CN101094036A - Natural repair mechanism of channel protection ring - Google Patents
Natural repair mechanism of channel protection ring Download PDFInfo
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- CN101094036A CN101094036A CNA2006100430202A CN200610043020A CN101094036A CN 101094036 A CN101094036 A CN 101094036A CN A2006100430202 A CNA2006100430202 A CN A2006100430202A CN 200610043020 A CN200610043020 A CN 200610043020A CN 101094036 A CN101094036 A CN 101094036A
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Abstract
Characteristics of the invention are: the down-going node adjacent to the malfunction point generates and sends out 'AIS'; all nodes on the ring receive 'AIS'; every node makes its own judgment, if there is a business exit, it will reverse the business, while generating 'FERF', and transmits it to the business entry node of the channel (BENC). When BENC receives the corresponding FERF, it will begin the corresponding channel-reversal, thus completes the channel's recovery from S1 to P1. It can reasonably use the network's bandwidth resource, raise the speed of recovery, increase the recovery rate and adapt to malfunction-ridden situations.
Description
Technical field
The invention belongs to communication technical field; relate to the self-healing mechanism in the loop network in a kind of optical-fiber network; a kind of self-healing mechanism of channel protection ring particularly; be used for when network breaks down protection to Network; be used for all kinds of optical-fiber networks; as SDH (Synchronous Digital Hierarchy) net, WDM (wavelength division multiplexing) net, ASON (ASON) net etc.
Background technology
Optical-fiber network is being widely applied, and characteristics that it is exclusive and strong network management ability more and more are subject to people's attention.The research of self-healing problem of carrying out optical-fiber network is not only most important to optical-fiber network itself, and other are utilized the service network of optical-fiber network as bearer network, also is the problem that must consider.Exist two big branches in the research of optical-fiber network self-healing mechanism: the self-healing of ring network and the self-healing of mesh network exist again with the passage in every kind of self-healing and are to recover object and are the situation of recovering object with the multiplex section, thereby drawn different self-healing mechanisms.
The essence of self-healing network is to give a kind of like this ability to network, and it can find to substitute transmission route, and rebulids communication capacity, in the extremely short time, business is recovered from the fault that lost efficacy automatically, and be need not people's intervention.
We can see, ring network simple in structure compared with point-to-point topological structure, and its traffic restoration capability is strong, and compare its business recovery algorithm with the topological structure of mesh network simple, and recovery time is short, therefore is widely used in optical-fiber network.
The present invention on the basis of the deficiency that exists, has proposed a kind of ring of light self-healing mechanism based on path protection in conjunction with the characteristics of ring of light network in fully analyzing ring of light network self-healing Mechanism Study.
Self-healing Rings is a kind of closed hoop that is made of a plurality of nodes, links to each other by duplex communication equipment between each node, can provide the redundant bandwidth and/or the network equipment, so that recover interrupted business automatically.
From the situation of each Self-healing Rings, loop configuration allows Internet resources to share; Existing and protecting passage/circuit under the normal condition is idle problem, and bandwidth availability ratio is low; Recovery time, recovery rate was not considered to allow recovery rate to be lower than 100% situation by 100% design generally in the ms level; All need between node, to transmit control signal during multiplex section protection, need complicated control operation; All need in the specific implementation present APS (APS) standard to be made an amendment, because present APS system designs for Point-to-Point system; Multiplex section protection all is to move the passage that recovers all faults than the low circuit layer of channel layer by loopback, and when using channel management, their flexibility just is restricted like this; Powerless to multiple faults; In various Self-healing Rings, there is not to consider the situation when monocycle expands to multiring structure, especially in the dual node interconnection looped network, their underactions that just seems.
There is following some weak point in traditional Self-healing Rings:
(1) the line switching modes that belong to more
Traditional Self-healing Rings adopts the line switching mode more, and path protection is switched and adopted channel layer signaling (as passage AIS (forward alarm)) to transmit failure message, and is that channel is recovered on the basis with end-to-end.The recovery time that path protection is switched is few, because passage AIS has switching to connect, does not need to stop in the intermediary node of ring.
(2) Huan protection mostly is 1: 1 protection
(3) be unsuitable for carrying out path protection
Because Self-healing Rings is being moved the passage that recovers all faults than the low circuit layer of channel layer by loopback, when managing with passage, their flexibility just is restricted like this.
(4) Traffic Channel is utilized problem again
Traditional two-way 4F Ring is under normal circumstances professional only to be transmitted along a part of route of encircling, so exist the problem that Traffic Channel is utilized again.But present mechanism is not utilized this characteristic again better.The self-healing method of looped network is simple, but all exists the low shortcoming of bandwidth availability ratio.
(5) protected mode
The general character of Self-healing Rings is, it is used for the mode of guard signal all is to carry out the differences such as position that diverse ways is just switched by the transmission direction that changes signal.
(6) close passage problem
The two-way Self-healing Rings of traditional loopback, when node failure or many line faults take place when, some does not exist the service signal of alternate route can not be in time identified, so that from encircling dismounting, has the danger that close passage takes place, as shown in Figure 1, between Node B, C, when between node F, the E line fault being arranged, between trouble-free Node B, the A, information signal identical between node C, D, the E ceaselessly moves along this passage, the resource of ineffective occupation ring.
(7) be unsuitable for recovering multiple faults
The root problem of traditional ring network is powerless to the multistage fault.
(8) the signal time delay problem after the recovery
Mostly traditional loopback protection operation is to be finished by two nodes of adjacency faulty section; the strategy that has adopted circuit to recover; for each impaired service signal; might can not find best restoration route; as shown in Figure 2, the recovery of A → D service signal is along route A → B → A → F → E → D → C → D pocket circle, therefore the invalid special circuit resource of meeting; and, link big in chain rate counted more for a long time, may add the time-delay of large-signal.
(9) employing of APS
Traditional Self-healing Rings network all need be between node when carrying out network recovery transmission control system signal, as the APS byte, realize recovering, and, all need present APS standard is made an amendment.
When network capacity (bandwidth) timing, the utilance that improves resource is a pair of contradiction with the self-healing performance that guarantees network.In the research of in the past self-healing network, be difficult to the research that combines of the assignment problem of standby resources and self-healing algorithm.Numerous algorithms all suppose to have in the network enough standby resources to can be used for setting up restoration route in the self-healing process.
For unidirectional ring, because all service signals that enter in the ring all will pass to receiving node thereby be equivalent to will be by whole ring transmission through both direction, the traffic carrying capacity of ring equals all summations that enter the traffic carrying capacity of ring.Professional route only is the part of ring in the two-way ring, and service channel can be reused, and allows more service signal to divide from ring and inserts, and has increased the flexibility that traffic carrying capacity is distributed in the ring.Different traffic carrying capacity allocative decisions, different routing algorithms, different volume of business in corresponding the ring.
Summary of the invention
Purpose of the present invention just provides a kind of self-healing mechanism of channel protection ring; it is the self-healing mechanism of a kind of two-way four fine intelligent channel protection type Self-healing Rings, it can reasonably utilize network bandwidth resources, improve resume speed, increase recovery rate, adapt to the situation of multiple faults.
The object of the present invention is achieved like this, and a kind of self-healing mechanism of channel protection ring is characterized in that: the descendant node adjacent with fault produces and sends " AIS ", and each node is received " AIS " on the ring; Each node is judged, if professional outlet is arranged, then this business is switched, produce simultaneously " FERF ", ingress for service node to this passage transmits, receive corresponding FERF when this channel service porch node, just carry out corresponding channel switching, so far finish recovery to this passage from S1 to P1.
Described node is meant dropinsert MUX.
Described S1 is the business of up service aisle direction.
Described generation " AIS " is meant and provides the forward alarm report information.
Described business is switched and is meant by channel switching.
Described generation " FERF " is meant and produces the forward error report information.
Algorithm of the present invention has following characteristics:
(1) alarm: adopt channel alarm.
(2) Huan capacity: similar to BSHR/4.
(3) possible to the recovery of multiple faults: not distinguishing here is any fault, only recovers to get final product at each passage, does not need passage K1/K2 byte to distinguish failure mode etc., and not distinguishing is fine fault, disconnected cable, or node failure.
(4) professional uniformity: before each passage uses, on Route Selection, adopted professional equalization algorithm, thereby made the traffic carrying capacity of each section reach optimum balance.
(5) recovery time: saved the time of transmitting K1/K2 back and forth, shorten recovery time greatly.
(6) restoration route: solved the problem of protection route, do not caused transmission range oversize at ring interior circuit.
(7) problem of unrolling: the closed hoop phenomenon when having solved multiple faults.
(8) adapt to development: adopt routing restoration, can be connected well with recovery technology such as ATM.
(9) criterion is single, does not need the APS agreement, realize that easily versatility is good, and BSHR/4 must use the APS agreement, and control is complicated.
(10) recovery under the interconnection situation that easily realizes encircling.
What (11) solved the protection channel resource utilizes problem again.
(12) Multiplex Section Shared Protection Ring is because the restriction of K1/K2 byte figure place, and the node number can not surpass 16, and this algorithm in theory the node number do not limit.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing.
A kind of procedure declaration of resuming work of job failure appears in Fig. 1 between prior art two nodes;
The job failure another kind procedure declaration of resuming work appears in Fig. 2 between the prior art node;
A kind of procedure declaration of resuming work of job failure appears in Fig. 3 between the present invention's two nodes;
The job failure another kind procedure declaration of resuming work appears in Fig. 4 between the present invention's two nodes.
Embodiment
For the step to self-healing mechanism specifies, need be to following every the definition:
BSHR/4IP has four fibres, and transmitted in both directions comprises service aisle (S1/S2) and protection passage (P1/P2) in the ring, and S1 and P1 are a pair of corresponding fine, and S2 and P2 are a pair of corresponding fine.
Service aisle S is meant the passage that under normal circumstances is used for business transferring.Here be two-way ring, promptly up service aisle S1 and downlink working passage S2 can simplify maintenance like this through identical ADM (dropinsert MUX), and obtain shortest path by.
Protection passage P is meant that the passage that is used to resume work sets up after breaking down.Here protecting passage also is to set up well in advance, and it is on that semi-ring relative with service aisle.Certain Route Selection principle is all followed in the foundation of the service aisle of each connection and protection passage, makes each internodal traffic carrying capacity keep even basically.
As shown in Figure 3, in Fig. 3, establish four kinds of business: 1-2-3,2-3-4,5-4-3, and 1-5-4-3 are arranged in the ring.
When node 2,3 interruption cable faults took place, affected business was: professional A:1-2-3 and professional B:2-3-4.
To professional B, its up route is 4-3-2, transmits along S1.Between node 2-3, break down, as follows to the recovering step of professional A: the right side clockwise direction of ring, be defined as up route, the right side of ring counterclockwise is defined as descending route,
(1) node 2 detects fault;
(2) node 2 produces " AIS ";
(3) node 2 sends " " AIS to node 1,5,4;
(4) node 2 is switched to P1 with professional A from S1;
(5) node 2 produces " FERF1 ";
(6) node 2 sends " FERF1 " to node 1,5,4;
(7) node 4 is switched to P1 with professional A from S1 after receiving " FERF1 ".
To professional A, its up route is 3-2-1, transmits along S1.Between node 2-3, break down, as follows to the recovering step of professional B:
(1) node 2 detects fault;
(2) node 2 produces " AIS ";
(3) node 2 sends " " AIS to node 1,5,4;
(4) after node 1 is received " AIS ", professional B is switched to P1 from S1;
(5) node 1 produces " FERF2 ";
(6) node 1 sends " FERF2 " to node 5,4,3;
(7) after node 3 receives " FERF2 ", professional B is switched to P1 from S1.
Like this, former professional 1-2-3 and 2-3-4 under normal circumstances are that S2 transmits in the same side along S1, in when, node 2,3 taking place being interrupted the cable faults when, professional 1-2-3 change the road be 1-5-4-3 along P1, P2 transmits at the opposite side of ring, in like manner, the route of professional 2-3-4 changes 2-1-5-4 into.
Some explanation:
(1) employing of path protection
Here why adopt the reason of path protection to be, what adopt in the path protection scheme is that the signal (as passage " AIS ") of channel layer comes trigger protection to switch, and different with the route protection scheme, the path protection scheme of switching can be recovered an end-to-end channel.The channel switching of certain dedicated channel is the state that is independent of other passages, even a node detection is still switched at channel level for the path protection Self-healing Rings to being line fault.
Path protection can be simplified the execution controlling mechanism of recovering, and need not hold consultation between node and just faulty channel can be recovered, and reduces recovery time; In addition, recover, can be connected well with the control that future, ATM netted, and can also adapt to the situation of multiple faults at channel layer.
(2) routing mechanism
In this self-healing algorithm, introduced routing algorithm,, improved the utilance of network greatly, reduced capacity requirement loop to seek rational traffic carrying capacity allocative decision.
For two-way ring, routing algorithm commonly used has: minimum switching method, professional load balance algorithm, non-segmentation services algorithm, segmentation services loading algorithm etc.
In order to keep professional integrality, this adopts non-segmentation services algorithm.
In the non-segmentation services algorithm same node between business on identical loop direction, transmit, different nodes between professional route allow by different loop directions, service route in reasonably arranging to encircle by certain algorithm between the node makes that the traffic carrying capacity maximum on the link is as far as possible little.
(3) situation of multiple faults
In this algorithm, no matter be node failure or segment fault or fine fault, Restoration Mechanism is identical, with the passage is to recover object, and only recovers to be subjected to the passage of fault effects.Whole recovery only need pass once " AIS " and " FERF " signal and do to switch for twice and get final product.In addition, the Restoration Mechanism of this algorithm when multiple faults takes place also is identical.
When multiple faults took place, passage recovered because the Restoration Mechanism of ring itself is based on, and still can seek the replacement passage in ring.If certain passage can not find restoration route in ring, also this signal can be reached in another net through crossover node, come circuitous by another net.
As shown in Figure 4, in Fig. 4, be provided with 5 kinds of business: 5-1-2; 4-5-1; 3-4-5; 2-3-4; 1-2-3.
When the disconnected cable of 2,3 of node 3,4 and nodes takes place when, professional 1-2-3 and 3-4-5 can not recover, at this moment, suppose that this ring is by node 2 and node 3 etc. and other rings or net interconnecting, at this moment adopt the notion of routing restoration, just can reach other nets, to seek alternate route with alarm along the shared node of passage through between ring (net).
In a word, the descendant node adjacent with fault produces and sends " AIS ", and each node is received " AIS " on the ring; Each node is judged, if professional outlet is arranged, then this business is switched (pressing channel switching), produce simultaneously " FERF ", ingress for service node to this passage transmits, receive corresponding FERF when this channel service porch node, just carry out corresponding channel switching, so far finish recovery (from S1 to P1) this passage.
Claims (6)
1, a kind of self-healing mechanism of channel protection ring is characterized in that: the descendant node adjacent with fault produces and sends " AIS ", and each node is received " AIS " on the ring; Each node is judged, if professional outlet is arranged, then this business is switched, produce simultaneously " FERF ", ingress for service node to this passage transmits, receive corresponding FERF when this channel service porch node, just carry out corresponding channel switching, so far finish recovery to this passage from S1 to P1.
2, the self-healing mechanism of a kind of channel protection ring according to claim 1 is characterized in that: described node is meant dropinsert MUX.
3, the self-healing mechanism of a kind of channel protection ring according to claim 1 is characterized in that: described S1 is the business of up service aisle direction.
4, the self-healing mechanism of a kind of channel protection ring according to claim 1 is characterized in that: described generation " AIS " is meant and provides the forward alarm report information.
5, the self-healing mechanism of a kind of channel protection ring according to claim 1 is characterized in that: described business is switched and is meant by channel switching.
6, the self-healing mechanism of a kind of channel protection ring according to claim 1 is characterized in that: described generation " FERF " is meant and produces the forward error report information.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100430202A CN101094036A (en) | 2006-06-23 | 2006-06-23 | Natural repair mechanism of channel protection ring |
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| CNA2006100430202A CN101094036A (en) | 2006-06-23 | 2006-06-23 | Natural repair mechanism of channel protection ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009082970A1 (en) * | 2007-12-27 | 2009-07-09 | Huawei Technologies Co., Ltd. | Sharing protection ring of data cell of optical channel, signal transmission method and network node |
| WO2010028560A1 (en) * | 2008-09-10 | 2010-03-18 | 中兴通讯股份有限公司 | Method for realizing permanent ring network protection in mesh network |
| CN101471837B (en) * | 2007-12-27 | 2011-07-06 | 华为技术有限公司 | Optical channel data cell sharing protection ring, signal transmission method and network node |
-
2006
- 2006-06-23 CN CNA2006100430202A patent/CN101094036A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009082970A1 (en) * | 2007-12-27 | 2009-07-09 | Huawei Technologies Co., Ltd. | Sharing protection ring of data cell of optical channel, signal transmission method and network node |
| CN101471837B (en) * | 2007-12-27 | 2011-07-06 | 华为技术有限公司 | Optical channel data cell sharing protection ring, signal transmission method and network node |
| WO2010028560A1 (en) * | 2008-09-10 | 2010-03-18 | 中兴通讯股份有限公司 | Method for realizing permanent ring network protection in mesh network |
| CN101674217B (en) * | 2008-09-10 | 2012-09-05 | 中兴通讯股份有限公司 | Method for realizing permanent ring network protection in MESH network |
| US8593941B2 (en) | 2008-09-10 | 2013-11-26 | Zte Corporation | Method for implementing permanent ring network protection in an MESH network |
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Open date: 20071226 |