CN111918314A - 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 (software defined network), which are used for solving the problems that the network quality and stability are influenced due to uneven distribution and unbalanced load of mobile network resources. The SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset triggering condition, a first bandwidth calculation algorithm, the total bandwidth of the current network providing equipment, the actual use bandwidth of the accessed mobile terminal and the allocated bandwidth; the SDN sub-controller adjusts the allocated bandwidth of each network switching device in the current sub-area according to the second bandwidth calculation algorithm, the total bandwidth of the current sub-area, and the actual used bandwidth and the allocated bandwidth of each network switching device in the current sub-area; and the SDN parent controller adjusts the allocated bandwidth of each SDN sub-controller according to a 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 application 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 mobile internet and the high-speed increase of the number of mobile terminals, the data that the cellular network needs to carry increases exponentially.
At present, under the scene with a large number of mobile terminals, schemes with high bandwidth, gradual deployment and low cost, such as WiFi access points and relay nodes, are generally adopted to solve the problems of unsmooth communication and the like caused by data overload.
And the mobile terminal can realize certain data management and control functions by accessing A 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 on the network side, and in some cases, the problem of uneven distribution of mobile network resources exists, which may cause load imbalance, network instability, and other situations, and may affect the user experience.
Especially, in some high-load scenes, such as a stadium, a business district, a smart city, and the like, in a wide area network range where terminals are densely distributed, a problem of load imbalance still exists in a mobile network provided through WiFi, and adverse effects are generated on network quality.
Disclosure of Invention
The embodiment of the application provides a mobile network optimization method and system based on a distributed SDN (software defined network), which are used for solving the problems that the network quality and the network stability are influenced due to uneven distribution and unbalanced load of mobile network resources.
The mobile network optimization method based on the distributed SDN comprises the following steps:
the SDN sub-controller acquires network equipment information in a current sub-area, sends the network equipment information to the SDN parent controller, and receives related information of the network equipment released by the SDN parent controller;
the SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset triggering 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 sub-area according to the second bandwidth calculation algorithm, the total bandwidth of the current sub-area, and the actual used bandwidth and the allocated bandwidth of each network switching device in the current sub-area;
and the SDN parent controller adjusts the allocated bandwidth of each SDN sub-controller according to a 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 of each mobile terminal includes: determining the corresponding priority of each mobile terminal according to the equipment type of each mobile terminal; and respectively adjusting the allocated bandwidth of each mobile terminal in sequence according to the priority of each mobile terminal.
In one example, adjusting the allocated bandwidth of each network switching device in the current sub-region includes: determining the priority corresponding to each network switching device according to the minimum guaranteed bandwidth of each network switching device in the current sub-area; wherein, the minimum guaranteed bandwidth and the priority level form a positive correlation; and respectively adjusting the allocated bandwidth of each network switching device in the current subregion according to the priority of each network switching device in sequence.
In one example, adjusting the allocated bandwidth of each SDN controller includes: determining the priority of a sub-area corresponding to each SDN sub-controller according to the surplus of the redundant bandwidth of each SDN sub-controller; and respectively adjusting the allocated bandwidth of each SDN sub-controller in sequence according to the priority of each sub-region.
In one example, the preset trigger condition includes: reaching a preset polling period; there is an addition or deletion of SDN controllers; there is an addition or deletion of a network switching device.
In one example, the method further comprises: and triggering a third bandwidth calculation algorithm to adjust the allocated bandwidth of the sub-area when the actual used bandwidth of the sub-area is determined to be not less than the sum of the allocated bandwidth and the redundant bandwidth.
In one example, the method further comprises: determining network providing equipment matched with an access request according to the access request of a mobile terminal to be connected and the first bandwidth calculation algorithm; the access request comprises the 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 the network providing equipment matched with the access request does not exist, determining the mobile terminal with low activity level from all connected mobile terminals, and adjusting the allocated bandwidth of the mobile terminal with low activity level; the low activity indicates that the difference between the actually used bandwidth and the allocated bandwidth of the mobile terminal is greater than a first preset threshold, and the change of the network peak value is less than a second preset threshold within a preset time period; determining the network providing equipment matched with the access request according to the first bandwidth calculation algorithm; and if the network providing equipment matched with the access request does not exist, rejecting the access request.
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 or not according to the MAC address of the mobile terminal to be connected; and if the matched mobile terminal information exists, determining to continuously adopt the content of the matched mobile terminal information.
An embodiment of the present application provides a mobile network optimization system based on a distributed SDN, including:
the SDN sub-controllers are arranged in the sub-areas, connected with the network switching equipment and used for summarizing the network equipment information of the current sub-area, adjusting the allocated bandwidth of each mobile terminal in the current sub-area according to a first bandwidth calculation algorithm based on a preset trigger condition, and adjusting the allocated bandwidth of each network switching equipment in the current sub-area according to a second bandwidth calculation algorithm;
the SDN parent controller is connected with each SDN sub-controller and 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-controllers and the network providing equipment, and is used for acquiring the information of the network equipment per se and sending the information to the corresponding SDN sub-controllers;
the network providing equipment is connected with the corresponding network switching equipment and the mobile terminal, and is used for acquiring network equipment information of the connected mobile terminal and sending the network equipment 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 controller;
and the interaction device is connected with the SDN sub-controller and the SDN parent controller, and is used for displaying network device information and sending instructions to the SDN sub-controller and the SDN parent controller based on the operation of a user 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 have the following beneficial effects:
by the aid of the SDN controllers deployed in a distributed mode, overall flow control can be performed on each subarea in a wide area network, and targeted bandwidth control can be performed on network equipment in each subarea. Therefore, the data processing pressure of the SDN sub-controllers among the sub-areas can be reduced, and the problems of time delay and bandwidth occupation caused by more network equipment and larger data transmission quantity when large-scale areas such as a wide area network are managed are solved.
The SDN parent controller can regulate and control the bandwidth among the sub-areas in a large range in a total area range, and senses the network pressure among the sub-areas by collecting the network equipment information of the sub-areas, so that the network stability among different sub-areas in a wide area network is ensured.
The SDN sub-controllers only need to process bandwidth regulation and control of network equipment in a small range of the current sub-area, and performance pressure on the SDN sub-controllers is reduced. Meanwhile, the SDN sub-controller uses the ANDSF and the OpenFlow protocol as an actual configured distributor and a small-range regulator in a sub-area, and realizes bandwidth regulation, fault detection and other operations on each network device in the current sub-area, so that accurate regulation in the small-range can be realized, and the instantaneity and accuracy control of the regulation can be guaranteed.
By regulating and controlling the bandwidth of the network switching equipment and the mobile terminal equipment in the sub-areas and regulating and controlling the total bandwidth among the sub-areas in a large range, the optimization of the use experience of the mobile network of the mobile terminal in a plurality of sub-areas can be ensured at the same time. Therefore, the coordination of bandwidth among the network equipment among the sub-areas can be realized, the service quality of the 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 embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a mobile network optimization system based on a distributed SDN according to an embodiment of the present application;
fig. 2 is a flowchart of a mobile network optimization method based on a distributed SDN according to 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
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of a mobile network optimization system based on a distributed SDN according to an embodiment of the present application, where the system mainly includes an SDN parent controller 1, an SDN sub-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 a general area, and an SDN parent controller 1 is arranged in the wide area network. The total area comprises a plurality of sub-areas A-N, each sub-area is provided with an SDN sub-controller 2, and the SDN sub-controllers 2 are connected with all the network switching devices 3 in the current sub-area. Each network switching device 3 is connected to a corresponding network providing device 4, and each network providing device 4 has access to a number of mobile terminals 5.
The SDN parent controller 1 is disposed in the whole wide area network, and is configured to acquire network device information between the sub-areas and receive network device information in the corresponding sub-area from the SDN sub-controller 2. The SDN parent 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 device comprises an SDN sub-controller, a network switching device, a network providing device, a mobile terminal and the like, and the network device information comprises information such as a topological structure, bandwidth and load.
The SDN sub-controllers 2 are arranged in each sub-area and connected with the SDN parent controller 1. The SDN sub-controller 2 is used for acquiring and summarizing network device information of all network devices in the current sub-area, and sending the network device information to the SDN parent controller. And, the SDN controller may also send all network device information to the interaction device 7 for display.
The SDN sub-controller is further used for managing the network switching equipment supporting the OpenFlow protocol through the OpenFlow protocol and according to a flow table mode, and completing actual configuration issuing so as to realize bandwidth regulation and control of a network switching equipment port. And the SDN sub-controller is also used for reasonably distributing the bandwidth of the mobile terminal in the current sub-area and selecting a proper 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 itself, send the network topology information, the bandwidth information, and the like to the SDN sub-controller, and adjust the bandwidth information of itself 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 with the corresponding network switching device 3, and is also connected with a plurality of mobile terminals for providing wireless network services for the mobile terminals. The network providing equipment can collect network topology information, bandwidth information, mobile terminal information and the like of the accessed mobile terminal and send the information to the SDN sub-controller. Wherein the network providing device comprises a home router or the like
The mobile terminal 5 is configured to determine an access network providing device through an access network discovery and selection function ANDSF under the control of the SDN controller.
The database 6 is in communication with the SDN parent controller and the SDN sub-controller, and can store network topology information, bandwidth information, mobile terminal information and the like of each network device in the system, which are acquired by the SDN parent controller and the SDN sub-controller
The interaction device 7 communicates with the SDN parent controller and the SDN sub-controller. The interaction device comprises an SDN parent controller interaction interface, an SDN sub-controller network exchange device interaction interface and an SDN sub-controller mobile terminal interaction interface.
The SDN parent controller interaction interface can display network equipment information of each SDN sub-controller, bandwidth information of each sub-area, topological information of each sub-area and priority, and can determine the minimum guaranteed bandwidth and the minimum redundant bandwidth set for each sub-area based on the operation of a user. The SDN sub-controller network switching equipment interaction interface can display bandwidth information, topology information and priority of each network switching equipment in the current sub-area, and can set or modify the minimum guaranteed bandwidth and priority of each network switching equipment based on the operation of a user. The SDN sub-controller mobile terminal interactive interface can display bandwidth information, mobile terminal information, bandwidth information and priority of each network providing device in the current sub-area, and can set or modify the minimum guaranteed bandwidth, priority and priority determination rule of each mobile terminal based on user operation.
In the embodiment of the application, through the distributed deployed SDN parent controller and the SDN sub-controllers, the SDN parent controller performs overall control on a total area corresponding to a wide area network, and the SDN sub-controllers respectively perform control on sub-areas administered by the total area. Therefore, the data processing pressure of the SDN sub-controllers among the sub-areas can be reduced, and the problems of time delay and bandwidth occupation caused by more network equipment and larger data transmission quantity when large-scale areas such as a wide area network are managed are solved.
Compared with a mobile network provided by the traditional WiFi technology, the system can coordinate the load pressure among the sub-areas, realize the bandwidth regulation and control in the wide area network range and improve the overall network quality in the total area. Meanwhile, compared with the problems of uneven load distribution and the like caused by centralized use of the mobile terminals in the traditional WLAN, the system can perform targeted regulation and control on the bandwidth of each mobile terminal, determine accessible network providing equipment for the mobile terminals according to the load condition of the network providing equipment, and can enhance the robustness of the network.
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 the other SDN parent controllers serve as standby controllers. When the SDN parent controller playing a main role has abnormal conditions such as failure and damage, other SDN parent controllers can be started to ensure that the system can normally run, 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 according to an embodiment of the present application, which specifically includes the following steps:
s201: and the SDN sub-controller acquires the information of the network equipment in the current sub-area, sends the information to the SDN parent controller and receives the related information of the network equipment released by the SDN parent controller.
In the embodiment of the application, the SDN sub-controllers in each sub-area may acquire information of all network devices in the current sub-area and send the information to the SDN parent controller. And the SDN sub-controller may receive the relevant information of the network device between the sub-areas, which is issued 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 polling period, preset minimum guaranteed bandwidth of each network equipment, priority and the like.
S202: and the SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset triggering condition and a first bandwidth calculation algorithm, the total bandwidth of the current network providing equipment, the actual use bandwidth of the mobile terminal accessed by the current network providing equipment and the allocated bandwidth.
In this embodiment of the application, the SDN parent controller and the SDN sub-controller may start a bandwidth calculation and control process for each network device based on a preset trigger condition. In the regulation and control process, the mobile terminal, the network switching equipment and the SDN sub-controller are sequentially carried out.
Specifically, the SDN controller may determine the bandwidth allocated to the mobile terminal when the mobile terminal accesses the corresponding network providing device, and a numerical value of the bandwidth allocated to the mobile terminal is a bandwidth upper limit of the mobile terminal in a bandwidth using process.
In the bandwidth regulation and control process, the SDN controller may determine, based on a first bandwidth calculation algorithm, an adjustable and controllable bandwidth corresponding to a current network providing device according to a total bandwidth of the current network providing device to which the mobile terminal is accessed and allocated bandwidths of all mobile terminals to which the current network providing device is accessed. Then, the SDN controller may adjust the allocated bandwidth of each mobile terminal according to the actual used bandwidth and the allocated bandwidth of the mobile terminal, and the adjustable bandwidth corresponding to the current network providing device. The adjustable bandwidth means 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 represented as: sr＝Sab-SmbWherein S isrIndicating the controllable bandwidth of a network providing device, SabRepresenting the total bandwidth of the network providing device, SmbIndicating that the network provides access to the deviceThere is a sum of the allocated bandwidths of the mobile terminals.
For all mobile terminals to which the network provides device access, the SDN controller may determine whether the allocated bandwidth of the mobile terminal needs to be adjusted according to a difference between an actually used bandwidth of the mobile terminal and the allocated bandwidth.
If the difference between the actually used bandwidth of the mobile terminal and the allocated bandwidth is small, it indicates that the actually used bandwidth required to be used by the mobile terminal is large, and the currently allocated bandwidth is likely to be broken through, then the currently allocated bandwidth is not sufficient, and the bandwidth requirement of the mobile terminal may not be met. Therefore, under the condition that the adjustable bandwidth of the network providing device is sufficient, the SDN controller can improve the allocated bandwidth of the mobile terminal, and allocate more bandwidth to the mobile terminal, so as to ensure 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 actually used bandwidth and the allocated bandwidth of the mobile terminal is large, it indicates that the allocated bandwidth allocated to the mobile terminal is enough to be used currently, and the currently allocated bandwidth is reasonable and meets the actual requirement, then the allocated bandwidth of the mobile terminal does not need to be adjusted.
In one embodiment, the preset trigger condition may include:
(1) and reaching the preset polling period. And the SDN sub-controllers can automatically calculate and regulate and control the bandwidth of the network equipment of each sub-area when reaching the preset patrol cycle according to the preset patrol cycle in the SDN parent controller. Wherein, predetermine and patrol and examine the cycle and can set up as required, this application does not limit to this.
(2) There is an addition or deletion of SDN controllers (i.e., sub-regions). When an newly added SDN sub-controller is arranged in the system, and after the newly added SDN sub-controller completes parameter configuration, or an SDN sub-controller is deleted, each existing SDN sub-controller can 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 a network switching device. When a new network switching device is added to the sub-area or the network switching device is deleted, the SDN parent controller may recalculate and regulate the bandwidth of the network device in each sub-area.
In one embodiment, the SDN controller may determine the priority of the mobile terminal according to a certain priority determination rule, and perform bandwidth control on the mobile terminal according to the priority.
In one possible implementation, the priority determination rule may be a correspondence between a device type and a priority. Therefore, the SDN controller may determine the priority corresponding to the mobile terminal according to the device type of the mobile terminal accessed in the current sub-area. Then, in the process of adjusting the bandwidth, the SDN controller may respectively adjust the allocated bandwidth of each mobile terminal according to the priority of each mobile terminal accessed by the network providing device and according to the order of the priority. The device types of the mobile terminal include a smart phone, a tablet computer, an intelligent computing device and the like, and the priority corresponding to each device type can be set according to business needs, which is not limited in the present application.
The higher the priority corresponding to the mobile terminal is, the higher the order of adjusting the bandwidth of the mobile terminal is. Under the condition that the adjustable bandwidth of the network providing equipment is limited, the allocated bandwidth is firstly adjusted for the mobile terminal with high priority. There may be a situation where the regulatable bandwidth is exhausted and no more bandwidth can be allocated to the mobile terminal with the lower priority.
In one embodiment, the SDN controller may set a corresponding minimum guaranteed bandwidth for the mobile terminal according to a 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 one embodiment, during the process of adjusting the allocated bandwidth of the mobile terminal, the SDN controller may determine that a difference between an actually used bandwidth of the mobile terminal and the allocated bandwidth is greater than a first preset threshold, and when a network peak value change is smaller than a second preset threshold within a preset time period, consider that the activity of the mobile terminal is low. Therefore, the SDN controller can adjust the allocated bandwidth of the mobile terminal with low activity to a value equal to the actual bandwidth used by the mobile terminal, so as to avoid bandwidth waste and provide bandwidth utilization. The first preset threshold, the preset time period and the second preset threshold can be set as required, and the setting is not limited in the application.
In one embodiment, the SDN controller can determine the priority for the mobile terminal according to the priority range of-1 to 64, wherein the higher the value is, the higher the priority is. In the default state, the priority of the mobile terminal is 1, and at this time, the default mobile terminal does not have the minimum guaranteed bandwidth. And when the activity of the mobile terminal is low, setting the priority of the mobile terminal to be 0. When the required flow of the mobile terminal is larger than the total bandwidth of the network providing equipment accessed by the mobile terminal, the priority of the mobile terminal is set to-1, and the bandwidth is not allocated to the mobile terminal.
S203: and the SDN sub-controller adjusts the allocated bandwidth of each network switching device in the current sub-area according to the second bandwidth calculation algorithm, the total bandwidth of the current sub-area, and the actual used bandwidth and the allocated bandwidth of each network switching device in the current sub-area.
In this embodiment of the application, the SDN 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 allocated resources of all network switching devices in the current sub-area. Then, the SDN 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 adjustable bandwidth represents the bandwidth which is owned by the current sub-area and is not allocated yet, and can be freely allocated to the subordinate network switching equipment.
Specifically, the second bandwidth calculation algorithm may be represented as: siaab＝Saab-SkbWherein S isiaabControllable bandwidth, S, representing sub-regionsaabRepresenting the total bandwidth of the sub-region, SkbRepresenting all of the current sub-regionThe sum of the allocated bandwidths of the network switching devices.
For all network switching devices in a sub-area, the SDN controller may determine whether the allocated bandwidth of the network switching device needs to be adjusted according to a difference between an actually used bandwidth of the network switching device and the allocated bandwidth.
If the difference between the actually used bandwidth and the allocated bandwidth of the network switching device is small, it indicates that the actually used bandwidth that the network switching device needs to use is large, and it is likely to break through the currently allocated bandwidth, then the currently allocated bandwidth is not sufficient, and the bandwidth requirement of the network switching device may not be met. Therefore, under the condition that the adjustable bandwidth of the current sub-area is sufficient, the SDN controller may increase the allocated bandwidth of the network switching device, and allocate more bandwidth to the network switching device, so as to ensure normal communication of the network switching device.
The SDN sub-controller can issue a flow table to the network switching device supporting the protocol through an OpenFlow protocol, so as to adjust the bandwidth of the network switching device.
If the difference between the actually used bandwidth and the allocated bandwidth of the network switching device is large, it indicates that the allocated bandwidth allocated to the network switching device is enough to be used currently, and the setting of the currently allocated bandwidth is reasonable and meets the actual requirement, then the allocated bandwidth of the network switching device does not need to be adjusted.
In one embodiment, the SDN controller may set a minimum guaranteed bandwidth for each network switching device connected. The minimum guaranteed bandwidth represents a minimum value of bandwidth allocated to the network switching device, and the allocated bandwidth corresponding to the network switching device must be greater than the minimum guaranteed bandwidth.
The second bandwidth calculation algorithm can then be expressed as: siaab＝Saab-Shb-SdbWherein S isiaabControllable bandwidth, S, representing sub-regionsaabRepresenting the total bandwidth of the sub-region, ShbMinimum guaranteed bandwidth sum, S, of network switching devices representing non-default priorities in the current sub-areadbTo representThe sum of the allocated bandwidths of the network switching devices of the default priority within the current sub-region.
In one embodiment, the SDN controller may determine the priority corresponding to each network switching device according to the minimum guaranteed bandwidth of each network switching device in the current sub-area. And then, in the process of adjusting the bandwidth, the SDN controller may respectively adjust the allocated bandwidth of each network switching device according to the priority of each network switching device in the current sub-area and the order of the priority. The minimum guaranteed bandwidth of the network switching equipment is in positive correlation with the priority, and the larger the numerical value of the minimum guaranteed bandwidth is, the higher the corresponding priority is.
The higher the priority corresponding to the network switching device is, the earlier the bandwidth adjustment order for the network switching device is. Under the condition that the adjustable bandwidth of the current sub-area is limited, the allocated bandwidth is firstly adjusted for the network switching equipment with high priority. There may be a situation where the regulatable bandwidth is exhausted and no additional bandwidth can be allocated to the network switching device with the lower priority.
In one embodiment, the SDN sub-controllers may determine the 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 the 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 controller may set the upper bandwidth limit of the network switching device port to 0, that is, not allocate bandwidth to the network switching device.
S204: and the SDN parent controller adjusts the allocated bandwidth of each sub-area according to a 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 that are preset for the SDN sub-controllers corresponding to the sub-regions in the total region. The minimum guaranteed bandwidth represents the minimum value of bandwidth allocated to 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 additionally reserved for each subarea besides the allocated bandwidth, is used for dealing with the situation that the bandwidth demand in the subarea is suddenly increased and the like, can be allocated to the network equipment in the current subarea by the SDN sub-controller, and is a safety measure. If the actual used bandwidth in the sub-area reaches the value of the allocated bandwidth and more bandwidth is needed, the SDN controller may continue to occupy the corresponding bandwidth in the range of the redundant bandwidth.
In the bandwidth regulation and control process, the SDN master controller may determine, based on a third bandwidth calculation algorithm, an adjustable bandwidth corresponding to the total area according to the total bandwidth of the total area, and the allocated bandwidth and the redundant bandwidth of each sub-area. And then, the SDN master controller can adjust the allocated bandwidth of each sub-area according to the actual used bandwidth, the minimum guaranteed bandwidth and the redundant bandwidth of each sub-area and the adjustable bandwidth corresponding to the total area. The adjustable bandwidth represents the bandwidth which is not allocated and corresponds to the total area, and can be freely allocated to each sub-area.
Specifically, the third bandwidth calculation algorithm may be represented as: staab＝Srtb-Sfb-SrsbWherein S istaabControllable bandwidth, S, representing total areartbRepresenting the total bandwidth of the total area, SfbRepresenting the sum of the minimum guaranteed bandwidths, S, of the sub-regionsrsbRepresenting the sum of the redundant bandwidths of the sub-regions. And, Saab＝Srb+SsbWherein S isaabRepresenting the total bandwidth of the sub-region, SrbIndicating the allocated bandwidth of the sub-region, SsbRepresenting the redundant bandwidth of the sub-region.
For each sub-region, the SDN parent controller may determine whether the allocated bandwidth of the sub-region needs to be adjusted according to a difference between an actual used bandwidth and a total bandwidth of each sub-region.
If the difference between the actual used bandwidth of the sub-area and the total bandwidth is small, it indicates that the actual used bandwidth required to be used by the corresponding SDN sub-controller is large, and the current allocated bandwidth is likely to be broken through, the current allocated bandwidth is not sufficient, 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 increase the allocated bandwidth of the sub-area, and allocate more bandwidth to the sub-area, so as to ensure normal communication of the SDN sub-controllers.
If the difference between the actually used bandwidth of the sub-region and the allocated bandwidth is large, it indicates that the bandwidth allocated to the sub-region is enough to be used currently, and the currently allocated bandwidth is reasonable and meets the actual requirement, then the allocated bandwidth of the sub-region does not need to be adjusted.
The SDN parent controller can perform actual bandwidth configuration adjustment through an OpenFlow protocol and an ANDSF function.
In one embodiment, the SDN parent controller may determine a priority corresponding to each SDN controller according to a remaining amount of redundant bandwidth of the SDN controller of each sub-area. Then, in the process of adjusting the bandwidth, the SDN parent controller may adjust the allocated bandwidth of each sub-area according to the priority of each sub-area and the order of the priority. The remaining amount of the redundant bandwidth of the sub-region and the priority have a negative correlation, and the lower the remaining amount is, the higher the corresponding priority is.
It should be noted that the higher the priority corresponding to the sub-regions is, the earlier the order of adjusting the bandwidth of the sub-regions is. Under the condition that the adjustable bandwidth of the total area is limited, the allocated bandwidth of the sub-area with high priority is adjusted first. There may be a situation where the regulatable bandwidth is exhausted and bandwidth cannot be allocated to the sub-area with the lower priority.
The standard for determining the size of the difference between the actually used bandwidth and the allocated bandwidth of the network device 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, the first preset difference value and the second preset difference value can be the same or different, specific numerical values can be set according to needs, and the application does not limit the specific numerical values.
It should be noted that, when the SDN parent controller and the SDN sub-controller adjust the bandwidth of each network device in the wide area network based on a preset trigger condition, according to the sequence from S202 to S204, the first bandwidth calculation algorithm, the second bandwidth calculation algorithm, and the third bandwidth calculation algorithm are sequentially adopted to traverse all network devices in the entire wide area network, so as to calculate and adjust the bandwidth corresponding to each network device as needed.
And in the process of sequentially adjusting the mobile terminal, the network switching device 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 main controller. And after the total bandwidth of the whole wide area network is adjusted and distributed through the SDN master controller, corresponding bandwidth adjustment is performed on network equipment of each sub-level downwards.
In the embodiment of the application, the distributed SDN controller arranged in the wide area network can be used for carrying out overall flow regulation and control on each subarea in the wide area network and carrying out targeted bandwidth regulation and control on network equipment in each subarea.
The SDN parent controller can regulate and control the bandwidth among the sub-areas in a large range in a total area range, and senses the network pressure among the sub-areas by collecting the network equipment information of the sub-areas, so that the network stability among different sub-areas in a wide area network is ensured.
The SDN sub-controllers only need to process bandwidth regulation and control of network equipment in a small range of the current sub-area, and performance pressure on the SDN sub-controllers is reduced. Meanwhile, the SDN sub-controller uses the ANDSF and the OpenFlow protocol as an actual configured distributor and a small-range regulator in a sub-area, and realizes bandwidth regulation, fault detection and other operations on each network device in the current sub-area, so that accurate regulation in the small-range can be realized, and the instantaneity and accuracy control of the regulation can be guaranteed.
By regulating and controlling the bandwidth of the network switching equipment and the mobile terminal equipment in the sub-areas and regulating and controlling the total bandwidth among the sub-areas in a large range, the optimization of the use experience of the mobile network of the mobile terminal in a plurality of sub-areas can be ensured at the same time. Therefore, the coordination of bandwidth among the network equipment among the sub-areas can be realized, the service quality of the mobile network is improved, and the network robustness is enhanced.
In one embodiment, if the SDN parent controller monitors that the actually used bandwidth of a 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 used up. At this time, in order to ensure stable communication of the sub-regions, the third bandwidth calculation algorithm may be directly triggered, and the SDN parent controller adjusts the allocated bandwidth of the sub-regions.
In one embodiment, the mobile terminal may send the access request in an ANDSF pull mode during the process of connecting to the network providing device. The access request includes mobile terminal information of the mobile terminal, and the mobile terminal information includes an MAC address, a device type, and the like of the mobile terminal.
Then, the SDN controller may determine the priority and the minimum guaranteed bandwidth corresponding to the mobile terminal to be connected according to the device type and the priority determination rule of the mobile terminal to be connected. Then, the SDN controller may calculate and determine, according to the first bandwidth calculation algorithm, an adjustable bandwidth of each network providing device within a connection range of the mobile terminal to be connected. Then, the SDN controller may determine, from the network providing devices, a network providing device whose controllable bandwidth is greater than the 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 controller may determine to access the to-be-connected mobile terminal into the matched network provisioning device.
If a plurality of matched network providing devices are determined, the SDN controller may determine, according to the size of the adjustable bandwidth of each network providing device, the network providing device with the largest adjustable bandwidth 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 network equipment of the mobile terminal.
In one embodiment, the SDN controller may determine mobile terminal information for all accessed mobile terminals within the current sub-region and store the mobile terminal information in a database. The mobile terminal information further includes access time, access network providing equipment, priority and the like.
In one embodiment, when the to-be-connected mobile terminal is accessed to the matched network providing device, the SDN controller may determine whether the mobile terminal information matched with the MAC address exists in the database according to the MAC address of the to-be-connected mobile terminal.
If the matched mobile terminal information exists in the database and indicates that the mobile terminal to be connected has been accessed to the wide area network, the SDN sub-controller can directly adopt the content in the mobile terminal information stored in the database, including the priority of the mobile terminal and the like, so as to save the recalculation time of the information such as the priority of the mobile terminal to be connected, and the method is convenient and fast.
In an embodiment, the SDN controller may determine, according to a preset timeout period, that the mobile terminal has not accessed the current wide area network within the timeout period, and delete the mobile terminal information stored in the database, so as to save a storage space.
In one embodiment, if the mobile terminal to be connected requests access, but there is no network providing device matching with the mobile terminal to be connected, the SDN controller may determine a mobile terminal with low activity from all mobile terminals connected to the network providing device, and reduce the allocated bandwidth according to the actually used bandwidth of the mobile terminal with low activity, so as to increase the controllable bandwidth of the network providing device.
Then, the SDN controller may determine, based on the increased adjustable bandwidth of the network providing device, whether a network providing device matching the mobile terminal to be connected exists according to the first bandwidth calculation algorithm again. And if the matched network providing equipment exists, the mobile terminal to be connected can be accessed. If the network providing equipment matched with the mobile terminal to be connected does not exist, the network providing equipment in the connection range of the mobile terminal to be connected is indicated, and the adjustable bandwidth does not exist enough. In order to guarantee the communication quality of the access of the mobile terminal to be connected, the SDN controller may reject the corresponding access request until there is a matching network providing device.
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 routing inspection period set by the SDN parent controller is reached, or a network switching device 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 after the calculation is finished, triggering a second bandwidth calculation algorithm to calculate the bandwidth of each network switching device. After the bandwidth algorithm of the SDN sub-controller is finished, the calculation result is sent to the SDN parent controller, and the SDN parent controller is triggered to perform bandwidth calculation on each sub-area through the first bandwidth calculation algorithm. Finally, the SDN parent controller adjusts the allocated bandwidth of each sub-area according to the calculation result, and the SDN sub-controller respectively performs actual configuration and issuing on the bandwidths of the network switching devices and the mobile terminals in the sub-areas through OpenFlow and ANDSF according to the adjustment result so as to complete bandwidth adjustment of the whole mobile network.
When the triggering mode is the mobile terminal adding mode, the SDN sub-controller is triggered to calculate the first bandwidth calculation algorithm, matched network providing equipment is selected for the mobile terminal to be accessed, and the mobile terminal is accessed through an ANDSF function.
When the triggering mode is that the redundant bandwidth of the sub-region is used up, the SDN parent controller is directly triggered to calculate a third bandwidth calculation algorithm, and emergency control is performed on the allocated bandwidth of the sub-region. And in the subsequent routing inspection, the allocated bandwidth of the network switching equipment and the mobile terminal in the sub-area is optimized and adjusted, so that the timeliness of the bandwidth adjustment is ensured.
It should be noted that, in the embodiment of the present application, when calculating the actual used bandwidth (i.e., the actual service traffic) of the network device, both the SDN parent controller and the SDN sub-controller determine the actual used bandwidth of the network device through a successive approximation method.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. For the system embodiment, since it is basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A mobile network optimization method based on a distributed SDN is characterized by comprising the following steps:
the SDN sub-controller acquires network equipment information in a current sub-area, sends the network equipment information to the SDN parent controller, and receives related information of the network equipment released by the SDN parent controller;
the SDN sub-controller adjusts the allocated bandwidth of each mobile terminal according to a preset triggering 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 sub-area according to the second bandwidth calculation algorithm, the total bandwidth of the current sub-area, and the actual used bandwidth and the allocated bandwidth of each network switching device in the current sub-area;
and the SDN parent controller adjusts the allocated bandwidth of each SDN sub-controller according to a 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.
2. The method of claim 1, wherein adjusting the allocated bandwidth for each mobile terminal comprises:
determining the corresponding priority of each mobile terminal according to the equipment type of each mobile terminal;
and respectively adjusting the allocated bandwidth of each mobile terminal in sequence according to the priority of each mobile terminal.
3. The method of claim 1, wherein adjusting the allocated bandwidth of each network switching device in 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 sub-area; wherein, the minimum guaranteed bandwidth and the priority level form a positive correlation;
and respectively adjusting the allocated bandwidth of each network switching device in the current subregion according to the priority of each network switching device in sequence.
4. The method of claim 1, wherein adjusting the allocated bandwidth of each SDN controller comprises:
determining the priority of a sub-area corresponding to each SDN sub-controller according to the surplus of the redundant bandwidth of each SDN sub-controller;
and respectively adjusting the allocated bandwidth of each SDN sub-controller in sequence according to the priority of each sub-region.
5. The method of claim 1, wherein the preset trigger condition comprises: reaching a preset polling period; there is an addition or deletion of SDN controllers; there is an addition or deletion of a network switching device.
6. The method of claim 1, further comprising:
and triggering a third bandwidth calculation algorithm to adjust the allocated bandwidth of the sub-area when the actual used bandwidth of the sub-area is determined to be not less than the sum of the allocated bandwidth and the redundant bandwidth.
7. The method of claim 1, further comprising:
determining network providing equipment matched with an access request according to the access request of a mobile terminal to be connected and the first bandwidth calculation algorithm; the access request comprises the 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, further comprising:
if the network providing equipment matched with the access request does not exist, determining the mobile terminal with low activity level from all connected mobile terminals, and adjusting the allocated bandwidth of the mobile terminal with low activity level; the low activity indicates that the difference between the actually used bandwidth and the allocated bandwidth of the mobile terminal is greater than a first preset threshold, and the change of the network peak value is less than a second preset threshold within a preset time period;
determining the network providing equipment matched with the access request according to the first bandwidth calculation algorithm;
and if the network providing equipment matched with the access request does not exist, rejecting the access request.
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 or not according to the MAC address of the mobile terminal to be connected;
and if the matched mobile terminal information exists, determining to continuously adopt the content of the matched mobile terminal information.
10. A mobile network optimization system based on a distributed SDN (software defined network), comprising:
the SDN sub-controllers are arranged in the sub-areas, connected with the network switching equipment and used for summarizing the network equipment information of the current sub-area, adjusting the allocated bandwidth of each mobile terminal in the current sub-area according to a first bandwidth calculation algorithm based on a preset trigger condition, and adjusting the allocated bandwidth of each network switching equipment in the current sub-area according to a second bandwidth calculation algorithm;
the SDN parent controller is connected with each SDN sub-controller and 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-controllers and the network providing equipment, and is used for acquiring the information of the network equipment per se and sending the information to the corresponding SDN sub-controllers;
the network providing equipment is connected with the corresponding network switching equipment and the mobile terminal, and is used for acquiring network equipment information of the connected mobile terminal and sending the network equipment 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 controller;
and the interaction device is connected with the SDN sub-controller and the SDN parent controller, and is used for displaying network device information and sending instructions to the SDN sub-controller and the SDN parent controller based on the operation of a user so as to modify the network device information.
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