EP0976298A1 - Method for subscriber information transfer in a local line distribution network - Google Patents

Method for subscriber information transfer in a local line distribution network

Info

Publication number
EP0976298A1
EP0976298A1 EP98928063A EP98928063A EP0976298A1 EP 0976298 A1 EP0976298 A1 EP 0976298A1 EP 98928063 A EP98928063 A EP 98928063A EP 98928063 A EP98928063 A EP 98928063A EP 0976298 A1 EP0976298 A1 EP 0976298A1
Authority
EP
European Patent Office
Prior art keywords
subscriber
information
packet data
time slots
channel
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Withdrawn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
EP98928063A
Other languages
German (de)
French (fr)
Inventor
Ulrich Gremmelmaier
Manfred Huber
Gernot Von Der Straten
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.)
Siemens AG
Original Assignee
Siemens AG
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.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0976298A1 publication Critical patent/EP0976298A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0457—Connection protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5672—Multiplexing, e.g. coding, scrambling
    • H04L2012/5675—Timeslot assignment, e.g. TDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6445—Admission control
    • H04L2012/6448—Medium Access Control [MAC]
    • H04L2012/6454—Random, e.g. Ethernet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6445—Admission control
    • H04L2012/6459—Multiplexing, e.g. TDMA, CDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6475—N-ISDN, Public Switched Telephone Network [PSTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13174—Data transmission, file transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13201—Change-over of service during connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13204—Protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216—Code signals, frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1329—Asynchronous transfer mode, ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13293—TASI, irregular time division, burst switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13296—Packet switching, X.25, frame relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13332—Broadband, CATV, dynamic bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13392—Channels assigned according to rules

Definitions

  • the invention relates to a method for subscriber-side information transmission in a connecting line network according to the preamble of claim 1.
  • Modern telecommunications networks have digital access line networks in the subscriber access area that connect one or more local exchanges to subscriber terminals via subscriber access lines.
  • Line networks were originally conceived for the transmission of low-frequency information signals, such as in analogue telephony or when using narrowband services.
  • the bit rate transmitted on the subscriber side in the access network is, for example, narrowband ISDN 2 x 64 kBit / s for 2 B channels (user channels) plus 16 kBit / s for a D channel (control channel) such that the longest occurring connecting lines can still be used.
  • narrowband ISDN 2 x 64 kBit / s for 2 B channels (user channels) plus 16 kBit / s for a D channel (control channel) such that the longest occurring connecting lines can still be used.
  • a large part of the maximum reliably transmissible bit rate ie the maximum bandwidth in the area of the connecting line network with shorter connecting lines, remains unused.
  • the damping measure for symmetrical double cores of copper connecting lines which limits the range of the digital signal transmission, increases with the line length.
  • connection line networks designed for narrowband services are consequently also suitable for the transmission of broadband services.
  • procedures have become established with which the existing copper lines in the connection network can be used for the transmission of digital information signals. These include, for example the so-called ADSL method (from the English-speaking From ⁇ pressure "Asymmetrical Digital Subscriber Line” for "asymmetrical digital subscriber line”) and the so-called HDSL process (from the English term "high bit rate Digital Subscriber Line” for "digital subscriber line for high bit rate” ).
  • DE 43 43 982 describes a connection line network with subscriber lines for the transmission of digital information signals, in which bit patterns are sent from a local exchange over a subscriber line and the bit patterns which are mirrored and returned to the subscriber are evaluated in order to determine the maximum possible bit rate per transmission line. The bit patterns received are then evaluated in the exchange. The maximum possible bit rate is then determined depending on the results.
  • a method for transmitting information signals in a connection line network via subscriber lines in which transmission parameters of the subscriber line are measured and settings are made in the exchange and subscriber settings in accordance with the measurement results. These settings are, for example, the maximum bit rate that can be transmitted safely and, if applicable, the transmission method.
  • the bit rate and transmission method can be carried out adaptively on a line-by-line basis as a function of the physical transmission parameters. This makes it possible, in addition to a D channel with a bandwidth of 16 kbit / s, to transmit several user channels, each with a bandwidth of 64 kbit / s.
  • the maximum number of user channels that can be transmitted depends on the bandwidth of the individual subscriber line configuration, in particular on the length of the subscriber line.
  • a method for subscriber-side information transmission in such connection line networks is from the article by MN Huber and PJ Kühn, Modeling of a Multi-Queue Polling System with Arbitrary Server Interrupts for the Idle-Slot-Concatenation Packet Switching Principle in a Hybrid CS / PS Node; Proceedings of the 12th International Teletraffic Congress, Torino, 1988, known to provide an information transport frame that is divided into equally sized time slots.
  • Each of these time slots is either occupied with switching system data (CS data from the English term circuit switching) or with packet data (PS data from the English language phrase packet switching), all the time slots not occupied with switching system data being combined to form a remaining packet data transport channel (idle slot concatenation).
  • the type of traffic from which the remaining packet data transport channel is occupied is determined by the connection configuration, in particular by the packet data protocol that can be edited by the subscriber-side protocol evaluation device.
  • the invention is based on the object of specifying a method for subscriber-side information transmission which enables a more flexible use of connecting line networks.
  • the invention solves this problem in that each time slot of the remaining packet data Transport channel a protocol discriminator is inserted. This protocol discriminator enables the data contained in a time slot of the remaining packet data transport channel to be uniquely assigned to a traffic type, so that a traffic-type-specific protocol evaluation can be carried out in each case.
  • the method according to the invention thus makes it possible to use the remaining packet data transport channel, which subsequently also is the ISC channel (from the English term idle slot
  • Concatenation is called, by different types of traffic, such as ATM and LAN.
  • a further development of a method according to the invention provides that for the transmission of messages of variable length in the remaining packet data transport channel, each message is preceded by its length.
  • the length of a message is in each case predetermined by the constant length of an ATM cell, so that the protocol discriminator suffices to know the length of each message on the receiver side.
  • messages of variable length e.g. 16 bit word
  • a length specification inserted per message can be transmitted.
  • Another development of a method according to the invention provides for the transmission of messages of variable length not to occupy a time slot of the remaining packet data transport channel in the remaining packet data transport channel between two messages.
  • time slots of the information transport frame in a further development of a method according to the invention Because it corresponds to a 64 kbit / s channel, the low-loss transmission of information from an ISDN basic access is possible, which has two useful information channels with 64 kbit / s transmission capacity and a signaling channel with 16 kbit / s transmission capacity.
  • a particularly favorable further development of a method according to the invention results if the duration of an information transport frame is 0.125 milliseconds in each case.
  • the structure of an information transport frame according to the invention corresponds to a modified version of a standardized ISDN primary rate connection.
  • the number of time slots of an information transport frame is preferably between 5 and 32, depending on the bit rate of a transmission system in which the method is used.
  • a favorable embodiment of a method according to the invention for subscriber-side information transmission provides that a time slot of the information transport frame is used for frame control and a time slot for ISDN signaling. These time slots provided for the transmission of control information are preferably arranged at fixedly defined locations within the information transport frame. The time slot used for frame control is preferably provided at the beginning of an information transport frame in order to enable simple synchronization.
  • the information transport frame is divided into an even number of time slots, synchronization is additionally facilitated if the time interval between the time slot used for frame control and the time slot used for ISDN signaling of an information transport frame is the same as the time interval between it and the ISDN Signaling used time slot and the time slot used for frame control of the subsequent information transport frame.
  • FIG. 1 shows an exemplary embodiment of an information transport frame and the conversion of the information from an ATM cell into the ISC channel of this information transport frame
  • Figure 2 shows a schematic block diagram of an exemplary embodiment of a connecting line network for connecting a subscriber unit to an ISDN network, an ATM network and a LAN network.
  • the remaining time slots 2 to 10 and 12 to 20 can in principle be freely assigned with switching system data or packet data.
  • time slots 3, 6, 7, 9, 12, 15, 17, 18 and 20 are occupied with switching system data in the form of ISDN user channel information.
  • ISDN payload channel information can be, for example, facsimile information or voice information.
  • Time slots 2, 4, 5, 8, 10, 13, 14, 16 and 19 together form an ISC channel for the transmission of packet data.
  • an ATM cell ATM shown in FIG. 1 is transmitted in the ISC channel of the information transport frame.
  • the information contained in the ATM cell ATM is shown in Divided information parts 1, 2, 3, 4, each Informa tion ⁇ part 1, 2, 3, 4 is smaller than that of a time slot of the information transport frame Transd bare amount of information PS.
  • a protocol discriminator PD is added to each of the pieces of information 1, 2, 3, 4 of the ATM cell information. In the illustration according to FIG. 1, this is arranged on the left side, that is to say at the beginning of the information PS, for a time slot.
  • FIG. 2 shows a schematic block diagram of a connecting line network AN with a switching node CPN for switching through switching system data and packet data to a subscriber connecting line and thus in the exemplary embodiment shown for connecting a subscriber line unit SSU (subscriber unit) to an ISDN network ISDN-NET an ATM network ATM-NET and to a local data network LAN.
  • SSU subscriber unit
  • the subscriber-side information transmission that is to say the information transmission between subscriber unit SSU and the connecting line network AN takes place in the exemplary embodiment according to FIGS. 1 and 2 with the aid of information transport frames according to FIG. 1.
  • the first time slot of an information transport frame is used in each case for transmitting the frame control information Sync OAM and the eleventh time slot of an information transport frame is used to transmit the ISDN signaling information between the subscriber unit SSU and the ISDN network ISDN-NET.
  • Part of the time slots of an information transport frame is used for the transmission of ISDN user information between the subscriber unit SSU and the ISDN network ISDN-NET.
  • the remaining time slots of an information transport frames together form an ISC channel and either serve to transmit information between the subscriber unit SSU and the local data network LAN or between the subscriber unit SSU and the ATM network -ET.
  • the type of information transmitted in the time slots of the ISC channel is identified in each time slot PS by a protocol discriminator PD.
  • part 1, 2, 3, 4 of an ATM cell ATM is transmitted in each time slot of the packet data transport channel, so that the protocol discriminator PD in each case contains the information “ATM”.
  • the time slots with the packet data information PS can be collected and assembled on the receiver side, that is to say either in the line network AN or in the subscriber unit SSU (depending on the direction of transmission).
  • the ATM cell thus composed can then either be processed on the subscriber side or forwarded from the access line network AN to the ATM network ATMNET.
  • the protocol discriminator (not shown) of each time slot of the ISC channel must contain the information LAN accordingly, so that the information can be processed or forwarded accordingly.

Abstract

The invention relates to subscriber information transfer in a local line distribution network (AN) using as information transport framework divided into equal sized time slots. At least some of these time slots are useful channel time slots, each of which is occupied either by transfer system data (ISDN) or by packet data (PS), and all useful channel time slots not occupied by transfer system data (ISDN) are combined in a remaining packet data transport channel. A protocol discriminator (PD) is incorporated into each time slot of the remaining packet data transport channel, thus enabling a univocal allocation of the data contained in a time slot of the remaining packet data transport channel to a traffic type.

Description

Be s ehr e ibungBe honest
Verfahren zur teilnehmerseitigen Informationsübertragung in einem AnschlußleitungsnetzMethod for subscriber-side information transmission in a connection network
Die Erfindung betrifft ein Verfahren zur teilnehmerseitigen Informationsübertragung in einem Anschlußleitungsnetz gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for subscriber-side information transmission in a connecting line network according to the preamble of claim 1.
Moderne Telekommunikationsnetze verfügen im Teilnehmeran- schlußbereich über digitale Anschlußleitungsnetze, die eine oder mehrere Ortsvermittlungsstellen über Teilnehmeranschlußleitungen mit Teilnehmerendeinrichtungen verbinden.Modern telecommunications networks have digital access line networks in the subscriber access area that connect one or more local exchanges to subscriber terminals via subscriber access lines.
Anschlußleitungsnetze wurden ursprünglich zur Übertragung niederfrequenter Informationssignale wie beispielsweise beim analogen Fernsprechen oder bei der Verwendung von Schmal- banddiensten konzipier . Die im Anschlußleitungsnetz auf der Teilnehmerseite übertragene Bitrate ist hierbei beispiels- weise für Schmalband-ISDN 2 x 64 kBit/s für 2 B-Kanäle (Nutzkanäle) zuzüglich 16 kBit/s für einen D-Kanal (Steuerkanal) derart festgelegt, daß die längsten vorkommenden Anschlußleitungen noch genutzt werden können. Damit bleibt aber ein großer Teil der maximal zuverlässig übertrag- baren Bitrate, d.h. der maximalen Bandbreite im Anschlußleitungsnetzbereich mit kürzeren Anschlußleitungen ungenutzt . Das die Reichweite der Digitalsignalübertragung begrenzende Dämpfungsmaß für symmetrische Doppeladern von Kupferanschlußleitungen nimmt nämlich mit der Leitungslänge zu. Generell gilt, je kürzer die Länge einer Teilnehmeranschlußleitung um so höher kann die darüber zu übertragende Bitrate sein. Für Schmalbanddienste konzipierte Anschlußleitungsnetz eignen sich folglich auch für die Übertragung breitbandigerer Dienste. So haben sich in den letzten Jahren Verfahren durchge- setzt, mit denen die vorhandenen Kupferleitungen im Anschluß- leitungsnetz für die Übertragung von digitalen Informationssignalen genutzt werden können. Hierzu zählen beispielsweise das sogenannte ADSL- Verfahren (vom englischsprachigen Aus¬ druck "Asymmetrical Digital Subscriber Line" für "assymetrische digitale Teilnehmeranschlußleitung") und das sogenannte HDSL-Verfahren (vom englischsprachigen Ausdruck "High bit rate Digital Subscriber Line" für "digitale Teilnehmeranschlußleitung für hohe Bitrate" ) .Line networks were originally conceived for the transmission of low-frequency information signals, such as in analogue telephony or when using narrowband services. The bit rate transmitted on the subscriber side in the access network is, for example, narrowband ISDN 2 x 64 kBit / s for 2 B channels (user channels) plus 16 kBit / s for a D channel (control channel) such that the longest occurring connecting lines can still be used. However, a large part of the maximum reliably transmissible bit rate, ie the maximum bandwidth in the area of the connecting line network with shorter connecting lines, remains unused. The damping measure for symmetrical double cores of copper connecting lines, which limits the range of the digital signal transmission, increases with the line length. In general, the shorter the length of a subscriber line, the higher the bit rate to be transmitted. Connection line networks designed for narrowband services are consequently also suitable for the transmission of broadband services. In recent years, for example, procedures have become established with which the existing copper lines in the connection network can be used for the transmission of digital information signals. These include, for example the so-called ADSL method (from the English-speaking From ¬ pressure "Asymmetrical Digital Subscriber Line" for "asymmetrical digital subscriber line") and the so-called HDSL process (from the English term "high bit rate Digital Subscriber Line" for "digital subscriber line for high bit rate" ).
Die DE 43 43 982 beschreibt ein Anschlußleitungsnetz mit Teilnehmeranschlußleitungen zur Übertragung von digitalen Informationssignalen, in dem von einer Ortsvermittlungsstelle Bitmuster über eine Teilnehmeranschlußleitung gesandt werden und die beim Teilnehmer gespiegelt und wieder zurückgesandten Bitmuster ausgewertet werden, um die maximal mögliche Bitrate pro Übertragungsleitung festzulegen. In der Vermittlungsstel- le erfolgt dann die Auswertung der erhaltenen Bitmuster. In Abhängigkeit der Ergebnisse wird dann die maximal mögliche Bitrate festgelegt.DE 43 43 982 describes a connection line network with subscriber lines for the transmission of digital information signals, in which bit patterns are sent from a local exchange over a subscriber line and the bit patterns which are mirrored and returned to the subscriber are evaluated in order to determine the maximum possible bit rate per transmission line. The bit patterns received are then evaluated in the exchange. The maximum possible bit rate is then determined depending on the results.
Aus einer zum Prioritätstag der vorliegenden Anmeldung noch nicht veröffentlichten Patentanmeldung ist ein Verfahren zum Übertragen von Informationssignalen in einem Anschlußleitungsnetz über Teilnehmeranschlußleitungen bekannt, bei dem Übertragungsparameter der Teilnehmeranschlußleitung gemessen werden und nach Maßgabe der Meßergebnisse Einstellungen in der vermittlungsseitig und der teilnehmerseitig Einstellungen vorgenommen werden. Diese Einstellungen sind beispielsweise die maximal sicher übertragbare Bitrate und gegebenenfalls das Übertragungsverfahren. Dadurch können Bitrate und Übertragungsverfahren leitungsindividuell in Abhängigkeit von den physikalischen Übertragungsparametern adaptiv vorgenommen werden. Dadurch wird es möglich, zusätzlich zu einem D-Kanal mit einer Bandbreite von 16 kBit/s noch mehrere Nutzkanäle jeweils mit einer Bandbreite von 64 kBit/s zu Übertragen. Die maximal übertragbare Anzahl der Nutzkanäle hängt hierbei von der Bandbreite der individuellen Teilnehmeranschlußkonfiguration ab, insbesondere von der Länge der Teilnehmeranschluß- leitung. Als Verfahren zur teilnehmerseitigen Informationsübertragung in solchen Anschlußleitungsnetzen ist aus dem Artikel von M.N. Huber und P.J. Kühn, Modelling of a Multi-Queue Polling System with Arbitrary Server Interrupts for the Idle-Slot- Concatenation Packet Switching Principle in a Hybrid CS/PS Node; Proceedings of the 12th International Teletraffic Con- gress, Torino, 1988 bekannt, einen Informationstransport- rahmen vorzusehen, der in gleich große Zeitschlitze aufge- teilt ist. Jeder dieser Zeitschlitze wird entweder mit Vermittlungssystem-Daten (CS-Daten vom englischsprachigen Ausdruck Circuit Switching) oder mit Paketdaten (PS-Daten vom englischsprachigen Ausdruck Packet Switching) belegt, wobei alle nicht mit Vermittlungssystem-Daten belegten Zeitschlitze zu einem verbleibenden Paketdaten-Transportkanal zusammengefaßt werden (Idle Slot Concatenation) . Der Verkehrstyp, von dem der verbleibenden Paketdaten-Transportkanal belegt wird, z.B. ATM oder LAN/Ethernet, ist durch die Anschlußkonfigura- tion, insbesondere durch das von der teilnehmerseitigen Pro- tokollauswerteeinrichtung bearbeitbare Paketdaten-Protokoll festgelegt .From a patent application not yet published on the priority date of the present application, a method for transmitting information signals in a connection line network via subscriber lines is known, in which transmission parameters of the subscriber line are measured and settings are made in the exchange and subscriber settings in accordance with the measurement results. These settings are, for example, the maximum bit rate that can be transmitted safely and, if applicable, the transmission method. As a result, the bit rate and transmission method can be carried out adaptively on a line-by-line basis as a function of the physical transmission parameters. This makes it possible, in addition to a D channel with a bandwidth of 16 kbit / s, to transmit several user channels, each with a bandwidth of 64 kbit / s. The maximum number of user channels that can be transmitted depends on the bandwidth of the individual subscriber line configuration, in particular on the length of the subscriber line. A method for subscriber-side information transmission in such connection line networks is from the article by MN Huber and PJ Kühn, Modeling of a Multi-Queue Polling System with Arbitrary Server Interrupts for the Idle-Slot-Concatenation Packet Switching Principle in a Hybrid CS / PS Node; Proceedings of the 12th International Teletraffic Congress, Torino, 1988, known to provide an information transport frame that is divided into equally sized time slots. Each of these time slots is either occupied with switching system data (CS data from the English term circuit switching) or with packet data (PS data from the English language phrase packet switching), all the time slots not occupied with switching system data being combined to form a remaining packet data transport channel (idle slot concatenation). The type of traffic from which the remaining packet data transport channel is occupied, for example ATM or LAN / Ethernet, is determined by the connection configuration, in particular by the packet data protocol that can be edited by the subscriber-side protocol evaluation device.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur teilnehmerseitigen Informationsübertragung anzugeben, das eine flexiblere Nutzung von Anschlußleitungsnetzen ermöglicht.The invention is based on the object of specifying a method for subscriber-side information transmission which enables a more flexible use of connecting line networks.
In einem Verfahren zur teilnehmerseitigen Informationsübertragung in einem Anschlußleitungsnetz mit Hilfe eines in gleich große Zeitschlitze aufgeteilten Informationstransport- rahmens, wobei mindestens ein Teil dieser Zeitschlitze Nutz- kanal-Zeitschlitze sind, von denen jeder entweder mit Ver- mittlungssystem-Daten oder mit Paketdaten belegt wird und alle nicht mit Vermittlungssystem-Daten belegten Nutzkanal- Zeitschlitze zu einem verbleibenden Paketdaten-Transportkanal zusammengefaßt werden, löst die Erfindung diese Aufgabe dadurch, daß in jeden Zeitschlitz des verbleibenden Paketdaten- Transportkanals ein Protokolldiskriminator eingefügt wird. Dieser Protokolldiskriminator ermöglicht ein eindeutiges Zuordnen der in einem Zeitschlitz des verbleibenden Paketdaten-Transportkanals enthaltenen Daten zu einem Verkehrstyp, so daß jeweils eine verkehrstypspezifischen Protokollauswertung vorgenommen werden kann.In a method for subscriber-side information transmission in a connection line network with the aid of an information transport frame divided into equally large time slots, at least some of these time slots being user channel time slots, each of which is occupied either with switching system data or with packet data, and If all of the user channel time slots not occupied by switching system data are combined to form a remaining packet data transport channel, the invention solves this problem in that each time slot of the remaining packet data Transport channel a protocol discriminator is inserted. This protocol discriminator enables the data contained in a time slot of the remaining packet data transport channel to be uniquely assigned to a traffic type, so that a traffic-type-specific protocol evaluation can be carried out in each case.
Das Erfindungsgemäße Verfahren ermöglicht somit die Nutzung des verbleibenden Paketdaten-Transportkanals, der nachfolgend auch ISC-Kanal (vom englischsprachigen Ausdruck Idle SlotThe method according to the invention thus makes it possible to use the remaining packet data transport channel, which subsequently also is the ISC channel (from the English term idle slot
Concatenation) genannt wird, durch unterschiedliche Verkehrs- typen, wie zum Beispiel ATM und LAN.Concatenation) is called, by different types of traffic, such as ATM and LAN.
Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.Advantageous refinements are specified in the subclaims.
So sieht eine Weiterbildung eines erfindungsgemäßen Verfahrens vor, daß zur Übertragung von Nachrichten variabler Länge im verbleibenden Paketdaten-Transportkanal jeder Nachricht eine Information über ihre Länge vorangestellt wird. Bei ATM-A further development of a method according to the invention provides that for the transmission of messages of variable length in the remaining packet data transport channel, each message is preceded by its length. With ATM
Zellen ist nämlich die Länge einer Nachricht jeweils durch die konstante Länge einer ATM-Zelle vorgegeben, so daß der Protokolldiskriminator genügt, um empfängerseitig die Länge jeder Nachricht zu kennen. Bei Nachrichten variabler Länge, z.B. 16 Bit-Wort, kann folglich bei der genannten Weiterbildung der Erfindung zusätzlich zum in jede Zelle eingefügten Protokolldiskriminator eine pro Nachricht eingefügte Längenangabe übermittelt wird.Cells the length of a message is in each case predetermined by the constant length of an ATM cell, so that the protocol discriminator suffices to know the length of each message on the receiver side. For messages of variable length, e.g. 16 bit word, consequently, in the development of the invention mentioned, in addition to the protocol discriminator inserted into each cell, a length specification inserted per message can be transmitted.
Eine andere Weiterbildung eines erfindungsgemäßen Verfahrens sieht zur Übertragung von Nachrichten variabler Länge vor, im verbleibenden Paketdaten-Transportkanal zwischen zwei Nachrichten jeweils einen Zeitschlitz des verbleibenden Paketdaten-Transportkanals nicht zu belegen.Another development of a method according to the invention provides for the transmission of messages of variable length not to occupy a time slot of the remaining packet data transport channel in the remaining packet data transport channel between two messages.
Wenn die Zeitschlitze des Informationstransportrahmens in einer Weiterbildung eines erfindungsgemäßen Verfahrens je- weils einem 64 kBit/s-Kanal entsprechen, ist die verlustarme Übertragung von Informationen eines ISDN-Basisanschlusses möglich, der zwei Nutzinformationskanäle mit je 64 kBit/s Übertragungskapazität und einen Signalisierungskanal mit 16 kBit/s Übertragungskapazität hat.If the time slots of the information transport frame in a further development of a method according to the invention Because it corresponds to a 64 kbit / s channel, the low-loss transmission of information from an ISDN basic access is possible, which has two useful information channels with 64 kbit / s transmission capacity and a signaling channel with 16 kbit / s transmission capacity.
Eine besonders günstige Weiterbildung eines erfindungsgemäßen Verfahrens ergibt sich, wenn die Dauer eines Informations- transportrahmens jeweils 0,125 Millisekunden ist. Dadurch entspricht die Struktur eines erfindungsgemäßen Informations- transportrahmens einer modifizierten Version eines standardisierten ISDN-Primärraten-Anschlusses .A particularly favorable further development of a method according to the invention results if the duration of an information transport frame is 0.125 milliseconds in each case. As a result, the structure of an information transport frame according to the invention corresponds to a modified version of a standardized ISDN primary rate connection.
Vorzugsweise liegt die Anzahl der Zeitschlitze eines Informa- tionstransportrahmens abhängig von der Bitrate eines Übertra- gungssystems, in dem das Verfahren angewendet wird, zwischen 5 und 32.The number of time slots of an information transport frame is preferably between 5 and 32, depending on the bit rate of a transmission system in which the method is used.
Eine günstige Ausgestaltung eines erfindungsgemäßen Verfah- rens zur teilnehmerseitigen Informationsübertragung sieht vor, daß ein Zeitschlitz des Informationstransportrahmens zur Rahmensteuerung verwendet wird und ein Zeitschlitz zur ISDN- Signalisierung. Vorzugsweise sind diese zur Übertragung von Steuerinformation vorgesehenen Zeitschlitze innerhalb des Informationstransportrahmens an fest definierten Stellen angeordnet. Der zur Rahmensteuerung verwendete Zeitschlitz ist vorzugsweise am Anfang eines Informationstransportrahmens vorgesehen, um eine einfache Synchronisation zu ermöglichen.A favorable embodiment of a method according to the invention for subscriber-side information transmission provides that a time slot of the information transport frame is used for frame control and a time slot for ISDN signaling. These time slots provided for the transmission of control information are preferably arranged at fixedly defined locations within the information transport frame. The time slot used for frame control is preferably provided at the beginning of an information transport frame in order to enable simple synchronization.
Falls der Informationstransportrahmen in eine geradzahlige Anzahl von Zeitschlitzen aufgeteilt ist, wird die Synchronisation zusätzlich erleichtert, wenn der Zeitabstand zwischen dem zur Rahmensteuerung verwendeten Zeitschlitz und dem zur ISDN-Signalisierung verwendeten Zeitschlitz eines Informa- tionstransportrahmens gleich groß ist wie der Zeitabstand zwischen diesem zur ISDN-Signalisierung verwendeten Zeit- schlitz und dem zur Rahmensteuerung verwendeten Zeitschlitz des nachfolgenden Informationstransportrahmens .If the information transport frame is divided into an even number of time slots, synchronization is additionally facilitated if the time interval between the time slot used for frame control and the time slot used for ISDN signaling of an information transport frame is the same as the time interval between it and the ISDN Signaling used time slot and the time slot used for frame control of the subsequent information transport frame.
Nachfolgend wird die Erfindung unter Bezugnahme auf die Figu- ren an Hand eines Ausführungsbeispiels erläutert.The invention is explained below with reference to the figures using an exemplary embodiment.
Figur 1 zeigt ein Ausführungsbeispiel eines Informationstransportrahmens sowie das Umsetzen der Information einer ATM-Zelle in den ISC-Kanal dieses Informa- tionstransportrahmens; undFIG. 1 shows an exemplary embodiment of an information transport frame and the conversion of the information from an ATM cell into the ISC channel of this information transport frame; and
Figur 2 zeigt in schematischer Blockdarstellung ein Ausfuhrungsbeispiel eines Anschlußleitungsnetzes zum Anschließen einer Teilnehmereinheit an ein ISDN-Netz, ein ATM-Netz und ein LAN-Netz .Figure 2 shows a schematic block diagram of an exemplary embodiment of a connecting line network for connecting a subscriber unit to an ISDN network, an ATM network and a LAN network.
Figur 1 zeigt als Ausführungsbeispiel einen Informations- transportrahmen mit 20 gleich großen Zeitschlitzen, von denen der erste Zeitschlitz Sync OAM zur Rahmensteuerung vorgesehen ist und der elfte Zeitschlitz ISDN Signal zur ISDN-Signalisierung vorgesehen ist. Die Verwendung des ersten und des elften Zeitschlitzes zur Übertragung dieser Steuerinformation ist hierbei fest vorgegeben. Die übrigen Zeitschlitze 2 bis 10 und 12 bis 20 sind prinzipiell frei mit Vermittlungssy- stem-Daten oder Paketdaten belegbar. Im dargestellten Beispiel sind die Zeitschlitze 3, 6, 7, 9, 12, 15, 17, 18 und 20 mit Vermittlungssystem-Daten in Form von ISDN-Nutzkanalinformation belegt. ISDN-Nutzkanalinformation kann hierbei beispielsweise Faksimile-Information oder Sprachinformation sein. Die verbleibenden Nutzkanalzeitschlitze, nämlich die1 shows an exemplary embodiment of an information transport frame with 20 time slots of equal size, of which the first time slot Sync OAM is provided for frame control and the eleventh time slot ISDN signal is provided for ISDN signaling. The use of the first and the eleventh time slot for the transmission of this control information is fixed here. The remaining time slots 2 to 10 and 12 to 20 can in principle be freely assigned with switching system data or packet data. In the example shown, time slots 3, 6, 7, 9, 12, 15, 17, 18 and 20 are occupied with switching system data in the form of ISDN user channel information. ISDN payload channel information can be, for example, facsimile information or voice information. The remaining useful channel time slots, namely the
Zeitschlitze 2, 4, 5, 8, 10, 13, 14, 16 und 19 bilden gemeinsam einen ISC-Kanal zur Übertragung von Paketdaten.Time slots 2, 4, 5, 8, 10, 13, 14, 16 and 19 together form an ISC channel for the transmission of packet data.
Eine in Figur 1 dargestellte ATM-Zelle ATM wird im gezeigten Ausfuhrungsbeispiel im ISC-Kanal des Informationstransport- rahmens übertragen. Wie in Figur 1 dargestellt ist, wird hierzu die in der ATM-Zelle ATM enthaltene Information in Informationsteile 1, 2, 3, 4 aufgeteilt, wobei jeder Informa¬ tionsteil 1, 2, 3, 4 kleiner ist, als die von einem Zeitschlitz des Informationstransportrahmens aufneh bare Informationsmenge PS. Jeder der Informationsteile 1, 2, 3, 4 der ATM-Zellen-Information wird ein Protokolldiskriminator PD hinzugefügt, der in der Darstellung gemäß Figur 1 jeweils auf der linken Seite, das bedeutet am Anfang der Information PS für einen Zeitschlitz angeordnet ist.In the exemplary embodiment shown, an ATM cell ATM shown in FIG. 1 is transmitted in the ISC channel of the information transport frame. As shown in FIG. 1, the information contained in the ATM cell ATM is shown in Divided information parts 1, 2, 3, 4, each Informa tion ¬ part 1, 2, 3, 4 is smaller than that of a time slot of the information transport frame Transd bare amount of information PS. A protocol discriminator PD is added to each of the pieces of information 1, 2, 3, 4 of the ATM cell information. In the illustration according to FIG. 1, this is arranged on the left side, that is to say at the beginning of the information PS, for a time slot.
In Figur 1 ist nur das Umsetzen von vier Informationsteilen 1, 2, 3, 4 der ATM-Zellen- Information dargestellt. Die restliche ATM-Zellen-Information wird in analoger Weise in weitere Zeitschlitze des ISC-Kanales eingepackt.In Figure 1, only the implementation of four pieces of information 1, 2, 3, 4 of the ATM cell information is shown. The remaining ATM cell information is packed in an analog manner into further time slots of the ISC channel.
Figur 2 zeigt in schematischer Blockdarstellung ein Anschlußleitungsnetz AN mit einem Vermittlungsknoten CPN zum Durch- schalten von Vermittlungssystemdaten und Paketdaten zu einer Teilnehmeranschlußleitung und im dargestellten Ausführungsbeispiel somit zum Anschließen einer Teilnehmeranschlußein- heit SSU (Subscriber Unit) an ein ISDN-Netz ISDN-NET, an ein ATM-Netz ATM-NET und an ein lokales Datennetz LAN.FIG. 2 shows a schematic block diagram of a connecting line network AN with a switching node CPN for switching through switching system data and packet data to a subscriber connecting line and thus in the exemplary embodiment shown for connecting a subscriber line unit SSU (subscriber unit) to an ISDN network ISDN-NET an ATM network ATM-NET and to a local data network LAN.
Die teilnehmerseitige Informationsübertragung, also die Informationsübertragung zwischen Teilnehmereinheit SSU und dem Anschlußleitungsnetz AN erfolgt in dem Ausführungsbeispiel gemäß den Figuren 1 und 2 mit Hilfe von Informationstransportrahmen gemäß Figur 1. Dabei wird der erste Zeitschlitz eines Informationstransportrahmens jeweils zum Übertragen der Rahmen-Steuerinformation Sync OAM verwendet und der elfte Zeitschlitz eines Informationstransportrahmens wird zur Übertragung der ISDN-Signalisierungsinformation zwischen der Teilnehmereinheit SSU und dem ISDN-Netz ISDN-NET verwendet.The subscriber-side information transmission, that is to say the information transmission between subscriber unit SSU and the connecting line network AN takes place in the exemplary embodiment according to FIGS. 1 and 2 with the aid of information transport frames according to FIG. 1. The first time slot of an information transport frame is used in each case for transmitting the frame control information Sync OAM and the eleventh time slot of an information transport frame is used to transmit the ISDN signaling information between the subscriber unit SSU and the ISDN network ISDN-NET.
Ein Teil der Zeitschlitze eines Informationstransportrahmens wird zur Übertragung von ISDN-Nutzinformation zwischen der Teilnehmereinheit SSU und dem ISDN-Netz ISDN-NET verwendet. Die verbleibenden Zeitschlitze eines Informationstransport- rahmens bilden gemeinsam einen ISC-Kanal und dienen entweder der Informationsübertragung zwischen der Teilnehmereinheit SSU und dem lokalen Datennetz LAN oder zwischen der Teilnehmereinheit SSU und dem ATM-Νetz ATM-ΝET. Die Art der in den Zeitschlitzen des ISC-Kanals übertragenen Information, also der Verkehrstyp, wird in jedem Zeitschlitz PS durch einen Protokolldiskriminator PD gekennzeichnet.Part of the time slots of an information transport frame is used for the transmission of ISDN user information between the subscriber unit SSU and the ISDN network ISDN-NET. The remaining time slots of an information transport frames together form an ISC channel and either serve to transmit information between the subscriber unit SSU and the local data network LAN or between the subscriber unit SSU and the ATM network -ET. The type of information transmitted in the time slots of the ISC channel, that is to say the type of traffic, is identified in each time slot PS by a protocol discriminator PD.
Im Ausfuhrungsbeispiel gemäß Figur 1 wird in jedem Zeit- schlitz des Paketdatentransportkanals ein Teil 1, 2, 3, 4 einer ATM-Zelle ATM übertragen, so daß der Protokolldiskriminator PD jeweils die Information "ATM" enthält.In the exemplary embodiment according to FIG. 1, part 1, 2, 3, 4 of an ATM cell ATM is transmitted in each time slot of the packet data transport channel, so that the protocol discriminator PD in each case contains the information “ATM”.
Da die ATM-Zelle eine konstante Länge hat, können die Zeit- schlitze mit der Paktedateninformation PS empfängerseitig, also entweder im Anschlußleitungsnetz AN oder in der Teilnehmereinheit SSU (abhängig von der Übertragungsrichtung) gesammelt und zusammengesetzt werden. Die somit zusammengesetzte ATM-Zelle kann dann entweder auf der Teilnehmerseite verar- beitet oder von dem Anschlußleitungsnetz AN zum ATM-Netz ATMNET weitergeleitet werden.Since the ATM cell has a constant length, the time slots with the packet data information PS can be collected and assembled on the receiver side, that is to say either in the line network AN or in the subscriber unit SSU (depending on the direction of transmission). The ATM cell thus composed can then either be processed on the subscriber side or forwarded from the access line network AN to the ATM network ATMNET.
Zur Übertragung von Information zwischen dem lokalen Datennetz LAN und der Teilnehmereinheit SSU muß der (nicht darge- stellte) Protokolldiskriminator jedes Zeitschlitzes des ISC- Kanals entsprechend die Information LAN enthalten, so daß ein entsprechendes Bearbeiten oder Weiterleiten der Information vorgenommen werden kann. To transmit information between the local data network LAN and the subscriber unit SSU, the protocol discriminator (not shown) of each time slot of the ISC channel must contain the information LAN accordingly, so that the information can be processed or forwarded accordingly.

Claims

Patentansprüche claims
1. Verfahren zur teilnehmerseitigen Informationsübertragung in einem Anschlußleitungsnetz (AN) mit Hilfe eines in gleich große Zeitschlitze aufgeteilten Informationstransportrahmens, wobei mindestens ein Teil dieser Zeitschlitze Nutzkanal-Zeitschlitze sind, von denen jeder entweder mit Vermittlungssystem-Daten (ISDN) oder mit Paketdaten (PS) belegt wird und alle nicht mit Vermitt- lungssystem-Daten (ISDN) belegten Nutzkanal-Zeitschlitze zu einem verbleibenden Paketdaten-Transportkanal zusammengefaßt werden, dadurch gekennzeichnet, daß in jeden Zeitschlitz des verbleibenden Paketdaten-Transportkanals ein Protokolldiskriminator (PD) eingefügt wird, der ein eindeutiges Zuordnen der in einem Zeitschlitz des verbleibenden Paketdaten-Transportkanals enthaltenen Daten zu einem Verkehrstyp ermöglicht.1. Method for subscriber-side information transmission in a connecting line network (AN) with the aid of an information transport frame divided into equally large time slots, at least some of these time slots being useful channel time slots, each of which either with switching system data (ISDN) or with packet data (PS) is occupied and all user channel time slots not occupied by switching system data (ISDN) are combined to form a remaining packet data transport channel, characterized in that a protocol discriminator (PD) is inserted into each time slot of the remaining packet data transport channel, which has a unique Allocation of the data contained in a time slot of the remaining packet data transport channel to a traffic type is made possible.
2. Verfahren zur teilnehmerseitigen Informationsübertragung nach Anspruch 1, dadurch gekennzeichnet, daß zur Übertragung von Nachrichten variabler Länge im verbleibenden Paketdaten-Transportkanal jeder Nachricht eine Information über ihre Länge vorangestellt wird.2. A method for subscriber-side information transmission according to claim 1, characterized in that for the transmission of messages of variable length in the remaining packet data transport channel, each message is preceded by information about its length.
3. Verfahren zur teilnehmerseitigen Informationsübertragung nach Anspruch 1, dadurch gekennzeichnet, daß zur Übertragung von Nachrichten variabler Länge im verbleibenden Paketdaten-Transportkanal zwischen zwei Nachrichten jeweils ein Zeitschlitz des verbleibenden Paketdaten-Transportka- nals unbelegt bleibt.3. The method for subscriber-side information transmission according to claim 1, characterized in that for the transmission of messages of variable length in the remaining packet data transport channel between two messages, a time slot of the remaining packet data transport channel remains unoccupied.
4. Verfahren zur teilnehmerseitigen Informationsübertragung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Zeitschlitze des Informationstransportrahmens jeweils einem 64 kBit/s-Kanal entspricht. 4. A method for subscriber-side information transmission according to claim 1, 2 or 3, characterized in that the time slots of the information transport frame each correspond to a 64 kbit / s channel.
5. Verfahren zur teilnehmerseitigen Informationsübertragung nach Anspruch 4, dadurch gekennzeichnet, daß die Dauer eines Informationstransportrahmens jeweils 0,125 Millisekunden ist.5. A method for subscriber-side information transmission according to claim 4, characterized in that the duration of an information transport frame is in each case 0.125 milliseconds.
6. Verfahren zur teilnehmerseitigen Informationsübertragung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Anzahl der Zeitschlitze eines Informationstransportrahmens abhängig von der Bitrate eines Übertra- gungssystems, in dem das Verfahren angewendet wird, zwischen 5 und 32 liegt.6. A method for subscriber-side information transmission according to one of the preceding claims, characterized in that the number of time slots of an information transport frame is between 5 and 32 depending on the bit rate of a transmission system in which the method is used.
7. Verfahren zur teilnehmerseitigen Informationsübertragung nach einem der vorherigen Ansprüche, dadurch gekennzeich- net, daß ein Zeitschlitz (Sync OAM) des Informationstransportrahmens zur Rahmensteuerung verwendet wird.7. The method for subscriber-side information transmission according to one of the preceding claims, characterized in that a time slot (sync OAM) of the information transport frame is used for frame control.
8. Verfahren zur teilnehmerseitigen Informationsübertragung nach einem der vorherigen Ansprüche, dadurch gekennzeich- net, daß ein Zeitschlitz (ISDN Signal) des Informationstransportrahmens zur ISDN-Signalisierung verwendet wird. 8. The method for subscriber-side information transmission according to one of the preceding claims, characterized in that a time slot (ISDN signal) of the information transport frame is used for ISDN signaling.
EP98928063A 1997-04-18 1998-03-24 Method for subscriber information transfer in a local line distribution network Withdrawn EP0976298A1 (en)

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