JP2005323150A - Wireless information communication method, wireless communication terminal, and wireless communication master station - Google Patents
Wireless information communication method, wireless communication terminal, and wireless communication master station Download PDFInfo
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Abstract
【課題】無線ネットワークにおける無線通信端末間のスループットを向上させる。
【解決手段】ＡＰの配下で、他の通信機器と通信するための無線通信端末であって、インフラストラクチャモード通信時、送信先の無線通信端末がＡＰに対して返信するＡＣＫを傍受する受信手段と、前記受信手段によって受信したＡＣＫの電波受信強度が一定レベル以上にあるか否かを判断する受信感度判定手段と、前記送信先無線通信端末との受信感度が良好と判断された場合、動的にＲＴＳ／ＣＴＳを無効にし且つインフラストラクチャモードから端末間直接通信モードに変更する切替え指示手段と、前記切替え指示手段による端末間直接通信時、送信バッファ内の送信データフレーム数が閾値を上回るか否か判断する閾値超過判定手段と、前記送信バッファ内の送信データフレーム数が前記閾値を上回る場合、前記送信データフレームを連続送信する通信制御部を有する。
【選択図】図４A throughput between wireless communication terminals in a wireless network is improved.
A wireless communication terminal for communicating with another communication device under the control of an AP, and receiving means for intercepting an ACK sent back to the AP by a destination wireless communication terminal during infrastructure mode communication And the reception sensitivity determination means for determining whether or not the radio wave reception intensity of the ACK received by the reception means is above a certain level, and the reception sensitivity between the transmission destination wireless communication terminal and Switching instruction means for disabling RTS / CTS and changing from infrastructure mode to terminal-to-terminal direct communication mode, and whether the number of transmission data frames in the transmission buffer exceeds a threshold at the time of direct communication between terminals by the switching instruction means A threshold value excess judging means for judging whether or not the number of transmission data frames in the transmission buffer exceeds the threshold value. The a communication control section for continuous transmission.
[Selection] Figure 4
Description
本発明は、無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）等の無線ネットワークにおける無線通信端末の無線情報通信方法に関し、より特定的には無線通信端末間のスループットを向上させるための無線情報通信方法、ならびにその無線情報通信方法を用いて動作する無線通信端末およびＡＰ（無線通信親局）に関するものである。 The present invention relates to a wireless information communication method for wireless communication terminals in a wireless network such as a wireless LAN (Local Area Network), and more specifically, a wireless information communication method for improving throughput between wireless communication terminals, and the wireless communication method thereof. The present invention relates to a wireless communication terminal and an AP (wireless communication master station) that operate using an information communication method.
無線ＬＡＮの標準仕様であるＩＥＥＥ８０２．１１では、インフラストラクチャモード時にお互いが見えない無線通信端末同士が同時にＡＰにフレームを送信することを回避する方法として、ＲＴＳ／ＣＴＳ（Ｒｅｑｕｅｓｔ Ｔｏ Ｓｅｎｄ／Ｃｌｅａｒ Ｔｏ Ｓｅｎｄ）というアクセス制御方法を定めている。 In IEEE 802.11, which is a standard specification for wireless LAN, RTS / CTS (Request To Send / Clear To Send) is a method for avoiding wireless communication terminals that cannot see each other in the infrastructure mode from transmitting frames to the AP at the same time. ) Is defined.
図１は、インフラストラクチャモード（ＡＰ経由通信）時における前記従来のＲＴＳ／ＣＴＳのフレーム送受信を示すものである。 FIG. 1 shows the conventional RTS / CTS frame transmission / reception in the infrastructure mode (communication via AP).
図１において、無線通信端末１は、ＡＰに対してＲＴＳフレームを送信する。前記ＲＴＳフレームを受信した前記ＡＰは、ＣＴＳフレームを返信して無線通信端末１に送信権を与える。前記ＣＴＳフレームは、許可された以外の無線通信端末（無線通信端末２）も受信する。前記ＣＴＳフレームの中には、無線通信端末１のデータフレーム送信からＡＣＫ返信までに必要な時間が書き込まれており、他の無線通信端末（無線通信端末２）は競合が生じないように、前記時間だけ待機してから送信を開始する。このため、図１に示したような隠れ端末の問題を回避することができる。 In FIG. 1, a wireless communication terminal 1 transmits an RTS frame to an AP. The AP that has received the RTS frame returns a CTS frame to give the wireless communication terminal 1 a transmission right. The CTS frame is also received by wireless communication terminals (wireless communication terminal 2) other than those permitted. In the CTS frame, the time required from the data frame transmission of the wireless communication terminal 1 to the ACK return is written, and the other wireless communication terminal (wireless communication terminal 2) does not cause contention, so that Wait for a certain amount of time before starting transmission. For this reason, the problem of a hidden terminal as shown in FIG. 1 can be avoided.
また、特許文献１では、このような隠れ端末が存在するか否かを通信に先立って予め確認しておき、それをメモリに記憶しておくという方法が提案されている。
しかしながら、前記従来の方法では、通信に先立って送信権を確保するという余分なシーケンスが発生するため、スループットの劣化という課題を有していた。さらに、移動する無線通信端末があるような場合には、お互いが見える近距離になった、すなわち隠れ端末ではない無線通信端末同士であってもＲＴＳ／ＣＴＳの送受信をしなければならないという課題を有していた。 However, the conventional method has a problem of throughput degradation because an extra sequence for securing a transmission right occurs prior to communication. Furthermore, when there is a moving wireless communication terminal, there is a problem that RTS / CTS must be transmitted / received even if the wireless communication terminals are close to each other, that is, are not hidden terminals. Had.
また、特許文献１でも、下記のような課題を有する。 Also, Patent Document 1 has the following problems.
隠れ端末が存在するか否かを、事前にＲＴＳ／ＣＴＳフレームの送受信により確認する必要があるため、その際に余分なシーケンスが発生する。 Since it is necessary to confirm in advance whether or not there is a hidden terminal by transmitting and receiving an RTS / CTS frame, an extra sequence occurs at that time.
全フレームのやり取りをモニタする必要がある。さらに、移動する無線通信端末があるような無線システムでは、メモリに記憶されている隠れ端末と現時点での隠れ端末が一致しない可能性があり、定期的にメモリの更新を必要とする。 It is necessary to monitor the exchange of all frames. Furthermore, in a wireless system in which there is a moving wireless communication terminal, there is a possibility that the hidden terminal stored in the memory does not match the current hidden terminal, and the memory needs to be updated periodically.
本発明は、前記従来の課題を解決するもので、ＡＰ経由通信中、データフレームを送受信する無線通信端末同士の電波受信感度が良好な場合、余分なシーケンスやメモリの更新を必要とせず動的にＲＴＳ／ＣＴＳ機能を無効にする。また、これに連動してＡＰ経由通信から端末間直接通信に切替える。さらに、送信元無線通信端末の送信バッファ内の送信データフレーム数が事前に設定された閾値を超過し且つＡＰが許可した場合に、前記送信データフレームを従来よりも短いインターバルで連続送信させることで、前記無線通信端末間のスループットをさらに向上させ、且つ送信元無線通信端末の送信バッファあふれも回避させる無線情報通信方法を提供することを目的とする。 The present invention solves the above-described conventional problems. When radio wave reception sensitivity between wireless communication terminals that transmit and receive data frames is good during communication via an AP, an extra sequence or memory is not required to be updated dynamically. Disable the RTS / CTS function. In conjunction with this, the communication is switched from communication via AP to direct communication between terminals. Further, when the number of transmission data frames in the transmission buffer of the transmission source wireless communication terminal exceeds a preset threshold value and the AP permits, the transmission data frames are continuously transmitted at a shorter interval than before. Another object of the present invention is to provide a wireless information communication method that further improves the throughput between the wireless communication terminals and avoids overflow of the transmission buffer of the transmission source wireless communication terminal.
前記従来の課題を解決するために、本発明の無線通信端末は、インフラストラクチャモード通信時、送信先の無線通信端末がＡＰに対して返信するＡＣＫを傍受するための受信手段を有し、前記受信手段によって受信した前記ＡＣＫの電波受信強度が一定レベル以上にあるかどうかを判断する受信感度判定手段を有する。前記受信感度判定手段によって前記送信先の無線通信端末との受信感度が良好と判断された場合、ＲＴＳ／ＣＴＳを無効にし且つインフラストラクチャモードから端末間直接通信モードに変更する切替え指示手段を有する。前記切替え指示手段により、端末間直接通信になった場合、送信バッファ内の送信データフレーム数が閾値を上回るかどうか判断する閾値超過判定手段と、前記閾値超過判定手段によって前記送信バッファ内の送信データフレーム数が前記閾値を上回る場合、データフレーム送信間隔をＳＩＦＳ間隔に切替え連続送信を行う通信制御部とを有する。 In order to solve the conventional problem, the wireless communication terminal of the present invention has a receiving means for intercepting an ACK sent back to the AP by the wireless communication terminal of the transmission destination during the infrastructure mode communication, Receiving sensitivity determining means for determining whether the radio wave receiving intensity of the ACK received by the receiving means is above a certain level. When the reception sensitivity determination unit determines that the reception sensitivity with the transmission destination wireless communication terminal is good, the switch has a switching instruction unit that invalidates RTS / CTS and changes from the infrastructure mode to the inter-terminal direct communication mode. When the switching instruction means causes direct communication between terminals, the threshold excess determination means for determining whether or not the number of transmission data frames in the transmission buffer exceeds the threshold, and the transmission data in the transmission buffer by the threshold excess determination means A communication control unit that performs continuous transmission by switching the data frame transmission interval to a SIFS interval when the number of frames exceeds the threshold.
本構成によって、データフレームを送受信する無線通信端末同士の受信感度が良好と判断された場合、送信元無線通信端末のＲＴＳ／ＣＴＳ機能を無効にすると同時に、端末間直接通信に切替え、さらに前記送信元無線通信端末における送信バッファ内の送信データフレーム数が事前に設定された閾値を上回る場合、データフレーム送信間隔をＳＩＦＳ間隔に切替え連続送信することで、スループットを向上させ、且つ送信元無線通信端末の送信バッファあふれも回避させる無線情報通信方法の提供を目的とする。 With this configuration, when it is determined that the reception sensitivity between wireless communication terminals that transmit and receive data frames is good, the RTS / CTS function of the transmission source wireless communication terminal is disabled, and at the same time, switching to direct communication between terminals is performed, and the transmission is further performed. When the number of transmission data frames in the transmission buffer in the original wireless communication terminal exceeds a preset threshold, the data frame transmission interval is switched to the SIFS interval to continuously transmit, thereby improving the throughput and the transmission source wireless communication terminal An object of the present invention is to provide a wireless information communication method that avoids overflow of the transmission buffer.
本発明の無線情報通信方法によれば、インフラストラクチャモードでデータフレームを送受信する無線通信端末同士の受信感度が良好と判断された場合、送信元無線通信端末のＲＴＳ／ＣＴＳ機能を無効にし、端末間直接通信に切替える。さらに、前記送信元無線通信端末における送信バッファ内の送信データフレーム数が事前に設定された閾値を上回る場合、データフレーム送信間隔をＳＩＦＳ間隔に切替え連続送信することで、さらなるスループットの向上、および送信バッファあふれを回避させることができる。 According to the wireless information communication method of the present invention, when it is determined that the reception sensitivity between wireless communication terminals that transmit and receive data frames in the infrastructure mode is good, the RTS / CTS function of the transmission source wireless communication terminal is disabled, and the terminal Switch to direct communication. Further, when the number of transmission data frames in the transmission buffer in the transmission source wireless communication terminal exceeds a preset threshold value, the data frame transmission interval is switched to the SIFS interval to continuously transmit, thereby further improving the throughput and transmission. Buffer overflow can be avoided.
以下本発明の実施の形態について、図面を参照しながら説明する。 Embodiments of the present invention will be described below with reference to the drawings.
（実施の形態１）
図２及び図３は、本発明の実施の形態を示す流れ図である。図４はＲＴＳ／ＣＴＳのフレーム構成を示す図である。図５は本発明の無線通信端末のブロック図である。図６は本発明のＡＰのブロック図である。
(Embodiment 1)
2 and 3 are flowcharts showing the embodiment of the present invention. FIG. 4 is a diagram showing the frame structure of RTS / CTS. FIG. 5 is a block diagram of the wireless communication terminal of the present invention. FIG. 6 is a block diagram of the AP of the present invention.
図２及び図３では、無線通信端末１から無線通信端末２へ送信要求が発生した場合を示す。通常、データフレームは複数個発生する。 2 and 3 show a case where a transmission request is generated from the wireless communication terminal 1 to the wireless communication terminal 2. FIG. Usually, a plurality of data frames are generated.
ＩＥＥＥ８０２．１１に準拠した現行の無線ＬＡＮ製品と同様に、無線通信端末１のＲＴＳ／ＣＴＳは無効、通信モードはインフラストラクチャモード（ＡＰ経由通信）を通信開始時のデフォルトとする。 Similar to the current wireless LAN products compliant with IEEE802.11, RTS / CTS of the wireless communication terminal 1 is invalid, and the communication mode is set to the infrastructure mode (communication via AP) as a default at the start of communication.
Ｓ００２にて、無線通信端末１から無線通信端末２へ送信要求が発生した場合、通信開始時にはＲＴＳ／ＣＴＳは無効となっているためＳ００５にて、無線通信端末１はＡＰを経由して無線通信端末２へデータフレームを送信する。無線通信端末２が前記ＡＰから中継されてきた前記データフレームを受信するとＳ００６にて、無線通信端末２は前記ＡＰにＡＣＫを返信する。この間Ｓ００７にて、無線通信端末１は前記ＡＣＫをキャリアセンスする。Ｓ００８にて、無線通信端末１の受信感度判定部が前記ＡＣＫの電波受信強度を一定レベル以上と判断した場合Ｓ０１１にて、無線通信端末１は無線通信端末２が近距離で、且つ無線通信端末２とは良好な通信状態であることを認識できる。この場合Ｓ０１２にて、無線通信端末１のＲＴＳ／ＣＴＳが有効であればＳ０１３にて、無線通信端末１の切替指示部はＲＴＳ／ＣＴＳを無効にし、これと連動しＳ０１４にて、ＡＰ経由通信から端末間直接通信に切替えるように通信制御部に指示する。ここで、無線通信端末１は自送信フレームにおけるＭＡＣヘッダのＴｏＤＳ（Ｔｏ Ｄｉｓｔｒｉｂｕｔｉｏｎ Ｓｙｓｔｅｍ）フィールドを０、ＲＡ（Ｒｅｃｅｉｖｅｒ Ａｄｄｒｅｓｓ）を無線通信端末２のＭＡＣアドレスに変更することで、前記端末間直接通信が可能となる。さらにＳ０１５にて、無線通信端末１の閾値超過判定部により、送信バッファ内データフレーム数が事前に設定された閾値以上であると判断された場合Ｓ０１９にて、無線通信端末１は前記ＡＰにＲＴＳを送信する。 When a transmission request is generated from the wireless communication terminal 1 to the wireless communication terminal 2 in S002, since the RTS / CTS is invalid at the start of communication, the wireless communication terminal 1 performs wireless communication via the AP in S005. A data frame is transmitted to the terminal 2. When the wireless communication terminal 2 receives the data frame relayed from the AP, the wireless communication terminal 2 returns an ACK to the AP in S006. During this time, in S007, the wireless communication terminal 1 performs carrier sense on the ACK. In S008, when the reception sensitivity determination unit of the wireless communication terminal 1 determines that the radio wave reception intensity of the ACK is equal to or higher than a certain level, in S011, the wireless communication terminal 1 is close to the wireless communication terminal 2 and the wireless communication terminal 2 can be recognized as a good communication state. In this case, if the RTS / CTS of the wireless communication terminal 1 is valid in S012, the switching instruction unit of the wireless communication terminal 1 invalidates the RTS / CTS in S013, and in conjunction with this, the communication via the AP is performed in S014. The communication control unit is instructed to switch to direct communication between terminals. Here, the wireless communication terminal 1 changes the ToDS (To Distribution System) field of the MAC header in its own transmission frame to 0 and the RA (Receiver Address) to the MAC address of the wireless communication terminal 2, thereby enabling direct communication between the terminals. It becomes possible. Further, in S015, when the threshold excess determination unit of the wireless communication terminal 1 determines that the number of data frames in the transmission buffer is equal to or greater than a preset threshold value, in S019, the wireless communication terminal 1 sends an RTS to the AP. Send.
なお、ユーザは前記閾値を任意に変更できる。 The user can arbitrarily change the threshold value.
Ｓ０１９にて、送信バッファ内データフレーム数が前記閾値以上であると判断された無線通信端末１は前記ＲＴＳフレーム内に端末間直接通信要求と、前記送信バッファ内のデータフレーム数が前記閾値以下となるまでに通信に要する要求帯域（時間）を明示する。ＩＥＥＥ８０２．１１の従来のＲＴＳフレームはサブタイプ値（識別子）を１０１１、ＣＴＳフレームのサブタイプ値（識別子）を１１００と規定しているが、００００から１００１はＲｅｓｅｒｖｅｄとして規定されていない。無線通信端末１は前記００００から１００１までの任意のサブタイプ値を使用して送信したＲＴＳフレームが端末間直接通信要求であることを明示する。 In S019, the wireless communication terminal 1 that is determined that the number of data frames in the transmission buffer is equal to or greater than the threshold value is a request for direct communication between terminals in the RTS frame, and the number of data frames in the transmission buffer is equal to or less than the threshold value. Explicitly indicate the required bandwidth (time) required for communication. The conventional RTS frame of IEEE 802.11 defines the subtype value (identifier) as 1011 and the subtype value (identifier) of the CTS frame as 1100, but 0000 to 1001 are not defined as Reserved. The radio communication terminal 1 clearly indicates that the RTS frame transmitted using any subtype value from 0000 to 1001 is a request for direct communication between terminals.
次にＳ０２０にて、前記ＡＰが自セル内のネットワーク負荷に応じて前記端末間直接通信要求と要求帯域（時間）を許可した場合、すなわちＡＰの通信制御部が自セル内のネットワークが低負荷であり、無線通信端末１の要求する帯域の割り当てが可能と判断した場合、無線通信端末１にＣＴＳフレームを返信する。無線通信端末１が前記ＣＴＳフレームを受信した場合Ｓ０２１にて、無線通信端末１は前記送信バッファ内データフレーム数が閾値以下となるまでＳＩＦＳ（Ｓｈｏｒｔ Ｉｎｔｅｒ Ｆｒａｍｅ Ｓｐａｃｅ）間隔での連続送信を行う。この間、他の無線通信端末は前記ＣＴＳフレームに明示された使用帯域（時間）だけ送信を待機する。 Next, when the AP permits the inter-terminal direct communication request and the requested bandwidth (time) according to the network load in the own cell in S020, that is, the AP communication control unit has a low load on the network in the own cell. When it is determined that the bandwidth requested by the wireless communication terminal 1 can be allocated, a CTS frame is returned to the wireless communication terminal 1. When the wireless communication terminal 1 receives the CTS frame, in S021, the wireless communication terminal 1 performs continuous transmission at SIFS (Short Inter Frame Space) intervals until the number of data frames in the transmission buffer is equal to or less than a threshold value. During this time, other wireless communication terminals wait for transmission for the use band (time) specified in the CTS frame.
なお、前記連続送信時のフレームインターバルはＳＩＦＳとしているが、従来のＤＩＦＳ（Ｄｉｓｔｒｉｂｕｔｅｄ Ｉｎｔｅｒ Ｆｒａｍｅ Ｓｐａｃｅ）よりも短いものであれば任意のフレームインターバルでもよい。 The frame interval during continuous transmission is SIFS, but any frame interval may be used as long as it is shorter than a conventional DIFS (Distributed Inter Frame Space).
Ｓ０２０にて、送信バッファ内データフレーム数が前記閾値以上であると判断された無線通信端末１がＡＰからのＣＴＳフレームを受信できなかった場合、無線通信端末１は１個目のデータフレームに関しては従来通りＤＩＦＳ間隔で送信するが、Ｓ０２６にて、通信状況が悪化しなければＳ０１９へ遷移する。無線通信端末１は、この時点の送信バッファ内のデータフレーム数が前記閾値以下となるまでに通信に要する要求時間を再度算出し、要求帯域（時間）を更新したＲＴＳフレームの再送を行う。 If the wireless communication terminal 1 determined that the number of data frames in the transmission buffer is equal to or larger than the threshold in S020 cannot receive the CTS frame from the AP, the wireless communication terminal 1 regards the first data frame. Although transmission is performed at DIFS intervals as before, if the communication status does not deteriorate in S026, the process proceeds to S019. The wireless communication terminal 1 recalculates the request time required for communication until the number of data frames in the transmission buffer at this time becomes equal to or less than the threshold value, and retransmits the RTS frame whose request bandwidth (time) has been updated.
Ｓ０１５にて、無線通信端末１の送信バッファ内データフレーム数が前記閾値以下であればＳ０１６にて、無線通信端末１はＲＴＳ／ＣＴＳを無効とした状態で端末間直接通信を行う。Ｓ０１７にて、無線通信端末２からのＡＣＫの電波受信感度が悪化した場合Ｓ０１８にて、無線通信端末１はＡＰ経由通信を有効にするとともにＳ０１０にて、ＲＴＳ／ＣＴＳも有効にする。 If the number of data frames in the transmission buffer of the wireless communication terminal 1 is equal to or less than the threshold value in S015, the wireless communication terminal 1 performs direct communication between terminals with RTS / CTS disabled in S016. In S017, when the radio wave reception sensitivity of the ACK from the wireless communication terminal 2 deteriorates, in S018, the wireless communication terminal 1 enables communication via AP and also enables RTS / CTS in S010.
このように、データフレームを送受信する無線通信端末同士が近距離で且つ良好な通信状態である場合、ＲＴＳ／ＣＴＳを無効にすると同時に端末間直接通信に切替える。 As described above, when wireless communication terminals that transmit and receive data frames are in a short distance and in a good communication state, RTS / CTS is invalidated and at the same time, direct communication between terminals is switched.
さらに、送信元無線通信端末における送信バッファ内の送信データフレーム数が事前に設定された閾値を上回る場合、データフレーム送信間隔をＳＩＦＳ間隔に切替え連続送信を行うことで余分なオーバーヘッドがなくなりスループットが向上する。ここで、送信元無線通信端末と送信先無線通信端末は近距離で且つ良好な通信状態のため、ＲＴＳ／ＣＴＳを無効にすること、および端末間直接通信に切替えることによる問題は生じない。 Furthermore, when the number of transmission data frames in the transmission buffer in the transmission source wireless communication terminal exceeds a preset threshold, the data frame transmission interval is switched to the SIFS interval, and continuous transmission is performed to eliminate unnecessary overhead and improve throughput. To do. Here, since the transmission source wireless communication terminal and the transmission destination wireless communication terminal are close to each other and in a good communication state, there is no problem caused by disabling RTS / CTS and switching to direct communication between terminals.
なお、本発明におけるＡＰ、無線通信端末のそれぞれ固有のソフトウェア（ファームウェア）は、ＡＰ、無線通信端末ともに通信制御部のローカルバスに接続されたＲＯＭに格納されているものとする。 Note that software (firmware) unique to each of the AP and the wireless communication terminal in the present invention is stored in a ROM connected to the local bus of the communication control unit for both the AP and the wireless communication terminal.
本発明にかかる無線通信端末の無線情報通信方法は、データフレームを送受信する無線通信端末同士の受信感度が良好な場合、動的にＲＴＳ／ＣＴＳ機能を無効にすると同時に通信モードを端末間直接通信に切替える。さらに、前記した特定の条件を満足した場合、送信元無線通信端末の送信バッファに蓄積された送信データフレームを短いインターバルで連続送信することで、オーバーヘッドの低減とスループットの向上、さらには送信バッファあふれを回避させることができ、移動する無線通信端末があるような無線ＬＡＮ等の無線ネットワークに用いられる無線通信端末に有用となる。 In the wireless information communication method of the wireless communication terminal according to the present invention, when the reception sensitivity between wireless communication terminals that transmit and receive data frames is good, the RTS / CTS function is dynamically disabled and the communication mode is directly communicated between the terminals. Switch to. Furthermore, when the above-mentioned specific conditions are satisfied, transmission data frames accumulated in the transmission buffer of the source wireless communication terminal are continuously transmitted at short intervals, thereby reducing overhead and improving throughput, and further overflowing the transmission buffer. This is useful for a wireless communication terminal used in a wireless network such as a wireless LAN where there is a moving wireless communication terminal.
１，２ 無線通信端末 1, 2 Wireless communication terminal
Claims (9)
インフラストラクチャモード（ＡＰ経由）通信時、送信元無線通信端末が、送信先無線通信端末のＡＰに対するＡＣＫを受信（傍受）するステップと、
前記送信元無線通信端末が前記ＡＣＫの受信強度を一定レベル以上かどうか判定するステップと、
前記ＡＣＫが一定レベル以上の受信強度の場合、前記送信元無線通信端末がＲＴＳ／ＣＴＳ機能を無効とし、さらに通信モードをインフラストラクチャモードから端末間直接通信に切替えるステップと、
前記端末間直接通信時、前記送信元無線通信端末の送信バッファ内の送信データフレーム数に応じて前記送信データフレームを連続送信するステップとを備える、無線情報通信方法。 A wireless information communication method of a wireless communication terminal existing in a cell of a wireless base station (AP: access point),
A step of receiving (intercepting) an ACK to the AP of the transmission destination wireless communication terminal at the time of infrastructure mode (via AP) communication;
Determining whether the source wireless communication terminal has a reception strength of the ACK equal to or higher than a certain level;
When the ACK has a reception strength of a certain level or more, the source wireless communication terminal disables the RTS / CTS function, and further switches the communication mode from infrastructure mode to direct communication between terminals;
And a step of continuously transmitting the transmission data frames according to the number of transmission data frames in a transmission buffer of the transmission source wireless communication terminal during the direct communication between the terminals.
インフラストラクチャモード通信時、送信先の無線通信端末がＡＰに対して返信するＡＣＫを傍受するための受信手段と、
前記受信手段によって受信したＡＣＫの電波受信強度が一定レベル以上にあるかどうかを判断する受信感度判定手段と、
前記受信感度判定手段によって送信先無線通信端末との受信感度が良好と判断された場合、動的にＲＴＳ／ＣＴＳを無効にし且つインフラストラクチャモードから端末間直接通信モードに変更する切替え指示手段と、
前記切替え指示手段による端末間直接通信時、送信バッファ内の送信データフレーム数が閾値を上回るかどうか判断する閾値超過判定手段と、
前記閾値超過判定手段によって前記送信バッファ内の送信データフレーム数が前記閾値を上回る場合、前記送信データフレームを連続送信する通信制御部
とを有する、無線通信端末。 A wireless communication terminal for communicating with other communication devices under the control of an AP,
During infrastructure mode communication, a receiving means for intercepting an ACK sent back to the AP by the destination wireless communication terminal;
Reception sensitivity determination means for determining whether the radio wave reception intensity of the ACK received by the reception means is above a certain level;
A switching instruction means for dynamically disabling RTS / CTS and changing from the infrastructure mode to the direct communication mode between terminals when the reception sensitivity determination means determines that the reception sensitivity with the transmission destination wireless communication terminal is good;
At the time of direct communication between terminals by the switching instruction means, a threshold excess determination means for determining whether the number of transmission data frames in the transmission buffer exceeds a threshold
A wireless communication terminal comprising: a communication control unit configured to continuously transmit the transmission data frames when the number of transmission data frames in the transmission buffer exceeds the threshold by the threshold excess determination unit.
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