CN102098594A - Signaling conflict avoiding method based on connecting establishment of information diffusion optical-fiber network - Google Patents
Signaling conflict avoiding method based on connecting establishment of information diffusion optical-fiber network Download PDFInfo
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- CN102098594A CN102098594A CN2011100469699A CN201110046969A CN102098594A CN 102098594 A CN102098594 A CN 102098594A CN 2011100469699 A CN2011100469699 A CN 2011100469699A CN 201110046969 A CN201110046969 A CN 201110046969A CN 102098594 A CN102098594 A CN 102098594A
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Abstract
The invention relates to a signaling conflict avoiding method based on connecting establishment of an information diffusion optical-fiber network, which can be used for effectively avoiding signaling conflicts in the process of connecting establishment and lowering the signaling blocking rate. The signaling conflict avoiding method is realized on a control plane server of the information diffusion optical-fiber network on the basis of a traditional RSVP-TE (Resource Reservation Protocol-Traffic Extension). When resource reservation adopting the traditional RSVP fails at a certain node, the signaling conflict avoiding method comprises the following steps of: firstly, searching an optimal route for reaching to a target node from other ports in a route database of the node and replacing the rest part of the original route with the optimal route to finish the redirection of the route; if the redirection of the route fails, redirecting the route at one or more previously passed nodes by adopting a returning mechanism in the method; and finally, after a resource reservation signaling stream reaches to the target node, enabling a reservation confirmation signaling stream to return to a resource node along the inverse direction of the final route, carrying out photoswitch switching at each passed node, and meanwhile, flooding the corresponding link state changing information towards the whole network.
Description
Technical field
The invention belongs to technical field of optical network communication, especially refer to a kind ofly setting up Signalling method based on the connection in the diffusion of information optical-fiber network, can effectively avoid connecting the signaling conflict in the process of foundation, thereby reduce the signaling blocking rate of network, improve overall performance of network.
Background technology
For distributed optical network, the information from flooding that connects after foundation and Link State change all needs certain hour, and this needs the whole network information convergence process after causing network state to change.Therefore, if professional arrival rate is higher network convergence as yet when causing calculating certain professional route, its result of calculation not necessarily meets the real resource state of network, thereby cause this business to be set up in connection the signaling conflict takes place in the process.For existing optical-fiber network based on link-state routing protocol, because calculating, route finishes at source node, can't it be made amendment in the process and set up, thereby be difficult to fundamentally avoid the generation of signaling conflict in connection.Therefore, for this class network, even if when offered load intensity is very low, because the existence of signaling conflict, network blocking probability still can't be significantly reduced, and this has restricted the raising of overall performance of network.
Yet, (see: Hua Nan, Han Liuyan, Zheng Xiaoping, Zhang Hanyi, ZhouBing Kun for optical-fiber network (back claims the diffusion of information optical-fiber network) based on the diffusion of information route, " based on the optical network routing method of diffusion of information ", patent of invention: 201010122652.4, (in March, 2010)), route calculating is distributed in each network node and carries out.Owing to all preserve many routes that arrive every other node by its each port in the diffusion of information database of each network node, therefore in theory can be when connection sets up that the signaling conflict takes place in the process, replace the obstruction route by carrying out redirection of router, thereby effectively avoid the generation of signaling conflict.
Research for the diffusion of information optical-fiber network starts from 2010, still is in the starting stage at present at home and abroad, and the new network signaling procedure that carries out at its characteristics research is blank substantially especially.The present invention is conceived to fill up this blank, thus the overall architecture of perfect information diffused light network and further represent its advantage, for its Future Development and following commercialization lay the foundation.
Summary of the invention
Set up signaling blocking rate in the process in order to reduce optical-fiber network in connection, improve overall performance of network, the signaling method for collision avoidance is set up in the connection that the present invention proposes a kind of diffusion of information optical-fiber network, this method is set up in the process in connection than the traditional signaling message method and is had a clear superiority in, and implementation prospect is widely arranged.
According to an aspect of the present invention, provide a kind of connection to set up the signaling method for collision avoidance, it is characterized in that comprising based on the diffusion of information optical-fiber network:
On control plane server based on the diffusion of information optical-fiber network, when one first service request arrives, the source node of described first business is searched the route and the wavelength of expense minimum for described first business in its routing database, and this route and wavelength information is committed to the connection management module of source node;
After the connection management module of described source node is received described route and wavelength information, send the RESV comprise described route and wavelength information to route approach node successively from this source node along described route direction, receive RESV or the resource reservation failure takes place up to the destination node of described first business;
After each described route approach node receives described RESV, this route approach node is reserved its route next jump outbound port link circuit resource according to described route and wavelength information, and institute's reserved resource must not be taken by other business between advance dating.
According to a further aspect of the present invention, said method is characterised in that further and comprises:
After described destination node received RESV, the opposite direction from described destination node along described route direction sent reservation confirmation message to route approach node successively, till described service source node receives reservation confirmation message.
According to a further aspect of the present invention, said method is characterised in that further and comprises:
After each described route approach node receives described reservation confirmation message, by connecting control interface the optical switch that transmits the plane is configured operation, be communicated with the wavelength link of being reserved;
After described service source node received reservation confirmation message and finishes the optical switch configuration operation, whole connection building process was finished, and can carry out transfer of data by the interface channel of this foundation.
According to a further aspect of the present invention, said method is characterised in that and further comprises when some described route approach nodes and carrying out after described route next jump outbound port and wavelength link circuit resource reserve failure,
In the routing database of described route approach node on the inquiry same wavelength plane through the unoccupied route of all unappropriated outbound ports expense minimum in the route of described destination node, and this outbound port and corresponding wavelength link circuit resource thereof reserved;
Replace the routing section from described route approach node to described destination node in the described route with described unoccupied route simultaneously, generate the new resources reserving message, and described new resources reserving message is sent to successively each approach node of described unoccupied route along the direction of described unoccupied route.
According to a further aspect of the present invention, said method is characterised in that further and comprises:
If described route approach node has the wavelength conversion ability, when other outbound ports on its same wavelength plane are all occupied, can be in other enterprising walkings along the street in convertible wavelength plane by being redirected.
According to a further aspect of the present invention, said method is characterised in that described redirection of router comprises:
In the routing database of described route approach node, arrive the route of the expense minimum of described destination node through all unappropriated outbound ports on all convertible wavelength planes of inquiry, and carry out the operation of resource reservation and change/described RESV of transmission.
According to a further aspect of the present invention, said method is characterised in that further and comprises:
If carry out all outbound ports of node of resource reservation failure when all occupied, can start the mechanism of returning, carry out described redirection of router at one or more specified nodes of RESV process before this, comprising:
Carry out opposite direction to it on the hop node transmission heavy-route message of the node of resource reservation failure along described route direction;
After some nodes receive described heavy-route message, carry out described redirection of router on same wavelength plane; If this node has the wavelength conversion ability, when carry out to continue on other convertible wavelength planes, to carry out described redirection of router after the described redirection of router failure on same wavelength plane;
If in the redirection of router failure of this node, this node continues to send heavy-route message along opposite direction hop node on it of described route direction, and repeats described redirection of router operation;
If when described service source node carries out described redirection of router, still fail the connection building process failure terminating.
According to a further aspect of the present invention, said method is characterised in that further and comprises:
Can set the upper limit that the number of times of redirection of router described in the process is set up in connection; The minimum value of this upper limit is 0, and value is that 0 interval scale does not allow to carry out redirection of router;
When after the number of times of described redirection of router reaches the capping value, still failing, then connection building process failure; This moment is from take place to connect setting up the node of failure, send to connect to route approach node successively along the opposite direction of described route direction and set up failed message, up to described service source node receive connect set up failed message till;
Receive after described connection sets up failed message at each described route approach node, discharge its reserved resource.
Description of drawings
Fig. 1 sets up the embodiment schematic flow sheet of Signalling method in single wavelength five nodal information diffused light networks for connection proposed by the invention.
Fig. 2 sets up the embodiment signaling process figure of Signalling method in the linear dual wavelength network of Wavelength variable four nodes for connection proposed by the invention.
Fig. 3 is the change curve of network blocking probability with business load.
Fig. 4 is the change curve of network blocking probability with professional arrival rate.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Fig. 1 sets up the embodiment schematic flow sheet of Signalling method in single wavelength five nodal information diffused light networks for connection according to an embodiment of the invention, and as shown in the figure, the flow process of present embodiment may further comprise the steps:
Shown in Fig. 1 (a), at a time professional 1 (C1) is issued to set up being connected of node 4 at node 1 and node 3 respectively simultaneously with professional 2 (C2) and asks.Search route for these two business in the routing database separately at it respectively with posterior nodal point 1 and node 3, the minimal-overhead route that finds is respectively 1-2-3-4 (C1) and 3-4 (C2).Afterwards, these two routing iinformations are committed to the connection management module of node 1 and node 3 respectively, connect foundation.
Set up in the process in connection, at first node 1 and node 3 send RESV " RESV_C1 " along the route direction of C1 and C2 to each route approach node respectively and reach " RESV_C2 " also reserved resource on the way.Shown in Fig. 1 (b), when also preparing to reserve the resource of link 3-4, because this link circuit resource is reserved by professional C2, the signaling conflict takes place, so the startup redirection of router when the RESV " RESV_C1 " of professional C1 arrives node 3.Yet, because node 3 only has an outbound port to cover the routing iinformation of node 4 and has been reserved, be single wavelength network simultaneously, therefore start the mechanism of returning, attempt carrying out redirection of router at the node of RESV " RESV_C1 " process before this.
Shown in Fig. 1 (c), node 3 sends heavy-route message (ReRT_C1) to node 2, attempts carrying out redirection of router at node 2.Node 2 inquires its another route 2-5-4 to node 4 in its routing database unoccupied, so replace the remainder of original route with it, generate new route 1-2-5-4 and new resources reserving message " RESV ", and send this new resources reserving message " RESV " by normal flow, continue the road construction process (Fig. 1 (d)) of C1.So far, the signaling conflict that takes place at node 3 places is successfully solved.
Shown in Fig. 1 (c) and Fig. 1 (e), after node 3 and node 1 were received reservation confirmation message " CONF_C2 " and " CONF_C1 " respectively, the process of setting up that is connected of C2 and C1 finished, and two professional connections all successfully set up.
Fig. 2 sets up the embodiment signaling process figure of Signalling method in the linear dual wavelength network of Wavelength variable four nodes for connection proposed by the invention, and as shown in the figure, the signaling process of present embodiment may further comprise the steps:
In the present embodiment, node S trial is that a service request to node D connects.Wherein, node A is wavelength conversion node (WIXC), possesses the long ability to transform of all-wave.
At first, node S searches route for this business in its routing database, and the minimal-overhead route that finds is S-A-B-D, and shared wavelength is λ
0Afterwards, this routing iinformation is submitted to the connection management module of node S, connects foundation.
Set up in the process in connection, at first node S reserves S-A (λ
0) port and link circuit resource, and send RESV " RESV " to node A.This message is through transmission delay T
tThe back arrives node A.When node A receives RESV " RESV ", and prepare to reserve A-B (λ
0) port and during link circuit resource, find that this resource is taken by other business, the signaling conflict takes place, so start redirection of router.
Redirection of router is at first at wavelength plane λ
0Attempt.Because at wavelength plane λ
0, node A only has an outbound port to cover the routing iinformation of node D and has been reserved, carries out the redirection of router failure on this wavelength plane.
Because node A possesses the long ability to transform of all-wave, next at wavelength plane λ
1Attempt redirection of router.On this wavelength plane, node A inquires route A-B-D in its routing database unoccupied, so with its remainder of replacing original route, generate new route S (λ
0)-A (λ
1)-B (λ
1)-D and new resources reserving message " RESV ", and send this new resources reserving message " RESV " by normal flow and continue the road construction process, the signaling conflict is successfully solved.In this process, signaling process and redirection of router process be T consuming time respectively
pAnd T
r
After node D received RESV " RESV ", the direction from this node along D-B-A-S sent reservation confirmation message " CONF " to the approach node successively.After each approach node receives reservation confirmation message " CONF " message, connect control interface by CCI the optical switch that it transmits the plane is configured operation, be communicated with the wavelength link of being reserved.This optical switch layoutprocedure T consuming time
s
After node S received reservation confirmation message " CONF " and finishes its optical switch configuration operation, whole connection building process was finished, and can carry out transfer of data by the interface channel of this foundation.
The simulation result that one routine network blocking probability changes with business load as shown in Figure 3.This emulation is based upon on the NSFNET topology (14 nodes, 21 two-way links, 8 wavelength), and the business load intensity interval is set to every node 1.5-4Erlang (Ireland), and professional arrival rate is constant to be 9/minute of every nodes.As we can see from the figure, be different from Route Blocking, the size that signaling is blocked is not obvious with the variation of business load intensity.When even if intensity of load is very low, the signaling obstruction still exists and can not ignore.Clearly, the signaling blocking rate grown under three kinds of situations of conversion in no wavelength conversion, 5 wavelength conversion nodes and all-wave of the novel Signalling method that proposes of the present invention all is lower than existing RSVP-TE Signalling method.Wherein, under the long change situation of all-wave, its advantage is the most obvious.
The simulation result that one routine network blocking probability changes with professional arrival rate as shown in Figure 4.This emulation has been adopted identical topology with Fig. 3, and professional arrival rate interval is set to every node 3-18/minute, and business load intensity is constant to be every node 2.5Erlang (Ireland).As we can see from the figure, because intensity of load is very low, the Route Blocking rate maintains below 2% always, and the signaling blocking rate significantly improves with the increase of professional arrival rate, and becomes the principal element of network congestion under the situation of the professional arrival rate of height.Similar with the result of Fig. 3, the novel Signalling method that the present invention proposes can significantly reduce the signaling blocking rate.Wherein, under the long change situation of all-wave, reduce about 75% by the signaling blocking rate of this method can be with the professional arrival rate of height the time, effect is very obvious.
Should be understood that, in above narration and explanation to just explanation but not determinate of description that the present invention carried out, and do not breaking away under the prerequisite of the present invention that limits as appended claims, can carry out various changes, distortion and/or correction the foregoing description.
Claims (8)
1. the signaling method for collision avoidance is set up in the connection based on the diffusion of information optical-fiber network, it is characterized in that comprising:
On control plane server based on the diffusion of information optical-fiber network, when one first business (C1) request arrives, the source node (1 of described first business (C1), S) in its routing database, search the route and the wavelength of expense minimum, and this route and wavelength information are committed to the connection management module of source node for described first business (C1);
After the connection management module of described source node is received described route and wavelength information, send the RESV comprise described route and wavelength information to route approach node successively from this source node along described route direction, receive RESV or the resource reservation failure takes place up to the destination node of described first business (C1);
After each described route approach node receives described RESV, this route approach node is reserved its route next jump outbound port link circuit resource according to described route and wavelength information, and institute's reserved resource must not be taken by other business between advance dating.
2. according to the method for claim 1, it is characterized in that further comprising:
After described destination node receives RESV, opposite direction from described destination node along described route direction sends reservation confirmation message (CONF) to route approach node successively, till described service source node receives reservation confirmation message (CONF).
3. according to the method for claim 2, it is characterized in that further comprising:
After each described route approach node receives described reservation confirmation message (CONF), by connecting control interface (CCI) optical switch that transmits the plane is configured operation, be communicated with the wavelength link of being reserved;
After described service source node received reservation confirmation message (CONF) and finishes the optical switch configuration operation, whole connection building process was finished, and can carry out transfer of data by the interface channel of this foundation.
4. method according to claim 3 is characterized in that further comprising after some described route approach nodes are carrying out described route next jump outbound port and wavelength link circuit resource reservation failure,
In the routing database of described route approach node on the inquiry same wavelength plane through the unoccupied route of all unappropriated outbound ports expense minimum in the route of described destination node, and this outbound port and corresponding wavelength link circuit resource thereof reserved;
Replace the routing section from described route approach node to described destination node in the described route with described unoccupied route simultaneously, generate the new resources reserving message, and described new resources reserving message is sent to successively each approach node of described unoccupied route along the direction of described unoccupied route.
5. method according to claim 4 is characterized in that further comprising:
If described route approach node has the wavelength conversion ability, when other outbound ports on its same wavelength plane are all occupied, can be in other enterprising walkings along the street in convertible wavelength plane by being redirected.
6. method according to claim 5 is characterized in that described redirection of router comprises:
In the routing database of described route approach node, arrive the route of the expense minimum of described destination node through all unappropriated outbound ports on all convertible wavelength planes of inquiry, and carry out the operation of resource reservation and change/described RESV of transmission.
7. method according to claim 6 is characterized in that further comprising:
If carry out all outbound ports of node of resource reservation failure when all occupied, can start the mechanism of returning, carry out described redirection of router at one or more specified nodes of RESV process before this, comprising:
Carry out opposite direction to it on the hop node transmission heavy-route message (ReRT) of the node of resource reservation failure along described route direction;
After some nodes receive described heavy-route message (ReRT), carry out described redirection of router on same wavelength plane; If this node has the wavelength conversion ability, when carry out to continue on other convertible wavelength planes, to carry out described redirection of router after the described redirection of router failure on same wavelength plane;
If in the redirection of router failure of this node, this node continues to send heavy-route message (ReRT) along opposite direction hop node on it of described route direction, and repeats described redirection of router operation;
If when described service source node carries out described redirection of router, still fail the connection building process failure terminating.
8. method according to claim 7 is characterized in that further comprising:
Can set the upper limit that the number of times of redirection of router described in the process is set up in connection; The minimum value of this upper limit is 0, and value is that 0 interval scale does not allow to carry out redirection of router;
When after the number of times of described redirection of router reaches the capping value, still failing, then connection building process failure; This moment is from take place to connect setting up the node of failure, send to connect to route approach node successively along the opposite direction of described route direction and set up failed message (FAIL), up to described service source node receive connect set up failed message (FAIL) till;
Receive after described connection sets up failed message (FAIL) at each described route approach node, discharge its reserved resource.
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| WO2016026400A1 (en) * | 2014-08-22 | 2016-02-25 | 阿里巴巴集团控股有限公司 | Method and device for processing continuous redirection |
| WO2016206470A1 (en) * | 2015-06-26 | 2016-12-29 | 中兴通讯股份有限公司 | Automatically switched optical network resource control method, apparatus and computer readable storage medium |
| CN107105356A (en) * | 2017-03-14 | 2017-08-29 | 清华大学 | The heavy route method and system of space division multiplexing optical-fiber network |
| US11381347B2 (en) | 2015-07-30 | 2022-07-05 | Huawei Technologies Co., Ltd. | Communication method and communication device |
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| CN1592426A (en) * | 2003-09-02 | 2005-03-09 | 华为技术有限公司 | Routing method of forward constraint backward selecting |
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