Method and apparatus for transmitting and receiving reference signal in wireless communication system
View Patent ↗The present invention relates to a method and an apparatus for transmitting and receiving a reference signal in a wireless communication system. In the method, in order to dynamically switch an uplink (UL) Demodulation-Reference Signal (DM-RS) according to the communication environment, such as CoMP and MU-MIMO, a parameter set for generation of a reference signal sequence is configured to include a Virtual Cell Identifier (VCID) parameter configured by information of a total of 9 bits and a cyclic shift hopping initial value parameter c init CSH , which is 9-bit information representing one integer value among 510 integer values. Therefore, it may be possible to achieve dynamic transmission or reception of a reference signal and channel estimation through the dynamic transmission or reception of the reference signal even when the communication environment dynamically changes as in a Cooperative Multiple Point transmission and reception (CoMP) scenario.
1. A method of transmitting a reference signal by a User Equipment (UE), the method comprising:
receiving an initial value;
determining a base sequence of a reference signal sequence based on a cell identifier;
initializing a pseudo-random sequence generator with a sequence initialization value;
determining a cyclic shift value of the reference signal sequence based on a pseudo-random sequence generated by the pseudo-random sequence generator; and
transmitting the reference signal based on the cyclic shift value and the base sequence,
wherein the sequence initialization value is generated based on below equation:
V
1
=
⌊
V
2
30
⌋
·
2
5
+
(
V
2
mod
30
)
,
and
in the equation, V 1 is the sequence initialization value, V 2 is the initial value, and (V 2 mod 30) denotes a modulo 30 operation on V 2 .
2. The method of claim 1 , wherein the initial value is received through a higher layer signaling.
3. The method of claim 2 , wherein the initial value is configured based on one of integer values in a range of 0 to 509.
4. The method of claim 2 , further comprising receiving the cell identifier through the higher layer signaling.
5. The method of claim 4 , wherein the cell identifier is a virtual cell identifier which is configured based on one of integer values in a range of 0to 509.
6. The method of claim 2 , wherein the cell identifier is a cell identifier which is configured based on one of integer values in a range of 0 to 503.
7. A method of receiving a reference signal by a transmission/reception point, the method comprising:
transmitting an initial value to a User Equipment (UE); and
receiving a reference signal from the UE,
wherein:
the reference signal is generated based on a cyclic shift value and a base sequence;
the base sequence is determined based on a cell identifier;
the cyclic shift value is determined based on a pseudo-random sequence generated by a pseudo-random sequence generator;
the pseudo random sequence generator is initialized with a sequence initialization value;
the sequence initialization value is generated based on below equation:
V
1
=
⌊
V
2
30
⌋
·
2
5
+
(
V
2
mod
30
)
;
and
in the equation, V 1 is the sequence initialization value, V 2 is the initial value, and (V 2 mod 30) denotes a modulo 30 operation on V 2 .
8. The method of claim 7 , wherein the initial value is transmitted through a higher layer signaling.
9. The method of claim 8 , wherein the initial value is configured based on one of integer values in a range of 0 to 509.
10. The method of claim 8 , further comprising transmitting the cell identifier through the higher layer signaling.
11. The method of claim 10 , wherein the cell identifier is a virtual cell identifier which is configured based on one of integer values in a range of 0to 509.
12. The method of claim 8 , wherein the cell identifier is a cell identifier which is configured based on one of integer values in a range of 0 to 503.
13. An apparatus to transmit a reference signal, the apparatus comprising:
a receiver that receives an initial value;
a reference signal processor that determines a base sequence of a reference signal sequence based on a cell identifier, initializes a pseudo-random sequence generator with a sequence initialization value, determines a cyclic shift value of the reference signal sequence based on a pseudo-random sequence generated by the pseudo-random sequence generator; and
a transmitter that transmits the reference signal based on the cyclic shift value and the base sequence,
wherein the sequence initialization value is generated based on below equation:
V
1
=
⌊
V
2
30
⌋
·
2
5
+
(
V
2
mod
30
)
,
and
in the equation, V 1 is the sequence initialization value, V 2 is the initial value, and (V 2 mod 30) denotes a modulo 30 operation on V 2 .
14. The apparatus of claim 13 , wherein the receiver receives the initial value through a higher layer signaling.
15. The apparatus of claim 14 , wherein the initial value is configured based on one of integer values in a range of 0 to 509.
16. The apparatus of claim 14 , wherein the receiver further receives the cell identifier through the higher layer signaling.
17. The apparatus of claim 16 , wherein the cell identifier is a virtual cell identifier which is configured based on one of integer values in a range of 0 to 509.
18. The apparatus of claim 14 , wherein the cell identifier is a cell identifier which is configured based on one of integer values in a range of 0 to 503.