Method and apparatus for transmitting and receiving reference signal in wireless communication system
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 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 communication method comprising:
receiving, at a User Equipment (UE), a message through Radio Resource Control (RRC) signaling, wherein the message comprises a virtual cell identifier parameter and a cyclic shift hopping initial parameter;
generating, at the UE, a base sequence at least based on the virtual cell identifier parameter;
determining an initial value of a pseudo random sequence relating to a cyclic shift hopping based on the received cyclic shift hopping initial value parameter;
determining a cyclic shift value based on the determined initial value of the pseudo random sequence relating to the cyclic shift hopping;
generating, at the UE, a demodulation reference signal at least by cyclically shifting the base sequence at least based on the determined cyclic shift value; and
transmitting, at the UE, the demodulation reference signal,
wherein the initial value c init of the pseudo random sequence relating to the cyclic shift hopping is determined according to the received cyclic shift CSH hopping initial value parameter c init CSH by
c
init
=
⌊
c
init
CSH
30
⌋
·
2
5
+
(
c
init
CSH
mod
30
)
,
wherein the cyclic shift hopping initial value is configured based on one of integer values in a range 0 to 509, and
wherein the virtual cell identifier is configured based on one of integer in a range of 0 to 509.
2. The method of claim 1 , wherein the demodulation reference signal is transmitted on a Physical Uplink Shared Channel (PUSCH).
3. A communication apparatus comprising:
a memory; and
a processor operably coupled the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to:
support the communication apparatus to receive a message through Radio Resource Control (RRC) signaling, wherein the message comprises a virtual cell identifier parameter and a cyclic shift hopping initial parameter;
generate a base sequence at least based on the virtual cell identifier parameter;
determine an initial value of a pseudo random sequence relating to a cyclic shift hopping based on the received cyclic shift hopping initial value parameter;
determine a cyclic shift value based on the determined initial value of the pseudo random sequence relating to the cyclic shift hopping;
generate a demodulation reference signal at least by cyclically shifting the base sequence at least based on the determined cyclic shift value; and
support the communication apparatus to transmit the demodulation reference signal,
wherein the initial value c init of the pseudo random sequence relating to the cyclic shift hopping is determined according to the received cyclic shift CSH hopping initial value parameter c init CSH by
c
init
=
⌊
c
init
CSH
30
⌋
·
2
5
+
(
c
init
CSH
mod
30
)
,
wherein the cyclic shift hopping initial value is configured based on one of integer values in a range 0 to 509, and
wherein the virtual cell identifier is configured based on one of integer in a range of 0 to 509.
4. The apparatus of claim 3 , wherein the demodulation reference signal is transmitted on a Physical Uplink Shared Channel (PUSCH).
5. A communication device for a User Equipment (UE), comprising:
a memory; and
a processor operably coupled the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to:
support the UE to receive a message through Radio Resource Control (RRC) signaling, wherein the message comprises a virtual cell identifier parameter and a cyclic shift hopping initial parameter;
generate a base sequence at least based on virtual cell identifier parameter;
determine an initial value of a pseudo random sequence relating to a cyclic shift hopping based on the received cyclic shift hopping initial value parameter;
determine a cyclic shift value based on the determined initial value of the pseudo random sequence relating to the cyclic shift hopping;
generate a demodulation reference signal at least by cyclically shifting the base sequence at least based on the determined cyclic shift value; and
support the UE to transmit the demodulation reference signal,
wherein the initial value c init of the pseudo random sequence relating to the cyclic shift hopping is determined according to the received cyclic shift CSH hopping initial value parameter c init CSH by
c
init
=
⌊
c
init
CSH
30
⌋
·
2
5
+
(
c
init
CSH
mod
30
)
,
wherein the cyclic shift hopping value is configured based on one of integer values in a range 0 to 509, and
wherein the virtual cell identifier is configured based on one of integer in a range of 0 to 509.
6. The device of claim 5 , wherein the demodulation reference signal is transmitted on a Physical Uplink Shared Channel (PUSCH).