JP2008178078A - Radio communication apparatus and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To flexibly and effectively utilize a frequency band in a radio communication system, in which there are allocated all or a part of frequency bands usable in a cell, as a usable frequency band in each of a plurality of regions in the cell. <P>SOLUTION: An allocation control part 15 of a radio communication apparatus 1 allocates all frequency bands f1 to f6 usable in a cell 1 as a frequency band usable in an inside region, allocates a specific frequency band among all the frequency bands f1 to f6 usable in the cell 1 as a frequency band usable in the outer region, and in fields B1 to B3 that correspond to an outer region, in a data frame the specified frequency band that is usable in the outer region is notified, by using a bit map pattern. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus and a wireless communication method.

  Conventionally, a wireless communication system using a frequency division multiple access scheme such as OFDMA (Orthogonal Frequency Division Multiple Access) is known.

  In a wireless communication system using such a frequency division multiple access scheme, when there are three adjacent cells, for example, there is a configuration (see FIG. 10) in which each cell 1 to 3 uses the same frequency band (fMHz). There is known a configuration (see FIG. 11) in which the frequency band (fMHz) is logically divided into three and each divided frequency band (f / 3 MHz) is assigned to each of the cells 1 to 3.

  In the former configuration (see FIG. 10), since a plurality of cells 1 to 3 use an entire certain frequency band, the peak throughput can be improved to the maximum, but the same frequency band is also used in adjacent cells. There is a problem that inter-cell interference is likely to occur.

  On the other hand, in the latter configuration (see FIG. 11), since different frequency bands are used between adjacent cells, it is easy to suppress inter-cell interference, but since a certain frequency band is divided into three, this can be achieved. There is a problem that the upper limit of the peak throughput is 1/3 of the case where the entire frequency band is used.

Therefore, as shown in FIG. 12, each of the cells 1 to 3 is divided into an outer region and an inner region, and all the frequency bands F1 to F3 usable in each cell are provided in the inner region with less interference from other cells. A configuration has been proposed in which frequency bands F1 to F3 used separately in each cell are allocated to an outer region where interference from other cells is large (see Patent Document 1).
Japanese Patent Laid-Open No. 2005-80286

  However, in the above-described conventional technology, it is necessary to determine in advance whether to allocate all or some of the frequency bands that can be used in each cell to each of a plurality of regions in each cell. It was.

  That is, in the above-described prior art, when a specific frequency band is pre-assigned to a certain area, subchannels in other frequency bands can be used in such area regardless of traffic conditions. There is a problem that the frequency band cannot be used flexibly and effectively.

  Therefore, in view of the above problems, the present invention is configured to allocate all or some of the frequency bands usable in the cell as usable frequency bands in each of a plurality of regions in the cell. It is an object of the present invention to provide a wireless communication apparatus and a wireless communication method capable of flexibly and effectively using a frequency band in a wireless communication system.

  A first feature of the present invention is that it is arranged in a radio communication system configured to use a frequency division multiplexing method as a modulation method, realize a frequency division multiple access method, and divide a cell into an inner region and an outer region. A wireless communication device configured to allocate a usable frequency band in the inner region and the outer region, and to construct a data frame for transmitting a data burst using a subchannel in the allocated frequency band. An allocation control unit configured, wherein the allocation control unit allocates all frequency bands usable in the cell as frequency bands that can be used in the inner area, and as frequency bands that can be used in the outer area. , And is configured to allocate a specific frequency band out of all frequency bands that can be used in the cell, and the allocation control unit includes the data In field corresponding to the outer region in the frame, using the bitmap pattern, and summarized in that it is configured to notify the specific frequency band available in the outer region.

  In the first feature of the present invention, the cell is configured to be divided into a plurality of outer regions, and the data frame has a field corresponding to each of the divided outer regions. It may be configured.

  In the first aspect of the present invention, the bitmap pattern is configured by a bit string corresponding to all frequency bands usable in the cell, and can be used in the outer region by each bit constituting the bit string. You may be comprised so that a specific frequency band may be shown.

  A second feature of the present invention is that a radio arranged in a radio communication system configured to use a frequency division multiplexing scheme as a modulation scheme, realize a frequency division multiple access scheme, and divide a cell into a plurality of regions. A communication device is configured to allocate a usable frequency band in each of the plurality of regions and to construct a data frame for transmitting a data burst using a subchannel in the allocated frequency band. An allocation control unit is provided, and the allocation control unit is configured to determine which of the plurality of regions the mobile terminal should belong to according to communication quality information received from the mobile terminal existing in the cell. The allocation control unit is configured to allocate a usable frequency band in each of the plurality of regions according to the communication quality information. Is that the gist of that.

  A third feature of the present invention is that a radio frequency system arranged in a radio communication system configured to use a frequency division multiplexing scheme as a modulation scheme, realize a frequency division multiple access scheme, and divide a cell into a plurality of regions. A communication device is configured to allocate a usable frequency band in each of the plurality of regions and to construct a data frame for transmitting a data burst using a subchannel in the allocated frequency band. An allocation controller, wherein the allocation controller is configured to manage communication quality classes of mobile terminals belonging to each of the plurality of regions, and the allocation controller is provided to each of the plurality of regions. Depending on the number of mobile terminals to which the mobile terminal belongs and the communication quality class of mobile terminals belonging to each of the plurality of areas, the field corresponding to each of the plurality of areas in the data frame. And summarized in that it is configured to change the field size.

  In the second or third aspect of the present invention, the cell is configured to be divided into an inner region and an outer region, and the allocation control unit is configured to use the frequency band usable in the inner region as the frequency band. All frequency bands usable in the cell may be allocated, and a specific frequency band out of all frequency bands usable in the cell may be allocated as the frequency band usable in the outer region.

  A fourth feature of the present invention is that a radio in a radio communication system configured to use a frequency division multiplexing scheme as a modulation scheme, realize a frequency division multiple access scheme, and divide a cell into an inner region and an outer region. In the communication method, the radio communication device allocates a frequency band that can be used in the inner area and the outer area, and constructs a data frame that transmits a data burst using a subchannel in the allocated frequency band. In the step, the wireless communication device allocates all frequency bands usable in the cell as frequency bands usable in the inner area, and uses the frequency bands usable in the outer area as the frequency bands usable in the outer area. A specific frequency band of all frequency bands usable in the cell is allocated, and in the step, the wireless communication device In field corresponding to the outer region in the frame, using the bitmap pattern, and gist to notify the specific frequency band available in the outer region.

  According to the present invention, in a radio communication system configured to allocate all or some of the frequency bands usable in the cell as usable frequency bands in each of a plurality of regions in the cell, A wireless communication apparatus and a wireless communication method capable of flexibly and effectively using a band can be provided.

  Next, some embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic.

(First embodiment of the present invention)
A radio communication system according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7.

  The radio communication system according to the first embodiment of the present invention is a multi-user communication system that uses an orthogonal frequency division multiplexing (OFDM) scheme as a modulation scheme.

  In the wireless communication system according to the present embodiment, an orthogonal frequency division multiple access (OFDMA) scheme is achieved by assigning a part of a plurality of subcarriers included in one communication path to one mobile terminal (user). It has been realized.

  In addition, a wireless communication system to which the OFDMA scheme is applied is configured to transmit and receive data at high speed using a subchannel having at least one subcarrier.

  In addition, the wireless communication system according to the present embodiment is configured to divide each cell into a plurality of regions (for example, an inner region and an outer region).

  In the example of FIG. 1, the wireless communication system according to the present embodiment is configured to divide the cell 1 into an outer area Zone1, Zone2, Zone3, and an inner area Zone4.

  In the example of FIG. 1, in the cell 1, the base station 1 (wireless communication apparatus) is arranged, the mobile terminal UE1 belongs to the inner area Zone4, and the mobile terminal UE2 belongs to the outer area Zone2. The mobile terminal UE3 belongs to the outer area Zone1.

  As shown in FIG. 2, the base station 1 according to the present embodiment includes an antenna 10, a receiving unit 11, a frequency converting unit 12, an OFDM demodulating unit 13, a primary demodulating unit 14, an allocation control unit 15, A modulation unit 16, a frequency conversion unit 17, a transmission unit 18, and an antenna 19 are provided.

  The receiving unit 11 is configured to receive an uplink signal transmitted from the mobile terminal UE existing in the cell 1 via the antenna 10.

  The frequency conversion unit 12 is configured to perform frequency conversion processing on the uplink signal received by the reception unit 11.

  The OFDM demodulator 13 is configured to perform OFDM demodulation processing on the signal output from the frequency converter 12.

  The primary demodulation unit 14 is configured to perform primary demodulation processing on the signal output from the OFDM demodulation unit 13.

  The allocation control unit 15 allocates frequency bands that can be used in each of a plurality of areas in the cell 1 (for example, the inner area Zone 4 and the outer areas Zone 1 to 3), and performs data using subchannels in the allocated frequency band. It is configured to construct a data frame for transmitting a burst.

  In the IEEE 802.16e standard, “FUSC (Full Usage of Subchannel) method” and “PUSC (Partial Usage of Subchannel) method” are defined as subchannel configuration methods.

  The FUSC scheme is a scheme in which subchannels are configured using all subcarriers allocated for data burst transmission in all frequency bands usable in each cell.

  On the other hand, the PUSC scheme is a scheme in which subchannels are configured using only some of the subcarriers allocated for data burst transmission within all frequency bands usable in each cell. .

  In the present embodiment, the allocation control unit 15 is configured using a “PUSC (Partial Usage of Subchannel) scheme” compliant with the IEEE 802.16e standard, and configures subchannels as sub bursts for downlink burst data transmission to each mobile terminal UE. It is configured to be assigned as a channel.

  Here, a data frame defined in the IEEE 802.16e standard will be described with reference to FIG.

  In the configuration of the data frame shown in FIG. 3, the horizontal axis indicates the number of the OFDMA symbol, and the vertical axis indicates the logical number of the subchannel.

  As illustrated in FIG. 3, the downlink data frame includes a “preamble” and a “frame control header (FCH)” following the preamble.

  In addition, “DL-MAP” and “UL-MAP (included in DL Burst # 1)” included in the downlink data frame are respectively used for the downlink data frame and the uplink data frame. It includes mapping information of data bursts (DL Burst and UL Burst) in the data frame.

  In the present embodiment, it is assumed that the frequency band that can be used in the cell 1 is logically divided into, for example, six frequency bands f1 to f6, and the divided frequency bands are denoted by f1 and f2, respectively. , F3, f4, f5, f6.

  Further, “FCH” includes information specifying which frequency band should be used among the frequency bands logically divided as described above in the field including “FCH”.

  In the example of FIG. 3, “FCH” includes information specifying that the frequency bands f1 and f3 should be used in the field 1.

  In addition, when the PUSC scheme defined in the IEEE 802.16e specification is used in a field including “FCH”, the mobile terminal UE is located in an area (for example, Zone 1 or the like) in a cell corresponding to the field. As long as the frequency band is specified, the frequency band designated by “FCH” is used.

  Further, when the cell is divided into a plurality of areas, that is, as shown in FIG. 4, when the downlink data frame is divided into a plurality of fields 1 and 2, in each area, the cell 1 Information specifying whether to use all available frequency bands or to use a specific (partial) frequency band among the frequency bands that can be used in the cell 1 needs to be held in the data frame. .

  Here, in general, when the PUSC method defined in the IEEE 802.16e specification is used in a downlink data frame (all fields), it is included in “ZONE Switch IE” which is an information element of “DL-MAP”. Depending on whether the “Use All SC indicator” bit is set to “1” or “0”, the entire frequency band usable in the cell 1 is used in the area corresponding to each field, or the cell 1 It is set whether to use a specific (partial) frequency band among the usable frequency bands.

  For example, in the example of FIG. 4, in the field 2 where “Use All SC indicator” = 1 is set, all frequency bands f1 to f6 usable in the cell 1 are set to be used.

  In the example of FIG. 4, in the field 1 in which “Use All SC indicator” = 0 is set, a specific (partial) frequency band (a part of all frequency bands f1 to f6 that can be used in the cell 1 ( The frequency band designated by “FCH”) is set to use f3 and f6.

  As shown in FIG. 5, the allocation control unit 15 allocates all frequency bands f1 to f6 that can be used in the cell 1 as frequency bands that can be used in the inner area Zone4, and is used in each of the outer areas Zone1 to Zone3. As a possible frequency band, a specific (partial) frequency band among all the frequency bands f1 to f6 usable in the cell 1 is allocated.

  For example, in the examples of FIGS. 5 and 6, the assignment control unit 15 assigns specific frequency bands f0 and f1 as frequency bands that can be used in the outer area Zone1, and uses specific frequencies as frequency bands that can be used in the outer area Zone2. Bands f0, f1, and f3 are allocated, and specific frequency bands f0, f1, f3, and f5 are allocated as frequency bands that can be used in the outer area Zone3.

  That is, as illustrated in FIG. 5 and FIG. 6, the allocation control unit 15 sets “Use All SC indicator” = 1 in the field A corresponding to the inner region Zone4, thereby setting the mobile terminals UE belonging to the inner region Zone4. On the other hand, the inside region Zone4 is configured to notify that all the frequency bands f1 to f6 usable in the cell 1 can be used.

  On the other hand, the allocation control unit 15 applies the bitmap pattern ( For example, using the “Sub-Channel (SC) Bitmap”) that is a syntax included in “ZONE Switch IE”, a specific frequency band that can be used in each of the outer regions Zone 1 to 3 is notified. ing.

  Such a bitmap pattern is composed of bit strings (bit strings consisting of 6 bits in the example of FIG. 7) corresponding to all frequency bands f1 to f6 that can be used in the cell 1, and each bit constituting the bit string is outside. It is configured to indicate a specific frequency band that can be used in the zones 1 to 3.

  As shown in FIG. 7, it means that the frequency bands f3 and f6 can be used in the outer region corresponding to the field set to “001001” in “Sub-Channel (SC) Bitmap”.

  Here, in the field corresponding to the area determined not to allocate all the frequency bands usable in the cell 1, the allocation control unit 15 uses “Sub-Channel (SC) instead of“ Use All SC indicator ”. "Bitmap" may be set.

  Also, the assignment control unit 15 sets “Use All SC indicator” = “0” in the field corresponding to the area determined not to assign all the frequency bands usable in the cell 1, and then sets “Sub”. -Channel (SC) Bitmap "may be set.

  Further, the allocation control unit 15 may be configured to set “Sub-Channel (SC) Bitmap” even in a field corresponding to an area determined to allocate all frequency bands usable in the cell 1. Good. In such a case, the allocation control unit 15 sets “1” for all bits of “Sub-Channel (SC) Bitmap”.

  The allocation control unit 15 is configured to send the constructed data frame to the modulation unit 16.

  The modulation unit 16 is configured to modulate the data frame transmitted from the allocation control unit 15.

  The frequency conversion unit 17 is configured to perform frequency change processing on the signal output from the modulation unit 16.

  The transmission unit 18 is configured to transmit the signal output from the frequency conversion unit 17 to each mobile terminal UE via the antenna 19.

  According to the base station 1 according to the present embodiment, in the wireless communication system in which the cell 1 is divided into the inner area Zone4 and the outer areas Zone1 to Zone3, “Use All SC indicator” = 1 in the field corresponding to the inner area Zone4. By using the “Sub-Channel (SC) Bitmap” in the field corresponding to each of the outer areas Zone1 to Zone3, the use of all frequency bands f1 to f6 usable in the cell 1 is notified. Since a data frame for notifying a specific frequency band that can be used in each of the outer regions Zone 1 to 3 can be constructed, flexible and effective use of the frequency band can be achieved.

  Further, according to the base station 1 according to the present embodiment, even when the outer region of the cell is divided into a plurality of regions, a specific frequency band can be assigned to each of the plurality of regions. The frequency band can be used flexibly and effectively.

  Furthermore, according to the base station 1 according to the present embodiment, by using the “Sub-Channel (SC) Bitmap” that holds each bit in correspondence with the usable frequency band, the usable frequency band in each region Can be set easily.

(Second Embodiment)
Hereinafter, the radio communication system according to the present embodiment will be described mainly with respect to differences from the radio communication system according to the first embodiment described above.

  In the radio communication system according to the present embodiment, the cell is configured to be divided into a plurality of zones 1 to 4 as shown in FIG.

  8A and 8B, the field 2 in the data frame corresponds to the area Zone1, the field 4 in the data frame corresponds to the area Zone2, and the field in the data frame 3 corresponds to the area Zone3.

  The allocation control unit 15 is configured to determine which of the multiple zones Zone1 to 4 the mobile terminals UE1 to UE4 should belong to according to communication quality information received from the mobile terminals UE1 to UE4 existing in the cell 1 Has been.

  Specifically, the allocation control unit 15 determines that the mobile terminals UE having close communication quality information belong to the same area.

  As the communication quality information, for example, CQI (Channel Quality Information) in the downlink can be used. Examples of CQI include CINR (Carrier-to-Interference plus Noise Ratio), RSSI (Receiver Signal Strength Indicator), RTD (Round Trip Delay), and the like.

  Further, the allocation control unit 15 is configured to allocate a frequency band that can be used in each of the plurality of zones 1 to 3 according to the communication quality information described above.

  Specifically, the allocation control unit 15 determines that the communication quality information (for example, the average value of the communication quality information of mobile terminals belonging to the region) is worse than a predetermined condition (for example, CINR is lower than a predetermined threshold). For the region to which the mobile terminal belongs, the number of usable frequency bands is reduced (for example, corresponding to a field in which the usable frequency band is less than a predetermined threshold), and the communication quality information (for example, for mobile terminals belonging to the region) For the region to which the mobile terminal UE to which the average value of communication quality information) is better than a predetermined condition (for example, CINR is higher than a predetermined threshold), the number of usable frequency bands is increased (for example, usable frequencies). Corresponding to a field having a bandwidth greater than a predetermined threshold).

  Also in this embodiment, the allocation control unit 15 allocates all frequency bands that can be used in the cell as frequency bands that can be used in the inner area, and can be used in the cell as frequency bands that can be used in the outer area. It may be configured to allocate a specific frequency band among all the frequency bands.

  In such a case, the allocation control unit 15 may be configured to allocate a usable frequency band in each of the plurality of outer regions according to the communication quality information described above.

(Third embodiment)
Hereinafter, the wireless communication system according to the present embodiment will be described mainly with respect to differences from the wireless communication system according to the second embodiment described above.

  In the present embodiment, the allocation control unit 15 is configured to manage communication quality (QoS: Quality of Service) classes of mobile terminals UE belonging to each of the plurality of zones 1 to 3.

  In the present embodiment, such communication quality classes include “ErtPS (weighting coefficient: 5)”, “UGS (weighting coefficient: 4)”, “rtPS (weighting coefficient: 3)”, and “nrtPS (weighting coefficient). : 2) "and" BE (weighting coefficient: 1) "can be set.

  In the example of FIG. 9A, the communication quality classes of the mobile terminals UE belonging to the area Zone1 are “rtPS” and “UGS”, and the communication quality classes of the mobile terminals UE belonging to the area Zone2 are “ErtPS” and “BE ( The best communication quality class of the mobile terminal UE belonging to the zone Zone3 is “BE (Best Effort)”.

  Further, the allocation control unit 15 includes a plurality of mobile terminals UE in each data frame according to the number of mobile terminals UE belonging to each of the plurality of areas Zone 1 to 3 and the communication quality class of the mobile terminal belonging to each of the plurality of areas Zone 1 to 3 The size of the fields 2 to 4 corresponding to each of the zones 1 to 3 is changed.

For example, the allocation control unit 15 determines the size of the field 3 corresponding to the area Zone1 (occupation ratio with respect to the entire data frame) by the following equation.
(Field size) = (Total sum of weighting coefficients corresponding to communication quality classes of mobile terminals UE belonging to the area corresponding to the field) / (Weighting corresponding to communication quality classes of all mobile terminals UE existing in the cell) Sum of coefficients)

  Therefore, the allocation control unit 15 sets the size of the field 3 (occupation ratio with respect to the entire data frame) to “1/2 = {4 (UGS) +3 (rtPS)} ÷ {4 (UGS) +3 (rtPS) +5 (ErtPS). ) +1 (BE) × 2} ”.

  Similarly, the allocation control unit 15 sets the size of field 2 (occupation ratio with respect to the entire data frame) to “3/7 = {5 (ErtPS) +1 (BE)} ÷ {4 (UGS) +3 (rtPS) +5 ( ErtPS) +1 (BE) × 2} ”.

  Furthermore, the allocation control unit 15 sets the size of field 1 (occupation ratio with respect to the entire data frame) to “1/14 = {1 (BE)} ÷ {4 (UGS) +3 (rtPS) +5 (ErtPS) + 1 + 1 (BE)”. ) × 2} ”.

  Based on this result, the allocation control unit 15 dynamically changes the size of each field in the data frame shown in FIG. 9B.

(Other embodiments)
For example, in the above-described embodiment, an example in which a “base station” is used as a radio communication apparatus having the allocation control unit 15 has been described. Or a higher-level device such as an exchange station.

  In the above-described embodiment, the example in which the cell is divided into three or four has been described. However, the number of the plurality of regions into which the cell is divided is not limited thereto, and may be plural.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Accordingly, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

1 is an overall configuration diagram of a wireless communication system according to a first embodiment of the present invention. It is a functional block diagram of the base station which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the data frame prescribed | regulated by IEEE802.16e. It is a figure which shows an example of the data frame prescribed | regulated by IEEE802.16e. It is a figure for demonstrating the allocation method of the frequency band by the base station which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the data frame used with the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of "Zone Switch IE" in the data frame used with the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating the radio | wireless communications system which concerns on the 3rd Embodiment of this invention. It is a figure for demonstrating the allocation method of the frequency band in the radio | wireless communications system which concerns on a prior art. It is a figure for demonstrating the allocation method of the frequency band in the radio | wireless communications system which concerns on a prior art. It is a figure for demonstrating the allocation method of the frequency band in the radio | wireless communications system which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Antenna 11 ... Reception part 12 ... Frequency conversion part 13 ... OFDM demodulation part 14 ... Primary demodulation part 15 ... Assignment control part 16 ... Modulation part 17 ... Frequency conversion part 18 ... Transmission part 19 ... Antenna

Claims (7)

A wireless communication device arranged in a wireless communication system configured to use a frequency division multiplexing method as a modulation method, realize a frequency division multiple access method, and divide a cell into an inner region and an outer region,
An allocation control unit configured to allocate a usable frequency band in the inner region and the outer region, and to construct a data frame for transmitting a data burst using a subchannel in the allocated frequency band; And
The allocation control unit allocates all frequency bands usable in the cell as frequency bands usable in the inner area, and assigns all frequency bands usable in the cell as frequency bands usable in the outer area. Is configured to allocate a specific frequency band,
The allocation control unit is configured to notify the specific frequency band usable in the outer region by using a bitmap pattern in a field corresponding to the outer region in the data frame. A wireless communication device. The cell is configured to be divided into a plurality of outer regions;
The wireless communication apparatus according to claim 1, wherein the data frame is configured to have a field corresponding to each of the plurality of divided outer regions.   The bitmap pattern is configured by a bit string corresponding to all frequency bands usable in the cell, and is configured to indicate the specific frequency band usable in the outer region by each bit constituting the bit string. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is a wireless communication apparatus. A wireless communication device arranged in a wireless communication system configured to use a frequency division multiplexing method as a modulation method, realize a frequency division multiple access method, and divide a cell into a plurality of regions,
An allocation control unit configured to allocate a usable frequency band in each of the plurality of regions, and to construct a data frame for transmitting a data burst using a subchannel in the allocated frequency band; ,
The allocation control unit is configured to determine which of the plurality of regions the mobile terminal should belong to according to communication quality information received from the mobile terminal existing in the cell;
The wireless communication apparatus, wherein the assignment control unit is configured to assign a usable frequency band in each of the plurality of regions in accordance with the communication quality information. A wireless communication device arranged in a wireless communication system configured to use a frequency division multiplexing method as a modulation method, realize a frequency division multiple access method, and divide a cell into a plurality of regions,
An allocation control unit configured to allocate a usable frequency band in each of the plurality of regions, and to construct a data frame for transmitting a data burst using a subchannel in the allocated frequency band; ,
The allocation control unit is configured to manage a communication quality class of mobile terminals belonging to each of the plurality of regions;
The allocation control unit corresponds to each of the plurality of regions in the data frame according to the number of mobile terminals belonging to each of the plurality of regions and the communication quality class of the mobile terminal belonging to each of the plurality of regions. A wireless communication device configured to change a size of a field to be transmitted. The cell is configured to divide into an inner region and an outer region;
The allocation control unit allocates all frequency bands usable in the cell as frequency bands usable in the inner area, and assigns all frequency bands usable in the cell as frequency bands usable in the outer area. 6. The wireless communication apparatus according to claim 4, wherein the wireless communication apparatus is configured to allocate a specific frequency band. A wireless communication method in a wireless communication system configured to use a frequency division multiplexing method as a modulation method, realize a frequency division multiple access method, and divide a cell into an inner region and an outer region,
The wireless communication apparatus has a step of allocating usable frequency bands in the inner region and the outer region, and constructing a data frame for transmitting a data burst using a subchannel in the allocated frequency band,
In the step, the wireless communication device allocates all frequency bands usable in the cell as frequency bands usable in the inner area, and can be used in the cell as frequency bands usable in the outer area. Assign a specific frequency band of all frequency bands,
In the step, the wireless communication device notifies the specific frequency band usable in the outer region using a bitmap pattern in a field corresponding to the outer region in the data frame. Wireless communication method.

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