WO2004086702A1 - Procede permettant d'assurer la qualite de service lors de la transmission de donnees par l'intermediaire de reseaux orientes paquets - Google Patents

Procede permettant d'assurer la qualite de service lors de la transmission de donnees par l'intermediaire de reseaux orientes paquets Download PDF

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Publication number
WO2004086702A1
WO2004086702A1 PCT/EP2004/001628 EP2004001628W WO2004086702A1 WO 2004086702 A1 WO2004086702 A1 WO 2004086702A1 EP 2004001628 W EP2004001628 W EP 2004001628W WO 2004086702 A1 WO2004086702 A1 WO 2004086702A1
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WO
WIPO (PCT)
Prior art keywords
transmission
testv
quality
transmitted
packet
Prior art date
Application number
PCT/EP2004/001628
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German (de)
English (en)
Inventor
Norbert LÖBIG
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
Publication of WO2004086702A1 publication Critical patent/WO2004086702A1/fr

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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

Definitions

  • the invention relates to a method for ensuring the transmission quality for data transmitted over a packet-oriented network.
  • the invention touches the fields of network technologies of switching technology and represents a contribution to the development of technologies for the transmission of data with quality of service characteristics over packet-oriented networks.
  • IP Internet Protocol
  • IP protocol IP protocol
  • IP networks offer a "best effort" transmission service, ie the quality characteristics of the service depend on the load and the circumstances of the network.
  • Protocols on the transport level such as TCP (Transfer Control Protocol) can ensure secure transmission of data packets, but there is no control over the delay time in the transmission of data packets, which is also important for voice transmission.
  • Another parameter that presents difficulties with the transmission of voice data is the variation in the delay in the transmission of data packets.
  • jitter One speaks here of the so-called jitter.
  • diff-serv concept defines service classes or classes of service (CoS), which are specified by setting bits in the packet header.
  • CoS classes of service
  • MPLS Multi Protocol Label Switching
  • RVSP Resource Reservation Protocol
  • the invention has for its object to provide a method for transmission of data traffic with quality of service features, which is efficient, simple and with little signaling effort and can be used with any network topology and network infrastructure.
  • the invention aims to control the
  • This packet-oriented network can also be a subnet or subnet, which is often also referred to as an autonomous system in the specialist literature dealing with routing protocols.
  • the method according to the invention is particularly suitable for a so-called core or backbone network, but is not restricted to such networks.
  • the transmission quality during the transmission of data is determined in parallel with the operation of the network.
  • the transmission quality is determined in each case between edge points or interfaces of the network for traffic to be transmitted between the edge points.
  • a boundary point of the network can be identified, for example, by a router or a network access device - often also called a gateway, if with network boundaries or Technology transitions (eg TDM-IP) connected, - given.
  • the transmission quality between two boundary points is determined by means of the transmission of test signals which are transmitted between two boundary points. After being mirrored between the same boundary points, the test signals can be transmitted back to their starting point, for example in order to be generated and evaluated at the same location.
  • a first device with director functionality ie with means for sending test signals and a second device with responder functionality, ie with incoming test signals
  • a pair of edge points that is, if necessary, to be mirrored and sent back to their starting point or evaluated.
  • the first device is assigned to a first edge point and the second device is assigned to a second edge point of the network.
  • the devices may, but need not, coincide with the edge points.
  • Test signals - possibly after mirroring by the second device and returning to the first device - can be evaluated based on a quality criterion for the transmission quality.
  • This criterion can be, for example, core parameters in the transmission of packet data, such as the delay, the jitter or the packet loss rate.
  • the term "criterion" should be understood in such a way that it can also mean compliance with limits for several of these parameters.
  • Test signals can be transmitted permanently or continuously or at intervals. In the latter case, for example, a test signal can be transmitted in the case of a request for a data transmission - if it were voice data, it would be better to speak of a connection request here. It is also possible to use the frequency of the transmission of test signals based on statistical data on the traffic intensity, for example on the BHCA (Busy Hour Call Attempts) parameters.
  • BHCA Busy Hour Call Attempts
  • test signals by the second device After receiving the test signals by the second device or after mirroring by the first device, these are evaluated in accordance with the quality criterion. In the event of an evaluation by the second device, a notification of the evaluation result can be transmitted to the first device for a reaction to improve the transmission quality.
  • a rejection occurs, for example, in response to a negative result in the last evaluation of a Test signal.
  • This evaluation of the test signal can be carried out either in the first device or in a packet-oriented switching center assigned to the first device and controlling the first device. If no mirroring is performed, the evaluation is, for example, in the second device or in a packet-based switching center that controls the second device and reports the evaluation result back in the direction of the origin of the test signal. If the results of the quality tests are negative, the further acceptance of requests for data transmission can be blocked, test signals being transmitted during the blocking time until the evaluation of the test signals again delivers positive results.
  • Corresponding tests can be carried out for all pairs of edge points or edge nodes of the network, between which data is transmitted, the transmission of which should correspond to a quality criterion.
  • Such data are provided, for example, by real-time traffic, ie by voice data or video data that are to be transmitted in real time as part of a telephone connection or video transmission between the participants. It is possible that the data traffic to be transmitted over the network is or will be prioritized. It is thus possible, preferably or primarily, to reject the transmission of low-priority data traffic if the evaluated test signals do not meet the quality criteria. A distinction must be made between two different cases: low-priority data traffic that does not have to meet the or a quality criterion can be rejected, or data traffic that does that
  • Quality criterion met For example, a distinction is made within speech traffic between speech to be transmitted with high priority and speech to be transmitted with low priority.
  • the first case would exist, for example, if the transmission of speech data is not rejected in the event of deterioration in the transmission of speech data by the To improve voice quality in the transmission over the network, but the transmission of data not to be transmitted in real time is restricted.
  • a constellation would be conceivable, for example, that different tariff groups and thus prioritizations exist for calls, so that a telephone call with a low priority has a higher probability of the connection not being established or broken off.
  • Transmission quality takes place over the network. No assumptions are made about the network, for example its topology or its functioning, nor are the structure or functionality of the network elements of the network prescribed.
  • the mirroring in particular makes it possible to evaluate the test signals at the point of their generation or generation. Possible re-routing or alternative routes within the network are taken into account by monitoring the transmission quality between the network's edge points. The control of the
  • Transmission quality measurement can be carried out by packet-based exchanges in whose area of responsibility the devices with director or responder function fall.
  • the method can be used for voice data.
  • the quality criterion for speech can be given by the so-called MOS (Mean Opinion Score) value.
  • MOS Mel Opinion Score
  • tests can be carried out for different coding methods and quality criteria according to the respective coding method can also be used. It is not necessary to carry out tests for all coding methods, but they can be limited to a representative selection of coding methods, the conclusions to others Allow coding methods for which no tests have been performed.
  • test results can be evaluated, for example, in accordance with the ITU-T standards P.861 / 862 standard "Exceptual Evaluation of Speed Quality (PESC), an objective method for end to end speach quality assesment of narrowband telephone networks and speach codex".
  • PESC Extra Evaluation of Speed Quality
  • MOS value has the advantage that it represents a direct measure of the quality of the traffic being transmitted, and not indirectly of criteria such as
  • Packet delay or jitter on the speech quality must be concluded.
  • Devices with director or responder functionality can be addressed using numbers, e.g. using numbers in accordance with the E.164 numbering plan.
  • ports can be reserved for the test signals in the devices from which the sending (director) or the reception (responder), including mirroring of test signals, is carried out.
  • voice data and the use of phone numbers for addressing this means that one or more phone numbers are permanently assigned to the reserved ports.
  • a list with the current speech quality for the other edge points to be reached from this edge point can be kept for each edge point.
  • This list is particularly the basis for access control for new connections. It is therefore also an access control list, in which the currently valid quality is shown for all achievable goals depending on the coding method.
  • This list is administered, for example, in each packet-based switching center that controls test traffic.
  • the data on the transmission quality can also be used for statistical post-treatment or post-processing.
  • the data about refusal or termination of data transmissions or connections can also be included in the charging. Additional advantageous developments are specified in the claims.
  • the figure shows a packet-based backbone network IPNet, which is formed with routers R. Three edge points EdgeF, EdgeB and EdgeM of the network are drawn in, which coincide with edge routers of the network. Each of the edge points EdgeF, EdgeB and EdgeM is connected to a .Gateway GWF, GWB and GWM assigned to it.
  • the gateways GWF, GWB and GWM each have director and responder functionality and are managed by packet-oriented switching centers P-VstF, P-VstB and P-
  • VstM for example controlled by means of the MGCP protocol (MGCP: Media Gateway Control Protocol). Generates an endpoint switching traffic controlled by these switching centers P-VstF, P-VstB or P-VstM to one controlled by one of the two further switching centers
  • the associated user data flows cross the backbone network IPNet.
  • IPNet backbone network
  • P-VstF, P-VstB and P-VstM current lists are kept about the MOS value for voice connections to one of the unassigned target points or devices.
  • the respective destinations F, B and M are assigned, for example, to the metropolitan areas of Frankfurt, Berlin and Kunststoff, which defines the first significant number (F: 06 ..., B: 03 ..., M: 08 ...) ,
  • the check of the voice quality for data transmitted from the edge point EdgeF to the edge point EdgeM is controlled, for example, by the packet-oriented switching center P-VstF.
  • This switching center P-VstF initiates the regular transmission of test signals or test messages TestV (TestV: for test traffic) by the gateway GWF.
  • TestV TestV
  • These test messages pass through the route between the TestV Gateway GWF and the edge point EdgeF are then transmitted from the edge point EdgeF to the edge point EdgeM and pass through the distance between the edge point EdgeM and the gateway GWM.
  • they are then reflected or mirrored and transmitted back to the gateway GWF on the route traveled or another route through the packet-based network IPNet.
  • the relative length of these sections is negligible compared to the total length of the section and the quality reduction caused there.
  • the quality of the transmission of the test signals from F to M is evaluated either preferably in the gateway GWF or also in the packet-oriented switching center P-VstF.
  • the table for the current MOS value shows that there is a MOS value of 3 for connections to target M and a MOS value of 4 for connections to target B.
  • Virtual trunks are grouped together (virtual bundle) by a process of the respective switching center in terms of signaling and switching technology.
  • the virtual trunks between two exchanges are administratively identified with a uniform character in the databases of the exchanges (eg in Berlin with "B-F” or "B-M").
  • the virtual trunks of the gateways GWF, GWB and GWM are also grouped together and are controlled by a special process of the associated switching center P-VstF, P-VstB or P-VstM.
  • a new so-called user program is created that is based on a or a plurality of Trunks test traffic.
  • the test traffic trunks are administratively identified in.
  • the user Pro.gram generates accordingly.
  • a fixed routine test plan A-side assignments of short duration (a few seconds) on dedicated ports on the two remote gateways that cannot be called by a public telephone.
  • the associated call numbers are in each case in the switching centers generating the test traffic P-VstF, P-VstB or.
  • P-VstM administrates and is available to the user program.
  • the ports that can be called by a gateway in the manner described above (MGCP endpoints) are administered in the remote gateways as ports with an inserted user data mirror (loop). (Alternatively, this property can also be administered in the packet-based switching centers, which would cause them to make an explicit mirror request via the control protocol, for example MGCP if B-side assignment is used.
  • the associated user data stream is reflected in the remote gateways MGB and MGM, making it the basis of a speech quality measurement of the gateway MGF generating the test traffic.
  • the test traffic is set up using coding methods typically used in the IP network (G.711, G.726, G.723.1, G.729) in typical packet length and jitter buffer length.
  • the methods according to ITU-T P.861 / 862 are preferably used for quality measurement.
  • Speech quality measurements are subjected to a statistical evaluation (e.g. statistical smoothing).
  • threshold values are administered in the packet-based switching centers P-VstF, P-VstB and P-VstM, which are evaluated via the new user program.
  • the minimum quality for reassignment possibly the minimum quality for stable connections and the minimum quality for reassignment based on defective speech quality are stored as threshold values.
  • the threshold values may be defined depending on the supported coding method.
  • the corresponding trunks are e.g.
  • the trunks marked administratively with "B-M” are provided with a re-assignment lock for the coding method in accordance with ITU-T standard G.711. If the quality improves again afterwards, approval is given for new assignments. However, if the quality is completely inadmissible, z. B. the successive release of connections via "B-M" trunks with coding G.711.
  • test traffic can also take place instead of a packet-based one
  • the GBF, GWB or GWM gateway behaves like a VoDSL (Voice over DSL) subscriber to an IAD / CPG / AGW and generates test traffic autonomously without being controlled by a packet-based exchange.
  • VoDSL Voice over DSL
  • Routine test regulations are e.g.
  • the B-side assignments of a test port with mirror function on the remote gateway can be made as described above.
  • the gateway itself and therefore not a process of a packet-based switching center is the test traffic generator and the sole statistical evaluator of the
  • both gateways generating test traffic autonomously and gateways controlled by a packet-based switching center interact with one another, e.g.
  • the gateway GWF could generate test messages without control, while the gateway GWM generates test signals controlled by the packet-based switching center P-VstM.
  • each gateway has an up-to-date image of the voice quality in the remote level.
  • This is e.g. B. the connection agents of the switching centers (PCU) provided for access via HTTP. It is accessed for new assignments and, if necessary, at certain intervals for verification or control of the voice quality of existing connections. Defense against new seizures and possibly triggering due to poor speech quality is then carried out by connection agents of the switching centers.
  • PCU switching centers

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

Abstract

L'invention concerne un procédé selon lequel la qualité de transmission entre deux points limite respectifs (limiteF, limiteM) dans un réseau orienté paquets (IPNet) est contrôlée parallèlement à la transmission de données utiles entre lesdits deux points limite (limiteF, limiteM). Des signaux d'essai (essaiV) sont générés en continu par une première passerelle (GWF), transmis d'un point limite (limiteF) vers un autre point limite (limiteM), réfléchis du côté du deuxième point limite (limiteM) par une deuxième passerelle (GWF) et retransmis vers la première passerelle (GWM) sur le trajet entre lesdits deux points limite (limiteF, limiteM). Ces signaux d'essais sont ensuite évalués dans la passerelle (GWF) ou dans un centre de commutation orienté paquets (P-VstF) commandant cette passerelle. Si l'évaluation indique que la qualité de transmission ne correspond plus à un critère de qualité caractérisant la qualité de service, la transmission de données supplémentaires entre les deux points limite (limiteF, limiteM) est rejetée afin de garantir la qualité de transmission. La présente invention permet de contrôler ou de commander la qualité de transmission dans des réseaux orientés paquets sans entraîner une charge de signalisation significative. La qualité de transmission est constamment surveillée de façon qu'une réaction rapide puisse survenir lorsque la qualité de transmission diminue.
PCT/EP2004/001628 2003-03-28 2004-02-19 Procede permettant d'assurer la qualite de service lors de la transmission de donnees par l'intermediaire de reseaux orientes paquets WO2004086702A1 (fr)

Applications Claiming Priority (2)

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DE10314170.7 2003-03-28
DE10314170 2003-03-28

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426942B1 (en) * 1997-10-17 2002-07-30 Alcatel Device and method for establishing a call connection
US20020114274A1 (en) * 2000-09-19 2002-08-22 Sturges James H. Packet based network for supporting real time applications
US20020116452A1 (en) * 2000-03-03 2002-08-22 Surgient Networks, Inc. Network connected computing system including storage system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426942B1 (en) * 1997-10-17 2002-07-30 Alcatel Device and method for establishing a call connection
US20020116452A1 (en) * 2000-03-03 2002-08-22 Surgient Networks, Inc. Network connected computing system including storage system
US20020114274A1 (en) * 2000-09-19 2002-08-22 Sturges James H. Packet based network for supporting real time applications

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