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Base station and feedback information control method in radio communication system

A technology for radio communication and feedback information, applied in radio transmission systems, diversity/multi-antenna systems, transmission systems, etc., can solve problems such as inability to obtain MU-MIMO throughput, and achieve the effect of improving throughput

Inactive Publication Date: 2013-09-11
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effect contributing to improved throughput of MU-MIMO cannot be obtained

Method used

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  • Base station and feedback information control method in radio communication system
  • Base station and feedback information control method in radio communication system
  • Base station and feedback information control method in radio communication system

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Embodiment Construction

[0030] Hereinafter, illustrative embodiments of the present invention will be described by taking radio communication between a base station and a mobile station in 3GPP LTE as an example. However, what communicates with the base station is not limited to the mobile station. A radio communication device or user equipment (UE) whose reception quality can be changed depending on the precoding matrix is ​​sufficient, and can be, for example, an immovable fixed station. In the following, by using the mobile station in the MU-MIMO system as the figure 1 An example of a radio communication device communicating with a base station shown in .

[0031] 1. First illustrative embodiment

[0032] 1.1) System

[0033] figure 2 The functional configuration of base station 100 according to the first illustrative embodiment of the present invention is shown. The base station 100 includes a subset information generation unit 107 in addition to the functions of a normal base station.

[...

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Abstract

A base station includes: a subset information generation section which selects M precoding matrices from among N precoding matrices and sets the M precoding matrices as a precoding matrix subset; a transmission section which transmits the precoding matrix subset to a radio communication device; and a reception section which receives feedback information from a radio communication device that is generated by the radio communication device, wherein the feedback information includes information abot at least one precoding matrix which is selected from the precoding matrix subset based on reception quality at the radio communication device.

Description

[0001] merge by reference [0002] This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2010-289240 filed on December 27, 2010, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The present invention relates to a radio communication system, and more particularly, to a base station and a feedback information control system for the base station in a multi-user MIMO (multi-user multiple-input multiple-output; hereinafter abbreviated as MU-MIMO) environment. Background technique [0004] In the case of applying MU-MIMO to the downlink that enables the base station to simultaneously perform radio communication with multiple mobile stations by using the same frequency, the base station performs antenna directivity control to prevent multiple mobile stations from being targeted The simultaneously transmitted signals interfere with each other. Antenna directivity is formed by multiplying a ...

Claims

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Application Information

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IPC IPC(8): H04J99/00H04B7/04
CPCH04B7/0634H04B7/0639H04B7/0665
Inventor 小柳宪治石井直人
Owner NEC CORP
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