METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK SIGNAL IN A MIMO WIRELESS COMMUNICATION SYSTEM

• US 20110064159A1
• Filed: 08/24/2010
• Published: 03/17/2011
• Est. Priority Date: 09/14/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Koo, Ja Ho, Ko, Hyun Soo, Ihm, Bin Chul, Lee, Moon Il, Chung, Jae Hoon
• Granted Patent: US 8,731,088 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method and apparatus for transmitting a downlink signal in a multiple input multiple output (MIMO) wireless communication system is disclosed. A method for receiving a downlink signal from a base station to a user equipment in a multiple input multiple output (MIMO) system, which supports dual layer transmission based on first and second antenna ports, comprises receiving downlink control information (DCI) through a downlink control channel; and receiving downlink data through a downlink data channel, the downlink data including one or more of a first transport block and a second transport block, wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and if the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is received.

Claims

1. A method for receiving a downlink signal from a base station to a user equipment in a multiple input multiple output (MIMO) system that supports dual layer transmission based on first and second antenna ports, the method comprising:

receiving downlink control information (DCI) through a downlink control channel; and

receiving downlink data through a downlink data channel, the downlink data including one or more of a first transport block and a second transport block,

wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and

wherein, when the downlink control information indicates that the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is received.

2. The method of claim 1, wherein the new data indicator is given by 1 bit,

wherein, when the new data indicator for the first data block has a first value, the first antenna port for the second transport block is indicated, and

wherein, when the new data indicator for the first data block has a second value, the second antenna port for the second transport block is indicated.

3. The method of claim 1, wherein the second transport block is mapped to one of first and second codewords,

wherein one codeword mapped to the second transport block is mapped to one of first and second layers, and

wherein one layer mapped to one codeword, which is mapped to the second transport block, corresponds to one of the first and second antenna ports.

4. The method of claim 1, wherein the downlink control information further includes modulation and coding scheme (MCS) and redundancy version (RV) for each of the first and second transport blocks, and one or more of the modulation and coding scheme (MCS) and the redundancy version (RV) indicate whether a corresponding transport block is disabled.

5. The method of claim 1, further comprising receiving a UE-specific reference signal for demodulating the downlink data for one or more of the first and second antenna ports.

6. The method of claim 1, wherein the downlink data channel is a physical downlink common channel (PDSCH), and the downlink control channel is a physical downlink control channel (PDSCH).

7. A method for transmitting a downlink signal from a base station to a user equipment in a multiple input multiple output (MIMO) system that supports dual layer transmission based on first and second antenna ports, the method comprising:

transmitting downlink control information (DCI) through a downlink control channel; and

transmitting downlink data through a downlink data channel, the downlink data including one or more of a first transport block and a second transport block,

wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and

wherein, when the downlink control information indicates that the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is transmitted.

8. The method of claim 7, wherein the new data indicator is given by 1 bit,

wherein, when the new data indicator for the first data block has a first value, the first antenna port for the second transport block is indicated, and

wherein, when the new data indicator for the first data block has a second value, the second antenna port for the second transport block is indicated.

9. The method of claim 7, wherein the second transport block is mapped to one of first and second codewords,

wherein one codeword mapped to the second transport block is mapped to one of first and second layers, and

wherein one layer mapped to one codeword, which is mapped to the second transport block, corresponds to one of the first and second antenna ports.

10. The method of claim 7, wherein the downlink control information further includes modulation and coding scheme (MCS) and redundancy version (RV) for each of the first and second transport blocks, and one or more of the modulation and coding scheme (MCS) and the redundancy version (RV) indicate whether a corresponding transport block is disabled.

11. The method of claim 7, further comprising transmitting a UE-specific reference signal for demodulating the downlink data for one or more of the first and second antenna ports.

12. The method of claim 7, wherein the downlink data channel is a physical downlink common channel (PDSCH), and the downlink control channel is a physical downlink control channel (PDSCH).

13. A user equipment for receiving a downlink signal from a base station in a multiple input multiple output (MIMO) system that supports dual layer transmission based on first and second antenna ports, the user equipment comprising:

a receiving module receiving control information and data from the base station;

a transmitting module transmitting control information and data to the base station; and

a processor connected with the receiving module and the transmitting module, controlling the user equipment including the receiving module and the transmitting module,

wherein the processor is configured to;

control the receiving module to receive downlink control information (DCI) through a downlink control channel, and

control the receiving module to receive downlink data through a downlink data channel, the downlink data including one or more of first and second transport blocks,

wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and

wherein, when the downlink control information indicates that the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is received.

14. A base station for transmitting a downlink signal to a user equipment in a multiple input multiple output (MIMO) system that supports dual layer transmission based on first and second antenna ports, the base station comprising:

a receiving module receiving control information and data from the user equipment;

a transmitting module transmitting control information and data to the user equipment; and

a processor connected with the receiving module and the transmitting module, controlling the base station including the receiving module and the transmitting module,

wherein the processor is configured to;

control the transmitting module to transmit downlink control information (DCI) through a downlink control channel, and

control the transmitting module to transmit downlink data through a downlink data channel, the downlink data including one or more of first and second transport blocks,

wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and

wherein, when the downlink control information indicates that the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is transmitted.