCH/PUCCH, the sequence-shift pattern 
is given by 
where 
is given by clause 5.5.1.5.
For PUSCH, the sequence-shift pattern 
is given by 
, where 
is configured by higher layers, if no value for 
is provided by higher layers or if the PUSCH transmission corresponds to a Random Access Response Grant or a retransmission of the same transport block as part of the contention based random access procedure, otherwise it is given by 
with 
given by clause 5.5.1.5.
For SRS, the sequence-shift pattern 
is given by
where 
is given by clause 5.5.1.5.
5.5.1.4 Sequence hopping
Sequence hopping only applies for reference-signals of length 
.
For reference-signals of length 
, the base sequence number 
within the base sequence group is given by 
.
For reference-signals of length 
, the base sequence number 
within the base sequence group in slot 
is defined by
where the pseudo-random sequence 
is given by clause 7.2. The parameter Sequence-hopping-enabled provided by higher layers determines if sequence hopping is enabled or not. Sequence hopping for PUSCH can be disabled for a certain UE through the higher-layer parameter Disable-sequence-group-hopping despite being enabled on a cell basis unless the PUSCH transmission corresponds to a Random Access Response Grant or a retransmission of the same transport block as part of the contention based random access procedure.
For PUSCH or SPUCCH/PUCCH format 4 transmission with ≥ 6 RBs, the pseudo-random sequence generator shall be initialized with 
at the beginning of each radio frame where 
is given by clause 5.5.1.5.
For SRS, the pseudo-random sequence generator shall be initialized with 
at the beginning of each radio frame where 
is given by clause 5.5.1.5 and 
is given by clause 5.5.1.3.
5.5.1.5 Determining virtual cell identity for sequence generation
The definition of 
depends on the type of transmission.
Transmissions associated with PUSCH:
– 
if no value for 
is configured by higher layers or if the PUSCH transmission corresponds to a Random Access Response Grant or a retransmission of the same transport block as part of the contention based random access procedure,
– 
otherwise.
Transmissions associated with SPUCCH/PUCCH:
– 
if no value for 
is configured by higher layers,
– 
otherwise.
Basic sounding reference signals:
– if the higher-layer parameters nSRS-Identity-Legacy and nSRS-Identity both are configured, where equals the higher-layer parameter nSRS-Identity
– otherwise.
Additional sounding reference signals:
– if no value for is configured by the higher-layer parameter nSRS-Identity
– otherwise.