JP2002185390A - Communication system for radio base station for internet - Google Patents
Communication system for radio base station for internetInfo
- Publication number
- JP2002185390A JP2002185390A JP2000383698A JP2000383698A JP2002185390A JP 2002185390 A JP2002185390 A JP 2002185390A JP 2000383698 A JP2000383698 A JP 2000383698A JP 2000383698 A JP2000383698 A JP 2000383698A JP 2002185390 A JP2002185390 A JP 2002185390A
- Authority
- JP
- Japan
- Prior art keywords
- radio base
- base station
- antenna
- base stations
- communication system
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、インターネット用
無線基地局の通信システムに関し、特に無線基地局間、
あるいは加入者局と他のエリアの無線基地局間の干渉を
起こり難くしたインターネット用無線基地局の通信シス
テムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for wireless base stations for the Internet.
Alternatively, the present invention relates to a communication system of an Internet radio base station in which interference between a subscriber station and a radio base station in another area hardly occurs.
【０００２】[0002]
【従来の技術】複数の無線基地局を面的に配置し、点在
する加入者局との間で通信を確保しようとする場合、無
線基地局のアンテナとして無指向性のアンテナを用い
る、いわゆるオムニ方式と、該無線基地局に複数の指向
性アンテナを配置して全方角との通信を可能にする、い
わゆるセクター方式が従来から知られている。2. Description of the Related Art When arranging a plurality of radio base stations in a planar manner and trying to secure communication with scattered subscriber stations, a so-called omnidirectional antenna is used as an antenna of the radio base station. An omni system and a so-called sector system in which a plurality of directional antennas are arranged in the wireless base station to enable communication in all directions have been conventionally known.
【０００３】前記オムニ方式は、例えば図４に示されて
いるように、無指向性アンテナを有する３チャネル
の無線基地局を、できるだけ基地局間で信号の干渉が
起きないように配置したものである。一方、前記セクタ
ー方式は、図５に示されているように、各無線基地局に
３個の無線機を配置し、各無線機に、第１、第２、第３
チャネル、、の周波数を送受信する指向性アンテ
ナを、例えば１２０°間隔で配置したものである。In the omni system, for example, as shown in FIG. 4, three-channel radio base stations having an omnidirectional antenna are arranged so that signal interference does not occur between base stations as much as possible. is there. On the other hand, in the sector system, as shown in FIG. 5, three radios are arranged in each radio base station, and the first, second, and third radios are assigned to each radio.
In this example, directional antennas for transmitting and receiving frequencies of channels and are arranged at intervals of, for example, 120 °.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記し
た通信システムは、無線基地局が例えば電柱上といった
高所にアンテナを設けることが多く、利用可能チャネル
数が少ない場合は同一チャネルを使用する基地局同士が
見通し内に存在する事になるため、基地局間干渉が起き
やすいという問題があった。また、雨雲あるいは雨滴を
観測する気象レーダ装置のようなものと周波数を共有す
る場合は、全方角を向いている無線基地局と近くの気象
レーダ装置等との間で干渉が起こりやすいという問題が
あった。また、基地局が全方角を向いているため、加入
者局の設置にあたって、交信可能な近くの無線基地局が
どちらの方角にあるのか分かり難いという問題があっ
た。However, in the communication system described above, the radio base station often has an antenna at a high place such as on a telephone pole, and when the number of available channels is small, the base station uses the same channel. Since they exist in line of sight, there is a problem that interference between base stations is likely to occur. In addition, when the frequency is shared with a weather radar device that observes rain clouds or raindrops, there is a problem that interference is likely to occur between a radio base station facing in all directions and a nearby weather radar device. there were. In addition, since the base station is oriented in all directions, there is a problem that it is difficult to determine in which direction a nearby wireless base station that can communicate is located when installing a subscriber station.
【０００５】本発明は、前記した従来技術の問題点に鑑
みてなされたものであり、その目的は、基地局間干渉あ
るいは近くのレーダ装置との間で干渉が起こり難いイン
ターネット用無線基地局の通信システムを提供すること
にある。他の目的は、加入者局の設置にあたって、無線
基地局の設置位置の方角が分かりやすいインターネット
用無線基地局の通信システムを提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide an Internet radio base station which is less likely to cause interference between base stations or interference with nearby radar devices. A communication system is provided. Another object of the present invention is to provide a communication system of a wireless base station for the Internet, in which the direction of the installation position of the wireless base station is easy to understand when installing the subscriber station.
【０００６】[0006]
【課題を解決するための手段】前記した目的を達成する
ために、本発明は、複数のインターネット用無線基地局
を面的に配置して、複数の加入者局と無線で交信する通
信システムにおいて、前記無線基地局のアンテナに、同
一方角の指向性をもたせた点に第１の特徴がある。この
特徴によれば、同一チャネルの無線基地局間の信号の干
渉を大きく低減することができるようになる。SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a communication system in which a plurality of Internet radio base stations are arranged in a plane to communicate with a plurality of subscriber stations by radio. The first feature is that the antenna of the wireless base station has directivity in the same direction. According to this feature, signal interference between wireless base stations on the same channel can be greatly reduced.
【０００７】また、本発明は、前記無線基地局に複数個
の無線機を設け、各無線機に対応するアンテナの指向性
を、ある方角に対して±９０°以内となるようにした点
に第２の特徴がある。この特徴によれば、同一チャネル
の無線機の信号の干渉を大きく低減できると共に、１つ
の無線基地局のカバーエリアを拡大することができる。Further, the present invention is characterized in that a plurality of radios are provided in the radio base station so that the directivity of an antenna corresponding to each radio is within ± 90 ° with respect to a certain direction. There is a second feature. According to this feature, it is possible to greatly reduce the interference of the signal of the wireless device of the same channel, and to expand the coverage area of one wireless base station.
【０００８】[0008]
【発明の実施の形態】以下に、図面を参照して、本発明
を詳細に説明する。図３は、インターネット用無線基地
局の通信システムの全体構成を示す回路図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 3 is a circuit diagram showing the overall configuration of the communication system of the wireless base station for the Internet.
【０００９】センタ局（サーバまたはルータ）１は、イ
ンターネット接続事業者（ＩＸ）２を経てインターネッ
トに接続されている。また、該センタ局１は、光通信ケ
ーブル等からなるアプローチ回線３１，３２，・・・、３
ｎを介して、複数のインターネット用無線基地局（以
下、「無線基地局」と呼ぶ）４１，４２，・・・、４ｎと
接続されている。各無線基地局には、無線基地局４ｎを
代表として示すように、複数の加入者局５１，５２，・・
・、５ｍが属しており、これらの加入者局と無線交信す
る。なお、該加入者局は、加入者装置ＳＵとパソコンＰ
Ｃを有している。A center station (server or router) 1 is connected to the Internet via an Internet service provider (IX) 2. The center station 1 has approach lines 31, 32,.
, n are connected to a plurality of wireless base stations for the Internet (hereinafter, referred to as “wireless base stations”) 41, 42,. Each of the wireless base stations includes a plurality of subscriber stations 51, 52,... As represented by the wireless base station 4n.
・ 5m belongs and communicates wirelessly with these subscriber stations. The subscriber station comprises a subscriber unit SU and a personal computer P.
C.
【００１０】本発明は前記無線基地局４１，４２，・・
・，４ｎに関するものであり、本発明の一実施形態を、
図１を参照して説明する。図中の矢印は指向性中心を示
し、○数字はチャネル番号を示す。The present invention relates to the radio base stations 41, 42,.
, 4n, and one embodiment of the present invention
This will be described with reference to FIG. The arrow in the figure indicates the directivity center, and the numeral 数字 indicates the channel number.
【００１１】本実施形態では、前記無線基地局４１，４
２，・・・，４ｎのそれぞれに異なる３周波を割り当て、
３チャネルの無線基地局を構成すると共に、該３
チャネルの無線基地局をそれらのカバーエリア
（半径が数１００ｍ）が互いに隣接しないように面配置
する。例えば、東西方向に、ＣＨ（チャネル）１，ＣＨ
２，ＣＨ３，ＣＨ１，ＣＨ２，ＣＨ３，ＣＨ１，・・・
と繰り返し配置し、またＣＨ１とＣＨ２の中間の北側、
南側に一定の距離を離してＣＨ３を配置し、さらに、Ｃ
Ｈ２とＣＨ３の中間の北側、南側に一定の距離を離して
ＣＨ１を配置する。また、無線基地局のアンテナとして
指向性アンテナを用い、各アンテナの指向性（指向性中
心）を同一方角に向ける。In this embodiment, the radio base stations 41, 4
, 4n are assigned to three different frequencies,
A three-channel wireless base station is configured,
The radio base stations of the channels are arranged on a plane such that their coverage areas (radius of several hundred meters) are not adjacent to each other. For example, in the east-west direction, CH (channel) 1, CH
2, CH3, CH1, CH2, CH3, CH1, ...
And the north side between CH1 and CH2,
CH3 is placed at a certain distance to the south, and C3
CH1 is arranged at a certain distance between the north and south sides between H2 and CH3. In addition, a directional antenna is used as an antenna of the wireless base station, and the directivity (directivity center) of each antenna is directed in the same direction.
【００１２】このようにすると、同一周波数を伝送する
無線基地局、すなわち同一チャネルの無線基地局は、ア
ンテナの指向性方角に一列に並ぶことになり、同一チャ
ネルの無線基地局間の信号の干渉を大きく低減できるよ
うになる。例えば、同一チャネルの無線基地局４１，４
２は、アンテナの指向性方角（例えば、南北の方角）に
一列に並ぶことになり、無線基地局４１，４２間の信号
の干渉を大きく低減できるようになる。In this manner, the radio base stations transmitting the same frequency, that is, the radio base stations of the same channel, are arranged in a line in the directionality of the antenna, and signal interference between the radio base stations of the same channel. Can be greatly reduced. For example, radio base stations 41 and 4 of the same channel
2 are arranged in a line in the directionality direction of the antenna (for example, the north-south direction), so that signal interference between the radio base stations 41 and 42 can be greatly reduced.
【００１３】次に、前記無線基地局と加入者局とが配置
される一般の住宅地に前記無線基地局を配置する場合を
考えると、住宅地には道路に電柱が立っていて、多くの
家屋には南側にベランダが設けられている場合が多い。
そこで、電柱に取り付けた無線基地局のアンテナの指向
性を北側に向けると、無線基地局のアンテナと、家屋の
ベランダに設置された加入者局の南向きのアンテナと向
かい合うことになり、無線基地局と加入者局との交信を
高効率で実施できるようになる。Next, considering the case where the wireless base station is located in a general residential area where the wireless base station and the subscriber station are located, a telephone pole stands on a road in a residential area and many Houses often have a veranda on the south side.
Therefore, if the directivity of the antenna of the wireless base station attached to the telephone pole is directed to the north, the antenna of the wireless base station and the south-facing antenna of the subscriber station installed on the veranda of the house will face each other. Communication between the station and the subscriber station can be performed with high efficiency.
【００１４】次に、気象レーダ局等は各地に点在してい
るが、該気象レーダ等が該無線基地局が使用する周波数
帯を共有する場合においては、前記無線基地局のアンテ
ナの指向性を、該気象レーダ局方角とは逆方向に向ける
ようにする。そうすると、気象レーダ局から発射された
同一周波数の信号が無線基地局に及ぼす影響が低減さ
れ、無線基地局と気象レーダ局間の信号の干渉が低減さ
れることになる。Next, weather radar stations and the like are scattered in various places. When the weather radars and the like share a frequency band used by the radio base station, the directivity of the antenna of the radio base station is changed. In the direction opposite to the direction of the weather radar station. Then, the influence of the signal of the same frequency emitted from the weather radar station on the radio base station is reduced, and the signal interference between the radio base station and the weather radar station is reduced.
【００１５】また、前記無線基地局のアンテナの指向性
を、テレビ放送送信塔、すなわちテレビ送信局のアンテ
ナのある方角とは逆方向に向かせるのが好適である。こ
のようにすると、加入者局側から見ると、該無線基地局
は、概ねテレビ送信局のアンテナの方向に存在すること
になり、加入者は、周辺の家屋に設置されているテレビ
アンテナを見て、その方向を中心に数１０°の範囲でア
ンテナを調整すれば、最適な無線基地局の方向に、加入
者局アンテナを向けることができるようになる。このた
め、加入者局のアンテナの向きの設定および調整が簡単
になる。また、無線基地局からの送信信号をテレビアン
テナで受信し、屋内のテレビコンセントに測定器を接続
すれば、屋根上での受信可能性を、屋根に登らずに確認
できるようになる。It is preferable that the directivity of the antenna of the radio base station is directed in a direction opposite to a direction where the antenna of the television broadcast transmitting tower, that is, the antenna of the television transmitting station is located. In this case, when viewed from the subscriber station side, the radio base station is located substantially in the direction of the antenna of the television transmitting station, and the subscriber can view the television antenna installed in the surrounding house. If the antenna is adjusted within a range of several tens of degrees around that direction, the antenna of the subscriber station can be directed toward the optimal direction of the radio base station. This simplifies the setting and adjustment of the antenna orientation of the subscriber station. Also, if a transmission signal from a wireless base station is received by a television antenna and a measuring instrument is connected to an indoor television outlet, it is possible to confirm the possibility of reception on the roof without climbing the roof.
【００１６】次に、本発明の第２実施形態を、図２を参
照して説明する。この実施形態は、１カ所の無線基地局
に２個の無線機と、それぞれに対応する２つのアンテナ
を設け、該２つのアンテナの組み合わせにより、概ね１
方向（例えば、北側）に指向性を持たせるようにしたも
のである。なお、図中の矢印は指向性中心、○数字はチ
ャネル番号を示す。Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, one radio base station is provided with two radios and two antennas corresponding to the radios, respectively.
The direction (for example, the north side) has directivity. The arrows in the figure indicate the directivity centers, and the numbers indicate channel numbers.
【００１７】この実施形態では、各無線基地局に片側２
セクタアンテナを配置する。すなわち、ある方角（例え
ば、北側）に対して、２つのアンテナの指向性中心がそ
れぞれ±９０°以内に入るようにする。なお、図示の例
では、二つのアンテナが、前記ある方角に対してそれぞ
れ±４５°となるように配置されている。そして、各ア
ンテナの指向性が、図示されているように、同方角を向
くようにする。そうすると、前記第１実施形態と同様
に、無線基地局の同一チャネル同士、あるいは異なるチ
ャネルのアンテナはほぼ一直線上に、かつ同方角に並ぶ
ことになり、同一チャネルの無線基地局間の干渉を低減
することができるようになる。また、本実施形態によれ
ば、前記第１実施形態に比べて、１つの無線基地局がカ
バーするエリアを拡大することができるようになり、１
基地局（サイト）当たりの加入者容量を増やすことがで
きるようになる。In this embodiment, each radio base station has one side 2
Place a sector antenna. That is, the directional centers of the two antennas are each set within ± 90 ° with respect to a certain direction (for example, the north side). In the illustrated example, the two antennas are arranged so as to be at ± 45 ° with respect to the certain direction. Then, the directivity of each antenna is oriented in the same direction as shown in the figure. Then, similarly to the first embodiment, the antennas of the same channel of the radio base station or the antennas of different channels are arranged substantially in a straight line and in the same direction, thereby reducing interference between radio base stations of the same channel. Will be able to Further, according to the present embodiment, the area covered by one radio base station can be expanded as compared with the first embodiment, and
It becomes possible to increase the subscriber capacity per base station (site).
【００１８】この実施形態の無線基地局配置を実際の住
宅地に敷設する場合には、第１実施形態で説明したよう
に、該無線基地局は道路際に立てられている電柱上に設
置し、一方家屋は南側にベランダを持ち該ベランダに加
入者局のアンテナが設置される場合が多いから、前記２
セクタアンテナの指向性中心が北側を向くように、換言
すれば２セクタアンテナの各々は、それぞれ、北東およ
び北西方角を向くように設置するのが好適である。When the radio base station of this embodiment is laid in an actual residential area, as described in the first embodiment, the radio base station is installed on a telephone pole standing on the road. On the other hand, a house often has a veranda on the south side and an antenna of a subscriber station is installed on the veranda.
The two-sector antennas are preferably installed so that the directivity center of the sector antenna faces the north side, in other words, each of the two-sector antennas faces the northeast and northwest directions, respectively.
【００１９】次に、各地に点在する気象レーダ局等の影
響を受ける地域においては、無線基地局の２セクタアン
テナの指向性の中心を、該気象レーダ局の方角とは逆方
向に向けるようにする。そうすると、気象レーダ局から
発射された同一周波数の信号が無線基地局に及ぼす影響
が低減され、無線基地局と気象レーダ局間の信号の干渉
が低減されることになる。Next, in an area affected by a weather radar station or the like scattered in various places, the center of the directivity of the two-sector antenna of the radio base station is directed in a direction opposite to the direction of the weather radar station. To Then, the influence of the signal of the same frequency emitted from the weather radar station on the radio base station is reduced, and the signal interference between the radio base station and the weather radar station is reduced.
【００２０】また、本実施形態においても、前記２セク
タアンテナの指向性中心を、テレビ送信局アンテナの方
向と逆方向に向くようにするのが好適である。このよう
にすると、第１実施形態で述べたと同じ理由で、加入者
局のアンテナの向きの設定および調整が簡単になる。ま
た、無線基地局からの送信信号をテレビアンテナで受信
し、屋内のテレビコンセントに測定器を接続すれば、屋
根上での受信可能性を、屋根に登らずに確認できるよう
になる。Also in the present embodiment, it is preferable that the directivity center of the two-sector antenna is oriented in a direction opposite to the direction of the television transmitting station antenna. This simplifies the setting and adjustment of the antenna direction of the subscriber station for the same reason as described in the first embodiment. Also, if a transmission signal from a wireless base station is received by a television antenna and a measuring instrument is connected to an indoor television outlet, it is possible to confirm the possibility of reception on the roof without climbing the roof.
【００２１】なお、本実施形態では、１つの無線基地局
に２個の無線機を置く例で説明したが、２個以上であっ
ても良い。In this embodiment, an example has been described in which two radios are provided in one radio base station, but two or more radios may be provided.
【００２２】以上、本発明の好ましい実施形態を説明し
たが、本発明はこれに限定されることなく種々の変形が
可能であり、該変形も本発明に含まれることは勿論であ
る。Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible, and the modification is of course included in the present invention.
【００２３】[0023]
【発明の効果】以上の説明から明らかなように、本発明
によれば、面的に配置された無線基地局のアンテナの指
向性を同一方向に向けるだけで、無線基地局間の信号の
干渉を大きく低減できるという効果がある。利用できる
チャネル数が限られていて、比較的短距離間隔で同一チ
ャネルを繰り返し利用せざるをえない場合に、特に有効
である。As is apparent from the above description, according to the present invention, signal interference between radio base stations can be achieved only by directing the directivity of the antennas of the radio base stations arranged in a plane in the same direction. Can be greatly reduced. This is particularly effective when the number of available channels is limited and the same channel has to be used repeatedly at relatively short intervals.
【００２４】また、前記同一方向を北向きにすると、概
ね南向きのアンテナを備えた加入者局に対して、高効率
で交信することができるようになる。また、気象観測用
レーダ装置等から出力される同一周波数帯の信号の影響
を受けない無線基地局を提供することができるようにな
る。Further, when the same direction is directed to the north, it becomes possible to efficiently communicate with a subscriber station provided with a generally south-facing antenna. In addition, it is possible to provide a wireless base station that is not affected by signals in the same frequency band output from a weather observation radar device or the like.
【００２５】また、本発明によれば、各無線基地局のア
ンテナの指向性が同一方角を向いているので、加入者局
のアンテナの設置にあたって、無線基地局の設置位置の
方角が分かりやすいという効果がある。 特に、該無線
基地局のアンテナの指向性を、テレビ放送局のアンテナ
の方角と逆方向にすると、その効果は大きい。According to the present invention, since the directivity of the antenna of each radio base station is oriented in the same direction, the direction of the installation position of the radio base station can be easily understood when installing the antenna of the subscriber station. effective. In particular, when the directivity of the antenna of the radio base station is set to be opposite to the direction of the antenna of the television broadcast station, the effect is large.
【図１】 本発明の一実施形態の無線基地局配置および
アンテナの指向性を示す図である。FIG. 1 is a diagram showing the arrangement of radio base stations and the directivity of an antenna according to an embodiment of the present invention.
【図２】 本発明の第２実施形態の無線基地局配置およ
びアンテナの指向性を示す図である。FIG. 2 is a diagram illustrating the arrangement of radio base stations and the directivity of an antenna according to a second embodiment of the present invention.
【図３】 インターネット無線通信システムの一例を示
すブロック図である。FIG. 3 is a block diagram illustrating an example of an Internet wireless communication system.
【図４】 従来のオムニ方式の説明図である。FIG. 4 is an explanatory diagram of a conventional omni system.
【図５】 従来のセクタ方式の説明図である。FIG. 5 is an explanatory diagram of a conventional sector system.
１・・・センタ局、２・・・インターネット接続事業者、３１
〜３ｎ・・・アプローチ回線、４１〜４ｎ・・・無線基地局、
５１〜５ｎ・・・加入者局。1 ... Center station, 2 ... Internet connection operator, 31
... 3n ... approach line, 41-4n ... radio base station,
51-5n ... subscriber stations.
Claims (6)
的に配置して、複数の加入者局と無線で交信する通信シ
ステムにおいて、 前記無線基地局のアンテナに、同一方角の指向性をもた
せたことを特徴とするインターネット用無線基地局の通
信システム。1. A communication system in which a plurality of wireless base stations for the Internet are arranged in a plane to communicate with a plurality of subscriber stations wirelessly, wherein the antennas of the wireless base stations have directivity in the same direction. A communication system for a wireless base station for the Internet.
を特徴とする請求項１に記載のインターネット用無線基
地局の通信システム。2. The communication system according to claim 1, wherein the same direction is substantially a north direction.
け、各無線機に対応するアンテナの指向性を、ある方角
に対して±９０°以内となるようにしたことを特徴とす
る請求項１に記載のインターネット用無線基地局の通信
システム。3. The wireless base station according to claim 2, wherein a plurality of wireless devices are provided, and the directivity of an antenna corresponding to each wireless device is within ± 90 ° with respect to a certain direction. Item 2. A communication system for a wireless base station for the Internet according to item 1.
を特徴とする請求項３に記載のインターネット用無線基
地局の通信システム。4. The communication system according to claim 3, wherein the direction is substantially north.
設置されたレーダ装置と同一周波数帯を共有するもので
あり、前記同一方角が、近傍のレーダ装置のある方角と
は反対方向であることを特徴とする請求項１に記載のイ
ンターネット用無線基地局の通信システム。5. The radio base station, wherein the radio base station shares the same frequency band with a radar device installed for weather observation or the like, wherein the same direction is opposite to a direction of a nearby radar device. 2. The communication system for a wireless base station for the Internet according to claim 1, wherein:
れているテレビ放送送信塔のある方角とは反対方角であ
ることを特徴とする請求項１に記載のインターネット用
無線基地局の通信システム。6. The communication system according to claim 1, wherein the same direction is a direction opposite to a direction in which a television broadcasting transmission tower being serviced in the area is located.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000383698A JP2002185390A (en) | 2000-12-18 | 2000-12-18 | Communication system for radio base station for internet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000383698A JP2002185390A (en) | 2000-12-18 | 2000-12-18 | Communication system for radio base station for internet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002185390A true JP2002185390A (en) | 2002-06-28 |
Family
ID=18851313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000383698A Pending JP2002185390A (en) | 2000-12-18 | 2000-12-18 | Communication system for radio base station for internet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002185390A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009534972A (en) * | 2006-04-26 | 2009-09-24 | ノキア コーポレイション | Use of spectrum in wireless systems |
-
2000
- 2000-12-18 JP JP2000383698A patent/JP2002185390A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009534972A (en) * | 2006-04-26 | 2009-09-24 | ノキア コーポレイション | Use of spectrum in wireless systems |
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