JP2008187488A - Base station device and communication method - Google Patents

Base station device and communication method Download PDF

Info

Publication number
JP2008187488A
JP2008187488A JP2007019715A JP2007019715A JP2008187488A JP 2008187488 A JP2008187488 A JP 2008187488A JP 2007019715 A JP2007019715 A JP 2007019715A JP 2007019715 A JP2007019715 A JP 2007019715A JP 2008187488 A JP2008187488 A JP 2008187488A
Authority
JP
Japan
Prior art keywords
communication
terminal
base station
station apparatus
subchannel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2007019715A
Other languages
Japanese (ja)
Inventor
Shinya Ran
真也 蘭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP2007019715A priority Critical patent/JP2008187488A/en
Publication of JP2008187488A publication Critical patent/JP2008187488A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Transceivers (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To achieve AGC processing in an OFDMA/TDMA system. <P>SOLUTION: The RSSI of a communication terminal is calculated (1), and the communication terminals are grouped according to RSSI (2), and sub-channels are assigned to the respective communication terminals for every group (3). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はＯＦＤＭＡ（直交周波数多重接続）／ＴＤＭＡ（時分割多重接続）方式で通信を行う場合のサブチャネルの割り当て技術に関する。   The present invention relates to a subchannel allocation technique in the case of performing communication using OFDMA (Orthogonal Frequency Multiple Access) / TDMA (Time Division Multiple Access).

ＯＦＤＭＡとは、互いに直交関係にある複数のサブキャリアを全通信端末で共有し、任意のサブキャリアの集まりを１つのグループとして位置付け、各通信端末に１つ又は複数のグループを適応的に割り当てることにより多元接続を実現する技術である。本発明の背景となる通信システムでは、上記ＯＦＤＭＡ技術に、時分割多重接続（ＴＤＭＡ）及び時分割複信（ＴＤＤ）技術をさらに組み合わせている。つまり各グループをＴＤＤとして時間軸方向に上り回線と下り回線とに分け、これら上り回線及び下り回線をそれぞれ４つのＴＤＭＡスロットとして分割している（分割された１つの単位をサブチャネルと呼ぶ）。   In OFDMA, a plurality of subcarriers that are orthogonal to each other are shared by all communication terminals, a set of arbitrary subcarriers is positioned as one group, and one or more groups are adaptively assigned to each communication terminal. This is a technology that realizes multiple access. In the communication system as the background of the present invention, the OFDMA technique is further combined with a time division multiple access (TDMA) and time division duplex (TDD) technique. That is, each group is divided into an uplink and a downlink in the time axis direction as TDD, and each of these uplink and downlink is divided into four TDMA slots (one divided unit is called a subchannel).

図５は上記通信システムにおけるサブチャネルの構成（ＭＡＰ）を示しており、縦軸は周波数、横軸は時間を示している。図示のように、この例では周波数軸方向１４個と時間軸方向４個とを掛け合わせた５６個のサブチャネルが上り回線用及び下り回線用にそれぞれ割り当てられる。無線通信を行う基地局装置及び通信端末には、上り回線及び下り回線のそれぞれに属する全てのサブチャネルから任意の１つ又は複数のサブチャネルが割り当てられる（非特許文献１参照）。
庄納崇著「ワイヤレス・ブロードバンド時代を創るＷｉＭＡＸ」株式会社インプレス、２００５年１２月１日、ｐ８１、図４−図８ FIG. 5 shows a subchannel configuration (MAP) in the communication system, where the vertical axis indicates frequency and the horizontal axis indicates time. As shown in the figure, in this example, 56 subchannels obtained by multiplying 14 frequency axis directions and 4 time axis directions are allocated for uplink and downlink, respectively. Arbitrary one or a plurality of subchannels are assigned to all the subchannels belonging to the uplink and the downlink, respectively, to the base station apparatus and the communication terminal that perform wireless communication (see Non-Patent Document 1).
Takashi Shono, “WiMAX Creating the Wireless Broadband Era” Impress, Inc., December 1, 2005, p81, FIGS. 4-8

基地局装置は通信端末からの受信信号をデジタル信号に変換して必要な信号処理を行っているが、デジタル信号に変換する前にＡＧＣ処理を行い、信号レベルをＡＤ変換器のダイナミックレンジに収めている。上記通信システムでは、図５に示すように、各スロット内の１つ又は複数のサブチャネルに通信端末を割り当て、１つのスロットに複数の通信端末を収容している。ＡＧＣ処理はスロット単位で行っているため、スロットが収容する複数の通信端末の信号レベルの差が大きいと、全ての信号レベルをＡＤ変換器のダイナミックレンジに収めることができない場合がある。   The base station apparatus converts the received signal from the communication terminal into a digital signal and performs the necessary signal processing. However, the base station apparatus performs AGC processing before converting it into the digital signal, and stores the signal level within the dynamic range of the AD converter. ing. In the communication system, as shown in FIG. 5, communication terminals are assigned to one or a plurality of subchannels in each slot, and a plurality of communication terminals are accommodated in one slot. Since AGC processing is performed on a slot basis, if there is a large difference in the signal levels of a plurality of communication terminals accommodated in the slot, it may not be possible to fit all signal levels within the dynamic range of the AD converter.

接続処理を例に説明すると、図６に示すように、基地局装置１００が端末Ａと端末Ｂとそれぞれ通信を行っている場合において（図６（１））、２つの端末を収容するスロットが、さらに別の端末Ｃを収容し、端末Ｃから接続要求があった場合を想定し（図６（２））、基地局装置が受信する端末からの信号レベルを、端末Ａ＜端末Ｂ＜端末Ｃと仮定する（図７参照）。   The connection process will be described as an example. As shown in FIG. 6, when the base station apparatus 100 is communicating with each of the terminal A and the terminal B (FIG. 6 (1)), a slot for accommodating two terminals is provided. Further, assuming that another terminal C is accommodated and a connection request is received from the terminal C (FIG. 6 (2)), the signal level from the terminal received by the base station apparatus is expressed as terminal A <terminal B <terminal. Assume C (see FIG. 7).

図７（１）に示すように、端末Ｃの信号レベルがＡＤ変換器のダイナミックレンジより大きいためＡＧＣ処理により端末Ｃの利得を小さくしてＡＤ変換器のダイナミックレンジに収める必要がある。図７（２）はＡＧＣ処理により、各端末の信号レベルを図７（１）に比べ小さくしたものである。しかし、上述のようにＡＧＣ処理はスロット単位で行っているため、ＡＧＣ処理により端末Ｃの利得を小さくすると、同じスロットに収容された他の端末Ａ、Ｂの利得も小さくなる。この結果、端末Ａの信号がノイズに埋もれ、接続を維持することができず端末Ａの接続が遮断されてしまう。一方、ＡＧＣ処理を行わないと、端末Ｃの信号のレベルがＡＤ変換器のダイナミックレンジを超え、信号波形が歪んでしまい接続のための信号処理を実現することができない。   As shown in FIG. 7 (1), since the signal level of the terminal C is larger than the dynamic range of the AD converter, it is necessary to reduce the gain of the terminal C by AGC processing to be within the dynamic range of the AD converter. FIG. 7 (2) shows the signal level of each terminal reduced by AGC processing compared to FIG. 7 (1). However, since the AGC process is performed in slot units as described above, if the gain of terminal C is reduced by the AGC process, the gains of other terminals A and B accommodated in the same slot are also reduced. As a result, the signal of the terminal A is buried in noise, the connection cannot be maintained, and the connection of the terminal A is interrupted. On the other hand, if the AGC processing is not performed, the signal level of the terminal C exceeds the dynamic range of the AD converter, the signal waveform is distorted, and the signal processing for connection cannot be realized.

本発明は、周波数軸方向に分割された互いに直交関係にある複数のサブキャリアの任意のグループを時間軸方向にスロットとして分割したサブチャネルを通信チャネルとして割り当て、通信端末と通信を行う基地局装置において、複数の通信端末に割り当てられた前記サブチャネルを受信する受信手段と、前記サブチャネルに含まれる受信信号の受信信号強度を取得する受信強度取得手段と、前記受信信号強度に応じて前記通信端末をグループ分けするグループ分け手段と、グループ分けされた前記グループ毎に前記タイムスロットを割り当てるタイムスロット割り当て手段とを備える。また、本発明は、周波数軸方向に分割された互いに直交関係にある複数のサブキャリアの任意のグループを時間軸方向にスロットとして分割したサブチャネルを通信チャネルとして割り当て、通信端末と基地局装置が通信を行う通信方法において、複数の通信端末に割り当てられた前記サブチャネルを受信する受信ステップと、前記サブチャネルに含まれる受信信号の受信信号強度を取得する受信強度取得ステップと、前記受信信号強度に応じて前記通信端末をグループ分けするグループ分けステップと、グループ分けされた前記グループ毎に前記タイムスロットを割り当てるタイムスロット割り当てステップとを含む。   The present invention relates to a base station apparatus that performs communication with a communication terminal by allocating as a communication channel a subchannel obtained by dividing an arbitrary group of a plurality of subcarriers divided in the frequency axis direction and orthogonal to each other as a slot in the time axis direction And receiving means for receiving the subchannels assigned to a plurality of communication terminals, receiving strength acquiring means for acquiring the received signal strength of the received signal included in the subchannel, and the communication according to the received signal strength Grouping means for grouping terminals, and time slot assigning means for assigning the time slot to each grouped group. Further, the present invention assigns a subchannel obtained by dividing an arbitrary group of a plurality of subcarriers divided in the frequency axis direction and orthogonal to each other as a slot in the time axis direction as a communication channel, and the communication terminal and the base station apparatus In a communication method for performing communication, a reception step of receiving the subchannel assigned to a plurality of communication terminals, a reception strength acquisition step of acquiring a reception signal strength of a reception signal included in the subchannel, and the reception signal strength A grouping step for grouping the communication terminals according to the time, and a time slot allocation step for allocating the time slot for each grouped group.

タイムスロットを通信端末に割り当てる際に、受信信号強度に応じて通信端末をグループ化しておき、グループ単位でタイムスロットに割り当てることで、スロットが収容する通信端末間の信号レベルの差を小さくすることができる。従って、スロット単位でＡＧＣ処理を行った場合に、スロットが収容する全ての通信端末からの信号のレベルをＡＤ変換器のダイナミックレンジに収めることが可能となる。   When assigning time slots to communication terminals, communication terminals are grouped according to received signal strength, and assigned to time slots in units of groups, thereby reducing the signal level difference between communication terminals accommodated in the slots. Can do. Therefore, when AGC processing is performed in units of slots, the levels of signals from all communication terminals accommodated in the slots can be accommodated in the dynamic range of the AD converter.

本発明において、前記グループ分け手段は、グループ分けした前記通信端末に対し、前記通信端末ごとに必要な帯域に応じた前記サブチャネルを新たに割り当てることが好ましい。また、前記グループ分け手段は、複数の前記通信端末ごとの前記受信信号強度のレベル差が最小になるように順位付けを行うことが好ましい。   In the present invention, it is preferable that the grouping unit newly assigns the subchannel corresponding to a band required for each communication terminal to the grouped communication terminals. Moreover, it is preferable that the said grouping means ranks so that the level difference of the said received signal strength for every said some communication terminal may become the minimum.

図１は本発明の実施形態に係る基地局装置の構成を示す図である。基地局装置１００はプリアンプ部１０１を含む送信ＲＦ部と、選局部１０３及びＡＧＣ部１０５を含む受信ＲＦ部と、送信ＲＦ部及び受信ＲＦ部とアンテナとの接続を切り替える切替部１０７と、受信電力強度（ＲＳＳＩ）を算出するＲＳＳＩ算出部１０９、ＲＳＳＩに応じて通信端末をグループ化するグループ化部１１１、グループ単位で配置するサブチャネルを判定するチャネル配置判定部１１３及び判定結果に基づいてサブチャネルを割り当てたサブチャネルの配列（ＭＡＰ）を作成するＭＡＰ制御部１１５を含む制御部と、ＯＦＤＭＡ処理部１１７と、変復調部１１９とを備える。   FIG. 1 is a diagram showing a configuration of a base station apparatus according to an embodiment of the present invention. The base station apparatus 100 includes a transmission RF unit including a preamplifier unit 101, a reception RF unit including a channel selection unit 103 and an AGC unit 105, a switching unit 107 that switches connection between the transmission RF unit, the reception RF unit, and the antenna, and reception power. RSSI calculation unit 109 that calculates strength (RSSI), grouping unit 111 that groups communication terminals according to RSSI, channel arrangement determination unit 113 that determines subchannels to be arranged in groups, and subchannels based on the determination result Is provided with a control unit including a MAP control unit 115 that creates an array (MAP) of subchannels to which OFDM is assigned, an OFDMA processing unit 117, and a modem unit 119.

基地局装置１００について、図２に基づいて本発明の実施形態を詳細に説明する。基地局装置１００は端末１〜８の８つの端末と通信をしていると仮定する。これら端末は本発明に基づく処理が行われる前は、各スロットにランダムに割り当てられているとする。たとえば、端末１と端末４が第１スロットに、端末２と端末８が第２スロットに割り当てられているような状態である。
各端末から受信した信号は、基地局装置１００のアンテナからアンテナ切替部１０７を経由して選局部１０５に入力される。選局部１０５では各端末ごとに使用チャネルを選ぶのではなく、本発明が適用される通信システム全体に割り当てられている周波数帯域のうち図５に示されるようにチャネル１〜チャネル１４が選ばれる。そして、チャネル１〜１４に存在する各端末の信号がＡＧＣ部１０３に入力される。ＡＧＣ部１０３ではＡＧＣ処理を行う前の選局部１０５から入力された信号の一部をＲＳＳＩ算出部１０９に出力する。ＲＳＳＩ算出部１０９では、図２（１）にあるように端末ごとに基地局装置１００が受信したＲＳＳＩを算出する。
次いで、グループ化部１１１が測定したＲＳＳＩに基づき、図２（２）に示すように通信端末をＲＳＳＩの大きいものから小さいものへ並び替える。具体的には、端末ごとにＲＳＳＩレベルを（図示しない）メモリに記憶し、端末同士で大小判定を行い並び替える。そして、チャネル配置判定部１１３が各端末の必要な周波数帯域（チャネル帯域）を考慮し、ＲＳＳＩの差が比較的小さい端末同士の組み合わせを決定しグループ分けを行う。本実施形態では４つのスロットに８つの通信端末を割り当てるため４グループに分類する。グループ１に端末１と端末５、グループ２に端末２と端末６、グループ３に端末３と端末７、グループ４に端末４と端末８が割り当てられている。
そして、ＭＡＰ制御部１１５は各グループの端末をグループごとに同一スロット内になるように（図２（３））、且つなるべく使用チャネルが隣接しないように各端末ごとに使用スロットと使用チャネルを割り当てて、各端末と基地局装置１００が通信を行うためのＭＡＰ情報（図３）を算出する。なお、ここで述べるチャネルとはＯＦＤＭＡ通信方式におけるサブチャネルである。 The base station apparatus 100 will be described in detail with reference to FIG. It is assumed that base station apparatus 100 is communicating with eight terminals 1 to 8. These terminals are assumed to be randomly assigned to each slot before processing according to the present invention is performed. For example, the terminal 1 and the terminal 4 are assigned to the first slot, and the terminal 2 and the terminal 8 are assigned to the second slot.
A signal received from each terminal is input from the antenna of the base station apparatus 100 to the channel selection unit 105 via the antenna switching unit 107. The channel selection unit 105 does not select the channel to be used for each terminal, but selects channels 1 to 14 as shown in FIG. 5 in the frequency band assigned to the entire communication system to which the present invention is applied. Then, the signal of each terminal existing in channels 1 to 14 is input to AGC section 103. The AGC unit 103 outputs a part of the signal input from the channel selection unit 105 before performing the AGC process to the RSSI calculation unit 109. The RSSI calculation unit 109 calculates the RSSI received by the base station apparatus 100 for each terminal as shown in FIG.
Next, based on the RSSI measured by the grouping unit 111, the communication terminals are rearranged from those having a large RSSI as shown in FIG. Specifically, the RSSI level is stored in a memory (not shown) for each terminal, and the terminals are subjected to size determination and rearranged. And the channel arrangement | positioning determination part 113 considers the required frequency band (channel band) of each terminal, determines the combination of terminals with a comparatively small RSSI difference, and performs grouping. In this embodiment, since 8 communication terminals are allocated to 4 slots, they are classified into 4 groups. Terminal 1 and terminal 5 are assigned to group 1, terminal 2 and terminal 6 are assigned to group 2, terminal 3 and terminal 7 are assigned to group 3, and terminal 4 and terminal 8 are assigned to group 4.
Then, the MAP control unit 115 allocates the slots and channels to be used for each terminal so that the terminals in each group are in the same slot for each group (FIG. 2 (3)) and the channels to be used are not adjacent as much as possible. Then, MAP information (FIG. 3) for communication between each terminal and the base station apparatus 100 is calculated. The channel described here is a subchannel in the OFDMA communication system.

このように割り当てた各通信端末の受信信号レベルをスロットごとに表した図が図４である。図４に示すように各端末をグループ分けし、グループごとに各スロットに割り当てたので各スロットに割り当てられた通信端末の受信信号レベルの差は、本発明の実施前に各スロットにランダムに割り当てられていた（たとえば端末１と端末４が第１スロットに、端末２と端末８が第２スロットに割り当てられていた）状態に比べ小さくなっている。
そして、基地局装置１００は次の送信タイミングで各端末に対し、上記算出された新たなＭＡＰ情報に基づき通信を行う。さらに各端末は次に端末（端末１〜８のうちいずれか）から基地局装置１００に送信されるタイミングにおいて上記ＭＡＰ情報にて送信を行う。そして、上記ＭＡＰ情報に基づいて送信された各端末からの信号はＡＧＣ部１０３にて、各スロットごとにＡＧＣ処理が行われ、ＡＤ変換器の入力ダイナミックレンジに合わせてレベル調整（またはＡＤ変換器への入力オフセット調整）されてＯＦＤＭＡ処理部１１７に入力される。ＯＦＤＭＡ処理部１１７は端末ごとに信号を取り出し、ＦＦＴ処理を行い変復調部１１９で復調をして受信データが出力される。 FIG. 4 shows the received signal level of each communication terminal assigned in this way for each slot. As shown in FIG. 4, since the terminals are grouped and assigned to the slots for each group, the difference in the received signal level of the communication terminals assigned to the slots is randomly assigned to the slots before the implementation of the present invention. Compared to the state in which the terminal 1 and the terminal 4 are assigned to the first slot and the terminal 2 and the terminal 8 are assigned to the second slot, for example.
Then, base station apparatus 100 communicates with each terminal at the next transmission timing based on the calculated new MAP information. Furthermore, each terminal performs transmission with the MAP information at the timing when the terminal (any one of terminals 1 to 8) is next transmitted to base station apparatus 100. A signal transmitted from each terminal based on the MAP information is subjected to AGC processing for each slot by the AGC unit 103, and level adjustment (or AD converter) is performed according to the input dynamic range of the AD converter. The input offset is adjusted to the OFDMA processing unit 117. The OFDMA processing unit 117 extracts a signal for each terminal, performs an FFT process, demodulates the modulation / demodulation unit 119, and outputs received data.

上記実施形態によれば、サブチャネルを通信端末に割り当てる際に、ＲＳＳＩに応じて通信端末をグループ化しておき、グループ単位でサブチャネルに割り当てることで、スロットが収容する通信端末間の信号レベルの差を小さくすることができる。従って、スロット単位でＡＧＣ処理を行った場合に、スロットが収容する全ての通信端末からの信号のレベルをＡＤ変換器のダイナミックレンジに収めることが可能となる。   According to the above embodiment, when assigning subchannels to communication terminals, communication terminals are grouped according to RSSI, and assigned to subchannels in units of groups, so that the signal level between communication terminals accommodated in a slot can be adjusted. The difference can be reduced. Therefore, when AGC processing is performed in units of slots, the levels of signals from all communication terminals accommodated in the slots can be accommodated in the dynamic range of the AD converter.

本発明の実施形態に係る基地局装置の構成を示す図The figure which shows the structure of the base station apparatus which concerns on embodiment of this invention. 制御部の処理の流れを説明するための図The figure for demonstrating the flow of a process of a control part ＭＡＰを示す図Diagram showing MAP 通信端末の信号レベルを示す図The figure which shows the signal level of the communication terminal ＭＡＰを示す図Diagram showing MAP 基地局装置と通信端末の通信形態を示す図The figure which shows the communication form of a base station apparatus and a communication terminal 信号レベルとＡＤ変換器のダイナミックレンジとの関係を示す図The figure which shows the relationship between a signal level and the dynamic range of AD converter

符号の説明Explanation of symbols

１００ 基地局装置
１０１ ＰＡ部
１０３ ＡＧＣ部
１０５ 選局部
１０７ 切替部
１０９ ＲＳＳＩ算出部
１１１ グループ化部
１１３ チャネル配置判定部
１１５ ＭＡＰ制御部
１１７ ＯＦＤＭＡ処理部
１１９ 変復調部 DESCRIPTION OF SYMBOLS 100 Base station apparatus 101 PA part 103 AGC part 105 Channel selection part 107 Switching part 109 RSSI calculation part 111 Grouping part 113 Channel arrangement determination part 115 MAP control part 117 OFDMA processing part 119 Modulation / demodulation part

Claims (4)

周波数軸方向に分割された互いに直交関係にある複数のサブキャリアの任意のグループを時間軸方向にスロットとして分割したサブチャネルを通信チャネルとして割り当て、通信端末と通信を行う基地局装置において、
複数の通信端末に割り当てられた前記サブチャネルを受信する受信手段と、
前記サブチャネルに含まれる受信信号の受信信号強度を取得する受信強度取得手段と、
前記受信信号強度に応じて前記通信端末をグループ分けするグループ分け手段と、
グループ分けされた前記グループ毎に前記タイムスロットを割り当てるタイムスロット割り当て手段と、
を備えることを特徴とする基地局装置。 In a base station apparatus that performs communication with a communication terminal by assigning a subchannel obtained by dividing an arbitrary group of a plurality of subcarriers that are orthogonal to each other divided in the frequency axis direction as a slot in the time axis direction,
Receiving means for receiving the subchannel assigned to a plurality of communication terminals;
A reception strength acquisition means for acquiring a reception signal strength of a reception signal included in the subchannel;
Grouping means for grouping the communication terminals according to the received signal strength;
Time slot assigning means for assigning the time slot to each of the grouped groups;
A base station apparatus comprising: 前記グループ分け手段は、グループ分けした前記通信端末に対し、
前記通信端末ごとに必要な帯域に応じた前記サブチャネルを新たに割り当てることを特徴とする請求項１に記載の基地局装置。 The grouping means is configured to group the communication terminals.
The base station apparatus according to claim 1, wherein the subchannel is newly allocated according to a necessary band for each communication terminal. 前記グループ分け手段は、複数の前記通信端末ごとの前記受信信号強度のレベル差が最小になるように順位付けを行うことを特徴とする請求項１または２に記載の基地局装置。   The base station apparatus according to claim 1, wherein the grouping unit performs ranking so that a difference in level of the received signal strength for each of the plurality of communication terminals is minimized. 周波数軸方向に分割された互いに直交関係にある複数のサブキャリアの任意のグループを時間軸方向にスロットとして分割したサブチャネルを通信チャネルとして割り当て、通信端末と基地局装置が通信を行う通信方法において、
複数の通信端末に割り当てられた前記サブチャネルを受信する受信ステップと、
前記サブチャネルに含まれる受信信号の受信信号強度を取得する受信強度取得ステップと、
前記受信信号強度に応じて前記通信端末をグループ分けするグループ分けステップと、
グループ分けされた前記グループ毎に前記タイムスロットを割り当てるタイムスロット割り当てステップと、
を含むことを特徴とする通信方法。 In a communication method in which a subchannel obtained by dividing an arbitrary group of a plurality of subcarriers divided in the frequency axis direction and orthogonal to each other as a slot in a time axis direction is assigned as a communication channel, and a communication terminal and a base station apparatus communicate with each other ,
Receiving the subchannels assigned to a plurality of communication terminals; and
A reception strength acquisition step of acquiring a reception signal strength of a reception signal included in the subchannel;
A grouping step of grouping the communication terminals according to the received signal strength;
A time slot assigning step for assigning the time slot to each of the grouped groups;
A communication method comprising:
JP2007019715A 2007-01-30 2007-01-30 Base station device and communication method Pending JP2008187488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007019715A JP2008187488A (en) 2007-01-30 2007-01-30 Base station device and communication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007019715A JP2008187488A (en) 2007-01-30 2007-01-30 Base station device and communication method

Publications (1)

Publication Number Publication Date
JP2008187488A true JP2008187488A (en) 2008-08-14

Family

ID=39730229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007019715A Pending JP2008187488A (en) 2007-01-30 2007-01-30 Base station device and communication method

Country Status (1)

Country Link
JP (1) JP2008187488A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010141660A (en) * 2008-12-12 2010-06-24 Toshiba Corp Wireless communication device, wireless base station, wireless terminal station, and wireless communication method
JP2010226696A (en) * 2009-02-25 2010-10-07 Kyocera Corp Communication apparatus and received power measuring method
JP2010278685A (en) * 2009-05-27 2010-12-09 Kyocera Corp Base station device and method of assigning channel
WO2012153520A1 (en) * 2011-05-09 2012-11-15 京セラ株式会社 Base station and wireless resource allocation method
WO2015092416A3 (en) * 2013-12-20 2015-09-03 Cambium Networks Ltd Apparatus and method for reducing interference in a wireless communication system
WO2018016060A1 (en) * 2016-07-22 2018-01-25 株式会社日立国際電気 Wireless communication apparatus and wireless communication system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006011471A1 (en) * 2004-07-30 2006-02-02 Matsushita Electric Industrial Co., Ltd. Base station device and wireless communication method
WO2006043588A1 (en) * 2004-10-19 2006-04-27 Sharp Kabushiki Kaisha Base station device, wireless communication system, and wireless transmission method
JP2008060743A (en) * 2006-08-29 2008-03-13 Sanyo Electric Co Ltd Communication method and wireless device using it

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006011471A1 (en) * 2004-07-30 2006-02-02 Matsushita Electric Industrial Co., Ltd. Base station device and wireless communication method
WO2006043588A1 (en) * 2004-10-19 2006-04-27 Sharp Kabushiki Kaisha Base station device, wireless communication system, and wireless transmission method
JP2008060743A (en) * 2006-08-29 2008-03-13 Sanyo Electric Co Ltd Communication method and wireless device using it

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010141660A (en) * 2008-12-12 2010-06-24 Toshiba Corp Wireless communication device, wireless base station, wireless terminal station, and wireless communication method
JP2010226696A (en) * 2009-02-25 2010-10-07 Kyocera Corp Communication apparatus and received power measuring method
JP2010278685A (en) * 2009-05-27 2010-12-09 Kyocera Corp Base station device and method of assigning channel
WO2012153520A1 (en) * 2011-05-09 2012-11-15 京セラ株式会社 Base station and wireless resource allocation method
JP2012235410A (en) * 2011-05-09 2012-11-29 Kyocera Corp Base station and wireless resource allocation method
WO2015092416A3 (en) * 2013-12-20 2015-09-03 Cambium Networks Ltd Apparatus and method for reducing interference in a wireless communication system
GB2523848A (en) * 2013-12-20 2015-09-09 Cambium Networks Ltd Apparatus and method for reducing interference in a wireless communication system
GB2523848B (en) * 2013-12-20 2016-07-27 Cambium Networks Ltd Apparatus and method for reducing interference in a wireless communication system
US9750034B2 (en) 2013-12-20 2017-08-29 Cambium Networks Limited Apparatus and method for reducing interference in a wireless communication system
WO2018016060A1 (en) * 2016-07-22 2018-01-25 株式会社日立国際電気 Wireless communication apparatus and wireless communication system
JP6498846B2 (en) * 2016-07-22 2019-04-10 株式会社日立国際電気 Wireless communication apparatus and wireless communication system

Similar Documents

Publication Publication Date Title
KR100966507B1 (en) Apparatus, method and computer program product providing common pilot channel for soft frequency reuse
RU2643643C1 (en) Systems and methods for ofdm with flexible intervals of substructing and duration of symbol
US7912135B2 (en) Method and transmission apparatus for allocating resources to transmit uplink packet data in an orthogonal frequency division multiplexing system
US8134967B2 (en) Method and apparatus for use in wireless communications
JP5088506B2 (en) Physical resource management method and physical resource management apparatus in broadband communication system
US20070237248A1 (en) Apparatus and method for allocating resources and performing communication in a wireless communication system
KR20100102712A (en) Ofdma frame structures for uplinks in mimo networks
US20100074347A1 (en) Method and apparatus of subchannelization of wireless communication system
CN102017461A (en) Efficient and consistent wireless downlink channel configuration
JP2008172541A (en) Base station device, communication terminal device, communicating system, and communication method
US10602531B2 (en) Communication system, communication method, and base station
WO2019153195A1 (en) Methods and apparatuses for phase tracking reference signal configuration
JP2008072275A (en) Mobile communication system, base station apparatus, mobile station apparatus, and multi-carrier communication method
CN108809597B (en) Method for determining cyclic shift amount of preamble sequence and method and device for configuring set thereof
JP2008187488A (en) Base station device and communication method
EP3926908A1 (en) Transmitting device, receiving device, transmitting method and receiving method
JPWO2007138664A1 (en) Scheduling method and communication apparatus
KR101235670B1 (en) Method for allocating frequency subchannels on an air interface of a wireless communication system and corresponding radio resource allocation module
KR101974016B1 (en) Data transmitting method using ofdm and noma
JP6256024B2 (en) Radio base station and radio base station transmission power control method
US8953536B2 (en) Method and a user equipment for transmitting a signal, and a method and a base station for receiving a signal
KR101460920B1 (en) Ranging channel structures and methods
US20150131482A1 (en) Method for transmitting discovery signal in device-to-device communication
KR20100004034A (en) Apparatus and method for subchanneling in wireless communication system
WO2011074385A1 (en) Mobile communication system, base station, mobile station, and wireless communication method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20091215

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110622

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110628

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20111129