Method and apparatus for uplink multiple input multiple output (MIMO) transmission

Patent metadata

Field	Value
Publication number	US-9287942-B2
Application number	US-201113638775-A
Country	US
Kind code	B2
Filing date	Apr 27, 2011
Priority date	Apr 27, 2010
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

The present description relates to a wireless communication system, and more particularly, to a method and apparatus for uplink multiple input multiple output (MIMO) transmission. A method for performing an uplink MIMO transmission according to one embodiment of the present invention comprises the following steps: transmitting, from a first subframe, a first data block and a second data block through a first HARQ process and a second HARQ process, respectively; receiving, at a second subframe, uplink scheduling control information on the first data block and control information which indicates inactivation of the second data block; setting HARQ feedback information on the second data block to an ACK state; and performing retransmission of the first data block from a third subframe on the basis of the uplink scheduling control information on the first data block. Retransmission of the second data block may not be performed until uplink scheduling control information on the second data block is received.

First claim

The invention claimed is:

1. A method for performing uplink MIMO transmission, the method comprising:
transmitting a first data block and a second data block at a first subframe through a first HARQ process and a second HARQ process, respectively;
receiving, at a second subframe, uplink scheduling control information on the first data block and control information which indicates disabling of the second data block;
setting a HARQ feedback information state on the second data block to an ACK state; and
performing retransmission of the first data block at a third subframe on the basis of the uplink scheduling control information on the first data block,
wherein retransmission of the second data block is not performed until uplink scheduling control information on the second data block is received, and
wherein the HARQ feedback information state on the second data block is set to the ACK state regardless whether any HARQ feedback information is indicated or HARQ feedback information indicates NACK state or ACK state.

2. The method according to claim 1 , wherein a new data indicator (NDI) of the uplink scheduling control information on the first data block received at the second subframe has a value that is not toggled as compared to previous transmission of the first HARQ process.

3. The method according to claim 1 , further comprising:
receiving uplink scheduling control information on the second data block after the third subframe; and
performing retransmission of the second data block on the basis of the uplink scheduling control information on the second data block.

4. The method according to claim 1 , wherein the uplink scheduling control information on the first data block and the uplink scheduling control information on the second data blocks are received through physical downlink control channels (PDCCHs), and the first and second data blocks are transmitted through physical uplink shared channels (PUSCHs).

5. The method according to claim 1 , wherein the second subframe comes after four subframes from the first subframe and the third subframe comes after four subframes from the second subframe.

6. A UE for performing uplink MIMO transmission, the UE comprising:
a physical layer module including a reception module for receiving uplink scheduling control information from an eNB and a transmission module for performing initial transmission or retransmission of a first data block and a second data block; and
a medium access control (MAC) layer module including a plurality of HARQ processes including a HARQ entity, a first HARQ process and a second HARQ process which are managed by the HARQ entity,
wherein the MAC layer module is configured to control the transmission module to transmit the first data block and the second data block at a first subframe through the first HARQ process and the second HARQ process, respectively, and to control the transmission module to perform retransmission of the first data block at a third subframe on the basis of uplink scheduling control information on the first data block when the uplink scheduling control information on the first data block is received at a second subframe through the reception module,
wherein the physical layer module transmits an acknowledgement (ACK) signal for the second data block to the MAC layer module when control information which indicates disabling of the second data block is received at the second subframe,
wherein the MAC layer module sets a HARQ feedback information state on the second data block to an ACK state and controls retransmission of the second data block not to be performed until uplink scheduling control information on the second data block is received, and
wherein the HARQ feedback information state on the second data block is set to the ACK state regardless whether any HARQ feedback information is indicated or HARQ feedback information indicates NACK state or ACK state.

7. The UE according to claim 6 , wherein a new data indicator (NDI) of the uplink scheduling control information on the first data block received at the second subframe has a value that is not toggled as compared to previous transmission of the first HARQ process.

8. The UE according to claim 6 , wherein, when uplink scheduling control information on the second data block is received after the third subframe, the MAC layer module controls the transmission module to perform retransmission of the second data block on the basis of the uplink scheduling control information on the second data block.

9. The UE according to claim 6 , wherein the uplink scheduling control information on the first data block and the uplink scheduling control information on the second data blocks are received through physical downlink control channels (PDCCHs), and the first and second data blocks are transmitted through physical uplink shared channels (PUSCHs).

10. The UE according to claim 6 , wherein the second subframe comes after four subframes from the first subframe and the third subframe comes after four subframes from the second subframe.

Assignees

• Kang Byeong Woo
• Roh Dong Wook
• Lee Dae Won
• Noh Yu Jin
• Kim Bong Hoe
• Seo Dong Youn
• Lg Electronics Inc

Inventors

• Kang Byeong Woo
• Roh Dong Wook
• Lee Dae Won
• Noh Yu Jin
• Kim Bong Hoe
• Seo Dong Youn

Classifications

• H04B7/0486

  taking channel rank into account · CPC title

• H04L1/1822

  involving configuration of automatic repeat request [ARQ] with parallel processes · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title

• H04L25/03929

  with layer mapping, e.g. codeword-to layer design (for space-time coding H04L1/0618) · CPC title

• H04L1/0061

  Error detection codes · CPC title