JPH0537644A - System for detecting collision of outgoing call - Google Patents
System for detecting collision of outgoing callInfo
- Publication number
- JPH0537644A JPH0537644A JP3187247A JP18724791A JPH0537644A JP H0537644 A JPH0537644 A JP H0537644A JP 3187247 A JP3187247 A JP 3187247A JP 18724791 A JP18724791 A JP 18724791A JP H0537644 A JPH0537644 A JP H0537644A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- signal
- mobile station
- identification signal
- exchange
- 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 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 5
- 108010076504 Protein Sorting Signals Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ランダムアクセス通信
における発信衝突検出方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission collision detection method in random access communication.
【０００２】[0002]
【従来の技術】従来、ランダムアクセス通信の一例であ
る自動車電話システムでは、電子情報通信学会刊「自動
車電話」第５章（第１０４頁〜第１０６頁）に記載のよ
うに接続制御チャネルに複数の周波数を割当て、端末が
制御信号を互いに異なる周波数を用いて送出する。そし
て、同時に複数の端末が発信したとき、異なる周波数間
で互いに干渉し合い、基地局にて複数の周波数を同時に
受信できないことで衝突を知り、それを端末に対する制
御信号を用いて発信端末に知らせる。発信端末では、こ
の信号により他の端末と衝突したことを知り、再送の動
作に入る。2. Description of the Related Art Conventionally, in a car telephone system which is an example of random access communication, a plurality of connection control channels are provided in a connection control channel as described in Chapter 5 (pages 104 to 106) of "Car Phone" published by The Institute of Electronics, Information and Communication Engineers. , And the terminal sends control signals using different frequencies. Then, when a plurality of terminals transmit at the same time, they interfere with each other between different frequencies and the base station cannot receive the plurality of frequencies at the same time to know the collision, and inform the originating terminal by using a control signal to the terminal. . The originating terminal learns from this signal that it has collided with another terminal, and starts a retransmission operation.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来技術の自
動車電話システムには、以下の問題があった。The above-mentioned conventional car telephone system has the following problems.
【０００４】(1) 衝突した端末は、１端末は受け付け可
能であるにもかかわらず、すべての端末が再送動作に入
る。(1) As for the collided terminals, all the terminals enter into the retransmission operation although one terminal can accept the collision.
【０００５】(2) 基地局に衝突検出論理が必要となり、
コスト高となる。(2) Collision detection logic is required in the base station,
High cost.
【０００６】(3) 衝突を確実に検出するためには、接続
制御チャネルに多数の周波数を割り当てる必要がある。
また、各端末にもこれらの多数の周波数を送出する機能
が必要となる。(3) In order to reliably detect a collision, it is necessary to allocate a large number of frequencies to the connection control channel.
In addition, each terminal is required to have a function of transmitting these many frequencies.
【０００７】本発明は、これら従来技術の問題点を解決
した列車，自動車等の移動体などのランダムアクセス通
信における発信衝突検出方式を提供することを目的とす
る。It is an object of the present invention to provide a transmission collision detection method in random access communication for moving bodies such as trains and automobiles, which solves the problems of the prior art.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明において、発信端末から交換機に端末識別信
号を送出し、交換機は一番レベルの高い信号のみを受信
し、正常に受信できた端末識別信号を再び端末側に返送
し、端末側で自分の端末識別信号と返送されてきた端末
識別信号を比較する構成とする。In order to achieve the above object, according to the present invention, a terminal identification signal is sent from a calling terminal to a switching device, and the switching device receives only the signal with the highest level and can receive normally. The terminal identification signal is returned to the terminal side again, and the terminal side compares its own terminal identification signal with the returned terminal identification signal.
【０００９】[0009]
【作用】この構成により、端末識別信号を端末から交換
機へ送出し、交換機にて受け付けた端末の識別信号を再
び端末側に返送する。これを端末が受信することによ
り、自分の接続要求が受け付けられたかどうか判定でき
る。すなわち、返送されてきた端末識別信号が自分の端
末識別信号と等しくなければ自分の接続要求が受け付け
られないと判断し、再送動作に入り、等しければ処理を
続行する。これによって、複数の端末が同時に発信した
場合、１つの端末のみを受け入れ、他の端末は再送動作
に入れるようになるので、発信衝突時の処理が効率よく
行え、かつ、サービス品質を向上させることができる。With this configuration, the terminal identification signal is sent from the terminal to the exchange, and the terminal identification signal accepted by the exchange is sent back to the terminal side. By receiving this, the terminal can determine whether or not its own connection request has been accepted. That is, if the returned terminal identification signal is not equal to its own terminal identification signal, it judges that its own connection request cannot be accepted, enters into the resending operation, and continues processing if equal. As a result, when multiple terminals make a call at the same time, only one terminal will be accepted and the other terminals will enter the retransmission operation, so that the processing at the time of a call collision can be performed efficiently and the quality of service can be improved. You can
【００１０】[0010]
【実施例】以下、上述した本発明の構成を移動体通信に
適用した一実施例を図１，図２，図３，図４，図５を用
いて説明する。図１は本発明の構成図を示す。図２は、
交換局と移動局間の正常な場合の信号シーケンスを示
す。図３は、移動局３および移動局３’が同一チャネル
を用いて同時に発信した場合の信号シーケンスを示す。
図４は、移動局における発信制御の流れ図を示す。図５
は、交換局における発信制御の流れ図を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the above-described configuration of the present invention is applied to mobile communication will be described below with reference to FIGS. 1, 2, 3, 4, and 5. FIG. 1 shows a block diagram of the present invention. Figure 2
The signal sequence in a normal case between a switching center and a mobile station is shown. FIG. 3 shows a signal sequence when the mobile station 3 and the mobile station 3'use the same channel to transmit at the same time.
FIG. 4 shows a flow chart of transmission control in the mobile station. Figure 5
FIG. 4 is a flow chart of transmission control in the exchange.
【００１１】さて、図１で交換局１は、信号送信器（Ｓ
ＮＤ）１Ｓと、信号受信器（ＲＥＣ）１Ｒと、中央処理
装置（ＰＲＳ）１Ｐと、メモリ（ＣＭＭ）１Ｍと、移動
局と、ネットワーク（ＮＭ）１Ｎと、トランク（ＴＲ
Ｋ）１Ｔと、無線のやりとりを行う基地局２より構成さ
れている。一方移動局３は、中央処理装置（ＰＲＳ）３
Ｐと、メモリ（ＭＭ）３Ｍと、ネットワーク（ＮＷ）３
Ｎと、トランク（ＴＲＫ）３Ｔと、信号送信器（ＳＮ
Ｄ）３Ｓと、信号受信器（ＲＥＣ）３Ｒと、ビジー音送
出器（ＢＴ）３Ｂにより構成され、識別番号ＩＤ０１２
３をもっている。移動局３’は中央処理装置（ＰＲＳ）
３Ｐ’と、メモリ（ＭＭ）３Ｍ’とネットワーク（Ｎ
Ｗ）３Ｎ’と、トランク（ＴＲＫ）３Ｔ’と、信号送信
器（ＳＷＤ）３’Ｓと、信号受信器（ＲＥＣ）３’Ｒ
と、ビジー音送出器（ＢＴ）３Ｂ’により構成され、識
別番号ＩＤ０１２３４をもっている。移動局は２つしか
図示していないが、多数存在して良いことはいうまでも
ない。Now, in FIG. 1, the exchange 1 has a signal transmitter (S
ND) 1S, signal receiver (REC) 1R, central processing unit (PRS) 1P, memory (CMM) 1M, mobile station, network (NM) 1N, trunk (TR)
K) 1T and a base station 2 that communicates wirelessly. On the other hand, the mobile station 3 has a central processing unit (PRS) 3
P, memory (MM) 3M, and network (NW) 3
N, trunk (TRK) 3T, and signal transmitter (SN
D) 3S, signal receiver (REC) 3R, busy tone transmitter (BT) 3B, and identification number ID012
I have 3. Mobile station 3'is a central processing unit (PRS)
3P ′, memory (MM) 3M ′ and network (N
W) 3N ', trunk (TRK) 3T', signal transmitter (SWD) 3'S, and signal receiver (REC) 3'R
And a busy tone transmitter (BT) 3B 'and has an identification number ID01234. Although only two mobile stations are shown, it goes without saying that a large number of mobile stations may exist.
【００１２】次に、この図１の実施例の構成と、図２，
図４，図５を用いて移動局３が発信を行う場合について
説明する。Next, the configuration of the embodiment shown in FIG.
A case where the mobile station 3 makes a call will be described with reference to FIGS.
【００１３】移動局３が発信を行う場合、中央処理装置
３Ｐに収納されている。図４にそのフローチャートを示
す。移動局発信制御プログラム４００により、チャネル
番号で初期設定（４０１）した後、該当チャネルに空信
号が有か否かを判定し（４０２）、空信号がない場合は
チャネル番号を更新し（４０９）、全チャネルがふさが
っていなければ再度空信号が有かの判断を行う。もし空
信号が有った場合には制御チャネルｉを起動するためト
ランク３ＴのＳＳ線をオンとする（４０３）。移動局３
からの起動をトランク１Ｔで受けた交換局１の中央処理
装置１Ｐに収納されている。図５にそのフローチャート
を示す。交換局発信制御プログラム（５００）は起動信
号を受信したことを移動局に知らせるために、空信号を
断とする為トランク１ＴのＳＳ線をオンとする（５０
２）。次に、移動局３の中央処理装置３Ｐに収容されて
いる移動局発信制御プログラム４００ではステップ４０
４でトランク３Ｔの空信号が無くなったことを検出した
場合、移動局３の識別番号ＩＤの１ケタめのＩＤ１
（０）、信号送信器３Ｓを使用して、交換局１に送出す
（４０５）。ＩＤ１（０）は、交換局１の信号受信器１
Ｒによって受信され（５０３）、交換局１の中央処理装
置１Ｐに収容された交換局発信制御プログラム５００に
より、信号送信器１Ｓを使用して、移動局３に返送され
る（５０４）。移動局３では信号受信器３Ｒにより、交
換局１から返送されて来たＩＤ１（０）を受信し、移動
局３の中央処理装置３Ｐに収容された移動局受信制御プ
ログラム４００により、送出したＩＤとの比較を行い
（４０７）、一致していた場合は図２に示すように順
次、２ケタめのＩＤ２（１），３ケタめのＩＤ３
（２），４ケタめのＩＤ４（３）と送受信を交換局１と
の間でくり返す（４１２，４１５）。When the mobile station 3 makes a call, it is stored in the central processing unit 3P. The flowchart is shown in FIG. The mobile station transmission control program 400 initializes the channel number (401) and then determines whether or not there is an empty signal on the corresponding channel (402). If there is no empty signal, the channel number is updated (409). If all channels are not occupied, it is judged again whether there is an empty signal. If there is an empty signal, the SS line of the trunk 3T is turned on to activate the control channel i (403). Mobile station 3
It is stored in the central processing unit 1P of the exchange 1 which receives the activation from the trunk 1T. The flowchart is shown in FIG. The switching center transmission control program (500) turns on the SS line of the trunk 1T in order to disconnect the empty signal in order to notify the mobile station that the activation signal has been received (50).
2). Next, in the mobile station transmission control program 400 accommodated in the central processing unit 3P of the mobile station 3, the step 40
When it is detected that the empty signal of the trunk 3T has disappeared in 4, the first digit of the identification number ID of the mobile station 3, ID1
(0), the signal transmitter 3S is used to send to the exchange 1 (405). ID1 (0) is the signal receiver 1 of the exchange 1.
It is received by R (503) and is returned to the mobile station 3 using the signal transmitter 1S by the exchange originating control program 500 contained in the central processing unit 1P of the exchange 1 (504). The mobile station 3 receives the ID1 (0) returned from the exchange 1 by the signal receiver 3R, and sends the ID sent by the mobile station reception control program 400 accommodated in the central processing unit 3P of the mobile station 3. (407), and if they match, as shown in FIG. 2, the second digit ID2 (1) and the third digit ID3 are sequentially displayed.
(2) The fourth digit ID 4 (3) and transmission / reception are repeated with the exchange 1 (412, 415).
【００１４】移動局３の中央処理装置３Ｐに収容された
移動局発信制御プログラム４００で全てのＩＤが送出さ
れた場合には、発信電番送出処理が実行（４１３）され
た後、制御チャネルの復旧を実行し（４１４）、処理を
終了する。交換局１の中央処理装置１Ｐに収容された交
換局発信制御プログラム５００では、ステップ５０５で
のチェックで全ＩＤを受信済の場合は発信電番受信処理
を実行し（５０６）、処理を終了する（５０７）。When all the IDs are transmitted by the mobile station transmission control program 400 accommodated in the central processing unit 3P of the mobile station 3, the transmission telephone number transmission processing is executed (413) and then the control channel of the control channel is changed. The recovery is executed (414), and the process ends. In the switching center transmission control program 500 accommodated in the central processing unit 1P of the switching center 1, if all the IDs have been received in the check in step 505, the transmission number receiving process is executed (506), and the process ends. (507).
【００１５】さて、次に図１の実施例の構成と図３，図
４，図５を用いて移動局３と移動局３’の同時発信の場
合について説明する。Next, the case of simultaneous transmission from the mobile station 3 and the mobile station 3'will be described with reference to the configuration of the embodiment shown in FIG. 1 and FIGS.
【００１６】移動局３と移動局３’が同時に発信した場
合、制御チャネルｉは共通であることにより、移動局３
の起動と移動局３’の起動が同時に交換局１にとどく。
起動を受けた交換局１は２つの移動局からの起動とはわ
からず、空信号を断とするためトラック１ＴのＳＳ線を
オンとする（５０２）。トランク３Ｔおよびトラック３
Ｔ’の空信号断を検出した移動局３および移動局３’
は、図３に示すようにそれぞれの識別番号ＩＤの１ケタ
めのＩＤ１（０）とＩＤ１’（０）を交換局１に対して
送出する（４０５）。順次２ケタめのＩＤ２（１）とＩ
Ｄ２’（１），３ケタめのＩＤ３（２）とＩＤ３’
（２），４ケタめのＩＤ４（３）とＩＤ４’（４）を送
出する。When the mobile station 3 and the mobile station 3'send simultaneously, the control channel i is common, so that the mobile station 3
And the mobile station 3'start up at the switching center 1 at the same time.
The exchange 1 which has received the activation does not know that it has been activated from the two mobile stations, and turns on the SS line of the track 1T to disconnect the empty signal (502). Trunk 3T and truck 3
Mobile station 3 and mobile station 3'that have detected an empty signal loss of T '
Sends the first digit ID1 (0) and ID1 '(0) of each identification number ID to the exchange 1 as shown in FIG. 3 (405). The second digit ID 2 (1) and I
D2 '(1), third digit ID3 (2) and ID3'
(2), 4th digit ID4 (3) and ID4 '(4) are transmitted.
【００１７】一方交換局１では、順次送られて来る識別
信号ＩＤを返送する（５０４）。この時、移動局３と移
動局３’から送られて来る信号にレベル差が存在した場
合、レベルの高い方の信号が信号受信器１Ｒに受信され
てしまう。本実施例は移動局３の信号が信号受信器に１
Ｒに受信された場合で４ケタめのＩＤ４（３）が移動局
３および移動局３’に返送される。ＩＤ４（３）を受信
した移動局３’の中央処理装置３Ｐ’に収容された移動
局発信制御プログラム４００では、ステップ４０７で送
出した識別信号ＩＤ４’（４）との不一致を検出し、復
旧の為トラック３Ｔ’のＳＳ線のオフを実行し（４０
８）、チャネル番号を更新し（４０９）、全チャネルが
ふさがりかを判断し（４１０）、チャネルに空があれ
ば、再送処理の為該当チャネルの空信号有かの判断（４
０２）から再度処理する。すべてのチャネルがふさがっ
てチャネルを使用できない時は、ビジー音（ＢＴ）を送
出する（４１１）ことで発呼者に対して全チャネルのふ
さがりを通知する。On the other hand, the exchange 1 returns the identification signal IDs sequentially sent (504). At this time, if there is a level difference between the signals sent from the mobile station 3 and the mobile station 3 ', the signal with the higher level will be received by the signal receiver 1R. In this embodiment, the signal from the mobile station 3 is sent to the signal receiver 1
When received by R, the fourth digit ID4 (3) is returned to the mobile station 3 and the mobile station 3 '. The mobile station transmission control program 400 accommodated in the central processing unit 3P ′ of the mobile station 3 ′ that has received the ID4 (3) detects a mismatch with the identification signal ID4 ′ (4) sent in step 407, and restores the signal. Therefore, turn off the SS line of track 3T '(40
8), the channel number is updated (409), it is judged whether all channels are occupied (410), and if there is an empty channel, it is judged whether there is an empty signal on the corresponding channel for retransmission processing (4).
Process from 02) again. When all channels are occupied and the channels cannot be used, a busy tone (BT) is sent (411) to notify the caller of the blockage of all channels.
【００１８】一方、識別番号ＩＤの不一致を検出しない
移動局３の中央処理装置３Ｐに収容された移動局発信制
御プログラム４００はひきつづき上述した処理を行う。On the other hand, the mobile station transmission control program 400 accommodated in the central processing unit 3P of the mobile station 3 which does not detect the discrepancy of the identification numbers ID continuously performs the above-mentioned processing.
【００１９】このように本実施例によれば、複数の移動
局が同時に発信した場合でも、１つの移動局の発信は受
け入れ、他の移動局は、再試行に入れるようになり、も
し再度衝突が発生しても、移動局と交換局間に設けられ
たチャネルを全て再試行することで発信衝突時の処理が
効率的に行え、かつ、再試行により、全チャネルふさが
りにあう確立は少なく、呼損を最小限におさえることが
できサービス品質が向上する。As described above, according to this embodiment, even when a plurality of mobile stations simultaneously make a call, the call from one mobile station is accepted and the other mobile stations are allowed to try again. Even if occurs, all the channels provided between the mobile station and the switching center can be retried to efficiently handle the processing at the time of the origination collision, and by the retry, the probability that all channels will be blocked is small, Call loss can be minimized and service quality improved.
【００２０】[0020]
【発明の効果】上述した本発明によれば、複数の端末が
同時に発信した場合でも、交換機に送られて来た端末識
別番号を再び端末側に返送し、これを端末が受信するこ
とにより、自端末の発信要求が受け付けられたかが判定
できる。この判定により、受け付けられた端末は処理を
続行し、受け付けられなかった端末は再試行を行う。According to the present invention described above, even when a plurality of terminals make calls at the same time, the terminal identification number sent to the exchange is sent back to the terminal side, and the terminal receives it, It is possible to determine whether the call origination request of the own terminal has been accepted. Based on this determination, the accepted terminal continues the process, and the unaccepted terminal retries.
【００２１】これにより、複数の端末が同時に発信した
場合でも１端末のみを受け入れ、他端末は再試行をする
ことで、発信衝突時の処理が効率的に行え、かつ、すべ
ての発信が呼損とならずサービス品質を大巾に向上する
という効果がある。By this, even when a plurality of terminals make a call at the same time, by accepting only one terminal and retrying by another terminal, the processing at the time of a call collision can be efficiently performed, and all calls are lost. This has the effect of significantly improving service quality.
【００２２】また、本発明は既存のハードウェアを利用
し、ソフトウェアのみの変更で実施できるという効果も
ある。Further, the present invention has an effect that it can be implemented by using existing hardware and changing only software.
【図１】本発明の移動体通信に適用した一実施例の構成
図、FIG. 1 is a configuration diagram of an embodiment applied to mobile communication of the present invention,
【図２】本実施例における交換局と移動局間の正常時の
信号シーケンスを示す図、FIG. 2 is a diagram showing a signal sequence at a normal time between a switching center and a mobile station in the present embodiment,
【図３】本実施例における２つの移動局が同時に発信し
た時の信号シーケンスを示す図、FIG. 3 is a diagram showing a signal sequence when two mobile stations simultaneously transmit in this embodiment,
【図４】本実施例の移動局における発信制御の流れ図、FIG. 4 is a flow chart of transmission control in the mobile station of the present embodiment,
【図５】本実施例の交換局における発信制御の流れ図を
示す。FIG. 5 shows a flow chart of transmission control in the exchange of the present embodiment.
１． 交換局、 ２． 基地局、 ３． 移動局、 ３'. 移動局、 １Ｓ，３Ｓ，３Ｓ'. 信号送信器、 １Ｒ，３Ｒ，３Ｒ'. 信号受信器、 １Ｐ，３Ｐ，３Ｐ'. 中央処理装置、 １Ｔ，３Ｔ，３Ｔ'. トランク、 ３Ｂ，３Ｂ'. ビジー音送出器、 １Ｎ，３Ｎ，３Ｎ'. ネットワーク。 1. Exchange, 2. base station, 3. Mobile station, 3 '. Mobile station, 1S, 3S, 3S '. Signal transmitter, 1R, 3R, 3R '. Signal receiver, 1P, 3P, 3P '. Central processing unit, 1T, 3T, 3T '. Trunk, 3B, 3B '. Busy sound transmitter, 1N, 3N, 3N '. Network.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 福里 良二 神奈川県横浜市戸塚区戸塚町216番地株式 会社日立製作所戸塚工場内 (72)発明者 太田 正孝 神奈川県川崎市麻生区王禅寺1099番地株式 会社日立製作所システム開発研究所内 (72)発明者 成瀬 浩一 神奈川県横浜市戸塚区戸塚町216番地株式 会社日立製作所戸塚工場内 (72)発明者 奥津 雄次 東京都小平市御幸町32番地日立電子株式会 社小金井工場内 (72)発明者 今井 直文 東京都千代田区丸の内一丁目６番５号東海 旅客鉄道株式会社内 (72)発明者 田中 初男 東京都千代田区丸の内一丁目６番５号東海 旅客鉄道株式会社内 (72)発明者 生田 弘美 大阪府大阪市北区大深町１番地１号西日本 旅客鉄道株式会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Ryoji Fukusato 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Totsuka factory (72) Inventor Masataka Ota 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Stock Hitachi Systems Development Laboratory (72) Inventor Koichi Naruse 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Totsuka factory (72) Inventor Yuji Okatsu Hitachi Electronics Co., Ltd. 32 Miyuki-cho, Kodaira-shi, Tokyo Inside the Koganei factory (72) Inventor Naofumi Imai 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Tokai Passenger Railway Co., Ltd. (72) Inventor Hatsuo Tanaka 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Tokai Passenger Railway Co., Ltd. (72) Inventor Hiromi Ikuta Osaka Prefecture Osaka City Kita-ku 1Fukamachi 1 West Japan Passenger Railway Co., Ltd.
Claims (2)
末間で共有する回線から成るランダムアクセス通信シス
テムにおいて、該端末発信時に端末識別信号を該交換機
に送出し、前記端末から送られて来た信号のうち、所定
レベルの信号のみを前記交換機が受信し、該受信した端
末識別信号を前記端末に返送し、返送されてきた前記端
末識別信号と自己の端末識別信号とを比較し、一致した
場合、自分の発信が受け付けられたことを認識して通信
を継続することを特徴とするランダムアクセス通信にお
ける発信衝突検出方式。1. A random access communication system comprising an exchange, a plurality of terminals, and a line shared between terminals connecting these terminals, wherein a terminal identification signal is transmitted to the exchange when the terminal originates, and is transmitted from the terminal. Among the signals, the exchange receives only a signal of a predetermined level, returns the received terminal identification signal to the terminal, compares the returned terminal identification signal with its own terminal identification signal, and matches. In this case, the outgoing call collision detection method in random access communication is characterized in that it recognizes that its outgoing call has been accepted and continues the communication.
の結果、不一致の場合、自分の発信が拒否されたことを
認識し、別の回線を使用し、通信をやりなおすことを特
徴とする請求項１記載のランダムアクセス通信における
発信衝突検出方式。2. If the result of the comparison of the terminal identification signals in the terminal indicates a mismatch, the terminal recognizes that its own call is rejected, uses a different line, and restarts the communication. The outgoing collision detection method in the random access communication according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3187247A JPH0537644A (en) | 1991-07-26 | 1991-07-26 | System for detecting collision of outgoing call |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3187247A JPH0537644A (en) | 1991-07-26 | 1991-07-26 | System for detecting collision of outgoing call |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0537644A true JPH0537644A (en) | 1993-02-12 |
Family
ID=16202625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3187247A Pending JPH0537644A (en) | 1991-07-26 | 1991-07-26 | System for detecting collision of outgoing call |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537644A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007128301A1 (en) | 2006-05-09 | 2007-11-15 | Zf Friedrichshafen Ag | Joint assembly for a vehicle |
| US8348541B2 (en) | 2006-05-09 | 2013-01-08 | Zf Friedrichshafen Ag | Joint arrangement for a vehicle |
-
1991
- 1991-07-26 JP JP3187247A patent/JPH0537644A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007128301A1 (en) | 2006-05-09 | 2007-11-15 | Zf Friedrichshafen Ag | Joint assembly for a vehicle |
| US8147161B2 (en) | 2006-05-09 | 2012-04-03 | Zf Friedrichshafen Ag | Joint arrangement for a vehicle |
| US8348541B2 (en) | 2006-05-09 | 2013-01-08 | Zf Friedrichshafen Ag | Joint arrangement for a vehicle |
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