JPH04127399A - Radio communication system - Google Patents
Radio communication systemInfo
- Publication number
- JPH04127399A JPH04127399A JP2247420A JP24742090A JPH04127399A JP H04127399 A JPH04127399 A JP H04127399A JP 2247420 A JP2247420 A JP 2247420A JP 24742090 A JP24742090 A JP 24742090A JP H04127399 A JPH04127399 A JP H04127399A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmitting device
- transmission power
- alarm
- train
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 238000013459 approach Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 12
- 238000012423 maintenance Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、線路に沿って設置され、列車通過信号を送信
する複数の信号発信装置と、工事現場におかれ、前記列
車通過信号を受信して警報を発する警報発信装置間の無
線通信方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention comprises a plurality of signal transmitting devices installed along railroad tracks to transmit train passing signals, and a signal transmitting device installed at a construction site to receive the train passing signals. This invention relates to a wireless communication system between alarm transmitting devices that issue alarms.
（従来の技術）
従来、列車運行時間帯における保線工事の際には、見張
人が列車の接近を目視により確認して作業者に危険を知
らせていた。あるいは、見張人が近接の駅と連絡をとり
合いながら列車の接近を確認し、作業者に危険を知らせ
ていた。しかし、人手により列車の接近を確認している
ため、ときには見落しが発生して警報を出すのが遅れて
しまい作業者に重大な危険を招くことがあった。(Prior Art) Conventionally, during track maintenance work during train operating hours, a watchman visually confirmed the approach of a train and alerted workers to the danger. Alternatively, watchmen communicated with nearby stations to confirm the approach of trains and alert workers of danger. However, since the approach of trains is checked manually, sometimes oversights occur and warnings are delayed, resulting in serious danger to workers.
このような問題を解決する一方法として、レールに沿っ
て設置された各信号機に、列車が通過するとき該信号機
から出力される通過検知信号にアドレスを付加しこれを
列車通過信号として無線で送信する信号発信装置を取り
付け、保線工事現場の警報発信装置により前記列車通過
信号を受信して作業者に列車の接近を知らせる方法が考
えられる。One way to solve this problem is to add an address to the passage detection signal output from each signal installed along the rail when a train passes, and send this wirelessly as a train passage signal. One possible method is to install a signal transmitting device to notify workers of the approaching train by receiving the train passing signal using an alarm transmitting device at the track maintenance work site.
この場合、警報発信装置は、列車の接近を知らせるには
保線工事の現場から一定範囲にある信号発信装置から上
記の列車通過信号を受信できればよく、その信号発信装
置と通信が可能であれば足りる。しかし、この一定範囲
は、作業者の退避に要する時間が作業内容によって変わ
ってくることから、その作業内容にも依存する。従って
、警報発信装置は、種々の作業を考慮し、最も広い範囲
をカバーできるようにその送信電力を決める必要がある
。また、電波の伝搬は場所によって異なる場合もあるの
で、最悪の場合を考慮して送信電力を大きく決める必要
がある。In this case, the warning transmitter needs only to be able to receive the above-mentioned train passing signal from a signal transmitter located within a certain range from the track maintenance work site in order to notify the approaching train, and it is sufficient if it can communicate with the signal transmitter. . However, this fixed range also depends on the content of the work since the time required for the worker to evacuate varies depending on the content of the work. Therefore, it is necessary for the alarm transmitting device to consider various tasks and determine its transmission power so as to cover the widest range. Furthermore, since the propagation of radio waves may vary depending on the location, it is necessary to determine the transmission power by considering the worst case scenario.
（発明が解決しようとする課題）
しかしながら、上記システムでは必要とする通信範囲が
狭い場合でも警報発信装置は一定の送信電力で送信を行
うため、通信が行われない範囲にも電波が到達し、同一
周波数を使用する他の警報発信装置を利用できる保線工
事の現場がそれだけ制限されるという問題点がある。(Problem to be Solved by the Invention) However, in the above system, even if the required communication range is narrow, the alarm transmitting device transmits with a constant transmission power, so radio waves may reach areas where communication is not possible. There is a problem in that the number of track maintenance work sites where other alarm transmitting devices that use the same frequency can be used is limited.
また、送信電力が大きければそれだけ消費電力は大きく
なり、従って運用可能時間が短くなり、電池の充電や交
換の頻度が高くなって保守上好ましくないという問題点
もある。Additionally, the larger the transmission power, the greater the power consumption, which shortens the available operating time, and increases the frequency of battery charging and replacement, which is undesirable in terms of maintenance.
そこで、本発明は警報発信装置の送信電力を必要とする
通信範囲の広さに応して制御することにより電波のを効
利用を図り、また消費電力の低減を図ることのできる無
線通信方式を提供することを目的とする。Therefore, the present invention proposes a wireless communication method that can make effective use of radio waves and reduce power consumption by controlling the transmission power of an alarm transmitting device according to the width of the required communication range. The purpose is to provide.
（課題を解決するための手段）
本発明は上記目的を達成するため、所定の間隔で設置さ
れた複数の信号発信装置と携帯用の警報発信装置との間
で無線で通信を行う無線通信方式において、警報発信装
置は送信電力を徐々に増大しながら初期信号を送信し、
所定の信号発信装置から応答信号を受信したとき送信電
力の増大を停止し、以後その送信電力で前記所定の信号
発信装置と通信を行うものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a wireless communication method for wirelessly communicating between a plurality of signal transmitting devices installed at predetermined intervals and a portable alarm transmitting device. , the alarm transmitting device transmits an initial signal while gradually increasing the transmission power,
When a response signal is received from a predetermined signal transmitting device, the increase in transmission power is stopped, and thereafter communication with the predetermined signal transmitting device is performed using that transmitting power.
（作 用）
作業現場における警報発信装置は信号発信装置に初期信
号を送信し、この初期信号を受信した信号発信装置は警
報発信装置ムこ応答信号を送信する。(Function) The alarm transmitter at the work site transmits an initial signal to the signal transmitter, and the signal transmitter that receives this initial signal transmits a response signal to the alarm transmitter.
そして、前記初期信号を送信する送信電力を徐々に増大
していくと、それに従って電波の到達範囲が拡大し、よ
り遠くにある信号発信装置から応答信号が返ってくる。Then, when the transmission power for transmitting the initial signal is gradually increased, the reach range of the radio waves is expanded accordingly, and a response signal is returned from a signal transmitting device located further away.
警報発信装置は応答信号内のアドレス情報から信号発信
装置を区別し、指定された監視範囲にあるすべての信号
発信装置から応答信号を受信したとき送信電力の増大を
停止し、以後その送信電力で前記監視範囲内の信号発信
装置と通信を行う。これにより、警報発信装置は通信可
能な最小限の送信電力で通信を行うことができる。The alarm transmitter distinguishes the signal transmitter from the address information in the response signal, stops increasing the transmission power when it receives response signals from all the signal transmitters within the specified monitoring range, and thereafter uses that transmit power. Communication is performed with a signal transmitting device within the monitoring range. Thereby, the alarm transmitting device can communicate with the minimum possible transmission power.
（実施例）
第１図は本発明の実施例を示す構成図であって、１は保
線工事現場で監督者等が携帯する警報発信装置、２ａ、
２ｂ、・・・、２ｆはレールに沿って所定間隔で設置さ
れている信号機、３ａ、３ｂ、・・・３ｆは信号機２ａ
、２ｂ ・・・、２ｆにそれぞれ取付けられている信
号発信装置である。ここで、信号機２ａ、２ｂ、・・・
、２ｆは列車が接近・通過するときに通過検知信号を出
力するものであり、信号発信装置３ａ、３ｂ、・・・、
３ｆはこの通過検知信号に自己のアドレスを付加し、こ
れを列車通過信号として電波で送信するものであり、警
報発信装置ｌはこの列車通過信号を受信して作業者に列
車接近を知らせる警報信号を送信するものである。(Embodiment) FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which 1 is an alarm transmitting device carried by a supervisor or the like at a track maintenance work site, 2a,
2b, . . . , 2f are traffic lights installed at predetermined intervals along the rail, 3a, 3b, . . . 3f are traffic lights 2a.
, 2b..., 2f are signal transmitting devices respectively attached. Here, traffic lights 2a, 2b,...
, 2f outputs a passing detection signal when a train approaches or passes, and signal transmitting devices 3a, 3b, . . .
3f adds its own address to this passing detection signal and transmits it by radio wave as a train passing signal, and the alarm transmitting device l receives this train passing signal and generates an alarm signal to notify the operator of the approaching train. is to be sent.
次に、本実施例の動作を第１図に基づいて説明する。Next, the operation of this embodiment will be explained based on FIG.
上述の列車接近を知らせる警報は、作業者が安全に退避
できるように列車が作業現場を通過する時刻より一定時
間前に発することが必要であるが、そのためには列車の
速度等を考慮し、作業現場から一定距離内に設置されて
いる各信号発信装置から列車ｉＩ！過信号を受信する必
要がある。The above-mentioned warning to notify of approaching trains needs to be issued a certain amount of time before the train passes the work site so that workers can safely evacuate. Train i! from each signal transmitting device installed within a certain distance from the work site! It is necessary to receive excessive signals.
作業現場の監督者はこれらの点を考慮して監視範囲を決
定し、その距離を第１図の警報発信装置ｌに入力する。The supervisor at the work site determines the monitoring range by taking these points into consideration, and inputs this distance into the alarm transmitting device 1 shown in FIG.
なお、監視すべき信号発信装置自体を特定し、そのアド
レスを警報発信装置ｌに入力してもよいが、この場合は
以下に述べる距離の算出は不要であり、信号発信装置の
同一性を判断すればよい。Note that it is also possible to specify the signal transmitting device itself to be monitored and input its address to the alarm transmitting device, but in this case, the distance calculation described below is not necessary, and the identity of the signal transmitting device can be determined. do it.
まず、警報発信装置１は自己のアドレス、工事対象の線
区アドレス等を含む初期信号を所定の送倍電力で送信す
る。この所定の送信電力としては、例えば送信した電波
が信号機設置一区間の距離を伝搬できる程度のものとす
る。警報信号装置ｌが第１図に示すように信号発信装置
３ｃ、３ｄの間に在るときは、信号発信装置３ｃ、３ｄ
のみがその初期信号を受信することがでる。信号発信装
置３ｃ、３ｄは初期信号に含まれる線区アドレスを調べ
、自己が属する線区と一致するときは自己の状態を初期
化するとともに、自己のアドレス、基点からのキロ程、
上記警報発信装置１のアドレス等を含む応答信号を警報
発信装置１に送信する。First, the alarm transmitting device 1 transmits an initial signal including its own address, the address of the line section to be constructed, etc., at a predetermined multiplied power. The predetermined transmission power is, for example, such that the transmitted radio waves can propagate the distance of one section where the traffic light is installed. When the alarm signal device l is located between the signal transmitters 3c and 3d as shown in FIG.
only those who can receive the initial signal. The signal transmitting devices 3c and 3d check the line section address included in the initial signal, and if it matches the line section to which they belong, initialize their own state, and also record their own address, the distance from the base point,
A response signal including the address of the alarm transmitting device 1, etc. is transmitted to the alarm transmitting device 1.
警報発信装置１は上記応答信号を受信すると、その応答
信号に含まれる信号発信装置のキロ程を抽出し、これを
用いて作業現場との間の距離を算出する。そして、その
うち最も遠い距離が先に入力された監視範囲の距離より
大きいか否かを調べる。When the alarm transmitting device 1 receives the response signal, it extracts the kilometer distance of the signal transmitting device included in the response signal, and uses this to calculate the distance to the work site. Then, it is checked whether the farthest distance is greater than the previously input monitoring range distance.
なお、作業現場の基点からのキロ程ばあらかしめ警報発
信装置１に入力されているものとする。監視範囲の距離
より小さい場合は、監視範囲がカバーされていないとし
て、前記所定の送信電力より一定量だけ大きい送信電力
で上記初期信号を再送信する。これにより、送信した電
波の到達範囲は一定距離だけ拡大する。例えば、上記再
度の送信により、さらに信号発信装置３ｂと３０とが初
期信号を受信できることとなったとき、信号発信装置３
ｂと３ｅは信号発信装置３ｃ、３ｄの場合と同様にして
応答信号を送信する。It is assumed that the approximate distance of kilometers from the starting point of the work site has been inputted to the alarm transmitting device 1. If the distance is smaller than the monitoring range, it is determined that the monitoring range is not covered, and the initial signal is retransmitted with a transmission power that is a certain amount larger than the predetermined transmission power. This expands the reach of the transmitted radio waves by a certain distance. For example, when the signal transmitting devices 3b and 30 are able to further receive the initial signal due to the above-mentioned retransmission, the signal transmitting device 3
b and 3e transmit response signals in the same manner as signal transmitters 3c and 3d.
警報発信装置１は上記応答信号を受信し、信号発信装置
３ｂ、３ｅと作業現場との間の距離を算出し、必要とす
る監視範囲がカバーできたか否かを調べる。そして、必
要とする監視範囲をカッ＼−できるまで、送信電力を一
定量増大しながら初期信号を送信する。必要とする監視
範囲を力／Ｎ−できたとき、初期信号の送信を止め、以
後その時点の送信電力で信号発信装置と通信する。これ
により、最小限の送信電力で所定の信号発信装置と通信
することとなり、必要以上に電波が拡がるのを回避する
ことができる。The alarm transmitter 1 receives the response signal, calculates the distance between the signal transmitter 3b, 3e and the work site, and checks whether the required monitoring range has been covered. Then, the initial signal is transmitted while increasing the transmission power by a certain amount until the required monitoring range is achieved. When the required monitoring range has been achieved, transmission of the initial signal is stopped, and thereafter communication with the signal transmitting device is performed using the transmission power at that time. Thereby, communication with a predetermined signal transmitting device is performed using the minimum transmission power, and it is possible to avoid spreading the radio waves more than necessary.
一方、警報発信装置１は、応答信号を送信してきた信号
発信装置と作業現場との距離を表示する。On the other hand, the alarm transmitting device 1 displays the distance between the signal transmitting device that has transmitted the response signal and the work site.
作業の監督者はその表示に基づいて監視範囲を確認し、
監視対象とする信号発信装置、例えば３ｂ〜３ｅを警報
発信装置１に指示する。警報発信装置１は指示された信
号発信装置のアドレスを含む確認信号を、順次送信する
。The work supervisor confirms the monitoring range based on the display, and
The alarm transmitting device 1 is instructed to signal transmitting devices to be monitored, for example, 3b to 3e. The alarm transmitting device 1 sequentially transmits confirmation signals containing the addresses of the designated signal transmitting devices.
上記確認信号を受信した信号発信装置３ｂ〜３ｅは以後
監視モードに入り、列車が接近、通過したとき列車通過
信号を警報発信装置１に送信する。After receiving the confirmation signal, the signal transmitting devices 3b to 3e enter the monitoring mode and transmit a train passing signal to the warning transmitting device 1 when a train approaches or passes.
警報発信装置１は上記列車通過信号を受信し、確認信号
を信号発信装置に送信するとともに、所定の警報信号を
作業者に送信する。The warning transmitting device 1 receives the train passing signal, transmits a confirmation signal to the signal transmitting device, and transmits a predetermined warning signal to the operator.
第２図は警報発信装置１の送信出力を制御する送信出力
制御部のブロック図である。同図において、４は端子８
から入力される送信信号を増幅して端子９から出力する
電力増幅部、５は電力増幅部４の出力を検波する検波器
、６は送信電力を決める基準電圧を発生する基準電圧発
生器、７は検波器５からの検波出力と前記基準電圧との
差を求め電力増幅器４に出力する比較器であり、電力増
幅器４は比較器７の出力に基づいて、その比較器７の出
力レヘルが小さくなる方向に利得を変えるものである。FIG. 2 is a block diagram of a transmission output control section that controls the transmission output of the alarm transmitting device 1. As shown in FIG. In the same figure, 4 is the terminal 8
5 is a detector that detects the output of the power amplification section 4; 6 is a reference voltage generator that generates a reference voltage that determines the transmission power; 7; is a comparator that calculates the difference between the detection output from the detector 5 and the reference voltage and outputs it to the power amplifier 4. This changes the gain in the direction of
従って、電力増幅器４の出力は、基準電圧発生器６０基
準電圧を外部から制御することにより変えることができ
る。Therefore, the output of the power amplifier 4 can be changed by controlling the reference voltage of the reference voltage generator 60 from the outside.
（発明の効果）
以上、詳細に説明したように本発明によれば、警報発信
装置は監視範囲内の所定の信号発信装置と最小限の送信
電力で通信を行うことができるので、必要以上に送信電
波が拡がることがなく、同一周波数を使用する他警報発
信装置を利用できる他の保線工事の現場の範囲が拡がる
。(Effects of the Invention) As described in detail above, according to the present invention, the alarm transmitting device can communicate with a predetermined signal transmitting device within the monitoring range with the minimum transmission power, so Since the transmitted radio waves do not spread, the range of other track maintenance work sites where other alarm transmitting devices using the same frequency can be used is expanded.
また、警報発信装置の消費電力を低減することが可能と
なり、電源の有効利用を図ることができる。Furthermore, it is possible to reduce the power consumption of the alarm transmitting device, and it is possible to effectively utilize the power source.
第１図は本発明の実施例を示す構成図、第２図は信号発
信装置の送信出力制御部のブロック図である。
■・・・警報発信装置、２ａ〜２ｆ・・・信号機、３ａ
〜３
ｆ・・・信号発信装置、
４・・・電力増幅部、
５・・・検
波器、
６・・・基準電圧発生器、
７・・・比較器。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a transmission output control section of a signal transmitting device. ■...Alarm transmitter, 2a-2f...Traffic light, 3a
~3 f... Signal transmitter, 4... Power amplification section, 5... Detector, 6... Reference voltage generator, 7... Comparator.
Claims (1)
警報発信装置との間で無線で通信を行う無線通信方式に
おいて、 警報発信装置は送信電力を除々に増大しながら初期信号
を送信し、所定の信号発信装置から応答信号を受信した
とき送信電力の増大を停止し、以後その送信電力で前記
所定の信号発信装置と通信を行うことを特徴とする無線
通信方式。[Claims] In a wireless communication system that wirelessly communicates between a plurality of signal transmitting devices installed at predetermined intervals and a portable alarm transmitting device, the warning transmitting device gradually increases its transmission power. a wireless communication system characterized by transmitting an initial signal while transmitting an initial signal, stopping an increase in transmission power when a response signal is received from a predetermined signal transmitting device, and thereafter communicating with the predetermined signal transmitting device using that transmit power. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2247420A JPH04127399A (en) | 1990-09-19 | 1990-09-19 | Radio communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2247420A JPH04127399A (en) | 1990-09-19 | 1990-09-19 | Radio communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04127399A true JPH04127399A (en) | 1992-04-28 |
Family
ID=17163175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2247420A Pending JPH04127399A (en) | 1990-09-19 | 1990-09-19 | Radio communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04127399A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009534991A (en) * | 2006-04-24 | 2009-09-24 | マーベル ワールド トレード リミテッド | Improved 802.11 mesh architecture |
| JP2014176031A (en) * | 2013-03-12 | 2014-09-22 | Nippon Telegr & Teleph Corp <Ntt> | Radio access point device and power control method |
-
1990
- 1990-09-19 JP JP2247420A patent/JPH04127399A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009534991A (en) * | 2006-04-24 | 2009-09-24 | マーベル ワールド トレード リミテッド | Improved 802.11 mesh architecture |
| US8738013B2 (en) | 2006-04-24 | 2014-05-27 | Marvell World Trade Ltd. | 802.11 mesh architecture |
| US9479428B2 (en) | 2006-04-24 | 2016-10-25 | Marvell World Trade Ltd. | Cumulative route metrics for wireless mesh network routing |
| JP2014176031A (en) * | 2013-03-12 | 2014-09-22 | Nippon Telegr & Teleph Corp <Ntt> | Radio access point device and power control method |
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