JP2000174678A - Radio communication system - Google Patents
Radio communication systemInfo
- Publication number
- JP2000174678A JP2000174678A JP10350243A JP35024398A JP2000174678A JP 2000174678 A JP2000174678 A JP 2000174678A JP 10350243 A JP10350243 A JP 10350243A JP 35024398 A JP35024398 A JP 35024398A JP 2000174678 A JP2000174678 A JP 2000174678A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- reception quality
- transmission
- reception
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は無線通信システムに
関し、特にアンテナ特性の切り替え機能を備えた無線通
信システムに関するものである。The present invention relates to a radio communication system, and more particularly to a radio communication system having a function of switching antenna characteristics.
【０００２】[0002]
【従来の技術】従来より、無線通信システムにおいて通
信品質を向上させる技術として、ダイバーシティ技術
（単にダイバーシティともいう）が知られている。この
ダイバーシティ技術には、受信ダイバーシティと送信ダ
イバーシティがある。受信ダイバーシティは、受信状態
が最も良くなるように受信アンテナを選択して切り替え
たり、アンテナの指向性を最適にしたり、あるいは各ア
ンテナからの信号を合成する方式であり、移動体通信シ
ステムにおいて広く用いられている。一方、送信ダイバ
ーシティは、相手側の無線局に電波がよく届くように自
局のアンテナ系から電波を送信する方式である。具体的
には、送信するアンテナを選択して切り替えたり、ある
いは複数のアンテナを使用して、相手側の無線局の方向
に強い指向性が形成されるように制御する。この場合、
相手側無線局の方向は相手側無線局からの受信電波の到
来方向にもとづいて特定する。2. Description of the Related Art Hitherto, a diversity technique (also referred to simply as diversity) has been known as a technique for improving communication quality in a wireless communication system. This diversity technology includes reception diversity and transmission diversity. Reception diversity is a method of selecting and switching a reception antenna so that the reception state is best, optimizing the directivity of the antenna, or combining signals from each antenna, and is widely used in mobile communication systems. Have been. On the other hand, transmission diversity is a system in which radio waves are transmitted from an antenna system of the local station so that the radio waves can reach a radio station on the other side. Specifically, control is performed such that a transmitting antenna is selected and switched, or a plurality of antennas are used so that a strong directivity is formed in the direction of the wireless station on the partner side. in this case,
The direction of the partner wireless station is specified based on the arrival direction of the received radio wave from the partner wireless station.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記送信ダイ
バーシティでは、上述のように相手側無線局からの受信
電波の到来方向にもとづいて相手側無線局の方向を特定
しているので、送信周波数と受信周波数とが異なってい
る場合には、受信電波の到来方向に対して送信しても必
ずしも相手側無線局にとって最適な伝搬状態になるとは
限らず、期待どおりの結果が得られない場合がある。However, in the above-mentioned transmission diversity, since the direction of the partner radio station is specified based on the arrival direction of the received radio wave from the partner radio station as described above, the transmission frequency and When the reception frequency is different, even if transmission is performed in the direction of arrival of the received radio wave, the propagation state is not always optimal for the partner radio station, and an expected result may not be obtained in some cases. .
【０００４】本発明はこのような問題を解決するために
なされたもので、その目的は、相手側無線局の方向を特
定することなく良好な通信状態を確保できる無線通信シ
ステムを提供することにある。The present invention has been made to solve such a problem, and an object of the present invention is to provide a wireless communication system capable of securing a good communication state without specifying a direction of a partner wireless station. is there.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するため、相互に無線信号を送受信する第１および第
２の無線局を含み、前記第１の無線局は複数のアンテナ
特性を切り替えて送受信可能なアンテナ装置を備えた無
線通信システムであって、前記第２の無線局は、受信信
号の受信品質を測定する受信側受信品質測定部と、前記
受信側受信品質測定部の測定結果に係わる信号を前記第
１の無線局に送信する制御信号送信手段とを備え、前記
第１の無線局は、前記第２の無線局から受信した信号よ
り前記受信側受信品質測定部の測定結果に係わる信号を
抽出する信号抽出手段と、前記アンテナ装置の受信アン
テナ特性を切り替えて受信信号の受信品質を測定し、も
っとも良好な受信品質が得られるアンテナ特性を特定す
る送信側受信品質測定部と、前記アンテナ装置の送信ア
ンテナ特性を、前記送信側受信品質測定部が特定した前
記アンテナ特性に相当する送信アンテナ特性に切り替
え、その後、前記信号抽出手段が抽出した前記信号によ
り前記第２の無線局における受信品質の低下が判明した
場合にはもとの送信アンテナ特性または他の送信アンテ
ナ特性に切り替えるアンテナ特性制御手段とを備えたこ
とを特徴とする。In order to achieve the above object, the present invention includes first and second radio stations for mutually transmitting and receiving radio signals, wherein the first radio station has a plurality of antenna characteristics. What is claimed is: 1. A wireless communication system including an antenna device capable of switching transmission and reception, wherein said second wireless station measures a reception quality measurement unit for measuring reception quality of a reception signal, and a measurement performed by said reception quality measurement unit. Control signal transmitting means for transmitting a signal relating to a result to the first wireless station, wherein the first wireless station measures the reception-side reception quality measurement unit based on a signal received from the second wireless station. A signal extraction unit for extracting a signal related to the result, and a transmission side reception quality for measuring a reception quality of a reception signal by switching a reception antenna characteristic of the antenna device and specifying an antenna characteristic for obtaining the best reception quality. And the transmitting antenna characteristic of the antenna device is switched to a transmitting antenna characteristic corresponding to the antenna characteristic specified by the transmitting-side reception quality measuring unit, and then the second signal is extracted by the signal extracting unit. Antenna characteristic control means for switching to the original transmission antenna characteristic or another transmission antenna characteristic when a decrease in reception quality at the wireless station is found.
【０００６】本発明の無線通信システムでは、送信側受
信品質測定部は、アンテナ装置の受信アンテナ特性を切
り替えて受信信号の受信品質を測定し、もっとも良好な
受信品質が得られるアンテナ特性を特定する。そして、
アンテナ特性制御手段は、アンテナ装置の送信アンテナ
特性を、送信側受信品質測定部が特定した前記アンテナ
特性に相当する送信アンテナ特性に切り替え、その後、
信号抽出手段が抽出した前記信号により第２の無線局に
おける受信品質の低下が判明した場合には、もとの送信
アンテナ特性または他の送信アンテナ特性に切り替え
る。すなわち、本発明では、相手側無線局に対して良好
な送信状態を確保すべく、もっとも良好な受信品質が得
られるアンテナ特性に相当する送信アンテナ特性を選択
して送信が行われ、その際、もし送信アンテナ特性の切
り替えによりかえって相手側無線局での受信品質が低下
した場合には、もとの送信アンテナ特性または他の送信
アンテナ特性にすみやかに切り替えられる。In the radio communication system according to the present invention, the transmission-side reception quality measurement section switches the reception antenna characteristics of the antenna device, measures the reception quality of the reception signal, and specifies the antenna characteristic that provides the best reception quality. . And
The antenna characteristic control unit switches the transmission antenna characteristic of the antenna device to a transmission antenna characteristic corresponding to the antenna characteristic specified by the transmission-side reception quality measurement unit,
When it is determined that the reception quality of the second wireless station is reduced by the signal extracted by the signal extraction unit, the signal is switched to the original transmission antenna characteristic or another transmission antenna characteristic. That is, in the present invention, transmission is performed by selecting a transmission antenna characteristic corresponding to an antenna characteristic that provides the best reception quality, in order to ensure a good transmission state for the partner wireless station. If the reception quality at the partner wireless station is reduced by switching the transmission antenna characteristic, the transmission characteristic can be immediately switched to the original transmission antenna characteristic or another transmission antenna characteristic.
【０００７】また、本発明は、相互に無線信号を送受信
する第１および第２の無線局を含み、前記第１の無線局
は複数のアンテナ特性を切り替えて送受信可能なアンテ
ナ装置を備えた無線通信システムであって、前記第２の
無線局は、受信信号の受信品質を測定する受信側受信品
質測定部と、前記受信側受信品質測定部の測定結果に係
わる信号を前記第１の無線局に送信する制御信号送信手
段とを備え、前記第１の無線局は、前記第２の無線局か
ら受信した信号より前記受信側受信品質測定部の測定結
果に係わる信号を抽出する信号抽出手段と、前記アンテ
ナ装置の送信アンテナ特性を定期的に切り替え、送信ア
ンテナ特性を切り替えた後、前記信号抽出手段が抽出し
た前記信号により前記第２の無線局における受信品質の
低下が判明した場合にはもとの送信アンテナ特性または
他の送信アンテナ特性に切り替えるアンテナ特性制御手
段とを備えたことを特徴とする。Further, the present invention includes first and second radio stations for mutually transmitting and receiving radio signals, wherein the first radio station is provided with a radio apparatus having an antenna device capable of transmitting and receiving by switching a plurality of antenna characteristics. In the communication system, the second radio station measures a reception quality measurement unit for measuring reception quality of a reception signal, and transmits a signal related to a measurement result of the reception quality measurement unit to the first radio station. A signal extracting means for extracting a signal related to a measurement result of the receiving-side reception quality measuring unit from a signal received from the second wireless station. After the transmission antenna characteristics of the antenna device are periodically switched and the transmission antenna characteristics are switched, it is determined that the reception quality of the second wireless station is lowered by the signal extracted by the signal extraction unit. Characterized by comprising an antenna characteristic control means for switching to the original transmitting antenna characteristics or other transmitting antenna characteristics to.
【０００８】本発明の無線通信システムでは、アンテナ
特性制御手段は、アンテナ装置の送信アンテナ特性を定
期的に切り替え、送信アンテナ特性を切り替えた後、信
号抽出手段が抽出した前記信号により第２の無線局にお
ける受信品質の低下が判明した場合にはもとの送信アン
テナ特性または他の送信アンテナ特性に切り替える。す
なわち、本発明では、相手側無線局に対して良好な送信
状態を確保すべく、アンテナ装置の送信アンテナ特性を
定期的に切り替え、その際、もし送信アンテナ特性の切
り替えによりかえって相手側無線局での受信品質が低下
した場合には、もとの送信アンテナ特性または他の送信
アンテナ特性にすみやかに切り替えられる。In the wireless communication system according to the present invention, the antenna characteristic control means periodically switches the transmission antenna characteristics of the antenna device, switches the transmission antenna characteristics, and then switches the second antenna based on the signal extracted by the signal extraction means. When it is found that the reception quality has decreased in the station, the station switches to the original transmission antenna characteristic or another transmission antenna characteristic. That is, in the present invention, the transmission antenna characteristic of the antenna device is periodically switched in order to secure a favorable transmission state for the other party's wireless station. If the reception quality of the transmission antenna deteriorates, it is immediately switched to the original transmission antenna characteristic or another transmission antenna characteristic.
【０００９】[0009]
【発明の実施の形態】次に本発明の実施の形態例につい
て図面を参照して説明する。図１は本発明による無線通
信システムの一例を示すブロック図、図２は図１の無線
通信システムの動作を示すフローチャートである。図１
に示したように、無線通信システム２は、相互に無線信
号を送受信する第１および第２の無線局４、６を含み、
第１の無線局４は例えば基地局であり、第２の無線局６
は例えば移動局である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the wireless communication system according to the present invention, and FIG. 2 is a flowchart showing the operation of the wireless communication system of FIG. FIG.
As shown in, the wireless communication system 2 includes first and second wireless stations 4 and 6 that mutually transmit and receive wireless signals,
The first wireless station 4 is, for example, a base station, and the second wireless station 6
Is, for example, a mobile station.
【００１０】第１の無線局４は複数のアンテナ特性に切
り替えて送受信可能なアンテナ装置８を備え、アンテナ
装置８は本実施の形態例では送信アンテナ系１０と受信
アンテナ系１２とを含み、送信アンテナ系１０は一例と
して第１および第２の送信アンテナ特性を切り替えるこ
とができ、受信アンテナ系１２も同様に一例として第１
および第２の受信アンテナ特性を切り替えることができ
る。ここでは、アンテナ特性はアンテナの指向特性であ
るとし、第１の送信アンテナ特性および第１の受信アン
テナ特性は同一の指向特性であり、第２の送信アンテナ
特性および第２の受信アンテナ特性も同一の指向特性で
あるとする。The first wireless station 4 includes an antenna device 8 capable of switching between a plurality of antenna characteristics and transmitting and receiving. In this embodiment, the antenna device 8 includes a transmitting antenna system 10 and a receiving antenna system 12, The antenna system 10 can switch the first and second transmission antenna characteristics as an example, and the reception antenna system 12 can also switch the first and second transmission antenna characteristics as an example.
And the second receiving antenna characteristic can be switched. Here, it is assumed that the antenna characteristic is the directional characteristic of the antenna, the first transmitting antenna characteristic and the first receiving antenna characteristic are the same directional characteristic, and the second transmitting antenna characteristic and the second receiving antenna characteristic are also the same. Directional characteristic.
【００１１】第２の無線局６は、アンテナ１４およびサ
ーキュレータ１６を備え、さらに受信に係わる構成要素
として受信部１８、受信品質測定部２０、ならびに制御
信号発生部２２を含んでいる。また、送信に係わる構成
要素としてさらに送信部２４および合成部２６を含んで
いる。第２の無線局６の受信部１８は第１の無線局４か
らの無線信号をアンテナ１４およびサーキュレータ１６
を通じて受信し、受信情報Ｒ２を抽出して出力する。そ
して、受信品質測定部２０は受信部１８が受信した信号
の受信品質を測定する。具体的には、受信品質測定部２
０は、電界強度、ビットエラーレート、ＳＩＲ（Signal
Interference Ratio）のいずれか１つまたは複数にも
とづいて受信品質を測定し、測定結果を数値で表してそ
の信号を出力する。The second radio station 6 includes an antenna 14 and a circulator 16, and further includes a reception unit 18, a reception quality measurement unit 20, and a control signal generation unit 22 as components related to reception. Further, a transmission unit 24 and a synthesis unit 26 are further included as components related to transmission. The receiving unit 18 of the second wireless station 6 transmits the wireless signal from the first wireless station 4 to the antenna 14 and the circulator 16.
, And extracts and outputs the reception information R2. Then, the reception quality measurement unit 20 measures the reception quality of the signal received by the reception unit 18. Specifically, the reception quality measurement unit 2
0 is electric field strength, bit error rate, SIR (Signal
The reception quality is measured based on one or more of the interference ratios, the measurement result is represented by a numerical value, and the signal is output.
【００１２】制御信号発生部２２は、受信品質測定部２
０が出力するこの測定結果を表す信号をもとに、送信電
力制御信号を発生する。第２の無線局６は不図示の送信
電力制御手段（本発明に係わる第２の送信電力制御手
段）を有し、送信電力制御信号はこの送信電力制御手段
に供給される。送信電力制御手段は送信電力制御信号に
もとづいて送信部２４を制御し、受信品質が低い場合に
は送信電力を高めさせ、一方、受信品質が高い場合には
送信電力を低下させる。[0012] The control signal generator 22 is provided with the reception quality measuring unit 2.
A transmission power control signal is generated on the basis of a signal output from the unit and indicating the measurement result. The second wireless station 6 has transmission power control means (not shown) (second transmission power control means according to the present invention), and a transmission power control signal is supplied to the transmission power control means. The transmission power control means controls the transmission section 24 based on the transmission power control signal, and increases the transmission power when the reception quality is low, and decreases the transmission power when the reception quality is high.
【００１３】制御信号発生部２２が発生した送信電力制
御信号はまた受信品質測定部２０の測定結果に係わる信
号として合成部２６に供給され、合成部２６は、送信情
報Ｔ２と送信電力制御信号とを合成して送信部２４に出
力する。送信部２４はこの合成信号をサーキュレータ１
６およびアンテナ１４を通じて第１の無線局４に送信す
る。制御信号発生部２２、合成部２６、ならびに送信部
２４などが本発明に係わる制御信号送信手段を構成して
いる。The transmission power control signal generated by the control signal generation unit 22 is also supplied to the combining unit 26 as a signal related to the measurement result of the reception quality measuring unit 20, and the combining unit 26 transmits the transmission information T2, the transmission power control signal, Are combined and output to the transmission unit 24. The transmitting unit 24 transmits the synthesized signal to the circulator 1
6 and the antenna 14 to the first wireless station 4. The control signal generation unit 22, the synthesis unit 26, the transmission unit 24, and the like constitute a control signal transmission unit according to the present invention.
【００１４】一方、第１の無線局４は、受信に係わる構
成要素として受信部２８、受信品質測定部３０、分離部
３２、ならびに制御信号読取部３４を含み、一方、送信
に係わる構成要素としてアンテナ制御部３６、送信部３
８、送信制御部４０を含んでいる。受信部２８は受信ア
ンテナ系１２を通じて第２の無線局６からの無線信号を
受信し、分離部３２はこの信号より受信情報Ｒ１を抽出
する。そして、制御信号読取部３４は本発明に係わる信
号抽出手段として機能し、分離部３２が出力する受信信
号より第１の無線局４からの送信電力制御信号を抽出す
る。On the other hand, the first radio station 4 includes a receiving unit 28, a reception quality measuring unit 30, a separating unit 32, and a control signal reading unit 34 as components related to reception, and as components related to transmission. Antenna control unit 36, transmitting unit 3
8, the transmission control unit 40 is included. The receiving unit 28 receives a wireless signal from the second wireless station 6 through the receiving antenna system 12, and the separating unit 32 extracts received information R1 from this signal. Then, the control signal reading unit 34 functions as a signal extracting unit according to the present invention, and extracts the transmission power control signal from the first wireless station 4 from the received signal output by the separating unit 32.
【００１５】また、受信品質測定部３０は受信部２８の
出力信号にもとづいて、上記受信品質測定部２０と同様
に受信信号の受信品質を測定する。そして、受信品質測
定部３０は受信アンテナ系１２の受信アンテナ特性を切
り替えて受信信号の受信品質を測定し、もっとも良好な
受信品質が得られるアンテナ特性を特定する。送信部３
８は、与えられた送信情報Ｔ１を送信アンテナ系１０を
通じて第２の無線局６へ送信する。送信制御部４０は本
発明に係わるアンテナ特性制御手段を構成し、送信アン
テナ系１０の送信アンテナ特性を、受信品質測定部３０
が特定した前記アンテナ特性に相当する送信アンテナ特
性に切り替える。そして、アンテナ特性を切り替えた
後、制御信号読取部３４が抽出した送信電力制御信号に
より第２の無線局６における受信品質の低下が判明した
場合にはもとの送信アンテナ特性（または送信アンテナ
特性が３種類以上の場合は他のアンテナ特性）に切り替
える。The reception quality measuring section 30 measures the reception quality of the received signal based on the output signal of the receiving section 28 in the same manner as the reception quality measuring section 20 described above. Then, the reception quality measurement unit 30 switches the reception antenna characteristics of the reception antenna system 12 to measure the reception quality of the reception signal, and specifies the antenna characteristic that provides the best reception quality. Transmission section 3
8 transmits the given transmission information T1 to the second wireless station 6 through the transmission antenna system 10. The transmission control unit 40 constitutes an antenna characteristic control unit according to the present invention, and transmits the transmission antenna characteristics of the transmission antenna system 10 to the reception quality measurement unit 30.
Switch to transmission antenna characteristics corresponding to the specified antenna characteristics. Then, after switching the antenna characteristics, if it is determined that the reception quality of the second wireless station 6 is degraded by the transmission power control signal extracted by the control signal reading unit 34, the original transmission antenna characteristics (or the transmission antenna characteristics). If there are three or more types, switch to another antenna characteristic).
【００１６】また、送信制御部４０は、受信品質測定部
３０による受信品質の測定結果にもとづいて、送信部３
８を制御し、その送信電力を制御する。すなわち、受信
品質が良好な場合には送信電力を低下させ、逆に受信品
質が低い場合には送信電力を強めさせる。このとき受信
品質測定部３０は本発明に係わる第２の送信側受信品質
測定部として機能する。なお、アンテナ装置８を構成す
るアンテナ制御部３６は、送信制御部４０による制御に
もとづいて、送信アンテナ系１０の送信アンテナ特性を
切り替える。Further, the transmission control unit 40, based on the reception quality measurement result of the reception quality measurement unit 30,
8 and its transmission power. That is, when the reception quality is good, the transmission power is reduced, and when the reception quality is low, the transmission power is increased. At this time, the reception quality measurement unit 30 functions as a second transmission-side reception quality measurement unit according to the present invention. Note that the antenna control unit 36 included in the antenna device 8 switches the transmission antenna characteristics of the transmission antenna system 10 based on the control by the transmission control unit 40.
【００１７】次に、このように構成された無線通信シス
テム２の動作について図２のフローチャートをも参照し
つつ説明する。受信品質測定部３０は、詳しくは、上記
第１および第２の受信アンテナ特性に切り替えた場合の
受信品質をほぼ一定の時間間隔で測定し、所定回数ｎ
（ｎは正の整数）の測定において最良の受信品質が得ら
れた受信アンテナ特性を前記もっとも良好な受信品質が
得られるアンテナ特性とする。Next, the operation of the wireless communication system 2 configured as described above will be described with reference to the flowchart of FIG. More specifically, the reception quality measurement unit 30 measures the reception quality when switching to the first and second reception antenna characteristics at substantially constant time intervals, and performs the predetermined number n
(N is a positive integer) in the measurement of the reception antenna characteristic that provides the best reception quality is the antenna characteristic that provides the best reception quality.
【００１８】例えば、第１の送信アンテナ特性で送信が
行われている状態で、第１の受信アンテナ特性ではな
く、第２の受信アンテナ特性で連続してｎ回より良好な
受信品質が得られた場合には（ステップＳ１）、第２の
受信アンテナ特性をもっとも良好な受信品質が得られる
アンテナ特性とする。したがって、このとき送信制御部
４０は、アンテナ制御部３６を制御して、送信アンテナ
系１０の特性を、第２の受信アンテナ特性と同じ指向特
性の第２の送信アンテナ特性に切り替える（ステップＳ
２）。以降、送信部からの信号は第２の送信アンテナ特
性で第２の無線局６に向け送信されることになる。な
お、ステップＳ１で判定結果がＮｏであった場合には、
送信制御部４０はアンテナ特性の切り替えは行わず、受
信品質測定部３０はステップＳ１の判定動作を繰り返す
ことになる。For example, in a state where transmission is being performed with the first transmission antenna characteristic, better reception quality than n times can be continuously obtained not with the first reception antenna characteristic but with the second reception antenna characteristic. In this case (step S1), the second receiving antenna characteristic is set as the antenna characteristic that provides the best reception quality. Therefore, at this time, the transmission control unit 40 controls the antenna control unit 36 to switch the characteristics of the transmission antenna system 10 to the second transmission antenna characteristics having the same directional characteristics as the second reception antenna characteristics (Step S
2). Thereafter, the signal from the transmission unit is transmitted to the second wireless station 6 with the second transmission antenna characteristic. If the result of the determination in step S1 is No,
The transmission control unit 40 does not switch the antenna characteristics, and the reception quality measurement unit 30 repeats the determination operation of step S1.
【００１９】そして、第２の無線局６では、上記第２の
送信アンテナ特性で送信された無線信号を受信部が受信
し、受信品質測定部２０はその信号により受信品質を測
定する。さらに、制御信号発生部２２は受信品質の測定
結果にもとづいて送信電力制御信号を発生し、この制御
信号は、合成部２６および送信部２４を通じて第１の無
線局４に送られる。In the second radio station 6, the receiving unit receives the radio signal transmitted with the second transmission antenna characteristic, and the reception quality measuring unit 20 measures the reception quality based on the signal. Further, the control signal generator 22 generates a transmission power control signal based on the measurement result of the reception quality, and the control signal is transmitted to the first wireless station 4 through the synthesizer 26 and the transmitter 24.
【００２０】第２の無線局６では、この送信電力制御信
号は受信部２８および分離部３２を介して制御信号読取
部３４に供給され、制御信号読取部３４は受信信号に含
まれる送信電力制御信号を抽出して送信制御部４０に出
力する。送信制御部４０は、上述のようにアンテナ特性
を切り替えた後、この送信電力制御信号を監視し、アン
テナ特性切り替え後の一定の時間Ｔ内に、送信電力の基
準変化値Ａ［ｄＢ］を越えて送信電力が上昇したか否か
を判定する（ステップＳ３）。In the second radio station 6, the transmission power control signal is supplied to the control signal reading section 34 via the receiving section 28 and the separating section 32, and the control signal reading section 34 transmits the transmission power control signal included in the received signal. The signal is extracted and output to the transmission control unit 40. After switching the antenna characteristics as described above, the transmission control unit 40 monitors this transmission power control signal, and exceeds a reference change value A [dB] of the transmission power within a certain time T after the antenna characteristics are switched. Then, it is determined whether the transmission power has increased (step S3).
【００２１】そして、この判定結果がＮｏの場合には、
第２の無線局６における受信品質が向上したことになる
ので、送信部制御部は第２の送信アンテナ特性を維持
し、このアンテナ特性で良好な通信が行われることにな
る。一方、ステップＳ３における判定結果がＮｏであっ
た場合には、送信アンテナ特性を切り替えたことで第２
の無線局６における受信品質がかえって低下したことに
なるので、送信制御部４０は、アンテナ制御部３６を制
御して送信アンテナ系１０のアンテナ特性を第１の送信
アンテナ特性に戻させる（ステップＳ４）。If the result of this determination is No,
Since the reception quality at the second wireless station 6 is improved, the transmission unit control unit maintains the second transmission antenna characteristic, and good communication is performed with this antenna characteristic. On the other hand, if the determination result in step S3 is No, the second
The transmission control unit 40 controls the antenna control unit 36 to return the antenna characteristic of the transmission antenna system 10 to the first transmission antenna characteristic (step S4). ).
【００２２】すなわち、本実施の形態例の無線通信シス
テム２では、相手側無線局に対して良好な送信状態を確
保すべく、もっとも良好な受信品質が得られるアンテナ
特性に相当する送信アンテナ特性を選択して送信が行わ
れ、その際、もし送信アンテナ特性の切り替えによりか
えって相手側無線局での受信品質が低下した場合には、
もとの送信アンテナ特性または他の送信アンテナ特性に
すみやかに切り替えられる。したがって、本実施の形態
例の無線通信システム２では、第１の無線局４において
送信周波数と受信周波数とが異なっていても、従来のよ
うに受信電波により相手側無線局の方向を特定する必要
がないので、送受信周波数の違いはいっさい障害となら
ず、良好な通信状態を確保することができる。そして、
アンテナ特性の最適化により送信電力を平均して低下さ
せることができ、消費電力の低減を図ることができると
共に、他の無線局に対する干渉も抑制することができ
る。That is, in the radio communication system 2 of the present embodiment, in order to secure a good transmission state for the partner radio station, the transmission antenna characteristic corresponding to the antenna characteristic that provides the best reception quality is set. The transmission is performed selectively, and at this time, if the reception quality at the partner radio station is reduced by switching the transmission antenna characteristic,
Switching to the original transmission antenna characteristic or another transmission antenna characteristic can be immediately performed. Therefore, in the wireless communication system 2 of the present embodiment, even if the transmission frequency and the reception frequency are different in the first wireless station 4, it is necessary to specify the direction of the partner wireless station by the received radio wave as in the related art. Since there is no difference, a difference in transmission / reception frequency does not cause any obstacle, and a good communication state can be ensured. And
By optimizing the antenna characteristics, transmission power can be reduced on average, power consumption can be reduced, and interference with other wireless stations can be suppressed.
【００２３】本実施の形態例ではアンテナ特性は２種類
であるとしたが、３種類以上の場合にも、受信品質測定
部３０は各受信アンテナ特性を順番に切り替えて受信品
質を測定し、もっとも良好なアンテナ特性を特定すれば
よく、送信制御部４０はその結果にしたがって送信アン
テナ特性を設定することができる。In the present embodiment, it is assumed that there are two types of antenna characteristics. However, in the case of three or more types, the reception quality measurement unit 30 measures the reception quality by sequentially switching the reception antenna characteristics. What is necessary is just to specify good antenna characteristics, and the transmission control unit 40 can set the transmission antenna characteristics according to the result.
【００２４】その際、最良の受信アンテナ特性と同じ送
信アンテナ特性に設定して第１の無線局４の送信電力が
時間Ｔ内にＡ［ｄＢ］を越えて上昇してしまった場合に
は、２番目に良好なアンテナ特性を設定する方式にする
ことも可能である。あるいは、上記最良であるとして選
択したアンテナ特性は一定時間除外し、それ以外のアン
テナ特性のなかで最良のものを選択するようにしてもよ
い。At this time, if the transmission antenna characteristic is set to the same as the best reception antenna characteristic and the transmission power of the first wireless station 4 rises beyond A [dB] within the time T, It is also possible to adopt a method of setting the second best antenna characteristics. Alternatively, the antenna characteristics selected as the best may be excluded for a certain period of time, and the best antenna characteristics may be selected from the other antenna characteristics.
【００２５】さらに、第１の無線局４の送信電力が時間
Ｔ内にＡ［ｄＢ］を越えて上昇したか否かのチェック期
間中であっても、受信特性に大きな変化があった場合
や、ある受信アンテナ特性が現在設定されている受信ア
ンテナ特性よりｎ回良い状態がつづいた場合には送信ア
ンテナ特性の見直しを行う構成とすることも可能であ
る。Further, even during the check period of whether or not the transmission power of the first wireless station 4 has exceeded A [dB] within the time T, if there is a large change in the reception characteristics, Alternatively, when a certain receiving antenna characteristic continues to be better than the currently set receiving antenna characteristic by n times, the transmission antenna characteristic may be reviewed.
【００２６】また、受信品質測定部３０が、各受信アン
テナ特性に切り替えた場合の前記受信品質をほぼ一定の
時間間隔で測定し、連続する特定の回数ｍ（ｎより大き
い正の整数）の測定において最良の受信品質が得られた
回数ｎがもっとも多い受信アンテナ特性を前記もっとも
良好な受信品質が得られるアンテナ特性とする方式にす
ることも可能である。The reception quality measuring section 30 measures the reception quality when switching to each reception antenna characteristic at substantially constant time intervals, and measures a specific number m (a positive integer larger than n) of successive times. It is also possible to adopt a method in which the receiving antenna characteristic with the largest number of times n at which the best reception quality is obtained is used as the antenna characteristic at which the best reception quality is obtained.
【００２７】さらに、本実施の形態例では、アンテナ装
置８は受信アンテナ系１２と送信アンテナ系１０とを備
えているとしたが、同一のアンテナを受信用および送信
用のアンテナとして共用する構成にすることも可能であ
る。なお、受信品質測定部３０において良好な受信アン
テナ特性を判定する際に、信号強度などの大小を比較す
る以外にも、一定期間中に、異なる受信アンテナ特性で
受信した信号の例えば強度などの差があるレベル以上に
なった回数によりどの受信アンテナ特性が良好かを判定
することも可能である。Further, in the present embodiment, the antenna device 8 is provided with the receiving antenna system 12 and the transmitting antenna system 10, but the same antenna is commonly used as a receiving antenna and a transmitting antenna. It is also possible. When determining good reception antenna characteristics in the reception quality measurement unit 30, besides comparing the magnitude of the signal strength and the like, the difference between the signals received with different reception antenna characteristics during a certain period, for example, the difference in the intensity is considered. It is also possible to determine which reception antenna characteristic is good based on the number of times that a certain level or more is reached.
【００２８】次に、本発明の第２の実施の形態例につい
て説明する。第２の実施の形態例が上記実施の形態例と
異なるのは、図１に示した無線通信システム２において
送信制御部４０の機能の点である。図３は第２の実施の
形態例の動作を示すフローチャートであり、この図を参
照して第２の実施の形態例において特に送信制御部４０
がどのように動作するかについて詳しく説明する。ま
ず、第１の無線局４が第１の送信アンテナ特性で送信を
行っているものとする。この状態で、送信制御部４０は
前回アンテナの特性を切り替えた後一定の時間が経過し
たか判定する（ステップＳ１１）。判定結果がＹｅｓの
場合には、送信制御部４０はアンテナ制御部３６を制御
して送信アンテナ特性を第２の送信アンテナ特性に変更
する（ステップＳ１２）。変更後、第２の無線局６から
の送信電力制御信号により第１の無線局４の送信電力が
時間Ｔ内にＡ［ｄＢ］を越えて上昇したか否かを判定す
る（スイッチＳ１３）。そして、判定結果がＮｏの場合
は第２の送信アンテナ特性を継続し、一方、判定結果が
Ｙｅｓの場合には、送信アンテナ特性を第２の送信アン
テナ特性に設定したことで第２の無線局６における受信
品質が低下したことになるので、アンテナ特性をもとの
第１の送信アンテナ特性に戻す（ステップＳ１４）。Next, a second embodiment of the present invention will be described. The second embodiment differs from the above embodiment in the function of the transmission control unit 40 in the wireless communication system 2 shown in FIG. FIG. 3 is a flowchart showing the operation of the second embodiment. Referring to FIG. 3, the transmission control unit 40 in the second embodiment is particularly described.
Will be described in detail. First, it is assumed that the first wireless station 4 is transmitting with the first transmission antenna characteristic. In this state, the transmission control unit 40 determines whether or not a predetermined time has elapsed since the last time the antenna characteristics were switched (step S11). If the determination result is Yes, the transmission control unit 40 controls the antenna control unit 36 to change the transmission antenna characteristics to the second transmission antenna characteristics (Step S12). After the change, it is determined based on the transmission power control signal from the second wireless station 6 whether the transmission power of the first wireless station 4 has increased beyond A [dB] within the time T (switch S13). When the determination result is No, the second transmission antenna characteristic is continued. On the other hand, when the determination result is Yes, the transmission antenna characteristic is set to the second transmission antenna characteristic. 6, the reception quality is reduced, and the antenna characteristics are returned to the original first transmission antenna characteristics (step S14).
【００２９】したがって、この第２の実施の形態例で
は、相手側無線局に対して良好な送信状態を確保すべ
く、アンテナ装置８の送信アンテナ特性を定期的に切り
替え、その際、もし送信アンテナ特性の切り替えにより
かえって相手側無線局での受信品質が低下した場合に
は、もとの送信アンテナ特性または他の送信アンテナ特
性にすみやかに切り替えられる。そのため、この第２の
実施の形態例によっても、上記実施の形態例と同様の効
果が得られる。なお、この第２の実施の形態例の場合に
もアンテナ特性は３種類以上であってもよく、各アンテ
ナを順次切り替えることで基本的に同様に動作して良好
な通信状態を確保することができる。Therefore, in the second embodiment, the transmission antenna characteristic of the antenna device 8 is periodically switched in order to secure a favorable transmission state for the partner radio station. If the reception quality at the partner radio station is degraded due to the switching of the characteristics, switching to the original transmission antenna characteristics or another transmission antenna characteristic is immediately performed. Therefore, according to the second embodiment, effects similar to those of the above-described embodiment can be obtained. In the case of the second embodiment as well, the antenna characteristics may be three or more types. By switching each antenna sequentially, basically the same operation is performed and a good communication state is ensured. it can.
【００３０】[0030]
【発明の効果】以上説明したように本発明の無線通信シ
ステムでは、送信側受信品質測定部は、アンテナ装置の
受信アンテナ特性を切り替えて受信信号の受信品質を測
定し、もっとも良好な受信品質が得られるアンテナ特性
を特定する。そして、アンテナ特性制御手段は、アンテ
ナ装置の送信アンテナ特性を、送信側受信品質測定部が
特定した前記アンテナ特性に相当する送信アンテナ特性
に切り替え、その後、信号抽出手段が抽出した前記信号
により第２の無線局における受信品質の低下が判明した
場合には、もとの送信アンテナ特性または他の送信アン
テナ特性に切り替える。すなわち、本発明では、相手側
無線局に対して良好な送信状態を確保すべく、もっとも
良好な受信品質が得られるアンテナ特性に相当する送信
アンテナ特性を選択して送信が行われ、その際、もし送
信アンテナ特性の切り替えによりかえって相手側無線局
での受信品質が低下した場合には、もとの送信アンテナ
特性または他の送信アンテナ特性にすみやかに切り替え
られる。As described above, in the radio communication system according to the present invention, the transmission-side reception quality measurement unit measures the reception quality of the reception signal by switching the reception antenna characteristics of the antenna device. Specify the antenna characteristics to be obtained. Then, the antenna characteristic control unit switches the transmission antenna characteristic of the antenna device to a transmission antenna characteristic corresponding to the antenna characteristic specified by the transmission-side reception quality measurement unit, and thereafter, the second signal is extracted by the signal extraction unit. If it is determined that the reception quality of the wireless station has deteriorated, switching to the original transmission antenna characteristic or another transmission antenna characteristic is performed. That is, in the present invention, transmission is performed by selecting a transmission antenna characteristic corresponding to an antenna characteristic that provides the best reception quality, in order to ensure a good transmission state for the partner wireless station. If the reception quality at the other end of the wireless station is degraded by switching the transmission antenna characteristic, the transmission antenna characteristic can be immediately switched to the original transmission antenna characteristic or another transmission antenna characteristic.
【００３１】したがって、本発明の無線通信システムで
は、第１の無線局において送信周波数と受信周波数とが
異なっていても、従来のように受信電波により相手側無
線局の方向を特定する必要がないので、送受信周波数の
違いはいっさい障害とならず、良好な通信状態を確保す
ることができる。そして、アンテナ特性の最適化により
送信電力を平均して低下させることができ、消費電力の
低減を図ることができると共に、他の無線局に対する干
渉も抑制することができる。Therefore, in the radio communication system of the present invention, even if the transmission frequency and the reception frequency are different in the first radio station, it is not necessary to specify the direction of the partner radio station by the received radio wave as in the related art. Therefore, a difference in transmission / reception frequency does not cause any obstacle, and a good communication state can be ensured. Then, by optimizing the antenna characteristics, the transmission power can be reduced on average, the power consumption can be reduced, and interference with other wireless stations can be suppressed.
【００３２】また、本発明の無線通信システムでは、ア
ンテナ特性制御手段は、アンテナ装置の送信アンテナ特
性を定期的に切り替え、送信アンテナ特性を切り替えた
後、信号抽出手段が抽出した前記信号により第２の無線
局における受信品質の低下が判明した場合にはもとの送
信アンテナ特性または他の送信アンテナ特性に切り替え
る。すなわち、本発明では、相手側無線局に対して良好
な送信状態を確保すべく、アンテナ装置の送信アンテナ
特性を定期的に切り替え、その際、もし送信アンテナ特
性の切り替えによりかえって相手側無線局での受信品質
が低下した場合には、もとの送信アンテナ特性または他
の送信アンテナ特性にすみやかに切り替えられる。In the wireless communication system according to the present invention, the antenna characteristic control means periodically switches the transmission antenna characteristic of the antenna device, and after switching the transmission antenna characteristic, the second signal is extracted by the signal extraction means. If it is determined that the reception quality of the wireless station has deteriorated, switching to the original transmission antenna characteristic or another transmission antenna characteristic is performed. That is, in the present invention, the transmission antenna characteristic of the antenna device is periodically switched in order to secure a favorable transmission state for the other party's wireless station. If the reception quality of the transmission antenna deteriorates, it is immediately switched to the original transmission antenna characteristic or another transmission antenna characteristic.
【００３３】したがって、本発明の無線通信システムで
は、第１の無線局において送信周波数と受信周波数とが
異なっていても、従来のように受信電波により相手側無
線局の方向を特定する必要がないので、送受信周波数の
違いはいっさい障害とならず、良好な通信状態を確保す
ることができる。そして、アンテナ特性の最適化により
送信電力を平均して低下させることができ、消費電力の
低減を図ることができると共に、他の無線局に対する干
渉も抑制することができる。Therefore, in the radio communication system of the present invention, even if the transmission frequency and the reception frequency are different in the first radio station, it is not necessary to specify the direction of the partner radio station by the received radio wave as in the related art. Therefore, a difference in transmission / reception frequency does not cause any obstacle, and a good communication state can be ensured. Then, by optimizing the antenna characteristics, the transmission power can be reduced on average, the power consumption can be reduced, and interference with other wireless stations can be suppressed.
【図１】本発明による無線通信システムの一例を示すブ
ロック図である。FIG. 1 is a block diagram illustrating an example of a wireless communication system according to the present invention.
【図２】図１の無線通信システムの動作を示すフローチ
ャートである。FIG. 2 is a flowchart illustrating an operation of the wireless communication system of FIG. 1;
【図３】第２の実施の形態例の動作を示すフローチャー
トである。FIG. 3 is a flowchart showing an operation of the second embodiment.
２……無線通信システム、４……第１の無線局、６……
第２の無線局、８……アンテナ装置、１０……送信アン
テナ系、１２……受信アンテナ系、１４……アンテナ、
１６……サーキュレータ、１８……受信部、２０……受
信品質測定部、２２……制御信号発生部、２４……送信
部、２６……合成部、２８……受信部、３０……受信品
質測定部、３２……分離部、３４……制御信号読取部、
３６……アンテナ制御部、３８……送信部、４０……送
信制御部。2 ... wireless communication system, 4 ... first wireless station, 6 ...
2nd radio station, 8 antenna apparatus, 10 transmitting antenna system, 12 receiving antenna system, 14 antenna,
16 circulator, 18 receiving section, 20 receiving quality measuring section, 22 control signal generating section, 24 transmitting section, 26 combining section, 28 receiving section, 30 receiving quality Measuring unit, 32 separating unit, 34 control signal reading unit,
36 antenna control unit, 38 transmission unit, 40 transmission control unit.
Claims (10)
第２の無線局を含み、前記第１の無線局は複数のアンテ
ナ特性を切り替えて送受信可能なアンテナ装置を備えた
無線通信システムであって、 前記第２の無線局は、 受信信号の受信品質を測定する受信側受信品質測定部
と、 前記受信側受信品質測定部の測定結果に係わる信号を前
記第１の無線局に送信する制御信号送信手段とを備え、 前記第１の無線局は、 前記第２の無線局から受信した信号より前記受信側受信
品質測定部の測定結果に係わる信号を抽出する信号抽出
手段と、 前記アンテナ装置の受信アンテナ特性を切り替えて受信
信号の受信品質を測定し、もっとも良好な受信品質が得
られるアンテナ特性を特定する送信側受信品質測定部
と、 前記アンテナ装置の送信アンテナ特性を、前記送信側受
信品質測定部が特定した前記アンテナ特性に相当する送
信アンテナ特性に切り替え、その後、前記信号抽出手段
が抽出した前記信号により前記第２の無線局における受
信品質の低下が判明した場合にはもとの送信アンテナ特
性または他の送信アンテナ特性に切り替えるアンテナ特
性制御手段とを備えたことを特徴とする無線通信システ
ム。1. A wireless communication system including first and second wireless stations for mutually transmitting and receiving wireless signals, wherein the first wireless station includes an antenna device capable of transmitting and receiving by switching a plurality of antenna characteristics. The second radio station may further include: a reception-side reception quality measurement unit that measures reception quality of a reception signal; and control for transmitting a signal related to a measurement result of the reception-side reception quality measurement unit to the first radio station. A signal transmitting unit, wherein the first wireless station extracts a signal related to a measurement result of the reception quality measurement unit from a signal received from the second wireless station, and the antenna device A transmission-side reception quality measurement unit that measures the reception quality of a received signal by switching the reception antenna characteristics of the reception device, and specifies an antenna characteristic that provides the best reception quality, Switching to a transmission antenna characteristic corresponding to the antenna characteristic specified by the transmission-side reception quality measurement unit, and then, when the signal extracted by the signal extraction unit indicates a decrease in reception quality at the second wireless station. A wireless communication system comprising: antenna characteristic control means for switching to the original transmission antenna characteristic or another transmission antenna characteristic.
ンテナ特性に切り替えた場合の前記受信品質をほぼ一定
の時間間隔で測定し、連続する特定の回数の測定におい
て最良の受信品質が得られた回数がもっとも多い受信ア
ンテナ特性を前記もっとも良好な受信品質が得られるア
ンテナ特性とすることを特徴とする請求項１記載の無線
通信システム。2. The transmission-side reception quality measurement unit measures the reception quality at substantially constant time intervals when switching to each reception antenna characteristic, and obtains the best reception quality in a specific number of consecutive measurements. 2. The wireless communication system according to claim 1, wherein the reception antenna characteristic with the largest number of times is set as the antenna characteristic from which the best reception quality is obtained.
ンテナ特性に切り替えた場合の前記受信品質をほぼ一定
の時間間隔で測定し、所定回数の測定において連続して
最良の受信品質が得られた受信アンテナ特性を前記もっ
とも良好な受信品質が得られるアンテナ特性とすること
を特徴とする請求項１記載の無線通信システム。3. The transmission-side reception quality measurement unit measures the reception quality at substantially constant time intervals when switching to each reception antenna characteristic, and continuously obtains the best reception quality in a predetermined number of measurements. 2. The wireless communication system according to claim 1, wherein the determined reception antenna characteristic is an antenna characteristic that provides the best reception quality.
第２の無線局を含み、前記第１の無線局は複数のアンテ
ナ特性を切り替えて送受信可能なアンテナ装置を備えた
無線通信システムであって、 前記第２の無線局は、 受信信号の受信品質を測定する受信側受信品質測定部
と、 前記受信側受信品質測定部の測定結果に係わる信号を前
記第１の無線局に送信する制御信号送信手段とを備え、 前記第１の無線局は、 前記第２の無線局から受信した信号より前記受信側受信
品質測定部の測定結果に係わる信号を抽出する信号抽出
手段と、 前記アンテナ装置の送信アンテナ特性を定期的に切り替
え、送信アンテナ特性を切り替えた後、前記信号抽出手
段が抽出した前記信号により前記第２の無線局における
受信品質の低下が判明した場合にはもとの送信アンテナ
特性または他の送信アンテナ特性に切り替えるアンテナ
特性制御手段とを備えたことを特徴とする無線通信シス
テム。4. A wireless communication system including first and second wireless stations for mutually transmitting and receiving wireless signals, wherein the first wireless station includes an antenna device capable of transmitting and receiving by switching a plurality of antenna characteristics. The second radio station may further include: a reception-side reception quality measurement unit that measures reception quality of a reception signal; and control for transmitting a signal related to a measurement result of the reception-side reception quality measurement unit to the first radio station. A signal transmitting unit, wherein the first wireless station extracts a signal related to a measurement result of the reception quality measurement unit from a signal received from the second wireless station, and the antenna device After periodically switching the transmission antenna characteristics and switching the transmission antenna characteristics, if the reception quality of the second wireless station is found to be reduced by the signal extracted by the signal extraction unit, the original An antenna characteristic control means for switching to transmission antenna characteristics or other transmission antenna characteristics.
質を測定する第２の送信側受信品質測定部と、前記第２
の送信側受信品質測定部の測定結果にもとづいて送信電
力を制御する送信電力制御手段とを備えていることを特
徴とする請求項１または４に記載の無線通信システム。5. The first wireless station includes: a second transmission-side reception quality measurement unit that measures reception quality of a reception signal;
5. The wireless communication system according to claim 1, further comprising: transmission power control means for controlling transmission power based on a measurement result of the transmission-side reception quality measurement unit.
質測定部の測定結果にもとづいて送信電力を制御する第
２の送信電力制御手段を備えていることを特徴とする請
求項１または４に記載の無線通信システム。6. The wireless communication system according to claim 1, wherein the second wireless station includes second transmission power control means for controlling transmission power based on a measurement result of the reception-side reception quality measurement unit. Or the wireless communication system according to 4.
であることを特徴とする請求項１または４に記載の無線
通信システム。7. The wireless communication system according to claim 1, wherein the antenna characteristic is a directional characteristic of the antenna.
信用アンテナとを独立に備えていることを特徴とする請
求項１または４に記載の無線通信システム。8. The wireless communication system according to claim 1, wherein the antenna device includes a receiving antenna and a transmitting antenna independently.
信用および送信用のアンテナとして共用することを特徴
とする請求項１または４に記載の無線通信システム。9. The wireless communication system according to claim 1, wherein the antenna device shares the same antenna as a receiving antenna and a transmitting antenna.
記第２の無線局は移動局であることを特徴とする請求項
１または４に記載の無線通信システム。10. The wireless communication system according to claim 1, wherein the first wireless station is a base station, and the second wireless station is a mobile station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10350243A JP2000174678A (en) | 1998-12-09 | 1998-12-09 | Radio communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10350243A JP2000174678A (en) | 1998-12-09 | 1998-12-09 | Radio communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000174678A true JP2000174678A (en) | 2000-06-23 |
Family
ID=18409196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10350243A Pending JP2000174678A (en) | 1998-12-09 | 1998-12-09 | Radio communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000174678A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001007754A (en) * | 1999-06-22 | 2001-01-12 | Toshiba Corp | Radio communication system and radio base station |
| WO2002007342A1 (en) * | 2000-07-14 | 2002-01-24 | Sanyo Electric Co., Ltd. | Mobile communication terminal, communication method, and program |
| WO2004082173A1 (en) * | 2003-03-12 | 2004-09-23 | Nec Corporation | Transmission beam control method, adaptive antenna transmitter/receiver apparatus and radio base station |
| US7071874B2 (en) | 2002-03-20 | 2006-07-04 | Sanyo Electric Co., Ltd. | Radio terminal device, transmission directivity control method, and transmission directivity control program |
-
1998
- 1998-12-09 JP JP10350243A patent/JP2000174678A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001007754A (en) * | 1999-06-22 | 2001-01-12 | Toshiba Corp | Radio communication system and radio base station |
| WO2002007342A1 (en) * | 2000-07-14 | 2002-01-24 | Sanyo Electric Co., Ltd. | Mobile communication terminal, communication method, and program |
| US7107085B2 (en) | 2000-07-14 | 2006-09-12 | Sanyo Electric Co., Ltd | Mobile communication terminal, communication method and program |
| US7071874B2 (en) | 2002-03-20 | 2006-07-04 | Sanyo Electric Co., Ltd. | Radio terminal device, transmission directivity control method, and transmission directivity control program |
| WO2004082173A1 (en) * | 2003-03-12 | 2004-09-23 | Nec Corporation | Transmission beam control method, adaptive antenna transmitter/receiver apparatus and radio base station |
| US7324784B2 (en) | 2003-03-12 | 2008-01-29 | Nec Corporation | Transmission beam control method, adaptive antenna transmitter/receiver apparatus and radio base station |
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