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Communication device based on multi-carrier transmission mode

A technology of communication device and transmission method, which is applied in the field of communication system, and can solve problems such as widened subcarrier bandwidth, inability to simply change subcarriers, and user impact

Active Publication Date: 2015-04-08
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 based on multi-carrier transmission mode
  • Communication device based on multi-carrier transmission mode
  • Communication device based on multi-carrier transmission mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0093] [Embodiment 1: Setting of used frequency band]

[0094] First, some features disclosed in the first embodiment are shown below. The main points of this feature, as already introduced, are the following three points (i) to (iii).

[0095] (i) A specific frequency band is set from a plurality of frequency bands formed by dividing the entire frequency band allocated to the communication system. Using the specific frequency band will determine whether the remaining communication devices should use each other (10, 20) The "used frequency band information" If of a certain frequency band is transmitted, (ii) the specific frequency band is set as the "main frequency band" in the entire frequency band, and the main frequency band transmits data information in addition to the frequency band information If (Du), (iii) At least one frequency band set from among the above-mentioned multiple frequency bands except the above-mentioned "main frequency band" is set as an "expansion frequenc...

no. 2 Embodiment approach

[0147] [Second Embodiment: Dynamic Change of Main Band]

[0148] The following shows some of the features initially disclosed in this second embodiment.

[0149] i) The frequency band that should be occupied by the main frequency band among multiple frequency bands (band 1 to frequency band 4) can be changed over time,

[0150] ii) Determine the quality of the propagation environment between the communication devices (10, 20), select the frequency band of the best propagation environment or the frequency band equivalent to the best propagation environment among the above multiple frequency bands to set the main frequency band,

[0151] iii) When the main frequency band is newly set, notify the other communication device of the change of the frequency band in advance,

[0152] iv) Between communication devices, use the transmission quality (CQI) detection result obtained in response to the transmitted pilot channel or pilot signal to determine the quality of the above-mentioned propagati...

Embodiment approach 3

[0190] [Embodiment 3: Dynamic Change of Expanded Band]

[0191] First, some features disclosed in the third embodiment are shown below.

[0192] i) The frequency band set as the expansion band among the multiple frequency bands (band 1 to band 4) can be changed with the passage of time,

[0193] ii) It is judged whether the propagation environment between the communication devices (10, 20) is good or bad, and the frequency band corresponding to the best propagation environment among the plurality of frequency bands is selected and set as the extended frequency band.

[0194] iii) When establishing a wireless line, the frequency band that can be used by the communication device (10, 20) is limited, and the main frequency band and the expansion frequency band are dynamically allocated within the limited frequency band.

[0195] iv) The communication device of the other party is also notified in advance of the setting information of the frequency band that should be set as the expansion fr...

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Abstract

The invention provides a communication device. The communication device is contained in a communication system for performing information exchange between communication devices in a multi-carrier transmission mode in which a plurality of sub carriers are used. The communication device comprises a receiver; the receiver is configured to receive frequency band information by using a special frequency band selected from a plurality of frequency bands distributed to the communication system; the frequency band information comprises the using frequency band of at least one frequency band excepting the special frequency band; the using frequency band is used for transmitting data information between the communication devices, wherein after the frequency band information is received by the receiver, the receiver receives the data information by using the using frequency band indicated by the frequency band information, after the special frequency band is converted into another frequency band in frequency bands, the converted special frequency band is configured into a principal frequency band in the distributed frequency bands, and the receiver receives the frequency band information and also receives the data information by using the principal frequency band.

Description

[0001] This application is the division of the patent application whose application date is October 29, 2004, the application number is 200480044327.3 (the international application number is PCT / JP2004 / 016154), and the invention title 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 that exchanges information (data) between communication devices through a multi-carrier transmission method using a series of subcarriers, and particularly relates to a communication device housed in the communication system. Background technique [0003] As the above-mentioned communication system discussed in the present invention, one of the most preferable examples is a mobile communication system, and the following description will take this mobile communication system as an example. Therefore, according to this example, the aforementioned communication dev...

Claims

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Application Information

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