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 extending and transmitting a reference signal generated by using a cyclic shift (CS), the method comprising:
receiving a basic CS parameter and an extended CS parameter;
determining an extended CS based on a function of the received basic CS parameter and the received extended CS parameter;
generating a reference signal by using the determined extended CS; and
transmitting the generated reference signal,
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 ).
2. The method as claimed in 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 as claimed in claim 1 , wherein generating the SRS comprises:
generating an SRS sequence by multiplying r u,v (n) corresponding to a previously-generated base sequence by e jαn , when α corresponding to the extended CS is calculated;
mapping the SRS sequence into a time-frequency resource domain; and
generating a signal including the mapped SRS by using a signal generator.
4. A method for transmitting a cyclic shift (CS) parameter for extending a reference signal generated by using a CS, the method comprising:
determining a basic CS parameter and an extended CS parameter based on the number of reference signals requiring support; and
transmitting the determined basic CS parameter and the determined extended CS parameter,
wherein the 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.
5. The method as claimed in claim 4 , wherein whether the 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.
6. The method as claimed in claim 4 , wherein the basic CS parameter corresponds to one of integer values from 0 to 7, which are represented by 3 bits, and the extended CS parameter corresponds to either 0 or 1, which is represented by 1 bit.
7. An apparatus for extending and transmitting a reference signal generated by using a cyclic shift (CS), the apparatus comprising:
a transmitter/receiver for receiving a basic CS parameter and an extended CS parameter, and transmitting a generated reference signal;
an extended CS determiner for determining an extended CS based on the received basic CS parameter and the received extended CS parameter; and
a reference signal generator for generating a reference signal by using the determined extended CS,
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(m SRS CS , n SRS,extend CS ).
8. An apparatus for transmitting a cyclic shift (CS) parameter for extending a reference signal generated by using a CS, the apparatus comprising:
a CS parameter setter for setting a basic CS parameter and an extended CS parameter based on the number of reference signals requiring support; and
a transmitter for transmitting the set basic CS parameter and the set extended CS parameter,
wherein the 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.
9. A method for extending and transmitting a reference signal generated by using a cyclic shift (CS), the method comprising:
receiving a basic CS parameter and an extended CS parameter;
determining an extended CS based on a function of the received basic CS parameter and the received extended CS parameter;
generating a reference signal by using the determined extended CS; and
transmitting, by a wireless transceiver, the generated reference signal,
wherein the reference signal corresponds to a sounding reference signal (SRS), and wherein generating the SRS comprises:
generating an SRS sequence by multiplying r u,v (n) corresponding to a base sequence by e jαn , when α corresponding to the extended CS is calculated;
mapping the SRS sequence into a time-frequency resource domain; and generating a signal including the mapped SRS by using a signal generator.