JP5855551B2 - Wireless communication system and wireless communication method - Google Patents
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本発明は、ターゲットエリア内で同じ周波数リソースを共用する複数の無線ＬＡＮ規格の基地局と無線ＬＡＮ端末が、それぞれ無線ＬＡＮ規格に応じた優先度で無線通信を行う無線通信システムおよび無線通信方法に関する。ここで、同じ周波数リソースを共用する無線ＬＡＮ規格としては、例えばIEEE802.11ｂ、IEEE802.11ｇ、IEEE802.11ｎ等がある。 The present invention relates to a wireless communication system and a wireless communication method in which a plurality of wireless LAN standard base stations and wireless LAN terminals sharing the same frequency resource in a target area perform wireless communication with a priority according to the wireless LAN standard. . Here, as wireless LAN standards sharing the same frequency resource, for example, there are IEEE802.11b, IEEE802.11g, IEEE802.11n, and the like.
無線通信システムでは、無線ＬＡＮ規格の下位互換性を保ちつつより伝送速度が高い規格が標準化され、同じ周波数リソースを共用している。このような無線ＬＡＮ規格に準拠した無線ＬＡＮ端末に対して平等に無線通信を実現するＣＳＭＡ／ＣＡ（Carrier Sense Multiple Access with Collision Avoidance) 方式では、ＤＣＦ（Distributed Coordination Function ）送信方式が採用されている。各無線ＬＡＮ端末は、送信する前にチャネルのキャリアセンスを行い、チャネルがアイドルのときに、コンテンションウインドウ（ＣＷ）の範囲から乱数を発生させ、当該乱数に相当する期間（バックオフタイム）だけ待機して、チャネルがアイドルであることを再確認してパケットを送信する。バックオフタイム期間が経過する前にチャネルがビジーになった場合はパケットを送信せず、次にチャネルがアイドルになったときに、残りの待機時間によってキャリアセンスを行う。 In a wireless communication system, a standard having a higher transmission speed while maintaining backward compatibility with the wireless LAN standard is standardized and shares the same frequency resource. In the CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) method that realizes wireless communication evenly for such wireless LAN terminals compliant with the wireless LAN standard, a DCF (Distributed Coordination Function) transmission method is adopted. . Each wireless LAN terminal performs carrier sense of the channel before transmission, generates a random number from the contention window (CW) range when the channel is idle, and only a period (backoff time) corresponding to the random number. Wait, recheck that the channel is idle and send the packet. When the channel becomes busy before the back-off time period elapses, no packet is transmitted, and when the channel becomes idle next time, carrier sensing is performed according to the remaining waiting time.
一方、正常にパケットを受信した基地局は、その旨を送信元である無線ＬＡＮ端末に通知するために、ＡＣＫ信号を送信する。したがって、所定時間内にＡＣＫ信号を受信しない場合には、送信元である無線ＬＡＮ端末は、送信が失敗したと判断してＣＷを拡大することにより、乱数を発生させる範囲を広げて再送処理を行う。すなわち、再送回数が増えるごとにチャネルが混雑していると判断し、ＣＷを拡大することによって衝突回避を行う。 On the other hand, the base station that has received the packet normally transmits an ACK signal to notify the wireless LAN terminal that is the transmission source of the fact. Therefore, if the ACK signal is not received within a predetermined time, the wireless LAN terminal that is the transmission source determines that transmission has failed and expands the CW, thereby expanding the range for generating random numbers and performing retransmission processing. Do. That is, whenever the number of retransmissions increases, it is determined that the channel is congested, and collision avoidance is performed by expanding the CW.
しかし、無線ＬＡＮ通信では、無線局間の距離や電波を通さない障害物などの影響により、互いの無線信号が到達しない状態（キャリアセンスが機能しない電波環境）が起こりうる。この場合、キャリアセンスが有効に機能しないため、ＣＳＭＡ／ＣＡ方式ではフレームの衝突の頻度が増し、スループット特性を悪化させる原因になる。 However, in wireless LAN communication, a state in which the wireless signals do not reach each other (a radio wave environment in which carrier sense does not function) may occur due to the distance between radio stations or the influence of obstacles that do not transmit radio waves. In this case, since carrier sense does not function effectively, in the CSMA / CA system, the frequency of frame collision increases, which causes a deterioration in throughput characteristics.
そこで、無線ＬＡＮ規格ではキャリアセンスが有効に機能しない伝播環境に対応するために、ＲＴＳ（Request to Send ）／ＣＴＳ（Clear to Send ）と呼ばれる対策機能が定義されている。 Therefore, in the wireless LAN standard, a countermeasure function called RTS (Request to Send) / CTS (Clear to Send) is defined to cope with a propagation environment in which carrier sense does not function effectively.
図４は、ＲＴＳ／ＣＴＳの動作手順を示す。
図４において、端末Ａはデータフレーム送信前にＤＩＦＳに加えてバックオフ時間をキャリアセンスし、ＲＴＳをデータフレームの宛先である基地局宛に送信する。端末Ａと端末Ｂは互いにキャリアセンスできる伝播環境下にあるため、端末Ａが送信するＲＴＳを端末Ｂも受信する。ＲＴＳとＣＴＳのフレームには、チャネルを使用する予約期間が記載されるデュレーションフィールドがあり、端末ＢはＲＴＳフレームの予約信号が設定するＮＡＶ（Network Allocation Vector)期間だけ送信を禁止して衝突を防止する。ただし、このＲＴＳは端末Ｃには届かないものとする。
FIG. 4 shows an operation procedure of RTS / CTS.
In FIG. 4, before transmitting a data frame, terminal A carries out carrier sense of the backoff time in addition to DIFS, and transmits RTS to the base station that is the destination of the data frame. Since the terminal A and the terminal B are in a propagation environment where carrier sense can be performed, the terminal B also receives the RTS transmitted by the terminal A. The RTS and CTS frames have a duration field in which the reservation period for using the channel is described. The terminal B prohibits transmission only during the NAV (Network Allocation Vector) period set by the reservation signal of the RTS frame to prevent collision. To do. However, it is assumed that this RTS does not reach the terminal C.
データフレームの宛先である基地局は、ＲＴＳ受信後のＳＩＦＳ時間空けて端末Ａ宛にＣＴＳを返す。基地局が送信したＣＴＳは端末Ｃも受信することができるので、端末ＣはＣＴＳフレームの予約信号が設定するＮＡＶ期間だけ送信を禁止して衝突を防止する。ＣＴＳを受信した端末Ａは、ＳＩＦＳ時間後にデータフレームを送信し、当該データフレームを受信した基地局もＳＩＦＳ時間後にＡＣＫ信号を送信して通信を終了する。ここで、ＳＩＦＳとＤＩＦＳは、ＳＩＦＳ＜ＤＩＦＳの関係にあるため、短い時間のＳＩＦＳを使って優先権をもたせることで、いったんＲＴＳが正常に受信されれば、以後の手順中はフレームは妨害されることなくデータフレームとＡＣＫ信号が交換される。 The base station that is the destination of the data frame returns a CTS to terminal A after a SIFS time interval after receiving the RTS. Since the CTS transmitted by the base station can also be received by the terminal C, the terminal C prohibits transmission for the NAV period set by the reservation signal of the CTS frame to prevent collision. The terminal A that has received the CTS transmits a data frame after the SIFS time, and the base station that has received the data frame also transmits an ACK signal after the SIFS time and ends the communication. Here, since SIFS and DIFS have a relationship of SIFS <DIFS, by giving priority using SIFS for a short time, once RTS is normally received, the frame is disturbed during the subsequent procedure. The data frame and the ACK signal are exchanged without any change.
データフレームの送信元の端末Ａ、受信先の基地局以外の周辺無線局（端末Ｂ，端末Ｃ）は、ＲＴＳあるいはＣＴＳの受信後、デュレーションフィールドに記載されている期間は無線回線が使用されていると見なし、予約信号が設定するＮＡＶ期間だけ送信を禁止して衝突を防止する。 The terminal A that is the transmission source of the data frame and the peripheral radio stations (terminal B and terminal C) other than the base station that is the reception destination use the radio line for the period described in the duration field after receiving the RTS or CTS. Therefore, transmission is prohibited during the NAV period set by the reservation signal to prevent a collision.
昨今の無線通信システムは、ターゲットエリア内に様々な無線ＬＡＮ規格の基地局および無線ＬＡＮ端末が多数存在して稠密になってきており、特に同一の周波数リソースを共用する場合にはフレーム衝突の頻度が増してスループット特性が著しく劣化することになる。一方、既存のアクセス方式（ＣＳＭＡ／ＣＡ）では、様々な無線ＬＡＮ規格に平等であるため、無線ＬＡＮ規格ごとのＱｏＳ制御を行うことができなかった。 In recent wireless communication systems, a large number of base stations and wireless LAN terminals of various wireless LAN standards exist in a target area and become denser. In particular, when the same frequency resource is shared, the frequency of frame collisions As a result, throughput characteristics are significantly degraded. On the other hand, since the existing access method (CSMA / CA) is equal to various wireless LAN standards, QoS control for each wireless LAN standard cannot be performed.
本発明は、同一の周波数リソースを共用する複数の無線ＬＡＮ規格の基地局および無線ＬＡＮ端末が存在するターゲットエリア内において、無線ＬＡＮ規格ごとに優先度およびチャネル利用率を設定してＱｏＳ制御を行うことができる無線通信システムおよび無線通信方法を提供することを目的とする。 The present invention performs QoS control by setting priority and channel utilization for each wireless LAN standard within a target area where a plurality of wireless LAN standard base stations and wireless LAN terminals sharing the same frequency resource exist. An object of the present invention is to provide a wireless communication system and a wireless communication method.
第１の発明は、複数の基地局と無線ＬＡＮ端末が同一の周波数リソースを共用し、各基地局がそれぞれ使用する無線ＬＡＮ規格に対応する無線ＬＡＮ端末と無線通信を行う無線通信システムにおいて、一の無線ＬＡＮ規格の基地局は、他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末に対して、該一の無線ＬＡＮ規格に応じた優先度およびチャネル利用率に基づくＮＡＶ期間を指定してチャネルを予約する予約信号を送信する手段を備え、予約信号を送信した基地局は、予約信号で指定したＮＡＶ期間に、一の無線ＬＡＮ規格に対応する無線ＬＡＮ端末と無線通信を行い、他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末は、予約信号を受信し、予約信号で指定されたＮＡＶ期間だけ送信を禁止する。 A first aspect of the present invention is a plurality of base stations and the wireless LAN terminal to share the same frequency resources in a wireless communication system that performs wireless LAN terminal and the wireless communication corresponding to the wireless LAN standard in which each base station uses each one The base station of the wireless LAN standard designates the NAV period based on the priority and the channel utilization rate according to the one wireless LAN standard for the base station and the wireless LAN terminal that perform wireless communication with another wireless LAN standard. And a base station that has transmitted the reservation signal performs wireless communication with a wireless LAN terminal corresponding to one wireless LAN standard during the NAV period specified by the reservation signal , Base stations and wireless LAN terminals that perform wireless communication according to other wireless LAN standards receive the reservation signal and prohibit transmission during the NAV period specified by the reservation signal.
第１の発明の無線通信システムにおいて、予約信号は、各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した長さのＮＡＶ期間が設定される。 In the wireless communication system of the first invention, the reservation signal is set with a NAV period having a length corresponding to the priority and channel utilization rate for each wireless LAN standard.
第１の発明の無線通信システムにおいて、予約信号は、各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した送信割合で送信される。 In the wireless communication system of the first invention, the reservation signal is transmitted at a transmission rate corresponding to the priority and channel utilization rate for each wireless LAN standard.
第１の発明の無線通信システムにおいて、各無線ＬＡＮ規格の基地局は、互いにサポートする無線ＬＡＮ規格を通知する報知信号を送受信し、自基地局がサポートする無線ＬＡＮ規格に応じた優先度およびチャネル利用率を設定する構成である。 In the wireless communication system of the first invention, each base station of each wireless LAN standard transmits and receives a notification signal for reporting the wireless LAN standard supported by each other, and the priority and channel according to the wireless LAN standard supported by the base station This is a configuration for setting the utilization rate.
第２の発明は、複数の基地局と無線ＬＡＮ端末が同一の周波数リソースを共用し、各基地局がそれぞれ使用する無線ＬＡＮ規格に対応する無線ＬＡＮ端末と無線通信を行う無線通信方法において、一の無線ＬＡＮ規格の基地局は、他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末に対して、該一の無線ＬＡＮ規格に応じた優先度およびチャネル利用率に基づくＮＡＶ期間を指定してチャネルを予約する予約信号を送信し、予約信号を送信した基地局は、予約信号で指定したＮＡＶ期間に、一の無線ＬＡＮ規格に対応する無線ＬＡＮ端末と無線通信を行い、他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末は、予約信号を受信し、予約信号で指定されたＮＡＶ期間だけ送信を禁止する。
A second invention is, a plurality of base stations and the wireless LAN terminal to share the same frequency resources in a wireless communication method for performing wireless LAN terminal and the wireless communication corresponding to the wireless LAN standard in which each base station uses each one The base station of the wireless LAN standard designates the NAV period based on the priority and the channel utilization rate according to the one wireless LAN standard for the base station and the wireless LAN terminal that perform wireless communication with another wireless LAN standard. Then, the base station that has transmitted the reservation signal for reserving the channel performs wireless communication with the wireless LAN terminal corresponding to one wireless LAN standard during the NAV period specified by the reservation signal, and transmits the other wireless signal. A base station and a wireless LAN terminal that perform wireless communication in accordance with the LAN standard receive a reservation signal and prohibit transmission during the NAV period designated by the reservation signal.
第２の発明の無線通信方法において、予約信号は、各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した長さのＮＡＶ期間が設定される。 In the wireless communication method of the second invention, the reservation signal is set with a NAV period having a length corresponding to the priority and channel utilization factor for each wireless LAN standard.
第２の発明の無線通信方法において、予約信号は、各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した送信割合で送信される。 In the wireless communication method of the second invention, the reservation signal is transmitted at a transmission rate corresponding to the priority and channel utilization rate for each wireless LAN standard.
第２の発明の無線通信方法において、各無線ＬＡＮ規格の基地局は、互いにサポートする無線ＬＡＮ規格を通知する報知信号を送受信し、自基地局がサポートする無線ＬＡＮ規格に応じた優先度およびチャネル利用率を設定する。 In the wireless communication method of the second invention, the base stations of each wireless LAN standard transmit and receive a notification signal for notifying the wireless LAN standard supported by each other, and the priority and channel according to the wireless LAN standard supported by the base station Set the usage rate.
本発明は、各無線ＬＡＮ規格ごとに設定された優先度およびチャネル利用率に対応してＮＡＶ期間を指定した予約信号を用いることにより、無線ＬＡＮ規格ごとにＮＡＶ期間に応じた優先的送信と送信禁止が制御される。これにより、無線ＬＡＮ規格ごとのＱｏＳ制御が可能となり、良好な通信環境の実現およびスループットの改善を図ることができる。 The present invention uses a reservation signal in which a NAV period is designated corresponding to the priority and channel utilization rate set for each wireless LAN standard, so that priority transmission and transmission according to the NAV period for each wireless LAN standard are performed. Prohibition is controlled. As a result, QoS control for each wireless LAN standard becomes possible, and a good communication environment can be realized and throughput can be improved.
本発明における無線通信システムは、複数の基地局および無線ＬＡＮ端末で構成される。各基地局がサポートする無線ＬＡＮ規格はそれぞれ１つに限定され、ここでは同一の周波数リソースを共用するIEEE802.11ｂ、IEEE802.11ｇ、IEEE802.11ｎのいずれかとして説明する。各無線ＬＡＮ規格に対応する無線ＬＡＮ端末は、それぞれ同一の無線ＬＡＮ規格をサポートする基地局と通信する。 The wireless communication system according to the present invention includes a plurality of base stations and wireless LAN terminals. Each base station supports only one wireless LAN standard, and here, it will be described as any one of IEEE802.11b, IEEE802.11g, and IEEE802.11n sharing the same frequency resource. Each wireless LAN terminal corresponding to each wireless LAN standard communicates with a base station that supports the same wireless LAN standard.
図１は、本発明の無線通信システムにおける基地局の構成例を示す。
図１において、基地局は、データ信号入出力部１、報知信号生成部２、予約信号生成部３、無線ＬＡＮ規格制御部４、送受信制御部５およびアンテナ６を備える。データ信号入出力部１、報知信号生成部２および予約信号生成部３は、無線ＬＡＮ規格制御部４を介して送受信制御部５に接続される。
FIG. 1 shows a configuration example of a base station in a wireless communication system of the present invention.
In FIG. 1, the base station includes a data signal input / output unit 1, a broadcast
データ信号入出力部１は、サポートする無線ＬＡＮ規格に応じて送受信されるデータ信号の入出力処理を行う。報知信号生成部２は、サポートする無線ＬＡＮ規格に関する情報を通知する報知信号の生成処理を行う。予約信号生成部３は、チャネルを予約する予約信号（ＮＡＶ）の生成処理を行う。送受信制御部５は、アンテナ６を介して報知信号、予約信号およびデータ信号の送受信処理を行う。なお、報知信号および予約信号は、各基地局がサポートする無線ＬＡＮ規格に拘らず互いに送受信できる信号とする。
The data signal input / output unit 1 performs input / output processing of data signals transmitted and received according to the supported wireless LAN standard. The notification
無線ＬＡＮ規格制御部４は、図２に示すように、各基地局から報知信号で通知されたそれぞれの無線ＬＡＮ規格を認識し、自基地局がサポートする無線ＬＡＮ規格に応じた優先度およびチャネル利用率を設定し、優先度およびチャネル利用率に基づく予約信号およびデータ信号の送受信制御を行う。なお、本実施例では、チャネル利用率に応じた長さのＮＡＶ期間が予約信号に設定されるものとする。例えば、優先度の高い無線ＬＡＮ規格から順番にIEEE802.11ｎ、IEEE802.11ｇ、IEEE802.11ｂとしたとき、それぞれのチャネル利用率として、IEEE802.11ｎでは４回分のデータ信号の送受信ができ、IEEE802.11ｇでは２回分のデータ信号の送受信ができ、IEEE802.11ｂでは１回分のデータ信号の送受信ができるＮＡＶ期間が設定されるものとする。 As shown in FIG. 2, the wireless LAN standard control unit 4 recognizes each wireless LAN standard notified from each base station by a broadcast signal, and priorities and channels according to the wireless LAN standard supported by the base station. A utilization rate is set, and transmission / reception control of a reservation signal and a data signal based on the priority and the channel utilization rate is performed. In this embodiment, it is assumed that the NAV period having a length corresponding to the channel utilization rate is set as the reserved signal. For example, when IEEE802.11n, IEEE802.11g, and IEEE802.11b are set in order from the wireless LAN standard with the highest priority, IEEE802.11n can transmit and receive data signals for four times, and IEEE802.11n. In 11g, a data signal can be transmitted and received twice, and in IEEE802.11b, a NAV period in which data signal can be transmitted and received once is set.
図３は、本発明の無線通信システムの動作例を示す。
図３において、無線ＬＡＮ規格IEEE802.11ｎの基地局１０、無線ＬＡＮ規格IEEE802.11ｇの基地局２０、無線ＬＡＮ規格IEEE802.11ｂの基地局３０は、それぞれサポートする無線ＬＡＮ規格に関する情報を通知する報知信号を定期的に送信する。各基地局は、互いに報知信号で通知されたそれぞれの無線ＬＡＮ規格を認識し、自基地局がサポートする無線ＬＡＮ規格に応じた優先度およびチャネル利用率に対応するＮＡＶ期間を設定する。
FIG. 3 shows an operation example of the wireless communication system of the present invention.
In FIG. 3, the base station 10 of the wireless LAN standard IEEE802.11n, the base station 20 of the wireless LAN standard IEEE802.11g, and the base station 30 of the wireless LAN standard IEEE802.11b each notify information related to the supported wireless LAN standard. Send a signal periodically. Each base station recognizes each wireless LAN standard notified by the broadcast signal, and sets a priority and a NAV period corresponding to the channel utilization rate according to the wireless LAN standard supported by the base station.
一方、無線ＬＡＮ端末は報知信号により各基地局がサポートする無線ＬＡＮ規格を認識することにより、自端末の無線ＬＡＮ規格と一致する基地局を認識し、通信を行う基地局を特定する。ここでは、基地局１０と無線ＬＡＮ端末１１，１２が無線ＬＡＮ規格IEEE802.11ｎで通信し、基地局２０と無線ＬＡＮ端末２１，２２が無線ＬＡＮ規格IEEE802.11ｇで通信し、基地局３０と無線ＬＡＮ端末３１が無線ＬＡＮ規格IEEE802.11ｇで通信する。 On the other hand, the wireless LAN terminal recognizes the wireless LAN standard supported by each base station from the notification signal, thereby recognizing the base station that matches the wireless LAN standard of the terminal itself and specifying the base station that performs communication. Here, the base station 10 and the wireless LAN terminals 11 and 12 communicate with the wireless LAN standard IEEE802.11n, the base station 20 and the wireless LAN terminals 21 and 22 communicate with the wireless LAN standard IEEE802.11g, and the base station 30 wirelessly. The LAN terminal 31 communicates with the wireless LAN standard IEEE802.11g.
まず、第１優先度の無線ＬＡＮ規格IEEE802.11ｎの基地局１０は、４回分のデータ信号を送受信するＮＡＶ期間を設定した予約信号を送信する。この予約信号は、他の無線ＬＡＮ規格の基地局２０および無線ＬＡＮ端末２１，２２、基地局３０および無線ＬＡＮ端末３１にも受信され、当該基地局２０，３０および無線ＬＡＮ端末２１，２２，３１では当該予約信号によるＮＡＶ期間の送信が禁止される。 First, the base station 10 of the first priority wireless LAN standard IEEE802.11n transmits a reservation signal in which a NAV period for transmitting and receiving data signals for four times is set. The reservation signal is also received by the base station 20 and the wireless LAN terminals 21 and 22, the base station 30 and the wireless LAN terminal 31 of other wireless LAN standards, and the base stations 20 and 30 and the wireless LAN terminals 21, 22 and 31 are received. Then, transmission of the NAV period by the reservation signal is prohibited.
一方、基地局１０の配下の無線ＬＡＮ端末１１，１２は、基地局１０が送信する予約信号を無視する。すなわち、予約信号によるＮＡＶ期間は、他の無線ＬＡＮ規格の基地局２０および無線ＬＡＮ端末２１，２２と、基地局３０および無線ＬＡＮ端末３１に設定され、当該無線ＬＡＮ規格IEEE802.11ｎの基地局１０と無線ＬＡＮ端末１１，１２との間で４回分のデータ信号を優先的に送受信することができる。なお、図３では、ＤＩＦＳ、ＳＩＦＳ、バックオフ、ＡＣＫ等は省略し、データ信号のみを表示している。以下同様である。 On the other hand, the wireless LAN terminals 11 and 12 under the base station 10 ignore the reservation signal transmitted by the base station 10. That is, the NAV period by the reservation signal is set in the base station 20 and the wireless LAN terminals 21 and 22 of other wireless LAN standards, the base station 30 and the wireless LAN terminal 31, and the base station 10 of the wireless LAN standard IEEE802.11n. 4 data signals can be preferentially transmitted and received between the wireless LAN terminals 11 and 12. In FIG. 3, DIFS, SIFS, back-off, ACK, etc. are omitted, and only the data signal is displayed. The same applies hereinafter.
次に、基地局１０により設定されたＮＡＶ期間が終了すると、第２優先度の無線ＬＡＮ規格IEEE802.11ｇの基地局２０は、３回分のデータ信号を送受信するＮＡＶ期間を設定した予約信号を送信する。この予約信号は、他の無線ＬＡＮ規格の基地局１０および無線ＬＡＮ端末１１，１２、基地局３０および無線ＬＡＮ端末３１にも受信され、当該基地局１０，３０および無線ＬＡＮ端末１１，１２，３１では当該予約信号によるＮＡＶ期間の送信が禁止される。 Next, when the NAV period set by the base station 10 ends, the base station 20 of the second priority wireless LAN standard IEEE802.11g transmits a reservation signal in which the NAV period for transmitting and receiving three data signals is set. To do. This reservation signal is also received by the base station 10 and the wireless LAN terminals 11 and 12, the base station 30 and the wireless LAN terminal 31 of other wireless LAN standards, and the base stations 10 and 30 and the wireless LAN terminals 11, 12, 31. Then, transmission of the NAV period by the reservation signal is prohibited.
一方、基地局２０の配下の無線ＬＡＮ端末２１，２２は、基地局２０が送信する予約信号を無視する。すなわち、予約信号によるＮＡＶ期間は、他の無線ＬＡＮ規格の基地局１０および無線ＬＡＮ端末１１，１２と、基地局３０および無線ＬＡＮ端末３１に設定され、当該無線ＬＡＮ規格IEEE802.11ｇの基地局２０と無線ＬＡＮ端末２１，２２との間で３回分のデータ信号を優先的に送受信することができる。 On the other hand, the wireless LAN terminals 21 and 22 under the base station 20 ignore the reservation signal transmitted by the base station 20. That is, the NAV period by the reservation signal is set in the base station 10 and the wireless LAN terminals 11 and 12 of other wireless LAN standards, the base station 30 and the wireless LAN terminal 31, and the base station 20 of the wireless LAN standard IEEE802.11g. And wireless LAN terminals 21 and 22 can preferentially transmit and receive data signals for three times.
次に、基地局２０により設定されたＮＡＶ期間が終了すると、第３優先度の無線ＬＡＮ規格IEEE802.11ｂの基地局３０は、１回分のデータ信号を送受信するＮＡＶ期間を設定した予約信号を送信する。この予約信号は、他の無線ＬＡＮ規格の基地局１０および無線ＬＡＮ端末１１，１２、基地局２０および無線ＬＡＮ端末２１，２２にも受信され、当該基地局１０，２０および無線ＬＡＮ端末１１，１２，２１，２２では当該予約信号によるＮＡＶ期間の送信が禁止される。 Next, when the NAV period set by the base station 20 ends, the base station 30 of the third priority wireless LAN standard IEEE802.11b transmits a reservation signal in which the NAV period for transmitting and receiving one data signal is set. To do. The reservation signal is also received by the base station 10 and the wireless LAN terminals 11 and 12 of the other wireless LAN standards, the base station 20 and the wireless LAN terminals 21 and 22, and the base stations 10 and 20 and the wireless LAN terminals 11 and 12 are received. , 21 and 22 prohibit transmission of the NAV period by the reservation signal.
一方、基地局３０の配下の無線ＬＡＮ端末３１は、基地局３０が送信する予約信号を無視する。すなわち、予約信号によるＮＡＶ期間は、他の無線ＬＡＮ規格の基地局１０および無線ＬＡＮ端末１１，１２と、基地局２０および無線ＬＡＮ端末２１，２２に設定され、当該無線ＬＡＮ規格IEEE802.11ｂの基地局３０と無線ＬＡＮ端末３１との間で１回分のデータ信号を優先的に送受信することができる。 On the other hand, the wireless LAN terminal 31 under the base station 30 ignores the reservation signal transmitted by the base station 30. That is, the NAV period by the reservation signal is set in the base station 10 and the wireless LAN terminals 11 and 12 of the other wireless LAN standards and the base station 20 and the wireless LAN terminals 21 and 22, and the base of the wireless LAN standard IEEE802.11b is set. A data signal for one time can be preferentially transmitted and received between the station 30 and the wireless LAN terminal 31.
以下同様に、基地局１０，２０，３０の優先度の順番に予約信号の送信を繰り返し、無線ＬＡＮ規格ごとにそれぞれ設定するＮＡＶ期間で優先的にデータ信号を送受信することができる。 Similarly, the reservation signals are repeatedly transmitted in the order of priority of the base stations 10, 20, and 30, and data signals can be transmitted and received preferentially during the NAV period set for each wireless LAN standard.
なお、以上説明した実施例では、無線ＬＡＮ規格に応じた優先度およびチャネル利用率としてＮＡＶ期間の長さを設定する例を示したが、例えば１つの予約信号で設定するＮＡＶ期間を一定とし、予約信号の送信割合を無線ＬＡＮ規格に応じた優先度およびチャネル利用率に対応するように設定してもよい。 In the embodiment described above, the example in which the length of the NAV period is set as the priority and the channel usage rate according to the wireless LAN standard has been shown. However, for example, the NAV period set by one reservation signal is constant, The transmission ratio of the reservation signal may be set so as to correspond to the priority and the channel usage rate according to the wireless LAN standard.
１ データ信号入出力部
２ 報知信号生成部
３ 予約信号生成部
４ 無線ＬＡＮ規格制御部
５ 送受信部
６ アンテナ
１０，２０，３０ 基地局
１１，１２，２１，２２，３１ 無線ＬＡＮ端末
DESCRIPTION OF SYMBOLS 1 Data signal input /
Claims (8)
一の無線ＬＡＮ規格の基地局は、他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末に対して、該一の無線ＬＡＮ規格に応じた優先度およびチャネル利用率に基づくＮＡＶ期間を指定してチャネルを予約する予約信号を送信する手段を備え、
前記予約信号を送信した基地局は、前記予約信号で指定したＮＡＶ期間に、前記一の無線ＬＡＮ規格に対応する無線ＬＡＮ端末と無線通信を行い、
前記他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末は、前記予約信号を受信し、前記予約信号で指定されたＮＡＶ期間だけ送信を禁止する
ことを特徴とする無線通信システム。 In a wireless communication system in which a plurality of base stations and a wireless LAN terminal share the same frequency resource, and wireless communication is performed with a wireless LAN terminal corresponding to the wireless LAN standard used by each base station ,
A base station of one wireless LAN standard has a NAV period based on a priority and a channel utilization rate according to the one wireless LAN standard, with respect to a base station and a wireless LAN terminal that perform wireless communication with another wireless LAN standard. A means for transmitting a reservation signal for specifying and reserving a channel ;
The base station that has transmitted the reservation signal performs wireless communication with a wireless LAN terminal corresponding to the one wireless LAN standard during the NAV period specified by the reservation signal ,
A base station and a wireless LAN terminal that perform wireless communication according to the other wireless LAN standards receive the reservation signal and prohibit transmission during the NAV period specified by the reservation signal.
前記予約信号は、前記各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した長さのＮＡＶ期間が設定される
ことを特徴とする無線通信システム。 The wireless communication system according to claim 1, wherein
The reservation signal is set with a NAV period having a length corresponding to a priority and a channel usage rate for each wireless LAN standard.
前記予約信号は、前記各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した送信割合で送信される
ことを特徴とする無線通信システム。 The wireless communication system according to claim 1, wherein
The wireless communication system, wherein the reservation signal is transmitted at a transmission rate corresponding to a priority and a channel usage rate for each wireless LAN standard.
前記各無線ＬＡＮ規格の基地局は、互いにサポートする無線ＬＡＮ規格を通知する報知信号を送受信し、自基地局がサポートする無線ＬＡＮ規格に応じた優先度およびチャネル利用率を設定する構成である
ことを特徴とする無線通信システム。 The wireless communication system according to claim 1, wherein
Each of the wireless LAN standard base stations is configured to transmit and receive a notification signal for notifying each other of the wireless LAN standards supported by each other, and to set a priority and a channel usage rate according to the wireless LAN standard supported by the base station. A wireless communication system.
一の無線ＬＡＮ規格の基地局は、他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末に対して、該一の無線ＬＡＮ規格に応じた優先度およびチャネル利用率に基づくＮＡＶ期間を指定してチャネルを予約する予約信号を送信し、
前記予約信号を送信した基地局は、前記予約信号で指定したＮＡＶ期間に、前記一の無線ＬＡＮ規格に対応する無線ＬＡＮ端末と無線通信を行い、
前記他の無線ＬＡＮ規格で無線通信を行う基地局および無線ＬＡＮ端末は、前記予約信号を受信し、前記予約信号で指定されたＮＡＶ期間だけ送信を禁止する
ことを特徴とする無線通信方法。 In a wireless communication method in which a plurality of base stations and wireless LAN terminals share the same frequency resource and wireless communication is performed with wireless LAN terminals corresponding to wireless LAN standards used by each base station ,
A base station of one wireless LAN standard has a NAV period based on a priority and a channel utilization rate according to the one wireless LAN standard, with respect to a base station and a wireless LAN terminal that perform wireless communication with another wireless LAN standard. Send a reservation signal to reserve the channel by specifying ,
The base station that has transmitted the reservation signal performs wireless communication with a wireless LAN terminal corresponding to the one wireless LAN standard during the NAV period specified by the reservation signal ,
A base station and a wireless LAN terminal that perform wireless communication in accordance with the other wireless LAN standard receive the reservation signal and prohibit transmission during a NAV period specified by the reservation signal.
前記予約信号は、前記各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した長さのＮＡＶ期間が設定される
ことを特徴とする無線通信方法。 The wireless communication method according to claim 5, wherein
The reservation signal is set with a NAV period having a length corresponding to the priority and channel utilization rate for each wireless LAN standard.
前記予約信号は、前記各無線ＬＡＮ規格ごとの優先度およびチャネル利用率に対応した送信割合で送信される
ことを特徴とする無線通信方法。 The wireless communication method according to claim 5, wherein
The wireless communication method, wherein the reservation signal is transmitted at a transmission rate corresponding to a priority and a channel usage rate for each wireless LAN standard.
前記各無線ＬＡＮ規格の基地局は、互いにサポートする無線ＬＡＮ規格を通知する報知信号を送受信し、自基地局がサポートする無線ＬＡＮ規格に応じた優先度およびチャネル利用率を設定する
ことを特徴とする無線通信方法。 The wireless communication method according to claim 5, wherein
Each of the wireless LAN standard base stations transmits and receives a notification signal for reporting a wireless LAN standard supported by each other, and sets a priority and a channel usage rate according to the wireless LAN standard supported by the base station. Wireless communication method.
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