CN109450526A - A kind of fault protecting method based on distant-end node pretection switch - Google Patents
A kind of fault protecting method based on distant-end node pretection switch Download PDFInfo
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- CN109450526A CN109450526A CN201811538903.XA CN201811538903A CN109450526A CN 109450526 A CN109450526 A CN 109450526A CN 201811538903 A CN201811538903 A CN 201811538903A CN 109450526 A CN109450526 A CN 109450526A
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- segmentation
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- end node
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- pretection switch
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/038—Arrangements for fault recovery using bypasses
Abstract
A kind of fault protecting method based on distant-end node pretection switch is claimed in the present invention, the fault protecting method being related in light wireless fusion access net.After the present invention is directed to network failure, spare fibre is disposed in the big problem of interrupting service recovery latency, proposition between the distant-end node of different segmentations, while proposing a kind of distant-end node structure with pretection switch function, to realize the pretection switch of interrupting service.After some segmentation is broken down in network, by the pretection switch function of RN, the interrupting service of failure segmentation will be quickly transferred in normal segmentation.The present invention can greatly reduce the recovery latency of business to avoid network congestion during business recovery.
Description
Technical field
The invention belongs in fiber radio integration access Network Communication technical field more particularly to fiber radio integration access net
Fault protecting method.
Background technique
With becoming increasingly popular for intelligent terminal, various mobile services and multimedia service show the state of explosive increase
Gesture, user are also more more and more intense to the access demand of high bandwidth, high quality, high flexibility.Therefore, as network, " last is public
In " broadband access network be faced with stern challenge, under low cost, large capacity, high flexibility and strong survivability have become
The new demand of generation broadband access technology and fresh target.Therefore, academia proposes a kind of new fiber radio integration in recent years
Access network technology (Fiber-Wireless Access Network, FiWi Access Network), referred to as FiWi access
Net.Due to FiWi access net have effectively achieved optical access network large capacity, over long distances with the low cost of wireless access network, Gao Ling
The complementation of the advantages such as activity, FiWi access net are considered as one of the primary solutions of next-generation broadband access network.
FiWi access net generally comprises multiple segmentations, each segmentation is located at the wireless mesh network of front end by one
(Wireless Mesh Networks, a WMN) and passive optical network (Passive Optical positioned at rear end
Network, PON) it forms, the optical line terminals (Optical Line Terminal, OLT) of difference segmentation are placed in operator
Central office (Central Office, CO).Optical network unit (Optical Network Unit, ONU) and OLT pass through wiring
Optical fiber (Distribution Fiber, DF), distant-end node (Remote Node, RN) and trunk fiber (Feeder Fiber,
FF) it is connected.Network is accessed compared to other, the area coverage of FiWi access net is wider, and the number of users of service is more, once occur
Failure will cause greater area of network paralysis.Therefore the failure protection techniques research in FiWi access net has important reason
Refer to realistic meaning.
Currently, the fault protecting method in FiWi access net is broadly divided into two major classes.One kind is switched based on wireless path
Guard method, due to FiWi access net front end wireless mesh network (Wireless Mesh Networks, WMN) can be business
One or more of spare wireless paths are provided, therefore, as network element such as DF, ONU, Radio Link (Wireless in segmentation
Link, WL), wireless router (Wireless Router, WR) etc. is when breaking down, can be found in WMN for interrupting service
Available spare wireless path is switched, and the failure network element in WMN is avoided, to ensure that the normal transmission of business.Ren
D, Li H, Ji Y. etc. is in " Demonstration of QoS-aware wireless protection scheme for
video service in fiber-wireless access network”【Optik-International Journal
For Light and Electron Optics, 2013,124 (14): 1827-1831.] in propose a kind of service quality
The video traffic wireless protection mechanism of (Quality of Service, QoS) perception, it is spare wireless by being disposed between WONU
Resource, and ensured using linear prediction algorithm and media transmission quality evaluation index (Media Delivery Index, MDI)
The transmission quality of video traffic.Liu Y J, Guo L, Yu Y P etc. is in " Connection availability based
protection algorithm in wireless-optical broadband access network”【Science
China Information Sciences, 2014,57 (4): 1-9.] in propose it is a kind of based on the wireless of connection availability model
Heavy-route protection scheme distributes spare WONU first to be unsatisfactory for the WONU of availability requirement, then spare for each pair of work-
WONU calculates spare wireless path and configures spare wireless radio interface and reserve spare radio frequency capacity.Although such method can be with
Restore the business for being influenced to interrupt by failure on the basis of no extra cost, but needs longer recovery latency available to find
Wireless path, in addition such method can only solve the case where being segmented interior network element failure, when OLT, FF etc. break down, in segmentation
All network elements will all be disconnected with OLT, data can not be retransmited.
Second class method is that spare fibre, failure are disposed between multiple segmentations based on the guard method of spare fibre deployment
Interrupting service in segmentation is transferred in the segmentation of normal work by spare fibre.Such method can solve OLT, FF etc.
Segmentation stage failure.Guo L, Liu Y, Wang F etc. is in " Cluster-based protection for survivable
fiber-wireless access networks”【Journal of Optical Communications and
Networking, 2013,5 (11): 1178-1194.] in propose a kind of fault protecting method based on sub-clustering.For multiple points
The case where section simultaneous faults, to minimize spare fibre lower deployment cost as target, use integral linear programming (Integer
Linear Programming, ILP) method solve spare ONU selection, each segmentation sub-clustering and spare fibre deployment joint it is excellent
Change problem.Liu Y, Song Q, Ma R et al. is in " Protection based on backup radios and backup
fibers for survivable fiber-wireless(FiWi)access network”【Journal of Network
And Computer Applications, 2013,36 (3): 1057-1069.] in propose a kind of guarantor based on backup optical loop
Protection mechanism.The mechanism will be respectively segmented in FiWi access net using genetic algorithm and be divided into multiple clusters, and using backtracking method each
Most short Hamilton loop is found in cluster, and spare fibre deployment is carried out according to most short Hamilton loop.Although such method can be with
Fast quick-recovery interrupting service, but need to dispose a large amount of spare fibre, protect higher cost.
Guard method based on spare fibre deployment usually disposes spare fibre between the ONU of each segmentation, logical with this segmentation
Cross the spare segmentation that the segmentation that spare fibre is connected is known as this segmentation.Although this method can quickly restore data,
All business of failure segmentation are all needed through spare ONU, and then are transferred in its spare segmentation.And remaining in failure segmentation
Although ONU does not break down, since it does not arrive the active path of spare segmentation, thus these ONU cannot be forwarded
Data, then all business in failure segmentation will all gather in the spare WONU, this will lead to serious network congestion, in turn
Lead to increased dramatically for recovery latency.Therefore how to reduce business recovery time delay is in design FiWi access net based on spare fibre
The key of the fault protecting method of deployment.
Summary of the invention
Problem to be solved by this invention is: for the fault protecting method disposed based on spare fibre, disposing between ONU
When spare fibre, the problem of being easy to cause network congestion, and then recovery latency is caused to increased dramatically, the present invention proposes a kind of new
RN structure, and spare fibre is disposed between distant-end node, the largely lower recovery latency of interrupting service.
The technical solution adopted by the present invention to solve the technical problems is: in the distant-end node (Remote of different segmentations
Node, RN) between dispose spare fibre, and propose a kind of RN structure with pretection switch function to support the portion of spare fibre
Administration.Mentioned RN structure includes optical splitter, decision circuit, photoswitch.When FF or OLT break down, decision circuit will be according to event
Hinder situation and switching operation is carried out to photoswitch, to restore the business for being influenced to interrupt by failure.
Further, when fault-free in network, the RN being respectively segmented is in normal mode of operation；When FF in network or OLT is sent out
When raw failure, the RN node of failure segmentation is in by protected mode, is segmented the normal segmentation connecting by spare fibre with failure
RN be in protected mode, the RN being segmented from failure is transferred to the RN being normally segmented by interrupting service, and then is transferred to normal point
The OLT of section is simultaneously transmitted in internet.
Further, normal segmentation will according to dynamic bandwidth allocation algorithm (Dynamic Bandwidth Allocation,
It DBA is) the ONU bandwidth allocation of failure segmentation.In DBA, each polling cycle is divided into 2 subcycles: well-behaved cross-talk week
Phase and failure are segmented subcycle.The well-behaved cross-talk period is used to send and receive data to the ONU in this section；Failure is segmented subcycle
Data are sent and received for the ONU in being segmented to failure.
The beneficial effects of the present invention are: fault protecting method proposed by the present invention disposes spare fibre between different RN,
After network failure, interrupting service can be directly transferred in the OLT being normally segmented by RN and by optical fiber.Compared to
The method that spare fibre is disposed between ONU, this method avoids failure business to gather in some ONU, to cause serious net
Network congestion significantly reduces the recovery latency of failure business.
Detailed description of the invention:
Fault protecting method flow chart of the Fig. 1 based on distant-end node pretection switch；
Spare fibre dispositions method in Fig. 2 FiWi access net；
A kind of new RN structure with pretection switch of Fig. 3；
Fig. 4 subcycle schematic diagram；
Specific embodiment
Implementation of the invention is described specifically below in conjunction with drawings and concrete examples.
This method proposition disposes spare fibre between the RN of multiple segmentations, to avoid network congestion, to reduce failure industry
The recovery latency of business, as shown in Figure 1.When FF or OLT break down, all business of failure segmentation will be interrupted.Therefore
Interrupting service in barrier segmentation will be transferred in the RN being normally segmented by the spare fibre being deployed between RN, and then is forwarded to
In the OLT being normally segmented, as shown in Figure 2.
Meanwhile this method proposes a kind of new RN structure, to complete the pretection switch function after failure, the RN mentioned has three
Kind of operating mode: normal mode, protected mode and by protected mode, as shown in Figure 3.The three of RN are illustrated with reference to the accompanying drawing
Kind operating mode.
1. normal mode
When fault-free, the RN being respectively segmented is in normal mode of operation, and photoswitch is placed between a-b.In this segmentation
All business will all pass through the normal route transmission services in Fig. 3.The downlink data of each segmentation OLT is through photoswitch a-b and light splitting
It is broadcast in the ONU in this segmentation after device 1.And be respectively segmented ONU sending upstream data after optical splitter 1 and photoswitch a-b,
It is transferred in the OLT of this segmentation, and then is transferred to internet.
2. protected mode
When OLT or FF failure occurs by other segmentations that spare fibre is connected with this segmentation, the RN of this segmentation is in
Protected mode, and the RN of failure segmentation is in by protected mode.At this point, this segmentation needs the interrupting service being segmented for failure to provide
Protection.All business of this segmentation will all be transmitted by the normal route in Fig. 3, and all business of failure segmentation pass through in Fig. 3
Protection path 1 be transferred to the RN of this segmentation, and be forwarded in the OLT of this segmentation.
Decision circuit will send control signals to photoswitch according to authorization time slot of the DBA to each segmentation ONU, trigger photoswitch
It is switched.In DBA, the polling cycle of this segmentation is divided into 2 subcycles: subcycle 1 and subcycle 2.Subcycle 1 is used for
Data are sent and received to the ONU of this segmentation, the ONU that subcycle 2 is used to be segmented to failure sends and receives data, such as Fig. 4 institute
Show, wherein ONU1,2 and 3 be this segmentation ONU, ONU4,5 and 6 be failure segmentation ONU.When RN is in subcycle 1, i.e., originally
When the ONU of segmentation sends data, photoswitch is placed between a-b；When RN is in subcycle 2, i.e. the ONU of failure segmentation sends number
According to when, photoswitch is placed between a-c.
3. by protected mode
When OLT or FF failure occurs for this segmentation, the RN of this segmentation is in by protected mode, and passes through spare fibre with it
The connected RN being normally segmented is in protected mode.At this point, the photoswitch of this segmentation is placed between b-c, all industry of this segmentation
Business needs to be transferred to by Protection path 2 in other segmentations.Each ONU of this segmentation by according to payload size at different spare point
It is registered in section, the operation such as ranging, so that the OLT of spare segmentation is that WONU calculates authorization time slot.All business all will be into
After crossing optical splitter 1 and optical splitter 2, it is transferred to other segmentations.
Claims (5)
1. a kind of fault protecting method based on distant-end node pretection switch, it is characterised in that: in the distant-end node of different segmentations
Between dispose spare fibre, while proposing a kind of distant-end node structure with pretection switch function, including 2 optical splitters, 1 light
Switch, 1 decision circuit.The RN is there are three types of operating mode: normal mode, protected mode and by protected mode.
2. a kind of fault protecting method based on distant-end node pretection switch according to claim 1, it is characterised in that: when
When network does not have failure, distant-end node is under normal mode, and photoswitch is placed between a-b.
3. a kind of fault protecting method based on distant-end node pretection switch according to claim 1, it is characterised in that: when
When being broken down with this segmentation by other segmentations that spare fibre is connected, the distant-end node of this segmentation is in protected mode, and
The distant-end node of failure segmentation is in by protected mode.When the ONU of this segmentation sends data, photoswitch is placed between a-b；When
When the ONU of failure segmentation sends data, photoswitch is placed between a-c.
4. a kind of fault protecting method based on distant-end node pretection switch according to claim 1, it is characterised in that: when
When the distant-end node of this segmentation is in protected mode, in dynamic bandwidth allocation algorithm, the polling cycle of this segmentation is divided into 2
Subcycle: subcycle 1 and subcycle 2.Subcycle 1 is used to send and receive data to the ONU of this segmentation, and subcycle 2 is for giving
The ONU of failure segmentation sends and receives data.
5. a kind of fault protecting method based on distant-end node pretection switch according to claim 1, it is characterised in that: when
When this segmentation is broken down, the distant-end node of this segmentation is in by protected mode, and it is normal to be connected with it by spare fibre
The RN of segmentation is in protected mode.At this point, the photoswitch of this segmentation is placed between b-c.
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