Method and apparatus for transmitting uplink signal in wireless communication system
The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting an uplink signal. A method for transmitting an uplink signal at a UE in a wireless communication system includes, when a virtual cell ID for a reference signal for demodulation of a physical uplink channel is provided, generating a sequence of the reference signal on the basis of the virtual cell ID, and transmitting the generated reference signal to an eNB. A group hopping pattern of the reference signal can be determined on the basis of the virtual cell ID.
1. A method for transmitting an uplink signal at a user equipment, UE, in a wireless communication system, the method comprising:
when a virtual cell ID, n ID PUSCH , for a first reference signal for demodulation of a physical uplink shared channel, PUSCH, is provided, generating, by the UE, the reference signal based on the n ID PUSCH ; and
transmitting, by the UE, the generated reference signal,
wherein, when n ID PUSCH is provided and sequence group hopping for the reference signal is enabled, a pseudo-random sequence generator used to determine a group hopping pattern for the reference signal is initialized according to
c
init
=
⌊
n
ID
PUSCH
30
⌋
at the start of each radio frame based on n ID PUSCH instead of a physical layer cell ID, N ID cell ε{0, . . . ,503},
wherein n ID PUSCH ε{0, . . . ,509} is provided by a higher layer.
2. The method according to claim 1 ,
wherein, when n ID PUSCH is provided, a sequence shift pattern f ss PUSCH of the reference signal is determined according to f ss PUSCH =n ID PUSCH mod30,
wherein mod denotes a modulo operation.
3. The method according to claim 2 , wherein, when n ID PUSCH is provided, the sequence group hopping for the reference signal is disabled and the sequence hopping is enabled, a pseudo-random sequence generator used to determine a base sequence number v is initialized according to
c
init
=
⌊
n
ID
PUSCH
30
⌋
·
2
5
+
f
ss
PUSCH
at the start of each radio frame.
4. The method according to claim 1 , wherein, when n ID PUSCH is not provided, the pseudo-random sequence generator used to determine the group hopping pattern for the reference signal is initialized according to
c
init
=
⌊
N
ID
cell
30
⌋
.
5. The method according to claim 4 ,
wherein, when n ID PUSCH is not provided, the sequence shift pattern f ss PUSCH of the reference signal is determined according to f ss PUSCH =(N ID cell =Δ ss ) mod30,
wherein Δ ss ε{0,1, . . . ,29} is provided by the higher layer.
6. The method according to claim 5 , wherein, when n ID PUSCH is not provided, the sequence group hopping for the reference signal is disabled and the sequence hopping is enabled, a pseudo-random sequence generator used to determine a base sequence number v is initialized according to
c
init
=
⌊
N
ID
cell
30
⌋
·
2
5
+
f
ss
PUSCH
at the start of each radio frame.
7. The method according to claim 1 , wherein the reference signal is transmitted on a single carrier frequency division multiple access, SC-FDMA, symbol in a slot in which the PUSCH is transmitted.
8. A user equipment, UE, for transmitting an uplink signal, comprising:
a receiver;
a transmitter; and
a processor configured to control the receiver and the transmitter, the processor configured to:
when a virtual cell ID n ID PUSCH for a reference signal for demodulation of a physical uplink shared channel, PUSCH, is provided, generate the reference signal based on the n ID PUSCH ; and
control the transmitter to transmit the generated reference signal,
wherein, when N ID PUSCH is provided and sequence group hopping for the reference signal is enabled, a pseudo-random sequence generator used to determine a group hopping pattern for the reference signal is initialized according to
c
init
=
⌊
n
ID
PUSCH
30
⌋
at the start of each radio frame based on n ID PUSCH instead of a physical layer cell ID, N ID cell ε{0, . . . ,503}, and
wherein n ID PUSCH ε{0, . . . ,509}is provided by a higher layer.
9. The UE according to claim 8 ,
wherein, when n ID PUSCH is provided, a sequence shift pattern f ss PUSCH of the reference signal is determined according to f ss PUSCH =n ID PUSCH mod30,
wherein mod denotes a modulo operation.
10. The UE according to claim 9 , wherein, when n ID PUSCH is provided, the sequence group hopping for the reference signal is disabled and the sequence hopping is enabled, a pseudo-random sequence generator used to determine a base sequence number v is initialized according to
c
init
=
⌊
n
ID
PUSCH
30
⌋
·
2
5
+
f
ss
PUSCH
at the start of each radio frame.
11. The UE according to claim 8 , wherein, when n ID PUSCH is not provided, the pseudo-random sequence generator used to determine the group hopping pattern for the reference signal is initialized according to
c
init
=
⌊
N
ID
cell
30
⌋
.
12. The UE according to claim 11 ,
wherein, when n ID PUSCH is not provided, the sequence shift pattern f ss PUSCH of the reference signal is determined according to f ss PUSCH =(N ID cell =Δ ss )mod30,
wherein Δ ss ε{0,1, . . . ,29} is provided by the higher layer.
13. The UE according to claim 12 , wherein, when n ID PUSCH is not provided, the sequence group hopping for the reference signal is disabled and the sequence hopping is enabled, a pseudo-random sequence generator used to determine a base sequence number v is initialized according to
c
init
=
⌊
N
ID
cell
30
⌋
·
2
5
+
f
ss
PUSCH
at the start of each radio frame.
14. The UE according to claim 8 , wherein the reference signal is transmitted on a single carrier frequency division multiple access, SC-FDMA, symbol in a slot in which the PUSCH is transmitted.