CN107241660B - Switching network architecture and method of all-optical flexible granularity for intelligent power grid service - Google Patents
Switching network architecture and method of all-optical flexible granularity for intelligent power grid service Download PDFInfo
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Abstract
The invention provides a switching network architecture and a method of all-optical flexible granularity for intelligent power grid services, wherein the method has the characteristic of large granularity range for the services in the intelligent power grid, and network resources are independently divided from two dimensions of a time domain and a frequency domain; the method mainly comprises the steps that a high-speed optical switch enabled by a whole-network time synchronization technology is used for carrying out rapid optical path switching in a time domain, flexible spectrum width selection is mainly carried out through a variable bandwidth optical transceiver in a frequency domain, resource division of the two dimensions is independent, and the resource division is carried out under the control of a network central controller; the resources of the time domain and the frequency domain form a two-dimensional resource block in the network, and can be used for adapting to network services; the time/frequency two-dimensional resource allocation method operated in the controller can allocate appropriate network routing and link resources according to the requirements of the intelligent power grid service and the requirements, and the effectiveness of resource allocation is guaranteed.
Description
Technical Field
The invention relates to the technical field of optical network communication, in particular to an all-optical flexible granularity switching network architecture and a resource allocation method for intelligent power grid services.
Background
The time domain switching has the advantage of fine granularity, but the coarse-granularity service scheduling is difficult, and the frequency domain switching has the advantage of coarse granularity.
An all-Optical Circuit Switching (OCS) technology in a frequency domain can only provide wavelength-level large-granularity data exchange, the network bandwidth utilization rate is low, and bandwidth resources can be provided for services with larger bandwidth; the bandwidth-variable optical transceiver enables the frequency spectrum of the frequency domain to be more flexibly used, and the network can flexibly select the occupied bandwidth according to the granularity of the service request.
all-Optical Packet Switching (OPS) technology in the time domain can provide ultra-fine sub-wavelength granularity switching, but it requires the participation of all-optical buffers and all-optical logic devices. These devices are not mature at present and cannot be put into practical use, and their prospects for development are not optimistic in the foreseeable future. The all-Optical Burst Switching (OBS) technology can be regarded as a combination of the OCS technology and the OPS technology, and can overcome the disadvantages thereof to some extent. Through out-of-band signaling, OBSs can implement sub-wavelength granularity switching without optical buffering. However, as with the OPS, the OBS cannot guarantee reliable data transmission due to the existence of packet loss, and particularly under the condition of high traffic load, the packet loss rate of the OBS without a buffer device far exceeds the conventional packet switching technology, which severely limits the application of the OBS technology. The Optical Time Slice Switching (OTSS) improves the above problems, and it utilizes the time synchronization technology, can implement time division multiplexing on one optical channel, and has the advantage of fine granularity, but the service request with large bandwidth can make the frame length of the time period of the OTSS too large, which results in the increase of the polling waiting time delay at the service arrival time, and still cannot adapt to the adaptation problem of the service with super-large granularity.
Disclosure of Invention
In view of this, the present invention provides a switching network architecture and a method for smart grid services with all-optical flexible granularity, so as to solve one of the technical problems in the prior art. The technical scheme is as follows:
an all-optical flexible granularity switching network architecture and a method for intelligent power grid services comprise:
in an optical network architecture, network resources are subjected to resource segmentation and multiplexing in a time domain and a frequency domain by corresponding switching equipment, the resource allocation of the time domain and the resource allocation of the frequency domain are independent, and a two-dimensional time/frequency resource block formed by the network architecture can be used for forming an optical channel and adapting to network services under the scheduling of a time-frequency two-dimensional optimization method.
Preferably, the method further comprises the following steps:
the network architecture needs to operate under a specific network resource allocation method, the method needs to be adapted to the characteristics of network services, and particularly in a smart grid, the resource allocation method needs to be designed according to the size relationship between the service granularity and the minimum time/frequency two-dimensional resource block, the time resource slice and the frequency resource slice.
Preferably, the method further comprises the following steps:
in the network, the resources of the time domain and the frequency domain form a two-dimensional resource block in the network, and can be used for adapting to network services; calculating a two-dimensional network route according to the service request; distributing two-dimensional network resources for the service according to the route, updating a network database, and repeatedly executing the three steps for each service arrival so as to adapt to the network service request in real time; the service oriented to the intelligent power grid has the characteristic of large granularity range, and network resources are independently divided from two dimensions of a time domain and a frequency domain; the method mainly comprises the steps that a high-speed optical switch enabled by a whole-network time synchronization technology is used for carrying out rapid optical path switching in a time domain, flexible spectrum width selection is carried out mainly through a variable bandwidth optical transceiver in a frequency domain, resource division of the two dimensions is independent, and the resource division is carried out under the control of a network central controller.
Preferably, the method further comprises the following steps:
the method comprises the steps that switching equipment of a time domain and a frequency domain is arranged at each node of a smart grid communication network, a high-speed optical switch is arranged in the time domain, an optical path can be accurately switched under the control of a time synchronization system, and a variable bandwidth optical transceiver and a spectrum selection switch are adopted in the frequency domain; a high-precision time synchronization device is arranged at each node, the time synchronization precision at least reaches 10 nanoseconds, and a network controller uniformly controlled by the whole network can accurately calculate and divide network resources.
Preferably, the method further comprises the following steps:
the time domain switching and the frequency domain switching of each node are independent and can be coordinated under the control of a network central controller, the size of a two-dimensional resource block is related to the service request bandwidth, specifically, the size of each resource block is represented by a decimal number between 0 and 1 and represents the proportion of the resource block in the total resource of the dimension, and then, the size of the time/frequency two-dimensional resource block is equal to the product of the size of the frequency domain resource block and the size of the time domain resource block.
Preferably, the method further comprises the following steps:
when the frequency domain is exchanged, the network resource allocation method needs to consider the time slot exchanged by the time domain at the same time, and when the time domain is exchanged, the network resource allocation method also needs to consider the frequency spectrum slot allocated by the frequency domain, which is a two-dimensional joint optimization process, specifically, a time-frequency two-dimensional resource block in the network can be represented as Utf, t represents the time slot serial number of the time domain, and f represents the frequency spectrum slot serial number of the frequency domain, so that the method needs to consider resource continuity limitation, that is, on the same link, the time slot serial numbers allocated to the same service must be continuous, and the frequency spectrum slot serial numbers allocated to the same service must be continuous; on the multi-segment links traversed by the same service, the spectrum slots occupied by different links need to be shifted by the same transmission time relative to the link length, so as to ensure that each segment of service can be continuously transmitted on the multi-segment links.
Preferably, the method further comprises the following steps:
for services with the service request granularity smaller than a time-frequency two-dimensional resource block in the power grid, a two-dimensional resource block can be directly divided on a routing path; for the service request granularity which is larger than the time-frequency two-dimensional resource block but smaller than the time slot or the frequency spectrum slot granularity, a plurality of time-frequency two-dimensional resource blocks can be divided or one time slot or frequency spectrum slot can be directly divided, and the mode of occupying the least network resources can be selected according to the occupied amount of the resources; for the service request granularity larger than the time slot or spectrum slot granularity, a plurality of time slot or spectrum slot granularities can be directly distributed, or a greater number of time-frequency two-dimensional resource blocks can be distributed, and a mode of occupying the least network resources can be specifically selected according to the occupied amount of resources.
Preferably, the method further comprises the following steps:
after the routing and resource allocation calculation is completed, the network controller issues related routing and resource allocation signaling to the related network nodes, a serial route establishment mode is adopted, and when the service establishment is successful, the network controller receives feedback signaling and simultaneously refreshes a network state database.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a switching network architecture and a method of all-optical flexible granularity for intelligent power grid services, the method has the characteristic of large granularity range for services in the intelligent power grid, and network resources are independently divided from two dimensions of a time domain and a frequency domain; the method mainly comprises the steps that a high-speed optical switch enabled by a whole-network time synchronization technology is used for carrying out rapid optical path switching in a time domain, flexible spectrum width selection is mainly carried out through a variable bandwidth optical transceiver in a frequency domain, resource division of the two dimensions is independent, and the resource division is carried out under the control of a network central controller; the resources of the time domain and the frequency domain form a two-dimensional resource block in the network, and can be used for adapting to network services; the time/frequency two-dimensional resource allocation method operated in the controller can allocate appropriate network routing and link resources according to the requirements of the intelligent power grid service and the requirements, and the effectiveness of resource allocation is guaranteed.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a resource allocation method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a time/frequency two-dimensional resource block;
fig. 3 is a schematic diagram of service distribution in a smart grid.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The following describes an all-optical flexible granularity switching network architecture and a method oriented to smart grid services according to an embodiment of the present invention with reference to the accompanying drawings.
In an optical network, network spectrum resources are divided into two-dimensional resource blocks in a time domain and a frequency domain for data transmission; the frequency domain uses a bandwidth variable optical transceiver and a spectrum selection switch, frequency resources can be flexibly allocated, and the time domain uses a high-speed optical switch, and variable-length time slice resources can be flexibly allocated on the basis of time synchronization; the allocation of time resource blocks and frequency resource blocks is independent.
In the network, the resources of the time domain and the frequency domain form a two-dimensional resource block in the network, and can be used for adapting to network services; calculating a two-dimensional network route according to the service request, distributing two-dimensional network resources for the service according to the route, and updating a network database, wherein the three steps are repeatedly executed for each service arrival so as to adapt to the network service request in real time; the service oriented to the intelligent power grid has the characteristic of large granularity range, and network resources are independently divided from two dimensions of a time domain and a frequency domain; the method mainly comprises the steps that a high-speed optical switch enabled by a whole-network time synchronization technology is used for carrying out rapid optical path switching in a time domain, flexible spectrum width selection is carried out mainly through a variable bandwidth optical transceiver in a frequency domain, resource division of the two dimensions is independent, and the resource division is carried out under the control of a network central controller.
The method comprises the steps that switching equipment of a time domain and a frequency domain is arranged at each node of a smart grid communication network, a high-speed optical switch is arranged in the time domain, an optical path can be accurately switched under the control of a time synchronization system, and a variable bandwidth optical transceiver and a spectrum selection switch are adopted in the frequency domain; a high-precision time synchronization device is arranged at each node, the time synchronization precision at least reaches 10 nanoseconds, and a network controller uniformly controlled by the whole network can accurately calculate and divide network resources.
The time domain switching and the frequency domain switching of each node are independent and can be coordinated under the control of a network central controller, the size of a two-dimensional resource block is related to the service request bandwidth, specifically, the size of each resource block is represented by a decimal number between 0 and 1 and represents the proportion of the resource block in the total resource of the dimension, and then, the size of the time/frequency two-dimensional resource block is equal to the product of the size of the frequency domain resource block and the size of the time domain resource block.
When the frequency domain is exchanged, the network resource allocation method needs to consider the time slot exchanged by the time domain at the same time, and when the time domain is exchanged, the network resource allocation method also needs to consider the frequency spectrum slot allocated by the frequency domain, which is a two-dimensional joint optimization process, specifically, a time-frequency two-dimensional resource block in the network can be represented as Utf, t represents the time slot serial number of the time domain, and f represents the frequency spectrum slot serial number of the frequency domain, so that the method needs to consider resource continuity limitation, that is, on the same link, the time slot serial numbers allocated to the same service must be continuous, and the frequency spectrum slot serial numbers allocated to the same service must be continuous; on the multi-segment links traversed by the same service, the spectrum slots occupied by different links need to be shifted by the same transmission time relative to the link length, so as to ensure that each segment of service can be continuously transmitted on the multi-segment links.
For services with the service request granularity smaller than a time-frequency two-dimensional resource block in the power grid, a two-dimensional resource block can be directly divided on a routing path; for the service request granularity which is larger than the time-frequency two-dimensional resource block but smaller than the time slot or the frequency spectrum slot granularity, a plurality of time-frequency two-dimensional resource blocks can be divided or one time slot or frequency spectrum slot can be directly divided, and the mode of occupying the least network resources can be selected according to the occupied amount of the resources; for the service request granularity larger than the time slot or spectrum slot granularity, a plurality of time slot or spectrum slot granularities can be directly distributed, or a greater number of time-frequency two-dimensional resource blocks can be distributed, and a mode of occupying the least network resources can be specifically selected according to the occupied amount of resources.
After the routing and resource allocation calculation is completed, the network controller issues related routing and resource allocation signaling to the related network nodes, a serial route establishment mode is adopted, and when the service establishment is successful, the network controller receives feedback signaling and simultaneously refreshes a network state database.
The framework and the method of the all-optical flexible granularity switching network for the smart grid service are introduced in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. An all-optical flexible granularity switching network architecture and a method for intelligent power grid services are characterized by comprising the following steps:
in an optical network architecture, network resources are subjected to resource segmentation and multiplexing by corresponding switching equipment in a time domain and a frequency domain, the resource allocation of the time domain and the resource allocation of the frequency domain are independent, and a two-dimensional time/frequency resource block formed by the network architecture can be used for forming an optical channel and adapting to network services under the scheduling of a time-frequency two-dimensional optimization method;
the network architecture needs to operate under a specific network resource allocation method, the method needs to be adapted to the characteristics of network services, and in an intelligent power grid, a resource allocation method needs to be designed according to the size relation between service granularity and a minimum time/frequency two-dimensional resource block, a time resource slice and a frequency resource slice;
in the network, the resources of the time domain and the frequency domain form a two-dimensional resource block in the network, and can be used for adapting to network services; calculating a two-dimensional network route according to the service request; distributing two-dimensional network resources for the service according to the route, updating a network database, and repeatedly executing the three steps for each service arrival so as to adapt to the network service request in real time; the service oriented to the intelligent power grid has the characteristic of large granularity range, and network resources are independently divided from two dimensions of a time domain and a frequency domain; the method mainly comprises the steps that a high-speed optical switch enabled by a whole-network time synchronization technology is used for carrying out rapid optical path switching in a time domain, flexible spectrum width selection is mainly carried out through a variable bandwidth optical transceiver in a frequency domain, resource division of the two dimensions is independent, and the resource division is carried out under the control of a network central controller;
the method comprises the steps that switching equipment of a time domain and a frequency domain is arranged at each node of a smart grid communication network, a high-speed optical switch is arranged in the time domain, an optical path can be accurately switched under the control of a time synchronization system, and a variable bandwidth optical transceiver and a spectrum selection switch are adopted in the frequency domain; a high-precision time synchronization device is arranged at each node, the time synchronization precision at least reaches 10 nanoseconds, and a network controller uniformly controlled by the whole network can accurately calculate and divide network resources;
when the frequency domain is exchanged, the network resource allocation method needs to consider the time slot exchanged by the time domain at the same time, and when the time domain is exchanged, the network resource allocation method also needs to consider the frequency spectrum slot allocated by the frequency domain, which is a two-dimensional joint optimization process, wherein a time-frequency two-dimensional resource block in the network is represented as Utf, t represents the time slot serial number of the time domain, and f represents the frequency spectrum slot serial number of the frequency domain, and then the method needs to consider resource continuity limitation, that is, on the same link, the time slot serial numbers allocated to the same service must be continuous, and the frequency spectrum slot serial numbers allocated to the same service must be continuous; on the multi-segment links traversed by the same service, the spectrum slots occupied by different links need to be shifted by the same transmission time relative to the link length, so as to ensure that each segment of service can be continuously transmitted on the multi-segment links.
2. The method of claim 1, further comprising:
the time domain switching and the frequency domain switching of each node are independent and can be coordinated under the control of a network central controller, the size of a two-dimensional resource block is related to the service request bandwidth, the size of each resource block is represented by a decimal number between 0 and 1 and represents the proportion of the resource block in the total dimension, and then the size of the time/frequency two-dimensional resource block is equal to the product of the size of the frequency domain resource block and the size of the time domain resource block.
3. The method of claim 1, further comprising:
for the service with the service request granularity smaller than the time-frequency two-dimensional resource block in the power grid, directly dividing a two-dimensional resource block on a routing path; for the service request granularity which is larger than the time-frequency two-dimensional resource block but smaller than the time slot or the frequency spectrum slot granularity, dividing a plurality of time-frequency two-dimensional resource blocks or directly dividing a time slot or a frequency spectrum slot, and selecting a mode of occupying the least network resources according to the occupied amount of resources; for the service request granularity larger than the time slot or the spectrum slot granularity, directly distributing a plurality of time slot or spectrum slot granularities or distributing a greater number of time-frequency two-dimensional resource blocks, and selecting a mode of occupying the least network resources according to the occupied quantity of resources.
4. The method of claim 3, further comprising:
after the routing and resource allocation calculation is completed, the network controller issues related routing and resource allocation signaling to the related network nodes, a serial route establishment mode is adopted, and when the service establishment is successful, the network controller receives feedback signaling and simultaneously refreshes a network state database.
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| CN103580771A (en) * | 2013-11-11 | 2014-02-12 | 清华大学 | All-optical time slice switching method based on time synchronization |
| US20140308037A1 (en) * | 2013-04-11 | 2014-10-16 | Nec Laboratories America, Inc. | Optical Network Switching Using N:N Transponder Through Time-Domain Multiplexing and Burst Mode Access |
| CN105072513A (en) * | 2015-07-16 | 2015-11-18 | 清华大学 | Optical network control method for supporting multiple transmission exchange modes |
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| US20140308037A1 (en) * | 2013-04-11 | 2014-10-16 | Nec Laboratories America, Inc. | Optical Network Switching Using N:N Transponder Through Time-Domain Multiplexing and Burst Mode Access |
| CN103580771A (en) * | 2013-11-11 | 2014-02-12 | 清华大学 | All-optical time slice switching method based on time synchronization |
| CN105072513A (en) * | 2015-07-16 | 2015-11-18 | 清华大学 | Optical network control method for supporting multiple transmission exchange modes |
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