JPH06303238A - Transmission/reception device for radio data transmission - Google Patents
Transmission/reception device for radio data transmissionInfo
- Publication number
- JPH06303238A JPH06303238A JP11118093A JP11118093A JPH06303238A JP H06303238 A JPH06303238 A JP H06303238A JP 11118093 A JP11118093 A JP 11118093A JP 11118093 A JP11118093 A JP 11118093A JP H06303238 A JPH06303238 A JP H06303238A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- transmission
- signal
- data
- central station
- 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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- Small-Scale Networks (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は無線データ伝送用送受信
装置に係り、特に制御方式が集中方式である無線ＬＡＮ
（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）システム用
送受信装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter / receiver for wireless data transmission, and more particularly to a wireless LAN whose control system is a centralized system.
The present invention relates to a transmitter / receiver for a (Local Area Network) system.
【０００２】[0002]
【従来の技術】従来の伝送速度１０Ｍｂｐｓ以上の無線
ＬＡＮシステムでは、伝送方式としては時分割複信方式
を，無線周波数としては準ミリ波帯を，制御方式として
は集中方式を採用したシステムが製品化され、標準化も
検討されている。2. Description of the Related Art In a conventional wireless LAN system having a transmission rate of 10 Mbps or more, a system adopting a time division duplex system as a transmission system, a quasi-millimeter wave band as a radio frequency, and a centralized system as a control system is a product. And standardization is being considered.
【０００３】従来の無線ＬＡＮシステムは、図３に示す
ように有線ＬＡＮ、例えば、ＩＳＯ８０２−３イーサネ
ット４３とのインタフェース装置４１と、端末とのイン
タフェース装置４２ａ，４２ｂを有し、このインタフェ
ース装置４２ａ，４２ｂはパーソナルコンピュータ４４
ａ，４４ｂとそれぞれ接続されている。そして、有線Ｌ
ＡＮとのインタフェース装置４１と端末とのインタフェ
ース装置４２とは準ミリ波帯の無線信号４５で制御情報
と伝送データが授受される。As shown in FIG. 3, a conventional wireless LAN system has an interface device 41 for a wired LAN, for example, an ISO 802-3 Ethernet 43, and interface devices 42a, 42b for a terminal. 42b is a personal computer 44
a and 44b, respectively. And wire L
Control information and transmission data are exchanged between the interface device 41 with the AN and the interface device 42 with the terminal by a radio signal 45 in the quasi-millimeter wave band.
【０００４】ここで、準ミリ波帯の無線信号４５は、伝
送方式として時分割複信が採用されているので、同一周
波数が使用され、従来の時分割複信方式でのフレーム構
成を示す説明図である図４に示すように、１フレームを
上りと下りで分割してサブフレームとして使用してい
る。この図４の５１および５２は、例えば、有線ＬＡＮ
とのインタフェース装置４１から端末とのインタフェー
ス装置４２へ伝送される制御信号およびデータで、５２
は制御信号５１と同じ方向のデータである。５３および
５４は逆方向へ伝送されるデータおよび制御信号で、５
３は制御信号５１と逆方向のデータであり、５４はこの
データ５３と同じ方向の制御信号である。The quasi-millimeter wave radio signal 45 uses time division duplex as a transmission method, so that the same frequency is used and a frame structure in the conventional time division duplex method is described. As shown in FIG. 4, which is a diagram, one frame is divided into upstream and downstream and used as a subframe. Reference numerals 51 and 52 in FIG. 4 are, for example, a wired LAN.
The control signal and data transmitted from the interface device 41 with the terminal to the interface device 42 with the terminal are 52
Is data in the same direction as the control signal 51. Data and control signals 53 and 54 are transmitted in the opposite direction.
Reference numeral 3 is data in the opposite direction to the control signal 51, and reference numeral 54 is a control signal in the same direction as the data 53.
【０００５】そして、各方向の信号は有線ＬＡＮとのイ
ンタフェース装置４１，端末とのインタフェース装置４
２とも、装置内送受信部の準ミリ波入出力部とアンテナ
間に設けられた高周波切替器（図示せず）を同期して切
替えることにより、両装置を入出力する。このような無
線ＬＡＮシステムは、例えば、オーム社発行のコンピュ
ータ＆ネットワークＬＡＮ，１９９２年９月号に開示さ
れている。Signals in each direction are interface device 41 with the wired LAN and interface device 4 with the terminal.
In both cases, a high-frequency switching unit (not shown) provided between the quasi-millimeter wave input / output unit of the in-device transmission / reception unit and the antenna is synchronously switched to input / output both devices. Such a wireless LAN system is disclosed, for example, in Computer & Network LAN, September 1992, published by Ohmsha.
【０００６】[0006]
【発明が解決しようとする課題】この従来の無線ＬＡＮ
システムでは、伝送方式として時分割複信を採用してい
るため、各フレームを上り用制御信号とデータ，下り用
制御信号とデータのサブフレームに分割使用しており、
上り方向，下り方向とも制御信号とデータの伝送に１フ
レームを分割して使用している。このため、上り，下り
のデータ伝送量に応じてサブフレームの長さを変更し、
上り，下りの割合を動的に変更しても全体の伝送量は信
号速度で制限されるという問題があった。また、伝送方
式を周波数分割複信として、信号伝送路を上り，下り別
々としても、必要となる無線周波数帯域が２倍となり、
無線周波数の有効利用という点で問題があった。[Problems to be Solved by the Invention] This conventional wireless LAN
Since the system uses time division duplex as a transmission method, each frame is divided into sub-frames of an upstream control signal and data and a downstream control signal and data.
One frame is used for transmission of control signals and data in both the up and down directions. Therefore, the length of the subframe is changed according to the amount of data transmission in the uplink and downlink,
Even if the ratio of upstream and downstream is dynamically changed, the total transmission amount is limited by the signal rate. In addition, even if the transmission method is frequency division duplex and the signal transmission path is made up and down separately, the required radio frequency band is doubled,
There was a problem in terms of effective use of radio frequencies.
【０００７】本発明はかかる問題を解決するためになさ
れたもので、端末から集中局へは空間光信号を用いてデ
ータ伝送容量を拡大する無線データ伝送用送受信装置を
得ることを目的とする。The present invention has been made to solve the above problems, and an object of the present invention is to obtain a wireless data transmission / reception device for expanding the data transmission capacity from a terminal to a central station by using a spatial optical signal.
【０００８】[0008]
【課題を解決するための手段】本発明の無線データ伝送
用送受信装置は、１台の集中局送受信装置と複数台の端
末送受信装置との間で、無線データ伝送を行う通信方式
において、上記集中局送受信装置は１台の無線信号送信
部と、複数台の空間光信号受信部と、上記無線信号送信
部と上記空間光信号受信部とを接続したデータ処理部よ
りなり、上記端末送受信装置は１台の空間光信号送信部
と、１台の無線信号受信部と、上記空間光信号送信部と
上記無線信号受信部とを接続したデータ処理部よりな
り、集中局から端末へのデータ送信は無線信号を用い、
端末から集中局へは空間光信号を用い、かつ端末から集
中局へは同時に複数端末からのデータ送信を行うように
したものである。SUMMARY OF THE INVENTION A transceiver for wireless data transmission according to the present invention is a communication system for performing wireless data transmission between one central station transceiver and a plurality of terminal transceivers. The station transmitter / receiver comprises one radio signal transmitter, a plurality of spatial optical signal receivers, and a data processor connecting the radio signal transmitters and the spatial optical signal receivers. The spatial light signal transmission unit, the wireless signal reception unit, and the data processing unit connecting the spatial light signal transmission unit and the wireless signal reception unit are connected to each other. Using a radio signal,
A spatial optical signal is used from a terminal to a central station, and data is simultaneously transmitted from a plurality of terminals to the central station.
【０００９】[0009]
【作用】本発明においては、上りと下りに別々の伝送路
を用い、端末から集中局方向への上りは空間光伝送を用
い、かつ集中局の空間光信号受信部を複数とすること
で、上りは同時に複数の伝送路を使用し、集中局から端
末方向への下りは無線伝送を用いる。In the present invention, separate transmission paths are used for upstream and downstream, spatial optical transmission is used for upstream from the terminal to the central station, and a plurality of spatial optical signal receivers of the central station are provided. Uplink uses a plurality of transmission paths at the same time, and downlink from the central station to the terminal uses wireless transmission.
【００１０】[0010]
【実施例】つぎに本発明について図面を参照して説明す
る。図１は本発明による無線データ伝送用送受信装置の
実施例を示すブロック図で、（ａ）は集中局の送受信装
置の構成例を示したものであり、（ｂ）は端末送受信装
置の構成例を示したものである。図１の（ａ）におい
て、集中局送受信装置１は、端末送受信装置からの空間
光信号６1・・・６nをそれぞれ受信し光信号を電気信号
に変換し復調する空間光信号受信部２1・・・２nと、空
間光信号７を送信する無線信号送信部３と、この無線信
号送信部３と複数台の空間光信号受信部２1・・・２nと
を接続したデータ処理部４を有している。５1・・・５n
は空間光信号受信部２1・・・２nとデータ処理部４を接
続する通信ケーブル、８，９は有線ＬＡＮとのインタフ
ェース信号である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a transceiver for wireless data transmission according to the present invention, (a) showing an example of the configuration of a transceiver of a central station, and (b) showing an example of the configuration of a terminal transceiver. Is shown. In FIG. 1A, a central station transmitting / receiving apparatus 1 receives a spatial optical signal 6 1 ... 6 n from a terminal transmitting / receiving apparatus, converts the optical signal into an electric signal, and demodulates the spatial optical signal receiving unit 2 1 ... 2 n , a radio signal transmitting section 3 for transmitting the spatial optical signal 7, and data processing in which the radio signal transmitting section 3 and a plurality of spatial optical signal receiving sections 2 1 ... 2 n are connected It has a section 4. 5 1 ... 5 n
Is a communication cable for connecting the spatial light signal receiving units 2 1 ... 2 n and the data processing unit 4, and 8 and 9 are interface signals with the wired LAN.
【００１１】図１の（ｂ）において、端末送受信装置１
１は、（ａ）に示す集中局送受信装置１よりの無線信号
１６を受信し復調する無線信号受信部１２と、空間光信
号１７を送信する空間光信号送信部１３と、この無線信
号受信部１２と空間光信号送信部１３とを接続したデー
タ処理部１４を有している。１５はデータ処理部１４と
空間光信号送信部１３を接続する通信ケーブル、１８，
１９は携帯型パーソナルコンピュータ等の機器とのイン
タフェース信号である。In FIG. 1B, the terminal transmitting / receiving apparatus 1
Reference numeral 1 denotes a radio signal receiving section 12 for receiving and demodulating a radio signal 16 from the central station transmitting / receiving apparatus 1 shown in (a), a spatial optical signal transmitting section 13 for transmitting a spatial optical signal 17, and this radio signal receiving section. It has a data processing unit 14 that connects 12 and the spatial light signal transmission unit 13. 15 is a communication cable for connecting the data processing unit 14 and the spatial light signal transmitting unit 13, 18,
Reference numeral 19 is an interface signal with a device such as a portable personal computer.
【００１２】なお、このように構成された端末送受信装
置は複数台（図示せず）分散配置され、１台の集中局送
受信装置との間でデータ伝送するように構成されてい
る。そして、この図１の（ａ）に示す集中局送受信装置
１と（ｂ）に示す端末送受信装置１１においては、集中
局から端末へのデータ送信は無線信号を用い、端末から
集中局へは空間光信号を用い、かつ端末から集中局へは
同時に複数端末からのデータ送信を行うように構成され
ている。A plurality of (not shown) terminal transmission / reception devices configured as described above are distributed and arranged so as to transmit data to / from one central station transmission / reception device. In the central station transmitter / receiver 1 shown in FIG. 1A and the terminal transmitter / receiver 11 shown in FIG. 1B, a wireless signal is used for data transmission from the central station to the terminal, and a space is transmitted from the terminal to the central station. It is configured to use an optical signal and simultaneously perform data transmission from a plurality of terminals to the central station.
【００１３】つぎにこの図１に示す実施例の動作を説明
する。まず、図１の（ａ）に示す集中局送受信装置１に
おいて、図１の（ｂ）に示す端末送受信装置１１からの
空間光信号６は空間光信号受信部２で光信号から電気信
号に変換されたのち復調され、信号ケーブル５を通りデ
ータ処理部４へ伝えられ受信データが取り出される。そ
して、端末送受信装置１１へ伝送されるデータは、デー
タ処理部４で送信データが作成され無線信号送信部３で
変調されて、無線信号７として端末送受信装置１１へ送
られる。Next, the operation of the embodiment shown in FIG. 1 will be described. First, in the central station transmitter / receiver 1 shown in FIG. 1A, the spatial optical signal 6 from the terminal transmitter / receiver 11 shown in FIG. 1B is converted from an optical signal into an electric signal by the spatial optical signal receiver 2. After being demodulated, it is demodulated and transmitted to the data processing section 4 through the signal cable 5 to take out the received data. Then, the data transmitted to the terminal transmission / reception device 11 is transmitted to the terminal transmission / reception device 11 as a radio signal 7 after transmission data is created by the data processing unit 4, modulated by the radio signal transmission unit 3.
【００１４】つぎに、図１の（ｂ）に示す端末送受信装
置１１において、図１の（ａ）に示す集中局送受信装置
１よりの無線信号１６は無線信号受信部１２で復調され
てデータ処理部１４へ送られ、受信データが取り出され
る。そして、集中局送受信装置１へ伝送される送信デー
タは、データ処理部１４で作成され、信号ケーブル１５
を通り空間光信号送信部１３で変調され空間光信号１７
として集中局送受信装置１へ伝送される。Next, in the terminal transmitter / receiver 11 shown in FIG. 1B, the radio signal 16 from the central station transmitter / receiver 1 shown in FIG. The data is sent to the unit 14 and the received data is taken out. Then, the transmission data to be transmitted to the central station transmitting / receiving device 1 is created by the data processing unit 14, and is transmitted by the signal cable 15
And the spatial light signal 17 modulated by the spatial light signal transmitter 13
Is transmitted to the central station transmitting / receiving device 1.
【００１５】図２は本発明の無線データ伝送用送受信装
置の配置例を示す説明図である。つぎにこの図２により
以上説明した無線ＬＡＮ用送受信装置使用時の配置の例
を説明する。この図２で２１は図１（ａ）に示す集中局
送受信装置１の無線信号送信部３とデータ処理部４であ
る。２２は図１（ａ）の空間光信号受信部２、２４は図
１（ａ）の信号ケーブル５、２３は図１（ｂ）の端末送
受信装置１１である。図２の３１は図１の無線信号送信
部３から無線信号受信部１２への無線信号、図２の３２
は図１の空間光信号送信部１３から空間光信号受信部２
への空間光信号である。図２の３３は図１の集中局送受
信装置１から端末送受信装置１１への無線信号３１の到
達範囲、図２の３４は図１の端末送受信装置１１から集
中局送受信装置１への空間光信号の到達範囲である。FIG. 2 is an explanatory view showing an example of arrangement of the transceiver for wireless data transmission of the present invention. Next, an example of the arrangement when the above-described wireless LAN transmitting / receiving device is used will be described with reference to FIG. In FIG. 2, reference numeral 21 denotes the radio signal transmitting unit 3 and the data processing unit 4 of the central station transmitting / receiving apparatus 1 shown in FIG. Reference numeral 22 is the spatial light signal receiving unit 2 of FIG. 1A, 24 is the signal cable 5 of FIG. 1A, and 23 is the terminal transmitting / receiving apparatus 11 of FIG. 1B. Reference numeral 31 in FIG. 2 denotes a radio signal from the radio signal transmitting unit 3 in FIG. 1 to the radio signal receiving unit 12, 32 in FIG.
Is from the spatial light signal transmitter 13 to the spatial light signal receiver 2 in FIG.
Is the spatial light signal to. Reference numeral 33 in FIG. 2 indicates the reach of the radio signal 31 from the central station transceiver apparatus 1 to the terminal transceiver apparatus 11 in FIG. 1, and 34 in FIG. 2 is a spatial optical signal from the terminal transceiver apparatus 11 to the central station transceiver apparatus 1 in FIG. Is the reach of.
【００１６】つぎに、以上説明した無線ＬＡＮ用送受信
装置の構成および機器配置の実施例をもとに、動作例に
ついて説明する。まず、「上り伝送路」，「下り伝送
路」について説明する。いま、図１の端末送受信装置１
１における空間光信号送信部１３から図１の集中局送受
信装置１における空間光信号受信部２への空間光信号に
よる伝送路を「上り伝送路」とすると、集中局の複数の
空間光信号受信部ごとに伝送路があり、同時にデータを
送ることができる構成となっている。Next, an operation example will be described based on the embodiment of the configuration and equipment arrangement of the wireless LAN transmitting / receiving apparatus described above. First, the "uplink transmission path" and the "downlink transmission path" will be described. Now, the terminal transmission / reception device 1 of FIG.
If the transmission path of the spatial optical signal from the spatial optical signal transmitting section 13 in 1 to the spatial optical signal receiving section 2 in the central station transmitting / receiving apparatus 1 of FIG. There is a transmission path for each unit, and the data can be sent at the same time.
【００１７】そして、集中局の空間光信号受信部２はア
ドレスを持っていて、端末送受信装置はどの空間光信号
受信部へデータを送出しているかを初期設定により記憶
する。「上り伝送路」では伝送路単位にアクセス制御が
必要である。いま、図１の集中局送受信装置１における
無線信号送信部３から図１の端末送受信装置１１におけ
る無線信号受信部１２への無線信号による伝送路を「下
り伝送路」とすると、これは集中局から端末への同報送
信のためアクセス制御は必要ない。The spatial optical signal receiving unit 2 of the centralized station has an address, and the terminal transmitting / receiving device stores to which spatial optical signal receiving unit the data is transmitted by initial setting. The "upstream transmission line" requires access control for each transmission line. Now, assuming that the transmission path by the radio signal from the radio signal transmitting section 3 in the central station transmitting / receiving apparatus 1 in FIG. 1 to the radio signal receiving section 12 in the terminal transmitting / receiving apparatus 11 in FIG. Access control is not required because the broadcast is sent from the terminal to the terminal.
【００１８】つぎに、端末から集中局へのデータ伝送の
動作例を説明する。 （１）端末送受信装置の初期設定 使用開始時に、図１の空間光信号受信部２のアドレスを
確認する。続いて、下り伝送路の制御信号により上り伝
送路の通信状態を監視する。 （２）対向となる特定アドレスの集中局空間光信号受信
部が通信状態でないことを下り伝送路の制御信号から確
認し、端末から集中局へデータを送出する。Next, an operation example of data transmission from the terminal to the central station will be described. (1) Initial Setting of Terminal Transmitting / Receiving Device At the start of use, the address of the spatial light signal receiving unit 2 in FIG. 1 is confirmed. Then, the communication state of the uplink transmission line is monitored by the control signal of the downlink transmission line. (2) It is confirmed from the control signal of the downlink transmission line that the central station spatial optical signal receiving unit of the opposing specific address is not in communication, and the data is transmitted from the terminal to the central station.
【００１９】（３）他の端末とのデータ衝突がなく、続
けてデータを送るときは（２）の手順から行う。 （４）特定アドレスの集中局空間光信号受信部へ複数の
端末送受信装置からデータが送られたときは、集中局送
受信装置１はデータの衝突を識別し、下り伝送路を用い
て端末へ衝突情報を通報する。 （５）端末はデータの送出を中止し、一定時間の後、再
度（２）からの手順を行う。 また、集中局から端末へのデータ伝送は、上り伝送路の
使用状態の通知も含めて常時行う。(3) When there is no data collision with another terminal and data is continuously transmitted, the procedure from (2) is performed. (4) When data is transmitted from a plurality of terminal transceivers to the central station spatial optical signal receiving unit of a specific address, the central station transceiver 1 identifies the data collision and collides with the terminal using the downlink transmission path. Report information. (5) The terminal stops data transmission, and after a certain period of time, repeats the procedure from (2). In addition, data transmission from the central station to the terminal is always performed, including notification of the usage state of the upstream transmission path.
【００２０】[0020]
【発明の効果】以上説明したように本発明は、集中方式
無線ＬＡＮ用送受信装置において、集中局から端末への
データ送信は無線信号を用い、端末から集中局へは空間
光信号を用い、かつ端末から集中局へは同時に複数端末
からのデータ送信を行うようにしたので、無線信号は１
波のみでありながら時分割複信方式に比べてデータ伝送
容量を拡大することができるという効果を有する。As described above, according to the present invention, in a transceiver for a centralized wireless LAN, a wireless signal is used for data transmission from a central station to a terminal, and a spatial optical signal is used from the terminal to the central station, and Since data is transmitted from multiple terminals to the central station at the same time, the wireless signal is
This has an effect that the data transmission capacity can be expanded as compared with the time division duplex method, although only the wave is used.
【図１】本発明による無線データ伝送用送受信装置の一
実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a transceiver for wireless data transmission according to the present invention.
【図２】本発明の無線データ伝送用送受信装置の配置例
を示す説明図である。FIG. 2 is an explanatory diagram showing an arrangement example of a wireless data transmission / reception device of the present invention.
【図３】従来の無線ＬＡＮシステムの一例を示すブロッ
ク図である。FIG. 3 is a block diagram showing an example of a conventional wireless LAN system.
【図４】従来の時分割複信方式でのフレーム構成例を示
す説明図である。FIG. 4 is an explanatory diagram showing a frame configuration example in a conventional time division duplex system.
【符号の説明】 １ 集中局送受信装置 ２1〜２n 空間光信号受信部 ３ 無線信号送信部 ４ データ処理部 ５1〜５n 信号ケーブル １１ 端末送受信装置 １２ 無線信号受信部 １３ 空間光信号送信部 １４ データ処理部 １５ 信号ケーブル[Explanation of Codes] 1 Central Station Transmitter / Receiver 2 1 to 2 n Spatial Optical Signal Receiver 3 Radio Signal Transmitter 4 Data Processor 5 1 to 5 n Signal Cable 11 Terminal Transmitter / Receiver 12 Radio Signal Receiver 13 Spatial Optical Signal Transmitter Part 14 data processing part 15 signal cable
Claims (1)
送受信装置との間で、無線データ伝送を行う通信方式に
おいて、前記集中局送受信装置は１台の無線信号送信部
と、複数台の空間光信号受信部と、前記無線信号送信部
と前記空間光信号受信部とを接続したデータ処理部より
なり、前記端末送受信装置は１台の空間光信号送信部
と、１台の無線信号受信部と、前記空間光信号送信部と
前記無線信号受信部とを接続したデータ処理部よりな
り、集中局から端末へのデータ送信は無線信号を用い、
端末から集中局へは空間光信号を用い、かつ端末から集
中局へは同時に複数端末からのデータ送信を行うように
したことを特徴とする無線データ伝送用送受信装置。1. A communication system for performing wireless data transmission between one central station transmitting / receiving device and a plurality of terminal transmitting / receiving devices, wherein the central station transmitting / receiving device comprises one wireless signal transmitting section and a plurality of terminal transmitting / receiving devices. The spatial light signal receiving unit, a data processing unit connecting the wireless signal transmitting unit and the spatial light signal receiving unit, and the terminal transmitting / receiving device includes one spatial optical signal transmitting unit and one wireless signal. A receiving unit, which comprises a data processing unit connecting the spatial light signal transmitting unit and the wireless signal receiving unit, wherein a wireless signal is used for data transmission from the central station to the terminal,
A transmitter / receiver for wireless data transmission, wherein a spatial optical signal is used from a terminal to a central station, and data is simultaneously transmitted from a plurality of terminals to the central station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11118093A JP2500437B2 (en) | 1993-04-15 | 1993-04-15 | Transmitter / receiver for wireless data transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11118093A JP2500437B2 (en) | 1993-04-15 | 1993-04-15 | Transmitter / receiver for wireless data transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06303238A true JPH06303238A (en) | 1994-10-28 |
| JP2500437B2 JP2500437B2 (en) | 1996-05-29 |
Family
ID=14554526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11118093A Expired - Lifetime JP2500437B2 (en) | 1993-04-15 | 1993-04-15 | Transmitter / receiver for wireless data transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2500437B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009200974A (en) * | 2008-02-22 | 2009-09-03 | Kanto Auto Works Ltd | Wireless communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01278134A (en) * | 1988-04-30 | 1989-11-08 | Oki Electric Ind Co Ltd | Data communication system applying combination of infrared ray and radio wave |
| JPH01292916A (en) * | 1988-05-19 | 1989-11-27 | Honda Denshi Giken:Kk | Polling system to moving body |
-
1993
- 1993-04-15 JP JP11118093A patent/JP2500437B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01278134A (en) * | 1988-04-30 | 1989-11-08 | Oki Electric Ind Co Ltd | Data communication system applying combination of infrared ray and radio wave |
| JPH01292916A (en) * | 1988-05-19 | 1989-11-27 | Honda Denshi Giken:Kk | Polling system to moving body |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009200974A (en) * | 2008-02-22 | 2009-09-03 | Kanto Auto Works Ltd | Wireless communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2500437B2 (en) | 1996-05-29 |
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