CN1240081A - Apparatus and method for translating QOS parameters for per-service category aggregation - Google Patents

Apparatus and method for translating QOS parameters for per-service category aggregation Download PDF

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CN1240081A
CN1240081A CN 97180419 CN97180419A CN1240081A CN 1240081 A CN1240081 A CN 1240081A CN 97180419 CN97180419 CN 97180419 CN 97180419 A CN97180419 A CN 97180419A CN 1240081 A CN1240081 A CN 1240081A
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cell
equals
rate
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CN1114298C (en
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克里什南·拉马克里什南
李怀秋
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Motorola Solutions Inc
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Motorola Inc
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    • 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
    • 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
    • H04L12/5602—Bandwidth control in ATM Networks, e.g. leaky bucket
    • 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
    • H04L2012/5624—Path aspects, e.g. path bundling
    • 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
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation

Abstract

An apparatus (1410) and method (300) for aggregating ATM virtual channels (1420) into virtual paths in order to gain bandwidth efficiency in the ATM network (1470). Virtual channels (1420) are aggregated into virtual paths (1430) according to ATM Service Category and further by ATM Traffic Descriptors (1440) and QoS Parameters (1450). An efficient set of QoS requirements (1450) for the virtual path are determined by the QoS requirements of the constituent virtual channels (1460).

Description

Be used to change equipment and method by the qos parameter of class of business set
The cross reference of related application
The present invention is relevant with following U. S. application, and this application is had by the assignee identical with the application's assignee, and does as a whole quoting so far with for referencial use:
By Whay Chiou Lee and Krishnan Ramakrishnan " be used in shared-media network set user's system, device, and method " in application same date.
Background
1. FIELD OF THE INVENTION
The present invention relates generally to communication system, relate in particular to set A TM pseudo channel and distribute effectively and use the available network bandwidth to allow.
2. the discussion of correlation technique
In information age today, exist the demand of the growth of the high-speed communication that can guarantee service quality (QoS) can be provided ever-increasing communication user number.For this purpose, development communication network and technology are to satisfy the current and following demand.Particularly develop the new network that can hold the greater amount user terminal, and developed the agreement of utilizing the effective additional bandwidth of these networks.
A kind of technology that will use more and more in the communication network in future is asynchronous transfer mode (ATM).ATM is a kind of communication protocol, uses the cell of fixed size to come to transmit several application messages in communication network.Design ATM is to satisfy the demand of advanced high-speed communicating network.Especially the use of fixed size cell makes the routing function in the intermediary switch of communication network inside obtain simplifying, and makes switch can not become " bottleneck " in the network.Also simplified the realization of QoS target in communication network.
Atm network comprises several interconnected ATM switch, and switch routes to terminal ATM user with ATM cell by source ATM user place.Each ATM user uses atm network interface unit (NIU) and atm network interface.From source ATM user (through source NIU) to terminal ATM user (through terminal NIU).Unidirectional connection in atm network is called pseudo channel and connects (VCC).
Each VCC has special qos requirement, generally can represent its feature according to one of five ATM classs of business, by characteristic is constant bit rate (CBR), real-time variable bit rate (RT-VBR), Non-Real Time Variable Bit Rate (NRT-VBR), can use bit rate (ABR) and specified bit rate (UBR) not.Then, every kind of ATM is professional by further characterization.Specifically, defined two groups of parameters, the class of business (ATM traffic descriptor) that a kind of regulation is produced by ATM user, and another kind of regulation is by the network service (qos parameter) of ATM customer requirements.
In order to set up VCC, used a kind of signaling protocol, come network is made the request that VCC is set up in requirement by it.In signaling protocol, stipulated the qos requirement (being the ATM class of business, ATM traffic descriptor, and qos parameter) of VCC.Permission access control (CAC) function in the atm network according to the connection of request with withdraw from the characteristics determined that is connected and whether can accept this request.If enough resources that can not provide network satisfy the qos requirement of regulation, then network is refused this request, and does not set up VCC.If but network can provide enough resources to satisfy the qos requirement of regulation, then network is accepted this request, sets up VCC.
In order to transmit information from source ATM user to terminal ATM user, VCC is by several ATM switch.Upward VCC is sent to a contiguous ATM switch from an ATM switch in virtual channel link (VCL).Each connects VCL sSwitch be called pseudo channel switch (VCS).Can regard VCC as several VCL sCascade, VCL sForm connection end to end from source NIU to terminal NIU together.
Each VCL has a virtual channel identifier (VCI).The VCL of identical VCI sCascade be called ATM pseudo channel (VC).VC provides the sequential one-way transmission of ATM cell from the source ATM switch to the terminal ATM switch, and these two ATM switch can be also can not be adjacent ATM switch.The all cells that transmitted by VC enter in the source ATM switch, pass all VCL that constitute VC sGo out in the terminal ATM switch.Thereby, also can regard VCC as several VC sCascade, each VC represents several VCL of being passed by VCC s
Atm network also is supported in the virtual connection on virtual route (VPs) rank, and VP has the right a lot of VC of same endpoints in unidirectional logical combination or the network sUse virtual route terminate load (Virtual Path Terminator) (VPT) with the VC among the VP sClassification (unbundle) is so that independently handle each VC.Connect the independent VC of distribution in (VPC) at virtual route can for ATM user to network requests VP business s, a short of VC sRequirement has the QoS higher than this VPC.Resemble VCC sThe same, set up VPC with signaling protocol s, and network also uses CAC to decide acceptance still to refuse VPC.
VPC in atm network sFor business control and resource management is very useful.Adopt and keep VPC sThe method of capacity can be reduced to and set up independent VCC sRequired processing.For example, can simplify greatly and be used for independent VCC sCAC.Because the policy reason also can be used VPC sSeparate VCC sBut, realize that the improvement of service control and resource management will be cost with the bandwidth efficiency.For example, the VC of composition sThe place (may have a plurality of have the ATM traffic descriptor of variation and the different atm service class of qos parameter) of the qos requirement of wide region is arranged, and the bandwidth of distributing to VP will be applicable to the service request of worst case.Therefore, the efficient of the VP utilized bandwidth of set is not very high.
Therefore, in atm network, need a kind of equipment and method, simplify CAC and connection management and use Internet resources effectively so that support additional VC s
Brief Description Of Drawings in the accompanying drawings,
Fig. 1 expresses support for the typical embodiment of the ATM communication system of independent pseudo channel;
Fig. 2 represents according to the end points of pseudo channel the ATM pseudo channel to be gathered the typical embodiment of the ATM communication system of virtual route;
Fig. 3 is a flow chart of pseudo channel being gathered virtual route;
Fig. 4 represents the typical embodiment of pseudo channel exchange well known in the prior art;
Fig. 5 represents the typical embodiment of pseudo channel exchange, wherein gathers pseudo channel according to the atm service category of pseudo channel;
Fig. 6 represents the typical embodiment of pseudo channel exchange, wherein by atm service category on a rank and by ATM traffic descriptor and qos parameter at another rank upper set pseudo channel;
Fig. 7 represents the typical embodiment of pseudo channel exchange, wherein VBR is connected with the CBR articulation set and arrives;
Fig. 8 is the flow chart of decision for the qos requirement of the set that is connected of CBR connection and similar CBR;
Fig. 9 is the flow chart of decision for the qos requirement of the set of the RT-VBR connection of similar CBR;
Figure 10 is the flow chart of decision for the qos requirement of the set of " burst " RT-VBR connection;
Figure 11 is the flow chart of decision for the qos requirement of the set of NRT-VBR connection;
Figure 12 is the flow chart of decision for the qos requirement of the set of ABR connection;
Figure 13 is the flow chart of decision for the qos requirement of the set of VBR connection;
Figure 14 is a block diagram of pseudo channel being gathered the equipment of virtual route according to the qos requirement of pseudo channel;
Figure 15 A is the block diagram of the set that is connected of expression CBR and similar CBR;
Figure 15 B is the block diagram of representation class like the set of the connection of the RT-VBR of CBR;
Figure 15 C is the block diagram of the set of expression " burst " RT-VBR connection;
Figure 15 D is the block diagram of the set of expression NRT-VBR connection;
Figure 15 E is the block diagram of the set of expression ABR connection; And
Figure 15 F is the block diagram of the set of expression VBR connection.
Describe in detail
As discussed above, in atm network, need a kind of equipment and method, be used for simplifying CAC and connection management and use Internet resources effectively so that support more VC sEmploying is according to VC sQos requirement and the end points in network gather VC sMethod, the present invention has simplified CAC and connection management and has used Internet resources effectively.Particularly several VC that same or similar qos requirement is arranged sGather among the VP, and distribute enough Internet resources to give this VP so that allow each VC that forms it sThe QoS target can be met.Such set allows accurately to determine the qos requirement of VP, allows VP bandwidth efficiency height.In addition, gather the management that VP has simplified VP like this, because can easily give the VC that forms the allocated bandwidth of set s
Be used to support the typical embodiment of the ATM communication system 100 of independent pseudo channel to be shown in Fig. 1.In this example, atm network 140 usefulness are labeled as VCSs110, three VCS of 120 and 130 sSupport six pseudo channels.By VCS s110 and 120 support to be labeled as VC 11And VC 12Pseudo channel.By VCS s110 and 130 support to be labeled as VC 21And VC 22Pseudo channel.By VCS s120 and 130 support to be labeled as VC 31And VC 32Pseudo channel.In this example, atm network 140 is the virtual support channel individually.
Be used for according to VC sEnd points with VC sGather VP sThe typical embodiment of ATM communication system 200 be shown in Fig. 2.In this example, as in system's 100 examples, three VCS of atm network 140 usefulness sSupport six VC sBut in system 200, the VC of identical end points sGather VP sIn.Therefore, pseudo channel VC 11And VC 12Gather virtual route VP 1In, pseudo channel VC 21And VC 22Gather virtual route VP 2In, pseudo channel VC 31And VC 32Gather virtual route VP 3In.As discussed above, come VC according to end points sGather VP sIn be useful for control of the business of atm network and resource management.
Fig. 3 is used for VC according to the present invention sGather VP sFlow chart.Method proceeded to for 320 steps, at the several VCs of this one step process by similar qos requirement by the beginning of 310 steps sForm VP.In 330 steps, method is by these several VC then sThe qos requirement of qos requirement decision VP, and at 399 EOSs.
Fig. 4-7 expression is used for VC sGather VP sSeveral typical embodiment of VCS410.In these examples, VCS410 supports from 420 1To 420 6Six VC s, stack up is called VC s420.At six VC sIn 420, two VC s(420 1With 420 2) be that CBR connects, and four VC s(420 3-420 6) be that RT-VBR connects.Connect 420 with VBR 3-420 6Distinctive ATM traffic descriptor and qos parameter distinguish them.Specifically, VBR connects 420 3PCR equal 100, SCR equals 75, and CDV equals 10 microseconds; VBR connects 420 4PCR equal 100, SCR equals 50, and CDV equals 20 microseconds; VBR connects 420 5PCR equal 100, SCR equals 25, and CDV equals 20 milliseconds; VBR connects 420 6PCR equal 100, SCR equals 10, and CDV equals 15 milliseconds.
Fig. 4 represents VC well known in the prior art s405 typical embodiment.In this example, six VC s420 gather among the VP430.Adopt this method to gather VC s, must distribute bandwidth to be applicable to VC to VP430 sThe service request of 420 worst case, the qos requirement of promptly big variation.Therefore, in this example, VP430 will be that efficient is extremely low and be unmanageable.
In the one embodiment of the present invention, according to VC sThe ATM class of business gather them.Fig. 5 represents the typical embodiment of VCS505, wherein according to VC sSix VC of ATM class of business set of 420 s420.In this example, two CBR are connected 420 1With 420 2Gather among first VP510, and four VBR are connected 420 3-420 6Gather among second VP520.Adopt this method to gather VC s, can connect at CBR and optimize VP510, and connect optimization VP520 at VBR.
In another embodiment of the present invention, on meticulousr rank according to VC sATM traffic descriptor and qos parameter, and their ATM class of business is gathered VC sFig. 6 represents the typical embodiment of VCS605, wherein by the ATM class of business on a rank, and by ATM traffic descriptor and qos parameter at six VC of another rank upper set s420.In this example, again CBR420 1With 420 2Two articulation sets are in VP510.But, have similar qos parameter by the tying up VBR VC of (be in this example cell time-delay change (CDV)) sFour VBR are connected 420 3-420 6Gather two VP sIn 610 and 620.The VBR VC of the CDV of two microsecond magnitudes requirement s(VC s420 3With 420 4) gather VP610 together, and the VBR VC of the CDV of two millisecond magnitudes requirement s(VC s420 5With 420 6) gather among the VP620 together.Adopt this method set VC s, VP610 can be for providing CDV to optimize in the microsecond scope, and VP620 can be for provide CDV to optimize in the millisecond scope.
In another embodiment of the present invention, certain VBR connection is connected set with CBR.As to be discussed below, SCR can be connected (below be called similar CBR connection) to the ratio of PCR greater than 0.5 RT-VBR and regard the connection that resembles CBR with very little loss in efficiency as.Fig. 7 represents the typical embodiment of VCS705, wherein VBR is connected and the CBR articulation set.In this example, two CBR are connected 420 1With 420 2With SCR the ratio of PCR is connected 420 greater than 0.5 VBR together 3Set forms VP710.Remaining VBR is connected 420 4-420 6, their all SCR are less than or equal to 0.5 to the ratio of PCR, assemble VP720.
As discussed above, distribute enough Internet resources for each VP in order that allow VP to satisfy the VC of its composition sQos requirement.In other words, each VP has its own special qos requirement, and this requirement is the VC from its composition sQos requirement in draw.The qos requirement of a VP is a foundation, but general and be not equal to, separately the VC of each composition sQos requirement.
In order to pass through set VC sIncrease bandwidth efficiency, will come to determine the qos requirement of VP like this, make VP higher than the situation efficient that each VC works independently.It is best also just for the VC of the composition of determining to provide VP that but prior art provided sThe qos requirement of allowing some leeway (that is, typical the worst situation) of VP of qos requirement the time wide directrix.Therefore, another aspect of the present invention comprises from the VC of the composition of VP sQos requirement determine qos requirement to VP.
Although can be with any VC with identical end points sGather among the VP, preferably will have the VC of identical or similar qos requirement sGather among the VP.Therefore, typically by the VC of identical ATM class of business sForm VP.So, be convenient to check conversion to the qos requirement of gathering by class of business.Note being defined as " minimum " value representation the strictest selective value in this group in the class value in the discussion below about the qos requirement conversion.
Describing CBR in order to the transmission of the constant bit stream of fixed bit rate connects.The ATM traffic descriptor that connects for CBR is peak cell rate (PCR).Qos parameter for the CBR class of business is that maximum cell shifts time-delay (Max CTD), and the cell time-delay changes (CDV), and cell loss ratio (CLR).Max CTD comprises the propagation delay of access delay and basic communication network.
In one embodiment, with in the connection of several CBR (or similar CBR) articulation set to a combination (connection of the similar CBR of following discussion).The PCR (PCRagg) of set is changed to the VC of the composition that equals all sThe PCRs sum, the Max CTD (MaxCTDagg) of set is changed to the MaxCTD that equals by the connection of forming of minimum MaxCTD, the CDV (CDVagg) of set is changed to the CDV that equals by the connection of forming of minimum CDV, and the CLR (CLRagg) of set is changed to the CLR that equals by the connection of forming of minimum CLR.
Fig. 8 is the flow chart 800 that is used for determining the qos requirement of the similar CBR of set be connected with to(for) CBR.Method proceeded to for 820 steps since 810 steps, and method is changed to the VC that equals all compositions at the PCR that this goes on foot VP sThe PCRs sum.Method proceeded to for 830 steps then, and method is changed to the Max CTD of VP in this step the Max CTD of the connection of the composition that equals to have minimum Max CTD.Method proceeded to for 840 steps then, and method is changed to the CDV that equals by the connection of forming of minimum CDV at the CDV that this goes on foot VP.Method to 850 step then, method is changed to the CLR of VP in this step the CLR of the connection of the composition that equals to have minimum CLR.At last, method is at 899 EOSs.
Transmit the business of cell with bit rate that changes and requirement in real time and describe the RT-VBR connection.The ATM traffic descriptor that connects for RT-VBR is peak cell rate (PCR), supported cell rate (SCR) and maximum burst scale (MBS).SCR represents the long-term Mean Speed that connects, and MBS is the maximum-norm of any burst (in cell) of producing during connecting.The Q0S parameter that connects for RT-VBR is identical with those qos parameters that connect for CBR, is called MaxCTD, CDV and CLR.
During typical R T-VBR connected, the business in the connection had the silent period (sound and real-time image are the good examples of RT-VBR business) that burst with PCR produces the cycle of cell and do not produce cell.Connect in order to gather RT-VBR, according to the SCR that connects the ratio of PCR being come is each link sort easily further.As SCR during near PCR, the work of connection resembles CBR and connects very much.If SCR surpasses a predetermined value to the ratio of PCR, for example 0.5, then this connection is thought the connection of similar CBR, can regard CBR as with little bandwidth loss and connect.In one embodiment, in the set connection of the articulation set to of several similar CBR.The PCR (PCRagg) of set is changed to the VC that equals all compositions sPCRs and, with the set SCR (SCRagg) be changed to the VC that equals all compositions sSCRs's and, the MBS (MBSagg) of set is changed to the VC of all compositions sMBSs and.In another embodiment, as discussed above, the connection of several similar CBR and CBR are connected set.
But,, then this connection is thought that " burst " connects if SCR is less than or equal to predetermined value to the ratio of PCR.If like this, this " burst " connected connects as CBR that to treat be inefficient because network is wanted bandwidth reserved, this bandwidth only 50% or less time utilized.In other words, from the connection of similar CBR, divide the collection efficiency that comes higher these " bursts " connection.Therefore, in one embodiment, be several " burst " articulation set that a set connects.The SCR (SCRagg) of set is changed to the VC that equals all compositions sThe SCRs sum and with the set MBS (MBSagg) be changed to the VC that equals all compositions sThe MBSs sum.The PCR (PCRagg) of set is changed to the VC that equals all compositions sPCRs weighting and, so PCRagg is greater than SCRagg but less than the VC of all compositions sThe PCRs sum.In one embodiment, PCRagg being changed to the mean value that equals two values, is the VC of SCRagg and all compositions in particular sThe PCRs sum.For the RT-VBR set of a large amount of " burst ", the selection of this PCRagg is enough.But,, then PCRagg to be put height, so that compensate big burst if MBSagg is big.Therefore, in another embodiment, PCRagg is the function of MBSagg.
In all RT-VBR set, the Max CTD (Max CTDagg) of set is changed to the Max CTD of the connection of the Max CTD that equals minimum, the CDV (CDVagg) of set is changed to the CDV of the connection of the CDV that equals minimum, the CLR (CLRagg) of set is changed to the CLR of the connection of the CLR that equals minimum.
Fig. 9 is the flow chart 900 that is used for determining the qos requirement of the set that the RT-VBR for similar CBR connects.Method proceeded to for 920 steps since 910 steps, and method is changed to the VC that equals all compositions at the PCR that this goes on foot VP sThe PCRs sum.Method proceeded to for 930 steps then, and method is changed to the VC that equals all compositions at the SCR that this goes on foot VP sThe SCRs sum.Method proceeded to for 970 steps then, and method is changed to the VC that equals all compositions at the MBS that this goes on foot VP sThe MBSs sum.Method proceeded to for 950 steps then, and method is changed to the Max CTD of VP in this step the Max CTD of connection of the composition of the Max CTD that equals minimum.Method proceeded to for 960 steps then, and method is changed to the CDV of VP the CDV of connection of the composition of the CDV that equals minimum in this step.Method proceeded to for 970 steps then, and method is changed to the CLR of VP in this step the CLR of connection of the composition of the CLR that equals minimum.At last, method is at 999 EOSs.
Figure 10 is the flow chart 1000 that is used for determining for the qos requirement of the set of " burst " RT-VBR connection.Method proceeded to for 1020 steps since 1010 steps, and method is changed to the VC that equals all compositions at the SCR that this goes on foot VP sThe SCRs sum.Method proceeded to for 1030 steps then, and method is changed to the VC that equals all compositions at the MBS that this goes on foot VP sThe MBSs sum.Method proceeded to for 1040 steps then, and method is changed to the VC that equals all compositions at the PCR that this goes on foot VP sThe weighted sum of PCRs.Method proceeded to for 1050 steps then, and method is changed to the MaxCTD of VP in this step the MaxCTD of connection of the composition of the MaxCTD that equals minimum.Method proceeded to for 1060 steps then, and method is changed to the CDV of VP in this step the CDV of connection of the composition of minimum CDV.Method proceeded to for 1070 steps then, and method is changed to the CLR of VP in this step the CLR of connection of the composition of minimum CLR.At last, method is at 1099 EOSs.
Except not requiring real-time transmission cell, the NRT-VBR connection is connected similar with RT-VBR.A kind ofly handle the method that NRT-VBR connects effectively and provide enough bandwidth, be buffered in burst that PCR receives simultaneously till arranging them by SCR to satisfy the SCR requirement.
In one embodiment, in the NRT-VBR connection with several NRT-VBR articulation set to a set.The SCR (SCRagg) of set is changed to the SCRs sum of the connection that equals all compositions and the MBS (MBSagg) of set is changed to the MBSs sum of the connection that equals all compositions.The PCR (PCRagg) of set is changed to bigger that among the PCR that is connected of the composition that equals SCRagg and the highest PCR.The CLR (CLRagg) of set is changed to the CLR of the connection of the CLR that equals minimum.
Figure 11 is the flow chart 1100 that is used for determining the qos requirement of the set that connects for NRT-VBR.Method proceeded to for 1120 steps since 1110 steps, and method is changed to the VC that equals all compositions with the SCR of VP in this step sThe SCRs sum.Method proceeded to for 1130 steps then, and method is changed to the VC that equals all compositions at the MBS that this goes on foot VP sThe MBSs sum.Method proceeded to for 1140 steps then, and method is changed to the PCR of VP in this step bigger that among the PCR that is connected of composition of the SCR that equals VP and the highest PCR.Method proceeded to for 1150 steps then, and method is changed to the CLR of VP in this step the CLR of connection of the composition of the CLR that equals minimum.At last, method is at 1199 EOSs.
With having minimum cell rate requirement, if but other bandwidth be ready to accept the business of other bandwidth can use the time again and delineate ABR and connect.The ATM traffic descriptor that connects for ABR is minimum cell rate (MCR) and peak cell rate (PCR), and wherein MCR is the minimum cell rate that connects the assurance that requires, and PCR is if network allows, and connection can be in order to the maximum cell rate of transmission.Therefore, transmission rate certain value between MCR and PCR of ABR connection.There is not the qos parameter of regulation for the ABR class of business.
In one embodiment, in the ABR of several ABR articulation set to the set connection.The MCR (MCRagg) of set is changed to the MCRs sum of the connection that equals all compositions and the PCR (PCRagg) of set is changed to the PCRs sum of the connection that equals all compositions, but be no more than the available channel width of supporting VP.
Figure 12 is the flow chart 1200 that is used for determining the qos requirement of the set that connects for ABR.Method proceeded to for 1220 steps since 1210 steps, and method is changed to the VC that equals all compositions at the MCR that this goes on foot VP sThe MCRs sum.Method proceeded to for 1230 steps then, and method is changed to the PCR of VP in this step and equals the available channel width and the VC of all compositions sThe PCRs sum in the middle of less that.At last, method is at 1299 EOSs.
VBR is not connected any bandwidth of assurance, and do not have qos requirement.The ATM traffic descriptor that connects for UBR is peak cell rate (PCR), and this speed is if network allows, and connection can be in order to the maximum cell rate of transmission.
In one embodiment, in the UBR connection with several UBR articulation set to a set.The PCR (PCRagg) of set is changed to the PCRs sum of the connection that equals all compositions, but is no more than the available channel width of supporting VP.
Figure 13 is the flow chart that is used for determining the qos requirement of the set that connects for UBR.Method proceeded to for 1320 steps since 1310 steps, and method is changed to the PCR of VP in this step and equals the available channel width and the VC of all compositions sThe PCRs sum in less that.At last, method is at 1299 EOSs.
Draw among Figure 14 and be used for according to qos requirement VC sGather the equipment 1410 among the VPs.Equipment 1410 comprises VC interface logic 1430, is used to support several ATMVCs1420.Logic of sets 1440 usefulness VC interface logics 1430 insert VC s, and with the VC of similar qos requirement sGather VC sIn.As discussed above, logic of sets 1440 can be according to the ATM class of business, ATM traffic descriptor, and VC sIn 1420 the qos parameter any or all VC of being used to gather of selecting sQoS logical one 450 is according to the VC that forms sQos requirement determine one group of qos requirement for VP.
Equipment 1410 also comprises atm interface logical one 460, is used at atm network 1470 inner joint VC sWith VPs.Atm interface logical one 460 inserts the VPs that formed by logic of sets 1440 and obtains one group of qos requirement for each VP from QoS logical one 450.
When logic of sets 1440 was gathered being connected of CBR and similar CBR, QoS logical one 450 was finished the method for describing and illustrating as in the flow chart 800, to determine one group of qos requirement to VP.Figure 15 A typical embodiment of drawing.In this example, with two CBR (or similar CBR) VC s1510 and 1511 gather among the VP1512 that the CBR type of service arranged.In order to illustrate, the PCR of VC1510 is 100, and MaxCTD is 50, and CDV is 10, and CLR is 20, and the PCR of VC1511 is 200, and MaxCTD is 40, and CDV is 125, and CLR is 30.Employing method 800, QoS logical one 450 is with VC s1510 and 1511 qos requirement is transferred in the qos requirement to VP1512.Obtain the qos requirement of VP as follows.The PCR that puts VP1512 equals VC s1510 and 1511 PCRs sum.Therefore, the PCR that puts VP1512 equals 300.The MaxCTD that puts VP1512 equals the MaxCTD of connection of the composition of minimum MaxCTD.Therefore, the MaxCTD that puts VP1512 equals the MaxCTD of VC1511, equals 40.The CDV that puts VP1512 equals the CDV of connection of the composition of minimum CDV.Therefore, the CDV that puts VP1512 equals the CDV of VC1510, equals 10.At last.The CLR that puts VP1512 equals the CLR of connection of the composition of minimum CLR.Be stranded this, the CLR that puts VP1512 equals the CLR of VC1510, equals 20.
When logic of sets 1440 collection class connected like the RT-VBR of CBR, QoS logical one 450 was finished as describing at flow chart 900 and the method for explanation, to determine one group of qos requirement for VP.Figure 15 B typical embodiment of drawing.In this example, the VC of two similar CBR RT-VBR s1520 and 1521 gather among the VP1522 that the RT-VBR type of service arranged.Be explanation, the PCR of VP1520 is 100, and SCR is 60, and MBS is 10, and MaxCTD is 50, CDV is 10, and CLR is 20, and the PCR of VC1521 is 200, and SCR is 150, and MBS is 20, MaxCTD is 40, and CDV is 125, and CLR is 30, using method 900, and QoS logical one 450 is with VC s1520 and 1521 qos requirement shifts and is the qos requirement to VP1522.The qos requirement to VP that obtains is as follows.The PCR that puts VP1522 equals VC s1520 and 1521 PCRs sum.Therefore, the PCR that puts VP1522 equals 300.The SCR that puts VP1522 equals VC s1520 and 1521 SCRs sum.Therefore, the SCR that puts VP1522 equals 210.The MBS that puts VP1522 equals VC s1520 and 1521 MBSs sum.Therefore, the MBS that puts VP1522 equals 30.The MaxCTD that puts VP1522 equals the MaxCTD of connection of the composition of minimum MaxCTD.Therefore, the MaxCTD that puts VP1522 equals the MaxCTD of VC1521, equals 40.Put the CDV of connection that 1522 CDV equals the composition of minimum CDV.Therefore, the CDV that puts VP1522 equals the CDV of VC1520, equals 10.At last, the CLR that puts VP1522 equals the CLR of connection of the composition of minimum CLR.Therefore, the CLR that puts VP1522 equals the CLR of VC1520, equals 20.
When logic of sets 1440 set " burst " RT-VBR connected, QoS logical one 450 was finished the method for describing and illustrating as in flow chart 1000, to determine one group of qos requirement for VP.Figure 15 C typical embodiment of drawing.In this example, with two " burst " RT-VBRVC s1530 and 1531 gather among the VP1532 that the RT-VBR type of service arranged.In order to illustrate, the PCR of VP1530 is 100, and SCR is 40, and MBS is 10, and MaxCTD is 50, and CDV is 10, and CLR is 20, and the PCR of VC1531 is 200, and SCR is 80, and MBS is 20, and MaxCTD is 40, and CDV is 125, and CLR is 30.Employing method 1000, QoS logical one 450 is with VC s1530 and 1531 qos requirement is transferred in the qos requirement to VP1532.The qos requirement to VP that obtains is as follows.The PCR that puts VP1532 equals VC sThe weighting of 1530 and 1531 PCRs and.Therefore, use weight coefficient 0.5 that the PCR of VP1532 is changed to and equal 150.The SCR that puts VP1532 equals VC s1530 and 1531 SCRs sum.Therefore, the SCR that puts VP1532 equals 120.The MBS that puts VP1532 equals VC s1530 and 1531 MBSs sum.Therefore the MBS that puts VP1532 equals 30.The MaxCTD that puts VP1532 equals the MaxCTD of connection of the composition of minimum MaxCTD.Therefore, the MaxCTD that puts VP1532 equals the MaxCTD of VC1531, equals 40.The CDV that puts VP1532 equals the CDV of connection of the composition of minimum CDV.Therefore, the CDV that puts VP1532 equals the CDV of VC1530, equals 10.At last, the CLR that puts VP1532 equals the CLR of connection of the composition of minimum CLR.Therefore, the CLR that puts VP1532 equals the CLR of VC1530, equals 20.
As logic of sets 1440 set NRT-VBR VC sThe time, QoS logical one 450 is finished the method for describing and illustrating as at flow chart 1100, to determine one group of qos requirement for VP.Figure 15 D typical embodiment of drawing.In this example, with the VC of two NRT-VBR s1540 and 1541 gather among the VP1542 that the NRT-VBR type of service arranged.In order to illustrate, the SCR of VC1540 is 40, and MBS is 10, and PCR is 100, and CLR is 20, and the SCR of VC1541 is 80, and MBS is 20, and PCR is 200, and CLR is 30.Using method 1100, QoS logical one 450 is with VC s1540 and 1541 qos requirement is transferred in the qos requirement to VP1542.The qos requirement to VP that obtains is as follows.The SCR that puts VP1542 equals VC s1540 and 1541 SCRs sum.Therefore, the SCR that puts VP1542 equals 120.The MBS that puts VP1542 equals VC s1540 and 1541 MBS sSum.Therefore, the MBS that puts VP1542 equals 30.Bigger that among the PCR that is connected of SCR that the PCR that puts VP1542 equals VP and the composition of the highest PCR.Therefore, the PCR that puts VP1542 equals the PCR of VC1541, equals 200.At last, the CLR that puts VP1542 equals the CLR of connection of the composition of minimum CLR.Therefore, the CLR that puts VP1542 equals the CLR of VC1540, equals 20.
As logic of sets 1440 integrated ABR VC sThe time, QoS logical one 450 is finished the function of describing and illustrating as flow chart 1200, to determine one group of qos requirement for VP.Figure 15 E typical embodiment of drawing.In this example, with two ABRVC s1550 and 1551 are integrated among the VP1552 that the ABR type of service arranged.In order to illustrate, the MCR of VC1550 be 40 and PCR be 100, and the MCR of VC1551 be 80 and PCR be 200.Using method 1200, QoS logical one 450 is with VC s1550 and 1551 qos requirement is transferred in the qos requirement to VP1552.The qos requirement to VP that obtains is as follows.The MCR that puts VP1552 equals VC s1550 and 1551 MCR sSum.Therefore, the MCR that puts VP1552 equals 120.The PCR that puts VP1552 equals the available channel width and the VC of all compositions sPCR sLess that among the sum.Therefore, suppose available channel width for supporting that PCR is 300 enough, the PCR that puts VP1552 equals 300.
VC as integrated logical one 440 integrated VBR sThe time, QoS logical one 450 is finished the method for describing and illustrating as flow chart 1300, to determine one group of qos requirement for VP.Figure 15 F typical embodiment of drawing.In this example, with the VC of two VBR s1560 and 1561 gather among the VP1562 that the VBR type of service arranged.In order to illustrate, the PCR of VC1560 is 100, and the PCR of VC1561 is 200.Using method 1300, QoS logical one 450 is with VC s1560 and 1561 qos requirement is transferred in the qos requirement to VP1562.The qos requirement for VP that obtains is as follows.The PCR that puts VP1562 equals the available channel width and the VC of all compositions sWith less that among the PCRs sum.Therefore, suppose that available channel width is enough to support that PCR is 300, the PCR that puts VP1562 equals 300.
As discussed above, the purpose that ATM VCs is gathered VPs is to adopt the method for productive set to improve bandwidth availability ratio in the atm network, the situation efficient height that set works independently than each VC.When on shared-media network, transmitting ATM VC sThe time, can be used in combination the ATM set with MAC user's set, as what in the U.S. Patent application of exercise question, illustrate for " being used for system; apparatus and method " shared-media network set user, relate to and as a reference the scalability (scalability) and the efficient of the MAC agreement that has also realized improving above.For example, can treat VP as a single MAC user, make that VP is a set MAC user (AMV) in the itself.But, notice VP set and MAC user gather be different application and be for different purpose this point very important, and probably be scalability and the efficient that a kind of set that has improved ATM bandwidth usage efficient may in fact reduce the MAC agreement, or conversely.Therefore, must decide the scope of application of every kind of aggregate type by the purpose of system.
Can be with the enforcement the present invention of other special forms without prejudice to essence of the present invention and fundamental characteristics.Described execution mode all is for illustrative purposes from every side, rather than in order to limit the present invention.

Claims (9)

1. method of using Internet resources effectively may further comprise the steps:
Several pseudo channels that similar operation quality requirement is arranged are gathered in the virtual route; And
Determine one group of operation quality requirement from the operation quality requirement of these several pseudo channels for virtual route.
2. the process of claim 1 wherein and gather the pseudo channel that set of steps has identical ATM class of business.
3. the process of claim 1 wherein and gather the pseudo channel that set of steps has identical ATM class of business and similar ATM descriptor and QoS parameter are arranged in described ATM class of business.
4. the process of claim 1 wherein that pseudo channel is one of following channel:
The pseudo channel of constant bit rate;
Supported cell rate is to the ratio of the peak cell rate real-time variable bit rate pseudo channel greater than a predetermined value;
Supported cell rate is less than or equal to the real-time variable bit rate pseudo channel of this predetermined value to the ratio of peak cell rate;
The Non-Real Time Variable Bit Rate pseudo channel;
Available bit rate pseudo channel; And
The pseudo channel that does not have the specified bit rate; And wherein:
For the constant bit rate pseudo channel, determining step produces one group of operation quality requirement to virtual route, comprising:
Peak cell rate equals the peak cell rate sum of several pseudo channels;
Maximum cell shifts the maximum cell transfer time-delay that time-delay equals the minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals the minimum in several pseudo channels and changes; And
Cell loss ratio equals the cell loss ratio of the minimum in several pseudo channels; And
To the ratio of the peak cell rate real-time variable bit rate pseudo channel greater than a predetermined value, determining step produces one group of operation quality requirement to virtual route, comprising for supported cell rate:
Peak cell rate equals the peak cell rate sum of several pseudo channels;
Supported cell rate equals the supported cell rate sum of several pseudo channels;
Maximum burst scale equals the burst scale sum of the maximum of several pseudo channels;
Maximum cell shifts the maximum cell transfer time-delay that time-delay equals the minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals the minimum in several pseudo channels and changes; And
Cell loss ratio equals the cell loss ratio of the minimum in several pseudo channels; And
For supported cell rate the ratio of peak cell rate is less than or equal to the pseudo channel of the real-time variable bit rate of this predetermined value, determining step produces one group of operation quality requirement for virtual route, comprising:
Peak cell rate equal several pseudo channels peak cell rate weighting and;
Supported cell rate equals the supported cell rate sum of several pseudo channels;
Maximum burst scale equals the maximum burst scale sum of several pseudo channels;
Maximum cell shifts the maximum cell transfer time-delay that time-delay equals the minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals the minimum in several pseudo channels and changes; And
Cell loss ratio equals the cell loss ratio of the minimum in several pseudo channels; And
For the pseudo channel of Non-Real Time Variable Bit Rate, determining step produces one group of operation quality requirement for virtual route, comprising:
Supported cell rate equals the supported cell rate sum of several virtual connections;
Maximum burst scale equals the burst scale sum of the maximum of several virtual connections; And
Peak cell rate equals bigger that among the following speed:
Supported cell rate; And
The peak-peak cell rate of several pseudo channels; And
For the pseudo channel of variable bit rate, determining step produces one group of operation quality requirement for virtual route, comprising:
The minimum cell rate equals the minimum cell rate sum of several pseudo channels; And
Peak cell rate equals less that in the following speed:
The peak cell rate sum of several pseudo channels; With
The available channel width in virtual support path; And
For the pseudo channel of specified bit rate not, determining step produces one group of operation quality requirement for virtual route, comprising:
Peak cell rate equals less that in the following speed:
The peak cell rate sum of several pseudo channels; With
The available channel width in virtual support path.
5. the method for claim 1, wherein pseudo channel comprises that first number of constant bit rate pseudo channel and supported cell rate are to the ratio of peak cell rate second number greater than the real-time variable bit rate pseudo channel of a predetermined value, and wherein determine the one group operation quality requirement of step generation, comprising for virtual route:
Peak cell rate equals the peak cell rate sum of several pseudo channels;
Maximum cell shifts the maximum cell transfer time-delay that time-delay equals the minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals the minimum in several pseudo channels and changes; And
Cell loss ratio equals the cell loss ratio of the minimum in several pseudo channels.
6. be used for using effectively the equipment of Internet resources, comprise:
Be used for having the pseudo channel of similar qos requirement to gather the logic of sets that forms a virtual route with several; And
The service quality logic is used for from the definite one group of quality of service requirement for virtual route of the quality of service requirement of several pseudo channels.
7. the equipment of claim 6 also comprises:
Exercisable atm interface logic is received and is used for the access of virtual path on the logic of sets and receives service quality in logic to obtain the quality of service requirement for virtual route.
8. the equipment of claim 6, wherein pseudo channel is one of following channel:
The pseudo channel of constant bit rate;
Supported cell rate is to the ratio of the peak cell rate real-time variable bit rate pseudo channel greater than a predetermined value;
Supported cell rate is less than or equal to the real-time variable bit rate pseudo channel of this predetermined value to the ratio of peak cell rate;
The Non-Real Time Variable Bit Rate pseudo channel;
Available bit rate pseudo channel; And
The pseudo channel of specified bit rate not; And wherein
For the constant bit rate pseudo channel, the service quality logic produces one group of quality of service requirement to virtual route, comprising:
Peak cell rate equals the peak cell rate sum of several pseudo channels;
Maximum cell shifts time-delay and equals maximum cell transfer time-delay minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals the minimum in several pseudo channels and changes; And
Cell loss ratio equals the cell loss ratio of the minimum in several pseudo channels; And
For supported cell rate to the ratio of peak cell rate greater than a predetermined real-time variable bit rate pseudo channel, the service quality logic produces one group of quality of service requirement to virtual route, comprising:
Peak cell rate equals the peak cell rate sum of several pseudo channels;
Supported cell rate equals the supported cell rate sum of several pseudo channels;
Maximum burst scale equals the burst scale sum of the maximum of several pseudo channels;
Maximum cell shifts time-delay and equals maximum cell transfer time-delay minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals minimum in several pseudo channels and changes; And
Cell loss ratio equals cell loss ratio minimum in several pseudo channels; And
For supported cell rate the ratio of peak cell rate is less than or equal to the pseudo channel of the real-time variable bit rate of this predetermined value, the service quality logic produces one group of quality of service requirement for virtual route, comprising:
Peak cell rate equals the weighted sum of the peak cell rate of several pseudo channels;
Supported cell rate equals the supported cell rate sum of several pseudo channels;
Maximum burst scale equals the burst scale sum of the maximum of several pseudo channels;
Maximum cell shifts time-delay and equals maximum cell transfer time-delay minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals minimum in several pseudo channels and changes; And
Cell loss ratio equals cell loss ratio minimum in several pseudo channels; And
For the pseudo channel of Non-Real Time Variable Bit Rate, the service quality logic produces one group of quality of service requirement for virtual route, comprising:
Supported cell rate equals the supported cell rate sum of several virtual connections;
Maximum burst scale equals the maximum burst scale sum of several virtual connections; And
Peak cell rate equals bigger that in the following speed:
Supported cell rate; And
The peak-peak cell rate of several pseudo channels; And
For the pseudo channel of variable bit rate, the service quality logic produces one group of quality of service requirement for virtual route, comprising:
The minimum cell rate equals the minimum cell rate sum of several pseudo channels; And
Peak cell rate equals less that in the following speed:
The peak cell rate sum of several pseudo channels; With
The available channel width in virtual support path; And
For the pseudo channel of specified bit rate not, the service quality logic produces one group of quality of service requirement for virtual route, comprising:
Peak cell rate equals less that in the following speed:
The peak cell rate sum of several pseudo channels; And
The available channel width in virtual support path.
9. the method for claim 1, wherein pseudo channel comprises that first number of constant bit rate pseudo channel and supported cell rate are to the ratio of peak cell rate second number greater than the real-time variable bit rate pseudo channel of a predetermined value, and wherein the service quality logic produces one group of quality of service requirement for virtual route, comprising:
Peak cell rate equals the peak cell rate sum of several pseudo channels;
Maximum cell shifts time-delay and equals maximum cell transfer time-delay minimum in several pseudo channels;
The cell time-delay changes the cell time-delay that equals minimum in several pseudo channels and changes; And
Cell loss ratio equals cell loss ratio minimum in several pseudo channels.
CN 97180419 1996-12-16 1997-11-06 Apparatus and method for translating QOS parameters for per-service category aggregation Expired - Fee Related CN1114298C (en)

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