JPS6130780B2 - - Google Patents
Info
- Publication number
- JPS6130780B2 JPS6130780B2 JP54132342A JP13234279A JPS6130780B2 JP S6130780 B2 JPS6130780 B2 JP S6130780B2 JP 54132342 A JP54132342 A JP 54132342A JP 13234279 A JP13234279 A JP 13234279A JP S6130780 B2 JPS6130780 B2 JP S6130780B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- signal
- mobile
- communication
- header signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】
本発明は単一の誘導用周波数により複数の移動
体と路測に設置された路上機器間で誘導通信を行
う路上・移動体間通信方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a road-to-mobile communication system that performs guided communication between a plurality of moving bodies and on-road equipment installed at a road survey using a single guiding frequency.
一波の（単一の）誘導用周波数を用いて、移動
体と路上機器間で誘導通信を行うための通信手順
を第１図〜第３図に示す従来例より、説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS A communication procedure for performing guidance communication between a mobile object and roadside equipment using one wave (single) guidance frequency will be explained based on a conventional example shown in FIGS. 1 to 3.
第１図、第２図は、誘導通信の交信エリア、第
３図は、その交信手順を示したものである。通常
路上に設置された路上機では、路上機ヘツダ信号
４をToの間隔で第１図、第２図の交信エリア１
を形成する電界強度になるように送出している。
第１図に示す交信エリア１内に、移動体２が侵入
すると、路上機のヘツダー信号４のh1を受信後、
第３図ロに示すタイミングで、移動体２は送信５
を行う。またこのタイミングでは、移動体３は路
上機ヘツダー信号４を受信していないため移動体
３は送信６を行わない。 1 and 2 show the communication area of guided communication, and FIG. 3 shows the communication procedure. Normally, in a roadside unit installed on the road, the roadside unit header signal 4 is sent to the communication area 1 in Figures 1 and 2 at intervals of To.
It is sent out so that the electric field strength forms.
When a mobile object 2 enters the communication area 1 shown in FIG.
At the timing shown in FIG.
I do. Furthermore, at this timing, the mobile body 3 does not perform the transmission 6 because it has not received the road machine header signal 4.
なお、送受とも同一周波数で交信を行うため、
路上機では移動体からの送信信号を受信すると、
移動体からの送信が完了するまで、路上機ヘツダ
信号４の送信は停止する。次に路上機ヘツダ信号
４はh2のタイミングで、第２図に示した様に、移
動体２、移動体３が同一の交信エリア１内に存在
すると、第３図ロ，ハのようにh2のタイミング終
了後、移動体２の送信５と移動体３の送信６が同
時に行われるため、混信が発生する。このため、
第１図、第２図に示した様なタイミングで移動体
２、移動体３が交信エリアに侵入すると、移動体
２からの信号は路上機に正常に伝送されない確率
が高くなる。 In addition, since communication is performed on the same frequency for both transmission and reception,
When a roadside device receives a transmission signal from a moving object,
The transmission of the roadside machine header signal 4 is stopped until the transmission from the mobile body is completed. Next, the roadside machine header signal 4 is transmitted at the timing h2 , and as shown in FIG. After the timing of h2 ends, the transmission 5 of the mobile body 2 and the transmission 6 of the mobile body 3 are performed simultaneously, so that interference occurs. For this reason,
When the mobile objects 2 and 3 enter the communication area at the timing shown in FIGS. 1 and 2, there is a high probability that the signal from the mobile object 2 will not be transmitted normally to the roadside device.
なお別の従来例では、移動体と路上機間で１度
交信が行なわれると、移動体の送信を停止する方
式もあるが、路上機からの受信完了信号が必要に
なるため、機能が複雑になる。また路上機から受
信完了信号を受信しない方式の場合は、複数個の
交信が不可能になる。 Another conventional method is to stop the mobile object from transmitting once communication has been established between the mobile object and the roadside device, but this method is complicated because it requires a reception completion signal from the roadside device. become. Furthermore, in the case of a method in which a reception completion signal is not received from a roadside device, multiple communications are impossible.
本発明は上記の問題を解決したもので、同一エ
リアに存在する移動体が、第１図、第２図に示し
た順序で侵入する場合には、２台までの移動体は
交互に交信を行うことが可能になると共に、３台
以上の移動体が存在した場合でも、別途方式を付
加することにより、混信の確率を低下させるよう
にしたものである。以下この詳細について述べ
る。 The present invention solves the above problem, and when moving objects existing in the same area invade in the order shown in Figs. 1 and 2, up to two moving objects can communicate alternately. In addition, even if there are three or more moving objects, by adding a separate method, the probability of interference is reduced. The details will be described below.
まず、路上機ヘツダ信号の検出条件として、キ
ヤリアが設定長以上連続することを特徴としてい
るため、第４図に示すように、交信エリア内に先
に到達した移動体２がヘツダ信号７のキヤリアを
移動体３より早く受信するため、移動体３より早
く送信８を送出する。移動体３では受信エリア１
内に到達していないので、ヘツダ信号７を受信で
きないものの、送信８の終了をヘツダ信号７の終
了とみなしている。そして移動体３は送信８の終
了検出後、送信９を送信する。すなわち、第２図
に示したような交信エリア１において２台の移動
体２，３が、同一交信エリア１に入る場合は、そ
の移動体２，３間でも、通信が可能になるよう通
信方式を設定しているので、移動体３で送信８を
受信し、キヤリア長の連続でヘツダ信号を識別す
ることにより、ヘツダ信号７として処理する。ま
た、移動体２は、移動体２の送信８の直後から、
受信体制に入り、移動体３の送信９を信号７とみ
なし、移動体３の送信９完了後、移動体２の送信
８を行う。この間、路上機では、交互に、移動体
２、移動体３からの信号を受信するため、路上機
ヘツダ信号７の送信は停止する。 First, since the detection condition for the road vehicle header signal is that the carriers are continuous for a set length or longer, as shown in FIG. In order to receive this earlier than the mobile unit 3, the transmission 8 is sent out earlier than the mobile unit 3. Reception area 1 for mobile unit 3
Although the header signal 7 cannot be received because the header signal 7 has not reached the end of the header signal 7, the end of the transmission 8 is regarded as the end of the header signal 7. After detecting the end of transmission 8, mobile body 3 transmits transmission 9. In other words, when two mobile units 2 and 3 enter the same communication area 1 in the communication area 1 as shown in FIG. is set, the mobile unit 3 receives the transmission 8 and processes it as the header signal 7 by identifying the header signal based on the continuity of the carrier length. Further, the mobile body 2 immediately after the transmission 8 of the mobile body 2,
The receiving system is entered, the transmission 9 of the mobile body 3 is regarded as the signal 7, and after the transmission 9 of the mobile body 3 is completed, the transmission 8 of the mobile body 2 is performed. During this time, the roadside machine alternately receives signals from the moving bodies 2 and 3, and therefore stops transmitting the roadside machine header signal 7.
この構成において交信エリア間に移動体２が１
台の場合は、第５図に示すように移動体２では、
路上機ヘツダ信号１０のみ受信するため、移動体
２では、ヘツダ信号受信後常に、移動体２の送信
１１を行う。次に２台以上交信エリアに移動体が
存在すると第６図に示すように、移動体では路上
機ヘツダ信号１２により移動体送信を行つた場合
以外は、移動体送信を行つた後、Teの期間ヘツ
ダ信号受信を停止することにより、複数の移動体
から同時に送信が行われ混信が発生する確率を低
くしている。 In this configuration, there is one mobile object 2 between the communication areas.
In the case of a stand, as shown in FIG.
Since only the road machine header signal 10 is received, the moving body 2 always performs the transmission 11 after receiving the header signal. Next, if there are two or more moving objects in the communication area, as shown in FIG. By stopping header signal reception for a period of time, the probability that multiple mobile units transmit simultaneously and cause interference is reduced.
第７図は路上機の動作フローチヤート、第８図
は移動体の動作フローチヤートを示したもので、
第８図におけるa1，a2が付加機能になつている。 Figure 7 shows the operation flowchart of the roadside machine, and Figure 8 shows the operation flowchart of the mobile unit.
A 1 and a 2 in Fig. 8 are additional functions.
なお、交信エリア１内に２台以上の移動体が存
在している場合、その中の一台が交信エリア１か
ら出て行つた場合には、その移動体はもはや路上
機へは送信しない。しかし、２台以上の移動体
中、最も早く受信エリア１から出て行くというこ
とは、第１図、第６図ロのように最も早く交信エ
リア１内に進入してきているので、その移動体と
路上機との交信は１回は終了していることとな
る。そして、早く交信エリア１内に進入してきた
順序に、路上機と一回は交信する。 Note that if there are two or more mobile units within the communication area 1 and one of them leaves the communication area 1, that mobile unit will no longer transmit data to the roadside unit. However, out of two or more moving objects, the earliest to leave reception area 1 means that the moving object has entered communication area 1 earliest, as shown in Figures 1 and 6 (b). This means that communication with the roadside device has been completed at least once. Then, the devices communicate with the roadside devices at least once in the order in which they entered the communication area 1 first.
本発明は上記実施例から明らかなように、路上
機では、一定間隔で送信可能を示すヘツダ信号を
発信しておき、交信エリアに進入した移動体から
送信信号を受信中は、ヘツダ信号を送信するよう
にし、一方移動体ではヘツダ信号の終了と他の移
動体から送信された送信信号の終了のいずれでも
信号を送信させ、しかも、送信終了後は一定時
間、ヘツダ信号受信停止期間を設けているので、
移動体同士の混信はきわめて少なくなり、しかも
ヘツダ信号が途中停止している分、交信時間が短
縮できるという効果を有する。 As is clear from the above embodiments, the present invention transmits a header signal indicating that transmission is possible at regular intervals, and transmits the header signal while receiving a transmission signal from a moving object that has entered the communication area. On the other hand, the mobile unit transmits a signal at both the end of the header signal and the end of the transmission signal sent from another mobile unit, and also provides a period in which header signal reception is stopped for a certain period of time after the end of transmission. Because there are
Interference between moving bodies is extremely reduced, and since the header signal is stopped midway, communication time can be shortened.
第１図、第２図は移動体と路上機の交信エリア
の関係図、第３図は従来の通信方式の交信手順を
示す図、第４図、第５図、第６図は本発明の一実
施例における路上・地上間通信方式における交信
手順を示す図、第７図、第８図は路上機移動体の
動作フローチヤートである。
Figures 1 and 2 are relationship diagrams of communication areas between mobile objects and roadside devices, Figure 3 is a diagram showing the communication procedure of the conventional communication method, and Figures 4, 5, and 6 are diagrams of the communication area of the present invention. FIGS. 7 and 8, which are diagrams showing the communication procedure in the road-to-ground communication system in one embodiment, are operational flowcharts of the road-side mobile object.
Claims (1)
信号を発信しておき、交信エリアに進入した移動
体から送信信号を受信中はヘツダ信号を送信する
ようにし、移動体ではヘツダ信号の終了と他の移
動体から送信された送信信号の終了のいずれでも
信号を送信させ、送信終了後は一定時間ヘツダ信
号受信停止期間を設けたことを特徴とする路上・
移動体間通信方式。1 The roadside device transmits a header signal indicating that transmission is possible at regular intervals, and transmits the header signal while receiving a transmission signal from a mobile object that has entered the communication area. The on-road vehicle is characterized in that the signal is transmitted at any time when a transmission signal transmitted from a mobile object ends, and a header signal reception stop period is provided for a certain period of time after the transmission ends.
Mobile communication method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13234279A JPS5656048A (en) | 1979-10-12 | 1979-10-12 | Communication system between road and traveling body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13234279A JPS5656048A (en) | 1979-10-12 | 1979-10-12 | Communication system between road and traveling body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5656048A JPS5656048A (en) | 1981-05-16 |
| JPS6130780B2 true JPS6130780B2 (en) | 1986-07-16 |
Family
ID=15079088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13234279A Granted JPS5656048A (en) | 1979-10-12 | 1979-10-12 | Communication system between road and traveling body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5656048A (en) |
-
1979
- 1979-10-12 JP JP13234279A patent/JPS5656048A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5656048A (en) | 1981-05-16 |
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