Operation of terminal for multi-antenna transmission

• US 8,767,646 B2
• Filed: 02/10/2010
• Issued: 07/01/2014
• Est. Priority Date: 02/11/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Seung Hee, Chung, Jae Hoon, Ko, Hyun Soo, Lee, Moon Il, Kwon, Yeong Hyeon
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US13/148,936
• Publication Number:
  US 20120008577A1
• Time in Patent Office: 1,602 Days
• Field of Search: 370/329, 375/219
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0686 Hybrid systems, i.e. switching and simultaneous transmission
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path

Abstract

Embodiments of the present invention relate to a method and an apparatus for enabling a terminal to transmit a signal in a wireless communication system. According to one embodiment, a signal transmission method includes: receiving configuration information for multi-antenna transmission from a base station; configuring a multi-antenna transmission mode in accordance with the received configuration information; and transmitting an uplink channel having a plurality of symbols to the base station through multiple antennas.

Claims

1. A method of transmitting a demodulation reference signal (DMRS) for a Physical Uplink Shared Channel (PUSCH) at a User Equipment (UE) in a radio communication system, the method comprising:

receiving a Physical Downlink Control Channel (PDCCH) signal for the PUSCH, wherein the PDCCH signal includes a 3-bit index related to Cyclic Shift (CS) for the DMRS, the 3-bit index indicating a value;

determining a plurality of CS parameters based on the value of the 3-bit index and a number of layers, wherein a number of the plurality of CS parameters is equal to the number of layers;

determining a plurality of CS values α

_λ

based on the plurality of CS parameters by using the equation α

_λ

=2π

·

n_CS,λ

/12, wherein n_CS,λ

is a λ

^th CS parameter of the plurality of CS parameters, λ

is an integer in a range from 0 to N−

1, and N is the number of layers; and

generating a plurality of DMRS sequences based on the plurality of CS values α

_λ

by using the expression e<sup>j·

α

λ

·

n</sup>·

r_u,v(n), wherein r_u,v(n) is a base sequence, u is a group number, v is a base sequence number within a corresponding group, n is an integer in a range from 0 to N_sc^RS−

1, and N_sc^RS is a number of allocated subcarriers.

2. The method of claim 1,

wherein the 3-bit index has a plurality of values including the value, and

wherein a corresponding plurality of CS parameters is predefined per each value of the plurality of values.

3. The method of claim 1, wherein one or more of the plurality of DMRS sequences are for demodulation of a corresponding one or more of the layers of the PUSCH.

4. The method of claim 1, further comprising transmitting the plurality of DMRS sequences for the PUSCH.

5. A method of receiving a demodulation reference signal (DMRS) for a Physical Uplink Shared Channel (PUSCH) at a Base Station (BS) in a radio communication system, the method comprising:

transmitting a Physical Downlink Control Channel (PDCCH) signal for the PUSCH, wherein the PDCCH signal includes a 3-bit index related to Cyclic Shift (CS) for the DMRS, the 3-bit index indicating a value; and

receiving a plurality of DMRS sequences for the PUSCH,

wherein a plurality of CS parameters are determined based on the value of the 3-bit index and a number of layers,

wherein a number of the plurality of CS parameters is equal to the number of layers,

wherein a plurality of CS values α

_λ

are determined based on the plurality of CS parameters by using the equation α

_λ

=2π

·

n_CS,λ

/12, wherein n_CS,λ

is a λ

^th CS parameter of the plurality of CS parameters, λ

is an integer in a range from 0 to N−

1, and N is the number of layers, and

wherein the plurality of DMRS sequences are defined based on the plurality of CS values α

_λ

by using the expression e<sup>j·

α

λ

·

n</sup>·

r_u,v(n), wherein r_u,v(n) is a base sequence, u is a group number, v is a base sequence number within a corresponding group, n is an integer in a range from 0 to N_sc^RS−

1, and N_sc^RS is a number of allocated subcarriers.

6. The method of claim 5,

wherein the 3-bit index has a plurality of values including the value, and

wherein a corresponding plurality of CS parameters is predefined per each value of the plurality of values.

7. The method of claim 5, further comprising demodulating the PUSCH using the plurality of DMRS sequences.

8. The method of claim 7, wherein one or more of the plurality of DMRS sequences are used for demodulation of a corresponding one or more of the layers of the PUSCH.

9. A User Equipment (UE) for transmitting demodulation reference signal (DMRS) for a Physical Uplink Shared Channel (PUSCH) in a radio communication system, the UE comprising:

a Radio Frequency (RF) unit; and

a processor configured to;

receive a Physical Downlink Control Channel (PDCCH) signal for the PUSCH, wherein the PDCCH signal includes a 3-bit index related to Cyclic Shift (CS) for the DMRS, the 3-bit index indicating a value;

determine a plurality of CS parameters based on the value of the 3-bit index and a number of layers, wherein a number of the plurality of CS parameters is equal to the number of layers;

determine a plurality of CS values α

_λ

based on the plurality of CS parameters by using the equation α

_λ

=2π

·

n_CS,λ

/12, wherein n_CS,λ

is a λ

^th CS parameter of the plurality of CS parameters, λ

is an integer in a range of 0 to N−

1, and N is the number of layers; and

generate a plurality of DMRS sequences based on the plurality of CS values α

_λ

by using the expression e<sup>j·

α

λ

·

n</sup>·

r_u,v(n), wherein r_u,v(n) is a base sequence, u is a group number, v is a base sequence number within a corresponding group, n is an integer in a range from 0 to N_sc^RS−

1, and N_sc^RS is a number of allocated subcarriers.

10. The UE of claim 9,

wherein the 3-bit index has a plurality of values including the value, and

wherein a corresponding plurality of CS parameters is predefined per each value of the plurality of values.

11. The UE of claim 9, wherein one or more of the plurality of DMRS sequences are for demodulation of a corresponding one or more of the layers of the PUSCH.

12. The UE of claim 9, wherein the processor is further configured to transmit the plurality of DMRS sequences for the PUSCH.

13. A Base Station (BS) for receiving demodulation reference signal (DMRS) for a Physical Uplink Shared Channel (PUSCH) in a radio communication system, the BS comprising:

a Radio Frequency (RF) unit; and

a processor configured to;

transmit a Physical Downlink Control Channel (PDCCH) signal for the PUSCH, wherein the PDCCH signal includes a 3-bit index related to Cyclic Shift (CS) for the DMRS, the 3-bit index indicating a value; and

receive a plurality of DMRS sequences for the PUSCH,

wherein a plurality of CS parameters are determined based on the value of the 3-bit index and a number of layers,

wherein a number of the plurality of CS parameters is equal to the number of layers,

wherein a plurality of CS values α

_λ

are determined based on the plurality of CS parameters by using the equation α

_λ

=2π

·

n_CS,λ

/12, wherein n_CS,λ

is a λ

^th CS parameter of the plurality of CS parameters, λ

is an integer in a range from 0 to N−

1, and N is the number of layers, and

wherein the plurality of DMRS sequences are defined based on the plurality of CS values α

_λ

by using the expression e<sup>j·

α

λ

·

n</sup>·

r_u,v(n), wherein r_u,v(n) is a base sequence, u is a group number, v is a base sequence number within a corresponding group, n is an integer in a range from 0 to N_sc^RS−

1, and N_sc^RS is a number of allocated subcarriers.

14. The BS of claim 13,

wherein the 3-bit index has a plurality of values including the value, and

wherein a corresponding plurality of CS parameters is predefined per each value of the plurality of values.

15. The BS of claim 13, wherein the processor is further configured to demodulate the PUSCH using the plurality of DMRS sequences.

16. The BS of claim 15, wherein one or more of the plurality of DMRS sequences are used for demodulation of a corresponding one or more of the layers of the PUSCH.