Method and apparatus for transmitting uplink signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-9723598-B2
Application number	US-201314376365-A
Country	US
Kind code	B2
Filing date	Feb 20, 2013
Priority date	Feb 20, 2012
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

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.

First claim

The invention claimed is:

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 PUS

Assignees

• Lg Electronics Inc

Inventors

• Park Jonghyun
• Seo Hanbyul
• Kim Kijun
• Kim Byounghoon

Classifications

• H04B7/2603

  Arrangements for wireless physical layer control (H04B7/2612 takes precedence) · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L5/0012

  Hopping in multicarrier systems · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title