CN1512683A - An Optical Wavelength Switching Method Based on Synchronous Time Slots in the Whole Network - Google Patents
An Optical Wavelength Switching Method Based on Synchronous Time Slots in the Whole Network Download PDFInfo
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Abstract
基于全网同步时隙的光波长交换方法，属于光网络中传输数据的光通道连接配置的一种方法。主要特征是采用以最小交换连接单位为光时隙的业务传送机制，全网所有节点在一个统一的时隙同步下根据各个相应时隙的出入端口连接配置表进行光通道的交叉连接指配，边缘的用户网络接口依相应的业务时隙映射表传送业务。本发明解决了已有技术基于波长进行交叉连接和路由等存在的问题，使网络资源得以更充分的利用，提高光网络通道指配的灵活性，降低了网络阻塞率，对设备性能的要求也不过高，更加实用可靠。
The optical wavelength switching method based on the synchronous time slot of the whole network belongs to a method of optical channel connection configuration for transmitting data in an optical network. The main feature is that it adopts the service transmission mechanism with the smallest switching connection unit as the optical time slot. All nodes in the whole network perform cross-connection assignment of the optical channel according to the connection configuration table of the ingress and egress ports of each corresponding time slot under a unified time slot synchronization. The user network interface at the edge transmits services according to the corresponding service time slot mapping table. The present invention solves the existing problems of wavelength-based cross-connection and routing in the prior art, makes full use of network resources, improves the flexibility of optical network channel assignment, reduces the network blocking rate, and lowers the requirements for equipment performance. Not too high, more practical and reliable.
Description
Technical field
The invention belongs to the network technology category, is that the optical channel of transmission data in the optical-fiber network connects a kind of method that disposes.
Background technology
Be used at present in the all-optical network the light switching method comparatively reality have two kinds, a kind of is the circuit switching of wavelength route, promptly based on the ASON (ASON) that connects, another kind is light burst-switched (OBS).ASON (hereinafter to be referred as ASON) is to have introduced independently control plane to implement the dynamic-configuration connection management in optical-fiber network, thereby realizes and can come automatic dynamic assignment optical channel according to user's request.The core technology of ASON architecture comprises the signaling protocol of management such as being used for distributed establishment of connection, maintenance and dismounting; The Routing Protocol of routing service is provided for establishment of connection; And Link Resource Manager etc.In ASON, the connection in the light territory is divided into three classes: switch type connection, permanent connection, soft-permanent connect.The least unit of these three kinds of connections is all calculated with wavelength channel, and the flow that each user transmits on single wavelength in the real network is often much smaller than the maximum stream flow that single wavelength can carry, thereby this exchange connects the serious waste that unit has caused bandwidth; In addition, be limited to cost and traffic carrying capacity, the whole network has only node seldom can have the wavelength Conversion function, and each node is merely able to carry out limited wavelength channel interconnection, the obstruction that causes optical network service to provide easily so, network more flexible is also not enough.
Summary of the invention
The present invention will overcome the shortcoming that above-mentioned prior art exists, and provides and utilizes the optical wavelength switching method of signaling realization based on the whole network synchronization slot in a kind of optical internet, and this method can realize that connecting unit with the minimum exchange is the professional transfer mechanism in light time crack.
Technical scheme of the present invention is as follows:
Follow the universal law of ASON; as: optical-fiber network is made up of Optical Switch Node (OXC), service request node, User Network Interface (UNI); independently control aspect of network utilisation is implemented the dynamic-configuration connection management; need key-course to finish neighbours' discovery; service discovering, route is finished link setup, is torn chain open; protection is switched, Link Resource Manager or the like.
Feature of the present invention is, carrying out interconnection and route in the network, all to be based on each wavelength time slot be unit, Optical Switch Node (OXC) is to go out inbound port according to each time slot to connect allocation list configuration optical cross connect, what the business time-slot mapping table of the User Network Interface at edge (UNI) shone upon is the mapping relations of a certain output wavelength of professional and a certain time slot of UNI, and the present invention also needs Optical Switch Node is carried out the optical switch action regularly.Though signaling also adopts the system and the mechanism of ASON (ASON) and general multiprotocol label switching (GMPLS) basically, need carry out corresponding modification.
Method of the present invention is: all nodes of the whole network carry out the interconnection assignment of optical channel according to the inbound port connection allocation list that goes out of each corresponding time slot down synchronously a unified time slot, the User Network Interface at edge (UNI) transmits in time slot corresponding a certain business according to the business time-slot mapping table on wavelength, be the professional transfer mechanism of time slot thereby provide with minimum cross-over unit; Detailed process is as follows:
1) at first whole network is unified sets one period regular time and is spaced apart a time slot, and a plurality of time slot is an one-period;
2) switching node of each in the network inbound port that goes out that includes each time slot connects allocation list, total N connects allocation list, and loop cycle, the User Network Interface at edge (UNI) has flow business and the mapping table that is connected of corresponding light network slot, i.e. the business time-slot mapping table of each service request node; Link setup is torn the chain signaling open or the webmaster order is relevant in the renewal of these two forms and the network;
3) switching node in the network connects allocation list and disposes its optical cross connect at the inbound port that goes out of each time slot according to corresponding time slot, fringe node outputs to the corresponding business flow in the corresponding wavelength according to corresponding business time-slot mapping table at this time slot in the network, and in moment buffer memory business datum that these service traffics are not transmitted;
The route of the amended ASON of network using (ASON), link setup and tear chain open, and relevant signaling.Promptly all need be modified to the wavelength time slot is minimum request unit and cross-over unit.
For example at link setup with tear open in the chain signaling changing label corresponding to certain time slot of certain wavelength into corresponding to the label of wavelength originally, recognition of devices just goes out behind this label this time slot operations to this wavelength; Other signaling and to the processing of signaling all needs the label or the link circuit resource that replace with corresponding to the label of wavelength or link circuit resource corresponding to certain certain time slot of wavelength as signalings such as Link Resource Manager, route, protection recoveries.
All nodes of described the whole network carry out the interconnection assignment under a unified time slot is synchronous and transport service is, the User Network Interface (UNI) of all Optical Switch Nodes of the whole network (OXC) and network edge realizes that in the business that the unified time point carries out the optical switch switching action and changes wavelength transmission synchronous approach has two kinds: the one, and the clock that provides by the clock synchronizing network is to the equipment timing; Be that few and each Optical Switch Node internal clocking is directly exported to equipment regularly by each intra-node clock comparatively accurately under the situation at node again.
The beginning of each time slot, along with the change of optical fiber cross-connect configuration, then the virtual topology of optical-fiber network correspondingly changes; After each time slot begins the whole network unification and carries out interconnection and finish, could begin the transport service flow; User Network Interface and Optical Switch Node by the edge carry out statistic multiplexing to each time slot in the whole network one-period according to the size of each service traffics.
Major advantage of the present invention is: 1, be minimum applying unit and cross-over unit, make Internet resources be utilized more fully owing to providing with the wavelength time slot; And by User Network Interface each optical fiber time slot in the one-period is carried out statistic multiplexing according to the size of each service traffics, improved the utilance of network greatly at the edge; 2, can ask at each independent time slot to the various objectives destination edge node at the UNI of network edge node, just in the one-period source UNI can purpose of connecting UNI number can be more than the output wave long number of source UNI self, this all improves a lot the utilance of network and flexibility; 3,, thereby can reduce route significantly, the blocking rate during the protection recovery owing to be that unit is that unit makes the link channel number increase greatly than with the wavelength with the time slot; 4, to realizing that optical network device performance demands required for the present invention is low than light burst-switched (OBS).
Description of drawings
Fig. 1-1, Fig. 1-2 are respectively that wherein Fig. 1-1 is the connection of time slot 1 with the change schematic diagram of the Optical Switch Node the present invention that is example in different time-gap optical-fiber network logical topology, and Fig. 1-2 is the connection of time slot 2
Fig. 2 is the peculiar architecture logic schematic diagram of switching node in the network of the present invention
Fig. 3 is the peculiar function logic schematic diagram of User Network Interface (UNI) at edge of the present invention
Fig. 4 is that each time slot optical channel of the present invention is set up the sequential schematic diagram, among the figure 1. the connection of all Optical Switch Nodes of the whole network be configured in the S that each time slot begins and finish in the time; 2. all User Network Interface nodes current time slots according to time slot services mapping table transparent transmission business in corresponding wavelength, the time period that each wavelength can transport service in the high expression of the figure center line network, the low expression of line since switching node be not ready for cannot transport service time period; 3. at current point in time, the business of all User Network Interface node stop current time slots transmits, and all Optical Switch Nodes begin the connection configuration of next time slot.
Embodiment
Referring to Fig. 1-Fig. 4:
1) to realize that at first the User Network Interface (hereinafter to be referred as UNI) of all Optical Switch Nodes of the whole network (hereinafter to be referred as OXC) and network edge carries out the business of optical switch switching action and change wavelength transmission at the unified time point.Two approach are arranged, one is to come to equipment regularly by the clock that the clock synchronization network provides, another be at node under the few and comparatively accurate synchronously situation of each OXC internal clocking also when not required the clock synchronizing network clock is provided, and directly export to equipment regularly by each intra-node clock.
2) the unified time interval that to set every section time span be t of all optical network key-course is a time slot, and N time slot is one-period.Time slot in the whole network is synchronous, each equipment first time slot in the unified time point beginning cycle, and through becoming second time slot after the t time, process t * N finishes one-period and begins first time slot of second period, so circulation after the time.Describing as 1 synchronously of each equipment point unified time realizes.The business that OXC and UNl only can carry out the optical switch switching action and change wavelength transmission in the time that each time slot begins.In addition, the optical switch time the slowest in the ratio network that the time span of t is set is long, and long to can transmit the active data flow on wavelength.T * N in addition, promptly the time period of one-period should be in the tolerable time delay scope of transfer of data (if such as transmission be that t * N can establish longlyer so to the insensitive data service of time delay, such as the above magnitude of millisecond.If but transmission is analogous terms sound business, real-time multimedia business or to the data service of delay sensitive, so t * N just should establish the magnitude of 125 microseconds of similar SDH.Generally speaking in order to guarantee the transparent transmission to business, t * N should provide a less transfer delay), the numerical value of N should make t * N satisfy above-mentioned requirements.
3) the go out inbound port of the switching node of each in network with each time slot connects allocation list and (N connection allocation list should be arranged altogether promptly, and loop cycle), the connection allocation list of each time slot should comprise the corresponding relation that is connected of current time slots outbound port wavelength and inbound port wavelength.Carry out optical channel at the OXC at first of each time slot according to corresponding time slot allocation list control optical switch and connect assignment; and stipulate s that all OXC must be after time slot begins switch finish within the time period that (s is a guard time; its concrete time be with network in the slowest optical switch control time, the maximum time difference correlation between each node synchronised clock).
4) same, the professional mapping table that is connected with the corresponding light network slot of flow that the UNI node at edge has each service request node (is the business time-slot mapping table, also be N circulation), certain service traffics corresponding relation that the business time-slot mapping table of each time slot should comprise current time slots outbound port wavelength and will transmit on this wavelength.And begin and cross s according to the business time-slot mapping table corresponding service flow to be sent in the wavelength after the time at each time slot.The situation that does not arrive UNI constantly in its corresponding all the other that transmit time slot when service traffics then flow is buffered etc. to be sent.
5) each time slot goes out inbound port and connects writing of allocation list and business time-slot mapping table: the switching node in the optical-fiber network should according to the link setup signaling that receives with tear the chain signaling open in the information of the discrepancy wavelength port of the respective links that comprises and the timeslot number inbound port that goes out that changes corresponding time slot be connected allocation list.The UNI node at same edge is according to the link setup of receiving and tear the wavelength port of the respective links that comprises in the chain signaling open, the information and the corresponding service flow information of timeslot number changes the business time-slot mapping table.
6) Optical Switch Node equipment connects the workflow description that allocation list carries out the optical cross connect configuration according to the inbound port that goes out of each time slot: all optical switching devices in the network are after first time slot begins, and the device hardware control module is finished the connection configuration according to the optical cross connect device that goes out in the inbound port connection allocation list control appliance of current first time slot.And the connection of all OXC of the whole network is configured in the s that each time slot begins and finishes in the time.After time, the UNI of network edge begins to carry out professional optical transparency transmission at first time slot at s that first time slot begins.After first time slot finishes second time slot at first, the UNI of network edge stops the business transmission of first time slot.All devices hardware controls module in the optical-fiber network connects allocation list and controls the optical cross connect device again and finish within Fixed Time Interval s and connect configuration according to the inbound port that goes out of second time slot, restarts the transparent transmission business then in the network, by that analogy.When to N time slot when finishing, then device control module connects allocation list and carries out the port assignment according to the inbound port that goes out from first time slot automatically, finishes the circulation of one-period.From the topology of network, the optical fiber physical topology of network is constant, but the beginning of each time slot, and along with the change of optical fiber cross-connect configuration, the virtual topology of optical-fiber network then changes accordingly.
The following describes in the network and begin the signaling process of request link to the dismounting link from professional requesting node:
1) at first the service request node when perhaps controlling signaling request increase bandwidth, perhaps when traffic growth needs bigger bandwidth, all sends the link setup demand signalling to the UNI that it connected when new business is arranged.
2) at the UNI of network edge node, when UNI receives the link setup request of certain network edge service request node, can employing and ASON and similar method for routing of IETF and link constructing method.At first require to find out a route according to the Internet resources situation and in conjunction with service traffics.Then transmit the link setup signaling, to purpose UNI, set up a link (can be the optical channel of a time slot or a plurality of time slots according to this link of amount of capacity) down between the purpose network edge service node at source UNI along this route.It should be noted that because to adopt with link be unit with the light time crack, make in the one-period that the number that a source UNI can purpose of connecting UNI can be more than the output wavelength of source UNI.
3) after link setup is finished, source UNI carries out buffer memory to the data on flows that service request node (such as router) sends earlier.After time, source UNI begins to transmit service traffics on the wavelength of correspondence at s that the time slot that link setup is applied for begins, and arrives purpose UNI by optical-fiber network, and destination UNI sends to purpose network edge service node to corresponding discharge again.
4) need remove certain link of crack the time when the service request node light time, send to the UNI of correspondence and tear the chain signaling open.UNI again in network the Optical Switch Node of this light time crack link process and destination UNI send and to tear the chain signaling open.The signaling processing module of corresponding light switching node then connects configuration and deletes the corresponding light that inbound port connects allocation list of going out of corresponding time slot, and source end and destination UNI also should delete business time-slot mapping table corresponding entry.
Claims (5)
1, a kind of optical wavelength switching method based on the whole network synchronization slot, comprise that optical-fiber network is made up of Optical Switch Node (OXC), service request node, User Network Interface (UNI), independently control aspect of network utilisation is implemented the dynamic-configuration connection management, Optical Switch Node connects allocation list configuration optical cross connect according to going out inbound port accordingly, the User Network Interface at edge has the corresponding service mapping table, and key-course is according to the switch that carries out optical cross connect in the signaling control appliance of receiving; It is characterized in that: all nodes of the whole network carry out the interconnection assignment of optical channel according to the inbound port connection allocation list that goes out of each corresponding time slot down synchronously a unified time slot, the User Network Interface at edge (UNI) transmits in time slot corresponding a certain business according to the business time-slot mapping table on wavelength, be the professional transfer mechanism of time slot thereby provide with minimum cross-over unit; Detailed process is as follows:
1) at first whole network is unified sets one period regular time and is spaced apart a time slot, and a plurality of time slot is an one-period;
2) switching node of each in the network inbound port that goes out that includes each time slot connects allocation list, total N connects allocation list, and loop cycle, the User Network Interface at edge (UNI) has flow business and the mapping table that is connected of corresponding light network slot, i.e. the business time-slot mapping table of each service request node;
3) switching node in the network connects allocation list and disposes its optical cross connect at the inbound port that goes out of each time slot according to corresponding time slot, fringe node outputs to the corresponding business flow in the corresponding wavelength according to corresponding business time-slot mapping table at this time slot in the network, and in moment buffer memory business datum that these service traffics are not transmitted;
The route of the amended ASON of network using (ASON), link setup and tear chain open, and relevant signaling.
2, the optical wavelength switching method based on the whole network synchronization slot according to claim 1, it is characterized in that: all nodes of described the whole network carry out interconnection assignment and transport service a unified time slot synchronously, the User Network Interface (UNI) of all Optical Switch Nodes of the whole network (OXC) and network edge realizes that in the business that the unified time point carries out the optical switch switching action and changes wavelength transmission synchronous approach has two kinds: the one, and the clock that provides by the clock synchronization network is to the equipment timing; Be that few and each Optical Switch Node internal clocking is directly exported to equipment regularly by each intra-node clock comparatively accurately under the situation at node again.
3, the optical wavelength switching method based on the whole network synchronization slot according to claim 1 is characterized in that: the beginning of each time slot, and along with the change of optical fiber cross-connect configuration, then the virtual topology of optical-fiber network correspondingly changes; After each time slot begins the whole network unification and carries out interconnection and finish, could begin the transport service flow; User Network Interface and Optical Switch Node by the edge carry out statistic multiplexing to each time slot in the whole network one-period according to the size of each service traffics; In the one-period source UNI can purpose of connecting UNI number can be more than the output wave long number of source UNI self.
4, the optical wavelength switching method based on the whole network synchronization slot according to claim 1, it is characterized in that: described route ASON (ASON), link setup and tear chain open, and the modification of relevant signaling is: all need be modified to the wavelength time slot is minimum request unit and cross-over unit.
5, the optical wavelength switching method based on the whole network synchronization slot according to claim 1 is characterized in that: described time slot go out in renewal that inbound port connects allocation list and business time-slot mapping table and the network that link setup is torn the chain signaling open or the webmaster order is relevant.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008092389A1 (en) * | 2007-01-26 | 2008-08-07 | Huawei Technologies Co., Ltd. | Multi-component compatible data architecture |
| CN1764323B (en) * | 2005-11-11 | 2010-04-14 | 中兴通讯股份有限公司 | Method for avoiding congenetic burst service resource collision in automatic switched optical network |
| US7787498B2 (en) | 2007-01-26 | 2010-08-31 | Futurewei Technologies, Inc. | Closed-loop clock synchronization |
| US7809027B2 (en) | 2006-09-25 | 2010-10-05 | Futurewei Technologies, Inc. | Network clock synchronization floating window and window delineation |
| US7813271B2 (en) | 2006-09-25 | 2010-10-12 | Futurewei Technologies, Inc. | Aggregated link traffic protection |
| US7961751B2 (en) | 2006-09-25 | 2011-06-14 | Futurewei Technologies, Inc. | Multiplexed data stream timeslot map |
| US7986700B2 (en) | 2006-09-25 | 2011-07-26 | Futurewei Technologies, Inc. | Multiplexed data stream circuit architecture |
| US8295310B2 (en) | 2006-09-25 | 2012-10-23 | Futurewei Technologies, Inc. | Inter-packet gap network clock synchronization |
| US8340101B2 (en) | 2006-09-25 | 2012-12-25 | Futurewei Technologies, Inc. | Multiplexed data stream payload format |
| CN103107896A (en) * | 2011-11-09 | 2013-05-15 | 李秉钧 | Transmission resource scheduling system covering whole transport network |
| US8494009B2 (en) | 2006-09-25 | 2013-07-23 | Futurewei Technologies, Inc. | Network clock synchronization timestamp |
| US8532094B2 (en) | 2006-09-25 | 2013-09-10 | Futurewei Technologies, Inc. | Multi-network compatible data architecture |
| US8660152B2 (en) | 2006-09-25 | 2014-02-25 | Futurewei Technologies, Inc. | Multi-frame network clock synchronization |
| US8976796B2 (en) | 2006-09-25 | 2015-03-10 | Futurewei Technologies, Inc. | Bandwidth reuse in multiplexed data stream |
| CN107547135A (en) * | 2016-06-28 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of method, apparatus and group network system for realizing BBU and RRU networkings |
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| CN1764323B (en) * | 2005-11-11 | 2010-04-14 | 中兴通讯股份有限公司 | Method for avoiding congenetic burst service resource collision in automatic switched optical network |
| US8401010B2 (en) | 2006-09-25 | 2013-03-19 | Futurewei Technologies, Inc. | Multi-component compatible data architecture |
| US8976796B2 (en) | 2006-09-25 | 2015-03-10 | Futurewei Technologies, Inc. | Bandwidth reuse in multiplexed data stream |
| US9106439B2 (en) | 2006-09-25 | 2015-08-11 | Futurewei Technologies, Inc. | System for TDM data transport over Ethernet interfaces |
| US7809027B2 (en) | 2006-09-25 | 2010-10-05 | Futurewei Technologies, Inc. | Network clock synchronization floating window and window delineation |
| US7813271B2 (en) | 2006-09-25 | 2010-10-12 | Futurewei Technologies, Inc. | Aggregated link traffic protection |
| US7961751B2 (en) | 2006-09-25 | 2011-06-14 | Futurewei Technologies, Inc. | Multiplexed data stream timeslot map |
| US7986700B2 (en) | 2006-09-25 | 2011-07-26 | Futurewei Technologies, Inc. | Multiplexed data stream circuit architecture |
| US8494009B2 (en) | 2006-09-25 | 2013-07-23 | Futurewei Technologies, Inc. | Network clock synchronization timestamp |
| US8289962B2 (en) | 2006-09-25 | 2012-10-16 | Futurewei Technologies, Inc. | Multi-component compatible data architecture |
| US8295310B2 (en) | 2006-09-25 | 2012-10-23 | Futurewei Technologies, Inc. | Inter-packet gap network clock synchronization |
| US8340101B2 (en) | 2006-09-25 | 2012-12-25 | Futurewei Technologies, Inc. | Multiplexed data stream payload format |
| US8982912B2 (en) | 2006-09-25 | 2015-03-17 | Futurewei Technologies, Inc. | Inter-packet gap network clock synchronization |
| US7675945B2 (en) | 2006-09-25 | 2010-03-09 | Futurewei Technologies, Inc. | Multi-component compatible data architecture |
| US9019996B2 (en) | 2006-09-25 | 2015-04-28 | Futurewei Technologies, Inc. | Network clock synchronization floating window and window delineation |
| US8532094B2 (en) | 2006-09-25 | 2013-09-10 | Futurewei Technologies, Inc. | Multi-network compatible data architecture |
| US8588209B2 (en) | 2006-09-25 | 2013-11-19 | Futurewei Technologies, Inc. | Multi-network compatible data architecture |
| US8837492B2 (en) | 2006-09-25 | 2014-09-16 | Futurewei Technologies, Inc. | Multiplexed data stream circuit architecture |
| US8660152B2 (en) | 2006-09-25 | 2014-02-25 | Futurewei Technologies, Inc. | Multi-frame network clock synchronization |
| US8605757B2 (en) | 2007-01-26 | 2013-12-10 | Futurewei Technologies, Inc. | Closed-loop clock synchronization |
| WO2008092389A1 (en) * | 2007-01-26 | 2008-08-07 | Huawei Technologies Co., Ltd. | Multi-component compatible data architecture |
| CN101569147B (en) * | 2007-01-26 | 2012-05-02 | 华为技术有限公司 | Multi-Component Compatible Data Architecture |
| US7787498B2 (en) | 2007-01-26 | 2010-08-31 | Futurewei Technologies, Inc. | Closed-loop clock synchronization |
| CN103107896A (en) * | 2011-11-09 | 2013-05-15 | 李秉钧 | Transmission resource scheduling system covering whole transport network |
| CN107547135A (en) * | 2016-06-28 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of method, apparatus and group network system for realizing BBU and RRU networkings |
| CN107547135B (en) * | 2016-06-28 | 2022-04-19 | 中兴通讯股份有限公司 | Method, device and networking system for realizing BBU (base band Unit) and RRU (remote radio unit) networking |
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