JP2006033654A - Radio communication control method and radio terminal device - Google Patents

Radio communication control method and radio terminal device Download PDF

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JP2006033654A
JP2006033654A JP2004212456A JP2004212456A JP2006033654A JP 2006033654 A JP2006033654 A JP 2006033654A JP 2004212456 A JP2004212456 A JP 2004212456A JP 2004212456 A JP2004212456 A JP 2004212456A JP 2006033654 A JP2006033654 A JP 2006033654A
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wireless
access point
communication
communication speed
wireless terminal
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Ryoji Tanaka
亮二 田中
Wataru Yazaki
渉 矢▲崎▼
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Hitachi Ltd
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To enhance security of radio communication by minimizing a range wherein a radio wave reaches, so that wire tapping of radio waves by another person becomes difficult when performing the radio communication between a radio terminal and a radio access point. <P>SOLUTION: There is provided a means for minimizing a radio wave reachable effective range within a range wherein a communication velocity is not decelerated, by reducing a radio transmission output gradually from a specified value while measuring the communication velocity when performing radio communication between a radio terminal and a radio access point. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は無線データ通信におけるセキュリティを強化する方法及びその装置に関するものである。   The present invention relates to a method and apparatus for enhancing security in wireless data communication.

無線ＬＡＮ等、無線データ通信分野におけるセキュリティ対策としては、データを暗号化する方法や無線ＬＡＮのＭＡＣ認証等により実現している。特開２００２−１２４９６０号ではデータを送信する場合は暗号化した情報を送信することでセキュリティを向上させる方法を示しており、特開２００３−５１８２５号では無線ＬＡＮ端末のＭＡＣアドレスを元に機器認証を行なうことによりセキュリティを高めている。   Security measures in the field of wireless data communication such as wireless LAN are realized by a data encryption method, wireless LAN MAC authentication, or the like. Japanese Patent Application Laid-Open No. 2002-124960 shows a method for improving security by transmitting encrypted information when transmitting data, and Japanese Patent Application Laid-Open No. 2003-51825 discloses device authentication based on the MAC address of a wireless LAN terminal. To increase security.

特開２００２−１２４９６０号公報JP 2002-124960 A 特開２００３−５１８２５号公報JP 2003-51825 A

無線ＬＡＮ等における無線通信時、無線端末が設置されている事務所外まで無線電波が届く場合、他者が通信を傍受し、通信データを解析、復号化する等、不正アクセスの危険があった。本発明は無線端末と無線アクセスポイントで無線通信を行なう際、電波の届く範囲を最小化し、他者が電波を傍受しにくくすることにより、無線通信のセキュリティを強化することを目的とする。   During wireless communication in a wireless LAN, etc., if wireless radio waves reach outside the office where the wireless terminal is installed, there was a risk of unauthorized access, such as another person intercepting the communication and analyzing and decrypting the communication data. . An object of the present invention is to enhance the security of wireless communication by minimizing the reach of radio waves and making it difficult for others to intercept radio waves when performing radio communication with a radio terminal and a radio access point.

上記目的を達成するために、無線端末と無線アクセスポイント間で無線通信時、通信速度を測定しながら無線送信出力を規定値から徐々に下げていき、通信速度が低下しない範囲において無線電波到達有効範囲を最小化する手段を提供する。ここで、通信速度とは、感度低下に伴なう訂正処理などの時間を含むデータの伝送速度である。   In order to achieve the above-mentioned purpose, when wireless communication is performed between a wireless terminal and a wireless access point, the wireless transmission output is gradually reduced from the specified value while measuring the communication speed, and the radio wave arrival is effective within the range where the communication speed does not decrease. Provides a means to minimize the range. Here, the communication speed is a data transmission speed including a time for correction processing or the like accompanying a decrease in sensitivity.

本発明により無線端末と無線アクセスポイントの通信の際、電波到達範囲が最低値になり、無線端末が設定されている事務所外に洩れる電波が必要最小限に抑えられるため、他者が電波を傍受する危険性を最小化し、セキュリティを高めることができる。   According to the present invention, when a wireless terminal and a wireless access point communicate with each other, the radio wave reachable range becomes the minimum value, and radio waves leaking outside the office where the wireless terminal is set can be minimized. The risk of eavesdropping can be minimized and security can be increased.

以下、本発明を実施するための最良の形態を図面に基づいて詳細に説明する。   The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

図１は、本発明の一実施例として、情報の発信源である無線アクセスポイント１と情報の受け手である無線端末２の電波有効到達範囲を、規定送信出力時と送信出力制御後の最低送信出力時とで比較したものである。規定送信出力時は無線アクセスポイント１の電波有効到達範囲４、無線端末２の電波有効到達範囲５となり、他者無線端末３が電波傍受可能である。無線アクセスポイント１と無線端末２が無線送信出力を下げた後の最低送信出力時は、無線アクセスポイント１の電波有効到達範囲６、無線端末２の電波有効到達範囲７となり、他者無線端末３は電波傍受圏外となる。   FIG. 1 shows, as an embodiment of the present invention, the radio wave effective reach range of a wireless access point 1 that is a source of information and a wireless terminal 2 that is a receiver of information. It is a comparison at the time of output. At the time of the prescribed transmission output, the radio wave effective range 4 of the wireless access point 1 and the radio wave effective range 5 of the wireless terminal 2 are obtained, and the other person's wireless terminal 3 can intercept the radio wave. At the time of the lowest transmission output after the wireless access point 1 and the wireless terminal 2 have lowered the wireless transmission output, the radio access point 1 has the radio wave effective reach range 6 and the radio terminal 2 has the radio wave effective reach range 7. Is out of the radio coverage area.

図２は本実施例における無線端末と無線アクセスポイントのブロック図である。無線端末８は高周波回路９と変復調回路１０とデータ処理回路１１を有している。高周波回路９は無線送信出力を制御する送信電力制御部１２を有し、データ処理回路１１は通信速度測定部１３を有する。無線アクセスポイント１４は高周波回路１５と変復調回路１６とデータ処理回路１７を有している。高周波回路１５は無線送信出力を制御する送信電力制御部１８を有し、データ処理回路１７は通信速度測定部１９を有する。   FIG. 2 is a block diagram of the wireless terminal and the wireless access point in the present embodiment. The wireless terminal 8 includes a high frequency circuit 9, a modem circuit 10, and a data processing circuit 11. The high-frequency circuit 9 includes a transmission power control unit 12 that controls the wireless transmission output, and the data processing circuit 11 includes a communication speed measurement unit 13. The wireless access point 14 includes a high frequency circuit 15, a modem circuit 16, and a data processing circuit 17. The high frequency circuit 15 includes a transmission power control unit 18 that controls the wireless transmission output, and the data processing circuit 17 includes a communication speed measurement unit 19.

図３は無線端末側を最低送信出力にする動作を無線端末側と無線アクセスポイント側とでタイムチャートにしたものであり、図４は無線アクセスポイント側を最低送信出力に設定する動作を無線端末側と無線アクセスポイント側とでタイムチャートにしたものである。   FIG. 3 is a time chart showing the operation of setting the wireless terminal side to the lowest transmission output on the wireless terminal side and the wireless access point side. FIG. 4 shows the operation of setting the wireless access point side to the minimum transmission output. This is a time chart on the side and the wireless access point side.

図５は無線端末８及び無線アクセスポイント１４が通信する際の送信電力と通信速度の関係をグラフにしたものである。   FIG. 5 is a graph showing the relationship between transmission power and communication speed when the wireless terminal 8 and the wireless access point 14 communicate.

以下、図３に従い無線端末側を最低送信出力に設定する動作を説明する。無線端末側で電源を入れる（ステップ２０）と送信電力制御部１２が無線端末送信電力を規定値に設定し（ステップ２１）、ダミーデータを作成後（ステップ２２）、ダミーデータを送信する（ステップ２３）。尚、ダミーデータの送信前に送受信におけるコネクションを確立しているものとする。無線アクセスポイント１４の高周波回路１５でダミーデータを受信し（ステップ２４）、変復調回路１６でダミーデータを復調した後（ステップ２５）、通信速度測定部１９でダミーデータの通信速度を測定し（ステップ２６）、通信速度の測定データを無線端末側に送信する（ステップ２７）。   The operation for setting the wireless terminal side to the lowest transmission output will be described below with reference to FIG. When power is turned on at the wireless terminal side (step 20), the transmission power control unit 12 sets the wireless terminal transmission power to a specified value (step 21), creates dummy data (step 22), and transmits dummy data (step) 23). It is assumed that a connection for transmission / reception is established before transmission of dummy data. The dummy data is received by the high frequency circuit 15 of the wireless access point 14 (step 24), the dummy data is demodulated by the modem circuit 16 (step 25), and the communication speed of the dummy data is measured by the communication speed measuring unit 19 (step 25). 26) The communication speed measurement data is transmitted to the wireless terminal side (step 27).

無線端末側では、通信速度データの受信後（ステップ２８）、送信電力を１ポイント（所定の値）下げ（ステップ２９）、ダミーデータを作成し（ステップ３０）、再度ダミーデータを送信する（ステップ３１）。ここでの１ポイントは送信電力規定値を複数等分に分割した電力値を指す。無線アクセスポイント１４側でダミーデータを受信（ステップ３２）及び復調（ステップ３３）した後、ダミーデータの通信速度を測定し（ステップ３４）、通信速度の測定データを無線端末側に送信する（ステップ３５）。   On the wireless terminal side, after receiving the communication speed data (step 28), the transmission power is reduced by 1 point (predetermined value) (step 29), dummy data is created (step 30), and the dummy data is transmitted again (step 30). 31). One point here indicates a power value obtained by dividing the prescribed transmission power value into a plurality of equal parts. After receiving the dummy data on the wireless access point 14 side (step 32) and demodulating (step 33), the communication speed of the dummy data is measured (step 34), and the measurement data of the communication speed is transmitted to the wireless terminal side (step). 35).

無線端末側で通信速度データを受信した後（ステップ３６）、データ処理回路１１にて前回の測定データ（ステップ２８における測定データ）と比較し、通信速度が低下したかどうかを判定する（ステップ３７）。通信速度が低下しない場合、再度送信電力を１ポイント下げ（ステップ２９）、ダミーデータを作成し（ステップ３０）、ダミーデータを送信する（ステップ３１）。以降は、ステップ３２〜ステップ３６と続き、ステップ３７で１回前の通信速度測定データと比較判定し、通信速度が下がらない場合はステップ２９〜ステップ３７の動作を繰り返す。ステップ３７で通信速度が１回前の測定値より低下した場合、無線端末８は送信電力を１ポイント上げ（ステップ３８）、送信電力の決定値として保持し（ステップ３９）、送信電力が決定したことを無線アクセスポイント１４に通知する。   After the communication speed data is received on the wireless terminal side (step 36), the data processing circuit 11 compares it with the previous measurement data (measurement data in step 28) to determine whether the communication speed has decreased (step 37). ). If the communication speed does not decrease, the transmission power is reduced by one point again (step 29), dummy data is created (step 30), and the dummy data is transmitted (step 31). Thereafter, the process continues from step 32 to step 36, and is compared with the previous communication speed measurement data at step 37. If the communication speed does not decrease, the operations of step 29 to step 37 are repeated. When the communication speed is lower than the previous measurement value in step 37, the wireless terminal 8 increases the transmission power by one point (step 38) and holds it as a determined value of the transmission power (step 39), and the transmission power is determined. This is notified to the wireless access point 14.

次に、図４に従い、無線アクセスポイント側を最低送信出力に設定する動作を説明する。図３のステップ４１で無線端末８から送信電力決定の通知を受信後、データ処理回路１７でダミーデータを作成した後（ステップ４２）、ダミーデータを送信する（ステップ４３）。無線端末８の高周波回路９でダミーデータを受信し（ステップ４４）、変復調回路１０でダミーデータの復調後（ステップ４５）、通信速度測定部１３でダミーデータの通信速度を測定し（ステップ４６）、通信速度測定データを無線アクセスポイント側に送信する（ステップ４７）。無線アクセスポイント１４側では通信速度データの受信後（ステップ４８）、送信電力を１ポイント下げ（ステップ４９）、ダミーデータを作成し（ステップ５０）、再度ダミーデータを送信する（ステップ５１）。   Next, an operation for setting the wireless access point side to the lowest transmission output will be described with reference to FIG. After receiving the notification of transmission power determination from the wireless terminal 8 at step 41 in FIG. 3, after the dummy data is created by the data processing circuit 17 (step 42), the dummy data is transmitted (step 43). The dummy data is received by the high frequency circuit 9 of the wireless terminal 8 (step 44), after demodulating the dummy data by the modem circuit 10 (step 45), the communication speed measuring unit 13 measures the communication speed of the dummy data (step 46). The communication speed measurement data is transmitted to the wireless access point side (step 47). On the wireless access point 14 side, after receiving the communication speed data (step 48), the transmission power is reduced by 1 point (step 49), dummy data is created (step 50), and the dummy data is transmitted again (step 51).

無線端末側でダミーデータを受信（ステップ５２）及び復調（ステップ５３）した後、ダミーデータの通信速度を測定し（ステップ５４）、通信速度測定データを無線アクセスポイント側に送信する（ステップ５５）。無線アクセスポイント側で通信速度データを受信後（ステップ５６）、データ処理回路１７にて前回の測定データ（ステップ４８における測定データ）と比較し、通信速度が低下したかどうかを判定する（ステップ５７）。通信速度が低下しない場合、再度送信電力を１ポイント下げ（ステップ４９）、ダミーデータを作成し（ステップ５０）、ダミーデータを送信する（ステップ５１）。   After receiving the dummy data on the wireless terminal side (step 52) and demodulating (step 53), the communication speed of the dummy data is measured (step 54), and the communication speed measurement data is transmitted to the wireless access point side (step 55). . After receiving the communication speed data on the wireless access point side (step 56), the data processing circuit 17 compares it with the previous measurement data (measurement data in step 48) to determine whether the communication speed has decreased (step 57). ). If the communication speed does not decrease, the transmission power is reduced by one point again (step 49), dummy data is created (step 50), and the dummy data is transmitted (step 51).

以降は、ステップ５２〜ステップ５６と続き、ステップ５７で１回前の通信速度測定データと比較判定し、通信速度が下がらない場合はステップ４９〜ステップ５７の動作を繰り返す。ステップ５７で通信速度が１回前の測定値より低下した場合、無線アクセスポイント１４は送信電力を１ポイント上げ（ステップ５８）、送信電力の決定値として保持し（ステップ５９）、無線端末側に実データ送信の許可を通知する（ステップ６０）。   Thereafter, the process continues from step 52 to step 56, and is compared with the previous communication speed measurement data at step 57. If the communication speed does not decrease, the operations of step 49 to step 57 are repeated. When the communication speed is lower than the previous measurement value in step 57, the wireless access point 14 increases the transmission power by one point (step 58) and holds it as a determined value of the transmission power (step 59). The permission of actual data transmission is notified (step 60).

無線端末側で送信許可通知を受信後（ステップ６１）、無線端末８と無線アクセスポイント１４間で実データ送信を開始する（ステップ６２）。   After receiving the transmission permission notification on the wireless terminal side (step 61), actual data transmission is started between the wireless terminal 8 and the wireless access point 14 (step 62).

次に、無線端末及び無線アクセスポイントの送信電力と通信速度の動作関係を図５により説明する。電源ＯＮの直後の規定送信電力６０における通信速度は規定通信速度６１であるが、送信電力を1ポイントづつ低下させていくと送信電力６２の位置でビットエラー等の発生による誤り訂正処理等により通信速度が低下する（図５の６３の位置）。従って、送信電力を1ポイント増加させることにより規定通信速度に戻る（図５の６４の位置）。   Next, the operation relationship between the transmission power and the communication speed of the wireless terminal and the wireless access point will be described with reference to FIG. The communication speed at the specified transmission power 60 immediately after the power is turned on is the specified communication speed 61. However, when the transmission power is decreased by one point, communication is performed at the position of the transmission power 62 by error correction processing due to the occurrence of a bit error or the like. The speed decreases (position 63 in FIG. 5). Therefore, the transmission power is increased by 1 point to return to the specified communication speed (position 64 in FIG. 5).

本実施例により、無線端末８と無線アクセスポイント１４間の通信は通信速度が低下しない範囲において無線電波到達有効範囲を最小化することが出来、無線端末が設置されている事務所外に洩れる電波が最小限に抑えられるため、他者が電波を傍受する危険性を最小化し、セキュリティを高めることができる。尚、送信電力の決定値は電源が入っている期間保持されるものとし、機器の移動等の場合は、電源を入れ直すことにより上記動作が再度実行され、新しい位置で最小有効到達範囲を得ることが出来る。また、本実施例では電源ＯＮで動作開始するようにしているが、無線端末に送信出力の自動設定釦を設け、無線端末移動時に送信出力の自動設定釦を押すことにより本動作が実行されるようにしても良い。   According to the present embodiment, the communication between the wireless terminal 8 and the wireless access point 14 can minimize the wireless radio wave reachable range within a range where the communication speed does not decrease, and the radio wave leaking outside the office where the wireless terminal is installed. Therefore, it is possible to minimize the danger of others to intercept radio waves and increase security. In addition, the determined value of transmission power shall be maintained while the power is on. In the case of equipment movement, etc., the above operation is performed again by turning the power on again to obtain the minimum effective reach at the new position. I can do it. In this embodiment, the operation is started when the power is turned on. However, an automatic setting button for transmission output is provided on the wireless terminal, and this operation is executed by pressing the automatic setting button for transmission output when the wireless terminal moves. You may do it.

上記の実施例では、無線アクセスポイント及び無線端末がそれぞれ１つづつの場合を説明したが、無線アクセスポイントと通信を行う無線端末が複数あり、無線アクセスポイントが時分割で複数の無線端末と通信を行う場合、無線アクセスポイントは、送信電力制御部１８において、それぞれの時間帯で、それぞれの無線端末に応じて送信出力を可変するとともに、それぞれの無線端末は、それぞれの無線電波到達有効範囲に応じて送信出力を可変する。その結果、無線アクセスポイント及び無線端末のいずれからも出力される送信データのセキュリテイを高めることができる。   In the above embodiment, the case where there is one wireless access point and one wireless terminal is described. However, there are a plurality of wireless terminals that communicate with the wireless access point, and the wireless access point communicates with a plurality of wireless terminals in a time division manner. When performing, the wireless access point varies the transmission output in accordance with each wireless terminal in each time zone in the transmission power control unit 18, and each wireless terminal responds to each wireless radio wave arrival effective range. To change the transmission output. As a result, it is possible to increase the security of transmission data output from both the wireless access point and the wireless terminal.

あるいは、無線アクセスポイントの送信出力は一定に設定し、それぞれの無線端末のみが、それぞれの無線電波到達有効範囲に応じて送信出力を可変にする。その結果、少なくとも、無線端末から出力される送信データのセキュリテイを高めることができる。   Alternatively, the transmission output of the wireless access point is set constant, and only each wireless terminal makes the transmission output variable according to each wireless radio wave reachable range. As a result, at least the security of transmission data output from the wireless terminal can be increased.

図３および図４に示す送信電力の設定動作において、送信電力を１ポイント下げる際に、通信速度が所定のレベル以下になったら１ポイントに相当する電力変化の値を小さなものに設定し直すことにより、無線電波到達有効範囲をきめ細かに設定できる。   In the transmission power setting operation shown in FIG. 3 and FIG. 4, when the transmission power is lowered by one point, if the communication speed falls below a predetermined level, the power change value corresponding to one point is reset to a smaller value. Thus, the radio wave reachable range can be set finely.

無線アクセスポイントが固定した場所に設定され、無線端末の位置が通信中に移動する場合、無線アクセスポイントの無線電波到達有効範囲外に無線端末が移動して通信が中断することが考えられる。その場合、規定の送信出力に設定してから通信を再開した後、図３及び図４に示す送信電力の設定動作を行う。   When the wireless access point is set at a fixed location and the position of the wireless terminal moves during communication, the wireless terminal may move outside the effective radio wave reachable range of the wireless access point and communication may be interrupted. In that case, after the communication is resumed after setting to the prescribed transmission output, the transmission power setting operation shown in FIGS. 3 and 4 is performed.

無線端末の位置が通信中に移動するに連れて、この無線端末と通信する無線アクセスポイントが別の固定した位置にあるものに変わる場合、新たな無線アクセスポイントの無線電波到達有効範囲外に無線端末が移動して通信が中断することが考えられる。その場合、規定の送信出力に設定してから通信を再開した後、図３及び図４に示す送信電力の設定動作を行う。   As the location of the wireless terminal moves during communication, if the wireless access point that communicates with this wireless terminal changes to one at a different fixed location, the wireless terminal is wirelessly outside the effective radio wave reachable range of the new wireless access point. The terminal may move and communication may be interrupted. In that case, after the communication is resumed after setting to the prescribed transmission output, the transmission power setting operation shown in FIGS. 3 and 4 is performed.

上記のように、無線端末の位置の移動に伴なって通信が中断することを防止するために、図３及び図４に示す送信電力の設定動作を、通信中の予め設定した周期であって無通話状態の時に行う、あるいは、利用者の指示に基づいて適宜行う。その結果、無線端末の位置が移動していても、通信を中断せずに、送信データのセキュリテイを高めることができる。   As described above, in order to prevent communication from being interrupted due to movement of the position of the wireless terminal, the transmission power setting operation shown in FIG. 3 and FIG. This is performed when there is no call, or based on the user's instruction. As a result, even if the position of the wireless terminal is moving, it is possible to improve the security of transmission data without interrupting communication.

無線アクセスポイントと無線端末の電波有効到達範囲を規定送信出力時と送信出力制御後の最低送信出力時とで比較した図である。It is the figure which compared the radio wave effective reach of a wireless access point and a radio | wireless terminal at the time of regulation transmission output and the minimum transmission output after transmission output control. 無線端末と無線アクセスポイントのブロック図である。It is a block diagram of a wireless terminal and a wireless access point. 無線端末側を最低送信出力にする動作を示すフローチャートである。It is a flowchart which shows the operation | movement which makes the wireless terminal side the minimum transmission output. 無線アクセスポイント側を最低送信出力にする動作を示すフローチャートである。It is a flowchart which shows the operation | movement which makes the wireless access point side the minimum transmission output. 無線端末及び無線アクセスポイントが通信する際の送信電力と通信速度の関係を示すグラフである。It is a graph which shows the relationship between the transmission power and communication speed at the time of a wireless terminal and a wireless access point communicating.

符号の説明Explanation of symbols

１ 無線アクセスポイント
２ 無線端末
３ 他者無線端末
４ 規定送信出力時の無線アクセスポイントの有効到達範囲
５ 規定送信出力時の無線端末の有効到達範囲
６ 最低送信出力時の無線アクセスポイントの有効到達範囲
７ 最低送信出力時の無線端末の有効到達範囲
８ 無線端末
９ 無線端末の高周波回路
１０ 無線端末の変復調回路
１１ 無線端末のデータ処理回路
１２ 無線端末の送信電力制御部
１３ 無線端末の通信速度測定部
１４ 無線アクセスポイント
１５ 無線アクセスポイントの高周波回路
１６ 無線アクセスポイントの変復調回路
１７ 無線アクセスポイントのデータ処理回路
１８ 無線アクセスポイントの送信電力制御部
１９ 無線アクセスポイントの通信速度測定部
DESCRIPTION OF SYMBOLS 1 Wireless access point 2 Wireless terminal 3 Other party wireless terminal 4 Effective reachable range of wireless access point at specified transmission output 5 Effective reachable range of wireless terminal at specified transmission output 6 Effective reachable range of wireless access point at minimum transmission output 7 Effective range of wireless terminal at minimum transmission output 8 Wireless terminal 9 High frequency circuit 10 of wireless terminal Modulation / demodulation circuit 11 of wireless terminal Data processing circuit 12 of wireless terminal Transmission power control unit 13 of wireless terminal Communication speed measurement unit of wireless terminal 14 Wireless Access Point 15 Wireless Access Point High Frequency Circuit 16 Wireless Access Point Modulation / Demodulation Circuit 17 Wireless Access Point Data Processing Circuit 18 Wireless Access Point Transmission Power Control Unit 19 Wireless Access Point Communication Speed Measurement Unit

Claims (5)

無線アクセスポイントとの間で無線通信を行う無線端末の無線通信制御方法は、前記無線アクセスポイントとの間で信号を送受信する際に、通信速度を測定しながら無線送信出力を規定値から徐々に下げていき、前記通信速度が低下しない値に前記無線送信出力を設定することを特徴とする無線通信制御方法。   A wireless communication control method of a wireless terminal that performs wireless communication with a wireless access point is configured to gradually increase a wireless transmission output from a specified value while measuring a communication speed when transmitting and receiving a signal to and from the wireless access point. A wireless communication control method, wherein the wireless transmission output is set to a value that decreases and the communication speed does not decrease. 無線アクセスポイントとの間で無線通信を行う無線端末装置は、前記無線アクセスポイントとの間で信号を送受信する際に、通信速度を測定しながら無線送信出力を規定値から徐々に下げる手段と、前記通信速度が低下しない値に前記無線送信出力を設定する手段を有することを特徴とする無線端末装置。   A wireless terminal device that performs wireless communication with a wireless access point, when transmitting and receiving signals to and from the wireless access point, means for gradually decreasing the wireless transmission output from a specified value while measuring the communication speed; A wireless terminal apparatus comprising: means for setting the wireless transmission output to a value at which the communication speed does not decrease. 無線アクセスポイントとの間で無線通信を行う無線端末の無線通信制御方法は、前記無線アクセスポイントとの間で信号を送受信する際に、前記無線アクセスポイントに送信したダミーデータに対する通信速度を前記無線アクセスポイントから受け取り、前記受け取った通信速度が前よりも低下していなければ、無線送信出力を所定の値だけ減算した値に設定し、前記受け取った通信速度が前よりも低下していれば、前記無線送信出力を前記所定の値だけ加算した値に設定することを特徴とする無線通信制御方法。   A wireless communication control method of a wireless terminal that performs wireless communication with a wireless access point is configured to set a communication speed for dummy data transmitted to the wireless access point when transmitting / receiving a signal to / from the wireless access point. If it is received from an access point and the received communication speed is not lower than before, the wireless transmission output is set to a value obtained by subtracting a predetermined value, and if the received communication speed is lower than before, A wireless communication control method, wherein the wireless transmission output is set to a value obtained by adding the predetermined value. 無線端末との間で無線通信を行う無線アクセスポイントの無線通信制御方法は、前記無線端末との間で信号を送受信する際に、通信速度を測定しながら無線送信出力を規定値から徐々に下げていき、前記通信速度が低下しない値に前記無線送信出力を設定することを特徴とする無線通信制御方法。   A wireless communication control method for a wireless access point that performs wireless communication with a wireless terminal is configured to gradually decrease a wireless transmission output from a specified value while measuring a communication speed when transmitting / receiving a signal to / from the wireless terminal. And setting the wireless transmission output to a value that does not decrease the communication speed. 無線アクセスポイントと無線端末との間で無線通信を行う無線通信制御方法は、前記無線アクセスポイント及び前記無線端末のそれぞれにおいて、相手に対するダミーデータの送信の通信速度を測定しながら無線送信出力を規定値から徐々に下げていき、前記通信速度が低下しない値に前記無線送信出力を設定することを特徴とする無線通信制御方法。
A wireless communication control method for performing wireless communication between a wireless access point and a wireless terminal specifies a wireless transmission output at each of the wireless access point and the wireless terminal while measuring a communication speed of transmission of dummy data to the other party. A wireless communication control method, wherein the wireless transmission output is set to a value that gradually decreases from a value and does not decrease the communication speed.
JP2004212456A 2004-07-21 2004-07-21 Radio communication control method and radio terminal device Pending JP2006033654A (en)

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JP2008072487A (en) * 2006-09-14 2008-03-27 Ricoh Co Ltd Wireless communication apparatus, communication method, and program
US8145767B2 (en) 2006-11-16 2012-03-27 Sharp Kabushiki Kaisha Sensor device, server node, sensor network system, method of establishing communication path, control program, and storage medium
JP2009061263A (en) * 2007-08-16 2009-03-26 Fujifilm Corp Radiation image capturing system, and method of setting minimum transmission radio field intensity in the system
JP2009078087A (en) * 2007-09-27 2009-04-16 Fujifilm Corp Radiation image capturing apparatus
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JP2011186982A (en) * 2010-03-11 2011-09-22 Ricoh Co Ltd Communication device
JP2012175127A (en) * 2011-02-17 2012-09-10 Nec Access Technica Ltd Wireless communication device, its communication area control method, and program
JP2014003471A (en) * 2012-06-19 2014-01-09 Nec Access Technica Ltd Wireless communication device, wireless communication system and transmission output control method of wireless communication device
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JPWO2015040687A1 (en) * 2013-09-18 2017-03-02 株式会社日立産機システム Positioning signal radiation parameter setting method and positioning system

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