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Communication device and communication system based on multi-carrier transmission mode

A communication device and communication system technology, applied in the field of communication systems, can solve the problems of reducing transmission efficiency, changing subcarrier bandwidth, and not being able to simply change subcarriers, etc.

Inactive Publication Date: 2017-03-01
FUJITSU CONNECTED TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also because it is a common control channel shared by all users, once the subcarrier used is changed, it will affect all users
Therefore it is not possible to simply change the subcarrier of the shared control channel
[0019] 3) In Patent Document 3 (Japanese Patent Laid-Open No. 2004-214746), although the bandwidth of the data channel is variable, the common control channel still uses a fixed frequency band shared by all users, and has the same characteristics as in Patent Document 2 above. question
As a result, users with poor transmission conditions are dragged down, and the bandwidth of the subcarrier is continuously widened, which reduces the transmission efficiency
Therefore, changing the bandwidth of the subcarrier has the disadvantage that it may not be an effective means

Method used

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  • Communication device and communication system based on multi-carrier transmission mode
  • Communication device and communication system based on multi-carrier transmission mode
  • Communication device and communication system based on multi-carrier transmission mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0094] [Embodiment 1: Setting of use frequency band]

[0095] First, some features disclosed in the first embodiment will be described below. The main points of this feature lie in the following three points (i) to (iii) as already described.

[0096] (i) Set a specific frequency band from a plurality of frequency bands formed by dividing the entire frequency band allocated to the communication system, and use the specific frequency band to determine whether the remaining communication devices should be used between communication devices (10, 20). (ii) set the specific frequency band as the "main frequency band" in the entire frequency band, and the main frequency band transmits data information in addition to the use of frequency band information If (Du), (iii) At least one frequency band set among the above-mentioned multiple frequency bands except the above-mentioned "main frequency band" is used as an "extended frequency band", and this extended frequency band is mainly u...

no. 2 Embodiment approach

[0148] [Second embodiment: dynamic change of main frequency band]

[0149] Some features disclosed first in this second embodiment are shown below.

[0150] i) The frequency band that should be occupied by the main frequency band among the plurality of frequency bands (frequency band 1 to frequency band 4) can be changed over time,

[0151] ii) judging whether the propagation environment between the communication devices (10, 20) is good or bad, selecting the frequency band with the best propagation environment among the above-mentioned plurality of frequency bands or setting the frequency band corresponding to the best propagation environment as the main frequency band,

[0152] iii) When setting a new main frequency band, notify the counterpart communication device of the change of the frequency band in advance,

[0153] iv) between the communication devices, using the detection result of the transmission quality (CQI) obtained in response to the transmitted pilot channel o...

Embodiment approach 3

[0191] [Embodiment 3: Dynamic change of extended frequency band]

[0192] First, some features disclosed in the third embodiment will be described below.

[0193] i) making it possible to change the frequency band set as the extended frequency band among the plurality of frequency bands (frequency band 1 to frequency band 4) over time,

[0194] ii) Judging whether the propagation environment between the communication devices (10, 20) is good or bad, selecting a frequency band corresponding to the best propagation environment among the plurality of frequency bands and setting it as an extended frequency band.

[0195] iii) Furthermore, when establishing a wireless link, a frequency band usable by the communication device (10, 20) is limited, and a main frequency band and an extended frequency band are dynamically assigned within the limited frequency band.

[0196] iv) Notifying the communication device of the other party in advance of the setting information of the frequency ...

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Abstract

The invention provides communication devices and a communication system based on a multi-carrier transmission mode. The communication devices are contained in the communication system which carries out information exchange among the communication devices in the multi-carrier transmission mode using a series of subcarriers. Each communication device comprises a sending data generating part, the sending data generating part generates used frequency band information which indicates a used frequency band selected from a plurality of frequency bands formed by division of a whole frequency band assigned on the communication system, and the used frequency band is used for carrying out mutual transmission of data information among the communication devices, wherein the communication devices send the used frequency band information through using of a set specific frequency band in the frequency bands, and the specific frequency band can be changed along with time and is used for being switched to another frequency band of the frequency bands.

Description

[0001] This application is a branch of a patent application whose filing date is October 29, 2004, application number is 200480044327.3 (international application number is PCT / JP2004 / 016154), and the title of the invention is "communication device and communication system based on multi-carrier transmission mode". case application. technical field [0002] The present invention relates to a communication system for exchanging information (data) between communication devices using a multi-carrier transmission method using a series of subcarriers, and more particularly to a communication device incorporated in the communication system. Background technique [0003] As the above-mentioned communication system discussed in the present invention, the most preferable example is a mobile communication system, and the following description will take this mobile communication system as an example. Therefore, according to this example, the above-mentioned communication device is (i) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/08H04L27/26H04W72/00H04L5/00
Inventor 大出高义河崎义博川端和生
Owner FUJITSU CONNECTED TECH LTD
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