EP1188268A1 - Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets - Google Patents

Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets

Info

Publication number
EP1188268A1
EP1188268A1 EP00935175A EP00935175A EP1188268A1 EP 1188268 A1 EP1188268 A1 EP 1188268A1 EP 00935175 A EP00935175 A EP 00935175A EP 00935175 A EP00935175 A EP 00935175A EP 1188268 A1 EP1188268 A1 EP 1188268A1
Authority
EP
European Patent Office
Prior art keywords
transmission
packet
information
test information
bit
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Withdrawn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
EP00935175A
Other languages
German (de)
English (en)
Inventor
Joachim Charzinski
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
Priority to EP00935175A priority Critical patent/EP1188268A1/fr
Publication of EP1188268A1 publication Critical patent/EP1188268A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H04L1/24—Testing correct operation
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • IP packets Internet Protocol
  • Each packet is provided with a checksum to identify transmission errors.
  • bit errors can be determined at the receiving end.
  • the checksum is calculated, for example, using all information transmitted between two reference points.
  • two switching nodes can function as reference points, between which a transmission section formed from a plurality of partial sections is arranged.
  • the subsections are formed by regenerators arranged on the transmission section.
  • the checksum is calculated independently of one another both in the transmitting and in the receiving switching node.
  • a CRC calculation is carried out on the transmission side, which is passed on to the packet to be transmitted.
  • this also transmitted checksum is evaluated and compared with the calculation of a further checksum formed from the information received. If there is a difference from this comparison, the received packet is discarded.
  • the invention is based on the object of demonstrating a way in which more efficient monitoring of the physical transmission quality can be carried out in sections, even in connectionless switching.
  • An advantage of the invention is in particular that it is possible to capture the bit errors that occurred during the transmission process in sections, while the checksum method used in the prior art only allows an end-to-end statement.
  • a second piece of test information is formed in a sending regenerator via this and possibly further information of the packet to be sent out in accordance with an algorithm, which is also given to the packet and is only evaluated in the receiving regenerator, and which is compared with a piece of test information formed here using the same further algorithm becomes.
  • FIG. 1 switching nodes which terminate a transmission section
  • FIG. 2 shows the frame structure into which IP packets are inserted during transmission
  • FIG. 1 shows a configuration on which the method according to the invention is carried out. Accordingly, two switching nodes R A , RB are shown, which terminate a transmission section UA. A plurality of regenerators RG ⁇ ... RG n are arranged in the transmission section UA between the switching nodes R A , R B. Two of these regenerators each terminate subsections TA, with which the whole
  • Transmission section UA is formed from these subsections TA.
  • the switching nodes R A , R B should be designed as an IP router.
  • IP packets are routed via the transmission section UA using the WDM (Wave Division Multiplexing) transmission method.
  • the sending switching node is the IP router R A and the receiving switching node is the IP router R B.
  • the sending IP router R A transmits IP packets of different lengths to the receiving IP router R B via the transmission section UA.
  • the transmission section UA is bidirectional, but for better understanding only the transmission from the sending IP router R A to the receiving IP router R B is shown.
  • FIG. 2 shows how the IP packets are sent via the transmission section UA.
  • an IP packet in the IP router R A is integrated into a frame structure R (encapsulation).
  • the IP packet is inserted into a payload packet field NP. This is preceded by a frame head RK.
  • Information about eg the beginning of the frame and the length of the frame is stored there.
  • a field for error detection FE is also provided, in which the result of checksum calculations is stored.
  • CRC test sequences can be used as checksum calculations. These test sequences are generated in the IP router R A and evaluated in the IP router R B (end-to-end). In this way, a statement can be made about the transmission quality of the entire transmission section UA ' arranged between the IP router R A and the IP router R B , and faulty packets can be recognized and discarded.
  • a parity field PM is now additionally provided, in which parity bits P are transmitted.
  • the parity bits P are determined, for example, according to the BIP calculation method (bit interleaved parity) in the sending regenerator and fed to the regenerator arranged on the receiving side via the relevant section TA in the parity field PM.
  • the parity bits P are transmitted with each user data frame in the parity field PM and are either within the frame R only on the payload package NP, on the payload package NP together with the checksum FE, or on the payload package NP together with the checksum FE and the frame header RK calculated. If the width of the parity field PM is 1 bit, a simple parity bit can be used for the calculation.
  • the parity bits P are evaluated and compared with an own parity evaluation carried out here. In accordance with the result, the parity bit P is reset and entered in the parity field PM. Furthermore, a statistic maintained here about any transmission errors that have occurred is updated in the receiving regenerator.
  • the number of bit errors occurring on a transmission section is estimated according to the maximum likelihood method as the number of bits in which the own calculation of the parity bits P of a regenerator differs from the received parity bits different.
  • the current bit error rate is used as the quotient of the estimate for the number Bit error occurred divided by the number of bits in the transmitted frame.
  • An estimate of the bit error rate, which is sufficient for performance monitoring purposes, is obtained by averaging a number of consecutive instantaneous estimates.
  • This procedure enables a bit-by-bit bit rate estimation.
  • the segmental bit error rate estimates stored in the individual regenerators can then be read out, for example, using X.25 protocols.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

Selon l'invention, dans une commutation sans connexion, comme en représente une commutation de paquets-IP, chaque paquet est muni d'un total de contrôle pour contrôler la qualité de transmission binaire. Ce total de contrôle permet de n'effectuer, côté réception, qu'une proposition portant sur le fait qu'une erreur de transmission serait survenue sur l'ensemble de la section de transmission (de bout en bout). Une détection par section de l'erreur sur bits intervenue pendant le processus de transmission n'est toutefois pas possible. Afin de remédier à ce problème, il est prévu de constituer une autre donnée de contrôle à ajouter au paquet.
EP00935175A 1999-06-29 2000-06-06 Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets Withdrawn EP1188268A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00935175A EP1188268A1 (fr) 1999-06-29 2000-06-06 Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99112406 1999-06-29
EP99112406A EP1065823A1 (fr) 1999-06-29 1999-06-29 Procédé de surveillance de la qualité de transmission de bits dans une transmission par paquets
EP00935175A EP1188268A1 (fr) 1999-06-29 2000-06-06 Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets
PCT/EP2000/005198 WO2001003361A1 (fr) 1999-06-29 2000-06-06 Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets

Publications (1)

Publication Number Publication Date
EP1188268A1 true EP1188268A1 (fr) 2002-03-20

Family

ID=8238451

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99112406A Withdrawn EP1065823A1 (fr) 1999-06-29 1999-06-29 Procédé de surveillance de la qualité de transmission de bits dans une transmission par paquets
EP00935175A Withdrawn EP1188268A1 (fr) 1999-06-29 2000-06-06 Procede pour controler la qualite de transmission binaire dans le cadre de la transmission orientee paquets

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99112406A Withdrawn EP1065823A1 (fr) 1999-06-29 1999-06-29 Procédé de surveillance de la qualité de transmission de bits dans une transmission par paquets

Country Status (3)

Country Link
EP (2) EP1065823A1 (fr)
CA (1) CA2377966A1 (fr)
WO (1) WO2001003361A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001186061A (ja) * 1999-12-24 2001-07-06 Nec Corp 伝送品質監視システムおよび伝送品質の監視方法
US7707319B2 (en) * 2000-09-18 2010-04-27 Rockwell Automation Technologies, Inc. Noninvasive testing of network interface error codes for safety network
GB0402131D0 (en) 2004-01-30 2004-03-03 Isis Innovation Delivery method
US9220678B2 (en) 2007-12-24 2015-12-29 The University Of Queensland Coating method
WO2012006677A1 (fr) 2010-07-14 2012-01-19 The University Of Queensland Appareil d'application de timbre transdermique
EP3881781B1 (fr) 2011-10-12 2023-03-29 Vaxxas Pty Limited Dispositif de distribution
AU2016214968B2 (en) 2015-02-02 2021-02-25 Vaxxas Pty Limited Microprojection array applicator and method
US11103259B2 (en) 2015-09-18 2021-08-31 Vaxxas Pty Limited Microprojection arrays with microprojections having large surface area profiles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651944B1 (fr) * 1989-09-08 1991-10-25 Bonnifait Michel Equipements de controle de qualite pour liaisons de transmission numeriques.
FI964047A (fi) * 1996-10-09 1998-04-10 Nokia Telecommunications Oy Tiedonsiirtomenetelmä ja tukiasemajärjestelmä

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0103361A1 *

Also Published As

Publication number Publication date
EP1065823A1 (fr) 2001-01-03
CA2377966A1 (fr) 2001-01-11
WO2001003361A1 (fr) 2001-01-11

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