WO2000011907A2 - Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm - Google Patents

Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm Download PDF

Info

Publication number
WO2000011907A2
WO2000011907A2 PCT/DE1999/002649 DE9902649W WO0011907A2 WO 2000011907 A2 WO2000011907 A2 WO 2000011907A2 DE 9902649 W DE9902649 W DE 9902649W WO 0011907 A2 WO0011907 A2 WO 0011907A2
Authority
WO
WIPO (PCT)
Prior art keywords
atm
virtual connections
cells
stream
vc1n
Prior art date
Application number
PCT/DE1999/002649
Other languages
German (de)
English (en)
Other versions
WO2000011907A3 (fr
Inventor
Peter Rau
Siegfried Huber
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP99953583A priority Critical patent/EP1108344A2/fr
Priority to CA002341562A priority patent/CA2341562A1/fr
Publication of WO2000011907A2 publication Critical patent/WO2000011907A2/fr
Publication of WO2000011907A3 publication Critical patent/WO2000011907A3/fr

Links

Classifications

    • 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
    • H04L2012/5619—Network Node Interface, e.g. tandem connections, transit switching
    • 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
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/565—Sequence integrity
    • 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
    • H04L2012/5674—Synchronisation, timing recovery or alignment
    • 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
    • H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
    • H04L2012/568—Load balancing, smoothing or shaping

Definitions

  • the transmitted digital or digitized information represents, for example, voice, text, data, characters, graphics, still or moving images. This information is also referred to in the professional world as useful information.
  • m Europe leased lines are used in accordance with the plesiochronous digital hierarchy PDH, the transmission capacities of e.g. 64 Kbit / s, 2 Mbit / s, 34 Mbit / s and 140 Mbit / s.
  • leased lines are provided for this purpose, for example in accordance with the hierarchy levels DS1 and DS3 with transmission capacities of 1.5 Mbit / s or 45 Mbit / s or in accordance with the synchronous optical network SONET, e.g. 51.84 Mbit / s.
  • leased lines are usually implemented according to the synchronous digital hierarchy SDH, which e.g. Provides transmission capacities of 155 Mbit / s, 622 Mbit / s or 2.5 Gbit / s; The same hierarchy levels are available in the US SONET m from 155 Mbit / s.
  • the transmission capacity of the leased lines required for the implementation of a virtual private network and usually leased from a network operator depends on the amount of information to be transmitted. Due to the relatively large differences between the transmission capacities of the hierarchy levels, an optimal coordination between see the benot costumen and provided felicitska ⁇ often not possible capacity.
  • ATM-based fixed connections can - so-called “virtual Verbin ⁇ compounds” or “permanent virtual connections' - tet be emgerich- over which a problematicubertragung with so-called ⁇ " ATM cells "is carried out, the tuples of a five-Oc- each comprehensive, serving for control and a 48 octet, for information transfer serving information.
  • the transmission capacity of a virtual connection is freely selectable - i.e. regardless of the hierarchy levels of PDH, SONET or SDH technology - whereby due to the switching of a virtual connection from the switching equipment of an ATM network to a physical connection, the maximum transmission capacity of a virtual connection is limited to the maximum transmission capacity of the transmission technology based on the physical connections of the communication network and with the help of which the virtual connections are transmitted.
  • the core area of the network is usually first switched to ATM technology, while SDH technology continues to be used in the periphery of the network.
  • the previously SDH-oriented leased lines must be implemented with the help of virtual connections. This is usually done by embedding the continuous bit stream of an SDH-oriented fixed connection in the information parts of the ATM cells of a virtual connection - the continuous bit stream is converted into an ATM-oriented cell stream.
  • This technique is m referred to by experts as "transparent" transmission or as Circuit Emulation Service CES.
  • a known method for this is described in the ITU-T standard 1.363.1, which is known to the person skilled in the art as ATM adaptation layer 1, also AAL-1.
  • the bit rate of the ATM-oriented cell stream increases compared to the bit rate of the continuous bit stream of an SDH-oriented leased line. For example, if the continuous bit stream of an SDH leased line has a bit rate of 622 Mbit / s, the bit stream after conversion m an ATM-oriented cell stream has at least a bit rate of 687 Mbit / s. A further increase in this bit rate occurs when the AAL-1 method is used, since with this method at least one octet of further control information is transmitted in the information part of the ATM cells, which increases the bit rate of the ATM-oriented cell stream to at least 701 Mbit / s.
  • the transmission technology used on the physical connections of the communication network is limited, for example, to a maximum transmission capacity of 622 Mbit / s, the problem arises that the ATM-oriented cell stream cannot be transmitted with a virtual connection, since the Transmission capacity of the transmission technology on the physical connections is not sufficient.
  • European patent application EP 0 576 856 A3 discloses a method in which a continuous bit stream, which requires a higher transmission capacity than the virtual connections in an ATM communication network, is distributed over at least two virtual connections.
  • the continuous bit stream is subdivided into m bit groups which, in terms of their number of bits plus a fixed number of control bits, correspond to the number of m bits which the information part of an ATM cell can transmit as user information - the continuous bit stream is converted into an ATM-oriented cell stream.
  • at least two bit groups are taken from the continuous bit stream and the information part of ATM cells is inserted by adding a continuously changing bit group sequence number m.
  • European patent 0584398 discloses a method in which an ATM-oriented cell stream is described via at least two virtual connections with further development of the European patent application EP 0 576 856 A3 Procedure takes place.
  • the double transfer of cell head is avoided by performing a depacketing of m the con ⁇ tinuous bit stream contained ATM cell stream before division m bit groups. This requires increased control effort.
  • the division of the continuous bit stream m bit groups which is always provided in the European patent application EP 0 576 856 A3, is carried out unchanged.
  • the invention is therefore based on the object of improving the transmission of an ATM-oriented cell stream in an ATM communication network via at least two virtual connections.
  • the essential aspect of the invention can be seen in the fact that an ATM-oriented cell stream is transmitted via an ATM communication network in which at least two virtual connections are provided in the ATM communication network in which the ATM-oriented cell stream is distributed over the at least two virtual connections. and in which at least temporarily synchronization cells m the virtual connections are inserted regularly.
  • An essential advantage of the method according to the invention is that the information parts of the cells of the ATM-oriented cell stream are fed unchanged to the virtual connections. The information parts can thus contain any useful data.
  • Another advantage of the invention is that the synchronization time can be used to determine the runtime differences of the ATM cells transmitted via the virtual connections.
  • the composition of the original ATM-oriented cell stream - ie with the original sequence of the ATM cells - can be effected.
  • the distribution advantageously achieves a load distribution of the transmission capacity required for the transmission of the ATM-oriented cell stream on the physical connections, provided that the virtual connections bmditch above sea over various physical connections ge ⁇ are leads.
  • the synchronization cells contain a sequence number - claim 3.
  • This has the advantage that when using a sufficiently large number of bits for the transmission of the sequence numbers in the information part of the synchronization cells - e.g. 32 bits - any difference in runtime can be determined. If, for example, a synchronization cell is shown after every 32 useful cells and the transmission takes place at a bit rate of 622 Mbit / s, there is a difference of approx. 1000 km between the lengths of the physical connections for a nine-bit sequence number the virtual connections are transmitted, can be determined.
  • the ATM-oriented cell stream has a transmission bit rate that is greater than the respective maximum transmission bit rates of the virtual connections. This advantageously enables the transmission of the ATM-oriented cell stream if the transmission bit rates of the virtual ones are increased Connections, for example, are not possible for technical reasons or are omitted for economic reasons.
  • a development of the inventive method is provided that, after a transmission via the virtuel ⁇ len compounds a summary m is performed len the original ATM-based cell current with the aid of Synchronisierzel- - claim 5 advantageously is thereby ensured that the order of the cells of the ATM orien ⁇ oriented cell stream after transmission over the virtual connections is restored.
  • a continuous bit stream m is converted into the ATM-oriented cell stream and transmitted with the aid of the ATM-oriented cell stream.
  • the conversion of the continuous bit stream into the ATM-oriented cell stream takes place in accordance with the ITU-T standard 1.363.1 - claim 7.
  • continuous bit streams converted in accordance with the standard can already be transmitted via the virtual connections.
  • a summary m of the original continuous bit stream is carried out with the aid of the synchronization cells - claim 8.
  • the original bit stream can be put together without prior joining of the original ATM-oriented cell stream.
  • a plurality of switching devices (VE1 - VE6) formed by physical connections - m the figure in ⁇ directly through the virtual connections (VC11 - VC1N) is indicated ⁇ - are interconnected.
  • the different routings through the ATM communication network (KN) indicate that the virtual connections (VC11 - VC1N) are routed via different physical connections.
  • VIMA1 - VIMA2 With the switching equipment (VE1 - VE6) between two composites ⁇ NEN concerns (VIMA1 - VIMA2) the virtual connections (VC11 - VC1N) are guided, wherein the first adjustment unit (VIMA1) of the distribution of an ATM-based cell current (zslO) for transmission over the virtual connections (VC11 - VC1N) and the second adaptation unit (VIMA2) serves to merge the original ATM-oriented cell stream (zs10) after the transmission over the virtual connections (VC11 - VC1N).
  • the adaptation units (VIMA1 - VIMA2) can alternatively be integrated into the switching devices (VE1 - VE6) - this is illustrated by the dashed lines of switching devices VE5 and VE6.
  • Two conversion units are provided for converting a continuous bit stream (bs) transmitted, for example, via a leased line.
  • the first (CES1) is connected to the first adaptation unit (VIMA1) and converts the continuous bit stream (bs) into an ATM-oriented cell stream (zs10), which is optionally transmitted to a further virtual connection (VC10).
  • the second (CES2) is connected to the second adaptation unit (VIMA2) and converts the ATM-oriented cell stream (zs10), which may be transmitted to the further virtual connection (VC10), the original continuous bit stream (bs).
  • the second conversion device can optionally be dispensed with , when the composition of the original conti ⁇ tinuous bit stream (bs) without the composition of the originally ⁇ union ATM-based cell current (zslO) m of the second adjustment unit (VIMA2) is carried out - this is represented by the dashed representation of the further with bs indicated arrow .
  • a continuous bit stream (bs) is fed to the first conversion unit (CES1) and an ATM-oriented cell stream (zs10) is converted by this.
  • An example of a conversion is described in the international standard 1.363.1 of the ITU-T.
  • the ATM-oriented cell stream (zs10) is now fed to the first adaptation unit (VIMA1) and from there distributed to the connected virtual connections.
  • the first connection unit (VIMA1) regularly synchronizing cells (sz) the virtual connections that are determined by a synchronization cell identifier (szk) in the header of ATM cells.
  • the insertion is, for example, when establishing the virtual connections (VC11 - V C 1N) required for the first time determination of the runtime differences. Even if the synchromate is lost, a temporary insertion of the synchronization cells (sz) is required.
  • the synchronization cells (sz) can be omitted, which increases the throughput rate of the virtual connections (VC11 - VC1N).
  • m the virtual connections (VC11 - VC1N) inserted synchronization cells (sz) m of the second adaptation unit (VIMA2) can be received so far shifted against each other - caused by very different runtimes - that no assignment of the synchronization cells (sz) to each other is possible .
  • the virtual connections (VC11 - VC1N) inserted synchronization cells (sz) can be identified with the same sequence number (sn), which allows the second adaptation unit (VIMA2) to assign the synchronization cells (sz) to each other.
  • the ATM cells are transmitted at a bit rate of 622 Mbit / s, approximately 1,666 ATM cells / ms are transmitted. If the transit time difference of the ATM cells transmitted via the virtual connections (VC11 - VC1N) is e.g.
  • Identification of the two synchronization cells (sz) therefore requires a sequence number (sn) of at least nine bits.
  • the original ATM-oriented cell stream (zs10) is now combined using the synchronization cells (sz) according to an embodiment variant of the method according to the invention.
  • a temporary storage of the received ATM cells in a memory device (SP) is required.
  • SP memory device
  • the original ATM-oriented cell stream (zs10) is now removed from the second adaptation unit (VIMA2) and fed to the second conversion unit (CES2), the original ATM-oriented cell stream (zs10) possibly being contained in the further virtual connections (VClO).
  • the second conversion unit (CES2) the original ATM-oriented cell stream (zs10) is finally converted into the original continuous bit stream (bs).
  • the original continuous bit stream (bs) is combined in the second adaptation unit (VIMA2) with the aid of the synchronization cells - i.e. bypassing a summary of the original ATM-oriented cell stream (zs10).
  • the transmitted bit stream parts are taken from the information parts of the ATM cells temporarily stored in the memory device (SP) and combined to form the original continuous bit stream (bs).

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Selon le procédé présenté, un courant cellulaire (zs10) orienté ATM, transmettant un courant de bits (bs) continu, est transmis par l'intermédiaire d'un réseau de communication ATM (KN). Dans ce réseau de communication ATM (KN) sont prévues au moins deux liaisons virtuelles (VC11-VC1N) sur lesquelles le courant cellulaire (zs10) orienté ATM est réparti, des cellules de synchronisation (sz) au moins temporaires étant insérées régulièrement dans les liaisons virtuelles (VC11-VC1N). Un courant de bits (bs) continu, à haut débit binaire, peut être ainsi transmis par l'intermédiaire de liaisons virtuelles (VC11-VC1N).
PCT/DE1999/002649 1998-08-24 1999-08-24 Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm WO2000011907A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99953583A EP1108344A2 (fr) 1998-08-24 1999-08-24 Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm
CA002341562A CA2341562A1 (fr) 1998-08-24 1999-08-24 Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19838420.3 1998-08-24
DE19838420 1998-08-24

Publications (2)

Publication Number Publication Date
WO2000011907A2 true WO2000011907A2 (fr) 2000-03-02
WO2000011907A3 WO2000011907A3 (fr) 2000-05-18

Family

ID=7878540

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/002649 WO2000011907A2 (fr) 1998-08-24 1999-08-24 Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm

Country Status (3)

Country Link
EP (1) EP1108344A2 (fr)
CA (1) CA2341562A1 (fr)
WO (1) WO2000011907A2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5317561A (en) * 1991-05-07 1994-05-31 Siemens Aktiengesellschaft Method for switching ATM message cell streams having a high bit rate via a switching equipment having a lower bit rate
US5608733A (en) * 1994-11-29 1997-03-04 Valle; Richard ATM inverse multiplexing
EP0818941A2 (fr) * 1996-07-13 1998-01-14 Gpt Limited Liaisons de communication pour la transmission de données dans des paquets de longueur fixe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5317561A (en) * 1991-05-07 1994-05-31 Siemens Aktiengesellschaft Method for switching ATM message cell streams having a high bit rate via a switching equipment having a lower bit rate
US5608733A (en) * 1994-11-29 1997-03-04 Valle; Richard ATM inverse multiplexing
EP0818941A2 (fr) * 1996-07-13 1998-01-14 Gpt Limited Liaisons de communication pour la transmission de données dans des paquets de longueur fixe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PLOTKIN N T ET AL: "PERFORMANCE ANALYSIS OF PARALLEL ATM CONNECTIONS FOR GIGABIT SPEED APPLICATIONS" PROCEEDINGS OF THE ANNUAL JOINT CONFERENCE OF THE COMPUTER AND COMMUNICATIONS SOCIETIES (INFOCOM),US,LOS ALAMITOS, IEEE COMP. SOC. PRESS, Bd. CONF. 12, 1993, Seiten 1186-1193, XP000419682 ISBN: 0-8186-3580-0 *

Also Published As

Publication number Publication date
CA2341562A1 (fr) 2000-03-02
WO2000011907A3 (fr) 2000-05-18
EP1108344A2 (fr) 2001-06-20

Similar Documents

Publication Publication Date Title
DE69735788T2 (de) Schnurloses ATM-Kommunikationssystem mit Weiterreichen und Betriebsverfahren
DE69812375T2 (de) Nach dem verbindungslosen prinzip arbeitendes kommunikationsnetzwerk
DE68928517T2 (de) Ringkommunikationssystem
DE69817540T2 (de) Vermittlung in atm anpassungsschicht
DE69310762T2 (de) Herstellung von fernmeldeanrufwegen in breitbandkommunikationsnetzen
EP0528087A1 (fr) Procédé et agencement pour la communication des informations STM à travers des commutateurs ATM
DE19740107A1 (de) Verfahren zum Übertragen von Datenpaketen und zur Durchführung des Verfahrens geeignetes Netzelement
DE69636242T2 (de) Verfahren und vorrichtung zur mehrfachzellenübertragung
DE69720687T2 (de) Telekommunikationssystem
EP0762694A1 (fr) Réseau local à Mode de Transfert Asynchrome (ATM) avec au moins deux systèmes en anneau
DE69936840T2 (de) Mobilübertragungssystem mit einer atm-verbindungskonfiguration
DE69132754T2 (de) Paketvermittlungssystem mit selbstsuchenden Vermittlungen
DE19708182C2 (de) System zur leitungsungebundenen Übertragung eines rahmensynchronisierten Signals zwischen einer Feststation und wenigstens einem mobilen Terminal
DE69824549T2 (de) Atm-kommunikationssystem und -verfahren
DE69901170T2 (de) Verfahren zur Erzeugung von ATM Zellen für Anwendungen mit niedriger Bitrate
DE10023037A1 (de) Koppelfeld für ein Fernmeldenetz und Verfahren zur Vermittlung in einem Koppelfeld
DE4232652A1 (de) Verfahren zur zuteilung von vermittlungstechnischen ressourcen in einem im asynchron-transfer-modus wirkenden kommunikationssystem
DE69838965T2 (de) Paketvermittlungsnetzwerk, Paketvermittlungseinrichtung und Netzwerkmanagementeinrichtung
EP1108344A2 (fr) Procede de transmission d'un courant cellulaire oriente atm par l'intermediaire d'au moins deux liaisons virtuelles d'un reseau de communication atm
DE69930569T2 (de) Bearbeitungsgerät zum Diversity-Handover sowie Netzsteuerungssystem, welches dieses Gerät verwendet
DE19532421C1 (de) Lokales, nach dem asynchronen Transfermodus (ATM) arbeitendes Netzwerk zur Erzeugung von priorisierten Zellen
DE19850641B4 (de) Kommunikationssystem, mit über ein paket-orientiertes Kommunikationsnetz mit einer Kommunikationsanlage in Verbindung stehenden Kommunikationsendgeräten
DE19832999C2 (de) Verfahren zum Vermitteln von über eine paket-orientierte Datenübertragungsstrecke empfangenen Daten
DE69909988T2 (de) Verfahren zur Erzeugung von ATM Zellen für Anwendungen mit niedriger Bitrate
DE69411293T2 (de) Verfahren zur Reservierung von Bitraten in einem ATM-Netz

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): CA US

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
AK Designated states

Kind code of ref document: A3

Designated state(s): CA US

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

WWE Wipo information: entry into national phase

Ref document number: 1999953583

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2341562

Country of ref document: CA

Ref country code: CA

Ref document number: 2341562

Kind code of ref document: A

Format of ref document f/p: F

WWE Wipo information: entry into national phase

Ref document number: 09763444

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 1999953583

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1999953583

Country of ref document: EP