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, by a user equipment, an uplink signal, the method comprising:
generating, by the user equipment, a reference signal (PUSCH RS) for demodulation of a physical uplink shared channel (PUSCH) carrying data of the user equipment; and
transmitting, by the user equipment, the PUSCH and the PUSCH RS,
wherein the PUSCH RS is generated from a base sequence with a base sequence number v in a base sequence group with a sequence group number u among a plurality of base sequence groups, each of which consists of one or more base sequences,
wherein the sequence group number u of the base sequence for the PUSCH RS is determined by a group hopping pattern f gh and a sequence-shift pattern f ss PUSCH according to u=(f gh +f ss PUSCH )mod30,
wherein the base sequence for the PUSCH RS is determined using a first virtual cell ID n ID PUSCH , when the first virtual cell ID n ID PUSCH for the PUSCH is provided,
wherein, when the first virtual cell ID n ID PUSCH is provided and when group hopping is enabled and sequence hopping is disabled, a pseudo-random generator used to determine the group hopping pattern f gh is initialized at a start of each radio frame according to
c
init
=
⌊
n
ID
PUSCH
30
⌋
,
the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =n ID PUSCH mod30, and the base sequence number v of the base sequence within the base sequence group u is 0,
wherein, when the first virtual cell ID n ID PUSCH is provided and when group hopping is disabled and sequence hopping is enabled, the group hopping pattern f gh is 0, the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =n ID PUSCH mod30, and a pseudo-random sequence generator used to determine the 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, and
wherein the first virtual cell ID n ID PUSCH □{0, . . . , 509}.
2. The method according to claim 1 , wherein the base sequence for the PUSCH RS is determined using a physical cell ID, N ID cell □{0, . . . , 503 }, when the first virtual cell ID n ID PUSCH is not provided,
wherein when the first virtual cell ID n ID PUSCH is not provided and when group hopping is enabled and sequence hopping is disabled, the pseudo-random generator used to determine the group hopping pattern f gh is initialized at the start of each radio frame according to
c
init
=
⌊
N
ID
cell
30
⌋
,
the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =(N ID cell +Δ ss )mod30 where Δ ss □{0, . . . , 29} provided by a higher layer, and the base sequence number v of the base sequence within the base sequence group u is 0, and
wherein, when the first virtual cell ID n ID PUSCH is not provided and when group hopping is disabled and sequence hopping is enabled, the group hopping pattern f gh is 0, the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =(N ID cell +Δ ss )mod30′, where Δ ss □{0, . . . , 29} provided by the higher layer, and the pseudo-random sequence generator used to determine the 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.
3. The method according to claim 1 , wherein the PUSCH RS is generated from a cyclic shift of the base sequence, and
wherein the cyclic shift is determined using a pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a second virtual cell ID N ID csh _ DMRS when the second virtual cell ID N ID csh _ DMRS for the PUSCH is provided, and
wherein, when the second virtual cell ID N ID csh _ DMRS is provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to
c
init
,
csh
=
⌊
N
ID
csh
_
DMRS
30
⌋
·
2
5
+
(
N
ID
csh
_
DMRS
mod
30
)
,
and
wherein the first virtual cell ID n ID PUSCH □{0, . . . , 509}.
4. The method according to claim 3 , wherein the cyclic shift is determined using the pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a physical cell ID, N ID cell □{0, . . . , 503 }, when the second virtual cell ID N ID csh _ DMRS for the PUSCH is not provided, and
wherein, when N ID csh _ DMRS is not provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to
c
init
,
csh
=
⌊
N
ID
cell
30
⌋
·
2
5
+
(
N
ID
cell
+
Δ
ss
)
mod
30
,
where Δ ss □{0, . . . , 29} provided by a higher layer.
5. A user equipment for transmitting an uplink signal, the user equipment comprising:
a receiver,
a transmitter, and
a processor configured to control the receiver and the transmitter, the processor configured to:
generate a reference signal (PUSCH RS) for demodulation of a physical uplink shared channel (PUSCH) carrying data of the user equipment; and
control the transmitter to transmit the PUSCH and the PUSCH RS,
wherein the PUSCH RS is generated from a base sequence with a base sequence number v in a base sequence group with a sequence group number u among a plurality of base sequence groups, each of which consists of one or more base sequences,
wherein the sequence group number u of the base sequence for the PUSCH RS is determined by a group hopping pattern f gh and a sequence-shift pattern f ss PUSCH according to u=(f gh +f ss PUSCH )mod30,
wherein the base sequence for the PUSCH RS is determined using a first virtual cell ID n ID PUSCH , when the first virtual cell ID n ID PUSCH for the PUSCH is provided,
wherein, when the first virtual cell ID n ID PUSCH is provided and when group hopping is enabled and sequence hopping is disabled, a pseudo-random generator used to determine the group hopping pattern f gh is initialized at a start of each radio frame according to
c
init
=
⌊
n
ID
PUSCH
30
⌋
,
the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =n ID PUSCH mod30, and the base sequence number v of the base sequence within the base sequence group u is 0,
wherein, when the first virtual cell ID n ss PUSCH is provided and when group hopping is disabled and sequence hopping is enabled, the group hopping pattern f gh is 0, the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =n ID PUSCH mod30, and a pseudo-random sequence generator used to determine the 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, and
wherein the first virtual cell ID n ID PUSCH □{0, . . . , 509}.
6. The user equipment according to claim 5 , wherein the base sequence for the PUSCH RS is determined using a physical cell ID, N ID cell □{0, . . . , 503}, when the first virtual cell ID n ID PUSCH is not provided,
wherein when the first virtual cell ID n ID PUSCH is not provided and when group hopping is enabled and sequence hopping is disabled, the pseudo-random generator used to determine the group hopping pattern f gh is initialized at the start of each radio frame according to
c
init
=
⌊
N
ID
cell
30
⌋
,
the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =(N ID cell +Δ ss )mod30, where Δ ss □{0, . . . , 29} provided by a higher layer, and the base sequence number v of the base sequence within the base sequence group u is 0, and
wherein, when the first virtual cell ID n ID PUSCH is not provided and when group hopping is disabled and sequence hopping is enabled, the group hopping pattern f gh is 0, the sequence-shift pattern f ss PUSCH is determined according to f ss PUSCH =(N ID cell +Δ ss )mod30, where Δ ss □{0, . . . , 29} provided by the higher layer, and the pseudo-random sequence generator used to determine the 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 user equipment according to claim 5 , wherein the PUSCH RS is generated from a cyclic shift of the base sequence, and
wherein the cyclic shift is determined using a pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a second virtual cell ID N ID csh _ DMRS when the second virtual cell ID N ID csh _ DMRS for the PUSCH is provided, and
wherein, when the second virtual cell ID N ID csh _ DMRS is provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to
c
init
,
csh
=
⌊
N
ID
csh
_
DMRS
30
⌋
·
2
5
+
(
N
ID
csh
_
DMRS
mod
30
)
,
and
wherein the first virtual cell ID n ID PUSCH □{0, . . . , 509}.
8. The user equipment according to claim 7 , wherein the cyclic shift is determined using the pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a physical cell ID, N ID cell □{0, . . . , 503}, when the second virtual cell ID N ID csh _ DMRS for the PUSCH is not provided, and
wherein, when N ID csh _ DMRS is not provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to
c
init
,
csh
=
⌊
N
ID
cell
30
⌋
·
2
5
+
(
N
ID
cell
+
Δ
ss
)
mod
30
,
where Δ ss □{0,. . . , 29} provided by a higher layer.