CN106304229B - A method of the software definition wireless Mesh netword based on content storage - Google Patents
A method of the software definition wireless Mesh netword based on content storage Download PDFInfo
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- CN106304229B CN106304229B CN201610689204.XA CN201610689204A CN106304229B CN 106304229 B CN106304229 B CN 106304229B CN 201610689204 A CN201610689204 A CN 201610689204A CN 106304229 B CN106304229 B CN 106304229B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Abstract
The invention discloses a kind of software definition wireless Mesh networds based on content storage, the controller that the program wherein controls in plane possesses global network state information, it can be realized the routing decision based on service request and network state information, the Mesh router of data plane transmits data according to the routing decision result that controller issues, and realizes the separation of control plane and data plane.Simultaneously, Mesh router external storage equipment can realize that content stores, in the case where network state is bad, the high business of first transmission priority, when keeping in the business of low priority, and breaking in a link, business tine is kept in, and request controller pathfinding again, make full use of limited resources to realize high-quality transmission.The present invention routes data traffic using OpenFlow mechanism, and OpenFlow control flow is routed using AODV agreement, or in emergency circumstances data traffic is routed controller is inaccessible, it has been effectively relieved in the widened situation of network size and has controlled the problem of flow constantly increases.
Description
Technical field
The present invention relates to a kind of software definition wireless Mesh networds based on content storage, belong to wireless communication technique neck
Domain.
Background technique
Wireless Mesh netword is a kind of novel broadband wireless network, has the characteristics that be different from conventional wireless network,
Flexible networking, the raising network coverage, increase network capacity, reduction up-front investment etc. all show biggish advantage, especially
It is suitble to realize broadband access and covering when lacking wired network resources.In currently employed wireless mobile Mesh technology
In, the advantage of other conventional wireless network technologies (such as wifi, 3G, 4G etc.) is merged, transmission speed is fast, can theoretically reach
It is even higher to 54Mbps, and the mesh network containing multi-hop wireless link is constituted certainly, it not only can be substantially
The coverage area of extended wireless network is spent, while bandwidth, capacity and the reliable communications that can also improve original wireless network are new.Just
Because of that wireless mobile Mesh can break through technology bottle of the conventional wireless network in terms of transmission high quality multimedia at a distance
Neck, to form the transmission network of video stream traffic.
AODV agreement is a kind of on-demand routing protocol, it needs to establish and safeguard according to business routes, at present many WMN associations
View is all improved on the basis of the agreement.The algorithm is referred to alternatively as pure demand route acquisition system, those are not in work
Node on jump path will not maintain any dependent routing information, will not participate in the exchange of any period routing table.In addition, section
Point is It is not necessary to go the routing for finding and maintaining to arrive another node, unless the two nodes are communicated.Between mobile node
Local connectivity can be obtained by several method, including using locally broadcast Hello message.Mobile node is each
A relevant destination node maintains a routing table.Each routing table includes following some information: destination address, next-hop
Address, hop count, aim sequence number and route entry life span.Routing table be used to each time transmission one grouping when, it
Life span will restart to calculate, that is, with current time add Active-Route-Timeout.If one
Mobile node is provided of the new routing for reaching some destination node, then it will be the aim sequence number of this new routing
Compared with oneself has in oneself routing table aim sequence number, and by aim sequence number it is big as the routing for reaching destination node
Table.If aim sequence number is identical, that least routing of number of nodes (hop count) that destination node is passed through is used.
Software defined network is a kind of new network of Emulex network innovation framework, and core technology OpenFlow is by by network equipment control
Face processed is separated with data surface, to realize the flexible control of network flow, the innovation for core network and application is provided
Good platform.From the design of router, it is made of software control and hardware data channel.Software control includes pipe
Reason and Routing Protocol etc..Data channel includes inquiry, exchange and the caching for each packet.If by net all in network
Network equipment is considered as the resource being managed, and can take out the concept of a network operating system, one side of this network operating system
Face has been abstracted the detail of underlay network device, while also providing unified administration view and programming for upper layer application and connecing
Mouthful.In this way, being based on this platform of network operating system, user can develop various application programs, define logic by software
On network topology, to meet to the different demands of Internet resources, without being concerned about the physical topological structure of bottom-layer network.
Summary of the invention
Technical problem: the wireless Mesh netword architecture based on software definition that the purpose of the present invention is to propose to a kind of, control
Device processed manages the status information of each Mesh router concentratedly, and Mesh router need to only realize the strategy of controller push.In addition,
Intelligent Mesh router with content storage functions can temporarily store the Business Stream of low priority, transmit the industry of high priority
Business stream efficiently solves the problems, such as to improve service transmission quality in the case that Network status is bad.
Technical solution is as follows:
1. a kind of software definition wireless Mesh netword method based on content storage, comprising:
(1) the wireless Mesh netword architecture based on software definition separates control plane with data plane, wherein controlling
The global network state information that controller in device plane processed will acquire is classified as several important information tables and is stored in control
In the physical storage media of device, the information that each decision needs can be obtained from these information tables, as the defeated of decision
Enter, while the result of decision exported can also be used to update relevant information table；Mesh router in data plane can point
It is connected to putting or repeatedly jumping, so as to constitute Mesh structure, realize the routing decision result that controller issues.Some of them
Mesh router also has gateway function, referred to as Mesh gateway, can provide the connection of Internet.
Determinant attribute includes: in the explanation of the important information table of controller storage and every table
Business stream information table: Internet is capable of providing to the business stream information of user, the type comprising business, in real time
The attributes such as property, transmission rate, data package size；
Mesh route-map table: the available resources of each Mesh router, such as available bandwidth are represented；
Client accesses mapping table: the connection relationship of the client of bottom and Mesh router being abstracted as mapping table, is built
Stand the mapping of connection relationship between the two；
Flow table: including the attributes such as the routing decision result of corresponding service, service priority, transmission rate；
Service request table: the service requesting information that client is initiated, including client id, traffic ID, service priority, biography
Defeated rate etc.；
Content storage table: it indicates that it is temporary to have recorded Mesh router when link occurs to interrupt or network state is bad
The table of the type of service of storage.
(2) the routing forwarding mechanism based on content storage
Mesh router of the invention realizes content storage by external storage equipment.Due to the limitation of wireless Mesh netword
Property, business encounters network state in transmission and is not able to satisfy transmission or in the case where being frequent link down, is considered as drawing
Enter content memory mechanism, when such as breaking in a link, keeps in business tine, then request controller pathfinding again, in addition, in network
It, can be in the case where out of order (whether network state is good, can judge from parameters such as average delay, average packet loss ratios)
The high business of prioritised transmission priority keeps in the business of low priority, and limited resources is made full use of to realize high-quality transmission.Separately
Outside, the establishment of neighbor node is used uniformly Hello acknowledgement mechanism, intermediate node periodic broadcast Hello message, with more new route
Every terms of information (such as average delay, average packet loss ratio, path can use minimum bandwidth), broadcast Hello message period value
Range is 100 milliseconds to 300 milliseconds.
Specific steps are as follows:
Step 2-1: controller constantly receives user's request, for the traffic assignments transmission path of request, issues route results；
Step 2-2: in business transmission process, current Mesh router needs to judge the neighbor list NB_INFO of the node
In whether contain the next-hop of decision path, if not having, illustrate that link has broken, carry out business storage at this time, while sending out again
Hello message detection packet detection link repair situation is sent (if link does not repair, to carry out step 2-3.If link repair is complete
At thening follow the steps 2-4).If containing the next-hop of decision path in NB_INFO, step 2-4 is carried out；
Step 2-3: the node sends RREQ and carries out pathfinding again to controller, then carries out since present node normal
Transmission；
Whether good step 2-4: judging network state, if well, carrying out normal transmission.The bad execution of network state
Step 2-5；
Step 2-5: storage service carries out business transmission according to priority from high to low, and non-transmission services start waiting to count
When；
Step 2-6: if the waiting time is greater than network patient time T_ALLOW_TIME, (T_ALLOW_TIME value range is
3 seconds to 5 seconds), then repeatedly step 2-3, no to then follow the steps 2-5.
(3) OpenFlow and AODV agreement cooperate with routing forwarding mechanism
Data exchange is carried out by multi-hop data forwarding mechanism between node in order to make wireless Mesh netword, needs to route
Agreement is grouped forwarding, and in view of the unstable state of wireless Mesh netword, suitable using On-demand routing protocol comparison, because
This present invention uses AODV agreement.But under the network of pure AODV, interaction between Mesh router and controller and
Route construction after controller return routing decision can generate a large amount of control flow with the continuous expansion of network size, institute
The corresponding OpenFlow of software defined network is introduced into wireless Mesh netword with the present invention, specifically, is used
OpenFlow mechanism routes data traffic, and is routed using AODV agreement to OpenFlow control flow, or
In emergency circumstances data traffic is routed controller is inaccessible.
Specific steps are as follows:
Step 3-1: initialization, each Mesh router operation AODV treaty shopping reach the path of controller to send
OFPT_HELLO message, to establish the management passage between controller and each router；
Step 3-2: every T time interval, router are sent using OFPT_PORT_FEATURES message to controller primary
The node and link information that each router obtains, to update all network state tables of controller, T time interval can be taken as 1
Second was to 3 seconds；
Step 3-3: client initiating business request, the strongest Mesh router of selection signal is as access point；
Step 3-4: maintain controller node routing table in the Mesh router of access, records current Mesh router
To the routing of controller, then tables look-up and send RREQ_S service requesting information to controller；
Step 3-5: after controller receives business request information, integrated network global state information, according to optimization method
Make routing decision；
Step 3-6: the result after routing decision can be written as the stream corresponding to the planning path by controller software
Table, form such as:<header field, operation>, recycle the basic method for searching of AODV agreement that flow table is transmitted to corresponding Mesh and route
Device and Mesh gateway；
Step 3-7: data flow successively transmits arrival since the Mesh gateway being connected with Internet, according to flow table rule
Client.
In the routing forwarding mechanism that (2) are stored based on content, the sequence according to service priority is real-time from high to low
Business (such as video and voice service), non-real-time service (such as HTTP business), the business (such as ftp business) done one's best.
Beneficial effect
The invention proposes a kind of software definition wireless Mesh networds based on content storage, wherein the control in control plane
Device processed possesses global network state information, can be realized optimal routing decision, the Mesh router of data plane is according to control
The routing decision result that device processed issues transmits data, realizes the separation of control plane and data plane.Meanwhile Mesh router
External storage equipment can realize that content stores, and in the case where network state is bad, the high business of first transmission priority is kept in low
The business of priority, and when breaking in a link, business tine is kept in, and request controller pathfinding again makes full use of limited money
Realize high-quality transmission in source.
Detailed description of the invention
Total system frame diagram Fig. 1 of the invention；
The present invention is based on the routing forwarding flow charts that content stores by Fig. 2；
The information exchange flow chart that Fig. 3 neighbor node relationship of the present invention is established；
Control flow and data flow path figure Fig. 4 of the invention.
Specific embodiment
Below with reference to the drawings and specific embodiments, the present invention will be described in detail.
1. as shown in Figure 1, wireless Mesh netword architecture of the present invention according to software definition, will control plane and data
Planar separation, the global network state information that controller will acquire are classified as several important information tables and are stored in controller
In physical storage media, the information that each decision needs can be obtained from these information tables, as the input of decision, together
When the result of decision that exports can also be used to update relevant information table.Mesh router in data plane can it is point-to-point or
It repeatedly jumps connected, so as to constitute Mesh structure, realizes the routing decision result that controller issues.Some of them Mesh routing
Device also has gateway function, referred to as Mesh gateway, can provide the connection of Internet.
Determinant attribute includes: in the explanation of the important information table of controller storage and every table
Business stream information table: Internet is capable of providing to the business stream information of user, the type comprising business, in real time
The attributes such as property, transmission rate, data package size；
Mesh route-map table: the available resources of each Mesh router, such as available bandwidth are represented；
Client accesses mapping table: the connection relationship of the client of bottom and Mesh router being abstracted as mapping table, is built
Stand the mapping of connection relationship between the two；
Flow table: including the attributes such as the routing decision result of corresponding service, service priority, transmission rate；
Service request table: the service requesting information that client is initiated, including client id, traffic ID, service priority, biography
Defeated rate etc.；
Content storage table: it indicates that it is temporary to have recorded Mesh router when link occurs to interrupt or network state is bad
The table of the type of service of storage.
2. as shown in Fig. 2, Mesh router of the invention realizes that content stores by external storage equipment.Due to wireless
The limitation of Mesh network, business encounter network state and are not able to satisfy transmission or are frequent link down in transmission
In the case of, it is considered as introducing content memory mechanism, when such as breaking in a link, keeps in business tine, then request controller is again
Pathfinding, in addition, (whether network state is good, can be from average delay, average packet loss ratio etc. in the case where network state is bad
Parameter judges), business that can be high with prioritised transmission priority keeps in the business of low priority, makes full use of limited resources real
Existing high-quality transmission.In addition, the establishment of neighbor node is used uniformly Hello acknowledgement mechanism, intermediate node periodic broadcast Hello
Message broadcasts Hello with the every terms of information (such as average delay, average packet loss ratio, path can use minimum bandwidth) of more new route
The period value range of message is 100 milliseconds to 300 milliseconds.
Specific steps are as follows:
Step 1: controller constantly receives user's request, for the traffic assignments transmission path of request, issues route results；
Step 2: in business transmission process, current Mesh router needs to judge in the neighbor list NB_INFO of the node
The next-hop of decision path whether is contained, if not having, illustrates that link has broken, carries out business storage at this time, while sending again
Hello message detection packet detection link repair situation (if link does not repair, carries out step 3.If link repair is completed,
Execute step 4).If containing the next-hop of decision path in NB_INFO, step 4 is carried out；
Step 3: the node sends RREQ and carries out pathfinding again to controller, is then normally passed since present node
It is defeated；
Step 4: whether good network state is judged, if well, carrying out normal transmission.Network state is bad to execute step
Rapid 5；
Step 5: storage service carries out business transmission according to priority from high to low, and non-transmission services start waiting timing；
Step 6: if the waiting time is greater than network patient time T_ALLOW_TIME, (T_ALLOW_TIME value range is 3
Second to 5 seconds), then repeatedly step 3, no to then follow the steps 5.
3. the whole process for establishing neighborhood between Mesh node and Mesh node of the invention is as shown in Figure 3.Below
Whole process is described in detail.
Step 1: source node is broadcast periodically hello packet, period T；
Step 2: after neighbor node receives a hello packet, one Hello_ACK message of horse back response；
Step 3: step 1 and 2 is repeated, after source node receives n continuous Hello_ACK response messages, neighbor node chain
Foundation is connect, which is added to routing table；
Step 4: after source node continues periodic broadcast hello packet T_ALLOW_LOSS, there are no receive the neighbours
The Hello_ACK response message that node is sent back to, then link disconnects, which is deleted from routing table, T_ALLOW_LOSS
Value range is generally 10 seconds to 15 seconds.
4. as shown in figure 4, between node of the present invention in order to make wireless Mesh netword by multi-hop data forwarding mechanism into
Row data exchange needs Routing Protocol to be grouped forwarding, and in view of the unstable state of wireless Mesh netword, uses on-demand
Routing Protocol is proper, therefore the present invention uses AODV agreement.But under the network of pure AODV, Mesh router and control
The route construction after interaction and controller return routing decision between device processed can be produced with the continuous expansion of network size
Raw a large amount of control flow, so the corresponding OpenFlow of software defined network is introduced into wireless Mesh netword by the present invention,
Specifically, data traffic is routed using OpenFlow mechanism, and AODV agreement is used to control flow to OpenFlow
It is routed, or in emergency circumstances data traffic is routed controller is inaccessible.Specific step described further below
Suddenly.
Specific steps are as follows:
Step 1: initialization, each Mesh router operation AODV treaty shopping reach the path of controller to send
OFPT_HELLO message, to establish the management passage between controller and each router；
Step 2: every T time interval, router are sent using OFPT_PORT_FEATURES message to controller primary each
The node and link information that router obtains, to update all network state tables of controller, T time interval be can be taken as 1 second
To 3 seconds；
Step: 3: client initiating business request, the strongest Mesh router of selection signal is as access point；
Step 4: maintain controller node routing table in the Mesh router of access, record current Mesh router and arrive
Then the routing of controller tables look-up and sends RREQ_S service requesting information to controller；
Step 5: after controller receives business request information, integrated network global state information is done according to optimization method
Routing decision out；
Step 6: the result after routing decision can be written as the flow table corresponding to the planning path by controller software,
Form is such as:<header field, operation>, recycle the basic method for searching of AODV agreement by flow table be transmitted to corresponding Mesh router and
Mesh gateway；
Step 7: data flow successively transmits arrival visitor since the Mesh gateway being connected with Internet, according to flow table rule
Family end.
Claims (2)
1. a kind of method of the software definition wireless Mesh netword based on content storage characterized by comprising
(1) the wireless Mesh netword architecture based on software definition separates control plane with data plane, wherein control is flat
The global network state information that controller in face will acquire is classified as the physical storage media that information table is stored in controller
In, the information that each decision needs is obtained from these information tables, as the input of decision, while the result of decision exported
For updating relevant information table；Mesh router in data plane it is point-to-point or repeatedly jump it is connected, realize controller under
The routing decision result of hair；
Determinant attribute includes: in the explanation of the information table of controller storage and every table
Business stream information table: Internet is capable of providing type, real-time, biography to the business stream information of user, comprising business
Defeated rate, data package size attribute；
Mesh route-map table: the available resources of each Mesh router, available bandwidth are represented；
Client accesses mapping table: the connection relationship of the client of bottom and Mesh router being abstracted as mapping table, establishes two
The mapping of connection relationship between person；
Flow table: including routing decision result, the service priority, transmission rate attribute of corresponding service；
Service request table: the service requesting information that client is initiated, including client id, traffic ID, service priority, transmission speed
Rate；
Content storage table: it indicates to have recorded Mesh router when link occurs to interrupt or network state is bad and temporarily store
Type of service table；
(2) the routing forwarding mechanism based on content storage
Mesh router realizes content storage by external storage equipment；Business encounters link down, need to keep in industry in transmission
Business content, then request controller pathfinding again；In the case where network state is bad, the high business of prioritised transmission priority,
The business of temporary low priority, makes full use of limited resources to realize high-quality transmission;
Specific steps are as follows:
Step 2-1: controller constantly receives user's request, for the traffic assignments transmission path of request, issues route results；
Step 2-2: in business transmission process, current Mesh router need to judge be in the neighbor list NB_INFO of the node
It is no to contain the next-hop of decision path, if not having, illustrate that link has broken, carries out business storage at this time, while sending again
Hello message detection packet detection link repair situation；If link does not repair, step 2-3 is carried out；If link repair is completed,
Then follow the steps 2-4；If containing the next-hop of decision path in NB_INFO, step 2-4 is carried out；
Step 2-3: the node sends RREQ and carries out pathfinding again to controller, is then normally passed since present node
It is defeated；
Whether good step 2-4: judging network state, if well, carrying out normal transmission；The bad execution step of network state
2-5；
Step 2-5: storage service carries out business transmission according to priority from high to low, and non-transmission services start waiting timing；
Step 2-6: if the waiting time is greater than network patient time T_ALLOW_TIME, value range is 3 seconds to 5 seconds, then repeats
Step 2-3, it is no to then follow the steps 2-5；
(3) OpenFlow and AODV agreement cooperate with routing forwarding mechanism, specific steps are as follows:
Step 3-1: initialization, each Mesh router operation AODV treaty shopping reach the path of controller to send OFPT_
HELLO message, to establish the management passage between controller and each router；
Step 3-2: every T time interval, router send primary each road to controller using OFPT_PORT_FEATURES message
The node and link information obtained by device, to update all network state tables of controller, T time interval is taken as 1 second to 3
Second；
Step 3-3: client initiating business request, the strongest Mesh router of selection signal is as access point；
Step 3-4: maintain controller node routing table in the Mesh router of access, records current Mesh router to control
Then the routing of device processed tables look-up and sends RREQ_S service requesting information to controller；
Step 3-5: after controller receives business request information, integrated network global state information is made according to optimization method
Routing decision；
Step 3-6: the result after routing decision is written as the flow table corresponding to the planning path by controller software, and form is
<header field, operation>, recycle the basic method for searching of AODV agreement that flow table is transmitted to corresponding Mesh router and Mesh net
It closes；
Step 3-7: data flow is successively transmitted according to flow table rule since the Mesh gateway being connected with Internet and reaches client
End.
2. the method according to claim 1, wherein being based partially on the routing forwarding mechanism of content storage in (2)
In, the sequence according to service priority is real time business, non-real-time service, the business done one's best from high to low.
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| CN111314954A (en) * | 2018-12-12 | 2020-06-19 | 华为技术有限公司 | Data transmission method and device |
| CN111279729A (en) * | 2019-11-12 | 2020-06-12 | 深圳市汇顶科技股份有限公司 | Data transmission method and BLE equipment |
| CA3172377A1 (en) * | 2020-02-20 | 2021-08-26 | Atc Technologies, Llc | Cdma-ia network concept of operations and media access control (mac) layer |
| CN112512091B (en) * | 2020-11-02 | 2021-11-05 | 四川天邑康和通信股份有限公司 | Multi-outlet mesh network router configuration method and device |
| JP7121821B1 (en) * | 2021-03-05 | 2022-08-18 | ソフトバンク株式会社 | Communication system, communication device, program, and processing method |
| CN113949902B (en) * | 2021-09-28 | 2022-12-20 | 天翼物联科技有限公司 | Video distribution control method, system, device and storage medium |
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