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Base station apparatus, communication terminal apparatus, and multicarrier communication method

A technology for communication terminals and base stations, which is applied to communication between multiple stations, wireless communication, and selection of devices, etc. Effects of Frequency Utilization Efficiency

Inactive Publication Date: 2008-07-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when this technology is applied to a multi-carrier communication system with a high transmission rate such as OFDM (Orthogonal Frequency Division Multiplex), there will be a problem in that, since the number of channels increases and the number of communication terminals accommodated also increases, it is necessary to report to the base station. The amount of CQI information becomes huge, and the amount of overhead (overhead) on the uplink increases, which reduces communication efficiency.

Method used

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  • Base station apparatus, communication terminal apparatus, and multicarrier communication method
  • Base station apparatus, communication terminal apparatus, and multicarrier communication method
  • Base station apparatus, communication terminal apparatus, and multicarrier communication method

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Embodiment approach 1

[0053] FIG. 1 is a block diagram showing the main configuration of a base station apparatus according to Embodiment 1 of the present invention. Here, a closed-loop communication system in which MCS parameters are selected and transmitted for each subchannel will be described as an example. In addition, a subchannel is a general term for a frequency band composed of one or more subcarriers, and is a control unit for frequency scheduling (frequency allocation) and adaptive modulation.

[0054] The base station apparatus according to this embodiment is mainly composed of a transmitting unit 100 , a receiving unit 100 and an antenna 120 . Wherein, the sending unit 100 includes: a switching unit 101, an encoding unit 102, a modulation unit 103, an IFFT unit 104, a GI insertion unit 105, and an RF sending unit 106, and the receiving unit 110 includes: an RF receiving unit 111, a GI removing unit 112, and an FFT unit 113 , demodulation unit 114 , decoding unit 115 , CQI extraction u...

Embodiment approach 2

[0120] The base station apparatus according to Embodiment 2 of the present invention instructs a communication terminal having a low transmission rate to report CQIs of a predetermined number of subchannels with good reception quality among all subchannels.

[0121] The basic configuration of the base station apparatus according to this embodiment is the same as the base station apparatus proposed in Embodiment 1, so its description is omitted, and an allocation control information generation unit having a different configuration will be described below. In addition, structural elements whose basic operation is the same but whose details are different are indicated by adding lowercase letters to the same reference numerals.

[0122] FIG. 16 is a block diagram showing the main configuration of the distribution control information generation unit 117a of this embodiment. In addition, this allocation control information generating section 117a has the same basic configuration as ...

Embodiment approach 3

[0156] Compared with the base station device proposed in Embodiment 2, the base station device in Embodiment 3 of the present invention has more format indication information, that is, a variant of the CQI reporting manner.

[0157] Specifically, in the CQI reporting method and format indication information, in addition to what is mentioned in Embodiment 2, the following is added, that is, the indication "report the CQI of the allocated subchannel and the reception quality outside the allocated frequency band "CQI reporting method for CQI of good n subchannels" format indication information "3", and format indication information "4" indicating "CQI reporting method for reporting CQI of the same subchannel as the previous CQI report".

[0158] In addition, the base station apparatus of this embodiment also has more variations than that of Embodiment 2 with respect to reception fluctuation determination information.

[0159] Specifically, in Embodiment 2, the reception fluctuati...

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Abstract

A multicarrier communication method capable of improving the frequency utilization efficiency and the throughput of the communication system, while satisfying the QoS. A communication terminal reports the CQI about all of the subchannels included in the bandwidth of a communication channel during a first CQI report, as shown in the upper figure portion. Unlike the first report, during the second and following CQI reports, in which much time is left in terms of the permissible delay time, the communication terminal reports the CQI only about subchannels 1 and 2 assigned by the second and following frequency assignments, as shown in the lower figure portion.

Description

technical field [0001] The present invention relates to a base station device, a communication terminal device, and a multi-carrier communication method. Background technique [0002] There is a technology in wireless communication systems, that is, in order to obtain high throughput, communication terminals report channel quality information called CQI (Channel Quality Indicator) to the base station, and the base station determines the modulation parameters for transmission based on the reported CQI ( MCS: Modulation Coding Scheme) technology. [0003] However, when this technology is applied to a multi-carrier communication system with a high transmission rate such as OFDM (Orthogonal Frequency Division Multiplex), there will be a problem in that, since the number of channels increases and the number of communication terminals accommodated also increases, it is necessary to report to the base station. The information amount of the CQI becomes huge, and the amount of overh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B7/26H04J11/00H04W72/54H04W28/24
CPCH04L27/261H04L1/0027H04W28/24H04L1/20H04J11/00
Inventor 栗谦一今村大地西尾昭彦
Owner PANASONIC CORP
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