CN108540211A - A kind of satellite network framework based on SDN Yu ICN technologies - Google Patents
A kind of satellite network framework based on SDN Yu ICN technologies Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0659—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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Abstract
The invention discloses a kind of satellite network framework based on SDN Yu ICN technologies, including：Application layer, control layer, forwarding；The application layer realizes the business such as content caching, name resolution, message routing and safety；Northbound interface between the application layer and control layer realizes the deployment of business；The control layer is layered distribution type, is realized and is communicated by East and West direction interface between internal controller, while each controller provides the programmable functions that open interface realizes application layer to controller；The forwarding, including the low base of the rail, in the satellite node and ground OpenFlow interchangers of OpenFlow, this layer realizes the forwarding of message according to the flow table that control issues.The characteristics of framework turns control separation by SDN improves the speed of network data transmission while simplifying satellite network management using the characteristic of ICN cachings.And the deployment of ICN is allow to accomplish minimal modification procotol and to the greatest extent compatible network infrastructure by this combination.
Description
Technical field
The present invention relates to the communications fields, specifically say it is a kind of satellite network framework based on SDN Yu ICN technologies.
Background technology
SDN is decoupled as a kind of Future network architectures, by the forwarding of network layer data with control, passes through controller
Programmable feature realizes the rapid deployment of new business.ICN replaces " IP " layer using " content ", solid to content by playing network
The features such as some request polymerizations, data broadcasting and caching, to promote the speed of transmitted data on network.But ICN is as a kind of
The future network of clean-state, is directly realized by and is restricted by many factors.
Satellite network framework based on SDN is under the thought of software defined network by data routing, resource in satellite network
The functions such as distribution, network failure and safety monitoring focus on controller, to simplify the management function of satellite network.However
Satellite network design based on SDN is still IP-based conventional network protocols stack, still in face of new big data network environment
The speed of data transmission cannot inherently be promoted.In information centre's network based on SDN, application layer is realized in ICN thoughts
The business such as name resolution, name routing and content caching, the deployment of business is realized by the open interface that control layer provides.But base
It is based primarily upon ground network in information centre's network of SDN, network topology structure is fixed, and existing scheme cannot be applied directly
In satellite network.
Invention content
For Streaming Medias such as videos under traditional Incorporate network-control and service deployment complexity and big data environment
The problems such as request of data delay is big, this application provides a kind of satellite network framework based on SDN Yu ICN technologies
The characteristics of ContentSDSN, which turns control separation by SDN, utilizes ICN cachings while simplifying satellite network management
Characteristic improves the speed of network data transmission.And the deployment of ICN is allow to accomplish minimum limit by this combination
Modification procotol and compatible network infrastructure to the greatest extent.
To achieve the goals above, the technical essential of the present invention program is：A kind of satellite network based on SDN Yu ICN technologies
Network framework, including：Application layer, control layer, forwarding；The application layer realizes content caching, name resolution, message routing and peace
Congruent business；Northbound interface between the application layer and control layer realizes the deployment of business；The control layer is layered distribution type,
It is realized and is communicated by East and West direction interface between its internal controller, while each controller provides open interface and realizes application layer pair
The programmable functions of controller；The forwarding, including the low base of the rail are handed in the satellite node and ground OpenFlow of OpenFlow
It changes planes, this layer realizes the forwarding of message according to the flow table that control issues, while increasing the caching function to returned content.
Further, each controller includes：Network topology management module, routing management module, Content Management mould
Block；The network topology management module, including：Link state monitoring module and network topology management module；The routing management
Module, including：Network flow management monitoring modular, the routing calculation module based on title, forwarding information storehouse FIB management modules and
Pending required list PIT management modules；The content managing module, including content fragment management module, name resolution device and interior
Hold caching management module；Controller is by the escape ways of OpenFlow interchangers, using OpenFlow protocol realizations to forwarding
The control of equipment.
Further, this framework identifies that ICN is asked by the way of covering IP agreement, with the areas IF (ICN-Flag) Zhi Lai
Divide request type；ICN is asked, content name information is carried using the Options fields of IP agreement.
Further, in this framework, the controller of ground network uses layered distribution type control mode, according to region spy
Point is divided into several autonomous areas (AS), and each autonomous area is by a name route system (Name Routing
System, NRS) controller management, pass through northbound interface exchange network status information between controller.
Further, the satellite network in the framework is designed using double-layer track, wherein 3 synchronous satellites are as controller
Realize that whole world monitoring in real time, low rail realize Global coverage using Walker constellations.
Further, when ICN clients are initiated to ask, judged whether according to request content status information in controller
It needs to forward content by satellite network, to track the repeating process of request by ground or high rail controller；When interior
When holding return, the OpenFlow nodes on return path are according to cache replacement policy come cache contents.
Further, entire satellite period is divided into several timeslices；Satellite controller is periodically detected
Satellite network topology variation situation；To predict in advance whether the path for needing change data to transmit, data packet then ensure that
It will not be interrupted because of the dynamic of satellite network when return.
Further, when on data return path a certain satellite node break down cause data outage when, directly
To controller reporting error message after ACK time-out, controller regenerates data return path and avoids forerunner's satellite node
Malfunctioning node.
Advantageous effect is the present invention compared with prior art：On the one hand the application simplifies Incorporate using SDN frames
Change the efficiency that network-based control improves network service deployment simultaneously；On the other hand poly- using the intrinsic request of forward node in network
Close has hypersensitivity and alternative the characteristics of caching with the ability of data distribution and the internal container of forward node, to real
The promotion of existing Incorporate overall performance of network.Simulation result shows the traditional Incorporate of ContentSDSN frameworks comparison
The network architecture has many advantages, such as that network-control is flexible and request delay is small.
Description of the drawings
Fig. 1 is ContentSDSN framework building-block of logic；
Fig. 2 is ContentSDSN controller core mechanocardiographies；
Fig. 3 is modified IP agreement figure；
Fig. 4 is the routing flow chart under ContentSDSN frameworks；
Fig. 5 is ContentSDSN framework prototype figures；
Fig. 6 is 3 dimensional views of satellite network constellation；
Fig. 7 is 2 dimensional views of satellite network constellation；
Fig. 8 is the relational graph of request delay and request number of times under ContentSDSN frameworks；
Fig. 9 is the relational graph that average number of hops and nodal cache capacity are asked under ContentSDSN frameworks.
Specific implementation mode
Below in conjunction with Figure of description, the invention will be further described.Following embodiment is only used for clearly
Illustrate technical scheme of the present invention, and not intended to limit the protection scope of the present invention.
ContentSDSN frameworks proposed by the invention are under the SDN system frameworks based on OpenFlow communication protocols
Logical construction such as Fig. 1.The industry such as content caching, name resolution, message routing and safety in ICN thoughts are realized in application layer exploitation
The northbound interface of business, business being deployed through between application layer and control layer is realized.
In this framework, control layer is the core layer in three-tier architecture, is realized using layered distribution type mode, between controller
It is realized and is communicated by East and West direction interface, while application layer provides open interface to the programmable functions of controller by each controller
It realizes.
The wherein realization of single controller such as Fig. 2, routing management module increase routing module based on content name and
The management business of the forwarding information storehouse of content requests and pending required list；Meanwhile controller increases content managing module, mainly
Name resolution, the services such as content fragment and content caching management are provided.
ContentSDSN frameworks are compatible with network infrastructure to realize, need to identify traditional IP requests
It is asked with ICN.The framework identifies that ICN is asked by the way of covering IP agreement, i.e., comes area using the reserved place in IP agreement
Traditional IP requests are divided to be asked with ICN.
ContentSDSN frameworks distinguish request type, such as Fig. 3 with IF (ICN-Flag) values, i.e. ICN clients are being initiated
By the positions IF be 1 rather than ICN clients by the positions IF it is 0 when sending request when content requests.ICN is asked, IP is used
The Options fields of agreement carry content name information, i.e., content name mapped cryptographic Hash group are written to Options words
Duan Zhong.When OpenFlow interchangers identify for ICN message when, header is uploaded to controller and parses IP packet
Options fields obtain the name of requested content, and controller generates the transmission road of request according to the content name parsed
Diameter simultaneously issues flow table to OpenFlow forwarding units.And for the data of return, the mode of normal IP packets may be used, i.e., will
ICN data are placed on the data segment of IP packets.
The forwarding being finally made of in the satellite node of OpenFlow and ground OpenFlow interchangers etc. the low base of the rail, it is main
The forwarding of message is realized according to the flow table that controller issues, while forwarding equipment carries out caching replacement to returned content.I.e.
As shown in figure 4, specific repeating process is as follows：
Step1：ICN controllers initiate request, judge whether to need to pass through according to request content status information in controller
Satellite network forwards content, does not need such as, executes Step2, otherwise executes Step7.
Step2：Judge the request for whether having content A in AS, if any mistake, boundary node is according in OpenFlow interchangers
Flow table matching forward-path after be transmitted to router, router forwards a request to cache server again, and cache server will
The data of the content be packaged after along request path return to user.Otherwise Step3 is executed.
Step3：Request message head is transmitted to self-operated controller by boundary node, and the controller is from Options field solutions
Content name is precipitated and searches PIT.If the PIT of the controller has recorded the forward-path of request, add to corresponding PIT entities
Add the request to enter the port numbers of network and abandons the grouping.Ending request forwards and pending datas is waited to return.Otherwise it executes
Step4。
Step4：Self-operated controller inquires FIB, if there are the records of content in FIB, generates one about request
Forward-path, execute forwarding behavior simultaneously wait pending datas to return.Otherwise Step5 is executed.
Step5：Self-operated controller initiates path query request, top level control device by East and West direction interface to upper layer controller
Other controllers of layer where to self-operated controller actively issue the path query request of request I.If same layer controller has request I
Path record, then upload to after top level control device and the path be transmitted to self-operated controller by top level control device, directly control
After the fullpath of device generation request I forwarding flow table, while top level control device are issued to the OpenFlow interchangers controlled
Issue the forwarding flow table of request I.Last self-operated controller adds the record of content A into its PIT and FIB.Execute forwarding behavior
And pending datas is waited to return.Otherwise Step6 is executed.
Step6：If a rational forward-path can not be obtained without the caching of content A in the domains AS, then using biography
The routing mode of system IP generates a request path and the request, last self-operated controller is forwarded to add content A into PIT and FIB
Entity, execute forwarding behavior simultaneously wait pending datas to return.After asking to hit, data are returned along original route, and each node executes
Cache replacement policy.For the ICN requests using Traditional IP routing, each controller update FIB records when returning.Routing knot
Beam.
Step7：I headers will be asked to be uploaded to its corresponding high rail controller into ingress, the controller from
Options fields parse content name and search pending required list PIT.If had recorded in the PIT tables of high rail controller
I is asked, then adding the request to corresponding PIT entities enters the interface of network and abandon the grouping.Ending request is forwarded and is jumped
Go to Step10.Otherwise Step8 is executed.
Step8：High rail controller inquires forwarding information storehouse FIB, if there are the record of content A, bases in FIB
The relevant informations such as the record of FIB and low rail network topology generate a forward-path about request I, and are issued to corresponding low
Rail forward node, while the record and associated port number of content A are added into its PIT, it executes forwarding behavior and simultaneously jumps to
Step10.Otherwise Step9 is executed.
Step9：High rail controller maps out its dummy node according to the source of request I, target ip address, using traditional IP
Routing mode generate one acquiescence forward-path and be issued to low orbit satellite forward node, and issue forwarding flow table and to
The entity of content A is added in PIT and FIB.Low rail node executes Step10 after executing forwarding behavior.
Step10：After asking to hit, data are returned according to the path that controller generates, and controller is cached using centralization
Replacement policy selection caches the satellite node of the content and deletes corresponding PIT entities after the completion of data return, and routing terminates.
And when the return of the big datas such as video flowing, it is responsible for the satellite node of communication since the periodicity of operating may fly out virtually
Node region and lead to data-transmission interruptions.Therefore, satellite controller is all by whole service according to the cycle of operation of satellite constellation
Phase is divided into several timeslices.Satellite controller gives birth to situation of change by periodically detecting satellite network topology, to carry
Before predict whether to need the path that change data is transmitted, then ensure that will not be because of the dynamic of satellite network when data packet returns
And it interrupts.When on data return path a certain satellite node break down cause data outage when, direct precursor satellite node
To controller reporting error message after ACK time-out, controller regenerates data return path and avoids malfunctioning node.
On the whole, as shown in figure 5, ContentSDSN frameworks introduce four important function moulds in ICN thoughts
Block：Name resolution, content caching, name routing and network security.Application layer can flexibly realize difference by software programming
ICN business exploitation and be deployed in ContentSDSN controllers by northbound interface.Exchange based on OpenFlow agreements
Machine introduces content caching function in the function of the traditional flow table management of configuration and data exchange.
Below again with the effect of a case verification present invention.
ContentSDSN framework Satellite network environments realize that LEO forwarding uses 20/4/1 by STK emulation platforms
Walker constellations, GEO layers use control layer of 3 synchronous satellites as satellite network.Herein by STK10 to satellite network
It is emulated, the constellation 3-D view and two dimension view of foundation are respectively such as Fig. 6 and Fig. 7.Ground network uses 2 AS, each
There are 5-10 OpenFlow interchanger, each AS to be directly controlled by a controller in AS, the controller of two AS passes through thereon
Layer controller realizes network information interaction.
In simulation process, the size of data block is 10KB, for the content number of request is 100 in network.Simulating, verifying master
Compare the speed that request responds under traditional Internet network framework and satellite framework and the ContentSDSN frameworks proposed
Degree, the relationship for the average number of hops which passes through with request.In design of Simulation, using two ICN visitors
ICN requests are initiated at family end at random, the request grouping that each ICN clients are initiated obey λ=100/second Poisson distribution, each
The requested probability of content obeys Zipf distributions.
The requested probability of content that popularity is k is：
Request pass through average number of hops be：
Wherein k is the ranking that content presses popularity, and α is parameter, and θ is constant；hi(t) it is to ask i from ICN client to quilt
Cache node hits passed through hop count, and N is total number of request in the t times.
The relationship of request delay and request number of times under ContentSDSN frameworks can be obtained after emulation, as shown in Figure 8；Request is flat
The relationship of equal hop count and nodal cache capacity, as shown in Figure 9.
It can to sum up obtain：
1. the present invention is by alloing forward node more easily to identify ICN requests and Traditional IP the modification of IP frames
Request.
2. the present invention had both solved the big bottleneck problem of response delay, also letter in end-to-end transmission mode under big data environment
Change network-based control, improves the flexibility of service deployment.
3. the present invention can effectively shorten terminal initiation request response time, no matter pass through ground network or satellite network
Network can quick obtaining response.
The preferable specific implementation mode of the above, only the invention, but the protection domain of the invention is not
It is confined to this, any one skilled in the art is in the technical scope that the invention discloses, according to the present invention
The technical solution of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection domain it
It is interior.
Claims (8)
1. a kind of satellite network framework based on SDN Yu ICN technologies, which is characterized in that including：Application layer, control layer, forwarding
Layer；The application layer realizes the business such as content caching, name resolution, message routing and safety；Between the application layer and control layer
Northbound interface realize business deployment；The control layer is layered distribution type, is connect by East and West direction between internal controller
Cause for gossip now communicates, while each controller provides the programmable functions that open interface realizes application layer to controller；The forwarding
Layer, including the low base of the rail is in the satellite node and ground OpenFlow interchangers of OpenFlow, the flow table that this layer is issued according to control
It realizes the forwarding of message, while increasing the caching function to returned content.
2. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that each control
Device includes：Network topology management module, routing management module, content managing module；The network topology management module, packet
It includes：Link state monitoring module and network topology management module；The routing management module, including：Network flow management monitors
Module, the routing calculation module based on title, forwarding information storehouse FIB management modules and pending required list PIT management modules；Institute
State content managing module, including content fragment management module, name resolution device and content caching management module；Controller passes through
The escape way of OpenFlow interchangers, the control using OpenFlow protocol realizations to forwarding unit.
3. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that this framework is adopted
It identifies that ICN is asked with the mode of covering IP agreement, request type is distinguished with IF values；ICN is asked, IP agreement is used
Options fields carry content name information.
4. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that in this framework
In, the controller of ground network uses layered distribution type control mode, is divided into several autonomous areas according to regional characteristics, often
A autonomous area passes through northbound interface exchange network state by a name route system controller management, between controller and believes
Breath.
5. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that in the framework
Satellite network designed using double-layer track, wherein 3 synchronous satellites realize whole world monitoring in real time, the use of low rail as controller
Walker constellations realize Global coverage.
6. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that as ICN visitors
When request is initiated at family end, judge whether to need to forward content by satellite network according to request content status information in controller,
To track the repeating process of request by ground or high rail controller；When the content is returned, on return path
OpenFlow nodes are according to cache replacement policy come cache contents.
7. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that will entirely defend
The star cycle of operation is divided into several timeslices；Satellite controller is periodically detected satellite network topology variation situation.
8. a kind of satellite network framework based on SDN Yu ICN technologies according to claim 1, which is characterized in that when data are returned
A certain satellite node breaks down on the diameter of circuit when causing data outage, and direct precursor satellite node is after ACK time-out to control
Device processed reports that error message, controller regenerate data return path and avoid malfunctioning node.
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