DE3536505A1 - Method for setting up a connectionless acknowledged messaging service in communications systems - Google Patents

Method for setting up a connectionless acknowledged messaging service in communications systems

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Publication number
DE3536505A1
DE3536505A1 DE19853536505 DE3536505A DE3536505A1 DE 3536505 A1 DE3536505 A1 DE 3536505A1 DE 19853536505 DE19853536505 DE 19853536505 DE 3536505 A DE3536505 A DE 3536505A DE 3536505 A1 DE3536505 A1 DE 3536505A1
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Germany
Prior art keywords
station
message
acknowledgment
signal
acknowledged
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.)
Withdrawn
Application number
DE19853536505
Other languages
German (de)
Inventor
Rainer Dr Ing Portscht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
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Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19853536505 priority Critical patent/DE3536505A1/en
Publication of DE3536505A1 publication Critical patent/DE3536505A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L2001/125—Arrangements for preventing errors in the return channel

Abstract

To set up a reliable and low-cost connectionless acknowledged messaging service in communications systems in which each message transmitted by a transmitting station A and correctly received is normally acknowledged by the receiving station B via an acknowledgement signal Q1, it is proposed that the transmitting station A, having transmitted a message for which it does not receive an acknowledgement signal Q1 of a first type from the receiving station B, transmits an acknowledgement request signal QA to the receiving station B at the end of a pre-defined monitoring time. If station B received the message but its acknowledgement signal Q1 was lost, station B retransmits the acknowledgement signal Q1. If station B did not receive the message, it transmits an acknowledgement signal Q2 of a second type to station A, whereupon station A retransmits the message.

Description

Die Erfindung betrifft ein Verfahren zur Einrichtung eines verbindungslosen quittierten Botschaftsdienstes in Kommunikationssystemen der im Oberbegriff des Patentan­ spruchs 1 genannten Art.The invention relates to a method for setting up a connectionless acknowledged embassy service in Communication systems in the preamble of patent Proverb 1 mentioned.

In Kommunikationssystemen sind im wesentlichen zwei Arten von Diensten zur Übertragung von Daten zwischen den an des Kommunikationssystem angeschlossenen Stationen bekannt und eingeführt:There are essentially two types in communication systems of services for the transmission of data between the other Communication system connected stations known and introduced:

  • a) der einfache verbindungslose unquittierte Botschafts­ dienst, a) the simple connectionless unacknowledged message service,  
  • b) der relativ aufwendige verbindungsbezogene Dienst, bei dem nach Aufbau einer logischen Verbindung in beiden Richtungen alle Daten numeriert und quittiert werden.b) the relatively complex connection-related service, in which after establishing a logical connection in All data are numbered and acknowledged in both directions will.

Beispiele und die Normung für die beiden Dienstarten sind ausführlich beschrieben in dem Buch: IEEE Standards for Local Area Networks: Logical Link Control, ANSI/IEEE Std 802.2-1985, ISO Draft International Standard 8802/2. ISBN 0-471-82748-7, Library of Congress Catalog Nummer 84-43095, Copyright 1984 by The Institue of Electrical and Electronics Enginners, Inc, 345 East 47th Street, New York, NY 10017, USA.Examples and standardization are for the two types of service described in detail in the book: IEEE Standards for Local Area Networks: Logical Link Control, ANSI / IEEE Std 802.2-1985, ISO Draft International Standard 8802/2. ISBN 0-471-82748-7, Library of Congress Catalog number 84-43095, Copyright 1984 by The Institue of Electrical and Electronics Enginners, Inc, 345 East 47th Street, New York, NY 10017, USA.

Im Fall a) (LLC Description of Type 1 Procedures) werden nicht numerierte und unquittierte Protokolldateneinheiten oder Datenblöcke (UI PDU) zwischen den Stationen über das lokale Netz ausgetauscht, ohne daß Verbindungen auf- oder abgebaut werden. Hierbei können in unerwünschter Weise Botschaften verloren gehen.In case a) (LLC Description of Type 1 Procedures) Unnumbered and unacknowledged protocol data units or data blocks (UI PDU) between the stations via the local network exchanged without connections on or be dismantled. This can be undesirable Messages get lost.

Im Fall b) (LLC Description of Type 2 Procedures) werden logische Verbindungen zwischen den Stationen und den an die Stationen angeschlossenen Benutzer-Endgeräte auf- und abgebaut, sowie überwacht. In diesen Fällen findet der Datentransfer in geordneter Weise mit numerierten und quittierten Datenpaketen statt. Dieses Verfahren der verbindungsbezogenen Datenübertragungen mittels logischer Verbindungen hat jedoch den Nachteil, daß die Anzahl der Zustände und Anreize sehr groß ist und daß das LLC-Pro­ tokoll für diese Art der Übertragung sehr aufwendig ist. In case b) (LLC Description of Type 2 Procedures) logical connections between the stations and the other the stations connected user terminals on and mined and monitored. In these cases the Data transfer in an orderly manner with numbered and acknowledged data packets instead. This procedure of connection-related data transfers using logical However, connections has the disadvantage that the number of Conditions and incentives are huge and that the LLC Pro tokoll for this type of transmission is very complex.  

Werden lediglich selten Daten von einer zu einer anderen Station übertragen, so werden entweder die Stationen durch die Überwachung der bestehenden Verbindungen ständig belastet, oder es muß für jede Datenübertragung die Ver­ bindung auf- und wieder abgebaut werden.Only rarely is data from one to another Station, so either the stations are through the monitoring of the existing connections constantly charged, or the Ver bond to be built and dismantled.

Der Erfindung liegt die Aufgabe zugrunde, den Stand der Technik zu verbessern. Insbesondere soll ein einfacher, quittierter Botschaftsdienst angegeben werden, der den hohen Aufwand für den verbindungsbezogenen Dienst vermei­ det.The invention has for its object the state of the Improve technology. In particular, a simple, acknowledged embassy service to be given to the Avoid high costs for the connection-related service det.

Die Aufgabe wird durch die im kennzeichnenden Teil des An­ spruchs 1 genannte Erfindung gelöst. Bei Anwendung des erfindungsgemäßen Verfahrens können nunmehr keine Daten unbemerkt verloren gehen und der Aufwand für das Daten­ übertragungs-Protokoll, also für das Aussenden der Quit­ tung oder der Quittungsanforderung, ist gering. Da immer nur dann eine weitere Botschaft (Datenpaket) ausgesendet wird, wenn die Quittung für die vorausgesendete Botschaft erhalten wurde, ist es nicht erforderlich, die einzelnen Datenpakete zu numerieren und die dabei auftretenden vielen möglichen Zustände zu verwalten und zu überwachen. Außerdem ist es vorteilhaft, bei nichtempfangener Quittung anstelle des gesamten Datenpakets lediglich ein kurzes Quittungsanforderungssignal zu senden, wobei freie Codie­ rungsfelder der genormten Protokolldateneinheiten (UI PDU) benutzt werden können.The task is carried out by the in the characterizing part of the To claim 1 called invention solved. When using the The method according to the invention can now no data are lost unnoticed and the effort for the data Transmission protocol, i.e. for sending the quit tion or the receipt request is low. There always only then sent another message (data packet) when the receipt for the pre-sent message was obtained, it is not necessary for the individual Numbering data packets and the occurring ones manage and monitor many possible states. It is also advantageous if the receipt is not received instead of the entire data packet, just a short one Send acknowledgment request signal, free code fields of the standardized protocol data units (UI PDU) can be used.

Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. Das Verfahren nach Anspruch 3 ist dann vorteilhaft, wenn die zu übertragende Botschaft nicht wesentlich größer als der äußere Rahmen einer Protokolldateneinheit ist.Advantageous further developments and refinements of Invention are specified in the subclaims. The The method of claim 3 is advantageous if the  message to be transmitted is not significantly larger than that is the outer frame of a log data unit.

Die Erfindung wird nun im folgenden näher erläutert. Es wird vorausgesetzt, daß von einer Mehrzahl von Sende- und Empfangsstationen jeweils lediglich eine das Übertragungs­ medium benutzt. Das erfindungsgemäße Verfahren ist daher besonders für lokale Netze von Vorteil. In einem derarti­ gen Kommunikationssystem ist es bekannt, zur Einrichtung eines verbindungslosen quittierten Botschaftsdienstes jede von einer Sendestation A gesendete und ordnungsgemäß von der Empfangsstation B empfangene Botschaft von der Emp­ fangsstation B durch ein an die Sendestation A gerichtetes Quittungssignal quittieren zu lassen. Dieses Quittungs­ signal sei Quittungssignal Q 1 erster Art genannt. Es können nun folgende Fehler bei der Datenübertragung auftreten: Fehler 1: die gesendete Botschaft wird gestört und kann von der Empfangsstation B nicht erkannt oder ausgewertet werden oderThe invention will now be explained in more detail below. It is assumed that only one of the plurality of transmitting and receiving stations uses the transmission medium. The method according to the invention is therefore particularly advantageous for local networks. In such a communication system, it is known to set up a connectionless acknowledged message service to have each message sent by a transmitting station A and properly received by the receiving station B by the receiving station B by an acknowledgment signal directed to the transmitting station A. This acknowledgment signal is called acknowledgment signal Q 1 of the first kind. The following errors can now occur during data transmission: Error 1: the sent message is disturbed and can not be recognized or evaluated by the receiving station B or

  • Fehler 2: die gesendete Botschaft kommt ungestört bei der Empfangsstation B an, aber das Quittungssignal Q 1 wird gestört und kann von der Sendestation A nicht erkannt oder verwertet werden.Error 2: the sent message arrives undisturbed at the receiving station B , but the acknowledgment signal Q 1 is disturbed and cannot be recognized or used by the transmitting station A.

Gemäß der Erfindung sendet nun die Sendestation A nach Aussenden einer Botschaft, für die sie nicht ein Quit­ tungssignal Q 1 von der Empfangsstation B empfängt, nach Ablauf einer vorgegebenen Überwachungszeit ein an die Empfangsstation B gerichtetes Quittungsanforderungssignal QA. Die Dauer der Überwachungszeit richtet sich nach der maximalen Signallaufzeit im Kommunikationssystem.According to the invention, the transmitting station A now sends an acknowledgment request signal QA directed to the receiving station B after a predetermined monitoring time has elapsed after sending out a message for which it does not receive a confirmation signal Q 1 from the receiving station B. The duration of the monitoring time depends on the maximum signal runtime in the communication system.

Hat die Empfangsstation B die Botschaft der Station A nicht aufnehmen können, jedoch das Quittungsanforderungs­ signal QA empfangen, sendet sie ein Quittungssignal Q 2 zur Sendestation A, woraus diese erkennt, daß die Botschaft gestört wurde. Sie sendet daraufhin die Botschaft nochmals an die Station B.If the receiving station B could not receive the message from station A , but received the acknowledgment request signal QA , it sends an acknowledgment signal Q 2 to the transmitting station A , from which it recognizes that the message has been disturbed. It then sends the message to station B again .

Hat jedoch die Station B die Botschaft von Station A ordnungsgemäß empfangen und das Quittungssignal der Sta­ tion B wurde gestört, so sendet die Station B nach Empfang des Quittungsanforderungssignals QA nochmals das Quit­ tungssignal Q 1.However, if station B has properly received the message from station A and the acknowledgment signal from station B has been disturbed, station B will send the acknowledgment signal Q 1 again after receipt of the acknowledgment request signal QA .

Sollte nach n Wiederholungen des Quittungsanforderungs­ signals QA immer noch kein Quittungssignal Q 1 oder Q 2 bei der Station A eintreffen, so bedeutet dies, daß eine ordnungsgemäße Datenübertragung nicht mehr möglich ist. Je nach Ausbau des Kommunikationssystems können nun Fehler­ behandlungsroutinen gestartet werden, um den Grund für das Ausbleiben des Quittungssignals zu ermitteln und Maßnahmen zur Behebung eines eventuellen Defektes einzuleiten.If, after n repetitions of the acknowledgment request signal QA , no acknowledgment signal Q 1 or Q 2 still arrives at station A , this means that correct data transmission is no longer possible. Depending on the configuration of the communication system, error handling routines can now be started to determine the reason for the absence of the acknowledgment signal and to initiate measures to remedy a possible defect.

Bei kurzen Botschaften, deren Länge in der Größenordnung des Quittungsanforderungssignals liegen, ist es vorteil­ haft, wenn das Quittungsanforderungssignal QA zusätzlich die nichtquittierte Botschaft enthält, da dann im Fall des Fehlers 1 mit dem Empfang des Quittungssignals Q 1 der Station B die Station A gegebenenfalls die nächste Bot­ schaft absenden kann. For short messages, the length of which are of the order of the acknowledge request signal, it is advantageous when the acknowledgment request signal QA additionally contains the Unacknowleged message, because then in case of the failure 1 and the reception of the acknowledgment signal Q 1 of the station B, the station A, where appropriate, can send the next message.

Da bei diesem verbindungslosen quittierten Botschafts­ dienst lediglich 2 Arten von Quittungssignalen und ein Quittungsanforderungssignal für das Datenübertragungs­ protokoll erforderlich sind, ist dieser Dienst aufwandsarm zu realisieren und damit besonders für die Anwendung in lokalen Netzen geeignet.Because with this connectionless acknowledged message only serve 2 types of acknowledgment signals and one Acknowledgment request signal for the data transmission protocol is required, this service requires little effort to realize and thus especially for the application in local networks.

Claims (4)

1. Verfahren zur Einrichtung eines verbindungslosen quittierten Botschaftsdienstes in Kommunikationssystemen, bei dem im Regelfall jede von einer Sendestation (A) gesendete und ordnungsgemäß empfangene Botschaft von der Empfangsstation (B) durch ein Quittungssignal (Q 1) erster Art quittiert wird, dadurch gekennzeichnet, daß die Sen­ destation (A) nach Aussenden einer Botschaft, für die sie nicht ein Quittungssignal (Q 1) erster Art von der Em­ pfangsstation (B) empfängt, nach Ablauf einer vorgegebenen Überwachungszeit ein Quittungsanforderungssignal (QA) an die Empfangsstation (B) sendet, und daß die Empfangssta­ tion (B) bei Empfang des Quittungsanforderungssignals (QA) und empfangener Botschaft nochmals das Quittungssignal (Q 1) erster Art und bei nicht empfangener Botschaft ein Quittungssignal (Q 2) zweiter Art zur Sendestation (A) sendet. 1. A method for setting up a connectionless acknowledged embassy service in communication systems, in which, as a rule, each message sent and properly received by a transmitting station (A) is acknowledged by the receiving station (B) by an acknowledgment signal ( Q 1 ) of the first type, characterized in that the Sen destation (a) by sending a message for which it is not an acknowledgment signal (Q 1) of the first type from the Em pfangsstation (B) receives, after a predetermined monitoring time an acknowledgment request signal (QA) to the receiving station (B) sends, and that the receiving station (B) on receipt of the acknowledgment request signal ( QA) and received message again sends the acknowledgment signal ( Q 1 ) of the first type and, if the message is not received, sends an acknowledgment signal ( Q 2 ) of the second type to the transmitting station (A) . 2. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß bei Ausbleiben eines Quittungssignals (Q 1 oder Q 2) das Quittungsanforderungssignal (QA) von der Sendestation n-mal (n bedeutet eine vorgegebene ganze Zahl) wiederholt wird und daß nach erfolgloser Wiederholung die Sendesta­ tion (A) ein Fehlerprogramm startet.2. The method according to claim 2, characterized in that in the absence of an acknowledgment signal ( Q 1 or Q 2 ), the acknowledgment request signal (QA) from the transmitting station n times (n means a predetermined integer) is repeated and that after unsuccessful repetition, the sendingta tion (A) an error program starts. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß das Quittungsanforderungssignal (QA) zusätzlich die nicht quittierte Botschaft enthält.3. The method according to claim 2, characterized in that the acknowledgment request signal (QA) additionally contains the unacknowledged message. 4. Verfahren nach einem der vorangegangenen Ansprüche, gekennzeichnet durch seine Verwendung in einem lokalen Netz.4. The method according to any one of the preceding claims, characterized by its use in a local Network.
DE19853536505 1985-10-12 1985-10-12 Method for setting up a connectionless acknowledged messaging service in communications systems Withdrawn DE3536505A1 (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
DE4128974A1 (en) * 1991-08-31 1993-03-04 Telefunken Electronic Gmbh OPERATING A SYSTEM USING A REMOTE CONTROL
US5604923A (en) * 1994-11-15 1997-02-18 At&T Global Information Solutions Company Electronic display system capable of displaying communication signal strength on individual electronic display modules and method of using the same
WO1998015090A1 (en) * 1996-09-30 1998-04-09 Telefonaktiebolaget Lm Ericsson Method and apparatus for selectively transmitting packets of message data to a remote communication station
WO1998015089A1 (en) * 1996-09-30 1998-04-09 Telefonaktiebolaget Lm Ericsson Method and apparatus for determining activation status of a receiving station of a radio communication system
EP2882129A3 (en) * 2013-12-06 2015-07-29 HTC Corporation Method for handling device-to-device communication

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128974A1 (en) * 1991-08-31 1993-03-04 Telefunken Electronic Gmbh OPERATING A SYSTEM USING A REMOTE CONTROL
US5604923A (en) * 1994-11-15 1997-02-18 At&T Global Information Solutions Company Electronic display system capable of displaying communication signal strength on individual electronic display modules and method of using the same
WO1998015090A1 (en) * 1996-09-30 1998-04-09 Telefonaktiebolaget Lm Ericsson Method and apparatus for selectively transmitting packets of message data to a remote communication station
WO1998015089A1 (en) * 1996-09-30 1998-04-09 Telefonaktiebolaget Lm Ericsson Method and apparatus for determining activation status of a receiving station of a radio communication system
US5903557A (en) * 1996-09-30 1999-05-11 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for determining activation status of a receiving station of a radio communication system
US5907546A (en) * 1996-09-30 1999-05-25 Telefonaktiebolaget L/M Ericsson Method and apparatus for selectively transmitting packets of message data to a remote communication station
AU720222B2 (en) * 1996-09-30 2000-05-25 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for determining activation status of a receiving station of a radio communication system
AU725898B2 (en) * 1996-09-30 2000-10-26 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for selectively transmitting packets of message data to a remote communication station
EP2882129A3 (en) * 2013-12-06 2015-07-29 HTC Corporation Method for handling device-to-device communication
US9674856B2 (en) 2013-12-06 2017-06-06 Htc Corporation Method of handling device-to-device communication and communication device thereof

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