JP2004328666A

JP2004328666A - Wireless relaying apparatus

Info

Publication number: JP2004328666A
Application number: JP2003124240A
Authority: JP
Inventors: Masanori Kurita; 昌典栗田; Takayuki Arai; 隆之新居; Kazuhiro Matsumoto; 一弘松本; Masayuki Matsuo; 昌行松尾
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2003-04-28
Filing date: 2003-04-28
Publication date: 2004-11-18
Anticipated expiration: 2023-04-28
Also published as: WO2004098207A3; JP4529375B2; CN1792045A; WO2004098207A2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless relaying apparatus capable of reducing the suppression of reception sensitivity on other wireless unit section due to unwanted radiation generated by one wireless unit and increasing the number of accommodatable lines per wireless relaying apparatus or the communication speed. <P>SOLUTION: An antenna 5A for a base station whose polarization plane is directed in a vertical direction and an antenna 5B for a terminal whose polarization plane is directed in a horizontal direction are fitted to both sides of an apparatus main body of the wireless relaying apparatus 1. Thus, the isolation between both the antennas 5A, 5B is increased to reduce the suppression of reception sensitivity of the wireless relaying apparatus 1 due to its own disturbing wave. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用される無線中継装置に関するものである。
【０００２】
【従来の技術】
ＴＤＭＡ方式を用いた無線通信システムで電波の中継を行う場合、ＴＤＭＡの無線中継装置１には図１７に示すように２系統の無線機部２Ａ，２Ｂを搭載し、一方の無線機部２Ａで基地局３との通信を行うと同時に、他方の無線機部２Ｂで端末機４との通信を行う必要がある。この場合例えば基地局３から基地局向けアンテナ５Ａを介して無線機部２Ａの受信部（図示せず）で受信復調された復調信号は無線機部２Ｂの送信部（図示せず）に送られ、この送信部で送信信号として無線周波数変換された後、端末機向けアンテナ５Ｂを介して端末機４へ送られる。
【０００３】
逆に端末機４から端末機向けアンテナ５Ｂを介して無線機部２Ｂの受信部（図示せず）で受信復調された復調信号は、無線機部２Ａの送信部（図示せず）に送られ、この送信部で送信信号として無線周波数変換された後、基地局向けアンテナ５Ａを介して基地局３に送られるようになっている。
【０００４】
ところでＰＨＳの場合、図１８に示すように上りと下りに夫々４つのタイムスロット（以下スロットと略す）を用いて通信を行うようになっており、例えば無線機部４Ａと無線機部４ＢとでスロットＡｔ１とスロットＢｒ１を同時に使用すると、送信スロットＡｔ１での不要輻射によって受信スロットＢｒ１の受信感度抑圧が発生する。
【０００５】
そのため無線中継装置１では、従来、一方の無線機部が発する不要輻射による他方の無線機部への受信感度抑圧を防ぐ目的で、一方の無線機部が送信しているタイミングでは、他方の無線機部では受信しないようにしていた。
【０００６】
また、送信アンテナから受信アンテナに送出出力の一部が廻り込んで異常発振を起こすのを周波数オフセットにより抑圧する機能を備えた無線中継装置も提供されている（例えば特許文献１）。
【０００７】
【特許文献１】
特開平１１−１１２４０２号公報
【０００８】
【発明が解決しようとする課題】
一方の無線機部が発する不要輻射による他方の無線機部への受信感度抑圧を防ぐ目的で、一方の無線機部が送信しているタイミングでは、他方の無線機部では受信しないようにしていた従来の無線中継装置では、一方の無線機が送信しているタイミングでは、他方の無線機は待機状態または送信状態にする必要があるが、２系統の無線機を交互に待機状態と通信状態にさせる場合、一つの無線中継装置当たりの収容可能回線数または通信速度が半分になっていた。
【０００９】
また、無線中継装置内に搭載される２系統の無線機の一方が送信するときは他方も送信、一方が受信するときは他方も受信とする従来例では、基地局と端末機間では無線中継装置を介して通信する場合と、無線中継装置を介さずに通信する場合で、送受信のタイミングが反転していた。
【００１０】
更に、上記特許文献１の場合には、ＩＦ信号を抽出し、位相、振幅、遅延時間を制御して合成器で廻り込み成分を億さえるＩＦ操作系と、結合器１４で抽出しＲＦ信号を同様に制御して合成器で抑えるＲＦ操作系を設ける等構成が複雑であった。
【００１１】
本発明は、上述の点に鑑みて為されたもので、その目的とするところは一方の無線機が発する不要輻射による他方の無線機部への受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能な無線中継装置を提供することにある。
【００１２】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナの偏波面の方向と前記端末機向けアンテナの偏波面の方向とを異ならせて設置したアンテナ装置を具備していることを特徴とする。
【００１３】
請求項２の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナ及び前記端末機向けアンテナを互いにヌル方向となる方向に向けて設置したアンテナ装置を具備していることを特徴とする。
【００１４】
請求項３の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナとして無指向性アンテナを、前記端末機向けアンテナとして指向性アンテナを夫々用いたアンテナ装置を具備していることを特徴とする。
【００１５】
請求項４の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナ及び前記端末機向けアンテナとして夫々に指向性アンテナを用いるとともに夫々の指向方向を異ならせて設置したアンテナ装置を具備していることを特徴とする。
【００１６】
請求項５の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記アンテナ装置が、基地局向けアンテナと前記端末機向けアンテナの何れか一方または両方を装置本体から導出した同軸ケーブルに接続して両アンテナを離間させて設けていることを特徴とする。
【００１７】
請求項６の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナ及び前記端末機向けアンテナに対応したアンテナ給電路に、対応するアンテナを取り外し自在に接続する接続手段を設け、前記基地局向けアンテナの偏波面の方向と前記端末機向けアンテナの偏波面の方向とを異ならせて設置した第１のアンテナ装置、前記基地局向けアンテナ及び前記端末機向けアンテナを互いにヌル方向となる方向に向けて設置した第２のアンテナ装置、前記基地局向けアンテナとして無指向性アンテナを、前記端末機向けアンテナとして指向性アンテナを夫々用いた第３のアンテナ装置、前記基地局向けアンテナ及び前記端末機向けアンテナとして夫々に指向性アンテナを用いるとともに夫々の指向方向を異ならせて設置した第４のアンテナ装置の何れか一つ、若しくはこれら第１乃至第４のアンテナ装置の何れかの一つの内で基地局向けアンテナと前記端末機向けアンテナの何れか一方または両方を装置本体から導出した同軸ケーブルに接続して装置本体から離した位置に設けているアンテナ装置の各アンテナを上記接続手段に選択接続することを特徴とする。
【００１８】
請求項７の発明では、請求項６の発明において、設置環境での通信エラー率と受信電界強度を基に最適なアンテナ装置を選択するアンテナ選択手段と、アンテナ選択手段で選択されたアンテナ装置を通知する手段とを備えていることを特徴とする。
【００１９】
請求項８の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記端末機向けアンテナが接続されるアンテナ給電路にアッテネータを挿入して成ることを特徴とする。
【００２０】
請求項９の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナを介して基地局からの送信電波を受信する受信部での受信エラーを検出する受信エラー検出手段と、該受信エラー検出手段が検出する受信エラー状況を基に、端末機向けアンテナを介して電波を送信する送信部の送信電力を調整する制御手段とを備えていることを特徴とする。
【００２１】
請求項１０の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、スロット使用率監視を行い、基地局向けと端末機向けで、送受信タイミングが重ならないように使用スロットを選択するスロット制御手段を備えていることを特徴とする。
【００２２】
請求項１１の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、前記基地局向けアンテナの偏波面の方向と前記端末機向けアンテナの偏波面の方向とを異ならせて設置した第１のアンテナ装置、前記基地局向けアンテナ及び前記端末機向けアンテナを互いにヌル方向となる方向に向けて設置した第２のアンテナ装置、前記基地局向けアンテナとして無指向性アンテナを、前記端末機向けアンテナとして指向性アンテナを夫々用いた第３のアンテナ装置、前記基地局向けアンテナ及び前記端末機向けアンテナとして夫々に指向性アンテナを用いるとともに夫々の指向方向を異ならせて設置した第４のアンテナ装置の何れか一つからなる一のアンテナ装置と、基地局向けアンテナ及び端末機向けアンテナが共に無指向性アンテナからなる他のアンテナ装置と、スロット使用率の監視を行いスロット使用率が５０％以下のときに他のアンテナ装置を、スロットの使用率が５０％を越える場合に一のアンテナ装置を切り替えるアンテナ選択手段とを備えていることを特徴とする。
【００２３】
請求項１２の発明では、送信チャネル及び受信チャネルで使用する周波数帯が近接する、ＴＤＭＡ方式を用いる無線通信システムにあって、弱電界地域を通信エリアとして補うために使用され、基地局若しくは端末機から送信された電波を基地局向けアンテナ若しくは端末機向けアンテナで受信した後に、受信信号を端末機若しくは基地局に向けて、端末機向けアンテナ若しくは基地局向けアンテナから送信する無線中継装置において、設置する際に二つのアンテナを用いて周辺の複数基地局から到来する電波の受信レベルを夫々のアンテナ毎に測定する測定手段と、該測定手段の測定結果からより多くの基地局を高レベルで受信できた方のアンテナを前記基地局向けアンテナとし、残りのアンテナを前記端末機向けアンテナとして設定する手段を備えていることを特徴とする。
【００２４】
【発明の実施の形態】
以下本発明を実施形態により説明する。
【００２５】
（実施形態１）
図１は本実施形態の無線中継装置１の外観を示しており、装置本体１０内には図１７に示す無線中継装置１と同様に２系統の無線機部（図示せず）を収納し、装置本体４の両側側面には基地局向けの無線機部のアンテナ給電路に接続されるモノポール型の基地局向けアンテナ５Ａ、端末機向けの無線基部のアンテナ給電路に接続されるモノポール型の端末機向けアンテナ５Ｂを夫々取り付けて無線中継装置１のアンテナ装置としている点に特徴がある。
【００２６】
そして図示例では基地局向けアンテナ５Ａの偏波面を垂直方向に向け、端末機向けアンテナ５Ｂの偏波面を水平方向に向けてある。
【００２７】
而して本実施形態では、基地局向けアンテナ５Ａを垂直偏波、端末機向けアンテナ５Ｂを水平偏波とすることで、両アンテナ５Ａ，５Ｂ間のアイソレーションを高め、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置１当たりの収容可能回線数または通信速度を高めることを可能としている。
【００２８】
尚基地局向けアンテナ５Ａの偏波面を垂直偏波とした理由は、通常基地局では垂直偏波アンテナが使用され、また無線中継装置１からみて基地局からの電波が端末機からの電波に比べて弱いため、基地局からの電波を受信しやすいようにするためである。
【００２９】
また、本実施形態においては、両アンテナ５Ａ，５Ｂとして直線偏波のアンテナを用いているが、円偏波アンテナを用いてその偏波を変えても同様にアイソレーションを高め、自己妨害波による受信感度抑圧を軽減できる。
【００３０】
（実施形態２）
実施形態１では基地局向けアンテナ５Ａの偏波面と、端末局向けアンテナ５の偏波面とを異ならしたアンテナ装置を用いたが、本実施形態は、図２に示すように装置本体１０の上面の両側に互いにヌル方向に向けて水平配置したモノポール型の基地局向けアンテナ５Ａと端末機向けアンテナ５Ｂとを配置したアンテナ装置を用いている点に特徴がある。
【００３１】
而して本実施形態では、基地局向けアンテナ５Ａと端末機向けアンテナ５Ｂを互いにヌル方を向けることで、アンテナ５Ａ，５Ｂ間のアイソレーションを高め、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることを可能としている。
【００３２】
尚装置本体１０内には図１７で示す場合と同様に基地局向けの無線機部と、端末機向けの無線機部とを収納している。
【００３３】
（実施形態３）
本実施形態は、図３に示すように無線中継装置１の装置本体１０の一方の側面に垂直方向に設けた無指向性のダイポール型の基地局向けアンテナ５Ａと、装置本体１０の他方の側面に設けたパッチアンテナからなる指向性を有する端末機向けアンテナ５Ｂとからなるアンテナ装置を用いている点に特徴がある。
【００３４】
而して本実施形態では、基地局向けアンテナ５Ａを無指向性アンテナ、端末機向けアンテナ５Ｂを指向性アンテナとすることで、両アンテナ５Ａ、５Ｂに無指向性アンテナを用いた無線中継装置と同等の中継可能エリアを保ったまま、アンテナ５Ａ，５Ｂ間のアイソレーションを高め、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることを可能としている。
【００３５】
尚装置本体１０内には図１７で示す場合と同様に基地局向けの無線機部と、端末機向けの無線機部とを収納している。
【００３６】
（実施形態４）
本実施形態は、図４に示すように無線中継装置１の装置本体１０の両側面に夫々設けられた指向性を有するパッチアンテナからなる基地局向けアンテナ５Ａ、端末機向けアンテナ５Ｂにより構成されるアンテナ装置を用いている点に特徴がある。
【００３７】
而して本実施形態では、基地局向けアンテナ５Ａ及び端末機向けアンテナ５Ｂを共に指向性アンテナとすることで、アンテナ５Ａ，５Ｂ間のアイソレーションを高め、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることを可能としている。
【００３８】
（実施形態５）
上記実施形態１乃至４は両アンテナ５Ａ、５Ｂを装置本体１０に取り付ける構造であったが、本実施形態は図５に示すように装置本体１０内に設けてある基地局向け無線機部（図示せず）のアンテナ給電路として同軸ケーブル６Ａを装置本体１０の一側面から導出して、その同軸ケーブル６Ａの端部に基地局向けアンテナ５Ａを接続し、同様に装置本体１０内に設けてある端末機向け無線機部（図示せず）のアンテナ給電路として同軸ケーブル６Ｂを装置本体１０の他の側面から導出して、その同軸ケーブル６Ｂの端部に端末機向けアンテナ５Ｂを接続することにより、両アンテナ５Ａ、５Ｂを離間させて設置するアンテナ装置を用いた点に特徴がある。尚本実施形態では両アンテナ５Ａ、５Ｂとして実施形態４と同様に指向性を有するパッチアンテナを用いている。
【００３９】
而して本実施形態では、両アンテナ５Ａ．５Ｂを互いに離して設置することで、アンテナ５Ａ，５Ｂ間のアイソレーションをより高め、自己妨害波による受信感度抑圧を軽減し。一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となる。
【００４０】
尚使用するアンテナ装置は、実施形態１〜３の何れのアンテナ装置であっても勿論良い。
【００４１】
（実施形態６）
上記実施形態１〜５では使用されるアンテナ装置の形態は予め決めたものであったが、本実施形態では図６に示すように無線中継装置１の装置本体１０の両側面の一方に装置本体１０内の基地局向け無線機部（図示せず）のアンテナ給電路にアンテナを接続する接続コネクタ７Ａを、他方に装置本体１０内の端末機向け無線機部（図示せず）のアンテナ給電路にアンテナを接続する接続コネクタ７Ｂを設け、一方アンテナ５Ａ、５Ｂ側に被接続コネクタ８Ａ、８Ｂを設けることでアンテナ５Ａ，５Ｂを取り外し自在とし、これにより使用するアンテナ装置を選択して接続ができるようになっている。
【００４２】
而して本実施形態では、例えば設置環境により実施形態１のアンテナ装置で所望のアイソレーションが縛られない場合は、実施形態５のアンテナ装置に付け替えることで、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることを可能としている。勿論実施形態２〜４のアンテナ装置を設置環境次第で用いても良い。
【００４３】
（実施形態７）
実施形態６では使用するアンテナ装置を設置環境に応じて選択できるようにしたものであるが、本実施形態は選択して使用するアンテナ装置の最適なものを自動的に通知するアンテナ選択手段を持たせたものである。
【００４４】
つまり、図７に示すように無線中継装置１の装置本体１０に、基地局向けアンテナ２に接続された無線機部２Ａの受信レベルを測定する受信レベル測定部１１と、受信エラーをカウントする受信エラーカウント部１２と、最適アンテナ判断部１３と、ブザー１４とで構成されるアンテナ選択手段を設けてある。
【００４５】
而して受信レベル測定部１１で測定した受信レベルと、受信エラーカウント部１２で測定したＦＥＲ（ＦｒａｍｅＥｒｒｏｒＲａｔｉｏ）を基に最適アンテナ判断部１３でその設置環境での最適なアンテナ装置を判断し、その判断内容に基づいてブザー１４を駆動制御して判断内容に応じた報知音で通知する。
【００４６】
図８は最適アンテナ判断部１３の判断フローを示しており、まず判断を開始すると、受信レベル測定部１１で測定した受信レベルが例えば３０ｄＢμＶ未満であるか否かのチェックを行い（Ｓ１）、受信レベルが３０ｄＢμＶ未満で有れば、エラー率が１０％未満か否かをチェックし（Ｓ２）、１０％未満であれば現在使用しているアンテナ装置の変更不要をブザー１４の報知音で通知する（Ｓ３）。
【００４７】
そしてＳ２のチェックでエラー率が１０％以上の場合には、アイソレーションが１段良好となるアンテナ装置への交換をブザー１４の報知音で知らせる（Ｓ４）。
【００４８】
また受信レベルが３０ｄＢμＶ以上の場合には、受信レベルが４０ｄＢμＶ未満なのか否かのチェックを行う（Ｓ５）。ここでは受信レベルが４０ｄＢμＶ未完である場合、エラー率が１％未満か否かのチェックを行い（Ｓ６）、１％未満であれば、現在使用しているアンテナ装置の変更不要をブザー１４の報知音で通知する（Ｓ７）。Ｓ６のチェックでエラー率が１％以上の場合には、更にエラー率が１０％未満か否かのチェックを行い（Ｓ８）、エラー率が１０％未満であれば、アイソレーションが１段良好となるアンテナ装置への交換をブザー１４の報知音で知らせる（Ｓ９）。またエラー率が１０％以上有る場合にはアイソレーションが２段良好となるアンテナ装置への交換をブザー１４の報知音で知らせる（Ｓ１０）。
【００４９】
上記Ｓ５のチェックで受信レベルが４０ｄＢμＶ以上あれば、エラー率が１０％未満か否かのチェックを行い（Ｓ１１）、１０％未満であればアイソレーションが２段良好となるアンテナ装置への交換をブザー１４の報知音で知らせる（Ｓ１２）。そしてＳ１１のチェックでエラー率が１０％以上の場合には、更にエラー率が１０％未満か否かのチェックを行い（Ｓ１３）、エラー率が１０％未満であれば、アイソレーションが２段良好となるアンテナ装置への交換をブザー１４の報知音で知らせる（Ｓ１４）。またエラー率が１０％以上有る場合にはアイソレーションが３段良好となるアンテナ装置への交換をブザー１４の報知音で知らせる（Ｓ１５）。
【００５０】
このようにして現在接続しているアンテナ装置の交換の要否の通知と、交換の場合には現在接続しているアンテナ装置に対してアイソレーションの良好なアンテナ装置を段階通知とを、異なるブザー１４の報知音で通知することで、設置環境に最適なアンテナ装置の選択接続をユーザー若しくは施工者を促すのである。
【００５１】
而して本実施形態では、設置環境に最適なアンテナ装置を使用することができ、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となる。
【００５２】
（実施形態８）
上記実施形態７はブザー１４の報知音で最適なアンテナ装置を通知するものあったが、本実施形態は図９に示すようにブザー１４による報知音の代わり、絵や文字の表示で通知する液晶表示器等からなる表示装置１５を設けたものである。つまり最適アンテナ判断部１３はその判断内容に基づいて表示装置１５の表示を制御して判断内容に応じた絵或いは文字を表示させることで通知する。尚表示装置１５には絵や文字等を生成する回路が備わっているものを用いる。
【００５３】
尚その他の構成及び最適アンテナ判断部１３の判断フローは実施形態７と同じであるのでここでは説明は省略する。
【００５４】
而して本実施形態では、最適アンテナを使用することができ、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となる。
【００５５】
（実施形態９）
上記各実施形態１乃至８では、基地局向けアンテナ５Ａと、端末機向けアンテナ５Ｂとの組み合わせを自己妨害波による受信感度抑圧を低減できるもの同士としたアンテナ装置を用いるようにしているが、本実施形態は、図１０に示すように基地局向けアンテナ５Ａ，端末機向けアンテナ５Ｂとして共に従来と同様に垂直偏波のモノポール型のアンテナを用いたアンテナ装置を使用しているが、端末機向けアンテナ５Ｂのアンテナ給電路にはアッテネータ１６を挿入してある。
【００５６】
而して本実施形態では、端末機向けアンテナ５Ｂにアッテネータ１６を挿入することで、基地局向けアンテナ５Ａからの妨害波の影響を軽減し、かつ端末機向けアンテナ５Ｂから発する妨害波も軽減することができる。
【００５７】
これにより、端末機向けアンテナ５Ｂ、基地局向けアンテナ５Ａ双方の妨害波の受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となる。
【００５８】
尚尚装置本体１０内には図１７で示す場合と同様に基地局向けの無線機部と、端末機向けの無線機部とを収納している。
【００５９】
（実施形態１０）
上記各実施形態１乃至８では、基地局向けアンテナ５Ａと、端末機向けアンテナ５Ｂとの組み合わせを自己妨害波による受信感度抑圧を低減できるもの同士としたアンテナ装置を用い、実施形態９では端末機向けアンテナ５Ｂのアンテナ給電路にアッテネータ１６を挿入することで、自己妨害波による受信感度抑圧を軽減するようにしているが、本実施形態は、図１１に示すように基地局向けアンテナ５Ａ，端末機向けアンテナ５Ｂとして共に従来と同様に垂直偏波のモノポール型のアンテナを用いたアンテナ装置を使用しているが、端末機向け側の無線機部Ｂにおいて、送信用のアンプとして可変利得アンプ１７を用い、この可変利得アンプ１７のゲインを基地局向けの無線機部２Ａ側での通信エラーが増加した場合に小さくし、送信電力を下げることで受信感度を落とすことなく端末機向けアンテナ５Ｂから発射される妨害波を低減するようにした点に特徴がある。
【００６０】
ここで基地局向けの無線機部２Ａの受信部２０に対応して、受信復調された復調信号から上述のＦＥＲをカウントする受信エラーカウント部１２と、受信レベル測定部１１と、受信エラーカウント部１２でカウントされたエラーが予め設定している閾値より増加したときに受信波の受信レベルが十分高いにも関わらずＦＥＲが多い場合は上記可変利得アンプ１７のゲインを下げる方向に制御するゲイン制御部１９とを設けている。
【００６１】
一方端末機向けの無線機部２Ｂの送信部２１には、無線機部２Ａの受信部２０で受信復調された復調信号を取り込んで送信信号として発生させる送信信号発生部２２と、送信信号発生部２１からの送信信号を無線周波数に変換する周波数変換器２３と、上記の可変利得アンプ１７とを備え、可変利得アンプ１７の送信出力を送受切り替えスイッチ２４を介して端末機向けアンテナ５Ｂへ給電されるようになっている。尚端末機向けアンテナ５Ｂは受信時には送受信切り替えスイッチ２３の切り替え動作により受信部２４に接続され、基地局からの電波信号を受信部２５で受信復調するようになっている。また無線機部２Ａにも受信部２０と送信部１８と送受信切り替えスイッチ（図示せず）とを備えているが、送信部１８の送信出力の増幅用アンプには利得が固定されているアンプが用いられている。
【００６２】
而して、設置場所の周りの人の動きや、家具の移動などによって基地局向け無線機部２Ａでの通信エラー数が閾値より増加した場合、受信レベル測定部１１の測定レベルが所定レベルに低下するように、ゲイン制御部１７は可変利得アンプ１４のゲインを小さくなるように制御し、端末機向けの無線機部２Ｂの送信電力を下げる。これにより無線機部２Ａの受信感度を落とすことなく端末機向けアンテナ５Ｂから発射される自己妨害波を低減することができる。
【００６３】
また、基地局向け無線機部２Ａでの通信エラー数が閾値より減少した場合、ゲイン制御部１７で可変利得アンプ１７のゲインを、受信レベル測定部１１の測定レベルが所定のレベルとなるように大きく制御し、送信電力を上げることで、通信エリアを広げることができる。
【００６４】
これにより、本実施形態では、基地局向けアンテナ５Ａの自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収容。可能回線数または通信速度を高めることが可能となる。
【００６５】
（実施形態１１）
本実施形態は、図１２に示すように基地局向けの無線機部２Ａの受信部２０での受信信号から基地局によって割り当てられたスロットを検出してその使用スロットを端末局向けの無線機部２Ｂへ通知する使用スロット通知部２６と、該スロット通知部１８からの通知に基づいて、端末機向けの無線機部２Ｂの送信部２１での使用スロットを決定する決定するスロット制御部２７とを設けた点に特徴があり、基地局向けアンテナ５Ａ，端末機向けアンテナ５Ｂとして共に従来と同様に垂直偏波のモノポール型のアンテナを用いたアンテナ装置を使用している。
【００６６】
而して本実施形態では、図１３に示すように基地局によって割り当てられたスロット通知部２６から割り当てのスロットが通知されると、スロット制御部２７は、基地局との通信での使用スロット数が３以上若しくは３未満かをチェックする（Ｓ１）。ここでＰＨＳで使用されるスロットは図１８で説明したように全スロット数が４スロットである。そしてその使用スロット使用が３未満、つまり使用率が５０％以下の場合、スロット制御部２７は使用スロット通知部２６に対して対基地局使用スロットを問い合わせを行い（Ｓ２）、その問い合わせ結果から対基地局未使用スロットを任意に対端末機用に割り当てる（Ｓ３）。そしてスロットを端末機に使用する否かの判定（Ｓ４）後、使用しなければ割り当てを完了し、使用する場合には上記未使用スロットを対端末機に使用するスロットとして切り替える（Ｓ５）。一方基地局との通信でスロット使用数が３以上、つまり使用率が５０％を超える場合、対端末機との通信に使用するスロットとして空きスロットを任意に選択し（Ｓ６）、送信部２１に対するスロット割り当てを完了する。
【００６７】
これにより、基地局との通信でのスロット使用率が５０％以下であれば端末機側での送信による受信感度抑圧が発生しなくなり、通信速度を高めることが可能となる。
【００６８】
（実施形態１２）
実施形態１１では対端末機で使用するスロットを、基地局との通信でのスロット使用率で割り当て制御するようにしているが、本実施形態は実施形態１１の構成に加えて、図１４に示すようにスロット使用率が５０％以下の場合は、アンテナ装置としては無指向性のアンテナ５Ａ、５Ｂを使用するように切り替えスイッチ２８Ａ，２８Ｂを駆動して切り替え、スロット使用率が５０％を超える場合には、同軸ケーブル付きのアンテナ５Ａ、５Ｂからなるスイッチ装置を使用するように切り替えスイッチ２８Ａ，２８Ｂを駆動する構成を加えた点に特徴がある。ここで同軸ケーブル６Ａ，６Ｂ付きのアンテナ５Ａ，５Ｂとしては指向性のパッチアンテナを用いる。勿論実施形態１乃至４のアンテナ装置を用いても良い。
【００６９】
而して本実施形態では、スロット使用率が５０％以下であれば、従来の無指向性のアンテナ５Ａ，５Ｂを用いた無線中継装置と同様の中継可能エリアを保つことができ、スロット使用率が５０％を越える場合であれば、自己妨害波の受信感度抑圧を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となる。
【００７０】
（実施形態１３）
本実施形態は図１５に示すように、２つの無線機部２，２に夫々受信レベル測定部１１、１１を付設し、これらの受信レベル測定部１１、１１で、各無線機部２，２のアンテナ５，５での受信レベルを基地局ＩＤとともに基地局方向判定部２９に通知し、基地局方向判定部２９で通知結果を基に基地局方向を決定する。つまり一方のアンテナ５を基地局向けアンテナ、他方のアンテナ５を端末機向けアンテナとし、夫々の無線機部２，２を基地局向け、端末機向けとする。
【００７１】
つまり図１６に示すように本実施形態の無線中継装置１を設置後に電源投入を行った初期の所定期間では、周辺基地局からの電波を両無線機部２、２で受信して、受信レベル測定部１１、１１で測定した受信レベルと、受信した基地局ＩＤとを基地局方向判定部２１に通知する周辺基地局サーチを開始し（Ｓ１）、この周辺基地局サーチを一定時間継続的に実行する。
【００７２】
これにより基地局方向判定部２１では双方のアンテナ５、５に対応した通知結果から、待ち受け可能レベル（例えば３５ｄＢμＶ以上）以上の基地局数を夫々無線機部毎にカウントし（Ｓ２、Ｓ３）、その後両無線機部の待ち受け可能な基地局数Ａ，Ｂを比較し（Ｓ４）、その基地局数が多い方のアンテナ５を基地局向けアンテナとし、少ない方のアンテナを端末機向けアンテナとして設定し、周辺基地局サーチを終了する（Ｓ５）。
【００７３】
而して本実施形態では、一般的に不要輻射の影響を受けやすい基地局向けアンテナでの受信レベルを高く保つことができ、受信感度抑圧の影響を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となる。
【００７４】
【発明の効果】
請求項１の発明乃至請求項６の何れの発明も、基地局向けアンテナと端末機向けアンテナのアイソレーションを高め、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収納可能回線数または通信速度を高めることができるという効果がある。
【００７５】
特に請求項７の発明は、上述の効果を得ることができる最適なアンテナ装置を知ることができるという効果がある。
【００７６】
請求項８の発明は、基地局向けアンテナへの不要輻射を低減し、基地局向けアンテナからの不要輻射の影響も少なくでき、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収納可能回線数または通信速度を高めることができるという効果がある。
【００７７】
請求項９の発明は、基地局向けアンテナへの自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収納可能回線数または通信速度を高めることができるという効果がある。
【００７８】
請求項１０の発明は、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収納可能回線数または通信速度を高めることができるという効果がある。
【００７９】
請求項１１の発明は、設置環境に応じたアンテナ装置に切り替えることで、アイソレーションを高め、自己妨害波による受信感度抑圧を軽減し、一つの無線中継装置当たりの収納可能回線数または通信速度を高めることができるという効果がある。
【００８０】
請求項１２の発明は、一般的に不要輻射の影響を基地局向けアンテナでの受信レベルを高く保つことができ、そのため受信感度抑圧の影響を軽減し、一つの無線中継装置当たりの収容可能回線数または通信速度を高めることが可能となるという効果がある。
【図面の簡単な説明】
【図１】本発明の実施形態１の無線中継装置の斜視図である。
【図２】本発明の実施形態２の無線中継装置の斜視図である。
【図３】本発明の実施形態３の無線中継装置の斜視図である。
【図４】本発明の実施形態４の無線中継装置の斜視図である。
【図５】本発明の実施形態５の無線中継装置の斜視図である。
【図６】本発明の実施形態６の無線中継装置のアンテナ装置を外した状態の斜視図である。
【図７】本発明の実施形態７の無線中継装置の回路構成図である。
【図８】同上の動作説明用フローチャートである。
【図９】本発明の実施形態８の無線中継装置の回路構成図である。
【図１０】本発明の実施形態９の無線中継装置の斜視図である。
【図１１】本発明の実施形態１０の無線中継装置の回路構成図である。
【図１２】本発明の実施形態１１の無線中継装置の回路構成図である。
【図１３】同上の動作説明用フローチャートである。
【図１４】本発明の実施形態１２の無線中継装置の回路構成図である。
【図１５】本発明の実施形態１３の無線中継装置の回路構成図である。
【図１６】同上の動作説明用フローチャートである。
【図１７】無線中継装置を用いた通信システム図である。
【図１８】同上の通信システムに用いるタイムスロットのタイミングチャートである。
【符号の説明】
１無線中継装置
５Ａ，５Ｂアンテナ
１０装置本体[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, and to a wireless relay device used to supplement a weak electric field area as a communication area.
[0002]
[Prior art]
When radio waves are relayed in a wireless communication system using the TDMA system, the TDMA wireless relay device 1 is equipped with two systems of wireless units 2A and 2B as shown in FIG. At the same time as performing communication with the base station 3, it is necessary to perform communication with the terminal 4 using the other radio unit 2B. In this case, for example, the demodulated signal received and demodulated by the receiving unit (not shown) of the radio unit 2A from the base station 3 via the base station antenna 5A is transmitted to the transmitting unit (not shown) of the radio unit 2B. After the radio frequency conversion is performed as a transmission signal by the transmission unit, the transmission signal is transmitted to the terminal 4 via the terminal antenna 5B.
[0003]
Conversely, the demodulated signal received and demodulated by the receiving unit (not shown) of the radio unit 2B from the terminal 4 via the terminal antenna 5B is sent to the transmitting unit (not shown) of the radio unit 2A. After being radio-frequency converted as a transmission signal by the transmission unit, the transmission signal is transmitted to the base station 3 via the base station antenna 5A.
[0004]
By the way, in the case of the PHS, as shown in FIG. 18, communication is performed using four time slots (hereinafter abbreviated as slots) respectively for uplink and downlink. For example, the radio unit 4A and the radio unit 4B communicate with each other. When the slot At1 and the slot Br1 are used at the same time, the reception sensitivity of the reception slot Br1 is suppressed due to unnecessary radiation in the transmission slot At1.
[0005]
For this reason, in the wireless relay device 1, conventionally, in order to prevent the reception sensitivity of the other wireless device from being suppressed by unnecessary radiation emitted by the one wireless device, the other wireless device transmits the other wireless device at the same time. The machine did not receive it.
[0006]
Also, there has been provided a wireless relay apparatus having a function of suppressing, by a frequency offset, a part of a transmission output from a transmitting antenna to a receiving antenna to cause abnormal oscillation (for example, Patent Document 1).
[0007]
[Patent Document 1]
JP-A-11-112402
[0008]
[Problems to be solved by the invention]
In order to prevent the suppression of reception sensitivity to the other radio unit due to unnecessary radiation emitted from one radio unit, the other radio unit did not receive at the timing when one radio unit transmits. In the conventional wireless relay device, when one of the wireless devices is transmitting, the other wireless device needs to be in a standby state or a transmission state, but the two wireless devices alternately enter a standby state and a communication state. In this case, the number of lines that can be accommodated or the communication speed per wireless relay device is reduced by half.
[0009]
Also, in the conventional example, when one of two systems of radio equipment mounted in a wireless relay apparatus transmits, the other transmits, and when one receives, the other also receives. The timing of transmission and reception has been reversed between the case where communication is performed via the device and the case where communication is performed without using the wireless relay device.
[0010]
Further, in the case of Patent Document 1, an IF operation system for extracting an IF signal, controlling the phase, amplitude, and delay time to reduce the sneak component with a combiner, and extracting an RF signal with a combiner 14 are provided. Similarly, the configuration was complicated, such as providing an RF operation system controlled and controlled by a synthesizer.
[0011]
The present invention has been made in view of the above points, and an object of the present invention is to reduce the suppression of reception sensitivity to the other radio unit due to unnecessary radiation emitted from one radio, and to provide one radio relay device. It is an object of the present invention to provide a wireless relay device capable of increasing the number of lines that can be accommodated or the communication speed.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, in order to supplement a weak electric field area as a communication area. Used, after receiving the radio wave transmitted from the base station or the terminal by the base station antenna or the terminal antenna, the received signal is transmitted from the terminal antenna or the base station antenna toward the terminal or the base station. The radio relay device according to claim 1, further comprising an antenna device installed with the direction of the polarization plane of the antenna for the base station different from the direction of the polarization plane of the antenna for the terminal.
[0013]
According to a second aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, wherein the base station or the terminal is used to supplement a weak electric field area as a communication area. After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station, An antenna device is provided, wherein an antenna for a base station and the antenna for a terminal are installed so as to face each other in a null direction.
[0014]
According to a third aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, wherein the base station or the terminal is used to supplement a weak electric field area as a communication area. A radio relay apparatus that receives a radio wave transmitted from the antenna for a base station or an antenna for a terminal, and then transmits a received signal from the antenna for the terminal or the antenna for the base station toward the terminal or the base station. An antenna device using an omnidirectional antenna as a station antenna and a directional antenna as the terminal antenna is provided.
[0015]
According to a fourth aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other. A radio relay apparatus that receives a radio wave transmitted from the antenna for a base station or an antenna for a terminal, and then transmits a received signal from the antenna for the terminal or the antenna for the base station toward the terminal or the base station. A directional antenna is used as each of an antenna for a station and an antenna for the terminal, and an antenna device is provided in which the directional directions are different from each other.
[0016]
According to a fifth aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used for a transmission channel and a reception channel are close to each other, wherein the wireless communication system is used to supplement a weak electric field area as a communication area, and After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station, The antenna device is characterized in that one or both of an antenna for a base station and an antenna for a terminal are connected to a coaxial cable derived from a device main body, and the antennas are separated from each other.
[0017]
According to a sixth aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, wherein the wireless communication system is used to supplement a weak electric field area as a communication area, and After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station, The antenna feed path corresponding to the base station antenna and the terminal antenna is provided with connection means for detachably connecting the corresponding antenna, and the direction of the polarization plane of the base station antenna and the polarization of the terminal antenna are provided. A first antenna device installed with a different wavefront direction, the base station antenna, A second antenna device in which terminal antennas are installed in the null directions, a third antenna using an omnidirectional antenna as the base station antenna, and a third directional antenna using the terminal antenna as the terminal antenna. An antenna device, a directional antenna is used as each of the base station antenna and the terminal device antenna, and any one of the fourth antenna devices installed with different directional directions or the first to the fourth antenna devices is used. 4, one or both of the antenna for the base station and the antenna for the terminal are connected to a coaxial cable derived from the apparatus main body and provided at a position away from the apparatus main body. Each antenna of the antenna device is selectively connected to the connection means.
[0018]
According to a seventh aspect of the present invention, in the sixth aspect of the present invention, there is provided an antenna selecting means for selecting an optimal antenna apparatus based on a communication error rate and a received electric field strength in an installation environment, and an antenna apparatus selected by the antenna selecting means. Notification means.
[0019]
In a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, the invention is used to supplement a weak electric field area as a communication area, and a base station or a terminal. After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station, It is characterized in that an attenuator is inserted into an antenna feed line to which an antenna for a terminal is connected.
[0020]
According to the ninth aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, wherein the wireless communication system is used to supplement a weak electric field area as a communication area, and After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station, A receiving error detecting means for detecting a receiving error in a receiving unit for receiving a transmission radio wave from the base station via an antenna for the base station, and an antenna for the terminal based on a receiving error state detected by the receiving error detecting means. And control means for adjusting the transmission power of the transmission unit for transmitting radio waves via the control unit.
[0021]
According to a tenth aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other. After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal to the terminal or the base station, from the antenna for the terminal or the antenna for the base station, It is characterized by comprising slot control means for monitoring the usage rate and selecting a used slot for the base station and the terminal so that transmission / reception timing does not overlap.
[0022]
According to an eleventh aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, wherein the base station or the terminal is used to supplement a weak electric field area as a communication area. After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station, The first antenna device installed with the direction of the polarization plane of the antenna for the base station and the direction of the polarization plane of the antenna for the terminal different from each other, the antenna for the base station and the antenna for the terminal have null directions with respect to each other. A second antenna device installed in a direction, an omnidirectional antenna as the base station antenna, A third antenna device using a directional antenna as the terminal antenna, a third antenna device using a directional antenna as the base station antenna and the terminal antenna, and installing the antennas with different directional directions. And the other antenna device, in which both the base station antenna and the terminal antenna are omnidirectional antennas, monitors the slot usage rate and monitors the slot usage rate. Antenna switching means for switching between another antenna device when is less than 50% and one antenna device when the slot utilization exceeds 50%.
[0023]
According to a twelfth aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, wherein the wireless communication system is used to supplement a weak electric field area as a communication area, and After receiving the radio wave transmitted from the antenna for the base station or the antenna for the terminal, in the wireless relay device for transmitting the received signal from the antenna for the terminal or the antenna for the base station toward the terminal or the base station, Measurement means for measuring the reception level of radio waves arriving from a plurality of peripheral base stations using two antennas for each antenna, and receiving more base stations at a high level from the measurement results of the measurement means. The resulting antenna is set as the base station antenna, and the remaining antennas are set as the terminal antennas. Characterized in that it comprises a stage.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to embodiments.
[0025]
(Embodiment 1)
FIG. 1 shows an appearance of a wireless relay device 1 of the present embodiment. In a device main body 10, two wireless units (not shown) are housed similarly to the wireless relay device 1 shown in FIG. On both side surfaces of the apparatus body 4, a monopole-type base station antenna 5A connected to an antenna feed line of a radio unit for a base station, and a monopole type antenna connected to an antenna feed line of a radio base for a terminal. This is characterized in that the antennas 5B for the terminal are attached to each other to form the antenna device of the wireless relay device 1.
[0026]
In the illustrated example, the polarization plane of the antenna 5A for the base station is oriented vertically, and the polarization plane of the antenna 5B for the terminal is oriented horizontally.
[0027]
Thus, in this embodiment, the antenna 5A for the base station is vertically polarized and the antenna 5B for the terminal is horizontally polarized, so that the isolation between the antennas 5A and 5B is increased, and the reception sensitivity due to the self-interference wave is increased. The suppression is reduced, and the number of lines that can be accommodated per one wireless relay device 1 or the communication speed can be increased.
[0028]
Note that the reason why the polarization plane of the antenna 5A for the base station is vertically polarized is that a vertical polarization antenna is usually used in the base station, and that the radio wave from the base station is compared with the radio wave from the terminal as viewed from the wireless relay apparatus 1. This is to make it easier to receive radio waves from the base station.
[0029]
Further, in the present embodiment, linearly polarized antennas are used as both antennas 5A and 5B. However, even if the polarization is changed using a circularly polarized antenna, the isolation is similarly increased and the self-interference wave is increased. Suppression of reception sensitivity can be reduced.
[0030]
(Embodiment 2)
In the first embodiment, the antenna device in which the polarization plane of the antenna 5A for the base station and the polarization plane of the antenna 5 for the terminal station are different from each other is used. However, in the present embodiment, as shown in FIG. It is characterized in that an antenna device in which a monopole type antenna 5A for a base station and an antenna 5B for a terminal are arranged horizontally on both sides in the null direction is used.
[0031]
Thus, in the present embodiment, the antenna 5A for the base station and the antenna 5B for the terminal are turned toward each other in the null direction, so that the isolation between the antennas 5A and 5B is increased, and the suppression of the reception sensitivity due to the self-interference wave is reduced. It is possible to increase the number of lines that can be accommodated per one wireless relay device or the communication speed.
[0032]
Note that a radio unit for a base station and a radio unit for a terminal are housed in the apparatus body 10 as in the case shown in FIG.
[0033]
(Embodiment 3)
This embodiment includes an omnidirectional dipole-type base station antenna 5A provided vertically on one side of the device main body 10 of the wireless relay device 1 as shown in FIG. The antenna device is characterized in that it uses an antenna device comprising a terminal antenna 5B having directivity and comprising a patch antenna provided in the first embodiment.
[0034]
Thus, in this embodiment, the antenna 5A for the base station is a non-directional antenna, and the antenna 5B for the terminal is a directional antenna. It is desirable to increase the isolation between the antennas 5A and 5B, reduce the suppression of reception sensitivity due to self-interference, and increase the number of lines or communication speed that can be accommodated in one wireless relay device while maintaining the same relayable area. It is possible.
[0035]
Note that a radio unit for a base station and a radio unit for a terminal are housed in the apparatus body 10 as in the case shown in FIG.
[0036]
(Embodiment 4)
As shown in FIG. 4, the present embodiment is configured by a base station antenna 5A and a terminal antenna 5B, which are patch antennas having directivity and provided on both side surfaces of the device main body 10 of the wireless relay device 1, respectively. The feature is that an antenna device is used.
[0037]
Thus, in the present embodiment, the antenna 5A for the base station and the antenna 5B for the terminal are both directional antennas, thereby increasing the isolation between the antennas 5A and 5B and reducing the suppression of the reception sensitivity due to the self-interference wave. Thus, it is possible to increase the number of lines that can be accommodated per one wireless relay device or the communication speed.
[0038]
(Embodiment 5)
Although the first to fourth embodiments have a structure in which the antennas 5A and 5B are attached to the apparatus main body 10, this embodiment has a base station radio unit (see FIG. 5) provided in the apparatus main body 10 as shown in FIG. A coaxial cable 6A is led out from one side of the apparatus main body 10 as an antenna feed path (not shown), and an antenna 5A for a base station is connected to an end of the coaxial cable 6A, and similarly provided in the apparatus main body 10. A coaxial cable 6B is led out from the other side of the apparatus main body 10 as an antenna feed path of a radio unit (not shown) for a terminal, and the terminal antenna 5B is connected to an end of the coaxial cable 6B. It is characterized in that an antenna device is used in which the antennas 5A and 5B are spaced apart from each other. In this embodiment, a patch antenna having directivity is used as both antennas 5A and 5B as in the fourth embodiment.
[0039]
Thus, in this embodiment, both antennas 5A. By disposing the antennas 5B apart from each other, the isolation between the antennas 5A and 5B is further increased, and the suppression of the reception sensitivity due to the self-interference wave is reduced. It is possible to increase the number of lines that can be accommodated per one wireless relay device or the communication speed.
[0040]
The antenna device to be used may be any of the antenna devices according to the first to third embodiments.
[0041]
(Embodiment 6)
In the first to fifth embodiments, the form of the antenna device used is predetermined, but in the present embodiment, as shown in FIG. A connector 7A for connecting an antenna to an antenna feed line of a base station radio unit (not shown) in the antenna unit 10 and an antenna feed line of a terminal radio unit (not shown) in the apparatus main body 10 on the other side. Is provided with a connector 7B for connecting an antenna, and on the other hand, provided with connected connectors 8A and 8B on the antenna 5A and 5B side, the antennas 5A and 5B can be detached, whereby the antenna device to be used can be selected and connected. It has become.
[0042]
Thus, in the present embodiment, for example, when the desired isolation is not restricted by the antenna device of the first embodiment due to the installation environment, the suppression of the reception sensitivity due to the self-interference wave is reduced by replacing the antenna device of the fifth embodiment with the antenna device of the fifth embodiment. However, it is possible to increase the number of lines that can be accommodated per one wireless relay device or the communication speed. Of course, the antenna devices of Embodiments 2 to 4 may be used depending on the installation environment.
[0043]
(Embodiment 7)
In the sixth embodiment, the antenna device to be used can be selected according to the installation environment. However, the present embodiment has an antenna selecting means for automatically notifying the optimum antenna device to be selected and used. It was made.
[0044]
That is, as shown in FIG. 7, a reception level measurement unit 11 for measuring the reception level of the radio unit 2A connected to the base station antenna 2 and a reception level for counting the reception error are provided in the apparatus main body 10 of the radio relay apparatus 1. An antenna selection unit including an error count unit 12, an optimum antenna determination unit 13, and a buzzer 14 is provided.
[0045]
Thus, based on the reception level measured by the reception level measurement unit 11 and the FER (FrameErrorRatio) measured by the reception error counting unit 12, the optimum antenna determination unit 13 determines the optimum antenna device in the installation environment. The drive of the buzzer 14 is controlled based on the content of the determination, and a notification sound is given according to the content of the determination.
[0046]
FIG. 8 shows a judgment flow of the optimum antenna judging unit 13. When the judgment is started, it is checked whether or not the reception level measured by the reception level measuring unit 11 is less than 30 dBμV, for example (S1). If the level is less than 30 dBμV, it is checked whether or not the error rate is less than 10% (S2). If it is less than 10%, it is notified by a buzzer 14 that the antenna device currently used does not need to be changed. (S3).
[0047]
If the error rate is equal to or more than 10% in the check in S2, the buzzer 14 notifies the buzzer 14 of the replacement of the antenna device with one-step better isolation (S4).
[0048]
If the reception level is equal to or higher than 30 dBμV, it is checked whether the reception level is lower than 40 dBμV (S5). Here, if the reception level is not 40 dBμV, it is checked whether or not the error rate is less than 1% (S6). Notification is made by sound (S7). If the error rate is 1% or more in the check in S6, it is further checked whether the error rate is less than 10% (S8). If the error rate is less than 10%, it is determined that the isolation is one step better. The buzzer 14 informs the user of the replacement with the new antenna device (S9). When the error rate is 10% or more, the buzzer 14 notifies the buzzer 14 of the replacement of the antenna device with the two-stage better isolation (S10).
[0049]
If the reception level is 40 dBμV or more in the check in S5, it is checked whether or not the error rate is less than 10% (S11). The buzzer 14 gives a notification sound (S12). If the error rate is 10% or more in the check in S11, it is further checked whether the error rate is less than 10% (S13). If the error rate is less than 10%, the isolation is better by two steps. The buzzer 14 notifies the buzzer 14 of the replacement of the antenna device (S14). When the error rate is 10% or more, the buzzer 14 notifies the buzzer 14 of the replacement of the antenna device with the three-stage better isolation (S15).
[0050]
In this way, notification of necessity of replacement of the currently connected antenna device and, in the case of replacement, notification of the stage of the antenna device having good isolation with respect to the currently connected antenna device are performed by different buzzers. By notifying with the 14 notification sounds, the user or the installer is prompted to select and connect an antenna device most suitable for the installation environment.
[0051]
Thus, in the present embodiment, it is possible to use the most suitable antenna device for the installation environment, reduce the suppression of the receiving sensitivity due to the self-interfering wave, and increase the number of lines or communication speed that can be accommodated per one wireless relay device. Becomes possible.
[0052]
(Embodiment 8)
In the above-described embodiment 7, the optimum antenna device is notified by the notification sound of the buzzer 14. However, in the present embodiment, as shown in FIG. A display device 15 including a display and the like is provided. That is, the optimum antenna determination unit 13 controls the display of the display device 15 based on the determination content, and notifies the display by displaying a picture or character corresponding to the determination content. The display device 15 is provided with a circuit for generating pictures, characters, and the like.
[0053]
Note that the other configuration and the determination flow of the optimum antenna determination unit 13 are the same as those of the seventh embodiment, and thus description thereof is omitted here.
[0054]
Thus, in the present embodiment, it is possible to use the optimum antenna, reduce the suppression of the reception sensitivity due to the self-interfering wave, and increase the number of lines that can be accommodated per one wireless relay device or the communication speed.
[0055]
(Embodiment 9)
In each of the first to eighth embodiments, the antenna device in which the combination of the base station antenna 5A and the terminal antenna 5B can reduce the reception sensitivity suppression due to the self-interference wave is used. In the embodiment, as shown in FIG. 10, an antenna device using a vertically polarized monopole antenna is used as an antenna 5A for a base station and an antenna 5B for a terminal as in the related art. The attenuator 16 is inserted in the antenna feed path of the antenna 5B for antenna.
[0056]
Thus, in this embodiment, by inserting the attenuator 16 into the terminal antenna 5B, the influence of the interference wave from the base station antenna 5A is reduced, and the interference wave emitted from the terminal antenna 5B is also reduced. be able to.
[0057]
Thus, it is possible to reduce the suppression of the reception sensitivity of the interfering wave of both the antenna 5B for the terminal and the antenna 5A for the base station, and to increase the number of lines that can be accommodated per one wireless relay device or the communication speed.
[0058]
In addition, a radio unit for a base station and a radio unit for a terminal are housed in the apparatus main body 10, as in the case shown in FIG.
[0059]
(Embodiment 10)
In each of Embodiments 1 to 8, the antenna device in which the combination of the base station antenna 5A and the terminal antenna 5B can reduce reception sensitivity suppression due to self-interference is used. The attenuator 16 is inserted into the antenna feed path of the antenna 5B to reduce the reception sensitivity suppression due to the self-interfering wave. However, in the present embodiment, as shown in FIG. The antenna device using a vertically polarized monopole type antenna is used as the antenna 5B for the terminal in the same manner as in the prior art. However, in the radio unit B for the terminal, a variable gain amplifier is used as a transmission amplifier. 17, the gain of the variable gain amplifier 17 is reduced when the communication error on the side of the radio unit 2A for the base station increases, and the transmission power is reduced. It is characterized in that so as to reduce the disturbing wave that is emitted from the not terminal for antenna 5B lowering the reception sensitivity by lowering.
[0060]
Here, corresponding to the receiving unit 20 of the radio unit 2A for the base station, a receiving error counting unit 12 for counting the above-mentioned FER from the demodulated signal received and received, a receiving level measuring unit 11, a receiving error counting unit When the error counted in step 12 is larger than a preset threshold value and the FER level is high despite the reception level of the received wave being sufficiently high, the gain control for controlling the gain of the variable gain amplifier 17 to decrease is performed. A part 19 is provided.
[0061]
On the other hand, the transmission unit 21 of the radio unit 2B for the terminal includes a transmission signal generation unit 22 which takes in the demodulated signal received and demodulated by the reception unit 20 of the radio unit 2A and generates it as a transmission signal; A frequency converter 23 for converting a transmission signal from the receiver 21 into a radio frequency, and the variable gain amplifier 17 described above, and the transmission output of the variable gain amplifier 17 is supplied to the terminal antenna 5B via the transmission / reception switch 24. It has become so. Note that the terminal antenna 5B is connected to the receiving unit 24 by a switching operation of the transmission / reception switch 23 during reception, and the receiving unit 25 receives and demodulates a radio signal from the base station. The radio unit 2A also includes a reception unit 20, a transmission unit 18, and a transmission / reception switch (not shown), but an amplifier having a fixed gain is used as an amplifier for amplifying the transmission output of the transmission unit 18. Used.
[0062]
Thus, when the number of communication errors in the base station radio unit 2A increases beyond a threshold value due to movement of a person around the installation location, movement of furniture, or the like, the measurement level of the reception level measurement unit 11 becomes a predetermined level. The gain control unit 17 controls the gain of the variable gain amplifier 14 to decrease so as to decrease the transmission power of the radio unit 2B for the terminal. As a result, the self-interfering wave emitted from the terminal antenna 5B can be reduced without lowering the reception sensitivity of the radio unit 2A.
[0063]
When the number of communication errors in the base station radio unit 2A is smaller than the threshold value, the gain control unit 17 adjusts the gain of the variable gain amplifier 17 so that the measurement level of the reception level measurement unit 11 becomes a predetermined level. The communication area can be widened by performing large control and increasing the transmission power.
[0064]
As a result, in the present embodiment, the suppression of the reception sensitivity due to the self-interference wave of the antenna 5A for the base station is reduced, and the accommodation per one radio relay apparatus is achieved. The number of possible lines or the communication speed can be increased.
[0065]
(Embodiment 11)
In this embodiment, as shown in FIG. 12, a slot allocated by a base station is detected from a signal received by a receiving unit 20 of a radio unit 2A for a base station, and the used slot is determined by a radio unit for a terminal station. 2B, and a slot control unit 27 that determines a use slot in the transmission unit 21 of the radio unit 2B for the terminal based on the notification from the slot notification unit 18. It is characterized in that it is provided, and an antenna device using a vertically polarized monopole antenna is used as the antenna 5A for the base station and the antenna 5B for the terminal as in the conventional case.
[0066]
Thus, in the present embodiment, when the assigned slot is notified from the slot notifying unit 26 assigned by the base station as shown in FIG. 13, the slot control unit 27 determines the number of slots used in communication with the base station. It is checked whether is 3 or more or less than 3 (S1). Here, the total number of slots used in the PHS is four as described in FIG. If the used slot usage is less than 3, that is, the usage rate is 50% or less, the slot control unit 27 inquires the used slot notifying unit 26 about the slot used for the base station (S2). An unused slot of the base station is arbitrarily allocated to the terminal (S3). After judging whether or not the slot is used for the terminal (S4), if not used, the allocation is completed, and if used, the unused slot is switched to the slot used for the terminal (S5). On the other hand, if the number of used slots in communication with the base station is 3 or more, that is, the usage rate exceeds 50%, an empty slot is arbitrarily selected as a slot to be used for communication with the terminal (S6). Complete the slot assignment.
[0067]
As a result, if the slot usage rate in communication with the base station is 50% or less, suppression of reception sensitivity due to transmission on the terminal side does not occur, and the communication speed can be increased.
[0068]
(Embodiment 12)
In the eleventh embodiment, the slot used by the terminal is assigned and controlled by the slot usage rate in the communication with the base station. In the present embodiment, in addition to the configuration of the eleventh embodiment, FIG. As described above, when the slot utilization is 50% or less, the switching is performed by driving the changeover switches 28A and 28B so that the omnidirectional antennas 5A and 5B are used as the antenna device, and when the slot utilization exceeds 50%. Is characterized in that a configuration for driving the changeover switches 28A and 28B so as to use a switch device composed of antennas 5A and 5B with a coaxial cable is added. Here, directional patch antennas are used as the antennas 5A and 5B with the coaxial cables 6A and 6B. Of course, the antenna devices of Embodiments 1 to 4 may be used.
[0069]
Thus, in the present embodiment, if the slot usage rate is 50% or less, a relayable area similar to that of the conventional wireless relay device using the omnidirectional antennas 5A and 5B can be maintained, and the slot usage rate can be maintained. Exceeds 50%, it is possible to reduce the suppression of the reception sensitivity of the self-interfering wave and to increase the number of lines that can be accommodated per one wireless relay device or the communication speed.
[0070]
(Embodiment 13)
In this embodiment, as shown in FIG. 15, two radio units 2, 2 are provided with reception level measuring units 11, 11, respectively. Are notified to the base station direction determining unit 29 together with the base station ID, and the base station direction determining unit 29 determines the base station direction based on the notification result. That is, one antenna 5 is an antenna for the base station, the other antenna 5 is an antenna for the terminal, and the respective radio units 2 and 2 are for the base station and the terminal.
[0071]
That is, as shown in FIG. 16, during the initial predetermined period when the power is turned on after the wireless relay device 1 of the present embodiment is installed, the radio waves from the peripheral base stations are received by the two radio units 2, 2, and the reception level A peripheral base station search for notifying the reception level measured by the measuring units 11 and the received base station ID to the base station direction determining unit 21 is started (S1), and the peripheral base station search is continuously performed for a certain period of time. Execute.
[0072]
As a result, the base station direction determination unit 21 counts the number of base stations at or above the standby level (for example, 35 dBμV or more) for each radio unit from the notification results corresponding to both antennas 5 and 5 (S2, S3), Thereafter, the numbers A and B of the base stations capable of waiting in both radio units are compared (S4), and the antenna 5 with the larger number of base stations is set as the antenna for the base station and the smaller antenna is set as the antenna for the terminal. Then, the peripheral base station search ends (S5).
[0073]
Thus, in the present embodiment, it is possible to maintain a high reception level at the antenna for the base station, which is generally susceptible to unnecessary radiation, to reduce the effect of reception sensitivity suppression, and to reduce the number of receptions per radio relay apparatus. The number of possible lines or the communication speed can be increased.
[0074]
【The invention's effect】
According to any one of the first to sixth aspects of the present invention, the isolation between the antenna for the base station and the antenna for the terminal is enhanced, the suppression of the reception sensitivity due to the self-interference wave is reduced, and the antenna can be stored in one wireless relay apparatus. There is an effect that the number of lines or the communication speed can be increased.
[0075]
In particular, the invention of claim 7 has an effect that an optimum antenna device that can obtain the above-described effects can be known.
[0076]
The invention according to claim 8 reduces unnecessary radiation to the base station antenna, reduces the influence of unnecessary radiation from the base station antenna, reduces reception sensitivity suppression due to self-interfering waves, and reduces There is an effect that the number of storable lines or the communication speed can be increased.
[0077]
According to the ninth aspect of the invention, there is an effect that reception sensitivity suppression due to a self-interference wave to the base station antenna is reduced, and the number of storable lines or communication speed per one wireless relay device can be increased.
[0078]
According to the tenth aspect, there is an effect that the suppression of the reception sensitivity due to the self-interfering wave is reduced, and the number of storable lines or the communication speed per one wireless relay device can be increased.
[0079]
According to the eleventh aspect of the present invention, by switching to an antenna device according to the installation environment, isolation is increased, reception sensitivity suppression due to self-interference is reduced, and the number of storable lines or communication speed per wireless relay device is reduced. There is an effect that can be increased.
[0080]
According to the twelfth aspect of the present invention, generally, the influence of unnecessary radiation can be maintained at a high reception level at an antenna for a base station, so that the influence of reception sensitivity suppression can be reduced, and a line that can be accommodated per wireless relay apparatus There is an effect that the number or communication speed can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of a wireless relay device according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a wireless relay device according to a second embodiment of the present invention.
FIG. 3 is a perspective view of a wireless relay device according to a third embodiment of the present invention.
FIG. 4 is a perspective view of a wireless relay device according to a fourth embodiment of the present invention.
FIG. 5 is a perspective view of a wireless relay device according to a fifth embodiment of the present invention.
FIG. 6 is a perspective view of a wireless relay device according to a sixth embodiment of the present invention with an antenna device removed.
FIG. 7 is a circuit configuration diagram of a wireless relay device according to a seventh embodiment of the present invention.
FIG. 8 is a flowchart for explaining the operation of the above.
FIG. 9 is a circuit configuration diagram of a wireless relay device according to an eighth embodiment of the present invention.
FIG. 10 is a perspective view of a wireless relay device according to a ninth embodiment of the present invention.
FIG. 11 is a circuit configuration diagram of a wireless relay device according to a tenth embodiment of the present invention.
FIG. 12 is a circuit configuration diagram of a wireless relay device according to Embodiment 11 of the present invention.
FIG. 13 is a flowchart for explaining the above operation.
FIG. 14 is a circuit configuration diagram of a wireless relay device according to a twelfth embodiment of the present invention.
FIG. 15 is a circuit configuration diagram of a wireless relay device according to Embodiment 13 of the present invention.
FIG. 16 is a flowchart for explaining the above operation.
FIG. 17 is a diagram of a communication system using a wireless relay device.
FIG. 18 is a timing chart of a time slot used in the above communication system.
[Explanation of symbols]
1 wireless relay device
5A, 5B antenna
10 Device body

Claims

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. In a wireless relay device that transmits a received signal from a terminal antenna or a base station antenna to a terminal or a base station after reception by an office antenna or a terminal antenna,
A wireless relay device comprising an antenna device installed such that the direction of the polarization plane of the antenna for the base station is different from the direction of the polarization plane of the antenna for the terminal.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
A wireless relay device comprising an antenna device in which the antenna for the base station and the antenna for the terminal are installed so as to face each other in a null direction.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. In a wireless relay device that transmits a received signal from a terminal antenna or a base station antenna to a terminal or a base station after reception by an office antenna or a terminal antenna,
A wireless relay device comprising an antenna device using an omnidirectional antenna as the antenna for the base station and a directional antenna as the antenna for the terminal.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. In a wireless relay device that transmits a received signal from a terminal antenna or a base station antenna to a terminal or a base station after reception by an office antenna or a terminal antenna,
A radio relay apparatus comprising: a directional antenna for each of the antenna for the base station and the antenna for the terminal; and an antenna device installed with different directions of directivity.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
The wireless relay device, wherein the antenna device is provided such that one or both of an antenna for a base station and an antenna for a terminal are connected to a coaxial cable derived from the device main body and both antennas are separated from each other. .

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
In the antenna feed path corresponding to the antenna for the base station and the antenna for the terminal, provided a connecting means for detachably connecting the corresponding antenna,
A first antenna device installed with the direction of the polarization plane of the base station antenna different from the direction of the polarization plane of the terminal antenna, the base station antenna and the terminal antenna are mutually null and A second antenna device installed in a certain direction, a non-directional antenna as the base station antenna, a third antenna device using a directional antenna as the terminal antenna, the base station antenna, A directional antenna is used for each of the terminal antennas, and any one of the fourth antenna devices installed in different directional directions, or any one of the first to fourth antenna devices is used. One or both of the base station antenna and the terminal antenna are connected to a coaxial cable led out of the main unit. Wireless relay apparatus for each antenna of which the antenna device provided at a position away from the apparatus body by means selects connected to said connection means.

An antenna selecting means for selecting an optimum antenna apparatus based on a communication error rate and a received electric field strength in an installation environment, and means for notifying the antenna apparatus selected by the antenna selecting means. Item 7. The wireless relay device according to Item 6.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
A wireless relay device comprising an attenuator inserted into an antenna feed line to which the terminal antenna is connected.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
A receiving error detecting unit that detects a receiving error in a receiving unit that receives a transmission radio wave from the base station via the base station antenna; and a receiving error state detected by the receiving error detecting unit. A wireless relay device comprising: a control unit that adjusts transmission power of a transmission unit that transmits a radio wave via an antenna.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
A wireless relay device comprising slot control means for monitoring a slot usage rate and selecting a used slot for a base station and a terminal so that transmission and reception timings do not overlap.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
A first antenna device installed with the direction of the polarization plane of the base station antenna different from the direction of the polarization plane of the terminal antenna, the base station antenna and the terminal antenna are mutually null and A second antenna device installed in a certain direction, a non-directional antenna as the base station antenna, a third antenna device using a directional antenna as the terminal antenna, the base station antenna, One antenna device including any one of the fourth antenna devices installed using different directional antennas and different directional directions as the terminal antennas, and a base station antenna and a terminal antenna It monitors the slot usage with another antenna device, both of which are omni-directional antennas, and finds that the slot usage is 50 Other antenna device when the following radio relaying apparatus utilization slot, characterized in that an antenna selection means for switching an antenna device when exceeding 50%.

In a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, a radio wave transmitted from a base station or a terminal is used to supplement a weak electric field area as a communication area. After receiving with the antenna for the station or the antenna for the terminal, in the wireless relay device for transmitting the received signal toward the terminal or the base station, from the antenna for the terminal or the antenna for the base station,
Measurement means for measuring the reception level of radio waves arriving from a plurality of surrounding base stations for each antenna using two antennas at the time of installation, and more base stations at a high level from the measurement results of the measurement means. A wireless relay device comprising: means for setting an antenna that can be received as the antenna for the base station and setting the remaining antennas as antennas for the terminal.