CN111918314B - Mobile network optimization method and system based on distributed SDN - Google Patents
Mobile network optimization method and system based on distributed SDN Download PDFInfo
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Abstract
The application discloses a mobile network optimization method and system based on a distributed SDN, which are used for solving the problems of uneven distribution of mobile network resources, unbalanced load and influence on network quality and stability. The SDN sub-controller adjusts the allocated bandwidth of each mobile terminal based on a preset trigger condition according to a first bandwidth calculation algorithm, the total bandwidth of the current network providing equipment, the actual use bandwidth and the allocated bandwidth of the accessed mobile terminal; the SDN sub-controller adjusts the allocated bandwidth of each network switching device in the current subarea according to the second bandwidth calculation algorithm, the total bandwidth of the current subarea, the actual use bandwidth and the allocated bandwidth of each network switching device in the current subarea; and the SDN parent controller adjusts the allocated bandwidth of each SDN sub-controller according to the third bandwidth calculation algorithm, the total bandwidth of the total area, and the actual use bandwidth, the allocated bandwidth and the redundant bandwidth of the SDN sub-controller corresponding to each sub-area in the total area.
Description
Technical Field
The present disclosure relates to the field of mobile network optimization, and in particular, to a mobile network optimization method and system based on a distributed SDN.
Background
With the rapid development of the mobile internet and the rapid growth of the number of mobile terminals, the data that the cellular network needs to carry increases exponentially.
At present, in the scene of more mobile terminals, the problems of unsmooth communication and the like caused by data overload are solved by adopting schemes of high bandwidth, gradual deployment and lower cost such as WiFi access points, relay nodes and the like.
And the mobile terminal can realize certain data management and control functions through an Access Network Discovery and Selection Function (ANDSF) so as to select and access the current optimal network according to the network selection preference information of the user and the requirement of the mobile terminal, thereby realizing good connection of the network to a certain extent.
However, the ANDSF function lacks load balancing optimization at the network side, and in some cases, there is a problem of uneven allocation of mobile network resources, so that situations such as unbalanced load and unstable network are caused, and the use experience of the user is affected.
Particularly, in a wide area network range with dense terminal distribution such as stadiums, business areas, smart cities and the like under certain high-load scenes, the mobile network provided by WiFi still has the problem of unbalanced load, and the network quality is adversely affected.
Disclosure of Invention
The embodiment of the application provides a mobile network optimization method and system based on a distributed SDN, which are used for solving the problems of uneven distribution of mobile network resources, unbalanced load, and influence on network quality and network stability.
The mobile network optimization method based on the distributed SDN provided by the embodiment of the application comprises the following steps:
the SDN child controller acquires network equipment information in the current sub-area, sends the network equipment information to the SDN parent controller and receives relevant information of network equipment issued by the SDN parent controller;
the SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset trigger condition, a first bandwidth calculation algorithm, the total bandwidth of the current network providing equipment, the actual use bandwidth and the allocated bandwidth of the mobile terminal accessed by the current network providing equipment;
the SDN sub-controller adjusts the allocated bandwidth of each network switching device in the current subarea according to the second bandwidth calculation algorithm, the total bandwidth of the current subarea, the actual use bandwidth and the allocated bandwidth of each network switching device in the current subarea;
and the SDN parent controller adjusts the allocated bandwidth of each SDN sub-controller according to the third bandwidth calculation algorithm, the total bandwidth of the total area, and the actual use bandwidth, the allocated bandwidth and the redundant bandwidth of the SDN sub-controller corresponding to each sub-area in the total area.
In one example, adjusting the allocated bandwidth for each mobile terminal includes: determining the priority corresponding to each mobile terminal according to the equipment type of each mobile terminal; and respectively adjusting the allocated bandwidths of the mobile terminals in sequence according to the priorities of the mobile terminals.
In one example, adjusting the allocated bandwidth for each network switching device within the current sub-area includes: determining the priority corresponding to each network switching device according to the minimum guaranteed bandwidth of each network switching device in the current subarea; wherein, the minimum guaranteed bandwidth and the priority form a positive correlation; and respectively adjusting the allocated bandwidths of the network switching devices in the current subarea according to the priority of the network switching devices in sequence.
In one example, adjusting the allocated bandwidth of each SDN sub-controller includes: determining the priority of the sub-region corresponding to each SDN sub-controller according to the residual quantity of the redundant bandwidth of each SDN sub-controller; and respectively adjusting the allocated bandwidths of the SDN sub-controllers in sequence according to the priorities of the sub-regions.
In one example, the preset trigger condition includes: reaching a preset inspection period; the addition or deletion of SDN subcontrollers exists; there is an addition or deletion of network switching devices.
In one example, the method further comprises: and when the actual used bandwidth of the subarea is not smaller than the sum of the allocated bandwidth and the redundant bandwidth, triggering a third bandwidth calculation algorithm, and adjusting the allocated bandwidth of the subarea.
In one example, the method further comprises: according to an access request of a mobile terminal to be connected and the first bandwidth calculation algorithm, determining network providing equipment matched with the access request; the access request comprises mobile terminal information of the mobile terminal to be connected; and accessing the mobile terminal to be connected to the matched network providing equipment.
In one example, the method further comprises: if no network providing equipment matched with the access request exists, determining the mobile terminal with low activity from all connected mobile terminals, and adjusting the allocated bandwidth of the mobile terminal with low activity; the low activity level indicates that the difference between the actual use bandwidth and the allocated bandwidth of the mobile terminal is larger than a first preset threshold value, and the network peak value change is smaller than a second preset threshold value in a preset time period; determining network providing equipment matched with the access request according to the first bandwidth calculation algorithm again; and rejecting the access request if the network providing equipment matched with the access request does not exist.
In one example, accessing the mobile terminal to be connected to the matched network providing device includes: determining whether mobile terminal information matched with the MAC address exists in a database according to the MAC address of the mobile terminal to be connected; and if the matched mobile terminal information exists, determining to continue adopting the content of the matched mobile terminal information.
The embodiment of the application provides a mobile network optimization system based on a distributed SDN, which comprises:
SDN subcontroller, set up in each subregion, connect with network switching equipment, is used for summarizing the network equipment information of the present subregion, and based on the triggering condition of presetting, according to the first bandwidth calculation algorithm, adjust the assigned bandwidth of each mobile terminal in the present subregion, according to the second bandwidth calculation algorithm, adjust the assigned bandwidth of each network switching equipment in the present subregion;
the SDN father controller is connected with each SDN sub-controller, and is used for acquiring network equipment information from each SDN sub-controller and adjusting the allocated bandwidth of each sub-area according to a third bandwidth calculation algorithm;
the network switching equipment is connected with the corresponding SDN sub-controller and the network providing equipment and is used for collecting own network equipment information and sending the network equipment information to the corresponding SDN sub-controller;
The network providing device is connected with the corresponding network switching device and the mobile terminal and is used for collecting network device information of the connected mobile terminal and sending the network device information to the corresponding SDN sub-controller;
the mobile terminal is used for establishing connection with the matched network providing equipment according to the instruction of the SDN subcontroller;
the interaction device is connected with the SDN sub-controller and the SDN father controller and is used for displaying network device information and sending instructions to the SDN sub-controller and the SDN father controller based on user operation so as to modify the network device information.
The embodiment of the application provides a mobile network optimization method and system based on a distributed SDN, which at least comprise the following beneficial effects:
through the SDN controller of distributed deployment, the whole flow regulation and control can be carried out on each subarea in the wide area network, and the targeted bandwidth regulation and control can be carried out on network equipment in each subarea. Therefore, the data processing pressure of SDN sub-controllers among all sub-areas can be reduced, and the problems of time delay and bandwidth occupation caused by more network devices and larger data transmission capacity when wide area networks and other large-range areas are managed are solved.
The SDN father controller can regulate and control the bandwidth among all subareas in a large range in the total area range, senses the network pressure among all subareas by collecting the network equipment information of all subareas, and flexibly regulates and controls according to the network pressure so as to ensure the network stability among different subareas in the wide area network.
The SDN sub-controller only needs to process the bandwidth regulation and control of the network equipment in the small range of the current sub-region, so that the performance pressure on the SDN sub-controller is reduced. Meanwhile, the SDN subcontroller uses ANDSF and OpenFlow protocols as actual issuers of configuration and small-range regulators in the subareas, so that operations such as bandwidth regulation and fault detection and the like are realized on each network device in the current subarea, accurate regulation in the small range can be realized, and the timeliness and precision control of regulation are ensured.
The optimization of the mobile network use experience of the mobile terminals in a plurality of subareas can be ensured simultaneously through the bandwidth regulation and control of the network switching equipment and the mobile terminal equipment in the subareas and the large-range regulation and control of the total bandwidth among the subareas. Therefore, bandwidth coordination among network devices in each subarea can be realized, the service quality of a mobile network is improved, and the network robustness is enhanced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
Fig. 1 is a schematic structural diagram of a mobile network optimization system based on a distributed SDN provided in an embodiment of the present application;
fig. 2 is a flowchart of a mobile network optimization method based on a distributed SDN provided in an embodiment of the present application;
fig. 3 is a flowchart of another mobile network optimization method based on a distributed SDN according to an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Fig. 1 is a schematic structural diagram of a mobile network optimization system based on a distributed SDN, which is provided in the embodiments of the present application, and the system mainly includes an SDN parent controller 1, an SDN child controller 2, a network switching device 3, a network providing device 4, a mobile terminal 5, a database 6 and an interaction device 7.
Specifically, the system is arranged in a wide area network corresponding to the total area, and an SDN parent controller 1 is arranged in the wide area network. The total area comprises a plurality of subareas A-N, each subarea is respectively provided with an SDN (software defined network) subcontroller 2, and the SDN subcontroller 2 is connected with all network switching devices 3 in the current subarea. Each network switching device 3 is connected to a corresponding network providing device 4, each network providing device 4 having several mobile terminals 5 connected thereto.
The SDN parent controller 1 is disposed in the entire wide area network, and is configured to obtain network device information between sub-areas, and receive network device information from the SDN child controller 2 in the corresponding sub-area. The SDN father controller can adjust the network topology structure of each sub-area according to the received network equipment information, and regulate and control the whole flow among the sub-areas. The SDN parent controller may also send all network device information to the interaction device 7 for display. The network equipment comprises an SDN sub-controller, network switching equipment, network providing equipment, a mobile terminal and the like, and the network equipment information comprises information such as a topological structure, bandwidth, load and the like.
The SDN child controller 2 is provided in each sub-area and connected to the SDN parent controller 1. The SDN sub-controller 2 is configured to obtain and collect network device information of all network devices in the current sub-area, and send the network device information to the SDN parent controller. And, the SDN sub-controller may also send all network device information to the interaction device 7 for display.
The SDN subcontroller is also used for managing the network switching equipment supporting the OpenFlow protocol according to the OpenFlow protocol and the flow table mode to complete the actual configuration issuing so as to realize the bandwidth regulation and control of the ports of the network switching equipment. The SDN sub-controller is further configured to reasonably allocate bandwidth of the mobile terminal in the current sub-area, and select an appropriate network providing device for the mobile terminal to be accessed.
The network switching device 3 is connected with the SDN sub-controller in the current sub-area, and is configured to collect network topology information, bandwidth information and the like of the network switching device, send the network topology information and the bandwidth information to the SDN sub-controller, and adjust the bandwidth information of the network switching device according to configuration information issued by the SDN sub-controller. The network switching device is a network device such as a switch and a router supporting an OpenFlow protocol.
The network providing device 4 is connected to the corresponding network switching device 3 and is also connected to a plurality of mobile terminals for providing wireless network services to the mobile terminals. The network providing device can collect network topology information, bandwidth information, mobile terminal information and the like of the accessed mobile terminal and send the network topology information, the bandwidth information, the mobile terminal information and the like to the SDN sub-controller. Wherein the network providing device comprises a home router and the like
The mobile terminal 5 is configured to determine, under the control of the SDN sub-controller, an accessed network providing device through an access network discovery and selection function ANDSF.
The database 6 is in communication with the SDN parent controller and the SDN child controller, and can store network topology information, bandwidth information, mobile terminal information and the like of each network device in the system acquired by the SDN parent controller and the SDN child controller
The interaction device 7 communicates with an SDN parent controller, an SDN child controller. The interaction device comprises an SDN parent controller interaction interface, an SDN sub-controller network switching device interaction interface and an SDN sub-controller mobile terminal interaction interface.
The SDN parent controller interaction interface may display network device information of each SDN child controller, bandwidth information of each sub-region, topology information of each sub-region, and priority, and may determine a minimum guaranteed bandwidth and a redundant bandwidth set for each sub-region based on a user operation. The network switching equipment interaction interface of the SDN sub-controller can display bandwidth information, topology information and priority of each network switching equipment in the current subarea, and can set or modify the minimum guaranteed bandwidth and priority of each network switching equipment based on user operation. The SDN sub-controller mobile terminal interaction interface may display bandwidth information of each network providing device, information of the mobile terminal, bandwidth information, and priority in the current sub-area, and may set or modify minimum guaranteed bandwidth, priority, and priority determination rules of each mobile terminal based on user operations.
In the embodiment of the application, the main area corresponding to the wide area network is integrally controlled by the SDN father controller and the SDN child controller which are distributed, and each sub-area governed by the main area is respectively controlled by the SDN child controller. Therefore, the data processing pressure of SDN sub-controllers among all sub-areas can be reduced, and the problems of time delay and bandwidth occupation caused by more network devices and larger data transmission capacity when wide area networks and other large-range areas are managed are solved.
Compared with a mobile network provided by the traditional WiFi technology, the system can coordinate load pressure among all subareas, realize bandwidth regulation and control in a wide area network range and improve the overall network quality in a total area. Meanwhile, compared with the problems of uneven load distribution and the like caused by centralized use of mobile terminals in the traditional WLAN network, the system can pertinently regulate and control the bandwidth of each mobile terminal, and determine accessible network providing equipment for the mobile terminal according to the load condition of the network providing equipment, so that the robustness of the network can be enhanced.
In one embodiment, the present system may include several SDN parent controllers. During normal operation of the system, only one SDN parent controller usually plays a main role, and other SDN parent controllers serve as standby. When the SDN father controller playing a main role fails, breaks down and other abnormal conditions occur, other SDN father controllers can be started to ensure that the system can normally operate, and the robustness and the stability of the system are enhanced.
Fig. 2 is a flowchart of a mobile network optimization method based on a distributed SDN, which specifically includes the following steps:
s201: the SDN child controller acquires network device information in the current sub-area, sends the network device information to the SDN parent controller, and receives relevant information of the network device issued by the SDN parent controller.
In the embodiment of the present application, the SDN child controller in each sub-area may acquire all network device information in the current sub-area, and send the network device information to the SDN parent controller. And, the SDN sub-controller may receive related information of network devices between sub-areas, which is published by the SDN parent controller based on the network device information.
The network equipment information comprises a topological structure, mobile terminal information and the like, and the related information comprises a preset inspection period, a preset minimum guaranteed bandwidth, a preset priority and the like of each network equipment.
S202: the SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset trigger condition, a first bandwidth calculation algorithm, the total bandwidth of the current network providing device, the actual use bandwidth and the allocated bandwidth of the mobile terminal accessed by the current network providing device.
In the embodiment of the present application, the SDN parent controller and the SDN child controller may start the bandwidth calculation and regulation process for each network device based on a preset trigger condition. In the regulation and control process, the operation is sequentially performed according to the sequence of the mobile terminal, the network switching equipment and the SDN sub-controller.
Specifically, when the mobile terminal accesses the corresponding network providing device, the SDN sub-controller may determine the bandwidth allocated to the mobile terminal, and then the value of the bandwidth allocated to the mobile terminal is the upper bandwidth limit of the mobile terminal in the process of using the bandwidth.
In the bandwidth regulation and control process, the SDN sub-controller may determine, based on the first bandwidth calculation algorithm, a regulated bandwidth corresponding to the current network providing device according to a total bandwidth of the current network providing device accessed by the mobile terminal and allocated bandwidths of all mobile terminals accessed by the current network providing device. Then, the SDN sub-controller may adjust the allocated bandwidth of each mobile terminal according to the actual bandwidth used and the allocated bandwidth of the mobile terminal, and the adjustable bandwidth corresponding to the current network providing device. The controllable bandwidth represents the bandwidth which is not allocated yet and is owned by the current network providing equipment and can be freely allocated to the subordinate mobile terminal.
Wherein the first bandwidth calculation algorithm may be expressed as: s is S r ＝S ab -S mb Wherein S is r Representing the regulated bandwidth of a network providing device, S ab Representing the total bandwidth of the network providing device, S mb Representing the sum of the allocated bandwidths of all mobile terminals to which the network provides device access.
For all mobile terminals accessed by the network providing equipment, the SDN sub-controller can determine whether the allocated bandwidth of the mobile terminal needs to be adjusted according to the difference between the actual used bandwidth and the allocated bandwidth of the mobile terminal.
If the difference between the actual use bandwidth of the mobile terminal and the allocated bandwidth is smaller, which means that the actual use bandwidth required to be used by the mobile terminal is larger, and the current allocated bandwidth is likely to break through, the current allocated bandwidth is insufficient, and the bandwidth requirement of the mobile terminal may not be met. Therefore, under the condition that the controllable bandwidth of the network providing device is enough, the SDN sub-controller can improve the allocated bandwidth of the mobile terminal and allocate more bandwidth to the mobile terminal so as to ensure the normal communication of the mobile terminal.
Specifically, the SDN controller may actively initiate policy update in an ANDSF push manner to adjust a bandwidth of the mobile terminal.
If the difference between the actual use bandwidth and the allocated bandwidth of the mobile terminal is large, which means that the allocated bandwidth allocated to the mobile terminal is enough to be used currently, the current allocated bandwidth is reasonable and meets the actual requirement, and the allocated bandwidth of the mobile terminal is not required to be adjusted.
In one embodiment, the preset trigger conditions may include:
(1) Reaching the preset inspection period. The SDN sub-controller can automatically calculate and regulate the bandwidth of the network equipment in each sub-area according to the preset inspection period in the SDN parent controller when the preset inspection period is reached. The preset inspection period can be set according to requirements, and the application is not limited to the preset inspection period.
(2) There is an addition or deletion of SDN sub-controllers (i.e. sub-regions). When there is a newly added SDN sub-controller in the system, after parameter configuration is completed by the newly added SDN sub-controller or when there is an SDN sub-controller to delete, each existing SDN sub-controller may calculate and regulate the bandwidth of each network device in the system, so as to redistribute the bandwidth.
(3) There is an addition or deletion of network switching devices. When there are newly added network switching devices in the subareas or network switching devices are deleted, the SDN parent controller can recalculate and regulate the bandwidths of the network devices in each subarea.
In one embodiment, the SDN sub-controller may determine a priority of the mobile terminal according to a certain priority determination rule, and regulate the bandwidth of the mobile terminal according to the priority.
In one possible implementation, the prioritization rules may be a correspondence of device types to priorities. Then, the SDN sub-controller may determine, according to the device type of the mobile terminal accessed in the current sub-area, a priority corresponding to the mobile terminal. Then, in the process of adjusting the bandwidth, the SDN sub-controller can adjust the allocated bandwidth of each mobile terminal according to the priority of each mobile terminal accessed by the network providing device and the order of the priority. The device types of the mobile terminal include smart phones, tablet computers, intelligent computing devices and the like, and priorities corresponding to the device types can be set according to service requirements, so that the method and the device are not limited.
The higher the priority corresponding to the mobile terminal, the higher the order of bandwidth adjustment for the mobile terminal. Under the condition that the controllable bandwidth of the network providing equipment is limited, the allocated bandwidth is adjusted for the mobile terminal with high priority. There may be a case where the regulatable bandwidth is exhausted and bandwidth cannot be allocated to the mobile terminal with lower priority.
In an embodiment, the SDN sub-controller may set a corresponding minimum guaranteed bandwidth for the mobile terminal according to the priority of the mobile terminal. The minimum guaranteed bandwidth represents the minimum value of the bandwidth allocated to the mobile terminal, and the allocated bandwidth corresponding to the mobile terminal must be greater than the minimum guaranteed bandwidth.
In an embodiment, in the process of adjusting the allocated bandwidth of the mobile terminal, the SDN sub-controller may determine that a difference between the actual usage bandwidth of the mobile terminal and the allocated bandwidth is greater than a first preset threshold, and consider that the activity of the mobile terminal is low when the network peak change is less than a second preset threshold in a preset time period. Therefore, the SDN sub-controller can down-regulate the allocated bandwidth of the mobile terminal with low activity to the same value as the actually used bandwidth thereof, so as to avoid bandwidth waste and provide the bandwidth utilization. The first preset threshold, the preset time period and the second preset threshold can be set according to needs, and the application is not limited to the first preset threshold, the preset time period and the second preset threshold.
In one embodiment, the SDN sub-controller may determine a priority for the mobile terminal according to a priority range-1-64, the higher the value, the higher the priority. In a default state, the priority of the mobile terminal is 1, and at the moment, the default mobile terminal does not have the minimum guaranteed bandwidth. When the activity of the mobile terminal is low, the priority of the mobile terminal is set to 0. When the required traffic of the mobile terminal is greater than the total bandwidth of the network providing device to which the mobile terminal is connected, the priority of the mobile terminal is set to-1, and the mobile terminal is not allocated with bandwidth.
S203: and the SDN sub-controller adjusts the allocated bandwidth of each network switching device in the current subarea according to the second bandwidth calculation algorithm, the total bandwidth of the current subarea, the actual use bandwidth and the allocated bandwidth of each network switching device in the current subarea.
In this embodiment of the present application, the SDN sub-controller may determine, based on the second bandwidth calculation algorithm, an adjustable bandwidth corresponding to the current sub-area according to a total bandwidth of the current sub-area to which the network switching device belongs and an allocated bandwidth of all network switching devices in the current sub-area. Then, the SDN sub-controller may adjust the allocated bandwidth of each network switching device port according to the actual used bandwidth and the allocated bandwidth of each network switching device, and the adjustable bandwidth corresponding to the current sub-region. The controllable bandwidth represents the bandwidth which is owned by the current subarea and is not allocated yet, and can be allocated to subordinate network switching equipment freely.
Specifically, the second bandwidth calculation algorithm may be expressed as: s is S iaab ＝S aab -S kb Wherein S is iaab Representing the controllable bandwidth of a sub-region, S aab Representing the total bandwidth of the sub-region, S kb Representing the sum of the allocated bandwidths of all network switching devices in the current sub-area.
For all network switching devices in the subarea, the SDN sub-controller may determine whether the allocated bandwidth of the network switching device needs to be adjusted according to a difference between an actual usage bandwidth and the allocated bandwidth of the network switching device.
If the difference between the actual used bandwidth and the allocated bandwidth of the network switching device is smaller, which means that the actual used bandwidth required to be used by the network switching device is larger, and the current allocated bandwidth is likely to break through, the current allocated bandwidth is insufficient, and the bandwidth requirement of the network switching device may not be met. Therefore, under the condition that the controllable bandwidth of the current subarea is enough, the SDN subcontroller can improve the allocated bandwidth of the network switching equipment and allocate more bandwidth to the network switching equipment so as to ensure the normal communication of the network switching equipment.
The SDN sub-controller may issue a flow table to a network switching device supporting the OpenFlow protocol, so as to implement adjustment of a bandwidth of the network switching device.
If the difference between the actual used bandwidth and the allocated bandwidth of the network switching equipment is larger, which means that the allocated bandwidth allocated to the network switching equipment is enough to be used currently, the current allocated bandwidth is set reasonably, and the actual requirement is met, and the allocated bandwidth of the network switching equipment does not need to be adjusted.
In one embodiment, the SDN sub-controller may set a minimum guaranteed bandwidth for each network switching device connected. The minimum guaranteed bandwidth represents the minimum value of the allocated bandwidth for the network switching device, and the allocated bandwidth corresponding to the network switching device must be greater than the minimum guaranteed bandwidth.
Thus, the second bandwidth calculation algorithm may be expressed as: s is S iaab ＝S aab -S hb -S db Wherein S is iaab Representing the controllable bandwidth of a sub-region, S aab Representing the total bandwidth of the sub-region, S hb Representing the sum of minimum guaranteed bandwidths of network switching devices of non-default priority in the current sub-area, S db The sum of the allocated bandwidths of the network switching devices representing the default priorities within the current sub-area.
In one embodiment, the SDN sub-controller may determine a priority corresponding to each network switching device according to a minimum guaranteed bandwidth of each network switching device in the current sub-area. And then, in the process of adjusting the bandwidth, the SDN subcontroller can respectively adjust the allocated bandwidth of each network switching device according to the priority of each network switching device in the current subarea and the order of the priority. Wherein, the minimum guaranteed bandwidth of the network switching equipment and the priority form a positive correlation, and the larger the value of the minimum guaranteed bandwidth is, the higher the corresponding priority is.
The higher the priority corresponding to the network switching device, the higher the order of bandwidth adjustment for the network switching device. And under the condition that the controllable bandwidth of the current subarea is limited, firstly, adjusting the allocated bandwidth for the network switching equipment with high priority. There may be situations where the regulated bandwidth is exhausted and no additional bandwidth can be allocated to the lower priority network switching device.
In one embodiment, the SDN sub-controller may determine a priority for the network switching device according to a priority range of 0-255. The higher the priority value, the higher the corresponding priority. In a default state, the priority of the network switching device is 1, and at this time, the minimum guaranteed bandwidth is not set for the network switching device by default. When the priority of the network switching device is 0, the SDN sub-controller may set the upper bandwidth limit of the port of the network switching device to 0, i.e. not set the allocated bandwidth for the network switching device.
S204: and the SDN father controller adjusts the allocated bandwidth of each sub-area according to the third bandwidth calculation algorithm, the total bandwidth of the total area, and the actual use bandwidth, the allocated bandwidth and the redundant bandwidth of the SDN sub-controller corresponding to each sub-area in the total area.
In the embodiment of the application, the SDN parent controller may determine a minimum guaranteed bandwidth and a redundant bandwidth set in advance for SDN child controllers corresponding to each sub-region under the total region. The minimum guaranteed bandwidth is indicated as the minimum value of the allocated bandwidth of the SDN sub-controller, that is, the allocated bandwidth corresponding to the SDN sub-controller cannot be smaller than the minimum guaranteed bandwidth. The redundant bandwidth represents the bandwidth which is reserved for each subarea in addition to the allocated bandwidth and is used for coping with the situations of sudden increase of bandwidth demand in the subarea and the like, and the redundant bandwidth can be allocated to network equipment in the current subarea by the SDN subcontroller, so that the redundant bandwidth is a insurance measure. If the actual bandwidth used in the sub-area reaches the value of the allocated bandwidth and more bandwidth is needed, the SDN sub-controller may continue to occupy the corresponding bandwidth within the range of the redundant bandwidth.
In the bandwidth regulation and control process, the SDN total controller can determine the regulatable bandwidth corresponding to the total area according to the total bandwidth of the total area, the allocated bandwidth and the redundant bandwidth of each sub-area based on the third bandwidth calculation algorithm. And then, the SDN master controller can adjust the allocated bandwidth of each subarea according to the actual use bandwidth, the minimum guaranteed bandwidth and the redundant bandwidth of each subarea and the adjustable bandwidth corresponding to the master area. The adjustable bandwidth represents the bandwidth which is not allocated yet and corresponds to the total area, and can be allocated to each subarea freely.
Specifically, the third bandwidth calculation algorithm may be expressed as: s is S taab ＝S rtb -S fb -S rsb Wherein S is taab A controllable bandwidth representing the total area, S rtb Representing the total bandwidth of the total area S fb Representing the sum of minimum guaranteed bandwidths of the subareas S rsb Representing the sum of the redundant bandwidths of the sub-areas. And S is aab ＝S rb +S sb Wherein S is aab Representing the total bandwidth of the sub-region, S rb Representing allocated bandwidth of sub-region S sb Representing the redundant bandwidth of the sub-region.
For each sub-area, the SDN parent controller may determine whether the allocated bandwidth of the sub-area needs to be adjusted according to a difference between the actual used bandwidth and the total bandwidth of each sub-area.
If the difference between the actual use bandwidth of the sub-area and the total bandwidth is smaller, which means that the actual use bandwidth required to be used by the corresponding SDN sub-controller is larger, and the current allocated bandwidth is likely to break through, the current allocated bandwidth is insufficient, and the bandwidth requirement of the sub-area may not be met. Therefore, under the condition that the controllable bandwidth of the total area is enough, the SDN parent controller can improve the allocated bandwidth of the sub-area and allocate more bandwidth to the sub-area so as to ensure the normal communication of the SDN sub-controller.
If the difference between the actual use bandwidth of the sub-area and the allocated bandwidth is large, the current allocated bandwidth is reasonable, and the allocated bandwidth of the sub-area is not required to be adjusted.
The SDN parent controller may perform actual bandwidth configuration adjustment through an OpenFlow protocol and an ANDSF function.
In one embodiment, the SDN parent controller may determine the priority corresponding to each SDN child controller according to the remaining amount of redundant bandwidth of the SDN child controllers of each sub-region. Then, in the process of adjusting the bandwidths, the SDN father controller can respectively adjust the allocated bandwidths of all the subareas according to the priority of all the subareas and the order of the priority. Wherein, the surplus of redundant bandwidth of subregion and priority are in negative correlation, and the lower the surplus, the higher the corresponding priority.
The higher the priority corresponding to the sub-region, the higher the order of bandwidth adjustment for the sub-region. Under the condition that the adjustable bandwidth of the total area is limited, the allocated bandwidth of the subarea with high priority is adjusted first. There may be a case where the regulatable bandwidth is exhausted and bandwidth cannot be allocated to the sub-region with lower priority.
The criteria for determining the difference between the actual bandwidth used by the network device and the allocated bandwidth in S202 to S204 may be determined according to a preset difference. If the difference is larger than the first preset difference, the difference is larger, and if the difference is smaller than the second preset difference, the difference is smaller. The first preset difference value is greater than or equal to the second preset difference value, and the first preset difference value and the second preset difference value can be the same or different, and specific numerical values can be set according to requirements, so that the application is not limited.
It should be noted that, when the SDN parent controller and the SDN child controller perform bandwidth adjustment on each network device in the wide area network based on a preset trigger condition, a first bandwidth calculation algorithm, a second bandwidth calculation algorithm, and a third bandwidth calculation algorithm are sequentially adopted according to the order of S202 to S204, so that all network devices in the whole wide area network are traversed, and bandwidth corresponding to each network device is calculated and adjusted as required.
In addition, in the process of sequentially adjusting the mobile terminal, the network switching equipment and the SDN sub-controller, if the condition of insufficient adjustable bandwidth exists, the SDN parent controller and the SDN sub-controller can trace back step by step until the SDN master controller. And after the SDN master controller adjusts and distributes the total bandwidth of the whole wide area network, carrying out corresponding bandwidth adjustment on the network equipment of each sub-level downwards.
In the embodiment of the application, through the distributed SDN controller arranged in the wide area network, the whole flow control can be performed on each subarea in the wide area network, and the targeted bandwidth control can be performed on the network equipment in each subarea.
The SDN father controller can regulate and control the bandwidth among all subareas in a large range in the total area range, senses the network pressure among all subareas by collecting the network equipment information of all subareas, and flexibly regulates and controls according to the network pressure so as to ensure the network stability among different subareas in the wide area network.
The SDN sub-controller only needs to process the bandwidth regulation and control of the network equipment in the small range of the current sub-region, so that the performance pressure on the SDN sub-controller is reduced. Meanwhile, the SDN subcontroller uses ANDSF and OpenFlow protocols as actual issuers of configuration and small-range regulators in the subareas, so that operations such as bandwidth regulation and fault detection and the like are realized on each network device in the current subarea, accurate regulation in the small range can be realized, and the timeliness and precision control of regulation are ensured.
The optimization of the mobile network use experience of the mobile terminals in a plurality of subareas can be ensured simultaneously through the bandwidth regulation and control of the network switching equipment and the mobile terminal equipment in the subareas and the large-range regulation and control of the total bandwidth among the subareas. Therefore, bandwidth coordination among network devices in each subarea can be realized, the service quality of a mobile network is improved, and the network robustness is enhanced.
In one embodiment, if the SDN parent controller monitors that the actual bandwidth used by the sub-region is not less than the total bandwidth of the sub-region, it indicates that both the allocated bandwidth and the redundant bandwidth of the sub-region are exhausted. At this time, in order to ensure stable communication of the sub-area, the third bandwidth calculation algorithm may be directly triggered, and the allocated bandwidth of the sub-area is adjusted by the SDN parent controller.
In one embodiment, the mobile terminal may send an access request through an ANDSF pull manner during a process of connecting to the network providing device. The access request comprises mobile terminal information of the mobile terminal, wherein the mobile terminal information comprises a MAC address, a device type and the like of the mobile terminal.
Therefore, the SDN sub-controller may determine, according to the device type and the priority determining rule of the mobile terminal to be connected, the priority and the minimum guaranteed bandwidth corresponding to the mobile terminal to be connected. And then, the SDN subcontroller can calculate and determine the adjustable bandwidth of each network providing device in the connection range of the mobile terminal to be connected according to a first bandwidth calculation algorithm. Then, the SDN sub-controller may determine, from among the network providing devices, a network providing device with an adjustable bandwidth greater than a minimum guaranteed bandwidth of the mobile terminal to be connected as a network providing device matched with the access request of the mobile terminal to be connected. Finally, the SDN sub-controller may determine to access the mobile terminal to be connected into the matching network providing device.
If the number of the network providing devices is determined to be matched, the SDN sub-controller can determine the network providing device with the largest controllable bandwidth according to the controllable bandwidth of each network providing device, and the network providing device with the largest controllable bandwidth is used as an access object of the mobile terminal to be connected.
Therefore, the network providing equipment accessed by the mobile terminal to be connected can be ensured to have sufficient adjustable bandwidth, so that the allocated bandwidth of each mobile terminal can be adjusted and controlled at any time according to the actual flow change condition of the mobile terminal network equipment.
In one embodiment, the SDN sub-controller may determine mobile terminal information for all accessed mobile terminals within the current sub-area and store the mobile terminal information in a database. The mobile terminal information further comprises access time, access network providing equipment, priority and the like.
In one embodiment, when the mobile terminal to be connected is accessed to the matched network providing device, the SDN sub-controller may determine whether mobile terminal information matched with the MAC address exists in the database according to the MAC address of the mobile terminal to be connected.
If the matched mobile terminal information exists in the database, which means that the mobile terminal to be connected is accessed into the wide area network, the SDN subcontroller can directly adopt the content in the mobile terminal information stored in the database, including the priority of the mobile terminal, so as to save the recalculation time of the information such as the priority of the mobile terminal to be connected, and the like, thereby being convenient and quick.
In one embodiment, the SDN sub-controller may determine, according to a preset timeout period, that the mobile terminal has not been connected to the current wan within the timeout period, and delete the mobile terminal information stored in the database, so as to save storage space.
In one embodiment, if the mobile terminal to be connected requests access, but there is no network providing device matched with the mobile terminal to be connected, the SDN sub-controller may determine the mobile terminal with low activity from all the mobile terminals connected to the network providing device, and reduce the allocated bandwidth according to the actual bandwidth of the mobile terminal with low activity, so as to increase the adjustable bandwidth of the network providing device.
Then, the SDN sub-controller may determine, based on the increased adjustable bandwidth of the network providing device, whether there is a network providing device matching the mobile terminal to be connected, again according to the first bandwidth calculation algorithm. If the matched network providing equipment exists, the mobile terminal to be connected can be accessed. If no network providing device matched with the mobile terminal to be connected exists, the network providing device in the connection range of the mobile terminal to be connected does not exist enough adjustable bandwidth. The SDN sub-controller may reject the corresponding access request until there is a matching network providing device in order to guarantee the communication quality of the mobile terminal to be connected access.
Fig. 3 is a flowchart of another mobile network optimization method based on a distributed SDN according to an embodiment of the present application.
As shown in fig. 3, when the triggering mode is that a preset inspection period set by the SDN parent controller is reached, or network switching equipment is added or deleted, or an SDN sub-controller is added or reduced, the SDN sub-controller performs bandwidth load calculation on each mobile terminal according to a first bandwidth calculation algorithm. And triggering a second bandwidth calculation algorithm after the calculation is completed, and carrying out bandwidth calculation on each network switching device. After the bandwidth algorithm of the SDN child controller is finished, sending a calculation result to the SDN parent controller, and triggering the SDN parent controller to perform bandwidth calculation on each sub-region through a first bandwidth calculation algorithm. Finally, the SDN father controller adjusts the allocated bandwidth of each sub-area according to the calculation result, and the SDN sub-controller respectively carries out actual configuration issuing on the bandwidth of the network switching equipment and the mobile terminal in the sub-area through OpenFlow and ANDSF according to the adjustment result so as to complete the bandwidth adjustment of the whole mobile network.
When the triggering mode is that the mobile terminal is added, triggering the SDN sub-controller to perform calculation of a first bandwidth calculation algorithm, selecting matched network providing equipment for the mobile terminal to be accessed, and realizing the access of the mobile terminal through an ANDSF function.
When the triggering mode is that the redundant bandwidth of the sub-region is used up, the SDN father controller is directly triggered to calculate a third bandwidth calculation algorithm, and the allocated bandwidth of the sub-region is urgently regulated and controlled. And in the subsequent inspection, the allocated bandwidths of the network switching equipment and the mobile terminal in the subarea are optimized and adjusted again, so that the timeliness of bandwidth adjustment is ensured.
It should be noted that, in the embodiment of the present application, when calculating the actual usage bandwidth (i.e. the actual traffic flow) of the network device, the SDN parent controller and the SDN child controller determine the actual usage bandwidth of the network device through a successive approximation method.
All embodiments in the application are described in a progressive manner, and identical and similar parts of all embodiments are mutually referred, so that each embodiment mainly describes differences from other embodiments. For system embodiments, the description is relatively simple as it is substantially similar to method embodiments, and reference is made to the description of method embodiments for relevant points.
It should also be noted that 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 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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. A mobile network optimization method based on a distributed SDN, comprising:
the SDN child controller acquires network equipment information in the current sub-area, sends the network equipment information to the SDN parent controller and receives relevant information of network equipment issued by the SDN parent controller;
the SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset trigger condition, a first bandwidth calculation algorithm, the total bandwidth of the current network providing equipment, the actual use bandwidth and the allocated bandwidth of the mobile terminal accessed by the current network providing equipment;
the SDN sub-controller adjusts the allocated bandwidth of each network switching device in the current subarea according to the second bandwidth calculation algorithm, the total bandwidth of the current subarea, the actual use bandwidth and the allocated bandwidth of each network switching device in the current subarea;
The SDN father controller adjusts the allocated bandwidth of each SDN sub-controller according to the third bandwidth calculation algorithm, the total bandwidth of the total area, and the actual use bandwidth, the allocated bandwidth and the redundant bandwidth of the SDN sub-controller corresponding to each sub-area in the total area;
the method specifically includes the steps of adjusting the allocated bandwidth of each mobile terminal according to a first bandwidth calculation algorithm, the total bandwidth of the current network providing device, the actual use bandwidth and the allocated bandwidth of the mobile terminal accessed by the current network providing device, and the method specifically includes:
and determining whether the allocated bandwidth of each mobile terminal needs to be adjusted according to the difference value between the actual use bandwidth and the allocated bandwidth of the mobile terminal accessed by the current network providing device, so as to calculate the adjustable bandwidth obtained by the difference value between the total bandwidth of the current network providing device and the allocated bandwidth of the mobile terminal accessed by the current network providing device according to the first bandwidth calculation algorithm under the condition that adjustment is needed, and adjust the allocated bandwidth of each mobile terminal.
2. The method of claim 1, wherein adjusting the allocated bandwidth for each mobile terminal comprises:
Determining the priority corresponding to each mobile terminal according to the equipment type of each mobile terminal;
and respectively adjusting the allocated bandwidths of the mobile terminals in sequence according to the priorities of the mobile terminals.
3. The method of claim 1, wherein adjusting the allocated bandwidth of each network switching device within the current sub-area comprises:
determining the priority corresponding to each network switching device according to the minimum guaranteed bandwidth of each network switching device in the current subarea; wherein, the minimum guaranteed bandwidth and the priority form a positive correlation;
and respectively adjusting the allocated bandwidths of the network switching devices in the current subarea according to the priority of the network switching devices in sequence.
4. The method of claim 1, wherein adjusting the allocated bandwidth of each SDN sub-controller comprises:
determining the priority of the sub-region corresponding to each SDN sub-controller according to the residual quantity of the redundant bandwidth of each SDN sub-controller;
and respectively adjusting the allocated bandwidths of the SDN sub-controllers in sequence according to the priorities of the sub-regions.
5. The method of claim 1, wherein the preset trigger condition comprises: reaching a preset inspection period; or the addition or deletion of SDN subcontrollers exists; or there may be an addition or deletion of network switching devices.
6. The method according to claim 1, wherein the method further comprises:
and when the actual used bandwidth of the subarea is not smaller than the sum of the allocated bandwidth and the redundant bandwidth, triggering a third bandwidth calculation algorithm, and adjusting the allocated bandwidth of the subarea.
7. The method according to claim 1, wherein the method further comprises:
according to an access request of a mobile terminal to be connected and the first bandwidth calculation algorithm, determining network providing equipment matched with the access request; the access request comprises mobile terminal information of the mobile terminal to be connected;
and accessing the mobile terminal to be connected to the matched network providing equipment.
8. The method of claim 7, wherein the method further comprises:
if no network providing equipment matched with the access request exists, determining the mobile terminal with low activity from all connected mobile terminals, and adjusting the allocated bandwidth of the mobile terminal with low activity; the low activity level indicates that the difference between the actual use bandwidth and the allocated bandwidth of the mobile terminal is larger than a first preset threshold value, and the network peak value change is smaller than a second preset threshold value in a preset time period;
Determining network providing equipment matched with the access request according to the first bandwidth calculation algorithm again;
and rejecting the access request if the network providing equipment matched with the access request does not exist.
9. The method according to claim 7, wherein accessing the mobile terminal to be connected to the matched network providing device comprises:
determining whether mobile terminal information matched with the MAC address exists in a database according to the MAC address of the mobile terminal to be connected;
and if the matched mobile terminal information exists, determining to continue adopting the content of the matched mobile terminal information.
10. A mobile network optimization system based on a distributed SDN, comprising:
SDN subcontroller, set up in each subregion, connect with network switching equipment, is used for summarizing the network equipment information of the present subregion, and based on the triggering condition of presetting, according to the first bandwidth calculation algorithm, adjust the assigned bandwidth of each mobile terminal in the present subregion, according to the second bandwidth calculation algorithm, adjust the assigned bandwidth of each network switching equipment in the present subregion;
The SDN father controller is connected with each SDN sub-controller, and is used for acquiring network equipment information from each SDN sub-controller and adjusting the allocated bandwidth of each sub-area according to a third bandwidth calculation algorithm;
the network switching equipment is connected with the corresponding SDN sub-controller and the network providing equipment and is used for collecting own network equipment information and sending the network equipment information to the corresponding SDN sub-controller;
the network providing device is connected with the corresponding network switching device and the mobile terminal and is used for collecting network device information of the connected mobile terminal and sending the network device information to the corresponding SDN sub-controller;
the mobile terminal is used for establishing connection with the matched network providing equipment according to the instruction of the SDN subcontroller;
the interaction device is connected with the SDN sub-controller and the SDN father controller and is used for displaying network device information and sending instructions to the SDN sub-controller and the SDN father controller based on user operation so as to modify the network device information;
the method for adjusting the allocated bandwidth of each mobile terminal in the current subarea according to the first bandwidth calculation algorithm specifically comprises the following steps:
and determining whether the allocated bandwidth of each mobile terminal needs to be adjusted according to the difference value between the actual use bandwidth and the allocated bandwidth of the mobile terminal accessed by the current network providing device, so as to calculate the adjustable bandwidth obtained by the difference value between the total bandwidth of the current network providing device and the allocated bandwidth of the mobile terminal accessed by the current network providing device according to the first bandwidth calculation algorithm under the condition that the adjustment is needed, and adjusting the allocated bandwidth of each mobile terminal.
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| CN112887138A (en) * | 2021-01-25 | 2021-06-01 | 绍兴文理学院元培学院 | Network equipment adding method, system, terminal and storage medium |
| CN112887412B (en) * | 2021-02-01 | 2023-01-17 | 国网安徽省电力有限公司淮南供电公司 | Distributed network control system and control method based on SDN and edge computing technology |
| CN115695200A (en) * | 2021-07-28 | 2023-02-03 | 华为技术有限公司 | Bandwidth allocation method, device and system |
| CN113572650A (en) * | 2021-08-18 | 2021-10-29 | 浪潮思科网络科技有限公司 | Network regulation and control method, equipment and medium based on SDN |
| CN114070758B (en) * | 2021-12-20 | 2023-07-18 | 重庆邮电大学 | SDN network-based flow table optimization method and device |
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