CN102377525B - Self-adaptive adjustment method and self-adaptive adjustment system for transmitters - Google Patents
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Abstract
本发明公开了一种发射机自适应调节方法，涉及光网络技术领域，包括以下步骤：S1：光网络中的新业务源节点获取其与旧业务源节点的发射机参数差值，所述新业务源节点和旧业务源节点是具有共同目的节点的源节点；S2：所述新业务源节点根据所述差值调节自身的发射机参数，使自身的发射机参数与旧业务源节点的发射机参数一致。还公开了一种发射机自适应调节系统。本发明避免了因发射机不同而导致的业务间功率和相位的差异，从而保证了不同业务的子载波的正交性，也不会影响子载波解调、分离后信号的质量，进而提高了系统性能，降低了误码率。
The invention discloses a method for self-adaptive adjustment of a transmitter, which relates to the technical field of optical networks, and includes the following steps: S1: A new service source node in the optical network acquires a difference in transmitter parameters between itself and an old service source node, and the new The service source node and the old service source node are source nodes with a common destination node; S2: The new service source node adjusts its own transmitter parameters according to the difference, so that its own transmitter parameters are consistent with those of the old service source node The machine parameters are the same. Also disclosed is a transmitter adaptive adjustment system. The present invention avoids the differences in power and phase between services caused by different transmitters, thereby ensuring the orthogonality of subcarriers of different services, and will not affect the quality of signals after subcarrier demodulation and separation, thereby improving System performance, reducing the bit error rate.
Description
Technical field
The present invention relates to flexible spectrum optical-fiber network technical field, particularly a kind of transmitter adaptive regulation method and system.
Background technology
In at present relevant flexible spectrum optical-fiber network, the object of traffic grooming is in order to reduce the protection interval (guard band) between different business, thereby saves more frequency spectrum resource.Due to the characteristic of optical filter, between different business, need certain protection bandwidth to do not affect at Nodes under the prerequisite of service feature and carry out effective filtering.By photosphere traffic grooming strategy, can effectively save the waste that optical filter device limits the protection bandwidth (guard band) of bringing.Flexible spectrum all-optical network traffic grooming as shown in Figure 1, low speed business is as A-> B, A-> D, C-> B, C-> D, is mapped to by business in the light path of flexible spectrum.In order to guarantee the integrality of light signal in whole end-to-end light path, in the both sides of business, can be provided with the protection interval (width at protection interval is depending on different performance of filters) of certain width.In order to reduce the number of protection bandwidth; traffic grooming method by the traffic grooming of chummage to same continuous frequency spectrum band; as shown in Figure 1; going to subservice A-> B and the C-> B that B orders dredges in a large business frequency range; can save like this A-> B and C-> B between protection interval, only need do the reception of unified OFDM (Orthogonal Frequency Division Multiplexing) subcarrier at receiving terminal B point.In like manner go to subservice A-> D and the C-> D that D orders and also can adopt same traffic grooming method.In light OFDM (O-OFDM) system, this dredging normally carried out in photosphere, so the OFDM subcarrier of two business must meet orthogonality.Can effectively improve the resource utilization of all optical network by this method.
In flexible spectrum optical-fiber network, physical layer adopts OFDM technology.OFDM is because orthogonality allows between subcarrier aliasing mutually, thereby improved the availability of frequency spectrum.From operational angle, investigating, is that quadrature is overlapping between the subcarrier distributing in the business of every road, and the bandwidth (Guard band) that still needs protection between different business is for switching node disassociation service in link.Protection interval between business has reduced bandwidth resources utilance.For this situation, a kind of all-optical network traffic grooming strategy can be eliminated the protection interval between chummage business, at receiving terminal demodulation simultaneously, disassociation service subcarrier, and then has improved the availability of frequency spectrum.
As shown in Figure 1, under flexible spectrum optical-fiber network, the electric layer service of a plurality of low speed is mapped in adaptive-bandwidth light path by business interface, and wherein the traffic grooming of chummage is in a continuous wavestrip.The > B of A-shown in figure and C-> B and A-> D and C-> D are this class chummage business, under photosphere traffic grooming, have saved the protection bandwidth between business.
Yet this strategy is not considered the impact of optical signal quality: in actual network environment, the business of different source nodes converges to identical destination node after sending, and the generation of its signal and the path of process are incomplete same.Therefore the physical characteristic that, service signal shows is also different.These physical factors may comprise decay, dispersion, non-linear, noise, time delay etc.In OFDM subcarrier demodulation process, embody a concentrated reflection of as the amplitude of subcarrier between different business and the difference of phase place (time delay).This species diversity has been destroyed the orthogonality between subcarrier, thereby affects the quality of subcarrier demodulation, separated rear signal, and its damage cost can reduce systematic function, increases the error rate.
In Fig. 1, A is different from the physical characteristic that the business of C shows when converging, and after converging, between subcarrier, has difference power Δ P, phase difference ΔΦ.On B and D, OFDM receiver is responsible for demodulation, disassociation service subcarrier.Therefore the inter-carrier interference that, power, phase difference cause can produce considerable influence to the demodulation performance of receiver.The generation of this situation is because the business of different source nodes is to be sent by different transmitters to a great extent, and different transmitters has different transmitting powers and phase place, thereby has caused the difference of power and phase place between business.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to avoid the difference because of power and phase place between the different business that cause of transmitter.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of transmitter adaptive regulation method, comprise the following steps:
S1: the new business source node in optical-fiber network obtains the transmitter parameter difference of itself and old service source node, and described new business source node and old service source node are the source nodes with common purpose node;
S2: described new business source node regulates the transmitter parameter of self according to described difference, make the transmitter parameter of self consistent with the transmitter parameter of old service source node.
Wherein, in described step S1, the mode of obtaining described parameter difference comprises step:
The mode of described new business source node by Signalling exchange sent the connection request that comprises self transmitter parameter to described destination node;
Described destination node is according to wherein the transmitter parameter of described old service source node and the transmitter parameter of new business source node of record calculate described parameter difference;
Described destination node sends described parameter difference by the mode of described Signalling exchange to described new business source node.
Wherein, in described step S1, the mode of obtaining described parameter difference comprises step:
In the optical-fiber network of described new business source node inquiry self storage, the transmitter parameter database of all nodes, finds and the transmitter parameter that self has the old service source node of common purpose node;
Calculate described parameter difference.
Wherein, before described step S1, also comprise:
After each business in described optical-fiber network connects, the mapping relations of the transmitter parameter of source node and destination node are flooded to other node in optical-fiber network, to upgrade transmitter parameter database wherein.
Wherein, in described step S1, after obtaining described parameter difference, also comprise:
Judge whether described parameter difference exceeds predetermined error range, if now there are a plurality of old service source nodes, described parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values, if exceed described error range, perform step S2, otherwise new business source node keeps transmitter raw parameter.
Wherein, after described step S2, also comprise:
S3: the transmitter of described new business source node is transmitted into destination node by business information by optical-fiber network according to current parameter.
The present invention also provides a kind of transmitter self-adaption regulation system, comprising:
Parameter difference acquisition module, for the new business source node of optical-fiber network, obtain the transmitter parameter difference of itself and old service source node, described new business source node and old service source node are the source nodes with common purpose node, and two service needed are carried out photosphere traffic grooming;
Parameter adjustment module, regulates the transmitter parameter of self according to described difference for described new business source node, make the transmitter parameter of self consistent with the transmitter parameter of old service source node.
Wherein, described parameter difference acquisition module comprises:
Connection request module, the mode for described new business source node by Signalling exchange is sent the connection request that comprises self transmitter parameter to described destination node;
Parameter difference computing module, calculates described parameter difference for described destination node according to the transmitter parameter of described old service source node and the transmitter parameter of new business source node that wherein record;
Parameter difference is returned to module, and the mode for described destination node by described Signalling exchange sends described parameter difference to described new business source node.
Wherein, described parameter difference acquisition module comprises:
Database lookup module, the transmitter parameter database of all nodes of optical-fiber network of self storing for described new business source node inquiry, finds and the transmitter parameter that self has the old service source node of common purpose node;
Parameter difference computing module, for calculating described parameter difference.
Wherein, described system also comprises:
Parameter information synchronization module, after connecting, is flooded to other node in optical-fiber network by the mapping relations of the transmitter parameter of source node and destination node, to upgrade transmitter parameter database wherein for each business of described optical-fiber network.
Wherein, described system also comprises:
Self adaptation test and appraisal module, for judging whether described parameter difference exceeds predetermined error range, if now there are a plurality of old service source nodes, described parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values, if exceed described error range, execution parameter adjustment module, otherwise new business source node keeps transmitter raw parameter.
(3) beneficial effect
The present invention is by regulating the transmitter parameter of new business source node consistent with the transmitter parameter of old service source node, avoided the difference because of power and phase place between the different business that cause of transmitter, thereby guaranteed the orthogonality of the subcarrier of different business, can not affect the quality of subcarrier demodulation, separated rear signal yet, and then improved systematic function, reduced the error rate.
Accompanying drawing explanation
Fig. 1 is frequency spectrum elastic variable optical networks layer traffic grooming schematic diagram;
Fig. 2 is a kind of transmitter adaptive regulation method flow chart of the embodiment of the present invention;
Fig. 3 is that in the method for Fig. 2, transmitter self adaptation regulates signaling schemes schematic diagram;
Fig. 4 is that in the method for Fig. 2, transmitter self adaptation regulates route synchronization scenario schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Because the light OFDM transmitter of different source nodes there are differences, cause the parameter (power magnitude and phase place) of the light ofdm signal that produces different, therefore in traffic grooming process, produce unnecessary signal cross-talk, had a strong impact on the reception of ofdm signal.The present invention is by reducing or eliminating this species diversity and reduce signal cross-talk unnecessary in traffic grooming process, thereby do not affected the reception of ofdm signal.In flexible spectrum optical-fiber network of the present invention towards the transmitter adaptive regulation method of photosphere traffic grooming equally in all-optical network traffic grooming be to carry out at photosphere.New business source node herein refers to will be to the source node of destination node transmitting business in optical-fiber network, and old service source node refers to the source node that sent business before new business source node to same destination node.Node refers to transmission node in optical-fiber network, each node comprises that hardware-switch entity realizes light path exchange as ROADM or OXC, realize mutual (as route and the signaling) of the protocol software with control plane entity (Control Plane Entity, CPE).
As shown in Figure 2, transmitter adaptive regulation method of the present invention comprises:
Step S201, the new business source node in optical-fiber network obtains the transmitter parameter difference of itself and old service source node.Can obtain this parameter difference by following two kinds of modes.
1, the mode of new business source node by Signalling exchange sent the connection request that comprises self transmitter parameter to described destination node, specifically by the mode of distributed connection request.Distributed connection request has referred to and has connected the distribution of foundation and Connection Release and resource and the coordination between release, with this, affected connection.RSVP (Resource ReSerVation Protocol-Traffic Engineering to expand based on traffic engineering in the present embodiment, RSVP-TE) be example, its concrete signaling process is as shown in Figure 3: by distributed signaling RSVP-TE agreement is expanded accordingly, in RSVP-TE ' Path ' message, newly increase object " transmitter parameter " comprising " power parameter " and " phase parameter ", for the physical parameter value to destination node business transferring source node transmitter.Destination node is according to wherein the transmitter parameter of described old service source node and the transmitter parameter of new business source node of record calculate described parameter difference.In RSVP-TE ' Resv ' message, newly increase object " transmitter adjustments parameter ", comprising " power adjustments " and " phase adjusted ", for carrying the parameter of the adjustable device after calculating, regulate value, i.e. parameter difference.Can certainly adopt other distributed signaling mode to realize connection request.
For fear of re-adjustments, preferably, destination node judges after calculating parameter difference whether this parameter difference exceeds predetermined error range, and now, parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values.If exceed this error range, in RSVP-TE ' Resv ' message, newly increase object " transmitter adjustments parameter ", and perform step S202 in new business source node, otherwise in ' Resv ' of loopback message, newly increase object " transmitter adjustments parameter " and be all made as 0, new business source node keeps transmitter raw parameter.
2, in distributed network, take the synchronous mode of the routing iinformation difference that gets parms, as shown in Figure 4.In order to collect and transmit each transmitter parameter information, in the present embodiment, current open type shortest path priority protocol (Open Shortest Path First-Traffic Engineering, the OSPF-TE) Routing Protocol based on traffic engineering expansion is expanded.Each control plane node (Control Plane Entity CPE) builds the physical parameter information database (Physical parameter Information Database PID) of a global network transmitter.Source node regulates local transmitter parameter value according to the PID self adaptation of oneself, then, by RSVP-TE signaling protocol, by signaling, completes the light path process of setting up.After source node and destination node are set up service connection and are completed, by the mapping relations of the transmitter parameter just having upgraded and destination node, (as: the node A of circle, source sent business to destination node B, D, A may have different transmitter parameters with respect to B and D so, so there are the mapping relations of A transmitter parameter-B, A transmitter parameter-D, when source node C sends business to B, the parameter adjustment of self is arrived relative with A unanimously just passable with transmitter parameter B) pass through OSPF-TE mechanism inundation information to upgrade the PID of the whole network node.
The PID of this new business source node inquiry self storage, finds and the transmitter parameter that self has the old service source node of common purpose node, then calculates described parameter difference.
For fear of re-adjustments, preferably, after calculating parameter difference, judge whether this parameter difference exceeds predetermined error range, now, parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values.If exceed this error range, in RSVP-TE ' Resv ' message, newly increase object " transmitter adjustments parameter "; And perform step S202 in new business source node, and otherwise newly increase object " transmitter adjustments parameter " in ' Resv ' of loopback message, be all made as 0, new business source node keeps transmitter raw parameter.
Step S202, new business source node regulates the transmitter parameter of self according to described difference, make the transmitter parameter of self consistent with the transmitter parameter of old service source node.
The transmitter that also comprises new business source node after step S202 is transmitted into destination node by business information by optical-fiber network according to current parameter (if regulated by the parameter after regulating, otherwise by the raw parameter of new business source node transmitter).
The present invention also provides a kind of transmitter self-adaption regulation system, comprise: parameter difference acquisition module, for the new business source node of optical-fiber network, obtain the transmitter parameter difference of itself and old service source node, new business source node and old service source node are the source nodes with common purpose node, and two business are carried out photosphere traffic grooming; Parameter adjustment module, regulates the transmitter parameter of self according to described difference for described new business source node, make the transmitter parameter of self consistent with the transmitter parameter of old service source node.
This parameter difference acquisition module comprises: connection request module, and the mode for new business source node by Signalling exchange is sent the connection request that comprises self transmitter parameter to described destination node; Parameter difference computing module, calculates described parameter difference for destination node according to the transmitter parameter of described old service source node and the transmitter parameter of new business source node that wherein record; Parameter difference is returned to module, and the mode for destination node by described Signalling exchange sends described parameter difference to described new business source node.
Another kind of parameter difference acquisition module comprises: database lookup module, the transmitter parameter database of all nodes of optical-fiber network of self storing for the inquiry of new business source node, finds and the transmitter parameter that self has the old service source node of common purpose node; Parameter difference computing module, for calculating described parameter difference.For this parameter difference acquisition module, this system also comprises: parameter information synchronization module, after connecting for each business of optical-fiber network, the mapping relations of the transmitter parameter of source node and destination node are flooded to other node in optical-fiber network, to upgrade transmitter parameter database wherein.
Above-mentioned two kinds of parameter difference acquisition modules can separately exist in this system, also can be present in this system simultaneously, and difference gets parms in any that parameter adjustment module can be from above-mentioned two parameter difference acquisition modules.
Preferably, this system also comprises:
Self adaptation test and appraisal module, for judging whether described parameter difference exceeds predetermined error range, if now there are a plurality of old service source nodes, described parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values, if exceed described error range, execution parameter adjustment module, otherwise new business source node keeps transmitter raw parameter.
Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes 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 (9)
1. a transmitter adaptive regulation method, is characterized in that, comprises the following steps:
S1: the new business source node in optical-fiber network obtains the transmitter parameter difference of itself and old service source node, and described new business source node and old service source node are the source nodes with common purpose node;
S2: described new business source node regulates the transmitter parameter of self according to described difference, make the transmitter parameter of self consistent with the transmitter parameter of old service source node;
In described step S1, the mode of obtaining described parameter difference comprises step:
The mode of described new business source node by Signalling exchange sent the connection request that comprises self transmitter parameter to described destination node;
Described destination node is according to wherein the transmitter parameter of described old service source node and the transmitter parameter of new business source node of record calculate described parameter difference;
Described destination node sends described parameter difference by the mode of described Signalling exchange to described new business source node.
2. transmitter adaptive regulation method as claimed in claim 1, is characterized in that, in described step S1, the mode of obtaining described parameter difference comprises step:
In the optical-fiber network of described new business source node inquiry self storage, the transmitter parameter database of all nodes, finds and the transmitter parameter that self has the old service source node of common purpose node;
Calculate described parameter difference.
3. transmitter adaptive regulation method as claimed in claim 2, is characterized in that, before described step S1, also comprises:
After each business in described optical-fiber network connects, the mapping relations of the transmitter parameter of source node and destination node are flooded to other node in optical-fiber network, to upgrade transmitter parameter database wherein.
4. the transmitter adaptive regulation method as described in any one in claim 1～3, is characterized in that, in described step S1, after obtaining described parameter difference, also comprises:
Judge whether described parameter difference exceeds predetermined error range, if now there are a plurality of old service source nodes, described parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values, if exceed described error range, perform step S2, otherwise new business source node keeps transmitter raw parameter.
5. transmitter adaptive regulation method as claimed in claim 4, is characterized in that, after described step S2, also comprises:
S3: the transmitter of described new business source node is transmitted into destination node by business information by optical-fiber network according to current parameter.
6. a transmitter self-adaption regulation system, is characterized in that, comprising:
Parameter difference acquisition module, obtains the transmitter parameter difference of itself and old service source node for the new business source node of optical-fiber network, described new business source node and old service source node are the source nodes with common purpose node;
Parameter adjustment module, regulates the transmitter parameter of self according to described difference for described new business source node, make the transmitter parameter of self consistent with the transmitter parameter of old service source node;
Described parameter difference acquisition module specifically comprises:
Connection request module, the mode for described new business source node by Signalling exchange is sent the connection request that comprises self transmitter parameter to described destination node;
Parameter difference computing module, calculates described parameter difference for described destination node according to the transmitter parameter of described old service source node and the transmitter parameter of new business source node that wherein record;
Parameter difference is returned to module, and the mode for described destination node by described Signalling exchange sends described parameter difference to described new business source node.
7. transmitter self-adaption regulation system as claimed in claim 6, is characterized in that, described parameter difference acquisition module comprises:
Database lookup module, the transmitter parameter database of all nodes of optical-fiber network of self storing for described new business source node inquiry, finds and the transmitter parameter that self has the old service source node of common purpose node;
Parameter difference computing module, for calculating described parameter difference.
8. transmitter self-adaption regulation system as claimed in claim 7, is characterized in that, described system also comprises:
Parameter information synchronization module, after connecting, is flooded to other node in optical-fiber network by the mapping relations of the transmitter parameter of source node and destination node, to upgrade transmitter parameter database wherein for each business of described optical-fiber network.
9. the transmitter self-adaption regulation system as described in any one in claim 6～8, is characterized in that, described system also comprises:
Self adaptation test and appraisal module, for judging whether described parameter difference exceeds predetermined error range, if now there are a plurality of old service source nodes, described parameter difference is the difference of new business source node transmitter parameter and a plurality of old service source node transmitter parameter mean values, if exceed described error range, execution parameter adjustment module, otherwise new business source node keeps transmitter raw parameter.
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| 张杰，张华.灵活透明光网络的自适应传输控制策略.《中兴通讯技术》.2008,第14卷(第4期), * |
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