Apparatus and method for transmitting a reference signal in a wireless communication system
View Patent ↗The present specification relates to a method/apparatus for extending and transmitting a reference signal, and to a method and apparatus for transmitting a cyclic shift (hereinafter, referred to as CS) parameter. In generating the extended reference signal, the CS is determined as a function for both a basic CS parameter and an extended CS parameter.
1. A method for transmitting a reference signal, comprising:
receiving, by a first apparatus, a basic cyclic shift (CS) parameter and an extended CS parameter, the basic CS parameter being selected from a predetermined integer set of {0, 1, 2, 3, 4, 5, 6, 7};
determining, by the first apparatus, an extended CS based on the received basic CS parameter and the received extended CS parameter;
generating, by the first apparatus, a sound reference signal (SRS) sequence by using the determined extended CS and by multiplying r u,v (n) corresponding to a base sequence by e jαn , when α corresponding to the extended CS is calculated;
mapping, by the first apparatus, the SRS sequence into a time-frequency resource domain;
generating, by the first apparatus, a SRS including the mapped SRS by using a signal generator; and
transmitting, by the first apparatus, the generated SRS to a second apparatus.
2. The method of claim 1 , wherein the basic CS parameter comprises 3 bits, and the extended CS parameter comprises a 1-bit signal representing 0 or 1.
3. The method of claim 1 , wherein the reference signal corresponds to a sounding reference signal (SRS), and the extended CS is determined by
α
(
n
SRS
CS
,
n
SRS
,
extend
CS
)
=
2
π
(
n
SRS
CS
+
n
SRS
,
extend
CS
/
2
)
8
,
and
n
SRS
,
extend
CS
∈
{
0
,
1
}
,
α
(
n
SRS
CS
,
n
SRS
,
extend
CS
)
=
2
π
(
n
SRS
CS
(
n
SRS
,
extend
CS
+
1
)
+
n
SRS
,
extend
CS
/
2
)
8
,
and
n
SRS
,
extend
CS
∈
{
0
,
1
}
,
or
α
(
n
SRS
CS
,
n
SRS
,
extend
CS
)
=
2
π
(
n
SRS
CS
(
n
SRS
,
extend
CS
+
1
)
+
3
n
SRS
,
extend
CS
/
2
)
8
,
and
n
SRS
,
extend
CS
∈
{
0
,
1
}
,
when the basic CS parameter is n SRS CS , the extended CS parameter is n SRS,extend CS , and the extended CS isα(n SRS CS ,n SRS,extend CS ).
4. The method of claim 1 , wherein a number of reference signals requiring support in the second apparatus corresponds to a number of multiplexing CS factors which are to be simultaneously transmitted in a state where CS values are caused to differ from each other.
5. The method of claim 1 , wherein the extended CS parameter is determined based on a number of antennas for SRS transmission.
6. An apparatus for transmitting a reference signal, comprising:
a transmitter/receiver for receiving a basic cyclic shift (CS) parameter and an extended CS parameter, the basic CS parameter being selected from a predetermined integer set of {0, 1, 2, 3, 4, 5, 6, 7};
an extended CS determiner for determining an extended CS based on the received basic CS parameter and the received extended CS parameter;
a signal generation unit for generating a sound reference signal (SRS) sequence by using the determined extended CS and by multiplying r u,v (n) corresponding to a base sequence by e jαn , when a corresponding to the extended CS is calculated;
a signal mapping unit for mapping the SRS sequence into a time-frequency resource domain;
a signal generation unit for generating a SRS including the mapped SRS by using a signal generator; and
a transmitter/receiver for transmitting the generated SRS to another apparatus.
7. The apparatus of claim 6 , wherein the basic CS parameter comprises 3 bits, and the extended CS parameter comprises a 1-bit signal representing 0 or 1.
8. The apparatus of claim 6 , wherein the reference signal corresponds to a sounding reference signal (SRS), and the extended CS is determined by
α
(
n
SRS
CS
,
n
SRS
,
extend
CS
)
=
2
π
(
n
SRS
CS
+
n
SRS
,
extend
CS
/
2
)
8
,
and
n
SRS
,
extend
CS
∈
{
0
,
1
}
,
α
(
n
SRS
CS
,
n
SRS
,
extend
CS
)
=
2
π
(
n
SRS
CS
(
n
SRS
,
extend
CS
+
1
)
+
n
SRS
,
extend
CS
/
2
)
8
,
and
n
SRS
,
extend
CS
∈
{
0
,
1
}
,
or
α
(
n
SRS
CS
,
n
SRS
,
extend
CS
)
=
2
π
(
n
SRS
CS
(
n
SRS
,
extend
CS
+
1
)
+
3
n
SRS
,
extend
CS
/
2
)
8
,
and
n
SRS
,
extend
CS
∈
{
0
,
1
}
,
when the basic CS parameter is n SRS CS , the extended CS parameter is n SRS,extend CS , and the extended CS is α(n SRS CS , n SRS,extend CS ).
9. The apparatus of claim 6 , wherein a number of reference signals requiring support in said another apparatus corresponds to a number of multiplexing CS factors which are to be simultaneously transmitted in a state where CS values are caused to differ from each other.
10. The apparatus of claim 6 , wherein the extended CS parameter is determined based on a number of antennas for SRS transmission.
11. A method for transmitting a cyclic shift (CS) parameter, comprising:
determining, by a first apparatus, a basic CS parameter and an extended CS parameter based on a number of reference signals;
transmitting, by the first apparatus, the determined basic CS parameter and the determined extended CS parameter to a second apparatus; and
receiving a sound reference signal (SRS) from a second apparatus, the SRS being by, the second apparatus, generated based on an extended CS which is, by the second apparatus, determined based on the basic CS parameter and the extended CS parameter,
wherein the basic CS parameter is selected from a predetermined integer set of {0, 1, 2, 3, 4, 5, 6, 7}, and the extended CS parameter corresponds to either 0 or 1, which is represented by 1 bit.
12. The method of claim 11 , wherein whether a number of the multiplexing CS factors exceeds a predetermined threshold is identified, and when the identified number of the multiplexing CS factors exceeds the predetermined threshold, a value of the extended CS parameter is set as “0” for multiplexing CS factors, the number of which is equal to the predetermined threshold or is less than the predetermined threshold, and a value of the extended CS parameter is set as 1 for remaining multiplexing CS factors.
13. The method of claim 11 , wherein a number of the reference signals requiring the support corresponds to the number of multiplexing CS factors which are to be simultaneously transmitted in a state where CS values are caused to differ from each other.
14. The method of claim 11 , wherein the extended CS parameter is determined based on a number of antennas for SRS transmission.