WO2002099574A2 - Systeme et procede permettant de redimensionner la largeur de bande d'une liaison physique en fonction de l'utilisation de celle-ci - Google Patents

Systeme et procede permettant de redimensionner la largeur de bande d'une liaison physique en fonction de l'utilisation de celle-ci Download PDF

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Publication number
WO2002099574A2
WO2002099574A2 PCT/US2002/017378 US0217378W WO02099574A2 WO 2002099574 A2 WO2002099574 A2 WO 2002099574A2 US 0217378 W US0217378 W US 0217378W WO 02099574 A2 WO02099574 A2 WO 02099574A2
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WIPO (PCT)
Prior art keywords
bandwidth
allocated
link
reserved
medium
Prior art date
Application number
PCT/US2002/017378
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English (en)
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WO2002099574A3 (fr
Inventor
Li Mo
James A. Spallin
Jennifer J. Liu
Abinder S. Dhillon
James H. Buchanan
Badarinath Devalla
Original Assignee
Fujitsu Network Communications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Network Communications, Inc. filed Critical Fujitsu Network Communications, Inc.
Priority to AU2002345566A priority Critical patent/AU2002345566A1/en
Publication of WO2002099574A2 publication Critical patent/WO2002099574A2/fr
Publication of WO2002099574A3 publication Critical patent/WO2002099574A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities

Definitions

  • This invention relates to network technologies and, more particularly, to a system and method for resizing the bandwidth of a physical link based upon the utilization of the link.
  • Real-time delivery of media over communication networks consistently strains network operators' ability to reliably and efficiently deliver data in a timely manner.
  • data intensive services such as streaming audio and video media, Internet content delivery, video conferencing and other services
  • transmission capacity shortages on many types of networks.
  • high bandwidth end-user equipment such as digital subscriber line technologies and cable modems
  • Communication carriers continue to upgrade backbone and switching systems.
  • the growth in media demand is often outpacing network operators ability to upgrade network transmission capacity.
  • Communication carriers often lease network lines, or portions of the capacity thereof, to corporate subscribers.
  • Various services have been introduced to satisfy different customer needs. Best effort services are deployed for customer transmissions that may be categorized as low priority and not adversely effected by transmission delays. Best effort transmissions across a medium may be preempted by higher priority data and may be delayed until sufficient network capacity exists.
  • High priority transmissions may have dedicated portions of a transmission medium, such as a fiber optic medium, statically allocated and dedicated to particular types of data transmissions such as video conferencing. The bandwidth allocated may be set-aside and unavailable for other data transmission types such as email or Internet content delivery. By dedicating a portion of a transmission medium capacity, the customer knows precisely how much data may be delivered at a given moment and allows the customer to plan and allocate data transmissions accordingly.
  • a system and method for providing resizing of the bandwidth of a physical link based upon the utilization of the link is desirable.
  • a network operable to allocate a link on a communication medium and resize the bandwidth of the link based upon utilization thereof is provided.
  • a communication link having a first bandwidth is allocated.
  • Utilization of the link is monitored and the link is resized according to the utilization of the link.
  • a method of resizing a link in a communication medium is provided.
  • a link having a first reserved bandwidth is allocated.
  • the link is monitored and utilization of the link is determined.
  • the link is resized according to the monitored utilization.
  • a second link is then allocated and includes a portion of the first reserved bandwidth.
  • FIGURE 1 is an exemplary network on which the present invention may be implemented
  • FIGURE 2 is a communication medium that may support one or more channels between nodes terminating the medium;
  • FIGURES 3A and 3B are a communication medium at different stages of channel allocation therein;
  • FIGURE 4A is a communication medium with reserved channels and utilization thereof as allocated according to the prior art;
  • FIGURE 4B is the communication medium of FIGURE 4A with reserved channels and utilization thereof as allocated according to the teachings of the present invention.
  • FIGURE 5A-5E is a communication medium in various scenarios of channel allocation and deallocation thereon according to the teachings of the present invention.
  • FIGURE 1 there is illustrated an exemplary network 100 including nodes 10-12 interconnected by communication links 15A-15C.
  • Network 100 may be implemented using any suitable transmission technology.
  • network 100 is a fiber optic network and, accordingly, nodes 10-12 may be implemented as optical transport network nodes although the particular transmission medium is irrelevant with regard to the scope of the invention.
  • network 100 may be any type of network capable of making data transmissions across a communication medium terminated by two nodes, for example node 10 and 11.
  • implementation of the present invention may be made in any number of network configurations, for example a ring network 100, a mesh network, etc.
  • the communication medium need not be a 'land line,' as the present invention may find application on a radio frequency medium such as a wireless data network, a mobile communication network, etc.
  • Network 100 may employ a management node, such as management control system (MCS) node 30, that may be in communication with one or more nodes 10-12. Control of various network 100 functions may be facilitated through MCS 30. Link allocation and deallocation on mediums 15A-15C may be directed by MCS 30 as well as enforcement of network 100 policies. Link utilization monitoring is performed by the present invention by gathering link usage metrics and link resizing is directed by MCS 30 as is described more fully hereinbelow.
  • MCS management control system
  • FIGURE 2 there is illustrated a communication medium 200 that may support one or more channels between nodes terminating medium 200.
  • Medium 200 has a maximum available bandwidth capacity that may be defined by the physical limitations of medium 200 and/or by the limitations of the nodes terminating medium 200.
  • the bandwidth of medium 200 is partitionable into one or more channels, or links, each having a respective bandwidth that may be allocated for making data transmissions and/or time division multiplexed traffic on the charmel(s) between the nodes terminating medium 200.
  • a channel allocation may be made upon a request for a transmission or, alternatively, a reserved channel may be allocated on medium 200 and the reserved channel bandwidth of the allocated channel may be reserved on medium 200 for any future transmission requests.
  • Channel allocations may be partitioned as well. While the invention described herein provides resizing of allocated channel
  • ⁇ bandwidth the invention may be applied to resizing of channel partitions as well.
  • Various classes of services may be defined that prioritize transmissions across a particular channel. Service classes facilitate quality of service guarantees and enable a network operator to levy various fees for different priorities and network resources that are provided to a subscriber.
  • a reserved channel class may be defined and include a guaranteed bandwidth that is available on medium 200 at all times. Accordingly, bandwidth of a reserved channel includes a portion of medium 200 capacity that is unavailable to other classes of service and other channel allocations.
  • a reserved channel is a static allocation of a predefined bandwidth and may be used for transmission types that are latency-sensitive, for example audio-video streaming such as teleconferencing.
  • Another exemplary class of service is a best effort channel class.
  • a best effort channel is allocated upon transmission request and is not guaranteed to be immediately available, that is allocation of a best effort channel class may be made any time after a transmission request and when medium 200 capacity is available.
  • a best effort channel may be used for low priority transmissions that are not generally latency-sensitive, for example email transmissions.
  • Medium 200 includes a portion 200A having a reservation bandwidth that is reserved and thus unavailable for transmissions external to reserved channel 210.
  • the remaining, unreserved portion 200B may be used for allocating other channels.
  • the unreserved portion 200B is reduced by a corresponding amount.
  • reserved channel 210 has a reserved bandwidth (RBW) that, when allocated, is removed from availability for transmissions external to transmissions made over reserved channel 210.
  • RBW reserved bandwidth
  • a best effort channel 220 may be allocated upon a request identified as a best effort request. Allocation of best effort channel 220 may be limited to an upper bandwidth limit and may be preempted by other channel allocations. Best effort channel classes may include various sub-classes that allow preemption of other, lower-subclasses of best effort channels.
  • the present invention provides a modification to a reserved channel class, and channels allocated according to the teachings herein are referred to as a dynamic reserved channels, and has a resizable reserved bandwidth. The bandwidth of a dynamic reserved channel is resizable based upon the dynamic reserved channel utilization.
  • Statically allocated reserved channels frequently result in under-utilization of medium 200 resources. Often, a reserved channel may have no transmissions made therethrough.
  • a reserved channel may be carrying transmissions that only consume a fraction of the bandwidth reserved therefore.
  • Lower priority requests are often denied, or alternatively granted at a lower bandwidth, although medium 200 is carrying data at a portion of the overall capacity thereof due to reserved channel allocations that are under-utilized.
  • the dynamic reserved channel class improves capacity utilization of a medium by allowing portions of the bandwidth of a dynamic reserved channel 230 to be "borrowed" by reservation of additional channels based upon an observed utilization of the dynamic reserved channel thereby reducing the size of the bandwidth allocated from a medium's unreserved bandwidth.
  • FIGURE 3 A there is illustrated communication medium 200 having reserved channel 210 allocated therein.
  • Medium 200 has a maximum bandwidth capacity of BWC.
  • Reserved channel 210 is statically allocated and has a reservation bandwidth of BWRl. Accordingly, the unreserved bandwidth (Bu) is equal to the bandwidth capacity (BWC) of medium 200 less the reserved bandwidth of channel 210.
  • Bu thus represents the available capacity of channel 210 that may be used for allocating another reserved channel or lower priority best effort channel allocations.
  • medium 200 after another reserved channel 211 having a reservation bandwidth of BWR2 has been allocated.
  • Bu represents the available bandwidth capacity of medium 200 that may be allocated for additional reserved channels or other lower priority best effort channels. Allocation of reserved channels and/or best effort channels may continue until the bandwidth capacity of medium 200 is consumed by the totality of the bandwidth of all channel allocations.
  • FIGURE 4A there is illustrated medium 200 with reserved channels 210 and 211 each having a respective reserved bandwidth BWRl and BWR2 allocated thereon and including a representation of an exemplary utilization of channels 210 and 211.
  • Prior art techniques for channel allocations include static reservations and best effort channel allocations. When a channel is allocated that has a statically reserved bandwidth, that particular bandwidth is effectively removed from the available capacity of the medium regardless of the usage thereof. For example, allocation of channel 210 removes a bandwidth BWRl from the available capacity of medium 200. This bandwidth is reserved and unusable by other channels regardless of the usage of channel 210. For example, the actual throughput of channel 210 may at any time range from zero up to the reserved bandwidth BWRl.
  • channel 210 has an actual observed usage bandwidth (Bol) -210A that is less than the reserved bandwidth BWRl. Allocation of another channel 211 then reduces the available medium 200 capacity by an additional amount equivalent to its reserved bandwidth BWR2 regardless of the actual utilization, or observed bandwidth (Bo2), 211 A thereof.
  • a result of static allocations of reserved channels is often an under- utilization of medium 200 capacity.
  • the combined observed bandwidths (Bol and Bo2) of reserved channels 210 and 211 may be a fraction of the combined reserved bandwidths (BWRl and BWR2) that is removed from the overall available unreserved bandwidth Bu of medium 200.
  • the present invention defines a new class of service referred to as a dynamic reserved channel that may "borrow" allocated capacity from another dynamic reserved channel and "loan" reserved bandwidth to another dynamic reserved channel based upon the utilization of a reserved bandwidth of the dynamic reserved channel.
  • FIGURE 4B there is illustrated medium 200 having a dynamic reserved channel 250 allocated therein according to the teachings of the invention.
  • Medium 200 has a total bandwidth capacity of BWC.
  • Dynamic reserved channel 250 is allocated and has a reserved bandwidth of BWRl.
  • An observed bandwidth (Bol) is monitored and provides a measurement of the utilization of dynamic reserved channel 250.
  • an evaluation of any unused reserved bandwidth (referred to herein as Bx) of any other dynamic reserved channel is made.
  • dynamic reserved channel 250 has a bandwidth of (BWRl - Bol) that is reserved but unused. This unused reserved bandwidth (Bx) may then be "loaned" to dynamic reserved channel 251 upon request for a bandwidth reservation for allocation of channel 251.
  • dynamic reserved channel is said to "borrow" the Bx, or a portion thereof, of channel 250. This is figuratively illustrated by the overlap between dynamic reserved channels 250 and 251. If the requested bandwidth for dynamic reserved channel 251 exceeds the Bx of dynamic reserved channel 250, an additional reservation of bandwidth from medium 200 capacity may be made in the amount the requested allocation exceeds the available Bx.
  • dynamic reserved channel 251 has a reserved bandwidth of BWR2 and, thus, an amount BWR2 - (BWRl-Bol) is newly reserved from the available unreserved bandwidth capacity of medium 200 (referred to herein as Bu) that, in addition to the Bx of channel 250, fulfills the requested bandwidth BWR2 of channel 251 allocation. If, on the other hand, the requested bandwidth BWR2 for allocation of dynamic reserved channel 251 is less than the Bx of dynamic reserved channel 250, the entirety of channel 251 may be allocated within the Bx of dynamic reserved channel 250.
  • Medium 300 of the present example has a bandwidth capacity (BWC) of 2000 Mb/s. Accordingly, prior to allocating any channels on medium 300, an unreserved bandwidth of 2000 Mb/s exists on medium 300 (cell A2).
  • BWC bandwidth capacity
  • various tracking variables that facilitate resizing of links are maintained within the network that includes medium 300 and, accordingly, an unreserved bandwidth tracking variable Bu indicates 2000 Mb/s of unreserved bandwidth existing on medium 300.
  • the various tracking variable may be maintained by a management node such as MCS 30.
  • An allocation request for dynamic reserved channel 310 of 500 Mb/s is first requested (cell Bl) and made (cell B4).
  • Cell B6 indicates that the entirety of the allocation for the dynamic reserved channel was made from the unreserved bandwidth (Bu) and is further clarified by cell B7 that indicates the change in Bu, in this case by -500 Mb/s.
  • the allocated bandwidth of dynamic reserved channel 310 may be resized according to a monitored utilization of channel 310 as summarized by column C of TABLE A.
  • the dynamic reserved channel has an observed bandwidth (Bo) 310A of 200 Mb/s (cell C13), or a utilization of 40% (cell C12) and thus an unused reserved bandwidth (Bx) of 300 Mb/s (cells C3 and C14) across medium 300 exists.
  • the monitored utilization may be obtained by various usage metrics periodically obtained by an MCS in communication with one or more of the nodes terminating medium 300.
  • a request for allocation of another dynamic reserved channel 311 having a reserved bandwidth of 100 Mb/s is made (cell Dl).
  • An evaluation of the unused reserved bandwidth is made and indicates an unused reserved bandwidth of 200 Mb/s (cell D3) exists in medium 300.
  • the entirety of the requested 100 Mb/s of bandwidth of the second channel may be borrowed (cell D5) from the unused reserved bandwidth Bx (as illustratively denoted by cross-hatches).
  • An accumulation of the requested reserved bandwidth is calculated (cell D4) and includes the 500 Mb/s of bandwidth requested for channel 310 and the 100 Mb/s of bandwidth requested for channel 311.
  • the accumulation of the requested bandwidth is 600 Mb/s although, due to the bandwidth borrowing mechanism of the invention, only 500 Mb/s of bandwidth has been allocated from medium 300 unreserved capacity (cell D6).
  • An accumulation of the borrowed bandwidth is made and is indicated by cell D8 to be 100 Mb/s.
  • a bandwidth request for allocation of a channel may be fulfilled by bandwidth that has previously been reserved but that has been determined to be unused.
  • a tracking variable is preferably employed that monitors the accumulated amount of bandwidth that has been determined to be reserved but unused and subsequently included in allocation of an additional channel/s. This tracking variable is designated TB in TABLE A.
  • allocation of another dynamic reserved channel 312 having a bandwidth of 400 Mb/s is made (cell El).
  • An analysis of the unused reserved bandwidth Bx indicates that, prior to allocation of channel 312, 200 Mb/s of unused reserved bandwidth remains (cell D3).
  • allocation of the channel 312 includes borrowing the remaining 200 Mb/s (as illustratively denoted by cross-hatches and an increment of 200 Mb/s of tracking variable TB) of unused reserved bandwidth from channel 310 resulting in zero unused reserved bandwidth (cell E3).
  • the remaining 200 Mb/s required to fulfill the bandwidth request for allocation of channel 312 is allocated from the unreserved bandwidth of medium 300 resulting in a 200 Mb/s decrement from the unreserved bandwidth (Bu) (cell E7) and results in 1300 Mb/s of bandwidth remaining that is unreserved (cell E2).
  • the reserved channel bandwidth tracking variable (R) is incremented by 400 Mb/s upon allocation of channel 312 and results in a total bandwidth of 1000 Mb/s cumulatively reserved for the channel class although only 700 Mb/s of medium 300 capacity has been physically allocated (cell E6).
  • channel resizing is again performed and includes analyzing channel utilization of allocated channels 310-312.
  • an observed bandwidth indicates that 500 Mb/s of bandwidth is being utilized (cell F13), that is a 50% utilization of the 1000 Mb/s of reserved bandwidth (cell F12) of all allocated channels as illustrated in FIGURE 5D.
  • a total of 700 Mb/s of allocated bandwidth has thus far been made on medium 300 (cell FI 1).
  • an observed bandwidth Bo of 500 Mb/s indicates that 200 Mb/s of bandwidth has been physically allocated but is not being utilized (cells F3 and F14).
  • a request for deallocation of channel 310 is next made that deletes channel 310 from medium 300 and includes a corresponding decrease of 500 Mb/s of reserved bandwidth on medium 300 (cell Gl).
  • the resulting unreserved bandwidth of medium 300 is 1500 Mb/s (cell G2).
  • the total reserved bandwidth for the remaining allocated channels 311 and 312 is 500 Mb/s (cell G4) which is fully allocated from medium 300 capacity, that is none of the reserved bandwidth is borrowed after deallocation of channel 310 (cell G5).
  • the bandwidth that has been borrowed is recovered by the remaining allocated links before any bandwidth of a channel being deallocated is returned to the unused capacity of medium 300.
  • the allocation of channels is limited to bandwidth reservations not to exceed the bandwidth capacity of the medium 300 regardless of the amount of bandwidth that is available for borrowing.
  • one or more links having an increase in the utilization thereof that have previously been determined to be underutilized and subsequently resized by loaning bandwidth thereof to another channel may be resized by re-appropriating loaned bandwidth from a link borrowing bandwidth to a link that has loaned bandwidth.
  • a tracking variable may be used to maintain a record of the total bandwidth requests (R) of channels as they are allocated.
  • This tracking variable records only the initial bandwidth request made when allocating a particular channel and does not increase or decrease as bandwidth is borrowed or loaned to other channels. Accordingly, the value of the total bandwidth requested tracking variable preferably does not exceed the bandwidth capacity of medium 300.

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

Abstract

L'invention concerne un procédé permettant d'attribuer et de redimensionner une liaison dans un support de communication. L'utilisation d'une liaison attribuée est surveillée et une largeur de bande inutilisée de celle-ci est déterminée. Sur demande d'attribution d'une deuxième liaison, au moins une partie de la largeur de bande inutilisée est comprise dans la largeur de bande de la deuxième liaison attribuée. Selon cette invention, un réseau comprenant deux noeuds et un support de communication terminé par ces noeuds peut fournir une pluralité de liaisons de communication et peut redimensionner la largeur de bande des liaisons attribuée. Ce réseau peut surveiller l'utilisation d'une largeur de bande attribuée d'une liaison attribuée, et libérer une partie de la largeur de bande attribuée qui est inutilisée par la liaison attribuée. La largeur de bande libérée, ou une partie de celle-ci, peut ensuite être comprise dans une attribution de largeur de bande destinée à une liaison supplémentaire.
PCT/US2002/017378 2001-06-01 2002-05-31 Systeme et procede permettant de redimensionner la largeur de bande d'une liaison physique en fonction de l'utilisation de celle-ci WO2002099574A2 (fr)

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AU2002345566A AU2002345566A1 (en) 2001-06-01 2002-05-31 System and method for resizing the physical link bandwidth based on utilization thereof

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US29514601P 2001-06-01 2001-06-01
US60/295,146 2001-06-01

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WO2002099574A3 WO2002099574A3 (fr) 2009-06-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2905553A1 (fr) * 2006-09-06 2008-03-07 Alcatel Sa Procede de gestion d'une telecommunication sans fil et interface d'acces a un reseau de telecommunication mettant en oeuvre un tel procede
WO2011032315A1 (fr) * 2009-09-17 2011-03-24 Huawei Technologies Co.,Ltd. Redimensionnement sans à-coups dynamique dans des réseaux de transport optique

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US3456044A (en) * 1965-03-12 1969-07-15 Heinz Erich Pahlke Biaxial orientation
US4551380A (en) * 1984-05-10 1985-11-05 W. R. Grace & Co., Cryovac Div. Oriented heat-sealable multilayer packaging film
US5434010A (en) * 1988-12-19 1995-07-18 Viskase Corporation Heat shrinkable very low density polyethylene terpolymer film
US5904964A (en) * 1989-12-18 1999-05-18 E. I. Du Pont De Nemours And Company Process for manufacturing heat-shrinkable polyethylene film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456044A (en) * 1965-03-12 1969-07-15 Heinz Erich Pahlke Biaxial orientation
US4551380A (en) * 1984-05-10 1985-11-05 W. R. Grace & Co., Cryovac Div. Oriented heat-sealable multilayer packaging film
US5434010A (en) * 1988-12-19 1995-07-18 Viskase Corporation Heat shrinkable very low density polyethylene terpolymer film
US5904964A (en) * 1989-12-18 1999-05-18 E. I. Du Pont De Nemours And Company Process for manufacturing heat-shrinkable polyethylene film

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2905553A1 (fr) * 2006-09-06 2008-03-07 Alcatel Sa Procede de gestion d'une telecommunication sans fil et interface d'acces a un reseau de telecommunication mettant en oeuvre un tel procede
EP1898573A1 (fr) * 2006-09-06 2008-03-12 Alcatel Lucent Procédé de gestion d'une communication sans-fil et interface d'accès à un réseau de communication mettant en oeuvre un tel procédé
WO2011032315A1 (fr) * 2009-09-17 2011-03-24 Huawei Technologies Co.,Ltd. Redimensionnement sans à-coups dynamique dans des réseaux de transport optique
CN102239651A (zh) * 2009-09-17 2011-11-09 华为技术有限公司 光传送网中的动态无损调整
JP2013504952A (ja) * 2009-09-17 2013-02-07 ホアウェイ・テクノロジーズ・カンパニー・リミテッド 光伝送ネットワークにおける動的でヒットレスなリサイジング
AU2009352636B2 (en) * 2009-09-17 2014-02-20 Huawei Technologies Co., Ltd. Dynamic hitless resizing in optical transport networks
AU2009352636C1 (en) * 2009-09-17 2014-10-09 Huawei Technologies Co., Ltd. Dynamic hitless resizing in optical transport networks
US8886040B2 (en) 2009-09-17 2014-11-11 Huawei Technologies Co., Ltd. Dynamic hitless resizing in optical transport networks
US9531492B2 (en) 2009-09-17 2016-12-27 Huawei Technologies Co., Ltd. Dynamic hitless resizing in optical transport networks
US10237009B2 (en) 2009-09-17 2019-03-19 Huawei Technologies Co., Ltd. Dynamic hitless resizing in optical transport networks

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Publication number Publication date
AU2002345566A8 (en) 2009-07-30
WO2002099574A3 (fr) 2009-06-18
AU2002345566A1 (en) 2002-12-16

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