CN1426189A - Distributive wavelength reserving method - Google Patents

Distributive wavelength reserving method Download PDF

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Publication number
CN1426189A
CN1426189A CN03100604A CN03100604A CN1426189A CN 1426189 A CN1426189 A CN 1426189A CN 03100604 A CN03100604 A CN 03100604A CN 03100604 A CN03100604 A CN 03100604A CN 1426189 A CN1426189 A CN 1426189A
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wavelength
node equipment
reservation
detection packet
wset
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CN03100604A
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CN100372273C (en
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郑小平
奉飞飞
张汉一
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Tsinghua University
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Tsinghua University
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Abstract

A distributed wavelength preservation method relates to the setting up of distributed dynamic wavelength route in automatic exchanging light network characterizing in sending a preserve-detection packet to host node equipment direction after source node equipment receives requirement of connection, containing local used wavelength list and a w set selected from it, every middle node equipment renews the wavelength list on one hand, and preserves w set on the other, if w set can be used at each node equipment then w set matches each light node equipment, otherwise the host node equipment selects a wavail from the renewed wavelength list to send a preserved signaling packet to the source and each middle node equipment matches relates wavail to set up light channel.

Description

A kind of distributed wavelength method for obligating
Technical field
A kind of distributed wavelength method for obligating belongs to the optical communication technology field, the particularly foundation of distributed dynamic wavelength route in the ASON.
Background technology
The optical-fiber network that adopts optical node technology and close wavelength-division multiplex technology to constitute has been acknowledged as the basis of communication network.Optical Add Drop Multiplexer (OADM) is two kinds of typical optical node devices with optical cross connect (OXC).Utilize this two kinds of equipment, can set up a transparent optical channel between the sourcesink node of Business Stream.Network electronic devices " electronic bottleneck " problem has been eliminated in the foundation of optical channel.For supporting the characteristic of data traffic burst, optical channel should dynamically be established or be removed as required, therefore needs online signaling protocol that wavelength resource is reserved/discharged.A little less than considering that centralized Wavelength reservation agreement extensibility and survivability ability are, distributed Wavelength reservation will become the developing direction of optical network resource method for obligating.
Present disclosed distributed wavelength method for obligating can be divided into two big classes, and a class is that forward direction is reserved; One class is that the back is to reservation.
The forward direction method for obligating can be expressed as:
1. after connection request arrived, source node equipment was along certain bar signalling path, and hop-by-hop sends to destination node equipment and reserves signaling packet (Resv), and this Resv bag has carried source node equipment wavelength available information table AvailSet.
2. after each intermediary device is received Resv, check link-local information, obtain the wavelength available of current connection upstream and downstream node device, compare with the AvailSet that receives, deletion wherein belongs to local disabled wavelength.Then the Resv after upgrading is forwarded to the downstream node equipment of signalling path.Local optical node device carries out following operation simultaneously: local wavelength available is reserved; Upstream nodes equipment sends release signaling bag (Rls).Comprised the unavailable wavelength information of local node equipment among the Rls.Upstream node equipment is received Rls, discharges unavailable wavelength among the Rls that has reserved.
3. destination node equipment is received Resv, checks wavelength available information table AvailSet.If wavelength available is arranged among the AvailSet, destination node equipment is chosen a wavelength from AvailSet, and the opposite direction of transmitting along Resv, send one to source node equipment and confirm signaling (Conf), notify upstream node equipment with selected wavelength configuration optical node device separately on the one hand, allow upstream node equipment be released to this optical channel on the other hand and set up other shared unnecessary wavelength.
4. after source node equipment is received Conf, agree this connection request.
5. in 2,3 processes, if do not have wavelength available among intermediary device or the destination node device discovery AvailSet, this node device will send a signaling packet (NACK) of representing connection failure toward source node equipment along the opposite direction of Resv signaling, receive that the optical node device of NACK is released to the wavelength that connection this time keeps on the one hand; Transmit this NACK until source node equipment toward the upstream node device on the other hand.
The back can be described as to method for obligating:
1. after connection request arrived, source node equipment was along certain bar signalling path, and hop-by-hop sends to destination node equipment and surveys signaling packet (Prob), and this Prob bag has carried source node equipment wavelength available information table AvailSet.
2. after each intermediary device is received Prob, check link-local information, obtain the wavelength available of current connection upstream and downstream node device, compare with the AvailSet that receives, deletion wherein belongs to local disabled wavelength.Then the Prob after upgrading is forwarded to the downstream node equipment of signalling path.
3. after destination node equipment is received Prob, check AvailSet, if wavelength available is arranged among the AvailSet, destination node equipment is therefrom selected a wavelength available subclass ResvSet, and the opposite direction that sends along the Prob signaling sends the reservation signaling packet (Resv) that comprises this subclass to source node equipment.
4., therefrom select a wavelength to carry out data and transmit if source node equipment is received Resv; Simultaneously send a release signaling bag (Rls) along Prob signaling sending direction, the notice intermediary device discharges other wavelength resource among the ResvSet.
5. in process 3,4, wavelength among the wavelength subclass ResvSet that intermediary device is sent the destination node device orientation is reserved, if certain intermediary device finds that certain wavelength is no longer available among the ResvSet, then this wavelength is deleted from ResvSet, send Rls to the destination node device orientation simultaneously, notify its downstream node equipment to discharge this wavelength resource; If certain intermediary device finds not had wavelength available among the ResvSet, send Rls to the destination node device orientation on the one hand, notify its downstream node equipment to be released to this passage and set up the wavelength resource of being reserved; Send the NACK signaling packet of connection failure on the other hand to source node equipment.
When using the forward direction method for obligating, it is short that optical channel connects the average time of setting up, but the blocking rate height of network; Use the back when method for obligating, it is long that optical channel connects the average time of setting up, but the blocking rate of network is low.
The average time that optical channel is set up, short low blocking rate with network was two important indicators that optical-fiber network is pursued.Particularly work as network and break down, when needing to trigger certain survivability mechanism, above-mentioned two indexs are particularly important.
Summary of the invention
The objective of the invention is to solve the deficiencies in the prior art, propose a kind of low light network blocking probability that has, low optical channel is set up the distributed wavelength method for obligating of average time.
The invention discloses a kind of distributed wavelength method for obligating, this method comprises the establishment step of optical channel between the sourcesink node device, it is characterized in that the execution as follows between optical node device of this method:
1) after source node equipment is received connection request, sends reservation-detection packet to the destination node device orientation; Described reservation-detection packet comprises the wavelength available table of source node equipment and picked at random goes out from described wavelength available table a wavelength, and described wavelength is labeled as Wset, and its availability is labeled as flag, and flag is changed to l;
2) after each intermediary device is received reservation-detection packet, check link-local information, obtain the wavelength available of the downstream node equipment of current connection, compare with the wavelength table of receiving, deletion wherein belongs to local disabled wavelength, upgrades the wavelength available table in the reservation-detection packet; Check the availability mark flag of the wavelength Wset in reservation-detection packet that receives simultaneously, if flag=1 then carries out this locality to wavelength Wset and reserves; If flag=0 does not then carry out this locality to wavelength Wset and reserves;
If described wavelength Wset reserves successfully in intermediary device, the reservation-detection packet after then intermediary device will be upgraded is forwarded to downstream node equipment separately; Destination node equipment is received reservation-detection packet, after being checked through flag=l, the opposite direction that destination node equipment sends along reservation-detection packet, send the affirmation bag to source node equipment, notice upstream node equipment wavelength Wset configuration optical node device separately, after source node equipment is received configuration successful message, agree this request, thereby set up optical channel;
If described wavelength Wset does not reserve success in certain intermediary device, then this node device is changed to 0 with the availability mark flag of wavelength Wset, together with the wavelength available table after upgrading according to local wavelength available situation, form reservation-detection packet, mail to downstream node equipment; Along the opposite direction of reservation-detection packet transmission, upstream nodes equipment sends the release signaling bag simultaneously, and notice upstream node equipment discharges wavelength Wset resource; Destination node equipment is received reservation-detection packet, after being checked through flag=0, reexamine wavelength table, if wavelength available is arranged in the wavelength table, then destination node equipment is therefrom selected a wavelength available, described wavelength is labeled as Wavail, and the opposite direction along reservation-detection packet sends sends the reservation signaling packet to source node equipment; Upstream node equipment is transmitted the reservation signaling packet on the one hand, on the one hand wavelength Wavail is reserved, if upstream node equipment is reserved successfully wavelength Wavail, then send and confirm bag toward source node equipment, if reserve unsuccessful, send unsuccessful message to source node equipment on the one hand, notify downstream node equipment to discharge wavelength Wavail resource on the one hand; Source node equipment is received and is confirmed bag, agrees this request, thereby set up optical channel; Source node equipment is received and is sent unsuccessful message, then refuses this connection request.
The present invention has network blocking probability characteristic preferably, and link establishment simultaneously is shorter average time, is applicable to the quick foundation of optical channel in the ASON of future generation (ASON).
Description of drawings
Fig. 1 is the Wavelength reservation process schematic diagram of the embodiment of the invention.
Fig. 2 is the realization software flow pattern that will solidify required for the present invention for optical node device.
Fig. 3 is the blocking rate characteristic comparison diagram of existing method and the inventive method.
Fig. 4 is the average link characteristic settling time comparison diagram (3 jump) of existing method and the inventive method.
Embodiment
As shown in Figure 1, the optical node device of embodiment of the invention employing is the optical cross-connection equipment (OXC) or the dropinsert MUX (OADM) of optical communication branch company of Datang Telecom development.Described equipment is all supported LMP Link Manager Protocol, and has all comprised signaling receiver module, signaling forwarding module and signaling processing module.The various bags that sent in the embodiment of the invention are all finished by the signaling forwarding module in the described equipment, and the reception of various bags is all finished by the signaling receiver module in the described equipment; Processing to various bags is all finished by the signaling processing module in the described equipment.The various bags that sent in the embodiment of the invention are all based on ICP/IP protocol.
Fig. 2 is the realization software flow pattern that will solidify required for the present invention for optical node device, and as shown in Figure 2, optical node device is being safeguarded local wavelength available collection { x} under the support of link-state protocol.After signaling receipts module is sent the process trigger message here, at first judge the type of this information.Here type of message has following a few class: connection request, the reservation-detection packet of upstream (RESV PROB), the release signaling bag (RLS) of upstream, the unsuccessful message (NACK) in downstream, the affirmation bag (CONF) in downstream, downstream reservation signaling packet (RESV).Wherein the connection request type of message has guaranteed that all node devices in the network can serve as the source node equipment of connection request; When node device receive upstream messages (RESV_PROB, RLS) after, judge according to the device number of destination node whether this equipment is place equipment; When node device receive downstream message (NACK, CONF, RESV) after, judge according to the device number of source node whether this equipment is source device.Each equipment is correspondingly processed according to information type.
The present invention implements as follows:
1) after source node equipment O1 receives connection request, send reservation-detection packet to destination node equipment O6 direction, the wavelength that described reservation-detection packet (RESV_PROB) comprises local wavelength available table (AvailList), picked at random goes out from local wavelength available table is labeled as Wset with described wavelength and availability mark flag is changed to 1; As 11 processes among Fig. 1.
2) after each intermediary device (O2, O3, O4, O5) is received reservation-detection packet, obtain the wavelength available of the downstream node equipment of current connection by LMP Link Manager Protocol, compare with the AvailList that receives, deletion wherein belongs to local disabled wavelength, upgrades AvailList.Check the availability mark flag of the wavelength Wset in reservation-detection packet that receives simultaneously, if flag=1 then carries out this locality to wavelength Wset and reserves; If flag=0 does not then carry out this locality to wavelength Wset and reserves.
If described wavelength Wset reserves successfully in intermediary device, the RESV_PROB after then intermediary device will be upgraded is forwarded to downstream node equipment separately.As 12 among Fig. 1,13,14,15 processes.Destination node equipment is received reservation-detection packet, after being checked through flag=1, the opposite direction that destination node equipment sends along reservation-detection packet, send affirmation bag (CONF) to source node equipment, notice upstream node equipment wavelength Wset configuration optical node device separately, after source node equipment is received configuration successful message, agree this request, thereby set up optical channel; As 21 among Fig. 1,22,23,24,25 processes.
If described wavelength Wset does not reserve success at intermediary device O4, then intermediary device O4 is changed to 0 with the availability mark flag of wavelength Wset, AvailList together with after upgrading according to local wavelength available situation forms reservation-detection packet, mails to downstream node equipment; As among Fig. 1 311,312.Along the opposite direction of reservation-detection packet transmission, upstream nodes equipment sends release signaling bag (RLS) simultaneously, and notice upstream node equipment discharges wavelength Wset resource; As scheme 321,322,323 processes among the l.Destination node equipment is received reservation-detection packet, after being checked through flag=0, reexamine AvailList, if wavelength available is arranged among the AvailList, destination node equipment is therefrom selected a wavelength available, described wavelength is labeled as Wavail, and the opposite direction along reservation-detection packet sends sends reservation signaling packet (RESV) to source node equipment; Upstream node equipment is transmitted RESV on the one hand, as 41,42,43,44,45 processes among Fig. 1, on the one hand wavelength Wavail is reserved; If node device is reserved successfully wavelength Wavail, then send and confirm bag (CONF), as 51,52,53,54,55 processes among Fig. 1 toward source node equipment.If node device O3 reserves unsuccessful, send unsuccessful message (NACK) to source node equipment O1 on the one hand, as 611 among Fig. 1,612 processes, notify downstream node equipment to discharge wavelength Wavail resource on the one hand; As 621,622,623 processes among Fig. 1.Source node equipment is received CONF, agrees this request, thereby sets up optical channel; Receive NACK, refuse this connection request.
Fig. 3 is the blocking rate characteristic comparison diagram of U.S.'s natural science fund network of being simulated under three kinds of methods, curve 1 is the blocking rate characteristic curve of forward direction method for obligating, curve 2 is the blocking rate characteristic curve of back to method for obligating, curve 3 is the blocking rate characteristic curve of the method for the invention, can see that method of the present invention has minimum network blocking probability when network payload during less than 0.1Erlang.For example when network payload was 1E-3, the blocking rate of forward direction method for obligating lower network was greater than 10 -4, the back to method for obligating greater than 10 -5, and of the present invention less than 10 -6Therefore, the present invention has best network blocking probability characteristic in the underloading net.
Fig. 4 is the average link characteristic settling time comparison diagram of three kinds of methods, and curve 1 is the link establishment average time of forward direction method for obligating, and curve 2 is back to the link establishment average time of method for obligating, and curve 3 is the link establishment average time of the method for the invention.Can see, when network payload lower (<0.1Erlang) (underloading net situation) time, adopt the method for the invention can obtain splendid link establishment average time; When network payload greater than 0.1Erlang the time, the link establishment of the method for the invention is longer than the summary of forward direction method for obligating average time, but is shorter than the back to method for obligating.
The present invention is applicable to the quick foundation of optical channel in the ASON of future generation.

Claims (1)

1. distributed wavelength method for obligating, this method comprises the establishment step of optical channel between the sourcesink node device, it is characterized in that this method carries out between optical node device as follows:
1) after source node equipment is received connection request, sends reservation-detection packet to the destination node device orientation; Described reservation-detection packet comprises the wavelength available table of source node equipment and picked at random goes out from described wavelength available table a wavelength, and described wavelength is labeled as Wset, and its availability is labeled as flag, and flag is changed to 1;
2) after each intermediary device is received reservation-detection packet, check link-local information, obtain the wavelength available of the downstream node equipment of current connection, compare with the wavelength table of receiving, deletion wherein belongs to local disabled wavelength, upgrades the wavelength available table in the reservation-detection packet; Check the availability mark flag of the wavelength Wset in reservation-detection packet that receives simultaneously, if flag=1 then carries out this locality to wavelength Wset and reserves; If flag=0 does not then carry out this locality to wavelength Wset and reserves;
If described wavelength Wset reserves successfully in intermediary device, the reservation-detection packet after then intermediary device will be upgraded is forwarded to downstream node equipment separately; Destination node equipment is received reservation-detection packet, after being checked through flag=1, the opposite direction that destination node equipment sends along reservation-detection packet, send the affirmation bag to source node equipment, notice upstream node equipment wavelength Wset configuration optical node device separately, after source node equipment is received configuration successful message, agree this request, thereby set up optical channel;
If described wavelength Wset does not reserve success in certain intermediary device, then this node device is changed to 0 with the availability mark flag of wavelength Wset, together with the wavelength available table after upgrading according to local wavelength available situation, form and reserve a detection packet, mail to downstream node equipment; Along the opposite direction of reservation-detection packet transmission, upstream nodes equipment sends the release signaling bag simultaneously, and notice upstream node equipment discharges wavelength Wset resource; Destination node equipment is received reservation-detection packet, after being checked through flag=0, reexamine wavelength table, if wavelength available is arranged in the wavelength table, then destination node equipment is therefrom selected a wavelength available, described wavelength is labeled as Wavail, and the opposite direction along reservation-detection packet sends sends the reservation signaling packet to source node equipment; Upstream node equipment is transmitted the reservation signaling packet on the one hand, on the one hand wavelength Wavail is reserved, if upstream node equipment is reserved successfully wavelength Wavail, then send and confirm bag toward source node equipment, if reserve unsuccessful, send unsuccessful message to source node equipment on the one hand, notify downstream node equipment to discharge wavelength Wavail resource on the one hand; Source node equipment is received and is confirmed bag, agrees this request, thereby set up optical channel; Source node equipment is received and is sent unsuccessful message, then refuses this connection request.
CNB031006043A 2003-01-17 2003-01-17 Distributive wavelength reserving method Expired - Fee Related CN100372273C (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7266295B2 (en) 2003-04-17 2007-09-04 Intel Corporation Modular reconfigurable multi-server system and method for high-speed networking within photonic burst-switched network
US7272310B2 (en) 2003-06-24 2007-09-18 Intel Corporation Generic multi-protocol label switching (GMPLS)-based label space architecture for optical switched networks
US7310480B2 (en) 2003-06-18 2007-12-18 Intel Corporation Adaptive framework for closed-loop protocols over photonic burst switched networks
WO2009030154A1 (en) * 2007-08-27 2009-03-12 Huawei Technologies Co., Ltd. Distributed wavelength conversion control for signaling protocols
US7526202B2 (en) 2003-05-19 2009-04-28 Intel Corporation Architecture and method for framing optical control and data bursts within optical transport unit structures in photonic burst-switched networks
US7734176B2 (en) 2003-12-22 2010-06-08 Intel Corporation Hybrid optical burst switching with fixed time slot architecture
US7848649B2 (en) 2003-02-28 2010-12-07 Intel Corporation Method and system to frame and format optical control and data bursts in WDM-based photonic burst switched networks
US8660427B2 (en) 2002-09-13 2014-02-25 Intel Corporation Method and apparatus of the architecture and operation of control processing unit in wavelenght-division-multiplexed photonic burst-switched networks

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3600119B2 (en) * 2000-05-23 2004-12-08 日本電信電話株式会社 Optical channel setting and release method
US7289730B2 (en) * 2002-04-19 2007-10-30 Nippon Telegraph And Telephone Corporation Optical path communication network, node, and optical path setup method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8660427B2 (en) 2002-09-13 2014-02-25 Intel Corporation Method and apparatus of the architecture and operation of control processing unit in wavelenght-division-multiplexed photonic burst-switched networks
US7848649B2 (en) 2003-02-28 2010-12-07 Intel Corporation Method and system to frame and format optical control and data bursts in WDM-based photonic burst switched networks
US7266295B2 (en) 2003-04-17 2007-09-04 Intel Corporation Modular reconfigurable multi-server system and method for high-speed networking within photonic burst-switched network
US7526202B2 (en) 2003-05-19 2009-04-28 Intel Corporation Architecture and method for framing optical control and data bursts within optical transport unit structures in photonic burst-switched networks
US7310480B2 (en) 2003-06-18 2007-12-18 Intel Corporation Adaptive framework for closed-loop protocols over photonic burst switched networks
US7272310B2 (en) 2003-06-24 2007-09-18 Intel Corporation Generic multi-protocol label switching (GMPLS)-based label space architecture for optical switched networks
US7734176B2 (en) 2003-12-22 2010-06-08 Intel Corporation Hybrid optical burst switching with fixed time slot architecture
WO2009030154A1 (en) * 2007-08-27 2009-03-12 Huawei Technologies Co., Ltd. Distributed wavelength conversion control for signaling protocols
US8145056B2 (en) 2007-08-27 2012-03-27 Futurewei Technologies, Inc. Distributed wavelength conversion control for signaling protocols
US8774626B2 (en) 2007-08-27 2014-07-08 Futurewei Technologies, Inc. Distributed wavelength conversion control for signaling protocols

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