MOBILE TERMINAL APPARATUS AND RADIO BASE STATION APPARATUS

Title:

MOBILE TERMINAL APPARATUS AND RADIO BASE STATION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2010/053044

Kind Code:

A1

Abstract:

Provided are a mobile terminal apparatus and a radio base station apparatus wherein even if there exists a control delay, an optimum feedback parameter is used to transmit a downstream signal, thereby improving the throughput characteristic of a downstream channel. A mobile terminal apparatus (1) uses a received signal to determine a feedback parameter to be used for a radio base station apparatus (3), thereby acquiring a feedback value. The mobile terminal apparatus (1) then predicts a feedback parameter to be used after a control delay in which the acquired feedback value is reflected on the transmission over a downstream shared channel, thereby acquiring a feedback predicted value. The mobile terminal apparatus (1) then transmits the feedback predicted value to the radio base station apparatus. The radio base station apparatus (3) uses the feedback predicted value to select a precoding weight of a MIMO channel transmission and also uses the feedback predicted value to schedule the downstream shared channel.

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Inventors:

KISHIYAMA YOSHIHISA (JP)
TAOKA HIDEKAZU (JP)
TANNO MOTOHIRO (JP)

Application Number:

PCT/JP2009/068591

Publication Date:

May 14, 2010

Filing Date:

October 29, 2009

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Assignee:

NTT DOCOMO INC (JP)
KISHIYAMA YOSHIHISA (JP)
TAOKA HIDEKAZU (JP)
TANNO MOTOHIRO (JP)

International Classes:

H04W24/10; H04B7/04; H04J11/00; H04J99/00; H04W16/28; H04W72/12

Domestic Patent References:

WO2007111266A1

2007-10-04

Foreign References:

JP2006081172A	2006-03-23
JP2008236428A	2008-10-02
JP2006279635A	2006-10-12
JP2007511169A	2007-04-26

Other References:

"Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8", 3GPP, TS 36.211 (V.8.4.0, September 2008 (2008-09-01)
"Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and channel coding (Release 8", 3GPP, TS 36.212 (V.8.4.0, September 2008 (2008-09-01)
"Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 8", 3GPP, TS 36.213 (V.8.4.0, September 2008 (2008-09-01)

Attorney, Agent or Firm:

AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)

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