CN106028372A - Software defined network (SDN)-based system integrating heterogeneous wireless network - Google Patents

Software defined network (SDN)-based system integrating heterogeneous wireless network Download PDF

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CN106028372A
CN106028372A CN201610292282.6A CN201610292282A CN106028372A CN 106028372 A CN106028372 A CN 106028372A CN 201610292282 A CN201610292282 A CN 201610292282A CN 106028372 A CN106028372 A CN 106028372A
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wireless
network
sub network
wireless terminal
sdn
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CN106028372B (en
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韩涛
姜海奇
葛晓虎
张靖
***
韩宇杰
熊思清
刘雄
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Huazhong University of Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a software defined network (SDN)-based system integrating a heterogeneous wireless network. The system includes a wireless terminal, an SDN controller and a heterogeneous wireless network consisting of N different types of wireless sub-networks. The SDN controller includes a receive module, a processing module and a transmit module. The SDN controller selects an optimal wireless sub-network for accessing for the wireless terminal according to connection request information and network state information respectively received from the wireless terminal and the heterogeneous wireless network by the receive module. When the optimal wireless sub-network is selected for the wireless terminal, the SDN controller considers both an access request type of the wireless terminal and network state information of each wireless sub-network, and introduces relevant channel feature parameters due to consideration of unreliability of a wireless channel, so that overall distribution of the wireless network resource allocation is taken into account, thereby the overall performance of the wireless communication network is optimized.

Description

A kind of system merging heterogeneous wireless network based on SDN
Technical field
The present invention relates to heterogeneous wireless network, especially relate to a kind of system merging heterogeneous wireless network based on SDN.
Background technology
Along with the fast development of wireless communication technology and becoming increasingly abundant of wireless terminal application, especially 5G's is the most emerging Rising, wireless communication field is faced with the surge moving data volume.It practice, by smart mobile phone, panel computer, palm PC with And data volume produced by various types of mobile computing device will continue about 10 years with the trend doubled every year.Cause This, simplify the framework of cordless communication network and incorporate the inexorable trend that new technology is research and development.
Software defined network (Software Defined Network, SDN) is framework and the fusion of cordless communication network Provide new approaches.SDN is a kind of novel transmission via net knot that Clean Slate seminar of Stanford Univ USA proposes Structure, its core architecture is through separating data Layer and the key-course of network, control function is detached from data Layer Out, by SDN controller network it is controlled and optimizes, providing good platform for core network and application.
SDN controller is connected with application layer by northbound interface, is connected with each WAP by southbound interface.Logical Cross open northbound interface researcher can according to different situations and require to write out different application, such as load balancing should With；The status information of network and the demand information of user can be grasped by southbound interface SDN controller, thus preferably for using Family distribution Internet resources.
Although SDN technology is the most sufficiently developed in cable network, but SDN technology answering in terms of radio communication With research seldom.The SDN technology that major part is ripe can be grafted directly to wireless communication field from cable network, but by The problems such as the unreliability in radio communication channel, the application in terms of radio communication of the SDN technology there is also more obstacle, needs Consider that radio communication channel characteristic is on SDN controller and the impact of SDN framework.
Summary of the invention
It is an object of the invention to provide a kind of system merging heterogeneous wireless network based on SDN, for more reasonably dividing Join wireless network resource, to realize the global optimization of wireless network performance.
Technical scheme is as follows: a kind of system merging heterogeneous wireless network based on SDN, it is characterised in that: institute The system of stating includes wireless terminal, SDN controller and the heterogeneous wireless network being made up of N number of different types of wireless sub network, wherein, Described SDN controller includes receiver module, processing module and sending module, and the method for work of described system is as follows:
Step one, wireless terminal accesses the request of heterogeneous wireless network according to required application to the initiation of SDN controller, and Reception power by access request information with for each wireless sub network is sent to SDN controller, described access request information bag Include the access request type required by wireless terminal；
Step 2, the receiver module of SDN controller receives the access request information from wireless terminal and wireless terminal pin Each wireless sub network is received power and the network state information from heterogeneous wireless network, and described access request is believed Breath, wireless terminal are sent to described processing module for reception power and the described network state information of each wireless sub network, Described network state information includes channel width and the load capacity of each wireless sub network；
Step 3, the processing module of SDN controller is receiving access request information, wireless terminal for each wireless son After the reception power of net and network state information, using Discrete Stochastic optimized algorithm is that wireless terminal selects optimal wireless network Network, concrete grammar is as follows:
E. objective function:
Q ( h k , l k , u ) = h k log 2 ( 1 + γ k ) l k ( u = 0 ) h k log 2 ( 1 + γ k ) ( u = 1 )
Wherein, hkRepresent the channel width of kth wireless sub network, lkRepresent the load capacity of kth wireless sub network, u=0 table Being shown as video access request, u=1 is expressed as audio access request, γkRepresent between wireless terminal and kth wireless sub network Signal to Interference plus Noise Ratio, wherein,PkRepresent the wireless terminal reception power for kth wireless sub network, σ2The white Gaussian noise variance yields of the wireless channel between expression SDN controller and heterogeneous wireless network, N represents heterogeneous wireless net The number of wireless sub network in network；
F. in order to make data more accurately and reliably, calculate T target function value respectively for each wireless network and take Averagely obtaining the object function assembly average of each wireless sub network, method is as follows:
Q ^ ( h k , l k , u ) = 1 T Σ t = 1 T Q ( h k t , l k t , u )
Wherein,Represent the t sampling value of the channel width of kth wireless sub network,Represent kth wireless sub network The t sampling value of load capacity；
G. the object function assembly average value of each wireless sub network is calculatedI.e. calculate Q ^ ( h 1 , l 1 u ) ... Q ^ ( h N - 1 , l N - 1 , u ) ;
The most rightBe ranked up, according to object function assembly average from Big is that wireless sub network is ranked up to little order, obtains wireless sub network sequence list, and selects object function assembly averageMaximum wireless sub network is as optimal wireless subnet；
Optimal wireless subnet information and wireless sub network sequence list are sent to SDN controller by the processing module of SDN controller Sending module；
Step 4, the sending module of SDN controller is receiving optimal wireless subnet information and the nothing that processing module sends After line subnet sequence list, pilot signal transmitted to wireless terminal in case wireless terminal access selected by optimal wireless subnet.
Further, the sending module pilot signal transmitted of SDN controller is to wireless terminal so that wireless terminal accesses institute The optimal wireless subnet selected method particularly includes: the sending module of SDN controller to selected optimal wireless subnet pair The Wireless Communication Equipment answered sends connection request signal, if Wireless Communication Equipment corresponding to this wireless sub network is responded agrees to the company of foundation The answer signal connect, then wireless terminal is set up with selected optimal wireless subnet and is connected；If optimal wireless subnet is corresponding Wireless Communication Equipment refusal is set up and is connected, then this optimal wireless subnet abandoned by SDN controller, and suitable from wireless sub network sequence list Sequence ground selects wireless sub network request to set up connection, until obtaining agreeing to set up the answer signal connected；If it is the most wireless Subnet agrees to set up connection, then wireless terminal is forced to access optimal wireless subnet by SDN controller.
Further, heterogeneous wireless network the most periodically sends network state information to SDN controller.
Further, the processing module of described SDN controller includes wireless network virtualization modules, described wireless network Access request information that virtualization modules sends according to wireless terminal, for the reception power of each wireless sub network and network-like State information by virtual for heterogeneous wireless network several virtual radio subnets that turns to, each virtual radio subnet by several nodes and Link forms, and wherein node represents that wireless network access point, link represent wireless channel, is nothing according to Discrete Stochastic optimized algorithm Line terminal selects optimal virtual wireless network to be used for accessing.
The system of the present invention uses SDN controller to be that wireless terminal selects optimal wireless sub network from heterogeneous wireless network For accessing.When selecting optimal wireless subnet for wireless terminal, SDN controller not only allows for the required of wireless terminal The network state of access bandwidth and each wireless sub network includes channel width and load capacity, and in view of wireless channel can not Introducing relevant characteristic of channel parameter, the so wireless sub network selected by wireless terminal by property is to substantially envisage respectively Select in the case of individual factor so that consider the distribution of entirety when carrying out wireless network resource distribution, it is achieved thereby that nothing The overall performance optimization of line communication network.Meanwhile, it is the wireless sub network that wireless terminal selects that user accesses by SDN controller, Achieve by different types of wireless network convergence together, not only optimize overall performance of network, and carry for wireless network Supply higher signal coverage rate, improve user satisfaction simultaneously.
Accompanying drawing explanation
Fig. 1 is the system structure schematic diagram merging heterogeneous wireless network based on SDN.
Fig. 2 is the structural representation of SDN controller.
Fig. 3 is the Discrete Stochastic optimized algorithm flow chart in the present invention.
Fig. 4 is the simulation result schematic diagram of a specific embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention Embodiment be described in detail.It should be noted that in the case of not conflicting, in embodiment in the application and embodiment Feature can mutual combination in any.
Fig. 1 is the system architecture schematic diagram of the present invention.As shown in fig. 1, the system architecture of the present invention include wireless terminal, SDN controller and three parts of heterogeneous wireless network.Heterogeneous wireless network can include Cellular Networks, WiFi, via node etc..Different Each wireless sub network in structure wireless network can be all that the user of wireless terminal provides Connection Service, but wireless terminal connects Can obtain different Consumer's Experience to different wireless sub networks, the integrality of simultaneity factor also can be different, such as heterogeneous wireless Load in each base station equipment in network.Communication between SDN controller and heterogeneous wireless network uses OpenFlow Agreement.OpenFlow consensus standard is the most complete in cable network, therefore the OpenFlow consensus standard in wired network Can be grafted directly in the framework of the present invention.Except macro base station is equipped with an OpenFlow switch with at any time to SDN control Outside device feedback network status information, in heterogeneous wireless network, remaining access point or micro-base station etc. are configured without OpenFlow Switch, they send information by wireless channel to SDN controller.
Fig. 2 is the structural representation of SDN controller, and wherein SDN controller includes receiver module 21, processing module 22 and sends out Send module 23.Receiver module 21 receive wireless terminal user when initiating radio connection request the access request information that sent and For the reception power of each wireless sub network, access request information can include access request type, wireless terminal position etc..Connect Receive module 21 and also receive the network state information of each wireless sub network actively periodically fed back by heterogeneous wireless network, including every The channel width of individual wireless sub network and load capacity.Receiver module 21 is by received access request information, for each wireless The reception power of subnet and network state information are sent to processing module 22, processing module 22 according to these information use discrete with Machine optimized algorithm is that wireless terminal selects optimal wireless sub network for accessing.The optimal wireless subnet that sending module 23 will be selected It is sent to wireless terminal so that wireless terminal accesses by pilot signal.
Fig. 3 is the flow chart of the Discrete Stochastic optimized algorithm in the present invention.In Discrete Stochastic optimized algorithm, first define One object function, is defined as object function in one embodiment:
Q ( h k , l k , u ) = h k log 2 ( 1 + γ k ) l k ( u = 0 ) h k log 2 ( 1 + γ k ) ( u = 1 )
Wherein, hkRepresent the channel width of kth wireless sub network, lkRepresent the load capacity of kth wireless sub network, u=0 table Being shown as video access request, u=1 is expressed as audio access request, γkRepresent between wireless terminal and kth wireless sub network Signal to Interference plus Noise Ratio；Secondly, the assembly average of this object function is defined, as calculated T target respectively for each wireless network Functional value is also averaged the object function assembly average obtaining each wireless sub network so that:
Q ^ ( h k , l k , u ) = 1 T Σ t = 1 T Q ( h k t , l k t , u )
Wherein,Represent the t sampling value of the channel width of kth wireless sub network,Represent kth wireless sub network The t sampling value of load capacity；Finally, its object function assembly average, then object function system are calculated for each wireless sub network The wireless sub network of meter meansigma methods maximum is optimal wireless subnet.
For the process of above-mentioned selection optimal wireless subnet is described below in greater detail, enumerates now one and be embodied as Example.In this specific embodiment, heterogeneous wireless network includes three wireless sub networks, with model { w1,w2,w3Represent respectively this three Individual wireless sub network, each wireless sub network includes a number of base station or relay point, there is also certain within the system simultaneously The wireless terminal of quantity.In order to initiate the wireless terminal of access request, to choose the process that optimal wireless subnet carries out accessing as follows:
1) wireless terminal sends access request to SDN controller, and this solicited message includes access style information, such as wireless end End requires performance number P of each wireless sub network arrived for video access (corresponding parameter is u) and wireless terminal reception1,P2,P3；
2) all timings of the base station in heterogeneous wireless net or via node are by the wireless channel reception mould to SDN controller Block feeds back load state information and the channel condition information of its correspondence, and due to characteristics such as the time delay of wireless channel, declines, SDN is controlled The status information that device processed obtains is inaccurate, here the error that status information is caused by wireless channel is equivalent to additive Gaussian White noise σ2, the network state information of acquisition and access request information can be sent to the process of SDN controller by SDN receiver module Module；
3) processing module of SDN controller is obtaining status information { h1 t,h2 t,h3 tAnd { l1 t,l2 t,l3 tAnd access please Seek performance number P of information u and each wireless sub network1,P2,P3Under conditions of, run Discrete Stochastic optimized algorithm and choose optimal Wireless sub network.
This specifically comprises the following steps that
First, wireless sub network w is arbitrarily chosen1, calculate the object function assembly average that this wireless sub network is corresponding:
Q ^ ( h 1 , l 1 , u ) = 1 T Σ t = 1 T Q ( h 1 t , l 1 t , u ) = 1 T Σ t = 1 T h 1 t log 2 ( 1 + γ 1 ) l 1 t = 1 T Σ t = 1 T h 1 t log 2 ( 1 + P 1 σ 2 + Σ i = 1 , i ≠ 1 3 P i ) l 1 t
Secondly, same computational methods are used to incite somebody to actionWithCalculate；
Again, rightWithBeing ranked up, the object function statistics obtaining maximum is flat Average, the optimal wireless subnet that wireless sub network is this application request that this maximum is corresponding；
Finally, the wireless sub network information chosen and wireless sub network sequence list are sent to the sending module of SDN controller.
4) sending module of SDN controller is after receiving the information that processing module transmits, and pilot signal transmitted is to wireless Terminal so as wireless terminal access selected by optimal wireless subnet.In this process, the sending module of SDN controller to institute The Wireless Communication Equipment that the optimal wireless subnet of selection is corresponding sends connection request signal, if the wireless network that this wireless sub network is corresponding Network equipment is responded and is agreed to set up the answer signal connected, then wireless terminal is set up with selected optimal wireless subnet and is connected, and one Secondary new communication process starts；If the Wireless Communication Equipment refusal that optimal wireless subnet is corresponding is set up connect, then SDN controller Abandon this optimal wireless subnet, and from wireless sub network sequence list, be sequentially selected wireless sub network request foundation connection, until To agreeing to set up the answer signal of connection.If finally not having wireless sub network to agree to set up connection, then SDN controller is by wireless end End is forced to access the wireless sub network that object function assembly average is maximum.
Fig. 4 is present invention MATLAB analogous diagram under conditions of specific embodiment.Analogous diagram is assumed wireless channel pair The error that status information causes is equivalent to additive white Gaussian noise, wherein channel additive white Gaussian noise σ2=20dB, { P1,P2, P3}={ 46,35,20}dBm, the time sampling number of times of selection is T=1000, and uses user satisfaction to make in this emulation For evaluation index.It can be seen that this algorithm can remove the impact that wireless channel noise brings well, and do not make an uproar Simulation result in the case of sound is closely similar, it addition, the radio switch-in method that native system framework proposes can improve well User satisfaction, is dried the access criterion than (SINR) value compared to traditional according to letter, and user satisfaction has had significantly Improve.
It addition, network function virtualization (Network Function Virtual, NFV) is to overcome current internet to develop With the effective way of innovation " ossifing ", and constantly obtain the support of new technique, new opplication, attract increasing concern. Network virtualization is reasonable shields implementing of the underlying basis network equipment, builds virtual network environment above, Virtual resource pool is provided, according to business and demand customized network framework and procotol and in real time, dynamically for SDN controller Call and regulate bottom-layer network resource.The virtualized core concept of network function is exactly to build to take out institute from physical network Need Internet resources, build on this basis corresponding virtual network to meet various variation application needs, then need Virtual network mapping techniques to be used, a complete virtual network (including dummy node and virtual link) is mapped by this technology Process on the infrastructure network of bottom.Base station during wherein virtual wireless network node is mapped to the base foundation network facilities On node, virtual link is mapped on the physical link of bottom heterogeneous wireless net, and base foundation network equipment resource is satisfied by Mobile terminal is to node and the demand of link.SDN controller in the present invention can also include wireless network virtualization modules.Nothing Access request information that gauze network virtualization modules sends according to wireless terminal, for each wireless sub network reception power and N number of wireless sub network of bottom is virtualized into M virtual radio subnet by network state information, and these virtual radio subnets are by node Representing with link, if simplest virtual radio subnet is two nodes and a link, wherein, node represents that wireless network connects Access point or base station, link represents wireless channel.SDN controller utilizes Discrete Stochastic optimized algorithm to choose optimal virtual radio Subnet accesses for wireless terminal.
Become it should be noted that above-described embodiment limits the present invention, all employing equivalents or equivalence the most in any form The technical scheme that the mode changed is obtained, all falls within protection scope of the present invention.

Claims (4)

1. the system merging heterogeneous wireless network based on SDN, it is characterised in that: described system includes that wireless terminal, SDN are controlled Device processed and the heterogeneous wireless network being made up of several different types of wireless sub networks, wherein, described SDN controller includes receiving Module, processing module and sending module, the method for work of described system is as follows:
The most described wireless terminal initiates to access asking of described heterogeneous wireless network to described SDN controller according to the application run Ask, and access request information and described wireless terminal are sent to described SDN for the reception power of each wireless sub network control Device, described access request information includes access request type；
The most described receiver module receives from the described access request information of described wireless terminal and described wireless terminal for often The reception power of individual wireless sub network and the network state information from described heterogeneous wireless network, and described access request is believed Breath, described wireless terminal are sent to described process mould for reception power and the described network state information of each wireless sub network Block, described network state information includes channel width and the load capacity of each wireless sub network；
The most described processing module is receiving described access request information, described wireless terminal for the reception of each wireless sub network After power and described network state information, using Discrete Stochastic optimized algorithm is that described wireless terminal selects optimal wireless network For accessing, concrete grammar is as follows:
A. objective function:
Q ( h k , l k , u ) = h k log 2 ( 1 + γ k ) l k ( u = 0 ) h k log 2 ( 1 + γ k ) ( u = 1 )
Wherein, hkRepresent the channel width of kth wireless sub network, lkRepresenting the load capacity of kth wireless sub network, u=0 is expressed as Video access request, u=1 is expressed as audio access request, γkRepresent between described wireless terminal and kth wireless sub network Signal to Interference plus Noise Ratio, wherein,PkRepresent the reception for kth wireless sub network of the described wireless terminal Power, σ2Represent the white Gaussian noise variance yields of wireless channel between described SDN controller and described heterogeneous wireless network, N Represent the number of wireless sub network in described heterogeneous wireless network；
B. calculate T target function value respectively for each wireless sub network and be averaged, to obtain the mesh of each wireless sub network Scalar functions assembly average, method is as follows:
Q ^ ( h k , l k , u ) = 1 T Σ i = 1 T Q ( h k t , l k t , u )
Wherein,Represent the t sampling value of the channel width of kth wireless sub network,Represent the load of kth wireless sub network The t sampling value of amount；
C. the object function assembly average value of each wireless sub network is calculatedI.e. calculate
The most rightBe ranked up, according to object function assembly average from greatly to Little order is that wireless sub network is ranked up, and obtains wireless sub network sequence list, and selects object function assembly averageMaximum wireless sub network is as optimal wireless subnet；
Described optimal wireless subnet information and described wireless sub network sequence list are sent to described sending module by described processing module；
D., after receiving the described optimal wireless subnet information that described processing module sends, described sending module sends pilot tone Signal to described wireless terminal in case described wireless terminal access selected by optimal wireless subnet.
The most according to claim 1 based on SDN merge heterogeneous wireless network system, it is characterised in that: described isomery without Gauze network the most periodically sends described network state information to described SDN controller.
The system merging heterogeneous wireless network based on SDN the most according to claim 1, it is characterised in that: described SDN controls Device includes wireless network virtualization modules, and described wireless network virtualization modules is according to described access request information, for each Described reception power and the described network state information of wireless sub network turn to several void by virtual for described heterogeneous wireless network Intend wireless sub network, be that described wireless terminal selects best visual wireless network to be used for connecing according to described Discrete Stochastic optimized algorithm Enter.
The system merging heterogeneous wireless network in SDN the most according to claim 1, it is characterised in that: described sending module Pilot signal transmitted to described wireless terminal in case described wireless terminal access selected by the concrete grammar of optimal wireless subnet For: described sending module sends connection request signal to the Wireless Communication Equipment corresponding with selected optimal wireless subnet, if Described Wireless Communication Equipment response agrees to set up the answer signal connected, then wireless terminal is set up even with described optimal wireless subnet Connect；If described Wireless Communication Equipment response refusal set up connect answer signal, the most described SDN controller abandon described most preferably Wireless sub network, and be sequentially selected from described wireless sub network sequence list wireless sub network with request set up connect, until obtain with Meaning sets up the answer signal connected；If finally not having wireless sub network to agree to set up connection, the most described SDN controller is by described nothing Line terminal forces to access described optimal wireless subnet.
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