Method and apparatus for transmitting a reference signal
Disclosed is method and apparatus which includes: obtaining a sequence group number and/or a sequence number of a reference signal according to at least one of following pieces of information: the number N of time domain symbols included in a time unit in which the reference signal is located, a positive integer M, index information of time domain symbols in which the reference signal is located among N time domain symbols included in one time unit, index information of the time domain symbol in which the reference signal is located among M preset time domain symbols, a frame number of a frame in which the reference signal is located, the number B of time units included in the frame in which the reference signal is located, or a time unit index obtained according to a subcarrier spacing of a bandwidth part (BWP) in which the reference signal is located.
1. A method for transmitting a reference signal, comprising:
obtaining a sequence group number of the reference signal according to the following pieces of information:
a number N of time domain symbols comprised in a time unit in which the reference signal is located; index information of time domain symbols in which the reference signal is located among the N time domain symbols comprised in the time unit; and
a time unit index obtained according to a subcarrier spacing of a bandwidth part (BWP) in which the reference signal is located;
determining the reference signal according to the sequence group number; and
transmitting the reference signal;
wherein
obtaining the sequence group number of the reference signal comprises: obtaining the sequence group number of the reference signal through the following manner:
the sequence group number u=(f gh (x)+f ss )mod C;
f gh (x) is a function with respect to x, x comprises at least one of the pieces of information, C is a total number of sequence groups, f ss is obtained according to a parameter comprised in received signaling information, and
f
gh
(
x
)
=
(
∑
i
=
0
D
-
1
c
(
D
*
h
(
x
)
+
i
)
*
2
i
)
mod
C
,
wherein
h(x) is a function with respect to x, and h(x) satisfies h(l 2 , N, n s )=l 2 +n s *N,
l 2 is the index information of the time domain symbols in which the reference signal is located among the N time domain symbols comprised in the time unit, 0≤l 2 <N,
n s is the time unit index obtained according to the subcarrier spacing of the BWP in which the reference signal is located,
D is an integer equaling to 8, and
c(z) is a z-th value in a sequence generated by a random sequence function c(⋅), and z is a non-negative integer.
2. The method of claim 1 , wherein the method satisfies:
D
≥
⌈
log
2
(
C
)
⌉
+
⌈
log
2
(
C
x
1
)
⌉
-
1
;
wherein x 1 =2 ┌log 2 (C)┘ −C.
3. The method of claim 1 , wherein N is determined according to one of the following:
N is carried in a signaling information;
N is pre-agreed;
N is the number of time domain symbols comprised in a slot in which the reference signal is located; or
N is the number of time domain symbols comprised in a subframe in which the reference signal is located.
4. An apparatus for transmitting a reference signal, comprising:
an obtaining module, which is configured to obtain a sequence group number of a reference signal according to the following pieces of information:
a number N of time domain symbols comprised in a time unit in which the reference signal is located; index information of time domain symbols in which the reference signal is located among N time domain symbols comprised in one time unit; and
a time unit index obtained according to a subcarrier spacing of a bandwidth part (BWP) in which the reference signal is located;
a determination module, which is configured to determine the reference signal according to the sequence group number; and
a transmission module, which is configured to transmit the reference signal;
wherein
the obtaining module is configured to obtain the sequence group number of the reference signal through the following manner:
the sequence group number u=(f gh (x)+f ss )mod C;
f gh (x) is a function with respect to x, x comprises at least one of the pieces of information, C is a total number of sequence groups, f ss is obtained according to a parameter comprised in received signaling information, and
f
gh
(
x
)
=
(
∑
i
=
0
D
-
1
c
(
D
*
h
(
x
)
+
i
)
*
2
i
)
mod
C
,
wherein
h(x) is a function with respect to x, and h(x) satisfies h(l 2 , N, n s )=l 2 +n s *N,
l 2 is the index information of the time domain symbols in which the reference signal is located among the N time domain symbols comprised in the time unit, 0≤l 2 <N,
n s is the time unit index obtained according to the subcarrier spacing of the BWP in which the reference signal is located,
D is an integer equaling to 8, and
c(z) is a z-th value in a sequence generated by a random sequence function c(⋅), and z is a non-negative integer.
5. The apparatus of claim 4 , wherein the following is satisfied:
D
≥
⌈
log
2
(
C
)
⌉
+
⌈
log
2
(
C
x
1
)
⌉
-
1
;
wherein x 1 =2 ┌log 2 (C)┘ −C.
6. The apparatus of claim 4 , wherein N is determined according to one of the following:
N is carried in a signaling information;
N is pre-agreed;
N is the number of time domain symbols comprised in a slot in which the reference signal is located; or
N is the number of time domain symbols comprised in a subframe in which the reference signal is located.
7. A computer readable storage medium, comprising stored programs which, when executed by a computer, perform the following:
obtain a sequence group number of the reference signal according to the following pieces of information:
a number N of time domain symbols comprised in a time unit in which the reference signal is located; index information of time domain symbols in which the reference signal is located among the N time domain symbols comprised in the time unit; and
a time unit index obtained according to a subcarrier spacing of a bandwidth part (BWP) in which the reference signal is located;
determine the reference signal according to the sequence group number; and
transmit the reference signal;
wherein
to obtain the sequence group number of the reference signal comprises: to obtain the sequence group number of the reference signal through the following manner:
the sequence group number u=(f gh (x)+f ss )mod C;
f gh (x) is a function with respect to x, x comprises at least one of the pieces of information, C is a total number of sequence groups, f ss is obtained according to a parameter comprised in received signaling information, and
f
gh
(
x
)
=
(
∑
i
=
0
D
-
1
c
(
D
*
h
(
x
)
+
i
)
*
2
i
)
mod
C
,
wherein
h(x) is a function with respect to x, and h(x) satisfies h(l 2 , N, n s )=l 2 +n s *N,
l 2 is the index information of the time domain symbols in which the reference signal is located among the N time domain symbols comprised in the time unit, 0≤l 2 <N,
n s is the time unit index obtained according to the subcarrier spacing of the BWP in which the reference signal is located,
D is an integer equaling to 8, and
c(z) is a z-th value in a sequence generated by a random sequence function c(⋅), and z is a non-negative integer.