JP2007166373A - Wireless communication method - Google Patents

Wireless communication method Download PDF

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JP2007166373A
JP2007166373A JP2005361572A JP2005361572A JP2007166373A JP 2007166373 A JP2007166373 A JP 2007166373A JP 2005361572 A JP2005361572 A JP 2005361572A JP 2005361572 A JP2005361572 A JP 2005361572A JP 2007166373 A JP2007166373 A JP 2007166373A
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station
transmission
packet
received
control signal
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Tsutomu Mukai
務 向井
Yoshio Urabe
嘉夫 浦部
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To allow transmitting stations and receiving stations to determine whether simultaneous transmission is possible, in the location topology of all wireless stations. <P>SOLUTION: In this wireless communication method, the interference power information and the received power information of a control signal from a communication partner are added to RTS105, 107/CTS106, 108 packet. A wireless station which has received the RTS/CTS packet calculates a required signal to interference signal power ratio based on the received power of the RTS/CTS packet to determine whether simultaneous transmission is possible or not. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、複数のリンクが共存する無線通信システムにおいて、複数のリンクを同時に伝送することで高い空間利用効率を実現できる無線通信方法に関する。   The present invention relates to a wireless communication method capable of realizing high space utilization efficiency by simultaneously transmitting a plurality of links in a wireless communication system in which a plurality of links coexist.

従来、無線ＬＡＮなどのパケット無線伝送を行う無線通信システムにおいては、キャリアセンスに基づくアクセス制御方式が広く用いられている。例えば非特許文献１では、受信信号強度に基づくキャリアセンスに加えて、データ送信要求（ＲＴＳ）、受信準備完了（ＣＴＳ）制御パケットを用いるＣＳＭＡ／ＣＡ方式が記載されている。ＲＴＳおよびＣＴＳのフレームには、無線回線を使用する予定期間が記載されており、通信相手以外のＲＴＳおよびＣＴＳを受信した無線局はこの期間送信を禁止することによって、パケットの衝突を防止する。これを仮想キャリアセンスと呼ぶ。ＲＴＳ／ＣＴＳを用いることによって、受信局が送信するＣＴＳを受信できれば送信局の存在を知ることができるため、互いのキャリアを認識することが出来ない送信局が同一の受信局へパケットを送信し、パケット衝突を起こす隠れ端末問題を解決することができる。このようにＲＴＳ／ＣＴＳは隠れ端末問題によるパケット衝突を回避することを目的としたものである。しかし、ＲＴＳ／ＣＴＳを受信した無線局はＲＴＳ／ＣＴＳの受信電力が、たとえ目的の通信に影響を与えないような弱い受信信号強度であったとしても送信を行わない、いわゆるさらされ端末問題が生じるため、システム全体としての伝送容量が制限されるという課題があった。   Conventionally, in a wireless communication system that performs packet wireless transmission such as a wireless LAN, an access control method based on carrier sense has been widely used. For example, Non-Patent Document 1 describes a CSMA / CA scheme that uses a data transmission request (RTS) and a reception ready (CTS) control packet in addition to carrier sense based on received signal strength. The RTS and CTS frames describe the scheduled period for using the radio line, and radio stations that have received RTS and CTS other than the communication partner prohibit transmission during this period, thereby preventing packet collisions. This is called virtual carrier sense. By using RTS / CTS, if the CTS transmitted by the receiving station can be received, the existence of the transmitting station can be known, so that the transmitting stations that cannot recognize each other's carriers transmit packets to the same receiving station. The hidden terminal problem causing packet collision can be solved. Thus, RTS / CTS is intended to avoid packet collision due to the hidden terminal problem. However, a radio station that has received RTS / CTS does not transmit even if the received power of RTS / CTS is such a weak received signal strength that does not affect the target communication, so-called exposed terminal problem occurs. As a result, the transmission capacity of the entire system is limited.

非特許文献１は上記問題に対する対策として、ＣＴＳを受信した送信端末は必ずしも送信を中止するのではなく、特定の条件を満たせば同時送信を行うことによって、システム全体としての伝送容量を向上させている。図１６に非特許文献１の概念図を示す。今、ａ１０１がａ１０２にデータを送信しているとする。ａ１０１はデータの送信前にａ１０２へＲＴＳを送信し、ａ１０２はａ１０１へＣＴＳを送信する。ここでａ１０２はＣＴＳパケットにＲＴＳパケットの受信電力情報とａ１０２の干渉電力情報を付加する。ａ１０３はＣＴＳを受信すると、ＣＴＳパケットを参照し、さらにＣＴＳパケットの受信電力情報を測定する。ａ１０３は、ａ１０１とａ１０３が等電力で送信を行うならば、ａ１０３がデータを送信すると、ＣＴＳパケットの受信電力の分だけ、ａ１０２の干渉電力が増加すると推定する。ａ１０３は自身が送信した場合のａ１０２の所望信号電力と、干渉となる信号電力の比（ＳＩＮＲ）を計算し、ａ１０３が送信してもａ１０２の受信に影響を与えないと判断すれば、ａ１０４へＲＴＳの送信を行う。   Non-Patent Document 1 improves the transmission capacity of the entire system as a countermeasure against the above-mentioned problem, by not simultaneously stopping the transmission terminal that received the CTS, but performing simultaneous transmission if a specific condition is satisfied. Yes. FIG. 16 shows a conceptual diagram of Non-Patent Document 1. Assume that a101 is transmitting data to a102. a101 transmits an RTS to a102 before transmitting data, and a102 transmits a CTS to a101. Here, a102 adds the received power information of the RTS packet and the interference power information of a102 to the CTS packet. When a103 receives the CTS, the a103 refers to the CTS packet and further measures the received power information of the CTS packet. If a101 and a103 transmit with equal power, a103 estimates that if a103 transmits data, the interference power of a102 increases by the received power of the CTS packet. If a103 calculates the ratio (SINR) between the desired signal power of a102 when transmitted by itself and the signal power that causes interference (SINR), if it is determined that the transmission of a103 does not affect the reception of a102, then go to a104 RTS is transmitted.

特許文献１も非特許文献１と同じように、ＳＩＮＲによって同時送信の判定を行い、システム全体の伝送容量を増加させることを目的としている。図１７に特許文献１の概念図を示す。ＳＴＡ１およびＳＴＡ２はＡＰ１からのビーコンの受信電力を所望信号電力、ＡＰ２からのビーコンの受信電力を干渉信号電力として、その比を求める。同様にＳＴＡ３およびＳＴＡ４はＡＰ２からのビーコンの受信電力を所望信号電力、ＡＰ１らのビーコンの受信電力を干渉信号電力として、その比を求める。各ＡＰはＳＴＡが取得したビーコンによるＳＩＮＲ情報を取得し、送信先のＳＴＡが同時受信可能であれば、データ信号を同時に送信する。   Similar to Non-Patent Document 1, Patent Document 1 is also intended to determine the simultaneous transmission based on SINR and increase the transmission capacity of the entire system. FIG. 17 shows a conceptual diagram of Patent Document 1. STA1 and STA2 obtain the ratio of the beacon received power from AP1 as the desired signal power and the beacon received power from AP2 as the interference signal power. Similarly, STA3 and STA4 obtain the ratio of the received power of the beacon from AP2 as the desired signal power and the received power of the beacon from AP1 as the interference signal power. Each AP acquires SINR information by a beacon acquired by the STA, and transmits a data signal at the same time if the transmission destination STA is capable of simultaneous reception.

例えば図１７では、各ＡＰはＳＴＡ１とＳＴＡ３、ＳＴＡ４へは同時送信が可能であるが、ＳＴＡ２とＳＴＡ３へは同時送信が不可能であると判断する。
特開２００４−２６０６３７号公報 Ｉｎｔｅｒｆｅｒｅｎｃｅ Ａｗａｒｅ（ＩＡ）ＭＡＣ：ａｎ Ｅｎｈａｎｃｅｍｅｎｔ ｔｏ ＩＥＥＥ８０２．１１ｂ ＤＣＦ／ＩＥＥＥ ＶＴＣ Ｆａｌｌ２００３ For example, in FIG. 17, each AP determines that simultaneous transmission to STA1, STA3, and STA4 is possible, but simultaneous transmission to STA2 and STA3 is impossible.
Japanese Patent Laid-Open No. 2004-260637 Interference Aware (IA) MAC: an Enhancement to IEEE 802.11b DCF / IEEE VTC Fall 2003

しかしながら、非特許文献１では、ＣＴＳを受信した送信局のみが同時送信の判定を行う。   However, in Non-Patent Document 1, only the transmitting station that has received the CTS determines simultaneous transmission.

このため、例えば図１６において、ａ１０２が送信局で、ａ１０１が受信局であり、ａ１０３がＲＴＳを受信した場合においては同時送信の判定を行うことができないなど、同時送信の判定を行うことが可能となる無線局の配置トポロジが限定されているという課題を有していた。また、特許文献１では、送信局であるＡＰの同時送信の送信判定は行っているが、受信局であるＳＴＡのＡＣＫ送信の衝突については考慮されていないという課題を有していた。本発明は、前記従来の課題を解決するもので、自律分散制御を行う無線通信システムにおいて、すべての無線局の配置トポロジにおいて、送信局および受信局が同時送信の判定を行うことを可能としている。   For this reason, for example, in FIG. 16, when a102 is a transmitting station, a101 is a receiving station, and a103 receives an RTS, it is possible to determine simultaneous transmission, such as being unable to determine simultaneous transmission. There is a problem that the arrangement topology of the wireless stations is limited. Further, in Patent Document 1, although transmission determination of simultaneous transmission of an AP that is a transmission station is performed, there is a problem that a collision of ACK transmission of a STA that is a reception station is not considered. The present invention solves the above-described conventional problems, and enables a transmitting station and a receiving station to determine simultaneous transmission in a wireless communication system that performs autonomous distributed control in an arrangement topology of all wireless stations. .

前記従来の課題を解決するために、本発明の無線通信方法は無線局が、送信データの発呼要求が生起した場合に無線送信局はデータを送信する前に、自局の干渉電力情報を付加した制御信号を送信するステップと、この制御信号の宛先となる無線受信局がこの信号を受信すると、この制御信号の受信電力と、受信した無線局の干渉電力情報を付加した制御パケットを送信するステップと、無線送信局の制御信号を受信した無線受信局以外の無線局は、信号を送信するときには、無線受信局の制御信号の送信予定時刻まで送信を待機するステップと、無線受信局の制御信号を受信した無線局がパケットの送信を行う前に、無線受信機の制御信号の受信パケットを元にパケットの送信判定を行うステップを特徴とする。   In order to solve the above-described conventional problem, the wireless communication method of the present invention is configured such that when a wireless station makes a transmission data call request, the wireless transmission station transmits the interference power information of the local station before transmitting the data. A step of transmitting the added control signal, and when the radio receiving station that is the destination of the control signal receives this signal, a control packet to which the received power of the control signal and the interference power information of the received radio station are added is transmitted. A wireless station other than the wireless receiving station that has received the control signal of the wireless transmitting station, when transmitting the signal, waits for transmission until the scheduled transmission time of the control signal of the wireless receiving station, and The wireless station which received the control signal performs the packet transmission determination based on the received packet of the control signal of the wireless receiver before transmitting the packet.

本発明によれば、干渉源の信号が届くが、干渉源の通信に影響を与えることなく、さらに干渉源の影響を受けることなく通信可能である送受信局が通信を行うことが可能となるため、システム全体の伝送容量を向上させることができる。また、送信局と受信局は干渉源となる端末の送信タイミングに依存する必要が無いため、アドホック構成のような、制御局や基地局の無いシステム構成でも同時送信が可能となる。   According to the present invention, a signal from an interference source reaches, but it is possible for a transmission / reception station that can communicate without affecting the communication of the interference source and without being affected by the interference source to perform communication. The transmission capacity of the entire system can be improved. Further, since the transmitting station and the receiving station do not need to depend on the transmission timing of the terminal serving as an interference source, simultaneous transmission is possible even in a system configuration without a control station or a base station, such as an ad hoc configuration.

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１は、本発明の概略図である。今、無線局Ａに無線局Ｂへの発呼要求が発生する場合を考える。無線局Ａはまず無線局ＢへＲＴＳを送信し（ＲＴＳ（Ａ））、ＲＴＳ（Ａ）を受信した無線局ＢはＣＴＳを無線局Ａへ返信する（ＣＴＳ（Ｂ））。ＣＴＳ（Ｂ）を受信した無線局Ａはデータを無線局Ｂへ送信する。無線局Ｃが無線局Ｄへデータの送信を行う場合に無線局ＡＢの通信が干渉源となっている場合を考える。つまり、ＲＴＳ（Ａ）の送信の後のいずれかの時点で無線局Ｃに発呼要求が発生するという場合を考える。 (Embodiment 1)
FIG. 1 is a schematic diagram of the present invention. Consider a case where a call request to the wireless station B is generated in the wireless station A. The wireless station A first transmits an RTS to the wireless station B (RTS (A)), and the wireless station B that has received the RTS (A) returns a CTS to the wireless station A (CTS (B)). The wireless station A that has received the CTS (B) transmits data to the wireless station B. Consider a case where the communication of the wireless station AB is an interference source when the wireless station C transmits data to the wireless station D. That is, a case is considered in which a call request is generated in the wireless station C at any time after the transmission of RTS (A).

図２に、無線局Ａと無線局Ｂ間のパケット送信のフローチャートを示す。まず、無線局ＡはＲＴＳパケットを無線局Ｂに送信する。この時、ＲＴＳパケットには無線局Ａでの干渉電力情報と、過去の無線局Ｂからの信号の受信電力情報を付加して送信を行う（フロー２０１）。これは、無線局ＡＢ間の信号電力の減衰量の情報をＲＴＳパケットに付加するためである。受信した無線局Ｂは、Ｂでの干渉電力情報と、無線局Ａが送信したＲＴＳパケットの受信電力情報を付加して、ＣＴＳパケットを無線局Ａへ送信する（フロー２０２）。干渉電力情報の測定方法であるが、好ましい測定方法としては、周期的に通信チャネルでの信号電力を測定し、過去所定回数の中で、最も受信電力が大きい電力を干渉電力とする方法がある。   FIG. 2 shows a flowchart of packet transmission between the wireless station A and the wireless station B. First, the wireless station A transmits an RTS packet to the wireless station B. At this time, the RTS packet is transmitted with the interference power information at the wireless station A and the received power information of the signal from the past wireless station B added (flow 201). This is because information on the attenuation amount of the signal power between the radio stations AB is added to the RTS packet. The received wireless station B adds the interference power information in B and the received power information of the RTS packet transmitted by the wireless station A, and transmits the CTS packet to the wireless station A (flow 202). Although it is a method for measuring interference power information, as a preferable measurement method, there is a method in which the signal power in the communication channel is periodically measured and the power having the largest received power among the past predetermined number of times is used as the interference power. .

ＣＴＳパケットを受信した無線局ＡはＲＴＳパケットの送信時に、過去の無線局Ｂからの信号の受信電力情報があった場合には、通常のデータ信号を無線局Ｂへ送信する。過去のＢからの信号受信電力情報が無かった場合には、直前に受信したＢからのＣＴＳの受信電力情報をデータパケットに付加して送信を行う。これは、ＲＴＳ（Ａ）のみを受信した無線局に無線局Ｂが送信した信号の無線局Ａでの受信電力情報を取得することができるようにするためである。なお、無線局Ｂは必ずしも過去の無線局Ｂからの信号の受信電力情報が無かった場合にのみ、データ信号を無線局Ｂへ送信する必要はなく、常にデータ信号にＣＴＳの受信電力情報を付加しても良い。無線局の移動度が高い場合などは、過去の受信電力情報と実際の受信電力との差が大きくなってしまうため、データ信号に受信電力情報を付加することによって、他の無線局により信頼度の高い受信電力情報を通知することが可能となる。   The wireless station A that has received the CTS packet transmits a normal data signal to the wireless station B when there is reception power information of a signal from the wireless station B in the past when the RTS packet is transmitted. If there is no signal reception power information from B in the past, the CTS reception power information from B just received is added to the data packet for transmission. This is to make it possible to acquire the received power information at the wireless station A of the signal transmitted by the wireless station B to the wireless station that has received only RTS (A). Note that the radio station B does not necessarily need to transmit a data signal to the radio station B only when there is no signal reception power information from the past radio station B, and always adds CTS reception power information to the data signal. You may do it. When the mobility of the radio station is high, the difference between the past received power information and the actual received power becomes large. Therefore, by adding the received power information to the data signal, the reliability is improved by other radio stations. High reception power information can be notified.

図３から図５を用いて、送信局Ｃに送信局Ｄへの発呼要求が発生した場合に、送信局Ｃおよび送信局Ｄが同時送信の判定を行う一般的なフローチャートを示す。まず無線局Ｃに発呼要求が発生すると、無線局Ｃは無線局Ａが送信したＲＴＳ（Ａ）を受信したかどうかを判定する（フロー３０１）。ＲＴＳ（Ａ）を受信していない場合、無線局ＣはＣＴＳ（Ｂ）を受信したか判定を行う（フロー３０３）。ＣＴＳ（Ｂ）を受信していなければ、ＲＴＳを送信する（フロー３１１）ＣＴＳ（Ｂ）を受信した場合、ＣＴＳ（Ｂ）パケットの内容と共に、Ｃの送信がＢの受信を妨害しないか判定を行い（フロー３１０）、妨害しないのであれば、ＲＴＳを無線局Ｄへ送信する（フロー３１１）。このＲＴＳには、無線局Ａが送信したＲＴＳ（Ａ）パケットと同様に、過去の無線局Ｄの信号受信電力情報と、無線局Ｃの干渉電力情報を付加する。なお、好ましい過去の受信電力情報は最も直前に無線局Ｄが無線局Ｃへ送信したパケットの受信電力情報であり、過去に無線局Ｄが無線局Ｃへ送信したデータパケットや、ＡＣＫパケット等が考えられる。フロー３０１において、無線局ＣがＲＴＳ（Ａ）を受信した場合、無線局Ｃは続いて無線局ＢのＣＴＳパケットＣＴＳ（Ｂ）を受信する可能性があるため、ＣＴＳ（Ｂ）の受信予定時刻まで送信待機を行う（フロー３０２）。   A general flowchart in which the transmitting station C and the transmitting station D determine simultaneous transmission when a call request to the transmitting station D is generated in the transmitting station C will be described with reference to FIGS. First, when a call request is generated in the wireless station C, the wireless station C determines whether or not the RTS (A) transmitted by the wireless station A has been received (flow 301). If RTS (A) has not been received, the wireless station C determines whether CTS (B) has been received (flow 303). If CTS (B) is not received, RTS is transmitted (flow 311). When CTS (B) is received, it is determined whether the transmission of C does not interfere with the reception of B along with the contents of the CTS (B) packet. If there is no interference, the RTS is transmitted to the radio station D (flow 311). Similarly to the RTS (A) packet transmitted by the wireless station A, the past signal reception power information of the wireless station D and interference power information of the wireless station C are added to this RTS. Note that the preferable past received power information is the received power information of the packet transmitted from the wireless station D to the wireless station C most recently, such as a data packet or an ACK packet transmitted from the wireless station D to the wireless station C in the past. Conceivable. In the flow 301, when the wireless station C receives RTS (A), the wireless station C may subsequently receive the CTS packet CTS (B) of the wireless station B, so the scheduled reception time of CTS (B) (Step 302).

ここで、無線局Ｃが受信したＲＴＳ（Ａ）パケットに過去の履歴情報が付加されていない場合、無線局Ａはデータ信号に過去の受信電力情報を付加して送信すると考えられるため、無線局Ｃは無線局Ａのデータ信号の受信予定時刻まで送信待機を行う（フロー３０５）。履歴情報があった場合には、即座にＣＴＳ（Ｂ）を受信したか否かの判定を行う（フロー３０６）。フロー３０６において、ＣＴＳ（Ｂ）を受信した場合、無線局ＣはＲＴＳ（Ａ）およびＣＴＳ（Ｂ）を受信したことになるため、無線局Ｃのデータ信号の送信が、無線局Ａが送信したデータの無線局Ｂでの受信や、無線局Ｂが送信したＡＣＫの無線局Ａでの受信を妨害する可能性がある。このため、フロー３０７において、無線局Ｃは無線局Ｃの信号の送信が無線局ＡＢの受信を妨害しないかどうかを、受信したＲＴＳ（Ａ）パケットおよびＣＴＳ（Ｂ）パケットの内容と、それぞれのパケットの受信電力情報を元に判定し、妨害しないと判定すればＲＴＳ（Ｃ）パケットを送信する。一方、判定の結果、無線局Ｃは無線局Ｃの信号の送信が無線局ＡＢの受信を妨害すると判定すればＲＴＳ（Ｃ）パケットの送信を中止する（フロー３０９）。なお、具体的な判定方法については後述する。   Here, when the past history information is not added to the RTS (A) packet received by the wireless station C, it is considered that the wireless station A adds the past received power information to the data signal and transmits it. C waits for transmission until the scheduled reception time of the data signal of the wireless station A (flow 305). If there is history information, it is immediately determined whether CTS (B) has been received (flow 306). When the CTS (B) is received in the flow 306, the wireless station C has received the RTS (A) and the CTS (B), and therefore the wireless station C transmits the data signal. There is a possibility that reception of data at the wireless station B and reception of ACK transmitted by the wireless station B at the wireless station A may be hindered. For this reason, in the flow 307, the wireless station C determines whether the transmission of the signal of the wireless station C does not interfere with the reception of the wireless station AB, and the contents of the received RTS (A) packet and CTS (B) packet, respectively. A determination is made based on the received power information of the packet, and if it is determined not to interfere, an RTS (C) packet is transmitted. On the other hand, as a result of the determination, if it is determined that the transmission of the signal of the wireless station C interferes with the reception of the wireless station AB, the wireless station C stops the transmission of the RTS (C) packet (flow 309). A specific determination method will be described later.

フロー３０６において、ＣＴＳ（Ｂ）を受信しなかった場合、無線局ＣはＲＴＡ（Ａ）のみを受信したので、無線局Ｃの送信が無線局ＡのＡＣＫ受信を妨害するか否かを判定し、妨害しないと判定すればＲＴＳ（Ｃ）パケットを送信する。ここで、ＲＴＳ（Ａ）パケットに過去の受信電力情報が存在した場合、無線局ＣはＲＴＳ（Ａ）パケットの内容と、ＲＴＳ（Ａ）パケットの受信電力情報を元に、同時送信の判定を行う。一方過去の受信電力情報が存在しない場合、無線局Ｃはデータ信号に含まれる情報と、その受信電力情報を元に同時送信の判定を行う。無線局Ｃは自局の送信が無線局ＡＢの受信を妨害すると判定すれば、ＲＴＳの送信を中止する（フロー３０９）。   In the flow 306, if the CTS (B) is not received, the wireless station C has received only the RTA (A), so it is determined whether or not the transmission of the wireless station C interferes with the ACK reception of the wireless station A. If it is determined not to interfere, an RTS (C) packet is transmitted. Here, when there is past received power information in the RTS (A) packet, the wireless station C determines simultaneous transmission based on the contents of the RTS (A) packet and the received power information of the RTS (A) packet. Do. On the other hand, when the past received power information does not exist, the wireless station C determines simultaneous transmission based on the information included in the data signal and the received power information. If the wireless station C determines that the transmission of the local station interferes with the reception of the wireless station AB, the wireless station C stops transmitting the RTS (flow 309).

図４にＲＴＳ（Ｃ）パケットを受信した無線局ＤがＣＴＳ（Ｄ）パケットを送信するか否かを判定するまでのフローチャートを示す。ＲＴＳ（Ｃ）を受信した無線局Ｄは、図３の場合と同様に、ＲＴＳ（Ａ）を受信しなければ、ＣＴＳ（Ｄ）パケットを送信する。この時ＣＴＳ（Ｄ）パケットには、無線局Ｄでの干渉電力情報と、ＲＴＳ（Ｃ）の受信電力情報を付加する。フロー３０２からフロー３０６までの一連の動作は図３で示された無線局Ｃの動作と同じである。   FIG. 4 shows a flowchart until the wireless station D that has received the RTS (C) packet determines whether or not to transmit the CTS (D) packet. The wireless station D that has received the RTS (C) transmits a CTS (D) packet if it does not receive the RTS (A), as in the case of FIG. At this time, interference power information at the radio station D and reception power information of RTS (C) are added to the CTS (D) packet. A series of operations from the flow 302 to the flow 306 is the same as the operation of the wireless station C shown in FIG.

フロー３０６において、ＣＴＳ（Ｂ）を受信した場合、無線局Ｃは、まず、ＲＴＳ（Ａ）パケットとＣＴＳ（Ｂ）パケットの情報とそれぞれのパケットの受信電力情報を元に、無線局Ｄの送信が無線局ＡＢの受信を妨害するか否かを判定する。さらに無線局ＤはＲＴＳ（Ｃ）パケットの内容と、その受信電力情報を判断材料として、無線局ＡＢの送信が無線局Ｄのデータ受信を妨害するか否かを判定する。これらの判定の結果、無線局Ｄの送信が無線局ＡＢの受信を妨害せず、かつ無線局ＡＢの送信が無線局Ｄの受信を妨害しないのであれば、無線局ＤはＣＴＳ（Ｄ）パケットを無線局Ｃへ送信する（フロー４０７）。   When the CTS (B) is received in the flow 306, the wireless station C first transmits the transmission of the wireless station D based on the information of the RTS (A) packet and the CTS (B) packet and the received power information of each packet. Determines whether to interfere with reception of the radio station AB. Further, the wireless station D determines whether or not the transmission of the wireless station AB interferes with the data reception of the wireless station D by using the contents of the RTS (C) packet and the received power information as a determination material. As a result of these determinations, if the transmission of the wireless station D does not interfere with the reception of the wireless station AB, and the transmission of the wireless station AB does not interfere with the reception of the wireless station D, the wireless station D transmits a CTS (D) packet. Is transmitted to the wireless station C (flow 407).

フロー３０６において、無線局Ｄは、ＣＴＳ（Ｂ）を受信しなければ、無線局Ｄの送信が無線局Ａの受信を妨害せず、かつ、無線局Ａの送信が無線局Ｄの送信を妨害しないと判断すれば（フロー４０８）、ＣＴＳパケットを送信する（フロー４０３）。無線局Ｄは、無線局Ｄの送信が無線局Ａの受信を妨害すると判断した場合や、無線局Ａの送信が無線局Ｄの受信を妨害すると判断すればＣＴＳパケットの送信を中止する（フロー４０９）。無線局Ｄの判定方法に関しても、無線局Ｃの場合と同様に、ＲＴＳ（Ａ）パケットに過去の受信電力情報が存在した場合、無線局ＤはＲＴＳ（Ａ）パケットの内容と、ＲＴＳ（Ａ）パケットの受信電力情報を元に、同時送信の判定を行う。一方過去の受信電力情報が存在しない場合、無線局Ｄはデータ信号に含まれる情報と、その受信電力情報を元に同時送信の判定を行う。   In the flow 306, if the wireless station D does not receive CTS (B), the transmission of the wireless station D does not interfere with the reception of the wireless station A, and the transmission of the wireless station A interferes with the transmission of the wireless station D. If it is determined not to do so (flow 408), a CTS packet is transmitted (flow 403). When the wireless station D determines that the transmission of the wireless station D interferes with the reception of the wireless station A, or when it determines that the transmission of the wireless station A interferes with the reception of the wireless station D, the wireless station D stops transmitting the CTS packet (flow). 409). Regarding the determination method of the wireless station D, as in the case of the wireless station C, when the past received power information exists in the RTS (A) packet, the wireless station D determines the contents of the RTS (A) packet and the RTS (A ) Judge the simultaneous transmission based on the received power information of the packet. On the other hand, when there is no past received power information, the wireless station D determines simultaneous transmission based on the information included in the data signal and the received power information.

図５に無線局ＣがＣＴＳパケットを受信してから、無線局Ｄへデータを送信するまでの一連のフローチャートを示す。   FIG. 5 shows a series of flowcharts from when the wireless station C receives the CTS packet until it transmits data to the wireless station D.

フロー３０２からフロー３０６までの一連の動作は図３で示された無線局Ｃの動作と同じである。   A series of operations from the flow 302 to the flow 306 is the same as the operation of the wireless station C shown in FIG.

フロー３０３において、ＣＴＳ（Ｂ）を受信したかどうかを判定し、受信しなければ、データを送信する（フロー５１１）。ＣＴＳ（Ｂ）を受信しなければ、Ｄの送信が、Ｂの受信を妨害せず、かつＢの送信がＤの受信を妨害しないかを判定する（フロー５１０）。   In flow 303, it is determined whether or not CTS (B) has been received. If not, data is transmitted (flow 511). If CTS (B) is not received, it is determined whether D's transmission does not interfere with B's reception and B's transmission does not interfere with D's reception (flow 510).

無線局ＣはＲＴＳ（Ａ）を受信しなければ、無線局Ｃはデータを送信する（フロー５１１）。   If the wireless station C does not receive RTS (A), the wireless station C transmits data (flow 511).

フロー３０６において、無線局ＣがＣＴＳ（Ｂ）を受信すれば、無線局ＣはＣＴＳ（Ｄ）に付加された情報とＲＴＳ（Ａ）およびＣＴＳ（Ｂ）の受信した情報を元に無線局ＡＢの送信が無線局Ｃの受信を妨害するか否かを判定し、妨害しないと判定すればデータを送信、妨害すると判定すればデータ送信を中止する（フロー５０９）。   In step 306, if the wireless station C receives CTS (B), the wireless station C uses the information added to CTS (D) and the information received by RTS (A) and CTS (B) to wireless station AB. Whether or not the transmission of the wireless station C interferes with the reception of the wireless station C is determined. If it is determined that the transmission is not disturbed, the data is transmitted. If it is determined that the transmission is disturbed, the data transmission is stopped (flow 509).

フロー３０６において、ＣＴＳ（Ｂ）を受信しなかった場合、無線局ＣはＲＴＳ（Ａ）の受信した情報を元に、無線局Ａの送信が、無線局Ｃの受信を妨害するか否かを判定し、妨害しないのであればデータを送信し、妨害するのであればデータの送信を中止する。ここで、ＲＴＳ（Ａ）パケットに過去の受信電力情報が存在した場合、無線局ＣはＲＴＳ（Ａ）パケットの内容と、ＲＴＳ（Ａ）パケットの受信電力情報を元に、同時送信の判定を行う。一方過去の受信電力情報が存在しない場合、無線局Ｃはデータ信号に含まれる情報と、その受信電力情報を元に同時送信の判定を行う。   If the CTS (B) is not received in the flow 306, the wireless station C determines whether the transmission of the wireless station A interferes with the reception of the wireless station C based on the information received by the RTS (A). If it is determined that there is no interference, the data is transmitted. If the interference is interrupted, the data transmission is stopped. Here, when there is past received power information in the RTS (A) packet, the wireless station C determines simultaneous transmission based on the contents of the RTS (A) packet and the received power information of the RTS (A) packet. Do. On the other hand, when the past received power information does not exist, the wireless station C determines simultaneous transmission based on the information included in the data signal and the received power information.

以上が本発明における無線送受信局の一般的な動作のフローチャートである。   The above is a flowchart of the general operation of the radio transceiver station according to the present invention.

ここで、同時送信の判定方法を含めた詳細な動作説明を図１０の無線局のトポロジを代表として説明する。   Here, a detailed description of the operation including the method for determining simultaneous transmission will be given with the topology of the radio station in FIG. 10 as a representative.

図６に端末配置のトポロジを示す。送信局１０１は受信局１０２と過去に通信をしていないとする。   FIG. 6 shows a topology of terminal arrangement. Assume that the transmitting station 101 has not communicated with the receiving station 102 in the past.

送信局１０１は受信局１０２へデータの送信を行う。送信局１０１は受信局１０２へＲＴＳ（Ａ）を送信し、受信局１０２は送信局１０１へＣＴＳ（Ｂ）を送信する。受信局１０２からのＣＴＳを受信した送信局１０１は受信局１０２へデータの送信を行う。   The transmitting station 101 transmits data to the receiving station 102. The transmitting station 101 transmits RTS (A) to the receiving station 102, and the receiving station 102 transmits CTS (B) to the transmitting station 101. The transmitting station 101 that has received the CTS from the receiving station 102 transmits data to the receiving station 102.

送信局１０１と受信局１０２はお互いのＲＴＳ／ＣＴＳパケットを受信可能である。また送信局（Ｃ）１０３は送信局１０１が送信したＲＴＳパケットを受信することが可能であるとする。受信局（Ｄ）１０４は１０３のパケットを受信することができるが、送信局１０１および受信局１０２の制御パケットを受信することはできないとする。   The transmitting station 101 and the receiving station 102 can receive each other's RTS / CTS packets. Further, it is assumed that the transmission station (C) 103 can receive the RTS packet transmitted by the transmission station 101. The receiving station (D) 104 can receive 103 packets, but cannot receive control packets from the transmitting station 101 and the receiving station 102.

図７に制御パケットとデータフレームのフレームフォーマットを示す。送信局１０１が受信局１０２へ送信するＲＴＳ（Ａ）のフレームフォーマット７０１には、送信局１０１での干渉電力情報を付加する。受信局１０２が送信局１０１へ送信するＣＴＳ（Ｂ）のフレームフォーマット７０２には、受信局１０２での干渉電力情報と７０１の受信電力情報を付加する。ＲＴＳ（Ｃ）のフレームフォーマットは、ＲＴＳフレームに、送信局１０３の干渉電力情報を付加したもとなる。ＣＴＳ（Ｄ）のフレームフォーマットは、ＣＴＳフレームに受信局１０４の干渉情報と、１０７の受信電力情報を付加する。   FIG. 7 shows the frame format of the control packet and the data frame. Interference power information at the transmitting station 101 is added to the RTS (A) frame format 701 transmitted from the transmitting station 101 to the receiving station 102. The interference power information at the receiving station 102 and the received power information 701 are added to the CTS (B) frame format 702 transmitted from the receiving station 102 to the transmitting station 101. The RTS (C) frame format is obtained by adding the interference power information of the transmitting station 103 to the RTS frame. The CTS (D) frame format adds the interference information of the receiving station 104 and the received power information of 107 to the CTS frame.

送信局１０１が送信するデータ信号１１０のフレームフォーマット７０５は通常のデータフレームに加えて、受信局１０２が送信したＡＣＫ信号１０６の受信電力と送信局１０１での干渉電力を加えたものになる。   The frame format 705 of the data signal 110 transmitted by the transmitting station 101 is obtained by adding the reception power of the ACK signal 106 transmitted by the receiving station 102 and the interference power at the transmitting station 101 in addition to the normal data frame.

図８に過去ＡＣＫ受信電力情報を用いない場合におけるフローチャートを示す。送信局１０１が送信するＲＴＳ（Ｃ）は、送信局１０１の干渉電力情報が付加されている。送信局１０１は、データ信号１１０に受信局１０２が送信したＣＴＳの受信電力情報Ｐ＿Ａ＿ＣＴＳ＿Ｂを付加する。送信局１０３は、データの送信時刻まで送信待機を行い（フロー８０１）、ＲＴＳパケットの送信判定を行う（フロー８０３）。   FIG. 8 shows a flowchart when the past ACK received power information is not used. RTS (C) transmitted by the transmission station 101 is added with interference power information of the transmission station 101. The transmitting station 101 adds the CTS received power information P_A_CTS_B transmitted from the receiving station 102 to the data signal 110. The transmitting station 103 waits for transmission until the data transmission time (flow 801), and determines transmission of the RTS packet (flow 803).

１０３と受信局１０２が同時にパケットの送信を行った場合、送信局１０１での推定受信電力ＳＩＮＲ＿Ａ＿ｅｘｔはＣＴＳ（Ｂ）の送信局１０１の受信電力をＰ＿Ａ＿ＣＴＳ＿Ｂとし、さらに送信局１０１が送信したデータ信号の送信局１０３での受信電力をＰ＿Ｃ＿ＤＡＴＡ＿Ａとすると（数１）で表される。   103 and the receiving station 102 transmit packets at the same time, the estimated received power SINR_A_ext at the transmitting station 101 is P_A_CTS_B as the received power of the transmitting station 101 of CTS (B), and further the data signal transmitted by the transmitting station 101 When the reception power at the transmission station 103 is P_C_DATA_A, it is expressed by (Equation 1).

Figure 2007166373
Figure 2007166373

システムで定められた受信成功の閾値をＳＩＮＲ＿ｔｈｒとすると、ＳＩＮＲ＿Ａ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きいか否かを判定する（フロー８０２）。ＳＩＮＲ＿Ａ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きければ、送信局１０３はＲＴＳパケットを１０４へ送信する。ＲＴＳパケットを受信した受信局１０４はＣＴＳパケットの送信判定を行う。   If the reception success threshold determined by the system is SINR_thr, it is determined whether SINR_A_ext is greater than SINR_thr (flow 802). If SINR_A_ext is larger than SINR_thr, the transmitting station 103 transmits an RTS packet to 104. The receiving station 104 that has received the RTS packet performs transmission determination of the CTS packet.

ＣＴＳパケットを受信した受信局１０４は、送信局１０３が送信したＲＴＳ（Ｃ）の受信局１０４での受信電力をＰ＿Ｃ＿Ｄａｔａ＿Ａとすると以下の（数２）によって送信局１０３のＳＩＮＲを推定し、同時送信の判定を行う。   The receiving station 104 that has received the CTS packet estimates the SINR of the transmitting station 103 according to the following (Equation 2), assuming that the reception power at the receiving station 104 of the RTS (C) transmitted by the transmitting station 103 is P_C_Data_A. Judgment is made.

Figure 2007166373
Figure 2007166373

送信局１０３の推定受信ＳＩＮＲがＳＩＮＲ＿ｔｈｒより大きければ、受信局１０４はＣＴＳパケットを送信局１０３へ送信する。ＣＴＳパケットを受信した送信局１０３はデータを受信局１０４へ送信する。   If the estimated reception SINR of the transmission station 103 is larger than SINR_thr, the reception station 104 transmits a CTS packet to the transmission station 103. The transmitting station 103 that has received the CTS packet transmits data to the receiving station 104.

ここでＩ＿Ｃは周期的に干渉電力を測定し、ＲＴＳを受信してからＣＴＳを受信するまでの期間以上の観測を行い、その中で、最大の干渉電力とすることが望ましい。これによって、送信局１０１のＲＴＳや受信局１０２のＣＴＳ送信時に、送信局１０３の受信ＳＩＮＲが最も劣化した場合の推定を行うことが可能となる。その他の方法としては、特定の期間の干渉電力を測定しその平均値を干渉電力とする方法等が考えられる。   Here, I_C periodically measures the interference power, performs observation over a period from the reception of the RTS to the reception of the CTS, and it is desirable to set the maximum interference power among them. This makes it possible to estimate when the reception SINR of the transmission station 103 is most deteriorated during the RTS of the transmission station 101 or the CTS transmission of the reception station 102. As other methods, a method of measuring interference power in a specific period and setting the average value as interference power can be considered.

（実施の形態２）
本発明におけるもう一つの実施の形態を説明する。 (Embodiment 2)
Another embodiment of the present invention will be described.

送信局が過去に受信局と通信したことがあり、送信局は過去の受信局からの受信電力情報を保持している場合の実施の形態である。端末の配置は図１０と同じであるとする。   This is an embodiment in the case where the transmitting station has communicated with the receiving station in the past, and the transmitting station holds the received power information from the past receiving station. It is assumed that the terminal arrangement is the same as in FIG.

図９に制御パケットとデータフレームのフレームフォーマットを示す。   FIG. 9 shows the frame format of the control packet and the data frame.

送信局１０１が受信局１０２へ送信するＲＴＳ（Ａ）のフレームフォーマット９０１には、送信局１０１での干渉電力情報と過去受信局１０２から受信したＡＣＫ信号の受信電力情報を付加する。受信局１０２が送信局１０１へ送信するＣＴＳのフレームフォーマット７０２には、受信局１０２での干渉電力情報と７０１の受信電力情報を付加する。なお、フレームフォーマット７０１に付加する情報は必ずしも、過去のＡＣＫの受信電力情報である必要はなく、受信局１０２が過去に送信した信号の受信電力情報や、ＣＴＳの受信電力情報でもよい。   The RTS (A) frame format 901 transmitted from the transmitting station 101 to the receiving station 102 is added with the interference power information at the transmitting station 101 and the received power information of the ACK signal received from the past receiving station 102. The interference power information at the receiving station 102 and the received power information 701 are added to the CTS frame format 702 transmitted from the receiving station 102 to the transmitting station 101. Note that the information added to the frame format 701 does not necessarily need to be past ACK received power information, but may be received power information of a signal transmitted by the receiving station 102 in the past or CTS received power information.

送信局１０１のＲＴＳパケットに過去の電力情報があった場合のフローチャートを図１０に示す。今、送信局１０１がＲＴＳの送信を行った後、１０３に発呼要求が発生したとする。送信局１０３はＲＴＳ（Ａ）を受信したため、ＣＴＳ（Ｂ）の受信予定時刻まで送信待機を行う（フロー１００１）。送信待機の後、送信局１０３はＣＴＳパケットの受信を行わなかったため、送信局１０３の送信が送信局１０１の受信を妨害するか否かを判定する（フロー１００２）。以下に判定方法を説明する。   FIG. 10 shows a flowchart when there is past power information in the RTS packet of the transmitting station 101. Assume that a call request is generated in 103 after the transmitting station 101 transmits RTS. Since the transmission station 103 has received RTS (A), it waits for transmission until the scheduled reception time of CTS (B) (flow 1001). After waiting for transmission, since the transmission station 103 did not receive the CTS packet, the transmission station 103 determines whether or not transmission of the transmission station 103 interferes with reception of the transmission station 101 (flow 1002). The determination method will be described below.

送信局１０３は送信局１０１のＲＴＳパケットに付加された過去ＡＣＫ受信電力を受信局１０２が送信局１０１へ信号を送信した場合の送信局１０１の受信電力と推定する。これによって、送信局１０３が信号を送信した場合の送信局１０１の推定ＳＩＮＲであるＳＩＮＲ＿Ａ＿ｅｘｔは送信局１０１が送信したＲＴＳの送信局１０３での受信電力をＰ＿Ｃ＿ＲＴＳ＿Ａとすると、以下の（数３）で表される。   The transmitting station 103 estimates the past ACK received power added to the RTS packet of the transmitting station 101 as the received power of the transmitting station 101 when the receiving station 102 transmits a signal to the transmitting station 101. Thus, SINR_A_ext which is an estimated SINR of the transmission station 101 when the transmission station 103 transmits a signal is expressed by the following (Equation 3), assuming that the reception power at the transmission station 103 of the RTS transmitted by the transmission station 101 is P_C_RTS_A. expressed.

Figure 2007166373
Figure 2007166373

システムで定められた無線局の受信成功の閾値をＳＩＮＲ＿ｔｈｒとすると、送信局１０３はＳＩＮＲ＿Ａ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きいか否かを判定する（フロー１００２）。ＳＩＮＲ＿Ａ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きければ、送信局１０３が送信しても、送信局１０１は受信局１０２の送信した信号の受信に十分なＳＩＮＲを確保できると推定されるため、１０３は１０４へＲＴＳパケットを送信する。１０３からのＲＴＳパケットを受信した受信局１０４はＲＴＳパケットの受信電力ＰＳ＿ＲＴＳ＿Ｒと、ＲＴＳパケットに付加された干渉電力情報Ｉ＿Ｃと、送信局１０１が送信したＲＴＳの送信局１０３での受信電力をＰ＿Ｃ＿ＲＴＳ＿Ａを元に、（数４）に基づいて１０４が信号を送信した場合の送信局１０３のＳＩＮＲを推定する。   If the reception success threshold of the radio station determined by the system is SINR_thr, the transmitting station 103 determines whether SINR_A_ext is greater than SINR_thr (flow 1002). If SINR_A_ext is larger than SINR_thr, it is presumed that even if the transmitting station 103 transmits, the transmitting station 101 can secure a sufficient SINR to receive the signal transmitted by the receiving station 102, so that 103 transmits an RTS packet to 104. To do. The receiving station 104 that has received the RTS packet from 103 uses the received power PS_RTS_R of the RTS packet, the interference power information I_C added to the RTS packet, and the received power at the transmitting station 103 of the RTS transmitted by the transmitting station 101 as P_C_RTS_A. Based on (Equation 4), the SINR of the transmitting station 103 when 104 transmits a signal is estimated.

Figure 2007166373
Figure 2007166373

１０４は推定したＳＩＮＲ＿Ｃ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きければＣＴＳパケットを送信する。ＣＴＳパケットを受信した１０３は１０４へデータパケットを送信する。   104 transmits a CTS packet if the estimated SINR_C_ext is greater than SINR_thr. 103 which received the CTS packet transmits a data packet to 104.

次に、別のトポロジ図を用いて説明を行う。   Next, description will be made using another topology diagram.

図１１に無線局の端末配置図を示す。送信局１１０１は受信局１１０２へデータの送信を行う。送信局１１０１は受信局１１０２へＲＴＳ（Ａ）を送信し、受信局１１０２は送信局１１０１へＣＴＳ（Ｂ）を送信する。受信局１１０２からのＣＴＳを受信した送信局１１０１は受信局１１０２へデータの送信を行う。送信局１１０１と受信局１１０２はお互いのＲＴＳ／ＣＴＳパケットを受信可能である。また送信局１１０３も送信局１１０１が送信したＲＴＳパケットと、受信局１１０２が送信したＣＴＳパケットを受信することが可能であるとする。受信局１１０４は送信局１１０３のパケットを受信することができるが、送信局１１０１および受信局１１０２の制御パケットを受信することはできないとする。   FIG. 11 shows a terminal arrangement diagram of the radio station. The transmitting station 1101 transmits data to the receiving station 1102. The transmitting station 1101 transmits RTS (A) to the receiving station 1102, and the receiving station 1102 transmits CTS (B) to the transmitting station 1101. The transmitting station 1101 that has received the CTS from the receiving station 1102 transmits data to the receiving station 1102. The transmitting station 1101 and the receiving station 1102 can receive each other's RTS / CTS packets. Further, it is assumed that the transmitting station 1103 can also receive the RTS packet transmitted from the transmitting station 1101 and the CTS packet transmitted from the receiving station 1102. The receiving station 1104 can receive the packet of the transmitting station 1103, but cannot receive the control packets of the transmitting station 1101 and the receiving station 1102.

フレームフォーマットを図１２に示す。ただし、図１２における１２０３のＩ＿Ｃは送信局１１０１の送信信号と、受信局１１０２の受信信号の送信局１１０３での受信電力の大きい方と、送信局１１０３での干渉電力の和となる。   The frame format is shown in FIG. However, I_C of 1203 in FIG. 12 is the sum of the transmission signal of the transmission station 1101, the higher reception power of the reception signal of the reception station 1102 at the transmission station 1103, and the interference power at the transmission station 1103.

図１３にフローチャート図を示す。送信局１１０１がＲＴＳを送信し、その直後に１１０３に発呼要求が発生したとする。１１０３は他局のＲＴＳ（Ａ）を受信した場合、ＣＴＳ（Ｂ）の受信予定時刻まで送信待機を行う（フロー１３０１）。図６の無線局のトポロジでは１１０３はＣＴＳ（Ｂ）パケットを受信するため、送信待機を行った後、１１０３は１１０５のフレームフォーマット７０１および１１０６のフレームフォーマット７０２の情報とそれぞれのパケットの１１０３での受信電力情報を元にＲＴＳの送信判定を行う。以下に判定方法を説明する。   FIG. 13 shows a flowchart. Assume that the transmitting station 1101 transmits an RTS, and immediately after that, a call request is generated in 1103. When 1103 receives RTS (A) of another station, 1103 waits for transmission until the scheduled reception time of CTS (B) (flow 1301). In the wireless station topology of FIG. 6, since 1103 receives the CTS (B) packet, after waiting for transmission, 1103 includes information on the frame format 701 of 1105 and the frame format 702 of 1106, and the information of each packet in 1103. RTS transmission determination is performed based on the received power information. The determination method will be described below.

今１１０３と受信局１１０２が同時に信号の送信を行った場合を考える。受信局１１０２がＲＴＳ（Ａ）と同一の送信電力で信号の送信を行った場合、送信局１１０１での信号の受信電力はＰ＿Ｂ＿ＲＴＳ＿Ａと推定される。同様に送信局１１０１の送信したＲＴＳ（Ａ）の１１０３での受信電力Ｐ＿Ｃ＿ＲＴＳ＿Ａは同じ送信電力で１１０３が信号を送信した場合の送信局１１０１での受信電力となると推定される。送信局１１０１での干渉電力は９０１よりＩ＿Ａであるので、送信局１０１での推定受信電力ＳＩＮＲ＿ＩＳ＿ｅｘｔは（数５）で表される。   Consider a case where the signal 1103 and the receiving station 1102 transmit signals simultaneously. When receiving station 1102 transmits a signal with the same transmission power as RTS (A), the received power of the signal at transmitting station 1101 is estimated to be P_B_RTS_A. Similarly, the received power P_C_RTS_A at 1103 of RTS (A) transmitted by the transmitting station 1101 is estimated to be the received power at the transmitting station 1101 when 1103 transmits a signal with the same transmission power. Since the interference power at the transmission station 1101 is I_A from 901, the estimated reception power SINR_IS_ext at the transmission station 101 is expressed by (Equation 5).

Figure 2007166373
Figure 2007166373

次に、１１０３と送信局１１０１が同時にパケットの送信を行った場合を考える。１１０３が受信局１１０２と同じ電力で送信するならば、１１０３が送信した信号の受信局１１０２での受信電力はＰ＿Ｃ＿ＣＴＳ＿Ｂと推定される。送信局１１０１が送信した信号の受信局１１０２での受信電力は、ＲＴＳ（Ａ）の受信電力なのでＰ＿Ｂ＿ＲＴＳ＿Ａである。また、受信局１１０２での干渉電力はＣＴＳ（Ｂ）よりＩ＿Ｂである。よって、受信局１１０２が送信したＣＴＳパケットの送信局１１０３での受信電力をＰ＿Ｃ＿ＣＴＳ＿Ｂとすると、受信局１１０２での推定受信電力ＳＩＮＲ＿Ｂ＿ｅｘｔは（数６）で表される。   Next, consider a case where 1103 and transmitting station 1101 transmit packets simultaneously. If 1103 transmits with the same power as the receiving station 1102, the received power at the receiving station 1102 of the signal transmitted by 1103 is estimated as P_C_CTS_B. The reception power at the reception station 1102 of the signal transmitted from the transmission station 1101 is P_B_RTS_A because it is the reception power of RTS (A). The interference power at the receiving station 1102 is I_B from CTS (B). Therefore, assuming that the reception power at the transmission station 1103 of the CTS packet transmitted by the reception station 1102 is P_C_CTS_B, the estimated reception power SINR_B_ext at the reception station 1102 is expressed by (Equation 6).

Figure 2007166373
Figure 2007166373

システムで定められた無線局の受信成功の閾値をＳＩＮＲ＿ｔｈｒとすると、１１０３はＳＩＮＲ＿Ａ＿ｅｘｔおよびＳＩＮＲ＿Ｂ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きいか否かを判定する（フロー１３０２）。ＳＩＮＲ＿Ａ＿ｅｘｔおよびＳＩＮＲ＿Ｂ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きければ、１１０３が送信しても、送信局１１０１および送信局１１０２は信号の受信に十分なＳＩＮＲを確保できると推定されるため、１１０３は１１０４へＲＴＳパケットを送信する。   If the reception success threshold of the radio station determined by the system is SINR_thr, 1103 determines whether SINR_A_ext and SINR_B_ext are larger than SINR_thr (flow 1302). If SINR_A_ext and SINR_B_ext are larger than SINR_thr, even if 1103 transmits, it is estimated that transmission station 1101 and transmission station 1102 can secure a sufficient SINR for signal reception, and 1103 transmits an RTS packet to 1104.

ＲＴＳパケットを受信した１１０４は自局の送信と、送信局１１０１または受信局１１０２の送信が重複した場合に、１１０３が受信可能か否かを同様にＳＩＮＲの推定によって判定を行う（フロー１３０３）。以下に判定方法を説明する。１１０４が信号を送信した場合に１１０３が受信する信号受信電力は、１１０４が１１０３のＲＴＳパケットと等電力で送信を行えばＰ＿Ｂ＿ＲＴＳ＿Ａと推定される。１１０３での干渉電力はＲＴＳ（Ｓ）に付加された情報よりＩ＿Ａと推定されるため、１１０４の送信による１１０３の推定ＳＩＮＲは（数７）の式によって表される。   When the transmission of the local station and the transmission of the transmission station 1101 or the reception station 1102 overlap, the 1104 that has received the RTS packet similarly determines whether or not the 1103 can be received by estimating the SINR (flow 1303). The determination method will be described below. The signal reception power received by 1103 when 1104 transmits a signal is estimated to be P_B_RTS_A if 1104 transmits with the same power as the RTS packet of 1103. Since the interference power at 1103 is estimated as I_A from the information added to RTS (S), the estimated SINR of 1103 due to the transmission of 1104 is expressed by the equation (Equation 7).

Figure 2007166373
Figure 2007166373

図１１の場合であれば、送信局１１０１の送信信号と受信局１１０２の受信信号の受信電力の大きい方がＩ＿Ｃの支配的な値になると考えられる。   In the case of FIG. 11, it can be considered that the larger reception power of the transmission signal of the transmission station 1101 and the reception signal of the reception station 1102 is the dominant value of I_C.

ＳＩＮＲ＿Ｃ＿ｅｘｔがＳＩＮＲ＿ｔｈｒより大きければ、１１０４はＣＴＳを送信する。ＣＴＳを受信した１１０３はデータ送信を開始し、データを受信した１１０４はＡＣＫを返信する。   If SINR_C_ext is greater than SINR_thr, 1104 transmits a CTS. 1103 which received CTS starts data transmission, and 1104 which received data returns ACK.

なお、以上に述べたすべての実施形態において、ＲＴＳ／ＣＴＳパケットの送受信を行うシステムを想定したが、本発明は必ずしもＲＴＳ／ＣＴＳの送受信を行うシステムに限定されるものではなく、通信前に送受新端末で制御信号を交換する無線通信方法一般に適用可能である。さらには、データ信号とＡＣＫパケットに信号受信電力情報や、干渉信号電力情報を付加することによって、制御信号を利用しない通信システムにも応用可能である。   In all the embodiments described above, a system that transmits / receives an RTS / CTS packet is assumed. However, the present invention is not necessarily limited to a system that transmits / receives an RTS / CTS. The present invention is generally applicable to a wireless communication method for exchanging control signals with a new terminal. Furthermore, the present invention can be applied to a communication system that does not use a control signal by adding signal reception power information and interference signal power information to a data signal and an ACK packet.

図１４に本発明における無線局Ａ・Ｂの構成図を示す。受信電力測定部１４０２は、無線受信機１４０７で受信した信号の受信電力を測定する部分である。１４０２の装置を用いて、ＲＴＳ／ＣＴＳパケットの受信電力や、干渉電力を測定する。過去受信電力記憶部は、受信電力測定部で測定した内容を保存する装置であり、制御パケットに１４０１に保存された情報を付加することができる。また、受信電力測定部１４０２で測定した情報はデータパケット生成部１４０４でデータパケットに付加することが可能である。送信待機部１４０５はＣＴＳパケットの受信予定時刻まで送信を待機する場合や、データパケットの受信予定時刻まで送信を待機する場合に、データパケットや、制御パケットの送信を一時的に待機させ、送信を行う時刻になれば、無線送信機１４０６へ信号を送信する。   FIG. 14 shows a configuration diagram of the radio stations A and B in the present invention. The received power measuring unit 1402 is a part that measures the received power of the signal received by the wireless receiver 1407. The reception power of the RTS / CTS packet and the interference power are measured using the apparatus 1402. The past received power storage unit is a device that stores the content measured by the received power measurement unit, and can add information stored in 1401 to the control packet. Information measured by the received power measuring unit 1402 can be added to the data packet by the data packet generating unit 1404. When waiting for transmission until the scheduled reception time of the CTS packet or when waiting for transmission until the scheduled reception time of the data packet, the transmission standby unit 1405 temporarily waits for transmission of the data packet or control packet, and When it is time to perform, a signal is transmitted to the wireless transmitter 1406.

図１５に本発明における無線局Ｃ・Ｄの構成図を示す。   FIG. 15 shows a configuration diagram of the radio stations C and D in the present invention.

与干渉判定部１５０９は受信電力測定部で測定された情報を元に、自局の送信が他局に与える影響から、制御パケット送信の可否を判定する。被干渉判定部１５０８では、受信電力測定部で測定された情報を元に他局の通信が自局の通信相手に与える影響から、制御パケット送信の可否を判定する。   Based on the information measured by the received power measurement unit, the interference determination unit 1509 determines whether or not control packet transmission is possible based on the influence of transmission of the local station on other stations. Based on the information measured by the received power measurement unit, the interfered determination unit 1508 determines whether or not control packet transmission is possible from the influence of communication of other stations on the communication partner of the own station.

通信開始可否判定部１５１０で受信電力測定部で測定された情報を元に送信判定を行う。   A communication start availability determination unit 1510 performs transmission determination based on information measured by the received power measurement unit.

なお、以上に述べた全ての実施の形態の構成は、典型的には集積回路であるＬＳＩとして実現されてもよい。これらは、個別に１チップ化されてもよいし、上述した実施の形態の全ての構成または一部の構成を含むように１チップ化されてもよい。ここでは、ＬＳＩとしたが、集積度の違いにより、ＩＣ、システムＬＳＩ、スーパーＬＳＩ、ウルトラＬＳＩと呼称されることもある。   The configurations of all the embodiments described above may be realized as an LSI that is typically an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include all or a part of the configuration of the above-described embodiment. The name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.

また、集積回路化の手法はＬＳＩに限るものではなく、専用回路又は汎用プロセサで実現してもよい。ＬＳＩ製造後に、プログラムすることが可能なＦＰＧＡ（Ｆｉｅｌｄ Ｐｒｏｇｒａｍｍａｂｌｅ Ｇａｔｅ Ａｒｒａｙ）や、ＬＳＩ内部の回路セルの接続や設定を再構成可能なリコンフィギュラブル・プロセッサーを利用しても良い。   Further, the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

さらには、半導体技術の進歩又は派生する別技術によりＬＳＩに置き換わる集積回路化の技術が登場すれば、当然、その技術を用いて機能ブロックの集積化を行ってもよい。バイオ技術の適応等が可能性としてありえる。   Further, if integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. Biotechnology can be applied.

本発明にかかる無線通信方法は、複数リンクの同時送信を行うことで高いシステム伝送容量を得られることから、無線ＬＡＮなどの、一定の空間に多数の無線局を配置する無線システムにおいて有効である。また、時分割で複数リンクを伝送すると容量不足になりやすい、映像情報などの高速大容量なデータを連続的に伝送する場合において、特に有効である。   The wireless communication method according to the present invention is effective in a wireless system in which a large number of wireless stations are arranged in a certain space, such as a wireless LAN, because a high system transmission capacity can be obtained by simultaneously transmitting a plurality of links. . Further, it is particularly effective when high-speed and large-capacity data such as video information is continuously transmitted, which tends to cause a capacity shortage when a plurality of links are transmitted in a time division manner.

本発明の実施の形態１における概要図Schematic diagram in Embodiment 1 of the present invention 本発明の実施の形態１における無線局間のパケット送信のフローチャートFlowchart of packet transmission between radio stations in Embodiment 1 of the present invention 本本発明の実施の形態１におけるフローチャートFlowchart in Embodiment 1 of the present invention 本発明の実施の形態１におけるフローチャートFlowchart in Embodiment 1 of the present invention 本発明の実施の形態１におけるフローチャートFlowchart in Embodiment 1 of the present invention 本発明の実施の形態１における端末配置図Terminal arrangement in Embodiment 1 of the present invention 本発明の実施の形態１におけるフレーム図Frame diagram according to Embodiment 1 of the present invention 本発明の実施の形態１におけるフローチャートFlowchart in Embodiment 1 of the present invention 本発明の実施の形態２におけるフレーム図Frame diagram in Embodiment 2 of the present invention 本発明の実施の形態２におけるフローチャートFlowchart in Embodiment 2 of the present invention 本発明の実施の形態２における端末配置図Terminal arrangement diagram in Embodiment 2 of the present invention 本発明の実施の形態２におけるフレーム図Frame diagram in Embodiment 2 of the present invention 本発明の実施の形態２におけるフローチャートFlowchart in Embodiment 2 of the present invention 本発明における無線局Ａ・Ｂの構成図Configuration diagram of radio stations A and B in the present invention 本発明における無線局Ｃ・Ｄの構成図Configuration diagram of radio stations C and D in the present invention 本発明の先行例１の概念図Conceptual diagram of the first example of the present invention 本発明の先行例２の概念図Conceptual diagram of Prior Example 2 of the present invention

符号の説明Explanation of symbols

Ａ〜Ｄ 無線局
１０１〜１０４ 無線局
１０５，１０７ ＲＴＳ
１０６，１０８ ＣＴＳ
１０９，１１０ データ
１１０１〜１１０４ 無線局
１１０５，１１０７ ＲＴＳ
１１０６，１１０８ ＣＴＳ
１１０９，１１１０ データ A to D radio stations 101 to 104 radio stations 105 and 107 RTS
106,108 CTS
109,110 Data 1101-1104 Radio stations 1105, 1107 RTS
1106, 1108 CTS
1109,1110 data

Claims (10)

第１の無線局が、送信データの発呼要求が生起した場合に前記送信データの送信前に自局における干渉電力情報を付加した第１の制御信号を送信するステップと、
前記第１の制御信号の宛先である第２の無線局が、前記第１の制御信号の受信電力情報と自局における干渉電力情報とを付加した第２の制御信号を送信するステップと、
前記第１の制御信号を受信した第３の無線局が、前記第２の制御信号の送信予定時刻まで送信を待機するステップと、
前記第２の制御信号を受信した第３の無線局が、パケットの送信を行う前に前記第２の制御信号の情報を元にパケットの同時送信が可能かどうかの判定を行うステップとを含む無線通信方法。 A first wireless station transmitting a first control signal to which interference power information in the local station is added before transmission of the transmission data when a transmission data call request occurs;
A second wireless station that is a destination of the first control signal transmits a second control signal to which the received power information of the first control signal and interference power information in the own station are added;
The third wireless station receiving the first control signal waits for transmission until the scheduled transmission time of the second control signal;
A third wireless station that has received the second control signal determines whether simultaneous packet transmission is possible based on information of the second control signal before transmitting the packet. Wireless communication method. 前記第１の無線局は、前記第１の制御信号に前記第１の制御信号を送信する前に受信した前記第２の無線局からの送信信号の受信電力情報をさらに付加することを特徴とする請求項１記載の無線通信方法。 The first radio station further adds reception power information of a transmission signal from the second radio station received before transmitting the first control signal to the first control signal. The wireless communication method according to claim 1. 前記第１の制御信号を受信した第３の無線局が、パケットの送信を行う前に前記第１の制御信号の情報を元にパケットの同時送信が可能かどうかの判定を行うステップをさらに含む請求項２記載の無線通信方法。 The third wireless station that has received the first control signal further includes a step of determining whether or not simultaneous transmission of the packet is possible based on the information of the first control signal before transmitting the packet. The wireless communication method according to claim 2. 前記第１の無線局が、前記第２の制御信号の受信電力情報と、自局における干渉電力情報とを付加したデータパケットを送信するステップをさらに含む請求項１記載の無線通信方法。 The radio communication method according to claim 1, further comprising a step of transmitting a data packet in which the first radio station adds reception power information of the second control signal and interference power information in the own station. 前記第２の制御信号の受信電力情報と、自局における干渉電力情報とを付加したデータパケットを受信した第３の無線局が、パケットの送信を行う前に前記データパケットに付加された情報を元にパケットの同時送信が可能かどうかの判定を行うステップをさらに含む請求項４記載の無線通信方法。 The third wireless station that has received the data packet to which the received power information of the second control signal and the interference power information in its own station have added information added to the data packet before transmitting the packet. 5. The wireless communication method according to claim 4, further comprising a step of determining whether or not simultaneous transmission of packets is possible. 前記第１の制御信号がＲＴＳパケットであることを特徴とする請求項１記載の無線通信方法。 The wireless communication method according to claim 1, wherein the first control signal is an RTS packet. 前記第２の制御信号がＣＴＳパケットであることを特徴とする請求項１記載の無線通信方法。 The wireless communication method according to claim 1, wherein the second control signal is a CTS packet. 前記第１の無線局が、前記第１の制御信号を送信する前に前記第２の無線局からの送信信号を受信していない場合には、前記第２の制御信号の受信電力情報と、自局における干渉電力情報とを付加したデータパケットを送信するステップをさらに含む請求項２記載の無線通信方法。 When the first radio station has not received a transmission signal from the second radio station before transmitting the first control signal, the received power information of the second control signal; The wireless communication method according to claim 2, further comprising a step of transmitting a data packet to which interference power information at the local station is added. 前記第１の制御信号を受信した第３の無線局が、前記第１の制御信号に前記第２の無線局からの送信信号の受信電力情報が無い場合には、前記データパケットの送信予定時刻まで送信を待機するステップをさらに含む請求項８記載の無線通信方法。 When the third radio station that has received the first control signal does not have the received power information of the transmission signal from the second radio station in the first control signal, the scheduled transmission time of the data packet The wireless communication method according to claim 8, further comprising the step of waiting for transmission. 前記第３の無線局は、制御パケットに記載された情報から算出される信号受信電力と干渉電力の比に基づいて同時送信が可能かどうかの判定を行う請求項１記載の無線通信方法。 The radio communication method according to claim 1, wherein the third radio station determines whether simultaneous transmission is possible based on a ratio of signal reception power and interference power calculated from information described in a control packet.
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