CN102377674A - Path computation result-based conflict-avoiding wavelength assignment method - Google Patents
Path computation result-based conflict-avoiding wavelength assignment method Download PDFInfo
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Abstract
The invention discloses a path computation result-based conflict-avoiding wavelength assignment method, which relates to the field of wavelength switched optical networks. The method includes the following steps: the explicit route of a newly established optical path is worked out and then sent to a source node, the link information contained in the newly established optical path is compared with existing optical paths in a links contained table (LCT), and if same links are contained, the existing optical paths are stored in a conflict avoidance table (CAT) and the newly established optical path is stored in the LCT, or else the newly established optical path is directly stored into the LCT; (c) the source node sends a Path message to a destination node, and obtains an optical path available wavelength set; (d) if the optical path available wavelength set is empty, a Path Err message is sent and step c is executed, or else a reserved wavelength is selected; (e) a RESVReq message is sent; (f) if available, the current reserved wavelength is stored into the LCT and a Resv message is sent, or else a new reserved wavelength is selected and step e is executed. By using the method, the blocking rate of a network can be decreased.
Description
Technical field
The present invention relates to the wavelength switched optical network technical field, Wavelength allocation method is avoided in particularly a kind of conflict based on calculation road result.
Background technology
Along with the rapid growth of network bandwidth requirements, limited wavelength resource will inevitably become the bottleneck of following development of optical network.The proposition of WSON (Wavelength Switched Optical Network, wavelength switched optical network) is exactly in order fast and effeciently to provide and remove light path, makes full use of the existing wavelength resource of network.In the WSON framework, route and Wavelength Assignment are key issues.Occur a large number of services application at short notice or in official hour, recover a large amount of original when professional, the competition that resource will occur with conflict.
GMPLS (Generalized Multiprotocol Label Switching; The exchange of general multiple protocols label) network is through introducing distributed control plane in photosphere; Realized dynamically, in real time, the configuration of Internet resources as required and management; Through continuity on original notion and technical foundation and development, brought great change for existing transmission network architecture.Control plane changes by distributed node through the partial function that former cause centralized network tube apparatus is accomplished to be accomplished, and has improved networks efficiency.
Resource reservation is the intelligentized key technology of distributed optical network.It uses certain route and signaling protocol, realizes the reservation to the particular network resource.The resource reservation technology is the basis of realizing connecting such as exchange various intellectualized operations such as foundation, network protection and recovery.In the wavelength division multiplexed optical network that is the basis with the wavelength route, also often be called as the Wavelength reservation technology.
In the network of no wavelength transfer capability, traditional wavelength selection algorithm has three kinds, is respectively FF (First Fit adapts at first), RF (random adaptation, Random Fit) and LF (adapting to Last Fit at last).It is generally acknowledged that FF and LF are applicable to the situation that offered load is lower, blocking rate is smaller; And RF is applicable to that offered load is than the situation higher, that blocking rate is bigger.Traditional Wavelength reservation strategy has two kinds, is respectively SIR (Source-Initiated Reservation, forward direction begins reservation policy) and DIR (Destination-Initiated Reservation, the back is to the beginning reservation policy).SIR directly reserves a plurality of wavelength resources in the forward direction reservation stage, and after the destination node was confirmed reserved resource, the back discharged unnecessary reserved resource to reservation stage.DIR only preserves the available resources collection in the forward direction reserved resource stage in signaling, after the destination node was confirmed reserved resource, the resource of confirming was reserved in the back to reservation stage.
Use the resource contention that exists in the GMPLS network of RSVP-TE (Resource ReSerVation Protocol-Traffic Engineering is based on the RSVP of traffic engineering expansion) agreement can be divided into two kinds.A kind of is the forward direction resource contention, and this is to cause owing to lacking corresponding resource in the network; Another kind is back to resource contention, and this is because the resource reservation competition produces.Wherein, the back accounts for leading role in the blocking rate of resource contention at network, and never solves well.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: how to provide a kind of and avoid Wavelength allocation method based on the conflict of calculating the road result, so that reduce the back probability to resource contention of network, and then reduce the blocking rate of network.
(2) technical scheme
For solving the problems of the technologies described above, the present invention provides a kind of and avoids Wavelength allocation method based on the conflict of calculating the road result, and it comprises step:
B:PCE calculates the explicit route of corresponding newly-built light path according to the road construction request; Said explicit route is sent to source node; Existing light path contrasts successively in link information that said newly-built light path is comprised and the LCT table, judges whether both comprise identical link, if; The relevant information of said existing light path is saved in the CAT table, the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table; Otherwise, directly the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table;
C: said source node sends Path message to destination node, and said Path message obtains the light path wavelength available collection of said newly-built light path through every section link that said newly-built light path comprised according to the link wavelength available collection of every section link;
D: after destination node is received said Path message, judge whether said light path wavelength available collection is empty, if be empty, said destination node is sent PathErr message to said source node, carries out said step C then; Otherwise, concentrate wavelength of selection as reserving wavelength from said light path wavelength available;
E: said destination node is sent RESVReq message to said PCE, and said RESVReq message comprises the Path ID and the current reservation wavelength of said newly-built light path;
F: after said PCE receives said RESVReq message, judge according to information in the said CAT table whether current reservation wavelength is available, if available, execution in step G; Otherwise said PCE notifies said destination node to concentrate new wavelength of selection as reserving wavelength, execution in step E then from said light path wavelength available;
G: the choose wavelength of current reservation wavelength as said newly-built light path is saved among the said LCT, and said PCE notifies said destination node to send Resv message.
Preferably, before said step B, also comprise steps A: said source node is to said PCE path computation request, and the said newly-built light path from said source node to said destination node is set up in request.
Preferably, after said step G, also comprise step H: intermediate node carries out resource reservation after receiving said Resv message.
Preferably, also comprise step I after the said step H: after said source node is received said Resv message, delete said CAT table, and delete the relevant information of corresponding said newly-built light path in the said LCT table.
Preferably, said step B specifically comprises step:
B1:PCE calculates the explicit route of corresponding newly-built light path according to the constraints of TED and road construction request;
B2: said explicit route is sent to source node;
B3: existing light path contrasts successively in link information that said newly-built light path is comprised and the LCT table, judges whether both comprise identical link, if, with the Path ID of said existing light path with choose wavelength to be saved in the CAT table, execution in step B4 then; Otherwise, direct execution in step B4;
B4: the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table.
Preferably, said step C specifically comprises step:
C1: said source node sends Path message to destination node, said Path message process every section link that said newly-built light path comprised;
C2: calculate the common factor of the link wavelength available collection of every section link that said newly-built light path comprises, obtain the light path wavelength available collection of said newly-built light path.
Preferably, said step D specifically comprises step:
D1: after said destination node is received said Path message, judge whether said light path wavelength available collection is empty, if be empty, execution in step D2; Otherwise execution in step D3;
D2: said destination node is sent PathErr message along the rightabout of said explicit route to said source node, carries out said step C then;
D3: use at first adaptive algorithm to concentrate and select a wavelength as reserving wavelength from said light path wavelength available.
Preferably, said step F specifically comprises step:
F1: after said PCE receives said RESVReq message, extract the Path ID and the current reservation wavelength of said newly-built light path;
F2: whether that judges each existing light path in the said CAT table successively chooses wavelength identical with current reservation wavelength, if all inequality, judges that current reservation wavelength can use execution in step G; Otherwise, execution in step F3;
F3: said PCE notifies said destination node to concentrate new wavelength of selection as reserving wavelength, execution in step E then from said light path wavelength available.
(3) beneficial effect
According to the inventionly avoid Wavelength allocation method based on the conflict of calculating the road result, the link information through every light path of LCT table record with choose wavelength, and make up the CAT table with this; May there be the information of the light path that conflict with newly-built light path through the CAT table record, and confirms to choose wavelength, can effectively reduce the back probability of network to resource contention with this, and then the blocking rate of reduction network.
Description of drawings
Fig. 1 is that the Wavelength allocation method flow chart is avoided in the said conflict based on calculation road result of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Present embodiment is example with the GMPLS network that uses the RSVP-TE agreement, avoids the wavelength method to specify according to the invention based on the conflict of calculating the road result.Fig. 1 is that the Wavelength allocation method flow chart is avoided in the said conflict based on calculation road result of the embodiment of the invention.As shown in Figure 1, said method comprises:
Steps A: after source node is received professional foundation request; As PCC (Path Computation Clients; Path computing request client) through PCEP (Path Computation Element Communication Protocol; Path-calculating element communication protocol) send a paths computation request message to PCE (Path Computation Element, path-calculating element), a newly-built light path from said source node to destination node is set up in request.
Step B: said PCE calculates the explicit route of corresponding said newly-built light path according to the road construction request; Said explicit route is sent to source node; Existing light path contrasts successively in link information that said newly-built light path is comprised and the LCT table, judges whether both comprise identical link, if; The relevant information of said existing light path is saved in the CAT table, the Path ID (path label) of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table; Otherwise, directly the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table.
Said step B specifically comprises step:
Step B1: said PCE calculates the explicit route of a said newly-built light path of correspondence according to the constraints of TED (Traffic Engineering Database, traffic engineering database) and road construction request.
Step B2: said explicit route is sent to said source node.
Step B3: existing light path contrasts successively in link information that said newly-built light path is comprised and the LCT table; Judge whether both comprise identical link; If, with the Path ID of said existing light path, choose wavelength and both same link to be saved in the CAT table, execution in step B4 then; Otherwise, direct execution in step B4.
Table 1 is an example LCT table, and is as shown in table 1, LCT (Links contained Table is that the self-defining link of present embodiment comprises tabulation) table, comprising: have light path Path ID, the link that comprises, choose wavelength.Wherein, choose one of wavelength possibly be sky, represent this light path for sky and do not confirm to choose wavelength as yet.
Table 1 example LCT table
| Path?ID | Comprise link | Choose wavelength |
| Path?1 | Link 1; Link 2; Link 5 | λ1 |
| Path?4 | Link 2; Link 3; | |
| Path?5 | Link 1; Link 3; Link 4; Link 5 | λ4 |
Table 2 is example CAT tables; As shown in table 2; CAT (Collision Avoidance Table; Be the self-defining collision of present embodiment avoid the tabulation) table, comprising: with said newly-built light path possibly produce the existing light path of resource contention (promptly containing same link) Path ID, choose wavelength, same link.The Path ID that at present supposes said newly-built light path is Path 7; Institute comprises link to be had: link 3, link 4, link 6.After then carrying out said step B3, gained is just as shown in table 2 to CAT table that should newly-built light path.
Table 2 example CAT table
| Path?ID | Choose wavelength | Same link |
| Path?4 | Link 3; | |
| Path?5 | λ4 | Link 3; Link 4; |
Step B4: the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table.Be the consistency of guarantee information, said LCT table has only one in whole network system, when new light path occurs, all can correspondingly upgrade said LCT table.Also with the above-mentioned example that is assumed to be, then said newly-built light path this moment information in said LCT table comprises: Path ID is Path7; Comprising link has: link 3, link 4, link 6; It is empty choosing wavelength.
Step C: said source node sends Path message (being PATH) to said destination node; Said Path message obtains the light path wavelength available collection of said newly-built light path through every section link that said newly-built light path comprised according to the link wavelength available collection of every section link.
Said step C specifically comprises step:
Step C1: said source node sends Path message to destination node, said Path message process every section link that said newly-built light path comprised.After state this process be called for short the Path process.
Step C2: calculate the common factor of the link wavelength available collection of every section link that said newly-built light path comprises, obtain the light path wavelength available collection of said newly-built light path.Before said newly-built light path occurred, every section link that it comprised all maybe be shared by other light paths, and corresponding wavelength is also occupied, and remains the link wavelength available collection that unappropriated wavelength constitutes this section link.And then; The common factor of the link wavelength available collection through calculating every section link that said newly-built light path comprises; Can obtain the light path wavelength available collection of said newly-built light path; Promptly there is high probability can supply the set (because there is time delay in the Path process, these wavelength still possibly chosen by other light paths as before choosing wavelength being confirmed by said newly-built light path) of the wavelength that said newly-built light path selects for use.
Step D: after said destination node is received said Path message, judge whether said light path wavelength available collection is empty, if be empty, said destination node is sent PathErr message (a kind of path error messages) to said source node, carries out said step C then; Otherwise, concentrate wavelength of selection as reserving wavelength from said light path wavelength available.
Said step D specifically comprises:
Step D1: after said destination node is received said Path message, judge whether said light path wavelength available collection is empty, if be empty, execution in step D2; Otherwise execution in step D3;
Step D2: said destination node is sent PathErr message along the rightabout of said explicit route to said source node, carries out said step C then.Be because there is time delay in the Path process equally, therefore, when carrying out said step C once more, possibly have the long resource of subwave and be released, thereby make light path wavelength available collection for empty.
Step D3: use at first adaptive algorithm to concentrate and select a wavelength as reserving wavelength from said light path wavelength available.
Step e: said destination node is sent RESVReq message (a kind of request message) to said PCE, and said RESVReq message comprises the Path ID and the current reservation wavelength of said newly-built light path.
Step F: after said PCE receives said RESVReq message, judge according to information in the said CAT table whether current reservation wavelength is available, if available, execution in step G; Otherwise said PCE notifies said destination node to concentrate new wavelength of selection as reserving wavelength, execution in step E then from said light path wavelength available.
Said step F specifically comprises:
Step F 1: after said PCE receives said RESVReq message, extract the Path ID and the current reservation wavelength of said newly-built light path.
Step F 2: whether that judges each existing light path in the said CAT table successively chooses wavelength identical with current reservation wavelength, if all inequality, judges that current reservation wavelength can use execution in step G; Otherwise, execution in step F3.
Step F 3: said PCE notifies said destination node to concentrate new wavelength of selection as reserving wavelength, execution in step E then from said light path wavelength available.
Continuation is that the newly-built light path of Path 7 is an example with the Path ID of above-mentioned hypothesis, and supposes that its wavelength available is concentrated and comprise wavelength available λ 4 and λ 5, and current reservation wavelength is λ 4.When then carrying out said step F 2, checking said table 2, is the light path contrast of Path4 with the 1st row Path ID at first, and it chooses wavelength is empty, is different from λ 4; And then with the second row Path ID be the light path contrast of Path5, it chooses wavelength is λ 4; And then carry out said step F 3, current reservation wavelength is updated to λ 5, carry out said step e after; Carry out said step F 2 once more, check said table 2 once more, the wavelength of choosing of the light path in two line items all is different from λ 5; Judge that current reservation wavelength X 5 can use, state step G after the execution.
Step G: the choose wavelength of current reservation wavelength as said newly-built light path is saved among the said LCT, and said PCE notifies said destination node to send Resv message (a kind of message of RSVP).
Step H: intermediate node carries out resource reservation after receiving said Resv message.
Step I: after said source node is received said Resv message, delete said CAT table, and delete the relevant information of corresponding said newly-built light path in the said LCT table.After said source node was received said Resv message, expression whole service process finished, and at this moment deleted said CAT table, and deleted the relevant information of corresponding said newly-built light path in the said LCT table, free system resources timely, especially limited wavelength resource.
The embodiment of the invention is said avoids Wavelength allocation method based on the conflict of calculating the road result, the link information through every light path of LCT table record with choose wavelength, and make up the CAT table with this; May there be the information of the light path that conflict with newly-built light path through the CAT table record, and confirms to choose wavelength, can effectively reduce the back probability of network to resource contention with this, and then the blocking rate of reduction network.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. Wavelength allocation method is avoided in the conflict based on calculation road result, it is characterized in that, comprises step:
B:PCE calculates the explicit route of corresponding newly-built light path according to the road construction request; Said explicit route is sent to source node; Existing light path contrasts successively in link information that said newly-built light path is comprised and the LCT table, judges whether both comprise identical link, if; The relevant information of said existing light path is saved in the CAT table, the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table; Otherwise, directly the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table;
C: said source node sends Path message to destination node, and said Path message obtains the light path wavelength available collection of said newly-built light path through every section link that said newly-built light path comprised according to the link wavelength available collection of every section link;
D: after destination node is received said Path message, judge whether said light path wavelength available collection is empty, if be empty, said destination node is sent PathErr message to said source node, carries out said step C then; Otherwise, concentrate wavelength of selection as reserving wavelength from said light path wavelength available;
E: said destination node is sent RESVReq message to said PCE, and said RESVReq message comprises the Path ID and the current reservation wavelength of said newly-built light path;
F: after said PCE receives said RESVReq message, judge according to information in the said CAT table whether current reservation wavelength is available, if available, execution in step G; Otherwise said PCE notifies said destination node to concentrate new wavelength of selection as reserving wavelength, execution in step E then from said light path wavelength available;
G: the choose wavelength of current reservation wavelength as said newly-built light path is saved among the said LCT, and said PCE notifies said destination node to send Resv message.
2. the method for claim 1 is characterized in that, before said step B, also comprises steps A: said source node is to said PCE path computation request, and the said newly-built light path from said source node to said destination node is set up in request.
3. the method for claim 1 is characterized in that, after said step G, also comprises step H: intermediate node carries out resource reservation after receiving said Resv message.
4. method as claimed in claim 3 is characterized in that, also comprises step I after the said step H: after said source node is received said Resv message, delete said CAT table, and delete the relevant information of corresponding said newly-built light path in the said LCT table.
5. the method for claim 1 is characterized in that, said step B specifically comprises step:
B1:PCE calculates the explicit route of corresponding newly-built light path according to the constraints of TED and road construction request;
B2: said explicit route is sent to source node;
B3: existing light path contrasts successively in link information that said newly-built light path is comprised and the LCT table, judges whether both comprise identical link, if, with the Path ID of said existing light path with choose wavelength to be saved in the CAT table, execution in step B4 then; Otherwise, direct execution in step B4;
B4: the Path ID of said newly-built light path and the link information that is comprised thereof are saved in the said LCT table.
6. the method for claim 1 is characterized in that, said step C specifically comprises step:
C1: said source node sends Path message to destination node, said Path message process every section link that said newly-built light path comprised;
C2: calculate the common factor of the link wavelength available collection of every section link that said newly-built light path comprises, obtain the light path wavelength available collection of said newly-built light path.
7. the method for claim 1 is characterized in that, said step D specifically comprises step:
D1: after said destination node is received said Path message, judge whether said light path wavelength available collection is empty, if be empty, execution in step D2; Otherwise execution in step D3;
D2: said destination node is sent PathErr message along the rightabout of said explicit route to said source node, carries out said step C then;
D3: use at first adaptive algorithm to concentrate and select a wavelength as reserving wavelength from said light path wavelength available.
8. the method for claim 1 is characterized in that, said step F specifically comprises step:
F1: after said PCE receives said RESVReq message, extract the Path ID and the current reservation wavelength of said newly-built light path;
F2: whether that judges each existing light path in the said CAT table successively chooses wavelength identical with current reservation wavelength, if all inequality, judges that current reservation wavelength can use execution in step G; Otherwise, execution in step F3;
F3: said PCE notifies said destination node to concentrate new wavelength of selection as reserving wavelength, execution in step E then from said light path wavelength available.
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Application publication date: 20120314 |