Base station apparatus, communication terminal apparatus, and communication method

a technology of communication terminal and base station, which is applied in the direction of data switching network, frequency-division multiplex, wireless commuication services, etc., can solve the problems of transmission efficiency decline communication quality degrade, etc., and achieve high transmission efficiency

Active Publication Date: 2012-08-28
OPTIS WIRELESS TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Maintains high transmission efficiency even in environments affected by frequency selective fading by optimizing subcarrier usage based on individual terminal conditions.

Problems solved by technology

Here, the communication quality of some bands may degrade due to frequency selective fading.
However, as the above-described conventional base station and communication terminals perform communication using the entire band, a problem is that communication quality degrades and transmission efficiency falls in a band affected by frequency selective fading.

Method used

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

Examples

Experimental program
Comparison scheme
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embodiment 1

(Embodiment 1)

[0024]FIG. 3 is a block diagram showing the configuration of a base station according to Embodiment 1 of the present invention.

[0025]In FIG. 3, an assignment section 101 determines communication resource assignment to each communication terminal based on a transmission rate at which communication is possible for each subcarrier of each communication terminal estimated by a channel estimation section 114 to be described below, and gives instructions to a buffer section 102 for forward transmission data output. The assignment section 101 also instructs a frame creation section 103 to perform forward transmission data symbolization, and outputs a signal indicating communication resource assignment to each communication terminal (hereinafter referred to as “resource assignment signal”). In addition, the assignment section 101 indicates to a spreading section 104 a spreading code to be multiplied by the forward transmission data.

[0026]The buffer section 102 holds forward tr...

embodiment 2

(Embodiment 2)

[0074]FIG. 7 is a block diagram showing the configuration of a base station according to Embodiment 2 of the present invention.

[0075]Parts identical to those in FIG. 3 are assigned the same reference numerals as in FIG. 3 and their detailed explanations are omitted.

[0076]The base station apparatus in FIG. 7 comprises a plurality of spreading sections 502, 512, 522, and a plurality of frame creation sections 501, 511, 521, and differs from the base station in FIG. 3 in that a signal with a low spreading ratio is transmitted in a band with good communication quality, and a signal with a high spreading ratio is transmitted in a band with poor communication quality due to the effects of frequency selective fading, etc.

[0077]In FIG. 7, an assignment section 101 determines communication resource assignment to each communication terminal based on a transmission rate at which communication is possible for each subcarrier of each communication terminal estimated by a channel es...

embodiment 3

(Embodiment 3)

[0088]FIG. 9 is a block diagram showing the configuration of a communication terminal according to Embodiment 3 of the present invention. Parts identical to those in FIG. 4 are assigned the same reference numerals as in FIG. 4 and their detailed explanations are omitted.

[0089]In FIG. 9, an SIR determination section 701 finds the ratio of the interference component to a signal in another band based on a received pilot signal, and outputs the result to a transmission rate calculation section 207 as an SIR.

[0090]In addition, the SIR determination section 701 determines a signal that meets a predetermined threshold value from among received signals to be a signal for communication with that station and outputs it to a P / S conversion section 212, and discards signals that do not meet the predetermined threshold value as interference signals.

[0091]By estimating communication quality for each subcarrier in each communication terminal and transmitting data from the base statio...

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PUM

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Abstract

An assignment section 101 determines communication resource assignment to communication terminals based on a transmission rate at which communication is possible for each subcarrier of each communication terminal, and instructs a buffer section 102 to output forward transmission data. In addition, the assignment section 101 instructs a frame creation section 103 to perform forward transmission data symbolization, and also outputs a signal indicating communication resource assignment to each communication terminal. The buffer section 102 holds forward transmission data, and outputs forward transmission data to the frame creation section 103 in accordance with instructions from the assignment section 101. The frame creation section 103 symbolizes a resource assignment signal and transmission data to create a frame, which it outputs to a spreading section 104.

Description

TECHNICAL FIELD[0001]The present invention relates to a base station apparatus, communication terminal apparatus, and communication method.BACKGROUND ART[0002]In a cellular communication system, one base station performs radio communication with a plurality of communication terminals simultaneously, and therefore, as demand has increased in recent years, so has the need for higher transmission efficiency.[0003]One technology for increasing the transmission efficiency of a downlink from a base station to a communication terminal is HDR (High Data Rate). HDR is a method whereby scheduling for assigning communication resources to communication terminals is performed by time division, and data transmission efficiency is further improved by setting the transmission rate for each communication terminal according to the communication quality. This method is suitable for connection via the Internet and the like.[0004]The operations performed by a base station and communication terminals in ...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H04W72/00H04J1/00H04J3/16H04L5/02H04W28/00H04W72/54H04W88/02H04W88/08H04W88/14H04W92/10
CPCH04J3/1682H04L5/026H04W28/22
InventorSUMASU, ATSUSHIKATO, OSAMUUESUGI, MITSURUSAITO, YOSHIKOUE, TOYOKIAIZAWA, JUNICHIKITAGAWA, KEIICHIUEHARA, TOSHIYUKISHI, GUIZENG
OwnerOPTIS WIRELESS TECH LLC