CN103414962B - A kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access - Google Patents
A kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access Download PDFInfo
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Abstract
The invention discloses a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access, optical signal is carried out power back-off owing to introducing multistage image intensifer by LR-PON, it is possible to achieve farther distance, larger range of optical-fiber network cover.To minimize network cost for target, it is ensured that while the whole network is connective, carry out optical fiber covering based on optical network unit, multiple candidate's image intensifer and multiple candidate's beam splitter in target area.Compared with traditional PON dispositions method, this programme is towards large-scale access, its framework adopts beam splitter three rank cascade system, topological structure should be with good expansibility and space flexibility, thus allowing more users to be linked in network, extend scale and the coverage of network greatly.The relatively conventional mathematical modeling prioritization scheme of this method, reducing the time complexity of computing, thus substantially increasing the efficiency of engineering calculation, being effectively shortened operation time.
Description
Technical field
The invention belongs to Networks of Fiber Communications field, relate to long distance passive optical-fiber network (LR-PON) coverage planning problem, address the quick heuristic search method for solving of LR-PON topology optimization, solve the allocation plan problem that LR-PON fast and flexible is disposed.
Background technology
Long distance passive optical-fiber network (LongReachPassiveOpticalNetwork, LR-PON), as PON technology of future generation, the transmission range of tradition PON is extended to 100km by 20km, optical access network and Metropolitan Area Network (MAN) are integrated into a system by it, it is possible to support more massive user to access and more remote optical-fiber network covers.The impact of electromagnetic interference and thunder and lightning owing to effectively avoiding external equipment, which reduces circuit and the fault rate with external equipment, improves the reliability of system, makes networking speed fast, saves the lower deployment cost of actual light network.Therefore LR-PON network is as a kind of emerging broadband access optical fiber technology covering last one kilometer, provides reliable technical support for realizing " light entering and copper back " " fiber to the home " and following extensive fixing cloud computing user's access etc..
In actual passive optical network field, optical network unit ONU (OpticalNetworkUnit, ONU) it is the terminal unit of intelligent acess, it is with optical line terminal OLT (OpticalLineTerminal, OLT) with the use of, OLT is generally located in machine room, and ONU is arranged within the family or in corridor according to actual living needs.
About the network-building method of PON in prior art, simply it is respectively directed to and carries out independent modeling analysis in fiber-optic transfer or network capacity, cannot ensure while remote large-scale consumer intelligent acess, the capacity of the effective coverage increasing network and optical network unit ONU, taking into account transmission range and network size, also cannot effectively compensate for, when multi-user region being carried out service at a distance, the loss that signal causes in transmitting procedure.On the other hand, prior art is optimized by optimization software after being generally employing modeling, engineering information treating capacity is big, computational complexity increases and exponentially growth trend with network size, therefore computer hardware being required harshness, engineering solves the time and can not estimate, and adopts modeling and mechanical prioritization scheme, optimum results tends not to combine with practical situation, theoretical and actual have deviation.
Summary of the invention
According to prior art Problems existing, the invention discloses a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access, comprise the steps:
Step 1: initialize: set multiple optical network unit, multiple candidate's image intensifer and multiple candidate's beam splitter in target area and it is carried out serial number, actual longitude and latitude position according to optical network unit, candidate's image intensifer and candidate's beam splitter sets up two-dimensional coordinate figure with optical line terminal for initial point, and calculate the distance between optical network unit, candidate's image intensifer and candidate beam splitter three, and this distance value is stored；
Step 2: realize three rank beam splitter cascades: be connected by candidate's beam splitter nearest to optical network unit and its, above-mentioned candidate's beam splitter is defined as single order beam splitter；With square area, optical network unit is carried out minimum being completely covered, as network's coverage area, the geometric center choosing network's coverage area is initial point, central area is set up for initial radium with 1/4th of the network's coverage area length of side, candidate's beam splitter that single order beam splitter outside central area is nearest with it with in central area is connected, and above-mentioned candidate's beam splitter is defined as second order beam splitter；Calculate the meansigma methods of above-mentioned whole second order beam splitter coordinate, choose from the nearest candidate's beam splitter of this mean value coordinates as three rank beam splitters, second order beam splitter and three rank beam splitters are connected；
Step 3: realize second order image intensifer cascade: from light network termination, selects when meeting image intensifer minimum spacing threshold value from the nearest candidate's image intensifer of light network termination as single order image intensifer；When meeting image intensifer minimum spacing threshold value, select from single order image intensifer and three rank beam splitter distances and minimum candidate's image intensifer as second order image intensifer, and by second order image intensifer and three rank beam splitters connections；
Step 4: calculate link loss value, judge whether to add image intensifer: add up the output link number of each rank beam splitter, calculate every by optical network unit to light network termination link transmission loss value, if loss value is more than the highest loss threshold value set, then search between second order beam splitter and three rank beam splitters from the two distance and minimum candidate's image intensifer, and this candidate's image intensifer is connected with second order beam splitter and three rank beam splitters respectively；If loss value is less than this threshold value, then without increasing image intensifer；
Step 5: the programme of output passive optical network (LR-PON) layout: the network of the optical network unit in target area, each rank image intensifer chosen and each rank beam splitter and correspondence thereof is connected in two-dimensional coordinate and carries out mark of drawing；Export each bar respectively by the distance value of optical network unit to light network termination link and loss value；Output network design totle drilling cost and program runtime, be set as the allocation plan scheme of this LR-PON by the two-dimensional coordinate network connections scheme of output.
In step 2: after candidate's beam splitter nearest to optical network unit and its is connected, if the output link number of this candidate's beam splitter is less than the minimum output link number threshold value of single order beam splitter, then connected optical network unit is carried out sub-optimal path selection, single order beam splitter nearest to described optical network unit and its is connected.
In step 2: after candidate's beam splitter that the single order beam splitter outside central area is nearest with it with in central area is connected, if the output link number of this candidate's beam splitter is less than the minimum output link number threshold value of second order beam splitter, then connected single order beam splitter is carried out sub-optimal path selection, second order beam splitter nearest to described single order beam splitter and its is connected.
The minimum output link number threshold value of described single order beam splitter is different from the minimum output link number threshold value of described second order beam splitter.
In step 3: image intensifer spacing threshold value sets according to the practical situation of network design.
Beneficial effects of the present invention is as follows:
1. compared with traditional PON network-building method, owing to PON framework not having image intensifer, and the network architecture of this programme adopts the multistage cascade system of beam splitter, topological structure should be with good expansibility and space flexibility, therefore the addressing of multistage image intensifer is also included in during the allocation plan of this programme considers, thus allowing more user to be linked in network, extend scale and the coverage of network greatly；
2. a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access provided by the invention, relatively conventional mathematical modeling prioritization scheme, reduce the complexity of computing, it is effectively shortened operation time, thus substantially increasing the efficiency of engineering calculation, especially solve traditional method and rely on the difficult problem that optimization tool is difficult to for large scale network deployment solve, be particularly suitable for the scene of large-scale access；And result of calculation is compared with the optimal solution that optimization software obtains, this method can obtain suboptimal solution fast and effectively.
Therefore, the method for the present invention is adopted can quickly to obtain its rational allocation plan scheme for large-scale access long distance passive light net.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the present invention schematic flow sheet towards long distance passive light net (LR-PON) method of allocation plan of large-scale access.
Fig. 2 is the schematic diagram of the embodiment of the present invention.
Fig. 3 is the schematic diagram of the embodiment of the present invention.
Fig. 4 is the schematic diagram of the embodiment of the present invention.
Fig. 5 is the schematic diagram of the embodiment of the present invention.
Fig. 6 is the schematic diagram of the embodiment of the present invention.
Detailed description of the invention
For making technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear complete description:
Below the special title in the vocabulary of terms occurred in the present invention and accompanying drawing is illustrated.In figure:
Single order beam splitter Splitter: refer to the beam splitter being directly connected with optical network unit ONU；
Second order beam splitter: refer to the beam splitter being directly connected with single order beam splitter；
Three rank beam splitters: refer to the beam splitter being connected with second order beam splitter；
Single order image intensifer: refer to the image intensifer being connected with OLT；
Second order image intensifer: refer to the image intensifer being connected with three rank beam splitters；
Network's coverage area: carry out optical network unit minimum obtained region being completely covered with square area；
Central area: the candidate region for realizing two, three rank beam splitter Splitter positions, and with the geometric center of network's coverage area for initial point, 1/4th of the network's coverage area length of side set up border circular areas for initial radium；
Embodiment:
As shown in Figure 1: LRPON method of allocation plan has following steps:
Step 1: initialize: first pass through the exploration selected target region of reality, multiple optical network unit, multiple candidate image intensifer OA and multiple candidate beam splitter Splitter is set in target area, actual longitude and latitude according to its position, setting up two-dimensional coordinate figure with optical line terminal OLT for initial point, now optical network unit ONU, multiple candidate image intensifer OA and multiple candidate beam splitter Splitter fall in this two-dimensional coordinate figure according to its actual longitude and latitude position.By number consecutively after the unified arrangement of the order of light network termination OLT, candidate image intensifer OA, the last optical network unit ONU of candidate beam splitter Splitter, and calculate in two-dimensional coordinate figure between optical network unit ONU, candidate's beam splitter and candidate image intensifer OA three distance value between two respectively, and this distance value is stored.According to actual deployment scene, set allocation plan parameter, including: single order beam splitter minimum output link number threshold value, the minimum output link number threshold value of second order beam splitter, beam splitter farthest transmission range threshold value, image intensifer minimum spacing threshold value, the farthest transmission range threshold value of image intensifer and greatest path loss threshold value.
Step 2: realize three rank beam splitter cascades, candidate's beam splitter closest to optical network unit ONU and its is connected, after connection, check the output link number of these beam splitters connected by optical network unit ONU, will be greater than the beam splitter of the minimum output link number threshold value of single order beam splitter and be defined as single order beam splitter；If the output link number of the above-mentioned beam splitter connected by optical network unit ONU is less than the minimum output link number threshold value of single order beam splitter, then connected optical network unit ONU is disconnected, these optical network unit ONU are connected with the single order beam splitter meeting output link said conditions.According to shortest distance principle, the single order beam splitter nearest by optical network unit ONU and its of above-mentioned disconnection is connected.Reach optical network unit ONU is carried out the result of sub-optimal path selection.Candidate's beam splitter that method as above is finally selected is defined as single order beam splitter.As shown in Figures 2 and 3, image intensifer set POA={POA1,POA2…POA6}, beam splitter set PSP={PSP1,PSP2…PSP15}, optical network unit set PONU={PONU1,PONU2…PONU20}.All optical network unit ONU are connected to P according to shortest distance principleSP1、PSP7、PSP8、PSP9、PSP10 and PSP14.But after data analysis judges, PSP1、PSP9 and PSPThe output link number of 14 these three candidate's beam splitters is less than the minimum output link number of single order beam splitter, therefore by PSP1、PSP9 and PSPThe optical network unit ONU connected on 14 these three candidate's single order beam splitters is connected on other single order beam splitters, and selects to be connected with the single order beam splitter of its minimum distance.As shown in Figure 2: by these three candidate single order beam splitter PSP1、PSP9 and PSPThe optical network unit ONU connected on 14 is connected to the P nearest with itSP7、PSP8 and PSP10, and by PSP7、PSP8 and PSP10 are set to single order beam splitter.
With the geometric center of network's coverage area for initial point, 1/4th of the network's coverage area length of side set up central area for initial radium；According to shortest distance principle, the single order beam splitter outside this central area is connected with the candidate's beam splitter in central area.If the output link number of connected candidate's beam splitter is less than the minimum output link number threshold value of second order beam splitter, then above-mentioned single order beam splitter is carried out sub-optimal path selection, the candidate beam splitter closest by single order beam splitter and its is connected, and above-mentioned connected beam splitter is defined as second order beam splitter.As shown in Figure 4 and Figure 5, with the geometric center of network's coverage area for initial point, after 1/4th of the network's coverage area length of side set up central area for initial radium, by single order beam splitter PSP7 P that to be connected in central area nearestSP5, PSP8 and PSP10 are connected to nearest PSP15, then judge PSP5 and PSPWhether the output link number of 15 the two candidate's beam splitters is more than the minimum output link number threshold value of second order beam splitter, due to PSPThe outgoing route number of 5 is less than the minimum output link number threshold value of second order beam splitter, then to PSPThe single order beam splitter P connected on 5SP7 carry out sub-optimal path selection, by PSP7 are connected to the P nearest with itSPOn 15, and by PSP15 are defined as second order beam splitter.
Calculating the meansigma methods of the coordinate of above-mentioned selected second order beam splitter, the coordinate figure namely calculating all second order beam splitter coordinates obtains meansigma methods, chooses from the nearest candidate's beam splitter of this mean value coordinates as three rank beam splitters, second order beam splitter and three rank beam splitters is connected.Through above-mentioned connection, being connected with second order beam splitter by single order beam splitter, second order beam splitter and three rank beam splitters connect, and ultimately form the three class's connection optical splitter formation dispersed by center to surrounding.Three rank cascade structures can expand network size on the one hand, is easily achieved on the other hand and a little connects to the extension of multiple spot, is with good expansibility and space flexibility.
As shown in Figure 6, in the present embodiment, PSPThe meansigma methods of 15 coordinates is himself coordinate, therefore its nearest P of chosen distanceSP4 is three rank beam splitters.
Step 3: realize second order image intensifer cascade.From light network termination OLT, select the candidate image intensifer OA nearest with light network termination OLT as single order image intensifer when meeting from image intensifer OA distance value, as shown in Figure 6, according to actual requirement, distance value from light network termination OLT to image intensifer OA is set, when meeting more than this distance value, image intensifer OA nearest with it for light network termination OLT is connected, and using this image intensifer OA as single order image intensifer.Set under the minimum spacing threshold value premise between image intensifer OA according to actual requirement, select from single order image intensifer and three rank beam splitter distances and minimum candidate image intensifer OA as second order image intensifer, and by second order image intensifer and three rank beam splitters connections.In Fig. 6, from OLT, select the distance from OLT more than OLT-OA minimum range set in advance (such as 20 kilometers) and the P nearest with OLTOA3 as single order image intensifer, meets under the premise of the distance values between the image intensifer according to actual requirement setting, selects from POA3(single order image intensifer) and PSP4(tri-rank beam splitter) distance and minimum candidate image intensifer OA are as second order image intensifer, and by POA2 are connected with three rank beam splitters, i.e. POA2 and PSP4 connect.
Step 4: calculate link loss value, judge whether to add image intensifer: add up the output link number of each rank beam splitter, calculate every by the loss value of optical network unit to light network termination link, if loss value is more than the highest loss threshold value set, then search between second order beam splitter and three rank beam splitters from second order beam splitter and three rank beam splitter distances and minimum candidate's image intensifer, and this candidate's image intensifer is connected with second order beam splitter and three rank beam splitters respectively；If loss value is less than highest loss threshold value, then without increasing image intensifer；Such as through calculating light network termination OLT to after the loss value of the output link signal of optical network unit ONU, if this loss value is more than highest loss threshold value, then can at PSP4 and PSPCandidate image intensifer OA is selected between 15.If this loss value is less than highest loss threshold value, do not need to add candidate image intensifer OA.
Step 5: the programme of output passive optical network (LR-PON) layout: add up the numbering of the output link scheme in target area and the optical network unit of correspondence, each rank image intensifer and each rank beam splitter；Every by the distance value of optical network unit to light network termination link and loss value and program runtime, be this passive optical network path planning scheme by the output link design of scheme counted.
For large-scale LRPON dispositions method, adopt tradition optimization software to be generally difficult to solve, or namely allow to solve consuming time long, and adopt method efficiency provided by the invention to be significantly improved, and result of calculation is compared with optimization software optimization result, the two gap within the acceptable range, namely can obtain suboptimal solution.As shown in Table 1, table one is the test data of small scale network programme to comparing result, and the traditional scheme contrasted here all adopts famous Gurobi integer linear to optimize software and solves.Can be seen that the network planning scheme utilizing the present invention to obtain, the theoretical optimal solution that its network design cost obtains relative to tradition modeling optimization, the two gap is within 10%, and the number of image intensifer OA and beam splitter splitter final choice is close with theoretical optimal case；And from computation schemes time angle analysis, it can be seen that the operation time of technical scheme disclosed by the invention obtains relative to tradition modeling optimization scheme and greatly shortens, and constantly expands along with network size, more prominent the displaying of this advantage.For reducing currency conversion, in table, gcu is general cost-element (genericcostunit), is for simplifying network design cost calculation and the uniform cost unit comparing and setting in present example.
Table one:
Table two shows, when expanding network size, traditional modeling optimization scheme is difficult to solve, and there is following reason:
1. the expansion of network size, makes the quantity of variable and constraints in model exponentially increase；
2. the configuration requirement of pair computer hardware is too high, and optimizing running software calculates especially to need sufficiently large memory headroom to ensure；
3. model calculation is complicated, and the time of running is beyond acceptable time range；
And now technical scheme disclosed by the invention still can quickly try to achieve allocation plan scheme.Owing to the traditional modeling optimization of large scale network cannot direct solution, therefore the pattern that selection the present invention program is used in combination with traditional scheme, namely the result after the present invention program rapid Optimum is first passed through as initial solution, recycling traditional scheme optimizes to be similar to further tries to achieve theoretially optimum value, and make it compared with the result that the present invention program independently solves, can find out clearly, network design cost still may remain within the scope of acceptable cost budgeting, and there is absolute advantage the operation time of this programme, it is thus possible to provide feasible high-quality scheme to extensive long distance passive optical network plan within the shortest time.Comparing result is as shown in Table 2:
Table two:
LRPON method of allocation plan disclosed by the invention computational efficiency can significantly improve when ensureing to try to achieve suboptimal solution, solve traditional method and rely on the difficult problem that optimization tool is difficult to for large scale network deployment solve, being particularly suitable for the scene of large-scale consumer intelligent acess, this LRPON allocation plan scheme has distance covering, extensive, support two-forty, the reliable feature accessed.
The above; it is only the present invention preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope that the invention discloses; it is equal to replacement according to technical scheme and inventive concept thereof or is changed, all should be encompassed within protection scope of the present invention.
Claims (5)
1., towards long distance passive light net (LR-PON) method of allocation plan for large-scale access, cover for realizing the intelligent acess network in target area, it is characterised in that: the method comprises the following steps:
Step 1: initialize: set multiple optical network unit, multiple candidate's image intensifer and multiple candidate's beam splitter in target area and it is carried out serial number, actual longitude and latitude position according to optical network unit, candidate's image intensifer and candidate's beam splitter sets up two-dimensional coordinate figure with optical line terminal for initial point, and calculate the distance between optical network unit, candidate's image intensifer and candidate beam splitter three, and this distance value is stored；
Step 2: realize three rank beam splitter cascades: be connected by candidate's beam splitter nearest to optical network unit and its, after connection, check the output link number of these beam splitters connected by optical network unit, will be greater than the beam splitter of the minimum output link number threshold value of single order beam splitter and be defined as single order beam splitter；With square area, optical network unit is carried out minimum being completely covered, as network's coverage area, the geometric center choosing network's coverage area is initial point, central area is set up for initial radium with 1/4th of the network's coverage area length of side, candidate's beam splitter that single order beam splitter outside central area is nearest with it with in central area is connected, if the output link number of connected candidate's beam splitter is more than the minimum output link number threshold value of second order beam splitter, and above-mentioned candidate's beam splitter is defined as second order beam splitter；Calculate the meansigma methods of above-mentioned whole second order beam splitter coordinate, choose from the nearest candidate's beam splitter of this mean value coordinates as three rank beam splitters, second order beam splitter and three rank beam splitters are connected；
Step 3: realize second order image intensifer cascade: from light network termination, selects when meeting image intensifer minimum spacing threshold value from the nearest candidate's image intensifer of light network termination as single order image intensifer；When meeting image intensifer minimum spacing threshold value, select from single order image intensifer and three rank beam splitter distances and minimum candidate's image intensifer as second order image intensifer, and by second order image intensifer and three rank beam splitters connections；
Step 4: calculate link loss value, judge whether to add image intensifer: add up the output link number of each rank beam splitter, calculate every by optical network unit to light network termination link transmission loss value, if loss value is more than the highest loss threshold value set, then search between second order beam splitter and three rank beam splitters from the two distance and minimum candidate's image intensifer, and this candidate's image intensifer is connected with second order beam splitter and three rank beam splitters respectively；If loss value is less than this threshold value, then without increasing image intensifer；
Step 5: the programme of output long distance passive light net (LR-PON) layout: the network of the optical network unit in target area, each rank image intensifer chosen and each rank beam splitter and correspondence thereof is connected in two-dimensional coordinate and carries out mark of drawing；Export each bar respectively by the distance value of optical network unit to light network termination link and loss value；Output network design totle drilling cost and program runtime, be set as the allocation plan scheme of this long distance passive light net LR-PON by the two-dimensional coordinate network connections scheme of output.
2. a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access according to claim 1, it is further characterized in that: in step 2: after candidate's beam splitter nearest to optical network unit and its is connected, if the output link number of this candidate's beam splitter is less than the minimum output link number threshold value of single order beam splitter, then connected optical network unit is carried out sub-optimal path selection, single order beam splitter nearest to described optical network unit and its is connected.
3. a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access according to claim 1, it is further characterized in that: in step 2: after candidate's beam splitter that the single order beam splitter outside central area is nearest with it with in central area is connected, if the output link number of this candidate's beam splitter is less than the minimum output link number threshold value of second order beam splitter, then connected single order beam splitter is carried out sub-optimal path selection, second order beam splitter nearest to described single order beam splitter and its is connected.
4. a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access according to claim 1, is further characterized in that: the minimum output link number threshold value of described single order beam splitter is different from the minimum output link number threshold value of described second order beam splitter.
5. a kind of long distance passive light net (LR-PON) method of allocation plan towards large-scale access according to claim 1, is further characterized in that: in step 3: image intensifer spacing threshold value sets according to the practical situation of network design.
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| CN113965834B (en) * | 2020-07-20 | 2023-09-19 | ***通信集团安徽有限公司 | Method and device for detecting problems of optical distribution network |
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