JP2005341436A - Radio device, radio communications system, radio communication method, and program - Google Patents

Radio device, radio communications system, radio communication method, and program Download PDF

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JP2005341436A
JP2005341436A JP2004160205A JP2004160205A JP2005341436A JP 2005341436 A JP2005341436 A JP 2005341436A JP 2004160205 A JP2004160205 A JP 2004160205A JP 2004160205 A JP2004160205 A JP 2004160205A JP 2005341436 A JP2005341436 A JP 2005341436A
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receiver
radio
carrier sense
transmitting
load
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JP4389670B2 (en
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Takayoshi Hayashi
隆好 林
Takaaki Hatakeuchi
孝明 畠内
Yohei Hosooka
洋平 細岡
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Fuji Electric Co Ltd
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Fuji Electric Holdings Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

<P>PROBLEM TO BE SOLVED: To optimize power consumption of a radio communications system as a whole according to a load of a radio communication section in a radio communications system in which a receiver on a receiving side radio device senses an intermittent carrier. <P>SOLUTION: In a radio device in which a receiver on a receiving side radio device senses an intermittent carrier, an operation mode control position 4 and an operation mode determining portion 5 determine whether a control information portion constituting a carrier sense time and a startup message transmitted by a transmitting side radio device is intermittently transmitted, without changing the carrier sense interval of a receiver 1 of the receiving side radio device, according to a load of a communication section obtained by a load measuring portion 6. Furthermore, when the control information portion is intermittently transmitted, its interval is determined, and the operation of the receiving and the transmitting side radio device is controlled so that the determined carrier sense time and the control information portion become an intermittent interval. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、無線通信技術に関し、特に、無線通信システムおいて、消費電力を低下させるために受信動作を間欠的に行う無線機であって、更に、無線通信区間の負荷に応じて無線通信システム全体における消費電力を最適化する通信方法に関する。   The present invention relates to a radio communication technique, and more particularly, to a radio apparatus that intermittently performs a reception operation in order to reduce power consumption in a radio communication system, and further, according to a load in a radio communication section. The present invention relates to a communication method for optimizing overall power consumption.

従来の無線通信システムにおいて、無線機の消費電力を低下させるために、無線機中の受信機を間欠的に駆動するものがある。このような無線機の例として特許文献１のようなものがある。このシステムにおいて、送信側の無線機は、受信先の識別情報などからなる制御情報部が冗長に複数連続した起動電文と、送信データとからなるパケットを送信する。パケット中の起動電文を送信するのにかかる時間は、無線機中の受信機の駆動間隔以上であるため、受信側の無線機は、起動電文中のいずれかの制御情報部をキャリアセンスすることになる。キャリアセンスの結果、データの送信先が自局であると判断された場合、受信側の無線機の受信機は駆動状態となり、データを受信することができる。   Some conventional wireless communication systems drive a receiver in a wireless device intermittently in order to reduce the power consumption of the wireless device. There exists a thing like patent document 1 as an example of such a radio | wireless machine. In this system, a transmitting-side radio transmits a packet composed of a startup message in which a plurality of redundant control information sections including identification information of a reception destination and the like and redundant transmission data are transmitted. Since the time taken to transmit the startup message in the packet is equal to or longer than the drive interval of the receiver in the radio, the receiving radio must carrier sense any control information part in the startup message. become. As a result of the carrier sense, when it is determined that the data transmission destination is the local station, the receiver of the receiving side radio device is in a driving state and can receive data.

このようなシステムでは、データを受信するまでにある一定の時間が必要となるが、常時受信機を起動状態にしている無線機と比較して、消費電力を低く抑えることが可能である。従って、このような無線通信システムは、受信側の無線機が電池で長時間駆動する小領域無線機、例えば、検針無線機、センサーネット無線機などに広く利用されており、またユビキタスコンピューティングが唱えられている今日、今後、環境に遍在する情報処理装置等に応用することも考えられる。
特開平１１−２７１９７号公報 In such a system, a certain amount of time is required until data is received, but it is possible to reduce power consumption as compared with a wireless device in which a receiver is always activated. Therefore, such a wireless communication system is widely used for small-area wireless devices in which a receiving-side wireless device is driven by a battery for a long time, for example, a meter reading wireless device, a sensor network wireless device, and ubiquitous computing. Today, it can be applied to information processing devices that are ubiquitous in the environment.
Japanese Patent Laid-Open No. 11-27197

上述のように従来の無線機では、受信機を間欠駆動させ、受信待ち受け時の消費電力を低下させている。このため、送信側の無線機の送信機は、受信側無線機の受信機が正確にパケットを受信できるように、受信機の駆動間隔以上の長さの起動電文を送信する必要がある。一般に、受信動作に必要な消費電流に対して送信動作に必要な消費電流は大きいと言われる。したがって、無線通信区間の負荷が増加するに従い、送信にかかる消費電流が増加するために、無線通信システム全体においては消費電力を抑えるという効果が著しく低下すると言える。   As described above, in the conventional wireless device, the receiver is intermittently driven to reduce power consumption during reception standby. For this reason, it is necessary for the transmitter of the transmitter radio to transmit an activation message having a length longer than the drive interval of the receiver so that the receiver of the receiver radio can receive the packet accurately. In general, it is said that the current consumption required for the transmission operation is larger than the current consumption required for the reception operation. Therefore, since the current consumption for transmission increases as the load in the wireless communication section increases, it can be said that the effect of suppressing the power consumption is remarkably reduced in the entire wireless communication system.

そこで、本発明の課題は、無線通信区間の負荷に応じて無線通信システム全体における消費電力を最適化する通信システムおよびその方法を提供することである。   Therefore, an object of the present invention is to provide a communication system and method for optimizing power consumption in the entire wireless communication system in accordance with the load of the wireless communication section.

上述した課題を解決するために、本発明では、送信側の無線機に通信区間の負荷を計測する機能を設け、また、受信側の無線機のキャリアセンス時間を可変にすることで負荷に応じて送信側の無線機が送信する起動電文を間欠的に送信できるようにした。すなわち、通信区間が高負荷の場合は、冗長な制御情報部のうちいくつか間引くことで、実質的に起動電文長を短くし、送信機の駆動時間を短くすることができ、送信時の消費電力を低く抑えることができるようにした。   In order to solve the above-described problems, in the present invention, a function of measuring a load in a communication section is provided in a transmitting-side radio, and the carrier sense time of the receiving-side radio is made variable so as to respond to the load. Now, the startup message sent by the transmitting radio can be sent intermittently. In other words, when the communication section is heavily loaded, by thinning out some of the redundant control information parts, the startup message length can be substantially shortened and the transmitter drive time can be shortened. The power can be kept low.

本発明の一態様は、受信側無線機の受信機が間欠キャリアセンスする無線通信システムにおける送信側無線機であって、パケットを送信する送信機と、データ受信を行う受信機と、自局が一定時間に前記送信機から送信するパケット数に基づいて、通信区間の負荷を計測する負荷計測手段と、前記負荷計測手段の計測結果に基づいて、通信区間の負荷に応じて、前記受信側無線機の受信機のキャリアセンス間隔は同一で、該受信機のキャリアセンス時間および送信側無線機が送信する制御情報部の送信休止間隔がそれぞれ異なる二つ以上の動作モードのうちいずれかの動作モードで送信側無線機および受信側無線機を動作させるかを決定する動作モード決定手段と、前記決定された動作モードに変更するように要求を相手局に前記送信機を介して送信し、前記受信機のより相手局から応答を受信すると、自局の動作モードを変更する動作モード制御手段と、を備える。   One aspect of the present invention is a transmitting-side radio in a radio communication system in which a receiver of a receiving-side radio performs intermittent carrier sensing, in which a transmitter that transmits a packet, a receiver that receives data, Based on the number of packets transmitted from the transmitter at a certain time, load measuring means for measuring the load in the communication section, and based on the measurement result of the load measuring means, the receiving-side radio according to the load in the communication section The carrier sense interval of the receiver of the receiver is the same, and any one of two or more operation modes in which the carrier sense time of the receiver and the transmission pause interval of the control information section transmitted by the transmitter radio are different from each other Operation mode determining means for determining whether to operate the transmitting-side radio and the receiving-side radio, and a request to change to the determined operating mode via the transmitter Send Te, comprising upon receiving a response from a more distant station of the receiver, the operation mode control means for changing the operation mode of the own station.

また、本発明の一態様は、受信側無線機の受信機が間欠キャリアセンスをする無線通信システムにおける受信側無線機であって、パケットを送信する送信機と、間欠的に駆動され、キャリアセンスまたはデータ受信を行う受信機と、前記受信機により相手局から動作モード変更要求を受信すると、該要求に基づいて、前記受信機のキャリアセンス間隔は変えずに、キャリアセンス時間を変更するとともに、該相手局に応答を前記送信機を介して送信する動作モード制御手段と、を備える。   Another embodiment of the present invention is a reception-side radio in a radio communication system in which a receiver of a reception-side radio performs intermittent carrier sense, which is intermittently driven with a transmitter that transmits a packet and performs carrier sense. Or, when receiving an operation mode change request from the other station by the receiver that receives data and the receiver, based on the request, without changing the carrier sense interval of the receiver, and changing the carrier sense time, Operation mode control means for transmitting a response to the counterpart station via the transmitter.

本発明によれば、無線通信区間が高負荷の場合、送信側の無線機が起動電文を間欠的に送信することが可能であり、これにより送信にかかる消費電力を低減することが可能となる。また、通信区間が低負荷の場合は従来どおり受信の消費電力を抑えた通信が可能となっており、通信区間の負荷に応じて無線通信システム全体の消費電力を最適化することができるといえる。   According to the present invention, when the wireless communication section is heavily loaded, it is possible for the wireless device on the transmission side to intermittently transmit the startup message, thereby reducing the power consumption for transmission. . In addition, when the communication section is lightly loaded, it is possible to perform communication while suppressing the power consumption of reception as usual, and it can be said that the power consumption of the entire wireless communication system can be optimized according to the load of the communication section. .

以下、図面を参照して、本発明の実施の形態について説明する。
図１は、本発明の実施の形態の無線通信システムを構成する無線機の内部構成例を示すものである。無線機は、受信機１、送信機２、データ処理および無線機制御の処理などを行うＣＰＵ３、通信区間の負荷を計測する負荷計測部６、負荷計測の結果に基づいて無線機の通信動作モードを決定する動作モード決定部５、無線機の動作モードの切り替え制御する動作モード制御部４、アンテナ７から成る。当該無線機は、双方向通信が可能であり、送信側にも受信側にも成りうる。しかしながら、以下説明を判りやすくするために、送信側無線機、受信側無線機はそれぞれ、送信側、受信側のみにしかならないとして説明を進めることにする。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of the internal configuration of a radio that constitutes a radio communication system according to an embodiment of the present invention. The wireless device includes a receiver 1, a transmitter 2, a CPU 3 that performs data processing and wireless device control processing, a load measuring unit 6 that measures a load in a communication section, and a communication operation mode of the wireless device based on the load measurement result. An operation mode determination unit 5 for determining the operation mode, an operation mode control unit 4 for controlling switching of the operation mode of the radio, and an antenna 7. The wireless device can perform two-way communication and can be a transmission side or a reception side. However, in order to make the explanation easier to understand, the explanation will be made on the assumption that the transmitting side radio device and the receiving side radio device are only the transmitting side and the receiving side, respectively.

図１において、送信側無線機は、ＣＰＵ３により起動電文およびデータとからなるパケットが生成され、該パケットは負荷計測部６を経て送信機２に送られ、送信機２からアンテナ７を経て相手局（受信側）へ送信される。負荷計測部６は、一定時間に送信されたパケット数をカウントしており、カウント結果を動作モード決定部５に伝達する。動作モード決定部５では、該カウント結果とあらかじめ決められた閾値とを比較して通信区間の負荷が高いか否かを判断する。例えば負荷が高いと判断された場合、高負荷モード通信をするという決定をし、また、負荷が低いと判断された場合、低負荷モード通信をするという決定をする。そして、その結果を動作モード制御部４に伝達する。動作モード制御部４では、動作モード決定部５の決定に基づき、相手局に動作モード変更に関わる情報を送信機２を介して送信し、その後、受信機１を介して相手局から応答を受信すると、自局の動作モードを変更する。   In FIG. 1, in the transmitting side radio device, a packet composed of a startup message and data is generated by the CPU 3, and the packet is sent to the transmitter 2 via the load measuring unit 6, and is transmitted from the transmitter 2 to the partner station via the antenna 7. Sent to (receiving side). The load measuring unit 6 counts the number of packets transmitted in a certain time, and transmits the count result to the operation mode determining unit 5. The operation mode determination unit 5 compares the count result with a predetermined threshold value to determine whether or not the load on the communication section is high. For example, when it is determined that the load is high, it is determined to perform high load mode communication. When it is determined that the load is low, it is determined to perform low load mode communication. Then, the result is transmitted to the operation mode control unit 4. Based on the determination by the operation mode determination unit 5, the operation mode control unit 4 transmits information related to the operation mode change to the partner station via the transmitter 2 and then receives a response from the partner station via the receiver 1. Then, the operation mode of the own station is changed.

また、受信側無線機では、受信機１が間欠駆動されている。受信機１により、相手局から動作モード変更に関わる情報が受信されると、該情報は動作モード制御部４に伝達され、それに基づいて受信機１の動作モードの変更が行われる。そして、動作モード変更が終わると送信機２を介して相手局（送信側）へ応答を送信する。   In the receiving-side radio device, the receiver 1 is intermittently driven. When the receiver 1 receives information related to the operation mode change from the partner station, the information is transmitted to the operation mode control unit 4, and the operation mode of the receiver 1 is changed based on the information. When the operation mode change is completed, a response is transmitted to the partner station (transmission side) via the transmitter 2.

以下、通信区間の負荷が低い場合と高い場合に合わせて、低負荷モードあるいは高負荷モードで動作する無線通信システムを例に、本発明の動作等をより詳細に説明する。
図２に通信区間の負荷が低い場合（低負荷モード）の通信を説明する図を示す。 Hereinafter, the operation of the present invention will be described in more detail using a wireless communication system operating in a low load mode or a high load mode as an example when the load in the communication section is low and high.
FIG. 2 is a diagram for explaining communication when the load on the communication section is low (low load mode).

低負荷の場合は、従来方式と同様な通信をする。送信側は制御情報部が連続的に繋がる起動電文とデータ部からなるパケットを送信する。制御情報部は、図３に示すように、ビット同期３０１、フレーム同期３０２、送信先ＩＤ３０３、受信先ＩＤ３０４、制御情報部の通し番号３０５、とから成る。起動電文は、制御情報部の通し番号３０５のみが異なり、他の部分は同一の制御情報部が連続的につながったものであり、その電文を送信するのにかかる時間は、（受信側のキャリアセンス間隔Ｔ＋制御情報部を送信するのにかかる時間Ｔａ）以上になるようにする。受信側は、キャリアセンス間隔Ｔで間欠的に受信機１を起動し、ｔ１時間の間、制御情報部の検出を行う。このとき、キャリアセンス時間ｔ１は、制御情報部を送信するのにかかる時間Ｔａの二倍（すなわち２Ｔａ）以上になるようにする。   When the load is low, the same communication as in the conventional method is performed. The transmitting side transmits a packet composed of a startup message and a data portion, to which the control information portion is continuously connected. As shown in FIG. 3, the control information section includes bit synchronization 301, frame synchronization 302, transmission destination ID 303, reception destination ID 304, and serial number 305 of the control information section. The startup message is different only in the serial number 305 of the control information part, and the other part is the one in which the same control information part is continuously connected. The time required for transmitting the message is (carrier sense on the receiving side). The interval T + the time Ta required to transmit the control information portion is set to be equal to or longer than the time T). The receiving side intermittently activates the receiver 1 at the carrier sense interval T, and detects the control information part for t1 time. At this time, the carrier sense time t1 is set to be not less than twice the time Ta required for transmitting the control information part (that is, 2Ta).

キャリアセンスにより、図３に示した制御部情報の受信先ＩＤ３０４が自局のＩＤと一致する、すなわち自局がデータの受信先であることが検出されると、図２の受信側Ａに示すように、制御情報部の通し番号３０５によりデータ部が送信されるまで受信待機時間を計算し、その時間だけ待機し、データ部が送信されるタイミングで再度受信機を駆動し、データ受信を行う。データ受信の後は、キャリアセンス間隔Ｔで受信機１を間欠的に駆動する、通常の受信動作に移行する。これにより、受信側は受信機を間欠駆動し、受信待機時の消費電力を低減することができる。尚、キャリアセンスによって自局がデータの受信先ではないと検出された場合は、図２の受信側ＢおよびＣのようにキャリアセンス間隔Ｔで受信機１を間欠的に駆動する通常の受信動作を継続する。   When it is detected by carrier sense that the reception destination ID 304 of the control unit information shown in FIG. 3 matches the ID of the own station, that is, the own station is the data reception destination, the reception side A shown in FIG. As described above, the reception waiting time is calculated until the data portion is transmitted by the serial number 305 of the control information portion, the waiting time is calculated, and the receiver is driven again at the timing when the data portion is transmitted to perform data reception. After the data reception, the operation shifts to a normal reception operation in which the receiver 1 is intermittently driven at the carrier sense interval T. As a result, the receiving side can intermittently drive the receiver to reduce power consumption during reception standby. When it is detected by the carrier sense that the local station is not the data receiving destination, the normal reception operation for intermittently driving the receiver 1 at the carrier sense interval T as in the receiving side B and C in FIG. Continue.

つぎに図４に通信区間の負荷が高い場合（高負荷モード）の通信を説明する図を示す。
高負荷の場合は、起動電文として制御情報部を、送信休止時間Δｔを挟み間欠的に送信する。このとき、起動電文を送信するのにかかる時間は低負荷の場合と同様に（受信側のキャリアセンス起動間隔Ｔ＋制御情報部を送信するのにかかる時間Ｔａ）以上になるようにする。一方、受信側は、低負荷の場合と同様にキャリアセンス間隔Ｔで間欠的に受信機１を起動するが、キャリアセンス時間をｔ２に変更し、制御部情報の検出を行う。キャリアセンス時間ｔ２は、（２×制御情報部を送信するのにかかる時間Ｔａ＋送信休止時間Δｔ）以上となるようにする。これにより、間欠的に送信される制御情報部が受信側の受信機１によって受信されることが可能となる。受信側においては、受信機のキャリアセンス時間をΔｔだけ長くするため消費電力が増加してしまうが、送信側においては制御情報部を間欠的に送信する、すなわちこのことは、起動電文における制御情報部を間引くことに相当し、実質の起動電文長を短くすることができるため、送信機を駆動する時間が減少し、送信にかかる消費電力を低減することができる。前述したように、送信動作にかかる消費電流のほうが受信動作にかかるそれよりも大きいため、通信システム全体としての消費電力の低減効果は大きいといえる。 Next, FIG. 4 shows a diagram for explaining communication when the load in the communication section is high (high load mode).
In the case of a high load, the control information unit is intermittently transmitted with a transmission suspension time Δt as an activation message. At this time, the time required for transmitting the activation message is set to be equal to or longer than the time required for transmitting the carrier sense activation interval T + the control information part on the receiving side as in the case of a low load. On the other hand, the receiver side intermittently activates the receiver 1 at the carrier sense interval T as in the case of the low load, but changes the carrier sense time to t2 and detects the control unit information. The carrier sense time t2 is set to be equal to or longer than (2 × time Ta required to transmit the control information portion + transmission pause time Δt). Thereby, the control information part transmitted intermittently can be received by the receiver 1 on the receiving side. On the reception side, the power consumption increases because the carrier sense time of the receiver is increased by Δt, but on the transmission side, the control information part is intermittently transmitted. This is equivalent to thinning out the part, and the actual startup message length can be shortened, so that the time for driving the transmitter is reduced and the power consumption for transmission can be reduced. As described above, since the current consumption for the transmission operation is larger than that for the reception operation, it can be said that the effect of reducing the power consumption of the entire communication system is great.

尚、高負荷モードの場合も、キャリアセンスにより自局がデータの受信先であると検出されると、低負荷モードの場合と同様に動作し、データ部を受信する。
図２、４を用いて低負荷モード、高負荷モード通信について説明したが、これらの通信動作の切り替えについて図５、図６を用いて説明する。 Even in the high load mode, when it is detected by the carrier sense that the local station is the data receiving destination, the operation is performed in the same manner as in the low load mode, and the data portion is received.
The low load mode and the high load mode communication have been described with reference to FIGS. 2 and 4. Switching between these communication operations will be described with reference to FIGS.

図５に、負荷に基づいて動作モードを変更するフローを示す。図５は、低負荷モードから高負荷モードに動作を切り替える場合について説明している。
通常無線機は低負荷モードで動作する。無線機は、一定時間あたりの自局の送信パケット数を常時計測し、これを負荷情報として無線機内部に保存している（Ｓ１）。これは図１における送信側無線機の負荷計測部６による処理である。このとき、送信側無線機の動作モード決定部５において、無線通信区間の負荷が無線機内部にあらかじめ記憶されている負荷の閾値を超えたと判断された場合（Ｓ２）、動作モード制御部４は、通信相手局の無線機へ動作モードを高負荷モードに変更を指示するための電文を送信機から送信させ、動作モードの変更を指示する（Ｓ３）。この電文を受信した無線機は、動作モードを高負荷に変更するとともに、応答電文を送信元の無線機に返送する。送信側の無線機は応答電文を受信すると（Ｓ４）、動作モード制御部４が自局の動作モードを変更して、一連の動作モード変更処理を終了する。 FIG. 5 shows a flow for changing the operation mode based on the load. FIG. 5 illustrates a case where the operation is switched from the low load mode to the high load mode.
Normally, the radio operates in a low load mode. The radio always measures the number of transmission packets of its own station per fixed time, and stores this as load information inside the radio (S1). This is processing by the load measuring unit 6 of the transmitting-side radio in FIG. At this time, when the operation mode determination unit 5 of the transmitting side radio device determines that the load of the radio communication section exceeds the load threshold stored in advance in the radio device (S2), the operation mode control unit 4 Then, a message for instructing to change the operation mode to the high load mode is transmitted from the transmitter to the radio device of the communication partner station, and the operation mode is instructed (S3). The wireless device that has received this message changes the operation mode to high load and returns a response message to the transmitting wireless device. When the transmitting-side radio receives the response message (S4), the operation mode control unit 4 changes the operation mode of the own station, and the series of operation mode change processing ends.

尚、これとは逆に負荷が閾値を下回った場合は、同様に動作モード変更指示の電文を送受信して、動作モードを高負荷モードから低負荷モードに変更する。
図６には、動作モードを変更する場合のシーケンスを示す。 On the other hand, when the load falls below the threshold value, similarly, an operation mode change instruction message is transmitted and received to change the operation mode from the high load mode to the low load mode.
FIG. 6 shows a sequence for changing the operation mode.

送信側無線機が電文１から４を図２で説明した低負荷モードで、順次、受信側無線機に送信している。負荷判定の結果、動作モードの変更が必要と決定されると、動作モード変更要求電文が送信側から受信側に送信される。これに対応して、受信側で動作モード変更が行われると、受信側から送信側に動作モード変更応答電文が送信される。送信側で、該動作モード変更応答電文を受信されると、電文５からは図４で説明した高負荷モードで電文が送受信される。また特に図６には図示していないが、高負荷モードから低負荷モードに変更される場合も同様なシーケンスで動作モードが変更される。   The transmitting side radio transmits the telegrams 1 to 4 sequentially to the receiving side radio in the low load mode described in FIG. As a result of the load determination, when it is determined that the operation mode needs to be changed, an operation mode change request message is transmitted from the transmission side to the reception side. Correspondingly, when the operation mode is changed on the reception side, an operation mode change response message is transmitted from the reception side to the transmission side. When the operation mode change response message is received on the transmission side, the message is transmitted and received from the message 5 in the high load mode described with reference to FIG. Although not particularly shown in FIG. 6, the operation mode is changed in the same sequence when the high load mode is changed to the low load mode.

以上、本発明の無線通信システムの実施例を詳細に説明した。
本発明によれば、無線通信区間の負荷が高いときに動作モードを切り替え、送信側の起動電文を間欠的に送信することができるため、高負荷で送信頻度が高い場合に、送信側の無線機の消費電力を従来のものよりも低減させることができる。更に、低負荷の場合は従来どおり受信の消費電力を抑えた通信が可能となっており、通信区間の負荷に応じて通信システム全体の消費電力の最適化を図ることが可能である。 The embodiments of the wireless communication system of the present invention have been described in detail above.
According to the present invention, the operation mode can be switched when the load on the wireless communication section is high, and the transmission message on the transmission side can be transmitted intermittently. The power consumption of the machine can be reduced as compared with the conventional one. Furthermore, in the case of a low load, communication with reduced power consumption of reception is possible as usual, and it is possible to optimize the power consumption of the entire communication system according to the load of the communication section.

尚、上記の説明では、無線機の動作モード決定部５、動作モード制御部４が、それぞれ低負荷モード、高負荷モードのいずれかに、決定もしくはそのように動作変更するような機能を備えると説明したが、動作モードとして２つ以上のモードが存在しても構わないし、もしくは、動作モード決定部５が、最適な送信側の送信休止時間および受信側のキャリアセンス時間を算出し、動作モード制御部４が該決定した時間になるように無線通信動作を制御するような構成でも構わない。   In the above description, when the operation mode determination unit 5 and the operation mode control unit 4 of the wireless device have a function of determining or changing the operation to either the low load mode or the high load mode, respectively. As described above, there may be two or more modes as the operation mode, or the operation mode determination unit 5 calculates the optimal transmission pause time on the transmission side and the carrier sense time on the reception side, and the operation mode A configuration in which the control unit 4 controls the wireless communication operation so that the determined time is reached may be used.

また、図１では、負荷計測部６、動作モード決定部５、動作モード制御部４はＣＰＵ３の外部に存在するように示したが、それぞれプログラムで実現され、ＣＰＵ３上で実現する構成にしても構わない。   In FIG. 1, the load measurement unit 6, the operation mode determination unit 5, and the operation mode control unit 4 are shown to exist outside the CPU 3. However, the load measurement unit 6, the operation mode determination unit 5, and the operation mode control unit 4 are each realized by a program. I do not care.

すなわち、本発明は以上に述べた実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内で様々の構成または形状をとることができる。   That is, the present invention is not limited to the embodiments described above, and can take various configurations or shapes without departing from the gist of the present invention.

本発明の無線機の構成を示す図である。It is a figure which shows the structure of the radio | wireless machine of this invention. 低負荷の場合の通信を説明する図である。It is a figure explaining communication in the case of low load. 制御情報部のデータ構造を示す図である。It is a figure which shows the data structure of a control information part. 高負荷の場合の通信を説明する図である。It is a figure explaining communication in the case of high load. 負荷に基づき動作モードを変更するフローを示す図である。It is a figure which shows the flow which changes an operation mode based on load. 動作モードを変更する場合のシーケンスを示す図である。It is a figure which shows the sequence in the case of changing an operation mode.

符号の説明Explanation of symbols

１ 受信機
２ 送信機
３ ＣＰＵ
４ 動作モード制御部
５ 動作モード決定部
６ 負荷計測部
７ アンテナ
３０１ ビット同期
３０２ フレーム同期
３０３ 送信先ＩＤ
３０４ 受信先ＩＤ
３０５ 制御部通し番号 1 Receiver 2 Transmitter 3 CPU
4 Operation mode control unit 5 Operation mode determination unit 6 Load measurement unit 7 Antenna 301 Bit synchronization 302 Frame synchronization 303 Transmission destination ID
304 Recipient ID
305 Control unit serial number

Claims (11)

受信側無線機の受信機が間欠キャリアセンスする無線通信システムにおける送信側無線機であって、
パケットを送信する送信機と、
データ受信を行う受信機と、
自局が一定時間に前記送信機から送信するパケット数に基づいて、通信区間の負荷を計測する負荷計測手段と、
前記負荷計測手段の計測結果に基づいて、通信区間の負荷に応じて、前記受信側無線機の受信機のキャリアセンス間隔は同一で、該受信機のキャリアセンス時間および送信側無線機が送信する制御情報部の送信休止間隔がそれぞれ異なる二つ以上の動作モードのうちいずれかの動作モードで送信側無線機および受信側無線機を動作させるかを決定する動作モード決定手段と、
前記決定された動作モードに変更するように要求を相手局に前記送信機を介して送信し、前記受信機により相手局から応答を受信すると、自局の動作モードを変更する動作モード制御手段と、
を備えることを特徴とする無線機。 A receiver-side radio in a radio communication system in which the receiver of the receiver-side radio intermittently senses a carrier,
A transmitter for transmitting packets;
A receiver for receiving data;
Load measuring means for measuring the load of the communication section based on the number of packets transmitted from the transmitter at a given time by the own station;
Based on the measurement result of the load measuring means, the carrier sense interval of the receiver of the receiving radio is the same, and the carrier sense time of the receiver and the transmitting radio transmit according to the load of the communication section. An operation mode determination means for determining whether to operate the transmission side radio and the reception side radio in any one of two or more operation modes having different transmission pause intervals of the control information unit;
An operation mode control means for transmitting a request to the partner station via the transmitter to change to the determined operation mode and receiving a response from the partner station by the receiver; ,
A wireless device comprising: 受信側無線機の受信機が間欠キャリアセンスをする無線通信システムにおける受信側無線機であって、
パケットを送信する送信機と、
間欠的に駆動され、キャリアセンスまたはデータ受信を行う受信機と、
前記受信機により相手局から動作モード変更要求を受信すると、該要求に基づいて、前記受信機のキャリアセンス間隔は変えずに、キャリアセンス時間を変更するとともに、該相手局に応答を前記送信機を介して送信する動作モード制御手段と、
を備えることを特徴とする無線機。 The receiving side radio in the radio communication system in which the receiver of the receiving side radio performs intermittent carrier sense,
A transmitter for transmitting packets;
A receiver that is intermittently driven to perform carrier sense or data reception;
When the receiver receives an operation mode change request from the counterpart station, the carrier sense time is changed based on the request without changing the carrier sense interval of the receiver, and a response is sent to the counterpart station. An operation mode control means for transmitting via
A wireless device comprising: 請求項１または請求項２記載の無線機であって、
前記動作モードには、低負荷モードまたは高負荷モードがあり、
低負荷モードの場合、送信側無線機は起動電文を構成する制御情報部を、送信休止間隔０で連続的に送信し、受信側無線機はキャリアセンス間隔Ｔで、キャリアセンス時間が該制御情報部を送信するのにかかる時間の二倍以上になるように受信機を駆動してキャリアセンスを行い、
高負荷モードの場合、送信側無線機は起動電文を構成する制御情報部を、送信休止間隔Δｔで間欠的に送信し、受信側無線機はキャリアセンス間隔Ｔを保持したままキャリアセンス時間を（該制御情報部を送信するのにかかる時間の二倍＋Δｔ）以上になるように受信機を駆動してキャリアセンスを行う、
ことを特徴とする無線機。 The wireless device according to claim 1 or 2, wherein
The operation mode includes a low load mode or a high load mode,
In the case of the low load mode, the transmitting side radio continuously transmits the control information part constituting the startup message at the transmission pause interval 0, the receiving side radio is the carrier sense interval T, and the carrier sense time is the control information. Drive the receiver to perform carrier sense so that it takes more than twice the time it takes to transmit the part,
In the high load mode, the transmitting side radio transmits the control information part constituting the start message intermittently at the transmission pause interval Δt, and the receiving side radio sets the carrier sense time while maintaining the carrier sense interval T ( The receiver is driven so as to perform carrier sense so that the time required for transmitting the control information portion is double or more than Δt).
A wireless device characterized by that. 受信側無線機の受信機が間欠駆動する無線通信システムであって、
前記無線通信システムを構成する送信側無線機は、
パケットを送信する送信機と、
データ受信を行う受信機と、
自局が一定時間に前記送信機から送信するパケット数に基づいて、通信区間の負荷を計測する負荷計測手段と、
前記負荷計測手段の計測結果に基づいて、通信区間の負荷に応じて、前記受信側無線機の受信機のキャリアセンス間隔は同一で、該受信機のキャリアセンス時間および送信側無線機が送信する制御情報部の送信休止間隔がそれぞれ異なる二つ以上の動作モードのうちいずれかの動作モードで送信側無線機および受信側無線機を動作させるかを決定する動作モード決定手段と、
前記決定された動作モードに変更するように要求を相手局に前記送信機を介して送信し、前記受信機により相手局から応答を受信すると、自局の動作モードを変更する動作モード制御手段と、
を備え、
前記無線通信システムを構成する受信側無線機は、
パケットを送信する送信機と、
間欠的に駆動され、キャリアセンスまたはデータ受信を行う受信機と、
前記受信機により相手局から前記動作モード変更要求を受信すると、該要求に基づいて、前記受信機のキャリアセンス間隔は変えずに、キャリアセンス時間を変更するとともに、該相手局に応答を前記送信機を介して送信する動作モード制御手段と、
を備えることを特徴とする無線通信システム。 A wireless communication system in which a receiver of a reception-side wireless device is intermittently driven,
The transmitting side radio constituting the radio communication system is:
A transmitter for transmitting packets;
A receiver for receiving data;
Load measuring means for measuring the load of the communication section based on the number of packets transmitted from the transmitter at a given time by the own station;
Based on the measurement result of the load measuring means, the carrier sense interval of the receiver of the receiving radio is the same, and the carrier sense time of the receiver and the transmitting radio transmit according to the load of the communication section. An operation mode determination means for determining whether to operate the transmission side radio and the reception side radio in any one of two or more operation modes having different transmission pause intervals of the control information unit;
An operation mode control means for transmitting a request to the partner station via the transmitter to change to the determined operation mode and receiving a response from the partner station by the receiver; ,
With
The receiving side radio constituting the radio communication system is:
A transmitter for transmitting packets;
A receiver that is intermittently driven to perform carrier sense or data reception;
When the receiver receives the operation mode change request from the counterpart station, the carrier sense time is changed based on the request without changing the carrier sense interval of the receiver, and the response is sent to the counterpart station. Operation mode control means for transmitting via a machine;
A wireless communication system comprising: 受信動作を間欠的に行う無線通信方法であって、
キャリアセンスの起動間隔を保持したまま、受信側におけるキャリアセンス時間を変化させ、前記キャリアセンス時間の変化に応じて送信側ではパケットの送信時間を変化させることを特徴とする無線通信方法。 A wireless communication method for intermittently performing a receiving operation,
A wireless communication method, wherein a carrier sense time on a receiving side is changed while maintaining a carrier sense activation interval, and a packet transmission time is changed on a transmitting side according to the change in the carrier sense time. 請求項５記載の無線通信方法において、前記受信側を起動するために前記送信側から送られるパケットヘッダの情報を間欠的に送信することを特徴とする無線通信方法。   6. The wireless communication method according to claim 5, wherein information on a packet header sent from the transmission side is intermittently transmitted to activate the reception side. 請求項５記載の無線通信方法において、前記送信側と受信側との間の通信負荷に応じて前記キャリアセンス時間と前記パケットの送信時間を決定することを特徴とする無線通信方法。   6. The wireless communication method according to claim 5, wherein the carrier sense time and the packet transmission time are determined according to a communication load between the transmission side and the reception side. 受信側無線機の受信機が間欠キャリアセンスをする無線通信方法であって、
通信区間の負荷に応じて、受信側無線機の受信機のキャリアセンス間隔は変更せずに、キャリアセンス時間および、送信側無線機が送信する起動電文を構成する制御情報部を間欠的に送信するか否かを決定し、更に制御部情報を間欠的に送信する場合はその間隔を決定し、
前記決定されたキャリアセンス時間および制御部情報の間欠間隔になるように受信側および送信側無線機を動作制御する、
ことを特徴とする無線通信方法。 A wireless communication method in which a receiver of a receiving-side wireless device performs intermittent carrier sense,
Depending on the load of the communication section, the carrier sense interval of the receiver on the receiving side radio is not changed, and the control information part constituting the start message transmitted by the transmitting side radio is intermittently transmitted. Decide whether or not to further, and further determine the interval when transmitting the control unit information intermittently,
Control the operation of the receiving side and transmitting side radio so that the determined carrier sense time and the intermittent interval of the control unit information,
A wireless communication method. 受信側無線機の受信機が間欠キャリアセンスを行う無線通信方法であって、
前記無線通信を行う送信側の無線機は、
自局が一定時間に送信するパケット数に基づいて、通信区間の負荷を計測し、
前記計測された結果に基づいて、通信区間の負荷に応じて、前記受信側無線機の受信機のキャリアセンス間隔は同一で、該受信機のキャリアセンス時間および送信側無線機が送信する制御情報部の送信休止間隔がそれぞれ異なる二つ以上の動作モードのうちいずれかの動作モードで送信側無線機および受信側無線機を動作させるかを決定し、
前記決定された動作モードに変更するように要求を相手局に前記送信機を介して送信し、前記受信機のより相手局から応答を受信すると、自局の動作モードを変更し、
前記無線通信を行う受信側の無線機は、
前記受信機により相手局から前記動作モード変更要求を受信すると、該要求に基づいて、前記受信機のキャリアセンス間隔は変えずに、キャリアセンス時間を変更するとともに、該相手局に応答を送信機を介して送信する、
ことを特徴とする無線通信方法。 A wireless communication method in which a receiver of a receiving-side wireless device performs intermittent carrier sense,
The transmitter radio that performs the wireless communication is:
Based on the number of packets that your station sends in a certain time, measure the load of the communication section,
Based on the measured result, the carrier sense interval of the receiver of the receiving radio is the same according to the load of the communication section, the carrier sense time of the receiver and the control information transmitted by the transmitting radio Determine whether to operate the transmitting-side radio and the receiving-side radio in any one of two or more operation modes in which the transmission pause interval of each part is different,
Sending a request to the other station via the transmitter to change to the determined operation mode, and receiving a response from the other station from the receiver, changing the operation mode of the own station,
The receiving-side radio that performs the wireless communication is
When the receiver receives the operation mode change request from the partner station, the carrier sense time is changed based on the request without changing the carrier sense interval of the receiver, and a response is sent to the partner station. Send via
A wireless communication method. 受信側無線機の受信機が間欠キャリアセンスを行う無線通信システムにおける送信側の無線機に実行させるためのプログラムであって、
自局が一定時間に前記送信機から送信するパケット数に基づいて、通信区間の負荷を計測する機能と、
前記負荷計測手段の計測結果に基づいて、通信区間の負荷に応じて、前記受信側無線機の受信機のキャリアセンス間隔は同一で、該受信機のキャリアセンス時間および送信側無線機が送信する制御情報部の送信休止間隔がそれぞれ異なる二つ以上の動作モードのうちいずれかの動作モードで送信側無線機および受信側無線機を動作させるかを決定する機能と、
前記決定された動作モードに変更するように要求を相手局に前記送信機を介して送信し、受信機により相手局から応答を受信すると、自局の動作モードを変更する機能と、
を含んでなるプログラム。 A program for causing a transmitter on a transmitting side in a wireless communication system in which a receiver of a receiving-side wireless device performs intermittent carrier sensing,
A function of measuring the load of the communication section based on the number of packets that the local station transmits from the transmitter in a certain time;
Based on the measurement result of the load measuring means, the carrier sense interval of the receiver of the receiving radio is the same, and the carrier sense time of the receiver and the transmitting radio transmit according to the load of the communication section. A function for determining whether to operate the transmitting-side radio and the receiving-side radio in any one of two or more operation modes with different transmission pause intervals of the control information part;
A function to change the operation mode of the local station when a request is transmitted to the counterpart station via the transmitter to receive the response from the counterpart station by the receiver to change to the determined operation mode;
A program comprising 受信側無線機の受信機が間欠キャリアセンスを行う無線通信システムにおける受信側無線機に実行させるためのプログラムであって、
送信側無線機から送信される、通信区間の負荷に応じた無線機の動作変更情報に基づいて、キャリアセンス間隔は変更せずに、キャリアセンス時間を変更する機能と、
前記送信側無線機に、前記動作変更要求を受信し動作を変更したことを示す応答を送信する機能と、
を含んでなるプログラム。 A program for causing the receiver of the receiver-side radio to execute the receiver-side radio in the radio communication system in which intermittent carrier sense is performed,
A function of changing the carrier sense time without changing the carrier sense interval based on the operation change information of the radio according to the load of the communication section transmitted from the transmission side radio,
A function of transmitting a response indicating that the operation change request has been received and the operation has been changed to the transmitting-side radio;
A program comprising
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