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Method and apparatus for efficient feedback in wireless communication system that supports multiple antennas

A user equipment and channel technology, applied in diversity/multi-antenna systems, communication between multiple stations, multi-frequency code systems, etc., can solve problems such as increasing system capacity

Active Publication Date: 2013-06-26
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, while a conventional system can support up to 4 transmit antennas, the new system has an extended antenna configuration that supports MIMO transmission based on 8 transmit antennas, resulting in increased system capacity

Method used

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  • Method and apparatus for efficient feedback in wireless communication system that supports multiple antennas
  • Method and apparatus for efficient feedback in wireless communication system that supports multiple antennas
  • Method and apparatus for efficient feedback in wireless communication system that supports multiple antennas

Examples

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Comparison scheme
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Embodiment 1

[0328] The present invention relates to a method for reporting CSI information capable of efficiently supporting SU-MIMO and MU-MIMO in an aperiodic CSI report reported through PUSCH. Embodiment 1 can be roughly divided into Embodiment 1-A that simultaneously reports UE-recommended CSI and restricted-rank CSI and Embodiment 1-B that reports one of UE-recommended CSI and restricted-rank CSI.

Embodiment 1-A

[0330] Embodiment 1-A relates to a method for simultaneously reporting UE-recommended CSI and rank-limited CSI.

[0331] Assuming that a rank range capable of being measured by a receiver (ie, UE) is set to rank N, the receiver calculates CQIs of rank-1 to rank-N so that it can select one rank that can maximize throughput. However, assuming that the receiver selects rank-M or higher (for example, M=3), information of a rank smaller than rank-M required for MU-MIMO transmission may be additionally reported. In this case, a rank indicator (RI) is requested if the configuration limits the rank and rank adaptation in the maximum rank is possible. If the restricted rank is set to a restricted rank such as rank-1 or rank-2, only PMI and CQI values ​​can be reported without a rank indicator (RI).

[0332] If the UE-recommended rank is set to M or less (eg, M=2), only UE-recommended CSI is reported. If the UE-recommended rank is set to M or higher (for example, M=2), not only UE-rec...

Embodiment 1-B

[0334] Embodiment 1-B relates to a method for reporting only one of UE-recommended CSI and rank-limited CSI.

[0335] If the range of ranks that can be measured by the receiver is set to rank-N, the receiver calculates CQIs of rank-1 to rank-N so that it can select one rank that can maximize throughput. However, if the receiver selects rank M or greater (eg, M=3), the transmitter may request CQI required for MU-MIMO transmission (eg, CSI of rank M or less). The transmitter may request information for ranks that are smaller than the range of ranks that can be calculated and reported by the receiver. For this operation, various embodiments of the present invention will be described in detail below.

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Abstract

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for efficient feedback in a wireless communication system that supports multiple antennas. The method for transmitting a CSI for downlink multi-carrier transmission according to one embodiment of the present invention comprises the following steps: generating a CSI which contains CQIs calculated on the basis of precoding information determined by a rank indicator (RI), a first PMI, a second PMI, and / or a combination of the first and second PMIs for one or more downlink carriers; determining the CSI to be transmitted, based on priority, if two or more CSIs collide against each other in one uplink subframe on one uplink carrier; and transmitting the determined CSI through an uplink channel.; The CSIs are classified into a first group including an RI, a second group including a first wideband PMI, a third group including a wideband CQI, and a fourth group including a sub-band CQI. If the CSI in the first group or the CSI in the second group collides against the CSI in the third group or the CSI in the fourth group, the CSI in the third group or in the fourth group may be suppressed due to the lower priority thereof.

Description

technical field [0001] The present invention relates to a wireless communication system, and more particularly to a method and apparatus for performing efficient feedback in a wireless communication system supporting multiple antennas. Background technique [0002] In general, multiple-input multiple-output (MIMO) techniques are described in detail below. In short, MIMO is an acronym for Multiple Input Multiple Output. MIMO technology uses multiple transmit (Tx) antennas and multiple receive (Rx) antennas to improve transmit / receive (Tx / Rx) efficiency, while existing technologies typically use a single transmit (Tx) antenna and a single receive (Rx) antenna . In other words, MIMO technology allows the transmitter and receiver to use multiple antennas in order to increase capacity or improve performance. If necessary, the MIMO technology may also be referred to as a multi-antenna technology. In order to correctly perform multi-antenna transmission, a MIMO system must rece...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L27/26H04L1/06H04B7/26
Inventor 高贤秀郑载薰韩承希李文一
Owner LG ELECTRONICS INC
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