WO2000022785A1 - Atm connection admission control device for dbr connections - Google Patents
Atm connection admission control device for dbr connections Download PDFInfo
- Publication number
- WO2000022785A1 WO2000022785A1 PCT/EP1999/007773 EP9907773W WO0022785A1 WO 2000022785 A1 WO2000022785 A1 WO 2000022785A1 EP 9907773 W EP9907773 W EP 9907773W WO 0022785 A1 WO0022785 A1 WO 0022785A1
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- WO
- WIPO (PCT)
- Prior art keywords
- value
- atm
- connections
- sub
- connection
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
- H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
-
- 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
- H04L2012/5629—Admission control
- H04L2012/5631—Resource management and allocation
- H04L2012/5632—Bandwidth allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5649—Cell delay or jitter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5681—Buffer or queue management
Definitions
- the invention is related to a device for Connection Admission Control (CAC) for an ATM switch, intended for admitting to said ATM switch an additional traffic stream, via an additional ATM connection of the DBR type, such that the "Quality of Service" of all DBR connections in said switch continues to meet certain conditions, a single buffer with capacity B being available for the composite traffic stream of all DBR connections at an output port with capacity C, while, as boundary condition, the total average load of the output port does not amount to more than p x C, where p is a constant with a value between 0 and 1.
- CAC Connection Admission Control
- ATM Asynchronous Transfer Mode
- QoS Quality of Service
- ATC ATM Transfer Capability
- Guaranteeing the values of the QoS parameters in advance is a characteristic which is focussed upon in ATM networks.
- a decision must be made for each requested connection whether the latter can or cannot be admitted to an ATM switch. Connections are only admitted if the Quality of Service of the connections which make use of the ATM switch do not exceed the limits set in advance.
- the entirety of methods which determine admittance or non-admittance of a requested ATM connection is called a Connection Admission Control (CAC) algorithm, a device for executing a CAC algorithm being called a CAC device.
- CAC Connection Admission Control
- ATC ATM Transfer Capability
- DBR Deterministic Bit Rate
- PCR Peak Cell Rate
- CDVT Cell Delay Variation Tolerance
- the PCR represents the maximum speed at which a connection may drive cells; the CDVT is a measure for the tolerance in the PCR.
- the entity CDVT denotes the degree in which the actual speed may exceed the PCR during (as a rule very short) periods of time.
- a Usage Parameter Control (UPC) device monitors whether each of the connections indeed satisfies its characteristic during the operating period of a connection. If this is not the case, then the UPC device can resort to removing cells of the related connection from the traffic stream.
- UPC Usage Parameter Control
- the invention relates, as indicated above, to a device which can be used for the CAC of an ATM switch, and indeed in particular for connections which satisfy the specifications of the "Deterministic Bit Rate” Transfer Capability.
- the said simple method for CAC does not take into account the consequences of such a buffer, such as cell loss as a result of a finite buffer capacity and delay.
- CDVT Cell Delay Variation Tolerance
- the "maximum burst rate" is introduced of a connection which is characterised by values for PCR and CDVT. Said maximum burst rate is the required buffer capacity to lead the related traffic stream, in an ideal situation and without cell loss, over an imaginary buffer (without mixing of other traffic streams) , assuming that the said imaginary buffer has a constant exit speed equal to PCR.
- a disadvantage of said methods is that "shaping" is not possible with all ATM switches and that introducing extra shapers in the network can be undesirable.
- [E.736] also describes a method for the case that connections have a known maximum burst rate, bn&x. Said connections are then approximated by a b ⁇ x batch Poisson process.
- This method has the disadvantage of (1) the Poisson process being an over- estimation of the traffic, which leads to less connections being able to be admitted than is actually possible on the basis of the required QoS guarantees, and (2) the assumption of an unequivocally determined br ⁇ vx for all connections, which can be unnecessarily inefficient in practice. In practice, namely, said value for h m could be quite high.
- [Gravey97] it is shown that the maximally allowable load of the ATM network decreases for increasing values of D MAX -
- [COST242] describes the method essentially as in [E.736], but refines it.
- the maximum batches which are used for approximation by Poisson batches do not always need to be the same as in [E.736], but are dependent upon the speed of the multiplexer.
- the batches must indeed be just as large as those of a Poisson process by which the traffic stream is approximated.
- [Mignau96] describes methods which are not based on the Poisson method but on the NxD/D/1- method, which is described below.
- a complex model is described in [Cidon95] . Said model is numerically unstable, however, and requires long calculation times.
- the NxD/D/1-model is numerically unstable, however, and requires long calculation times.
- NxD/D/1 - model One of the models on which the present invention is based is the NxD/D/1 - model.
- This model provides the probability distribution of the length of the queue in a system consisting of a buffer which is controlled by one server. Said system is supplied by N ideal (i.e. CDVT equal to 0) and equal traffic streams, each having an inter-cell arrival time of magnitude D and with initial starting times uniformly distributed over an interval of magnitude D. The unit of time is the time required to control one cell.
- CDVT equal to 0
- the invention seeks to provide in a device of the kind indicated in the preamble, which is pre-eminently suitable as CAC for ATM connections of the DBR type, in which both the discrete character of the traffic streams as well as the fact that the cell rate of each of the individual connections can show fluctuations above its nominal peak cell rate are taken into account. It distinguishes itself favourably from CAC devices based on the methods in the literature with respect to the following aspects:
- the device according to the invention has the property that the maximum number of connections able to be mixed is not limited much more than strictly necessary to prevent buffer overflow and thereby cell loss.
- the CAC device according to the invention combines a high efficiency with practical applicability.
- the CAC device according to the invention also provides the possibility of optimising the maximum number of allowable connections by selecting a certain value for the freely selectable constant K, albeit that this must be a whole number greater than or equal to 0. In many cases, the optimal value for K will depend on the most frequently occurring values of the CDVT of the ATM connections.
- the CAC device according to the invention comprises two sub- devices, each issuing a positive or negative result (signal) .
- the result of the whole device will be positive only if both sub-devices issue a positive result (signal) , and only then will a new connection to the ATM switch be grantable.
- the first sub-device determines whether sufficient bandwidth is available for the set of connections V, of which each connection vi is characterised by values for PCRi and CDVTi, which, after possible admission of the new connection, will make use of a certain output port; the second sub-device determines whether the available buffer capacity for the related port is sufficient.
- the first sub-device comprises:
- Said sum is subsequently compared with the product of p and C. If the said sum is less than or equal to said product, then the result of the sub-device is positive; otherwise the result is negative.
- the second sub-device comprises:
- An arithmetic unit which calculates a certain buffer size b s ,i for each of the connections Vi of the set V.
- Said buffer size is equal to either b max ,i minus the constant value K if b max ,i is greater than or equal to K, or equal to 0 if b max ,i is less than K.
- b ma ⁇ ,i it holds that it is possible, in an ideal situation, to conduct the related traffic stream without cell loss over an imaginary buffer with buffer size max ,i and exit speed PCRi (without mixing with other traffic streams) .
- b max ,i is calculated by the device by determination of the product of PCR and CDVTi.
- An arithmetic unit which determines the sum of the calculated values b s ,i for all connections of the set V. Said sum will be designated here by B s .
- An arithmetic unit which determines a buffer size B N , for which it holds that it is possible to multiplex N imaginary, identical traffic streams with constant cell rate, using a buffer of size B N , and indeed such that the probability of cell loss as a result of buffer overflow will not exceed the given value of ⁇ .
- N is here the number of connections in set V. It is also assumed that the average degree of occupation at the output of the buffer is equal to p.
- the buffer capacity B N is determined by application of the previously introduced NxD/D/1 model, where the probability of a buffer level of B cells being exceeded is designated by Q D (B)I.
- the arithmetic unit determines the lowest value of B, such that Q D (B)
- the value of B found in this way forms the value of B N .
- a device which compares the calculated value of B R with the given capacity B of the output buffer. If the value of B R is less than or equal to B, then the result of the sub-device is positive; if the value of B R is greater than B, then the result of the sub-device is negative.
- Fig. 1 shows a CAC device in general.
- the traffic parameters (PCR and CDVT) of an arbitrary number of already existing ATM connections V ⁇ ...v N - ⁇ are supplied to the CAC device, as well as the traffic parameters of a newly requested ATM connection v .
- a maximally allowable cell loss probability parameter ⁇ is furthermore supplied, as well as the applicable buffer capacity B and link capacity C.
- a maximally allowable degree of occupation p is also supplied. The result of the device is an
- Fig. 2 shows a diagrammatic overview of a CAC device according to the invention.
- the CAC device is composed of a sub-device 1 and a sub-device 2.
- Each sub-device can emit a positive ("admit") or a negative ("reject") signal. Both signals are supplied to a logical AND port 3, of which the output signal is only positive if both input signals are positive.
- Fig. 3 shows sub-device 1 in more detail.
- the PCR values of the N ATM connections are summed ( ⁇ PCR) in a device 4.
- the total capacity C of the output port is multiplied by a previously established coefficient p (0 ⁇ p ⁇ l) , corresponding to the desired maximum load.
- the result of the arithmetic unit 6 is positive if the value of ⁇ PCR calculated in device 4 is less than or equal to the product of p x C calculated by device 5; if that is not the case, the result is negative.
- Fig. 4 diagrammatically shows the sub-device 2.
- the traffic parameters of ATM connection i are formed by the entities Peak Cell Rate(PCRi) and Cell Delay Variation (CDVTj . ) .
- the sub-device 2 comprises a processor 7, which is shown in more detail in Fig. 5.
- each of the processors 7 calculates by multiplication the maximum burst rate b maX/ i of the two said traffic parameters.
- the difference between b max ,i and K (b max ,i - K) is calculated by a device 14.
- Sub-device 2 (see Fig. 4 again) consists of a number of processors 7, one for each ATM connection.
- the b s ,i results of each processor 7 are summed in a device 8 and result in a total value of B s .
- the total number of ATM connections N is entered in arithmetic module 9. Said module determines the lowest value of B, such that QS(B)
- B N is multiplied by the constant value K in a device 10 and forms the value B NK .
- a device 11 sums the values of B s and B NK and a device 12 compares the summed value with the given available buffer size B. If B S +B NK is less than or equal to B, then a positive "admit” signal, or otherwise a negative "reject” signal, is emitted.
- ITU-T 1.371 Traffic Control and Congestion Control in B-ISDN; ITU-T recommendation 1.371 (08/96); Geneva, August 1996.
- ITU-T 1.356 B-ISDN ATM layer cell transfer performance; ITU-T recommendation 1.356 (10/96); Geneva, October 1996.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/806,738 US6850881B1 (en) | 1998-10-12 | 1999-10-11 | ATM connection admission control device for DBR connections |
AU10385/00A AU1038500A (en) | 1998-10-12 | 1999-10-11 | Atm connection admission control device for dbr connections |
DK99953837T DK1121787T3 (en) | 1998-10-12 | 1999-10-11 | Device for ATM access control for DBR connections |
DE69933302T DE69933302T2 (en) | 1998-10-12 | 1999-10-11 | DEVICE FOR ATM CONNECTION AUTHORIZATION OF DBR CONNECTIONS |
EP99953837A EP1121787B1 (en) | 1998-10-12 | 1999-10-11 | Atm connection admission control device for dbr connections |
US10/948,051 US6907467B2 (en) | 1998-10-12 | 2004-09-23 | ATM connection admission control device for DBR connections |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1010295 | 1998-10-12 | ||
NL1010295A NL1010295C2 (en) | 1998-10-12 | 1998-10-12 | ATM Connection Admission Control body for DBR connections. |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09806738 A-371-Of-International | 1999-10-11 | ||
US10/948,051 Continuation US6907467B2 (en) | 1998-10-12 | 2004-09-23 | ATM connection admission control device for DBR connections |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000022785A1 true WO2000022785A1 (en) | 2000-04-20 |
Family
ID=19767954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/007773 WO2000022785A1 (en) | 1998-10-12 | 1999-10-11 | Atm connection admission control device for dbr connections |
Country Status (9)
Country | Link |
---|---|
US (2) | US6850881B1 (en) |
EP (1) | EP1121787B1 (en) |
AT (1) | ATE340459T1 (en) |
AU (1) | AU1038500A (en) |
DE (1) | DE69933302T2 (en) |
DK (1) | DK1121787T3 (en) |
ES (1) | ES2273511T3 (en) |
NL (1) | NL1010295C2 (en) |
WO (1) | WO2000022785A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7127526B1 (en) * | 2000-03-20 | 2006-10-24 | Nortel Networks Limited | Method and apparatus for dynamically loading and managing software services on a network device |
US7136352B2 (en) * | 2000-11-01 | 2006-11-14 | Lucent Technologies Inc. | Method and apparatus for processing of regulated connections in a communication network |
US7852759B2 (en) * | 2007-02-05 | 2010-12-14 | Cisco Technology, Inc. | Finite state machine of traffic stream metrics for adaptation of load-based call admission control in wireless networks |
JP4525780B2 (en) * | 2008-03-24 | 2010-08-18 | ソニー株式会社 | Reception device, transmission device, communication system, and relay server buffer setting detection method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0851706A1 (en) * | 1996-12-24 | 1998-07-01 | International Business Machines Corporation | Flow control for very bursty connections in high speed cell switching networks |
EP0862299A2 (en) * | 1997-02-28 | 1998-09-02 | Nec Corporation | Multi-class connection admission control method for asynchronous transfer mode (ATM) switches |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
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CA2214839C (en) * | 1995-03-08 | 2007-07-31 | Avril Joy Smith | Broadband switching system |
GB9513024D0 (en) * | 1995-06-27 | 1995-08-30 | Newbridge Networks Corp | Connection admission control system (cac) for atm networks |
JP3162975B2 (en) * | 1995-10-16 | 2001-05-08 | 株式会社日立製作所 | ATM switch using discard priority control management system |
WO1997022224A1 (en) * | 1995-12-13 | 1997-06-19 | International Business Machines Corporation | Connection admission control in high-speed packet switched networks |
JP3436845B2 (en) * | 1996-06-18 | 2003-08-18 | 日本電信電話株式会社 | Multi-class ATM call admission control method and apparatus |
FI970998A (en) * | 1997-03-10 | 1998-11-13 | Nokia Telecommunications Oy | Procedure for determining whether to allow a connection on a broadband network |
US5970064A (en) * | 1997-06-12 | 1999-10-19 | Northern Telecom Limited | Real time control architecture for admission control in communications network |
JP3262029B2 (en) * | 1997-07-17 | 2002-03-04 | ケイディーディーアイ株式会社 | Cell transmission switch call connection control device |
GB9718269D0 (en) * | 1997-08-28 | 1997-11-05 | British Telecomm | Connection admission control for connection orientated networks |
US6324165B1 (en) * | 1997-09-05 | 2001-11-27 | Nec Usa, Inc. | Large capacity, multiclass core ATM switch architecture |
US6754206B1 (en) * | 1997-12-04 | 2004-06-22 | Alcatel Usa Sourcing, L.P. | Distributed telecommunications switching system and method |
CA2229577A1 (en) * | 1998-02-12 | 1999-08-12 | Newbridge Networks Corporation | Method and apparatus for controlling traffic flows in a packet-switched network in order to guarantee service performance |
US6222824B1 (en) * | 1998-04-24 | 2001-04-24 | International Business Machines Corporation | Statistical call admission control |
CA2245367A1 (en) * | 1998-08-19 | 2000-02-19 | Newbridge Networks Corporation | Two-component bandwidth scheduler having application in multi-class digital communication systems |
US6459681B1 (en) * | 1998-11-13 | 2002-10-01 | Sprint Communications Company L.P. | Method and system for connection admission control |
US20040042400A1 (en) * | 1998-12-18 | 2004-03-04 | Telefonaktiebolaget Lm Ericsson | Connection admission control based on bandwidth and buffer usage |
EP1192768B1 (en) * | 1999-06-18 | 2003-08-13 | Nokia Corporation | A method for measurement-based connection admission control (mbac) in a packet data network |
US6697369B1 (en) * | 1999-09-28 | 2004-02-24 | Lucent Technologies Inc | Admission control adjustment in data networks using maximum cell count |
-
1998
- 1998-10-12 NL NL1010295A patent/NL1010295C2/en not_active IP Right Cessation
-
1999
- 1999-10-11 EP EP99953837A patent/EP1121787B1/en not_active Expired - Lifetime
- 1999-10-11 DK DK99953837T patent/DK1121787T3/en active
- 1999-10-11 US US09/806,738 patent/US6850881B1/en not_active Expired - Fee Related
- 1999-10-11 ES ES99953837T patent/ES2273511T3/en not_active Expired - Lifetime
- 1999-10-11 WO PCT/EP1999/007773 patent/WO2000022785A1/en active IP Right Grant
- 1999-10-11 AT AT99953837T patent/ATE340459T1/en not_active IP Right Cessation
- 1999-10-11 AU AU10385/00A patent/AU1038500A/en not_active Abandoned
- 1999-10-11 DE DE69933302T patent/DE69933302T2/en not_active Expired - Lifetime
-
2004
- 2004-09-23 US US10/948,051 patent/US6907467B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0851706A1 (en) * | 1996-12-24 | 1998-07-01 | International Business Machines Corporation | Flow control for very bursty connections in high speed cell switching networks |
EP0862299A2 (en) * | 1997-02-28 | 1998-09-02 | Nec Corporation | Multi-class connection admission control method for asynchronous transfer mode (ATM) switches |
Also Published As
Publication number | Publication date |
---|---|
DE69933302T2 (en) | 2007-09-20 |
DK1121787T3 (en) | 2007-02-12 |
US6907467B2 (en) | 2005-06-14 |
US20050038903A1 (en) | 2005-02-17 |
EP1121787A1 (en) | 2001-08-08 |
US6850881B1 (en) | 2005-02-01 |
DE69933302D1 (en) | 2006-11-02 |
EP1121787B1 (en) | 2006-09-20 |
NL1010295C2 (en) | 2000-04-13 |
ES2273511T3 (en) | 2007-05-01 |
AU1038500A (en) | 2000-05-01 |
ATE340459T1 (en) | 2006-10-15 |
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