WO2001003375A1 - Method and communication system for modifying transmission resources between a central communication device and several decentralised communication devices - Google Patents

Abstract

According to the invention, transmission partial resources (tpr1...3) which are respectively allocated to decentralised communication devices (ONU1...3) are at least partially reduced and the transmission quality of at least one connection (vCBR, vVBRrt, vVBRnrt1...x, vGFR1...y, vUBR), established via the respective reduced partial resource (tpr1...3) is determined. The scope of the respective partial resource (tpr1...3) is modified or maintained, depending on the transmission quality. An effective utilisation of the transmission resources (rpon) can be achieved in an advantageous manner, by maintaining the transmission quality of the individual connections (vCBR, vVBRrt, vVBRnrt1...x, vGFR1...y, vUBR).

Description

description

_V out and communication arrangement for adapting tragungstechnischen about ^¬ resources between a central and a plurality of decentralized communication devices.

In current communication networks designed according to the asynchronous transfer mode - ATM - several decentralized communication devices or several communication terminals respectively connected to the decentralized communication devices are connected to a higher-level ATM communication network via a subscriber access network or subscriber access network - also referred to as an ACCESS network connected. The subscriber access network can be configured, for example, according to a point-to-multipoint configuration as a passive optical network - also referred to as a PON - with the aid of glass fibers. To implement a passive optical network, no active optical or electrical components - such as amplifiers or multiplexers - are required, and no power supply is required within these networks. Passive optical splitters - also known as "splitters" or "combiners" - can be used to reach the subscribers connected to them from a central point. At the end points of the glass fibers there are special active devices for terminating the optical fibers

Transmission path arranged, in general an optical line termination "OLT" - hereinafter also referred to as an optical network control unit - and at a decentralized location further optical network units "ONU" - also referred to below as optical network termination units - are provided. The information is transmitted via the passive optical network either direction-separated with the help of two glass fibers, or via a single glass fiber as part of an wavelength division multiplex process.

Passive optical networks are known to the person skilled in the art through the ITU specification ITU-T G.983. The access of the network terminating units or to the Netzab ^¬ schlu _ß units connected communication terminal over the shared transmission medium to the higher-level ATM communication network is controlled by an access algorithm, which is usually supply speeds at high Übertra ^¬ and ^¬ Senen at a plurality of Schlos Communication terminals is implemented using hardware. With the aid of the access algorithm, a network termination unit requesting communication network resources is granted access authorization or access to the shared transmission medium. Instead of communication units, subordinate communication networks - eg local networks or LANs - can also be connected to the higher-level ATM communication network via the shared communication network.

In the publication “NOVEL ALGORHITHM FOR TIME DEVISION MULTIPLE ACCESS IN BROADBAND ISDN PASSIV OPTICAL NETWORKS, International Journal of Digital and Analog Communication Systems, VOL. 6, pages 55 to 62 (1993), M. Glade and H. Keller "describes, for example, a method for controlling access by network termination units to predetermined resources of a subscriber access network designed as a passive optical communication network. According to the disclosed method, in A network control unit, which is arranged centrally in the subscriber access network and is connected to each network termination unit, realizes a timer or counter for each network termination unit, which is started as part of the connection setups derived from the network termination units, a timer then expires or the counter then reaches a predetermined value Value as soon as a new data packet or a specially reserved memory area is filled with user data in an affected network termination unit and temporarily stored in a buffer memory also implemented in the network termination unit for data transmission t arranged Counters, or the dimensioning of the time until a timer expires, is dependent on the data transmission rates that are defined or reserved during the connection setup. A signaling signal indicating the expiry of a timer represents a network termination unit ^¬ individual request for a transmission authorization or access to the shared transmission medium, which sequentially takes place in a memory implemented in the network control unit and shared by all network termination units connected to the network control unit - eg FIFO memory - is saved. The stored access requests are read from this and transmitted as actual transmission authorization to the connected network termination units or communication terminals, as a result of which access to the shared transmission medium is granted. In the described method, for example, two timers can run at the same time, ie two simultaneous access requests would have to be saved and controlled. However, since two simultaneous accesses are not possible, one of the two access requests is delayed until the current access of the other access request has been completed. This delay is referred to as "cell delay variation". If several timers expire at the same time, the value of the "cell delay variation" is increased accordingly.

In the communication technology designed according to the asynchronous transfer mode, several ATM traffic types defined by the ATM forum - also known as ATM service classes or service offerings - are known, by means of which data connections or high-bit-rate data transmissions with different requirements for, for example, transmission bandwidth and delay times are supported , or be provided. In ATM communication networks, for example, voice, images and data can be made using a type of cell within the framework of ATM connections each having a guaranteed transmission quality and / or transmission properties. len multiplexing are transmitted over the same subscriber lines. The following ATM traffic types defined by the ATM Forum - also referred to below as ATM service classes - are mentioned as examples:

- "Constant Bit Rate" (CBR),

- "Variable Bit Rate - real rime" (VBRrt),

- "Variable Bit Rate - non real time" (VBRnrt),

- "Garanteed Frame Rate" (GFR), - "Unspecified Bit Rate" (UBR), and

- "Available Bit Rate" (ABR).

When establishing an ATM connection, within the framework of a CAC - Connection Admission Control - the ATM traffic parameters - traffic parameter - and the service quality - which represent the quality and / or the transmission properties of the ATM connections - and the quality of service - for the desired ATM traffic type Quality-of-service parameters or QoS parameters referred to - negotiated and specified in a so-called transport contract. Examples of ATM traffic parameters are "Peak Cell Rate, PCR", "Sustainable Cell Rate, SCR" and "Minimum Cell Rate, MCR". Examples of QoS parameters are "Cell Delay Variation, CDV", "Cell Transfer Delay, CTV", and "Cell Loss Ratio, CLR".

The ATM service classes CBR and VBR are particularly suitable for applications with high QoS requirements, such as multimedia services or video conference circuits with high quality image transmission. Constant Bit Rate CBR enables data transmission with a constant transmission speed and constant, very short delay times, the required bandwidth being characterized by the specification of a peak cell rate - “PCR” - which is provided during the entire duration of the connection got to. When establishing ATM connections of the ATM service class VBR, peak and minimum transmission rates are negotiated between the ATM communication network and the respective communication terminal. In this category under shoot between Real-Time (VBRrt) and non-real-time requirements (VBRnrt) ^¬ is the. The ATM service class VBRrt sets such strict Anforde ^¬ conclusions to the Zellverzogerung and the variation of Zeilverzogerungen how the ATM service class CBR, while only a certain upper limit must be adhered to in the ATM service class VBRnrt.

A minimum transmission rate is agreed for connections based on the ATM service class ABR, but the best possible transmission speed is always used, if possible.

The ATM service class UBR represents a quality of service in which, in contrast to CBR and VBR, no fixed bandwidth is reserved and no cell loss rate CLR is specified. No demands are made on the connection for a ÜBR connection to be set up or desired, and thus no transmission quota is guaranteed by the communication network.

In the specification ITU-T 1.356 "B-ISDN ATM Layer Cell

Transfer Performance "describes the division of the QOS classes defined by the ATM Forum into a permanent class (Class 1) and non-stringent classes (Class 2, Class 3, U-Class).

The object of the invention is to achieve effective use of the transmission technology resources provided by the transmission medium in the case of a plurality of connections, in particular ATM connections, which are conducted via a shared transmission medium, for example a passive optical network PON. The task is based on a method and a communication arrangement according to the features of the preamble of claims 1 and 19 solved by their characterizing features.

In the method according to the invention for adapting transmission-technical resources between a central and a plurality of decentralized communication devices, the central communication device allocates one transmission-technical partial resource to the decentralized communication devices depending on the quality and / or the transmission properties of at least one connection made via the respective transmission-technical partial resource , The essential aspect of the method according to the invention is that the transmission-technical partial resources allocated to the decentralized communication devices are at least partially reduced and the quality and / or the transmission properties of the at least one connection conducted via the respective reduced transmission-technical partial resource is determined. Depending on the quality and / or transmission properties, the scope of the reduced, transmission-related sub-resource allocated to a decentralized communication device is modified or retained.

The main advantage of the method according to the invention is that the flexible adaptation of the transmission technology resources provided by a jointly used transmission medium achieves an increased traffic throughput via the transmission medium and an effective use of the transmission technology resources of the jointly used transmission medium. The “burst behavior” in, for example, “passive optical networks” is improved by the at least temporary allocation of reserved but currently unused transmission capacities of the transmission medium.

This is advantageous if there is an at least partial reduction in the allocated transmission-related partial resources. cen vacant, the transmission system resources walls ^¬ reindeer, decentralized communication devices at least tempo ^¬, temporarily provided - in claim 2. By thus gained effekive use of bereitge through the transmission medium ^¬ presented transmission system resources, the number of devices connected to the transmission medium subscribers or the number of Transmission medium routed connections can be increased while maintaining the transmission quality of all connections.

According to a further advantageous embodiment, the at least one connection routed via the allocated, transmission-related partial resource is implemented in accordance with the asynchronous transfer mode ATM, the ATM connection being in accordance with a standardized ATM service class that specifies the quality and the transmission properties of the ATM connection is designed. The information to be transmitted in the context of an ATM connection is temporarily stored in at least one queue in each decentralized communication device. The current queue fill level, the at least one queue, is recorded and then the quality and the transmission properties of the respective ATM connections are determined by evaluating the result of the registration. Depending on the quality and the transmission properties, the allocated, transmission-related partial resource is modified. Claim 4. By using the method according to the invention in ATM connections designed according to the asynchronous transfer mode, the queues or ATMs arranged in the decentralized communication devices can advantageously Cell buffers are dimensioned to be less extensive and the delay times of ATM cells when the decentralized communication devices are run through are also reduced. Through the use of the respective queue fill levels for evaluating the quality and the transmission properties of the respective ATM connections, the method according to the invention is particularly suitable in accordance with the asynchronous transfer mode ATM designed communication networks, particularly simple and therefore economically feasible.

Advantageously be at more than a decentralized communication device guided ATM connections the waiting ^¬ snakes filling levels of the queues depending on the ATM service class detected the respective ATM connections and reviewed - claim 6. For each ATM service class is an ATM Service class-individual sum of the queue fill levels of the corresponding queues is formed, the ATM service class individual queue total fill level information being weighted as a function of the ATM service classes. The quality and the transmission properties of the ATM connections of an ATM service class are determined by evaluating the weighted, individual queue total fill level information specific to the ATM service class and, depending on the quality and the transmission characteristics, that of the decentralized communications. The transmission device sub-resource allocated to the device modified - claim 8. This advantageous ATM service class-specific evaluation of the quality and the transmission properties of ATM connections of an ATM service class achieves an optimal allocation of the transmission technical sub-resources of a shared transmission medium and in particular in communication networks designed according to the asynchronous transfer mode ATM achieve an optimal, ie effective use of the "upstream PON transport quality" taking into account compliance with the ATM quality features maybe.

Further advantageous embodiments of the method according to the invention can be found in the further claims.

The method according to the invention is explained in more detail below with the aid of two drawings. Show 1 shows a large number of communication terminals, which are connected to a higher-level communication network via a transmission medium that is shared and configured as a "passive optical network", and

FIG. 2 shows an exemplary scenario of ATM connections currently routed via an optical network termination unit connected to the “passive optical network” and correspondingly arranged connection-specific queues, which are read out as a function of the transmission sub-resource allocated to an optical network termination unit for information transmission.

FIG. 1 shows a block diagram of a subscriber access network ACCESS, via which a large number of communication terminals KE1.. Z assigned to each subscriber are connected to a higher-level communication network OKN. In this exemplary embodiment, the subscriber access network ACCESS is designed as a passive optical network PON in a point-to-multipoint configuration. A central component of the passive optical network PON is an optical network control unit OLT, which is connected, for example, via an optical fiber LWL to predetermined transmission resources vr of the higher-level communication network OKN. The higher-level communication network OKN is designed according to the asynchronous transfer mode ATM, the predetermined resources vr of the higher-level ATM communication network OKN comprising a data transmission rate of, for example, 155 Mbit / s. With the optical network control unit OLT three optical network termination units ONU1 ... 3 are connected via several glass fibers and via a passive optical splitter - also called "splitter" or "combiner", whereby the three optical network termination units ONU1 ... 3 and the shared transmission medium "passive optical network" PON is completed by the optical network control unit OLT. The three optical network termination units ONU1 ... 3 are the total ^¬ z communication terminals KE1 ... Z is connected, wherein an access from each communication terminal KE1 ... Z can be carried out in the ^'vr predetermined resources of the ATM communication network OKN. The request for resources can be done, for example, administratively in the context of network management or in the context of packet-oriented transmission protocols - for example TCP / IP - by transmitting a corresponding connection establishment message from a communication device KE1 ... Z to the corresponding optical network termination unit ONU1 ... 3 respectively. A corresponding, protocol-based connection setup to the optical network control unit OLT and from this to the higher-level, ATM-oriented communication network OKN is then initiated by the respective optical network termination unit ONU1 ... 3. In the course of establishing the connection, corresponding ATM connections are then assigned to the respective optical network termination unit ONU1 ... 3 or the respective communication terminal KE1 ... Z.

Various ATM service classes are defined by the ATM forum, each ATM connection belonging to an ATM service class being specified by certain ATM traffic parameters and QoS parameters. For example, ATM connections of the "Constant Bit Rate, CBR" service class and the "Variable Bit Rate - real time, VBRrt" service class have a specific "Peak Cell Rate, PCR" as the guaranteed data transmission rate - also referred to as the "guaranteed minimum transmission capacity" , ATM connections of the ATM service class "Variable Bit Rate - non real time, VBRnrt" have a certain "Sustainable Cell Rate, SCR" and ATM connections of the ATM service class "Guaranteed Frame Rate, GFR" and ATM -Service class "Available Bit Rate, ABR" has a specific "Minimum Cell Rate, MCR" as the guaranteed data transfer rate.

The optical network control unit OLT uses one optical network termination unit depending on the _O NU1 ... 3 associated with ATM connections and depending on the particular ATM service class of the associated ATM Verbindun ^¬ gene of the access of the individual optical network terminating units ONU1 ... 3 to the shared transmission medium "ves passivation optical network" PON controlled. For this rule in opti ^¬ network control unit OLT is arranged, an access control unit MAC, by means of which at the level of the ATM MAC layer - Medium Access Control - specifying on the basis of different, the single ^¬ NEN ATM connections ATM traffic parameters and QoS parameters it is determined in which optimal order the three optical network termination units ONU1 ... 3 in the "upstream direction" for information transmission access to the shared transmission medium "passive optical network" PON.

The transmission of access information controlling access to the shared transmission medium "passive optical network" PON - also referred to as "grants" - from the optical network control unit OLT to the connected optical network termination units ONU1 ... 3 is in the specification ITU-T G.983 described in more detail. No further details will be given here.

For this exemplary embodiment, it is assumed that the shared transmission medium "passive optical network" PON has certain time-multiplex-oriented, transmission-related resources rpon and that the three optical network termination units ONU1 ... 3 each have transmission-related partial resources of the time-division-based transmission resources rpon are allocated, whereby the three optical network termination units ONU1 ... 3 are granted access to the "Passive Optical Network" PON as part of a TDMA access procedure. Furthermore, it is assumed that a different number of ATM connections are made via the "Passive Optical Network" PON via the three optical network termination units ONU1 ... 3. Depending on the ATM traffic parameters and the QoS parameters of the respectively assigned ATM connections are - controlled by the optical power control unit OLT - the first opti ^¬'s network terminating unit 0NU1 first time division multiplex-oriented partial resources tprl of the Passive Optical Network work PON, the second optical network termination unit ONU2 second time-division multiplex-oriented partial resources TPR2 and third optical network terminating unit ONU3 third time-multi plex ^¬-oriented partial resources tpr3 allocated for the transmission of information in "Upstrea direction". The allocation of time-division multiplex-oriented partial resources tprl ... 3 by the optical network control unit OLT is also referred to as "grant generation".

The control according to the invention of the access of the optical network termination units to the shared transmission medium PON is explained in more detail below. For this purpose, the current connection situation of ATM connections via one of the optical network termination units ONU1... 3 shown in FIG. 1 to the higher-level ATM communication network OKN is shown in FIG. 2 as an example. According to FIG. 2, three ATM connections vCBRl... 3 of the stringent class CBR according to the specification ITU-T 1.356 are carried out via the optical network termination unit ONU1 ... 3 shown. Furthermore, via the optical network termination unit ONU1 ... 3, an ATM connection vVBRrt of the ATM service class VBRrt, x ATM connections vVBRnrtl ... x of the ATM service class VBRnrt, y ATM connections vGFRl ... y der ATM service class GFR and an ATM connection of the ATM service class vUBR.

The communication terminals KEl ... n, KEn + l ... m, KEm + l ... z connected to the optical network termination unit ONU1 ... 3 within the three stringent ATM connections VCBR1 ... 3 in " Information or ATM cells transmitted upstream direction are temporarily stored in a first queue WS1, which is shared by the ATM connections of the ATM service class CBR, the respectively temporarily stored ones _A TM cells are read out of the first queue WS1 after the FIFO pπnzip. The ATM cells transmitted via the ATM connection vVBRrt are temporarily stored in a second queue WS2. Furthermore, the ATM cells of the x ATM connections vVBRnrtl ... x of the ATM service class VBRnrt are in a third to kth queue WS3 ... k and in a 1st to mth queue WSl .. .m each ^¬ because the ATM cells of the y ATM connections vGFRl ..y of the ATM service class GFR are buffered. ATM cells of the ATM connection vUBR of the ATM service class UBR are temporarily stored in an nth queue WSn. In contrast to ATM connections of the ATM service class CBR, there is a connection-specific queue WS2 ... nm for each ATM connection of the tolerant ATM service classes, ie for ATM connections of the ATM service classes VBRrt, VBRnrt, UBR, GFR Power supply unit ONUl..3 provided.

The queues of ATM connections of a tolerant ATM service class VBRrt, VBRnrt, UBR, GFR are read using the weighted fair queuemg algorithm - also known as WFQ scheduler. In the WFQ scheduler, the respective queues WS2 ... n are read out in a weighted manner depending on the ATM service class VBRrt, VBRnrt, UBR, GFR of the respective ATM connection. The weighting factor of the respective queues WSl ... n arranged in an optical network termination unit ONUl 3 is configured to be parameterizable, the weighting factors of a control unit STG arranged in the optical network termination units ONUl ... 3 depending on the ATM traffic parameters - PCR, SCR, MCR - and the QoS parameters - CDV, CTD, CLR - of the respective ATM connections vCBRl.,. 3, vVBRrt, vVBRnrt .x, vGFRl y, vUBR currently conducted via the optical network termination unit ONUl..3.

An absolute delay priority algorithm - also referred to as an ADP scheduler - is superordinate to the WFQ scheduler which the queue of ATM connections of the stringen ^¬ th class - here WS1 - are read out with priority.

Conventional manner are the transmission system partial resources tprl ... 3 of the passive optical network PON and weighting- ^¬ factors ... 3 arranged in the optical network termination units Onul queues WSL ... n of an optical network terminating unit Onul ... assigned 3 configured that all guaranteed transmission capacities of the ATM connections VCBR1 ... 3, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR via the respective optical network termination unit ONUl ... 3 are observed. According to the invention, the access control unit MAC arranged in the optical network control unit OLT reduces the transmission-related sub-resources tprl ... 3 ATM service classes individually assigned to the individual optical network termination units ONUl ... 3, so that the individual optical network termination units ONUl ... 3 allocated and now reduced partial resources tprl ... 3 only a part of the sum of the guaranteed, minimum transmission resources of the ATM connections VCBR1 ... 3, vVBRrt, vVBRnrtl, which are routed via the respective optical network termination units ONUl ... 3 ... x, vGFRl ... y, vUBR is included. In this way, the free transmission resource of the passive optical network PON in the "upstream direction" can be used flexibly by other optical network termination units ONUl ... 3 for the transmission of ATM cell bursts.

According to the invention, in order to implement central monitoring of the ATM traffic parameters and the QoS parameters of the respective ATM connections vCBRl... 3, vVBRrt, WBRnrtl ... x, vGFRl ... y, which are conducted via an optical network termination unit ONUl ... 3 , vUBR the current fill levels fsl ... n of the queues WSl ... n each arranged in an optical network termination unit ONU1 ... 3 - also referred to as "ONU output queues" - transmitted to the optical network control unit OLT

Querying the current queue fill levels fsl ... n of the queues WSl ... n directed in the "upstream direction" optical network termination unit ONUl ... 3 is carried out by the optical network control unit OLT in a fixed time frame. About to be specified in an ITU-TG.983 passive optical network PON unit from the optical Netzkontroll- OLT using PLOAM cells - Physical Layer Ope ration ^¬ / Administration and Maintenance cells - to the delegation ^¬ account the current queue fsl levels ... n from all connected optical network termination units Onul ... calls 3 is ^¬. In response from the respective optical network termination units Onul ... 3 corresponding to the current War ^¬ tesch long-levels representing queue level information fsl ... n using special minicells - also known as "mini-slots" means - to the optical network control unit OLT transmitted.

The queue fill level information fsl ... n of the queues WSl ... n arranged in an optical network termination unit ONUl ... 3 is advantageously transmitted individually, ie ONU1 ... 3 is in each case in the respective optical network termination unit the sum of the fill levels - referred to in FIG. 2 as ifs_CBR, ifs VBRrt, ifs_VBRnrt, ifs_GFR, ifs_UBR - of ATM connections vCBRl.,. 3, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR or of queues In each case an ATM service class CBR, VBRrt, VBRnrt, GFR, UBR is formed and transmitted to the optical network control unit OLT. According to FIG. 2, for the ATM service class VBRnrt, for example, the sum of the fill levels of the third to kth queue WS3 ... k - here ifs VBRnrt = ∑ fs3 ... k - and the sum of the fill levels of the 1st to m -th queue WSl ... m - here ifs_GFR = ∑ fsl ... m - formed and transmitted to the optical network control unit OLT. In the case of queues set up for virtual connections — also referred to as “virtual connection” VC — not shown in FIG. 2 — the sum of the fill levels of the respective queues assigned to the virtual connection is advantageously transmitted. In the optical network control unit OLT for each supplied ^¬ associated ATM service class CBR, VBRrt, VBRnrt, GFR, UBR a first upper ATM class of service of individual queue-provided gen-sum level limit value X _HIGH 1 ... S or instructions ^' saves. Stored with them, the ATM service classes ^¬ individual queues sum level limits X _HIGH 1 ... S be the optical of the three Netzabschlußeinhei ^¬ th ONU1 ... 3 to the optical network control unit OLT transmitted ATM service class individual queue sum Menu level information ifs_CBR, ifs VBRrt, ifs_VBRnrt, ifs_GFR, ifs_UBR permanently compared. According to the invention, the access control MAC arranged in the optical network control unit OLT is configured in such a way that the three optical network termination units ONUl ... 3 have access to the passive optical network PON

depending on the ATM service class of the respective ATM connections vCBRl... 3, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR and the comparison results of the transmitted, via the optical network termination units ONUl ... 3 ATM service class individual queue fill level information ifs_CBR, ifs_VBRrt, ifs_VBRnrt, ifs_GFR, ifs_UBR with the stored queue total fill level limits x _h ι _g hl ... s.

The following ATM traffic parameters are relevant for controlling the access to the Passive Optical Network PON for the respective ATM service classes:

- for ATM connections of the ATM service class CBR and VBRrt the traffic parameter "Peak Cell Rate (PCR)",

- for ATM connections of the ATM service class VBRnrt the ATM traffic parameter "Sustainable Cell Rate (SCR)" and - for ATM connections of the ATM service class GFR the ATM traffic parameter "Minimum Cell Rate (MCR)". Is the optical in the network control unit OLT be ^¬ dedicated access control unit MAC for the attached ^¬ closed, the optical network termination units Onul ... 3 is a high ^¬ exceed one of the data stored in the optical network control unit OLT, first upper ATM service class individual queues -Summenfüllstands limits _HIGH X 1 ... S is determined, is determined by the access control unit MAC to the affected optical network terminating unit Onul ... 3 allocated in redu ^¬ ed peripheral transmission technical Teilres- source tprl ... 3 in the type and Increased again that the affected ATM connections vCBRl... 3, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR of the corresponding ATM service class CBR, VBRrt, VBRnrt, GFR, UBR again guaranteed the minimum Transmission capacity is provided. The increase in the transmission computational partial resources tprl ... 3 of the passive optical network PON allocated to an optical network termination unit ONUl ... 3 as part of the method according to the invention takes place in dependence on the respective ATM service class CBR, VBRrt, VBRnrt, GFR, UFR :

for ATM connections of the ATM service class CBR - here of the tolerant class - and the ATM service class VBRrt, the allocated partial resources tprl ... 3 are at least based on the sum of the "peak cell rate (PCR)" of all CBR / VBRrt connections - fertilize increased, for ATM connections of the ATM service class VBRrt the allocated partial resources tprl ... 3 are increased at least to the sum of the "Sustainable Cell Rate (SCR)" of all VBRnrt connections, and - for ATM connections the ATM service class GFR, the allocated partial resources tprl ... 3 are increased at least to the sum of the "minimum cell rate (MCR)" of all GFR connections.

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© + J <H d Φ 4-J 10 Φ Φ to 1 4-J tn -H XS XI Φ XI P Φ -HX) XI ud xi d CM P x: tn .yx \ -HM Oil ^• HP Xi .H rH C 1 P d XI. υ -H Φ υ ri φ SH o υ CQ rö S-ι υ -PP d 4-J d P d si In SI dd SH -H u SH -P S4 Φ to 3 tt P ^• H to Φ o ^• H υ H Φ -H a -H φ d Φ Φ rd -H: P £ α Φ CD Φ rd Φ -H φ [0 rd -HX! Φ Φ Φ i-5 SH Φ -H d>4-J> d O g> X ⁾ d υ rd H 5 tu O 4-JP> tn ES rH 2 X ⁾ -HX) ES rd tn rH P oo Xi d

vVBRnrtl x, vGFRl ... y ..., vUBR of non-stringent th classes with the below each garantier for the ATM connection ^¬, minimum transmission capacity is read out. Geous before ^¬ each in an optical network terminating unit ONU1 ... 3 arranged queue WSL ... n associated with a second upper queue level threshold y _H ι _G Hl-S. The data stored in the optical network control unit OLT first upper, ATM Service Class individual queue sum menfüllstands limits X _HIGH 1 ... S and the dung individual in the optical network termination units ONU1 ... 3 stored second verbin ^¬ queue filling level Limit values V _HIGH 1-S have a fixed relation to each other. The ratio of these queue limit values y _H iGH / xmGH depends on the polling frequency of the queue fill levels fsl ... n of the queues WSl ... n directed in the "upstream direction" and can be set to the value 1 from a specific polling frequency If the control unit STG arranged in the optical network termination unit ONU1... 3 determines that one of the second upper queue fill level limit values y _H ι _G Hl-S is determined, the weighting factors of the queues WS1 ... n recalculated Using the newly calculated weighting factors, the queues WSl ... n are read out within the framework of the minimum transmission capacities guaranteed for the individual ATM connections.

For example, there may be a case in which incorrect queue fill level information fsl ... n or faulty ATM service class individual queue total fill level information ifs_CBR, ifs_VBRrt, ifs_VBRnrt, ifs_GFR, ifs_UBR from the optical network termination units ONU1 ... 3 be transmitted to the optical network control unit OLT. This can have the consequence that the readout speed of the WFQ schedulers in the optical network termination units ONU1 ... 3 is not with the time-division-multiplex-oriented partial resources tprl ... 3 of the passive optical system allocated to an optical network termination unit ONU1 ... 3 PON network is tuned so that, for example the guaranteed, minimum transmission capacity that ATM connections of lower priority according to the classified ATM service classes ^¬ not longer be maintained. In order to prevent possible data losses, the first upper ATM service class individual queue total fill level limit value X _HIGH 1 ».S assigned to a queue WSl ... n is advantageously used - controls the allocation of the transmission-related partial resources tprl ... 3 of the passive optical Network PON - set lower than the assigned second upper queue fill level limit value Y _HI GHI-S - controls the WFQ scheduler of an optical network termination unit ONUl ... 3, whereby an overflow of a queue WSl ... n by the optical network control unit is recognized early. This prevents that when transmission errors occur when transmitting queue level information to the optical network control unit OLT, the latter does not have enough transmission-related partial transmission resources tprl ... 3 of the passive optical network PON to provide the individual optical see network termination units ONUl ... 3 and thus the guaranteed minimum transmission capacities of the ATM connections VCBR1 ... 3, vVBRrt, vVBRnrtl ... x, vGFRl ... y, which are routed via an optical network termination unit ONUl ... 3, vUBR cannot be complied with temporarily.

According to a further advantageous embodiment of the method according to the invention - not shown - there is an additional first lower ATM service class-individual queue for the queues WSl ... n arranged in an optical network termination unit ONUl ... 3.

Total fill level limit value and a second lower connection-specific queue fill level limit value are provided, wherein if the value falls below the first lower ATM service class assigned to a queue WSl ... n, individual, queue total fill level limit values correspond to those of the respective optical network termination unit ONUl ... 3 allocated transmission-technical partial resource tprl ... 3 reduced and if the value falls below the second lower connection-specific queue fullness limit, the readout speed of the WFQ scheduler is reduced - for example below the sum of the guaranteed minimum transmission capacities of all ATM connections vCBRl 3, vVBRrt, vVBRnrtl ... x, vGFRl. ..y, vUBR each of an ATM service class CBR, VBRrt, VBRnrt, GFR, UBR.

The generation or calculation of the upper and lower ATM service classes with individual queues

Total fill level limit values or connection-specific queue full level limit values can be carried out in a first step by input via a network management interface arranged in each case in the optical network termination units ONU1 ... 3 or in the optical network control unit OLT. Alternatively, particularly in the case of complex network configurations, these queue fullness limit values are set by an algorithm in the respective optical network termination units ONU1 ... 3 or in the optical network control unit OLT depending on the ATM traffic parameters of the respective ATM connections vCBRl.,. 3 , vVBRrt, vVBRnrtl ... x, vGFRl. y, vUBR calculated.

The method according to the invention is particularly suitable for subscriber access networks ACCESS in which little or no signaling functionalities are transmitted to the ATM layer. However, the method according to the invention can also be used for “switched virtual connections” or SVC connections. In this case, the current ATM traffic parameters of the respective ATM connections vCBRl .3, vVBRrt, WBRnrtl ... x, vGFRl .. y , vUBR to the optical network termination units ONUl ... 3 and the optical network control unit OLT.

If the OLT optical network control unit has an “ATM switch” functionality, the provision of the ATM traffic parameters for the optical network control

LO LO

Claims

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3. The method of claim 1 or 2, characterized in that upon detection of non-compliance of the guaranteed Quality ^¬ formality and / or the transmission characteristics of at least one of the compounds (vCBR vVBRrt, vVBRnrtl ... x, y vGFRl ..., vUBR) which is allocated on a decentralized communication device (ONU1 ... 3), reduced partial resource (tprl ... 3) leads ge ^¬, the scope of the allocated, reduced, partial transmission system resource (tprl ... 3) is increased.

4. The method according to any one of the preceding claims, characterized in that

- that the at least one connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) routed via the respective assigned transmission-technical sub-resource (tprl ... 3) is implemented in accordance with the asynchronous transfer mode ATM, the ATM connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) being designed in accordance with a standardized ATM service class that specifies the quality and transmission properties of the ATM connection,

- That in each decentralized communication device (ONUl ... 3) the information to be transmitted in the context of an ATM connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) is in at least one queue (WSl .. .n) are temporarily stored,

that the current queue fill level (fsl ... n) of the at least one queue (WSl ... n) is recorded,

- That the quality and the transmission properties of the respective ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) are determined by evaluating the acquisition result and the assigned transmission technology, depending on the quality and the transmission properties sub-resource (tprl ... 3) is modified.

5. The method according to claim 4, characterized in that the ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) each in accordance with the ATM service classes - constant bit rate (CBR), or

- Variable bit rate - real time (VBRrt), or

- Variable bit rate - non real time (VBRnrt), or

- Guaranteed Frame Rate (GFR) or

- Unspecified Bit Rate (UBR) or - are designed in accordance with a further ATM 'service class defined by the ATM forum, the ATM service classes having the quality-of-service classes defined in the specification ITU-T 1.356 - Classl, Class2, Class3, U Class - can be assigned,

6. The method according to claim 4 or 5, characterized in that with several over a decentralized communication device (ONU1 ... 3) ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) the queue levels

(fsl ... n) of the queues (WSl ... n) depending on the ATM service class of the respective ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) recorded and evaluated become.

7. The method according to any one of claims 4 to 6, characterized in that

- that the acquisition results are transmitted to the central communication device (OLT), and - that in the central communication device (OLT) the quality and the transmission properties of the respective ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) are evaluated and, depending on the quality and the transmission properties, the transmission-related partial resources (tprl ... 3) allocated to the decentralized communication devices (ONU1 ... 3) are modified.

8. The method according to claim 6 and 7, characterized in

- that for each ATM service category, an ATM service class individual sum of the queue filling levels of the ent ^¬ speaking queues (WSL ... n) is formed, wherein the formed ATM service class individual queues sum level information (ifs_CBR, ifs_VBRrt, ifs_VBRnrt, ifs_GFR, ifsJJBR) are weighted depending on the ATM service classes,

- that by evaluating the weighted, ATM service class individual queue total fill level information (ifs_CBR, ifs VBRrt, ifs_VBRnrt, ifs_GFR, ifs_UBR) in each case

ATM service class-specific the quality and the transmission properties of the ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) of an ATM service class is determined, and depending on the quality and the Transmission properties that are assigned to the decentralized communication device (ONU1 ... 3), transmission-related partial resource (tprl ... 3).

9. The method according to any one of claims 4 to 8, characterized in

- that the queue level information (fsl ... n) of ATM connections (VCBR1 ... 3), which the stringent class -

Classl - assigned according to ITU-T 1356, are not taken into account, and

- That a decentralized communication device (ONU1 ... 3) assigned, transmission-technical sub-resource (tprl ... 3) at least the sum of the guaranteed minimum transmission capacity of all the ATM-connections (vCBRl.) carried over the allocated transmission-technical sub-resource (tprl ... 3) .,. 3) of the stringent class according to ITU-T 1.356.

10. The method according to any one of claims 4 to 9, characterized in that a decentralized communication device (ONU1 ... 3) allocated, transmission-technical partial resource (tprl ... 3) is reduced such that for the at least one ATM connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) of an ATM service class the sum of the guaranteed minimum transmission capacity is undershot.

11. The method according to any one of claims 4 to 10, characterized in that for each decentralized communication device (ONU1 ... 3)

- for each ATM service class individual queue fill level information (ifs_CBR, ifs_VBRrt, ifs_VBRnrt, ifs_GFR, ifsUBR) a first upper ATM service class individual, queue total fill level limit value (XHIGH) is defined,

- If it is determined that one of the defined first upper queue total fill level limits (XHIGH) has been exceeded, that of the decentralized communication device

(ONU1 ... 3) allocated transmission-technical partial resource (tprl ... 3) is increased in such a way that this at least

- the sum of the peak cell rate of all CBR and / or VBRnrt connections and / or - the sum of the sustainable cell rate of all VBRnrt connections, and / or

- The sum of the minimum cell rate of all GFR connections is included.

12. The method according to any one of claims 4 to 11, characterized in that the queues (WS1 ... 3) arranged in a decentralized communication device (ONU1 ... 3) in dependence on the ATM service classes of the ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) and depending on the allocated, transmission-related partial resource (tprl ... 3).

13. The method according to any one of claims 4 to 12, characterized in that the individual queues (WSl ... n) in a decentralized communication device (ONU1 ... 3) with a reduction in the allocated, transmission-related partial resource (tprl ... 3) ) below the respective guaranteed minimum Übertra ^¬ transfer capacity of the respective ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, y vGFRl ..., vUBR) are read out.

14. The method according to any one of claims 4 to 13, characterized in that the queues (WSl ... n) arranged in a decentralized communication device (ONU1 ... 3) are read out as part of the weighted fair queuing algorithm (WFQ) , in which

- a weighting factor is assigned to the queues (WSl ... n) depending on the ATM service classes of the respective ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR), and

- The queues (WSl ... n) are read out depending on the assigned weighting factors.

15. The method according to claim 14, characterized in that the readout process according to the weighted fair queuing algorithm (WFQ) is superimposed on another readout process (ADP) designed according to the absolute delay priority algorithm, through which the queues (WS1) of Prioritized ATM connections of the stringent class can be read out.

16. The method according to any one of claims 4 to 15, characterized in that in each decentralized communication device (ONU1 ... 3) - for each queue (WSL ... n) a second upper waiting ^¬ Snake individual queue filling level threshold value (y i _{H G} H) is defined,

- If it is determined that one of the defined second upper queue fill level limits (y _H iGH) has been exceeded, which corresponds to the queues (WSl ... n) of the corresponding ATM connections (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) for ^¬ divided weighting factors are recalculated.

17. The method according to any one of the preceding claims, characterized in

that the transmission resources (rpon) are provided by a passive optical communication network (PON), the central communication device (OLT) being designed as an optical network control unit and the decentralized communication devices (ONU1 ... 3) being designed as optical network termination units,

- that the transmission-related partial resources (tprl ... 3) allocated to the decentralized communication devices (ONUl ... 3) are time-multiplex-oriented, and

- That the decentralized communication devices (ONUl ... 3) are assigned access from the passive optical communication network (PON) as part of a TDMA access procedure.

18. The method according to any one of claims 1 to 16, characterized in that the transmission resources (rpon) are realized within an SDH or SONET ring.

19. Communication arrangement (ACCESS) with one central and several decentralized communication devices (OLT, ONU1 ... 3) and with one transmission technology resource (rpon) arranged between the central and decentralized communication devices (OLT, ONU1 ... 3) having transmission medium (PON), having disposed in the central communication device (OLT) controller (MAC) for the allocation of resources exceeds tragungstechnischen part (tprl ... 3) to the dezentra ^¬ len communication devices (ONU1 ... 3), respectively in dependence on the quality and / or the transmission properties of at least one connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) via the respective transmission resource (tprl ... 3), characterized in that - the control unit (MAC ) is designed in such a way that the transmission-related partial resources (tprl ... 3) allocated to the decentralized communication devices (ONU1 ... 3) are at least partially reduced,

- that the decentralized communication facilities (ONUl ... 3) - acquisition means for recording the quality and / or

Transmission properties of the at least one connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) via the reduced, transmission-related partial resource (tprl ... 3), and - means for transmitting the acquisition result to the central communication device (OLT),

- That the control unit (MAC) comprises modification means by which the extent of the reduced, transmission-related partial resource (tprl ... 3) allocated to a decentralized communication device (ONU1 ... 3) is modified or retained depending on the detection result.

20. Communication arrangement according to claim 19, characterized in that the modifying means are designed such that if a non-compliance with the quality and / or the transmission properties is determined, at least one of the connections (vCBR, vVBRrt, WBRnrtl ... x, vGFRl ... y, vUBR), which is managed via the reduced partial resource (tprl ... 3) allocated to a decentralized communication device (ONU1 ... 3), the The scope of the allocated, reduced, transmission-technical partial resource (tprl ... 3) is increased.

21. Communication arrangement according to claim 20, characterized in that

- that the at least one of the allocated transmission resource ^¬ technical part (tprl ... 3) guided compound (vCBR, vVBRrt, vVBRnrtl ... x, y vGFRl ..., vUBR) according to the Asyn ^{¬-synchronous} transfer mode ATM is designed , the ATM connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y, vUBR) being designed in accordance with an ATM service class defined by the ATM forum and specifying the quality and transmission properties of the ATM connection,

- That in each decentralized communication device (ONU1 ... 3) at least one queue (WSl ... n) for buffering the in the context of the at least one ATM connection (vCBR, vVBRrt, vVBRnrtl ... x, vGFRl ... y , vUBR) is intended to be transmitted information,

- That each decentralized communication device (ONU1 ... 3) level detection means for detecting the current queue level (fsl ... n) of the at least one queue (WSl ... n) and for transmitting the acquisition result the control unit (MAC) arranged in the central communication device (OLT) has - that the control unit (MAC) is designed such that the quality and the transmission properties of the respective ATM connections (vCBR, vVBRrt, vVBRnrtl ..) .x, vGFRl ... y, vUBR) are determined and, depending on the quality and the transmission properties, the transmission-related partial resources (tprl ... 3) allocated to the decentralized communication devices (ONU1 ... 3) are modified.