CN104320356A - Partition-based spectrum allocation method - Google Patents
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Abstract
The invention discloses a partition-based spectrum allocation method for use in a flexible spectrum optical network. The method comprises the following steps: dividing spectrum resources into a plurality of regions according to the number of types of request rates, and numbering the spectrum resources in each region; mapping arriving service requests into corresponding spectrum partitions according to respective rates; computing the number of occupied frequency slots according to bandwidths required by the service requests of different rates, and selecting idle spectrum resources meeting the service request bandwidth requirements from the partitions; and establishing or blocking connection by judging whether the bit error rates of transmitted signals in the spectrum resources meet the requirements of services or not. Through adoption of the method provided by the invention, the probability of staggered arrangement of channels of different modulation formats is lowered; protection bandwidths among different modulation formats are increased; degradation of transmission quality caused by physical layer damage among the channels is reduced; and the transmission quality is effectively ensured. The method is suitable for transmitting services in the flexible spectrum optical network in which multi-rate and multi-modulation formats coexist.
Description
Technical field
The present invention relates to the frequency spectrum distributing method in a kind of multi tate flexible spectrum optical-fiber network, relate to adopt different modulating form multi-rate channel between physical layer damage evasion, and for adopting physical layer damage effect between the multi-rate channel of different modulating form to carry out the method for frequency spectrum resource distribution, belong to technical field of photo communication.
Background technology
Various lines speed is there is, as 10Gb/s, 40Gb/s and 100Gb/s etc. in multi tate flexible spectrum optical-fiber network.The signal of different rates adopts different modulation formats to modulate usually.Usually, 10Gb/s signal adopts intensity modulated, as OOK (On-off Keying, on-off keying); 40Gb/s and 100Gb/s signal adopts phase-modulation, as DQPSK (Differential Quadrature Phase Shift Keying, differential quadrature phase keying (DQPSK)) and DP-QPSK (Dual Polarization Quadrature Phase Shift Keying, dual polarization quarternary phase-shift keying (QPSK)).But intensity modulated can change the refractive index of optical fiber, cause on phase modulated signal, produce XPM (Cross Phase Modulation, Cross-phase Modulation), XPM is a kind of physical layer damage, and it can deteriorated optical signal transmission quality.And between intensity-modulated signal or between phase modulated signal, XPM effect is very little, the XPM impact that 10Gb/s channel affects the generation of comparison 40Gb/s channel to the XPM that 100Gb/s channel produces is more serious.Frequency spectrum distributing technique as distributing the key technology of frequency spectrum resource, can for having different rates, the service request of different modulating form distributes different frequency spectrum resources, evades interchannel physical layer damage effect.
In optical-fiber network, the transmission quality of signal can utilize BER (Bit Error Ratio, the error rate) to weigh.After utilizing route and frequency spectrum distributing method to distribute light path, the quality of receiving optical signals can be weighed by BER at destination.Can reduce physical layer damage effect owing to arranging protection bandwidth in intensity modulated and phase-modulation interchannel, and protect bandwidth larger, interchannel effect is less, and therefore, the syntople of channel directly affects the size of interchannel XPM effect.Can be reduced the impact of physical layer damage by the method for reserved protection bandwidth, but too much frequency spectrum is used as protecting bandwidth, can cause the wasting of resources; Carrying out spectrum allocation may when supposing that transmission quality is the worst, also can cause the waste of some available resources; The interchannel XPM be subject to because speed is higher affects larger, two-forty signal is split as multiple low-rate signal and can reduces interchannel effect.These spectrum allocation may algorithms distribute frequency spectrum resource in the method for traditional initial hit spectrum allocation may, by intensity modulated channel and phase-modulation channel mixing arrangement, make intensity modulated channel directly adjacent with phase-modulation channel.Have ignored interchannel XPM effect, cause connection request due to physical layer damage too serious and block to the deterioration of signal.
The frequency spectrum distributing method of current consideration multi tate, plurality of modulation formats interchannel XPM effect can not effectively evade interchannel effect, ensures resource utilization.The major defect of this method is: 1) arrange protection bandwidth, but does not consider the impact of protection bandwidth in resource utilization; 2) adopt FF (First Fit adapts to first) method to be that multiple-rate business distributes frequency spectrum resource, cause the mixing of phase-modulation channel and intensity modulated channel to arrange, increase interchannel XPM effect to the deterioration of transmission quality.Therefore, how in spectrum allocation may process, for interchannel XPM effect, the design that the deterioration of transmission quality, frequency spectrum resource utilization rate problem carry out frequency spectrum distributing method has been become to the emphasis of industry personnel's research.
The frequency spectrum distributing method of interchannel physical layer damage perception in the flexible spectrum optical-fiber network that main purpose of the present invention is to provide and is a kind ofly applicable to multi tate, plurality of modulation formats coexists.The method considers the physical layer damage impact of intensity modulated channel and phase-modulation interchannel, to give security the frequency spectrum resource of transmission quality for adopting the multiple-rate business of different modulating form.
Summary of the invention
The present invention adopts following technical scheme:
A kind of frequency spectrum distributing method based on subregion of multi tate flexible spectrum optical-fiber network, the method comprises the steps:
1) frequency spectrum resource is divided into multiple region according to the species number of request rate, and is numbered for the frequency spectrum resource in each region;
2) by arrive service request according to its Rate mapping in corresponding frequency spectrum subregion;
3) its frequency gap number taken of the bandwidth calculation needed for different rates service request, selects the idle frequency spectrum resource meeting service request bandwidth demand in subregion;
4) whether meet the demand of business according to the BER of signal transmission in frequency spectrum resource, set up or block connection.
Described division frequency spectrum is that multiple region is specially: if the business of a certain speed adopts intensity modulated form to modulate, then divide a region at the boundary of frequency spectrum resource and connect for this rate business; If other rate business also adopt intensity modulated, the adjoiner so in this edge spectrum region divides spectral regions, and the spectral regions namely adopting intensity modulated format rate is adjacent; Adopt the spectral regions of other rate business of phase-modulation at the another side of the spectral regions of employing intensity modulated format rate; And speed is larger, its spectral regions distance adopts the spectral regions of intensity modulated format rate far away, strengthens the protection bandwidth between phase-modulation channel and intensity modulated channel;
The described calculating taking frequently gap number is with frequency gap length degree, request rate and select the spectrum efficiency of modulation format relevant, and its value is request rate than the product of upper frequency gap length degree and spectrum efficiency;
If this service request is mapped in the spectral regions at edge, then preferentially will be in submarginal frequency spectrum resource and distribute to connection request, when resource is not enough in request corresponding region, allows to take the frequency spectrum resource in other regions, and follow the rule taking frequency spectrum resource in adjacent area;
If this service request is mapped in non-edge spectral regions (or the spectral regions mediated), preferentially frequency spectrum resource middle in this region is distributed to connection request, when in request corresponding region, resource is not enough, allow to take the frequency spectrum resource in other regions, and follow the rule taking frequency spectrum resource in adjacent area;
If there is the idling-resource meeting service request bandwidth demand, and the quality of signal transmission meets BER demand and then selects the frequency spectrum resource in this channel to connect in transmission channel, when the quality of signal transmission in channel not to meet in BER demand or all regions all without idling-resource, represent that this connection request can not be assigned with frequency spectrum resource, connection gets clogged.
The present invention has following effect: separated by the channel of the channel and intensity modulated that adopt phase-modulation as far as possible, reduce the staggered possibility of different modulating format rate channel, strengthen the protection bandwidth between two kinds of modulation format channels; Reduce interchannel XPM effect to the deterioration of transmission quality; Reduce because transmission quality does not meet the demands the blocking rate caused; Be applicable to the multiple-rate business transmission in following optical-fiber network flexibly.
Accompanying drawing explanation
Fig. 1 is frequency spectrum subregion and subregion intermediate frequency gap method for numbering serial schematic diagram; And
Fig. 2 is the spectrum allocation may schematic diagram adopting different spectral resource allocation methods.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is frequency spectrum subregion schematic diagram.If there is N kind wire rate traffic in network, wherein M kind adopts intensity modulated, and K kind adopts phase-modulation.So whole frequency spectrum resource can be divided into N number of region equably, and a M adjacent area in the left side is the spectral regions adopting intensity modulated rate business; Region, K, the right is the spectral regions adopting phase-modulation rate business.In K region, corresponding service rate from left to right raises successively.For the line speed in Fig. 1, suppose that the service rate existed in network is 10Gb/s, 40Gb/s and 100Gb/s.Then frequency spectrum resource can be divided into equably three regions, be respectively 10Gb/s region, 40Gb/s region and 100Gb/s region.The service request of these three corresponding corresponding three kinds of speed of regions difference, as shown in Fig. 1 (a).Adopt the light signal of phase-modulation to 40Gb/s and 100Gb/s speed to modulate, adopt the light signal of intensity modulated to 10Gb/s speed to modulate.Like this when zoning, 10Gb/s region is positioned at an edge of whole spectral regions, 40Gb/s and 100Gb/s region is adjacent, and is positioned at the another side of whole spectral regions.The region distance that speed is the highest adopts the place farthest, 10Gb/s region of intensity modulated.Namely 40Gb/s region mediates, and 10Gb/s region and 100Gb/s region are in the both sides in 40Gb/s region respectively.Fig. 1 (b) is the numbering of each spectral regions intermediate frequency spectrum.Fringe region frequency spectrum numbering is according to from frequency spectrum edge, order inwards increases.In 10Gb/s region, frequency gap is numbered according to the distance with 40Gb/s region, distance farthest be numbered 1, other frequently gap number consecutively be 2,3 ..., distance 40Gb/s region is more closely numbered larger, as shown in Fig. 1 (b); In 100Gb/s region, the spectrum allocation may process in its spectrum allocation may process and 10Gb/s region is similar.Frequency gap in region is numbered according to the distance with 40Gb/s region, distance farthest be numbered 1, other frequently gap number consecutivelies be 2,3 ..., distance 40Gb/s region is more closely numbered larger.The frequency spectrum numbering Ze Cong center frequency gap of zone line starts, and then alternately numbers successively according to order from about center frequently gap.The frequency gap mediated in 40Gb/s region is numbered as 1, and the left and right along middle gap frequently is alternately numbered 2,3 respectively successively ..., as shown in Fig. 1 (b).
For 10Gb/s service connection request, 40Gb/s service connection request and 100Gb/s service connection request, connection establishment process is described below, and suppose the service connection request that only there are these three kinds of speed in network, and adopt phase modulation format (DQPSK and the DP-QPSK) light signal to 40Gb/s and 100Gb/s speed to modulate, adopt intensity modulated form (OOK) light signal to 10Gb/s speed to modulate.
Concrete steps are as follows:
1, three connection requests arrive network, comprise three kinds of speed.Then business be divided into three regions as shown in Fig. 1 (a).In each region, numbering is as shown in Fig. 1 (b);
2,10Gb/s service connection request is mapped in 10Gb/s region, and 40 Gb/s service connection request are mapped in 40Gb/s region, and 100 Gb/s service connection request are mapped in 100Gb/s region;
3, the frequency gap quantity that three rate business requests need take is calculated.Taking gap number frequently can adopt formula 1 to calculate:
(formula-1)
Wherein,
s (R)for request
rthe frequency gap number taken;
b(R)for request
rspeed;
b mod for request
rthe spectrum efficiency of the modulation format adopted;
f(S)for frequency gap length degree.When adopting different modulation formats or different frequency gap lengths to spend, the frequency gap number that identical rate business takies is also different.Suppose
f(S)for 6.25GHz, then adopt OOK, during DQPSK and DP-QPSK modulation
b mod be respectively 0.4b/s/Hz, 1 b/s/Hz and 2 b/s/Hz.Can calculate according to formula 1 the frequency gap number that 10Gb/s service request, 40Gb/s service request and 100Gb/s service request take respectively and be respectively 4,7,8.Will follow spectral continuity principle when selecting idle frequency spectrum resource, if namely the service request of 10Gb/s need take 4 gaps frequently, so these 4 frequency gaps must be continuous print, as frequency gap is numbered 1,2,3,4 or 6,7,8,9;
In addition, because in network, different rates traffic carrying capacity is unknown, the transmission supporting this rate business all is not enough to for avoiding the frequency spectrum resource in certain region, and the frequency spectrum resource in other regions has residue, cause resource inefficiencies to utilize, in the frequency spectrum distributing method based on frequency spectrum subregion proposed, allow a kind of request of speed to take the frequency spectrum resource in other regions.Concrete is that each rate business selects the process of idling-resource as follows:
In 10Gb/s rate business request resource selection course, consider interchannel effect, preferentially take the available resources that in 10Gb/s region, numbering is less.If there are available resources, attempt connecting, otherwise will find in other regions available resources attempt connect.Because 10Gb/s channel has different XPM impacts to 40Gb/s and 100Gb/s channel, only take the resource on the left of 40Gb/s region, and preferentially take the idling-resource that in 40Gb/s left field, numbering is larger;
The resource selection process of 100Gb/s rate business request resource selection course and the request of 10Gb/s rate business is similar.Consider interchannel effect, preferentially take the available resources that 100Gb/s zone number is less, increase the protection bandwidth between intensity modulated channel and phase-modulation channel.If there are available resources, attempt connecting, otherwise will attempt in other regions connecting.But the request of 100Gb/s only takies the resource on the right side of 40Gb/s, and preferentially take the idling-resource that in 40Gb/s right side area, numbering is larger;
The minimum resource of 40Gb/s zone number is preferentially taken in 40Gb/s rate business request resource selection course.If there are available resources, attempt connecting, otherwise will attempt in other regions connecting.Due to phase-modulation channel between interchannel effect very little, the process that 40Gb/s request takies resource is, first takies to number maximum in 100Gb/s the region in, considers the resource taking 10Gb/s region when not having resource available again.The frequency spectrum resource that numbering is maximum is first taken when taking resource in 10Gb/s region;
In this embodiment, owing to only having three connection requests, so the service request of 10Gb/s is assigned in 10Gb/s region, the frequency spectrum resource taken be numbered 1-4; The service request of 40Gb/s is assigned in 40Gb/s region, the frequency spectrum resource taken be numbered 1-7; The service request of 100Gb/s is assigned in 100Gb/s region, the frequency spectrum resource taken be numbered 1-8;
When 4, judging that three rate business requests are transmitted on selected frequency spectrum resource respectively, whether its transmission quality meets the demand of BER, if met, connects, if do not met, blocks connection.In addition, to the connection request of arbitrary velocity, when there is not idling-resource in and if only if all operable regions or meet the frequency spectrum resource of business BER demand, block and connect.
The present invention is by carrying out the distribution of network intermediate frequency spectrum resource based on the spectrum allocation may process of frequency spectrum subregion, network performance has the following advantages: 1, the business of phase same rate is placed in same frequency spectrum subregion, and multiple regions of identical modulation format are placed in adjacent position, reduce the staggered possibility of different rates, different modulating format channel, thus reduce interchannel physical layer damage effect; 2, by the use of different spectral subregion; increase the protection bandwidth between intensity modulated channel and phase-modulation channel; thus reduce the deterioration of interchannel physical layer damage to transmission quality, reduce because optical signal transmission performance in light path does not satisfy condition the obstruction brought.
Fig. 2 adopts spectrum allocation may process to illustrate that the present invention is reducing the advantage in the blocking rate that interchannel physical layer damage causes.Suppose have four requests to arrive network successively, the speed of request is respectively 10Gb/s, 40Gb/s, 10Gb/s, 100Gb/s.Suppose that four requests take gap number frequently and are respectively 4,7,4,8.When there is no frequency spectrum subregion, utilizing FF Resources allocation, finding after Resources allocation that the request of different rates is staggered, as shown in Figure 2 (a) shows.Fig. 2 (b) is for using the result based on the frequency spectrum distributing method Resources allocation of frequency spectrum subregion; the request of different rates is assigned to zones of different; avoid being staggered of four different rates business; adopt the distance between different modulating format channel to be strengthened simultaneously; namely larger protection bandwidth is provided with; thus reduce interchannel effect, ensure that transmission quality, reduce the transmission quality obstruction because interchannel physical layer damage causes.
In the flexible spectrum optical-fiber network that the present invention considers multi tate, plurality of modulation formats coexists; the interchannel physical layer damage effect that intensity-modulated signal produces phase modulated signal; frequency spectrum resource is divided into multiple spectral regions; be mapped in different spectral regions by using the different rates business of different modulating form; reduce the staggered possibility of different modulating format channel; increase the protection bandwidth between them simultaneously; reduce the deterioration of interchannel physical layer damage to transmission quality, ensure that transmission quality.
The present invention is applicable to the flexible spectrum optical-fiber network that any multi tate plurality of modulation formats coexists; when there is speed and use modulation format to increase; can directly be expanded; by having interactional different modulating form, the channel of different rates assigns to zones of different; strengthen protection bandwidth, reduce the deterioration of damage to transmission quality.Frequency spectrum distributing method of the present invention can combine with method for routing, for connection request provides light path resource.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. based on a frequency spectrum distributing method for subregion, it is characterized in that, the method comprises the steps:
1) frequency spectrum resource is divided into multiple region according to the species number of request rate, and is numbered for the frequency spectrum resource in each region;
2) Rate mapping of service request according to request will be arrived in corresponding frequency spectrum subregion;
3) its frequency gap number taken of the bandwidth calculation needed for different rates service request, selects the idle frequency spectrum resource meeting service request bandwidth demand in subregion;
4) according to the BER(Bit Error Ratio of signal transmission in frequency spectrum resource, the error rate) whether meet the demand of business, set up or block and connect.
2. method according to claim 1, to divide frequency spectrum in described step 1) be the concrete grammar in multiple region is:
If the business of a certain speed adopts intensity modulated, then divide a region at the boundary of frequency spectrum resource and connect for this rate business; If other rate business also adopt intensity modulated, the adjoiner so in this edge spectrum region divides spectral regions, and the spectral regions namely adopting intensity modulated format rate is adjacent; Adopt the spectral regions of other rate business of phase-modulation at the another side of the spectral regions of employing intensity modulated format rate; And speed is larger, its spectral regions distance adopts the spectral regions of intensity modulated format rate far away, therefore increases the protection bandwidth between phase-modulation channel and intensity modulated channel.
3. method according to claim 1, the frequency gap number that in described step 3), different rates request takies is relevant with the spectrum efficiency of frequency gap length degree, request rate and selected modulation form, and formula 1 can be adopted to calculate;
(formula-1)
Wherein,
s (R)for request
rthe frequency gap number taken;
b(R)for request
rspeed;
b mod for request
radopt the spectrum efficiency of modulation format;
f(S)for frequency gap length degree.
4. method according to claim 1, the method for described selection idle frequency spectrum resource is specially:
If this service request is mapped in the spectral regions at edge, then preferentially will be in submarginal frequency spectrum resource and distribute to connection request, when resource is not enough in request corresponding region, allows to take the frequency spectrum resource in other region, and follow the rule taking frequency spectrum resource in adjacent area;
If this service request is mapped in non-edge spectral regions (or the spectral regions mediated), preferentially frequency spectrum resource middle in this region is distributed to connection request, when in request corresponding region, resource is not enough, allow to take the frequency spectrum resource in other regions, and follow the rule taking frequency spectrum resource in adjacent area.
5. method according to claim 1, described foundation or obstruction connection are specially:
If there is the idling-resource meeting service request bandwidth demand, and in transmission channel, the quality of signal transmission meets BER demand and then selects the frequency spectrum resource in this channel to connect; When the quality of signal transmission in channel not to meet in BER demand or all regions all without idling-resource, represent that this connection request can not be assigned with frequency spectrum resource, connection gets clogged.
6. method according to claim 1, when the modulation format number that different rates in network adopts increases, can be divided into more region by spectral regions, the business of different rates, modulation format be mapped in corresponding region.
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| CN105471732A (en) * | 2015-11-24 | 2016-04-06 | 河北工程大学 | SDN controller in optical network and physical damage perception RSA method |
| CN107181694A (en) * | 2017-07-20 | 2017-09-19 | 河北工程大学 | The route frequency spectrum distributing method that a kind of utilization multithreading is realized |
| CN113965837A (en) * | 2021-12-21 | 2022-01-21 | 华南师范大学 | Optical network dynamic spectrum partitioning method, device, storage medium and computer equipment |
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