CN114584468A - Multidimensional resource-oriented network dynamic slicing method - Google Patents
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Abstract
A network dynamic slicing method facing multidimensional resources comprises the following steps: the controller obtains topology information, resource information and service information of the multidimensional resource network in the network layer through a southbound interface and a protocol; the controller sends the topology information, the resource information and the service information to a slice application layer through a northbound interface; the slice application establishes a connection relation among the multi-dimensional resources according to the topology information and the resource information, and establishes a multi-dimensional resource pool according to the connection relation; the slice application judges new services with different resource requirements in the network according to the received service information, and calls required resources matched with the new services from a resource pool to establish corresponding multidimensional resource network slices; the slice application sends the slices to a controller through a northbound interface; the controller translates the multidimensional resource network slice into first equipment configuration information, and issues the first equipment configuration information to equipment in a corresponding network layer through the southbound interface so as to realize multidimensional resource network slice deployment.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a network dynamic slicing method for multidimensional resources.
Background
With the synchronous development of cloud computing, IP exchange and optical transmission technologies, the concept of network resources is expanded from single transmission resources to multidimensional resources including cloud computing, cloud storage and transmission resources. Meanwhile, the demand of the user service for each resource may dynamically change with time.
The Network Slicing technology (Network Slicing) can meet diversified requirements of clients on Network resources through resource isolation and resource allocation, for example, a Network Slicing scheme based on a single resource: when a new service request arrives, the controller isolates and allocates a network resource, such as an optical spectrum resource, according to the service requirement, to form a network slice of a single resource, thereby implementing the on-demand allocation of the single network resource, as shown in fig. 1. A single resource network slice may satisfy the requirement of a service for one network resource, but when the service itself needs multiple network resources, the single resource network slice may not satisfy the isolation and allocation requirements of the multiple resources. If only one resource in the network is allocated in a slicing mode, the resource can be efficiently allocated, but other network resources which are not allocated in a slicing mode in the network are difficult to be effectively utilized. As network load increases, these underutilizing network resources can limit the overall carrying capacity of the network. It can be seen that a network resource can be flexibly allocated by a network slicing scheme based on a single resource, but a current network Service often needs multiple network resources at the same time, the scheme ignores the multidimensional resource requirement of the Service and the linkage between the multidimensional resources, and the scheme cannot effectively improve the network carrying capacity and the network Service Quality (QoS) in the face of the mixed requirement of a user on cloud resources and network transmission resources.
Disclosure of Invention
In view of this, the present invention provides a multidimensional resource-oriented network dynamic slicing method capable of meeting the requirements of users on mixed resources.
A network dynamic slicing method facing multidimensional resources comprises the following steps:
at the control layer, the controller obtains topology information, resource information and service information of the multidimensional resource network in the network layer through a southward interface and a protocol;
at the control layer, the controller sends the topology information, the resource information and the service information to the slice application layer through a northbound interface;
in the slice application layer, the slice application establishes a connection relation between the multidimensional resources according to the topology information and the resource information, and establishes a multidimensional resource pool according to the connection relation;
in the slice application layer, the slice application judges new services with different resource requirements in the network according to the received service information, and calls required resources matched with the new services from a resource pool to establish corresponding multidimensional resource network slices; the slice application sends the multidimensional resource network slice to a controller in the control layer through a northbound interface;
and at the control layer, the controller translates the multidimensional resource network slice into first equipment configuration information, and issues the first equipment configuration information to equipment in the corresponding network layer through the southward interface so as to realize the deployment of the multidimensional resource network slice.
According to the technical scheme, the connection relation among the multi-dimensional resources is established according to the topology information and the resource information, the multi-dimensional resource pool is established according to the connection relation, the new services with different resource requirements in the network are judged according to the received service information, the required resources matched with the new services are called from the resource pool, and the corresponding multi-dimensional resource network slices are established; the multidimensional resource network slice is translated into first equipment configuration information, and the first equipment configuration information is issued to equipment in a corresponding network layer through a southbound interface so as to realize the deployment of the multidimensional resource network slice, so that the network bearing capacity and the network service quality are effectively improved on the premise of meeting the requirements of users on mixed resources.
Drawings
Fig. 1 is a schematic diagram of a prior art network slicing scheme architecture based on optical resources.
Fig. 2 is a schematic architecture diagram of a network dynamic slicing scheme based on a fixed period in the prior art.
Fig. 3 is a schematic architecture diagram of a dynamic slicing scheme of an IP + optical + cloud multidimensional resource network in the present application.
FIG. 4 is a flowchart of the multidimensional resource-oriented network dynamic slicing method of the present application.
Fig. 5 is a slice reconstruction flow diagram of the network dynamic slicing method for multi-dimensional resources in fig. 4.
Fig. 6 is a schematic diagram of an architecture of a dynamic slice of an IP + optical + cloud multidimensional resource network in the present application.
Detailed Description
According to the method and the device, different dimensionality network resources such as cloud resources, IP bandwidth resources and optical spectrum resources are isolated and flexibly distributed, and the service requirements of users are met. As shown in fig. 3, taking an IP + optical + cloud multidimensional resource network as an example, the network layer includes an IP node, an optical node, and a cloud computing storage node. The optical nodes are connected through optical fibers, and the IP nodes are connected with the optical nodes through IP channels, and the specific form can be a network cable. The IP node and the cloud computing storage node can be connected through a data center network, and the method is not in the discussion range of the slicing method. The control layer comprises an SDN controller, and the SDN controller can centrally manage all resources of the entire network layer, including connection resources of the node resources. And the slicing application of the application layer establishes a network resource pool according to the network layer information collected by the SDN controller for multidimensional resource management, and maps the network resources into virtual nodes and virtual connections through a network virtualization technology. The virtual nodes are formed by mapping the cloud computing storage nodes, the IP nodes, the optical nodes and IP channels between the IP nodes and the corresponding optical nodes, and have the functions of storage, computation and service exchange. The virtual connection is formed by mapping optical fibers and is responsible for connecting each virtual node. The slice application establishes virtual nodes and virtual connections according to service requirements, and the virtual nodes and the virtual connections jointly form a virtual network to form a virtual multi-dimensional resource network slice. By constructing and reconstructing the multidimensional resource network slice, the multidimensional resource in the network can be distributed and flexibly adjusted according to the needs.
The technical solution of the present application is further specifically described below by way of examples. This is useful for the public understanding of the present application, but the specific examples given by the applicant should not be taken as limiting the technical solution of the present invention, and any changes in the definition of parts or technical features or in the form of an overall structure without substantial changes should be taken as the scope of protection defined by the technical solution of the present application.
The present application provides a multidimensional resource-oriented network dynamic slicing method, please refer to fig. 3 and fig. 4, the method includes the following steps:
step S100, at a control layer, a controller obtains topology information, resource information and service information of a multidimensional resource network in a network layer through a southbound interface and a protocol; the resource information comprises node resource information, and the topology information comprises topology connection information. The topological connection information refers to the connection relation among the IP nodes, the optical nodes and the cloud computing storage nodes; the node resource information refers to information of each IP node, optical node and cloud computing storage node, such as port information of the IP node and the optical node, CPU information and memory information of the cloud computing storage node; the service information comprises service types, maximum tolerance time delay of normal service transmission, a service transmission starting point, a service transmission end point, service required bandwidth, service calculation processing requirements (for example, vehicle navigation service of the internet of vehicles needs to calculate vehicle position information in real time), and the like. In this embodiment, the controller is an SDN controller.
And step S102, in the control layer, the controller sends the topology information, the resource information and the service information to the slice application layer through the northbound interface.
And step S104, in the slice application layer, the slice application establishes a connection relation between the multidimensional resources according to the topology information and the resource information, and establishes a multidimensional resource pool according to the connection relation. The multidimensional resource pool is a database containing information and connection relation of multidimensional resource equipment. Taking multidimensional resources composed of IP, light and cloud as an example, the multidimensional resource pool comprises: (1) IP device information, such as IP port, bandwidth information; (2) optical device information, such as optical spectrum information; (3) cloud device information, such as virtual machine information; (4) and the connection information of the IP equipment, the optical equipment and the cloud equipment, for example, the IP equipment A is connected with the optical equipment B through a port X, and the IP bandwidth between the A and the B is 50 Mbps.
Step S106, in the slice application layer, the slice application judges new services with different resource requirements in the network according to the received service information, and calls the required resources matched with the new services from the resource pool to establish corresponding multidimensional resource network slices; the slice application sends the multidimensional resource network slice to a controller in the control layer through a northbound interface. Wherein, step S106 specifically includes: the slice application analyzes according to the service information to obtain service requirements, wherein the service requirements comprise bandwidth requirements and calculation requirements of the service; the slice application calculates a service transmission path according to service requirements, calculates resource requirements according to the service requirements and calculated transmission path results, and calls required resources matched with the service requirements from a resource pool, for example, according to the bandwidth requirements and the transmission path, calculates IP resources (bandwidth) optical resources (spectrum) and cloud resources (virtual machines) which need to be allocated to the service on the transmission path, when the new service bandwidth requires 500Mbps, the calculation resources need 2 CPU cores and 500M memories, and the transmission path is IP node a-optical node B-optical node C-IP node D-cloud node E-IP node D-optical node C-optical node F-IP node G, then the calculated resource requirements are: (1) the connection bandwidth between the IP node and the optical node is 500Mbps, and the connection bandwidth comprises IP channels among nodes A-B, C-D and F-G; (2) the spectrum resources which can realize 500Mbps bandwidth transmission between the optical nodes comprise the connection between the nodes B-C and C-F; (3) a virtual machine resource of the cloud node, for example, a virtual machine is allocated to the service in the cloud node E for performing computing processing, and the virtual machine includes 2 CPU cores and 500M memory; the slice application generates virtual nodes and virtual connections according to the service transmission path and the called required resources to form a virtual network so as to establish corresponding multidimensional resource network slices, wherein the virtual nodes are formed by mapping cloud computing storage nodes, IP nodes, optical nodes and IP channels between the IP nodes and the corresponding optical nodes, and the virtual connections are formed by mapping optical fibers and are responsible for connecting each virtual node; the slice application sends the multidimensional resource network slice to a controller in the control layer through a northbound interface. For example, the service information is delay sensitive service information of a delay sensitive service with a higher requirement on delay in a network, slice application performs requirement analysis on the delay sensitive service, and calculates a low-delay transmission path according to the low-delay requirement after judging that the service has a low-delay requirement, wherein an optimal delay path is selected by taking IP bandwidth capacity, optical spectrum capacity, storage capacity of a cloud node and calculation time as references in the process of calculating the low-delay transmission path; and the slice application calculates the required IP bandwidth resources, optical spectrum resources and cloud node resources according to the low-delay transmission path, calls the corresponding required resources from the established multidimensional resource pool, and establishes the multidimensional resource network slice, wherein the required resources are the virtual machines of the IP bandwidth, the optical spectrum or the cloud node.
Step S108, at the control layer, the controller translates the multidimensional resource network slice into first equipment configuration information, and issues the first equipment configuration information to equipment in the corresponding network layer through the southbound interface, so as to realize the multidimensional resource network slice deployment. For example, the devices in the network layer refer to cloud computing storage nodes, IP nodes, and optical node devices corresponding to the virtual nodes.
When the slice application senses that the shortage of resources in the slice cannot meet the service requirement, the service quality (QoS) loss generated in the slice reconstruction process and the improvement of the service quality after the slice reconstruction are evaluated, the multidimensional resources in the slice are adjusted according to the service requirement and the evaluation result, the network slice reconstruction of the multidimensional resources is also carried out, the service quality of the whole network is improved, and the problems of low utilization rate of the multidimensional resources, lack of scheduling according to requirements and the like are solved.
Further, referring to fig. 5, the method for dynamically slicing a multidimensional resource-oriented network further includes the following steps:
step S110, when the slice application judges that the real-time QoS in any service information periodically sent by the controller is not suitable for the corresponding and pre-stored service quality reference value, the corresponding multidimensional resource network slice is reconstructed according to the service information and the multidimensional resource pool so as to obtain the multidimensional resource network reconstruction slice. Wherein, step S110 specifically includes: initializing QoS weights of the multidimensional resource network slices according to different requirements of the bearer services of the multidimensional resource network slices on the QoS of the corresponding multidimensional resource network slices, wherein the higher the QoS requirements are, the larger the weights are, for example, the QoS weights can be determined according to service importance, the importance is divided into low, medium and high, and the weights are 1, 2 and 3; initializing tolerance threshold values of the services of the multidimensional resource network slices to the minimum QoS of the network according to different requirements of the bearer services of the multidimensional resource network slices on the QoS of the corresponding multidimensional resource network slices, wherein the higher the QoS requirement is, the higher the QoS threshold value is, the QoS threshold value can be selected according to user requirements, for example, a user pays attention to service delay, and the QoS threshold value can be calculated through the delay, if the QoS calculation mode is as follows: QoS = 1/average delay of traffic within a slice, the QoS threshold may be calculated in a specific manner as follows: the QoS threshold value = 1/(ideal time delay of service within a slice α), α >1, α is determined according to the QoS requirement of the service, and the higher the requirement is, the larger α is; monitoring the network QoS of each network slice in a fixed period, and judging whether the QoS of any network slice is lower than a QoS threshold corresponding to the QoS of the network slice according to the QoS of each network slice and the QoS threshold; if no slice with the QoS lower than the QoS threshold exists, continuing monitoring; if the slices with the QoS lower than the QoS threshold exist, all feasible reconstruction schemes are calculated for the network slices with the QoS lower than the QoS threshold; calculating the influence of the reconstruction of the network slice on the QoS according to the reconstruction scheme, wherein the influence comprises the negative influence on the existing service in the network slice in the reconstruction process and the improvement degree on the QoS of the network slice after the slice is reconstructed; and calculating the weighted average QoS of the whole network according to the influence of the reconstruction of the network slices on the QoS and the QoS weight of each slice, and selecting a reconstruction scheme with the maximum weighted average QoS improvement of the whole network as a multidimensional resource network reconstruction slice. Wherein the weighted average QoS of the entire network is calculated by equation (1):
for example, also taking the delay sensitive service as an example, the slice application initializes the QoS weight and QoS threshold of the multidimensional resource network slice established according to the QoS requirement of the delay sensitive service; the controller periodically sends delay sensitive service information corresponding to the multidimensional resource network slice to a slice application; the slice application analyzes the delay sensitive service information corresponding to the multidimensional resource network slice, and when judging that the QoS of the delay sensitive service corresponding to the multidimensional resource network slice is lower than a QoS threshold, the slice application calculates all feasible reconstruction schemes according to the low delay requirement of the delay sensitive service corresponding to the multidimensional resource network slice; calculating the influence of all feasible reconstruction schemes on the QoS of the multidimensional resource network slice, selecting the reconstruction scheme with the highest comprehensive QoS promotion as a final multidimensional resource network reconstruction slice according to the calculated delay increment value and the reduced service delay value after slice reconstruction, and selecting the reconstruction scheme with the highest weighted average QoS of all affected slices if other slice resources are required to be called for reconstruction; wherein, the delay increment value is the delay increment value caused by the reconstruction of the slice to the existing service in the multidimensional resource network slice.
And step S112, in the slice application layer, the slice application sends the multi-dimensional resource network reconstruction slice to a controller in the control layer through a northbound interface.
Step S114, at the control layer, the controller translates the multidimensional resource network reconfiguration slice into second device configuration information, and issues the second device configuration information to devices in the corresponding network layer through the southbound interface, so as to implement multidimensional resource network slice deployment again.
And step S116, updating the QoS threshold value corresponding to each network slice according to the reconstructed QoS of each network slice.
Through the above steps S110 to S116, the technical problem of "easily causing network QoS reduction and network resource waste" in the network dynamic slice reconfiguration scheme with a fixed period can be solved, and please refer to fig. 2, although the controller detects the network service according to the fixed time period and performs slice reconfiguration according to the change condition of the network service, so that the reconfigured network can meet the changed service requirement, the network dynamic slice scheme based on the fixed period does not consider the negative effect of the slice reconfiguration on the existing service of the network, and determines whether to perform the slice reconfiguration only through the time period. And the service drastic change does not necessarily occur in each monitoring period, which leads to the great reduction of QoS, when the service only changes in a small degree, the negative influence generated in the slice reconstruction process is even greater than the benefit of slice reconstruction, so that the load of the controller is increased, and the network service quality is reduced on the contrary. Therefore, the network slice can be dynamically adjusted according to the network service change through the network dynamic slice scheme based on the fixed period, and the service dynamic requirements are met. However, the scheme neglects the negative influence on the network performance in the network slice reconstruction process, is difficult to meet the flexible scheduling requirement of the user on the multidimensional resources, and is easy to cause the reduction of the network QoS and the waste of the network resources.
In order to facilitate understanding of the technical solutions and effects achieved by the technical solutions of the present application, the following is further described by description of an embodiment: the network dynamic slice oriented to the multidimensional resource can be applied to a multi-resource network, taking an IP + light + cloud multidimensional resource network as an example, as shown in fig. 6.
When the service changes dynamically, for example, the delay of the delay sensitive service is increased due to the increase of the network load, the network slice reconstruction of the multidimensional resource needs to be performed:
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A network dynamic slicing method facing multidimensional resources comprises the following steps:
at the control layer, the controller obtains topology information, resource information and service information of the multidimensional resource network in the network layer through a southward interface and a protocol;
at the control layer, the controller sends the topology information, the resource information and the service information to the slice application layer through a northbound interface;
in the slice application layer, the slice application establishes a connection relation between the multidimensional resources according to the topology information and the resource information, and establishes a multidimensional resource pool according to the connection relation;
in the slice application layer, the slice application judges new services with different resource requirements in the network according to the received service information, and then calls the required resources matched with the new services from the resource pool to establish corresponding multidimensional resource network slices; the slice application sends the multidimensional resource network slice to a controller in the control layer through a northbound interface;
and at the control layer, the controller translates the multidimensional resource network slice into first equipment configuration information, and issues the first equipment configuration information to equipment in the corresponding network layer through the southward interface so as to realize the deployment of the multidimensional resource network slice.
2. The multidimensional resource-oriented network dynamic slicing method according to claim 1, wherein: in a slice application layer, if the slice application judges that a network has new services with different resource requirements, the required resources matched with the new services are called from a resource pool, and a corresponding multidimensional resource network slice is established; the sending of the multidimensional resource network slice to the controller in the control layer by the slice application through the northbound interface is specifically as follows:
the slice application analyzes according to the service information to obtain service requirements;
the slice application calculates a service transmission path according to the service requirement;
the slice application calculates the resource requirement according to the service requirement and the calculated transmission path result, and calls the required resource matched with the service requirement from the resource pool;
the slice application generates virtual nodes and virtual connections according to the service transmission path and the called required resources to form a virtual network so as to establish corresponding multidimensional resource network slices;
the slice application sends the multidimensional resource network slice to a controller in the control layer through a northbound interface.
3. The multidimensional resource-oriented network dynamic slicing method according to claim 1 or 2, characterized in that: at the control layer, the controller is an SDN controller.
4. The method for dynamically slicing multidimensional resource oriented network according to claim 3, further comprising the steps of:
in a slice application layer, when the slice application judges that the real-time QoS in any service information periodically sent by the controller is not suitable for a corresponding and pre-stored service quality reference value, reconstructing the corresponding multidimensional resource network slice according to the service information and the multidimensional resource pool to obtain a multidimensional resource network reconstruction slice;
in the slice application layer, the slice application sends the multidimensional resource network reconstruction slice to a controller in the control layer through a northbound interface;
and at the control layer, the controller translates the multidimensional resource network reconstruction slice into second equipment configuration information, and issues the second equipment configuration information to equipment in the corresponding network layer through the southward interface so as to realize the multidimensional resource network slice deployment again.
5. The multidimensional resource-oriented network dynamic slicing method according to claim 4, wherein: in a slice application layer, when the slice application judges that a real-time service quality value in any service information periodically sent by a controller is not suitable for a corresponding and pre-stored service quality reference value, reconstructing the corresponding multidimensional resource network slice according to the service information and a multidimensional resource pool to obtain a multidimensional resource network reconstruction slice; the method specifically comprises the following steps:
initializing QoS weights of the multidimensional resource network slices according to different requirements of the bearer service of each multidimensional resource network slice on the QoS of the corresponding multidimensional resource network slice, wherein the higher the requirement on the QoS is, the larger the weight is;
initializing a minimum QoS threshold value of the service of each multidimensional resource network slice to the network according to different requirements of the bearer service of each multidimensional resource network slice to the QoS of the corresponding multidimensional resource network slice, wherein the higher the requirement to the QoS is, the higher the QoS threshold value is;
monitoring the QoS of each network slice in a fixed period, and judging whether the QoS of any network slice is lower than the QoS threshold corresponding to the QoS of the network slice according to the QoS of each network slice and the QoS threshold;
if no slice with the QoS lower than the QoS threshold exists, continuing monitoring;
if the slices with the QoS lower than the QoS threshold exist, all feasible reconstruction schemes are calculated for the network slices with the QoS lower than the QoS threshold;
calculating the influence of the reconstruction of the network slice on the QoS according to the reconstruction scheme, wherein the influence comprises the negative influence on the existing service in the network slice in the reconstruction process and the improvement degree on the QoS of the network slice after the slice is reconstructed;
and calculating the weighted average QoS of the whole network according to the influence of the reconstruction of the network slices on the QoS and the QoS weight of each slice, and selecting a reconstruction scheme with the maximum weighted average QoS improvement as a multidimensional resource network reconstruction slice.
6. The multidimensional resource-oriented network dynamic slicing method according to claim 5, wherein: and updating the QoS threshold corresponding to each network slice according to the QoS of each reconstructed network slice.
7. The multidimensional resource-oriented network dynamic slicing method of claim 6, wherein: the weighted average QoS of the entire network is calculated by equation (1):
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