CN113810939A - User-insensitive network slice dynamic mapping device and method - Google Patents
User-insensitive network slice dynamic mapping device and method Download PDFInfo
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Abstract
The invention belongs to the technical field of network slicing, and particularly relates to a user-insensitive dynamic network slice mapping device and a method, wherein the device comprises a slice demand analysis unit, a slice calculation unit, a slice scheduling unit, a slice mapping unit and a slice monitoring unit; a slice requirement analysis unit generates a network slice requirement view; the slice calculation unit can calculate at least three slice mapping schemes; the slice scheduling unit actively or passively schedules a slice mapping scheme; the slice mapping unit completes function mapping according to one of the slice mapping schemes calculated by the slice calculating unit submitted by the slice scheduling unit to generate a network slice; the slice monitoring unit monitors the change condition of the user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping condition in real time and guides the dynamic mapping of the slices. When the bottom physical network fails or the user requirement changes, the method and the device ensure that the mapping process and the scheduling process of the slice are not sensitive to users, and ensure the user experience.
Description
Technical Field
The invention belongs to the technical field of network slicing, and particularly relates to a user-insensitive dynamic mapping device and method for network slices.
Background
The network slicing technology virtualizes a special network in a physical network, forms a network for providing special service for specific service according to the specific requirement of the service on the network, achieves high matching of the network and the service, and is widely deployed in novel network architectures such as a 5G network and the like. However, in the face of new networks with complicated types and increasingly changing structures, the existing network slice mapping mechanism has entered the performance bottleneck stage.
In recent years, the mapping problem of network slices attracts the attention of the industry, and how to ensure the agility, reliability and operation cost of network slice mapping becomes a hot research trend in the field of novel network structures. However, related research is mostly focused on a mapping method of a static network slice at present, the method avoids the situation that a predefined physical network structure may have node failure or link congestion, and compared with a dynamic slice mapping method, the matching granularity of services and resources is relatively rough. In fact, these static slice mapping methods do not consider the actual network state change, and only perform the determination according to the network state when the slice is designed, which is difficult to process heterogeneous networks and effectively implement multi-class information fusion, and is easy to cause the user experience degradation.
Disclosure of Invention
Aiming at the changes of the bottom physical network structure and the user requirements which may occur in real time in the traditional network and the novel network, the invention provides a user-insensitive dynamic mapping device and a user-insensitive dynamic mapping method for network slices, which are combined with the ideas of network function virtualization and software defined network, the invention supports dynamic mapping of the network slices aiming at different communication requirements in the novel network, supports network slice scheduling, mapping relation between the slices and the physical network and user insensitivity in the scheduling process, and ensures user experience.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a user-insensitive dynamic mapping device for a network slice, which is arranged between a virtual network layer where the network slice is located and a bottom physical network and specifically comprises a slice demand analysis unit, a slice calculation unit, a slice scheduling unit, a slice mapping unit and a slice monitoring unit;
the slice requirement analysis unit receives the requirements of the user on network node resources and link resources and generates a network slice requirement view;
the slice computing unit computes the matching relation between the virtual network slice topology and the physical network topology according to different user service requirements and the bearing capacity of the underlying physical network, and can compute at least three slice mapping schemes;
the slice scheduling unit actively or passively schedules a slice mapping scheme, and realizes network function migration and flow path adjustment when the service requirement of a user or the structure of a bottom physical network changes;
the slice mapping unit is used for completing functional mapping according to one slice mapping scheme calculated by the slice calculating unit submitted by the slice scheduling unit to generate a network slice;
the slice monitoring unit monitors the change condition of the user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping condition in real time and guides the dynamic mapping of the slice.
Further, the slice requirement analysis unit constructs a virtual slice topology according to the requirements of the service on transmission bandwidth and processing capacity, and the physical topology corresponding to the virtual slice topology is described in the form of an effective resource graph of each node and link in the network.
Further, after the slice calculation unit obtains the virtual slice topology and the real physical topology, it calculates at least three slice mapping schemes for the network slice on the basis of the minimum topology intersection among the mapping schemes, where the slice mapping schemes need to consider slice service performance and heterogeneity among the schemes.
Further, the task mode of the slice scheduling unit is divided into a slice passive scheduling mode and a slice active scheduling mode; the slice passive scheduling mode is suitable for a network with an infrequent change of a topological structure, and the slice active scheduling mode is suitable for a network with a frequent change of a topological structure.
Further, the slice passive scheduling mode includes: when a node corresponding to a certain scheme mapping relation completed by the slice mapping unit fails, the slice monitoring unit acquires the node failure condition and informs the slice computing unit to generate a slice mapping scheme with low path migration cost according to the residual topology in the bottom physical network; or when a link corresponding to a scheme mapping relation completed by the slice mapping unit fails, the slice monitoring unit acquires a link failure condition and informs the slice computing unit to generate a slice mapping scheme with low path migration cost according to the residual topology in the bottom-layer physical network; the slice scheduling unit then selects the slice mapping scheme recalculated by the slice calculation unit and submits it to the slice mapping unit.
Further, the slice active scheduling mode includes: the slice computing unit designs a slice mapping scheme according to the user service requirement to form a plurality of slice mapping schemes, and the selection schemes of the relay node and the link except necessary nodes among the plurality of slice mapping schemes take the minimum intersection as a principle; in the communication process, the slice scheduling unit controls various slice mapping schemes to be dynamically and randomly scheduled at intervals according to a certain probability;
meanwhile, the slice monitoring unit monitors the node and link conditions of the bottom layer physical network in real time, if a node or link corresponding to a certain slice mapping scheme fails, the slice scheduling unit is informed that the scheme does not participate in the scheduling of the slice mapping relation any more, and the slice computing unit is informed to generate a new slice mapping scheme with a smaller intersection with other slice mapping schemes according to the residual topology in the bottom layer physical network to continue to participate in the scheduling.
Further, the slice monitoring unit includes:
when the physical network part fails or the slice mapping fails, the slice monitoring unit feeds back information to the slice calculating unit and the slice scheduling unit in time to calculate a new slice mapping scheme;
when the user requirement changes, the slice monitoring unit feeds back information to the slice requirement analysis unit in time to generate a new network slice requirement view, and guides the slice calculation unit, the slice scheduling unit and the slice mapping unit to carry out dynamic mapping on the network slices according to the new network slice requirement view.
The invention also provides a user-insensitive dynamic mapping method for the network slices, which comprises the following steps:
receiving the requirements of a user on network node resources and link resources, and generating a network slice requirement view;
according to different user service requirements and the bearing capacity of a bottom physical network, calculating the matching relation between the virtual network slice topology and the physical network topology, and calculating at least three slice mapping schemes;
the slice mapping scheme is actively or passively scheduled, and when the service requirement of a user or the structure of a bottom physical network changes, network function migration and flow path adjustment are realized;
completing functional mapping according to one of the slice mapping schemes calculated by the slice calculating unit submitted by the slice scheduling unit to generate a network slice;
and monitoring the change condition of the user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping condition in real time, and guiding the dynamic mapping of the slices.
Compared with the prior art, the invention has the following advantages:
the method comprises the steps of firstly acquiring the requirement of a user on network capacity, and calculating a possible slice mapping scheme suitable for the requirement of the user on the basis of the consideration of avoiding the influence of the possible structural change of a physical network corresponding to a slice on the slice; after forming a plurality of feasible slice mapping schemes, one of the slice mapping schemes is actively or passively selected and mapping is performed to generate network slices. The invention introduces a dynamic scheduling mechanism of network slices into the network, and is used for ensuring that users do not feel in the mapping process and the scheduling process of the slices when a bottom-layer physical network fails or the user requirements change, constructing full-dimensional perception and real-time adaptation between the state of the bottom-layer physical network and the service requirements, realizing rapid migration of the slices, and ensuring that the service experience of upper-layer users is not influenced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a user-insensitive network slice dynamic mapping apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection between the user-insensitive network slice dynamic mapping apparatus and the virtual network layer and the underlying physical network according to the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a correspondence between a virtual slice topology and an actual physical network topology according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a slice passive scheduling mode of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a slice active scheduling mode of an embodiment of the present invention;
fig. 6 is a flowchart of a user-insensitive dynamic mapping method for network slices according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
Macroscopically, the overall design of the invention is based on the idea that a network slice decouples a physical network from a user network (as shown in fig. 2), a virtual service subnet corresponding to user requirements is realized in the physical network, and the user is insensitive to underlying network faults, i.e., changes occurring in the physical network do not affect the satisfaction of user experience, thereby avoiding possible service quality degradation and realizing efficient allocation of network resources.
The device for dynamically mapping the network slices without the user feeling is arranged between a virtual network layer where the network slices are located and a bottom physical network, and specifically comprises 5 modules, namely a slice requirement analysis unit, a slice calculation unit, a slice scheduling unit, a slice mapping unit and a slice monitoring unit, as shown in fig. 1.
The slice requirement analysis unit receives the requirements of the user on network node resources and link resources and generates a network slice requirement view.
Specifically, as shown in fig. 3, the slice requirement analysis unit constructs a virtual slice topology according to the requirements of the service on transmission bandwidth and processing capacity; the physical topology corresponding to the virtual slice topology is described in the form of a graph of the effective resources of each node and link in the network.
The slice calculation unit defines the service, function, capacity and connection relation of the network slices according to different user service requirements and the bearing capacity of the underlying physical network, calculates the matching relation of the virtual network slice topology and the physical network topology, and can calculate at least three slice mapping schemes.
Specifically, after the slice calculation unit obtains a virtual slice topology and a real physical topology, on the basis of the principle that the topology intersection of all mapping schemes is minimum (the feasibility of other schemes is guaranteed after one scheme fails), at least three slice mapping schemes are calculated for the network slice, and the slice mapping schemes need to comprehensively consider the slice service performance and the heterogeneity among the schemes.
The slice scheduling unit actively or passively schedules a slice mapping scheme according to the stable condition of the network topology, and when the service requirement of a user or the structure of a bottom physical network changes, network function migration and flow path adjustment are realized, and the accurate matching of virtual resources and service loads is supported. The purpose of slice scheduling is that when the user's needs or the underlying physical network structure change, the network can still continuously meet the user's expectations, and the user is not aware of the slice mapping and scheduling process.
Specifically, the task mode of the slice scheduling unit is divided into a slice passive scheduling mode and a slice active scheduling mode; the slice passive scheduling mode is suitable for a network with an infrequent change of a topological structure, and the slice active scheduling mode is suitable for a network with a frequent change of a topological structure.
In this example, the slice passive scheduling mode specifically includes: as shown in fig. 4, the slice calculation unit calculates a slice mapping scheme according to the communication requirement of the user, forming a first mapping scheme, which can support the communication requirement of the user with less communication cost. When a node (for example, a node B) corresponding to a mapping relation of a mapping scheme I completed by a slice mapping unit fails, a slice monitoring unit acquires a node failure condition and informs a slice computing unit to generate a slice mapping scheme with low path migration cost according to residual topology in a bottom-layer physical network to form a mapping scheme II, wherein the path migration cost of the scheme is low on the basis of the mapping scheme I; similarly, when the slice mapping unit completes the failure of a corresponding link (for example, link GH) in the mapping relationship of the mapping scheme II, the slice monitoring unit acquires the link failure condition and informs the slice computing unit to generate a slice mapping scheme with low path migration cost according to the residual topology in the bottom-layer physical network to form a mapping scheme III, and the path migration cost of the scheme is low on the basis of the mapping scheme II; the slice scheduling unit then selects the slice mapping scheme recalculated by the slice calculation unit and submits it to the slice mapping unit.
In this example, in the active scheduling mode, slices are actively scheduled at fixed time intervals. The slice active scheduling mode specifically includes: as shown in fig. 5, the slice calculation unit designs slice mapping schemes according to communication requirements of users, so as to form a first slice mapping scheme, a second slice mapping scheme and a third slice mapping scheme, and the selection schemes of the relay node and the link, except for necessary nodes, use the minimum intersection as a principle. In the communication process, the slice scheduling unit controls three slice mapping schemes to be dynamically and randomly scheduled at intervals according to a certain probability; meanwhile, the slice monitoring unit monitors the node and link conditions of the bottom layer physical network in real time, if a node or link corresponding to a certain slice mapping scheme fails, the slice scheduling unit is informed that the scheme does not participate in the scheduling of the slice mapping relation any more, and the slice computing unit is informed to generate a new slice mapping scheme with a smaller intersection with other slice mapping schemes according to the residual topology in the bottom layer physical network to continue to participate in the scheduling.
And the slice mapping unit is used for completing functional mapping according to one of the slice mapping schemes calculated by the slice calculating unit submitted by the slice scheduling unit to generate the network slice.
The slice monitoring unit monitors the change condition of the user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping condition in real time and guides the dynamic mapping of the slice. When the physical network part fails or the slice mapping fails, the slice monitoring unit feeds back information to the slice computing unit and the slice scheduling unit in time, the slice scheduling unit adopts an unaffected mapping scheme, and the slice computing unit computes a new slice mapping scheme to ensure that the selectable slice mapping schemes are not less than 3; when the user requirement changes, the slice monitoring unit feeds back information to the slice requirement analysis unit in time to generate a new network slice requirement view, and guides the slice calculation unit, the slice scheduling unit and the slice mapping unit to carry out dynamic mapping on the network slices according to the new network slice requirement view. And the information in the physical network is updated according to the actual mapping result, so that the dynamic, efficient and accurate adaptation of network resources and user requirements is achieved, and the user is insensitive to the slice mapping and scheduling process.
After a user controller issues communication requirements, the device performs slice calculation for a user by combining the user requirements and physical network conditions and maps the slice calculation to an underlying network, and then actively or passively completes the operation of remapping the slices when resource congestion or failure occurs in the underlying network structure. The user only needs to acquire the device and generates the special virtual network slice according to the requirement, complex resources and structural changes in an actual physical network do not need to be dealt with, underlying network information does not need to be known, and changes of the underlying network cannot influence user experience.
Through the system operation of the above 5 modules, the invention can realize the non-sensory dynamic mapping of the network slice by the user, effectively improve the stability and the high efficiency of the network slice, facilitate the network manager to deal with the fault in the physical network in time and ensure the effective support of the network slice to each service of the upper layer.
Corresponding to the above-mentioned network slice dynamic mapping apparatus, this embodiment further provides a network slice dynamic mapping method, as shown in fig. 6, including the following steps:
and step S61, receiving the requirement of the user for the network node resource and the link resource, and generating a network slice requirement view.
And step S62, calculating the matching relation between the virtual network slice topology and the physical network topology according to different user service requirements and the bearing capacity of the underlying physical network, and calculating at least three slice mapping schemes.
Step S63, the slice mapping scheme is actively or passively scheduled, and when the user service requirement or the structure of the underlying physical network changes, network function migration and traffic path adjustment are implemented.
And step S64, completing function mapping according to one of the slice mapping schemes calculated by the slice calculating unit submitted by the slice scheduling unit, and generating the network slice.
And step S65, monitoring the change situation of user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping situation in real time, and guiding the dynamic mapping of the slice.
The invention virtualizes the network slice from the physical network according to the specific communication demand, the user can only see the communication subject in the communication demand, only the communication subject needs to be given a communication instruction without knowing the actual communication path, and the actual communication path can be actively or passively scheduled according to the network state so as to deal with the failure condition of the nodes and links in the underlying network.
It is to 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.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A user-insensitive network slice dynamic mapping device is characterized in that the device is arranged between a virtual network layer where a network slice is located and a bottom physical network, and specifically comprises a slice demand analysis unit, a slice calculation unit, a slice scheduling unit, a slice mapping unit and a slice monitoring unit;
the slice requirement analysis unit receives the requirements of the user on network node resources and link resources and generates a network slice requirement view;
the slice computing unit computes the matching relation between the virtual network slice topology and the physical network topology according to different user service requirements and the bearing capacity of the underlying physical network, and can compute at least three slice mapping schemes;
the slice scheduling unit actively or passively schedules a slice mapping scheme, and realizes network function migration and flow path adjustment when the service requirement of a user or the structure of a bottom physical network changes;
the slice mapping unit is used for completing functional mapping according to one slice mapping scheme calculated by the slice calculating unit submitted by the slice scheduling unit to generate a network slice;
the slice monitoring unit monitors the change condition of the user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping condition in real time and guides the dynamic mapping of the slice.
2. The device according to claim 1, wherein the slice requirement analysis unit constructs a virtual slice topology according to the requirements of the traffic on transmission bandwidth and processing capacity, and the physical topology corresponding to the virtual slice topology is described in the form of a graph of effective resources of each node and link in the network.
3. The device for dynamically mapping network slices insensitive to users according to claim 2, wherein the slice calculation unit calculates not less than three slice mapping schemes for the network slices based on a principle that a topology intersection between the mapping schemes is minimum after acquiring the virtual slice topology and the real physical topology, and the slice mapping schemes need to consider slice service performance and heterogeneity between the schemes.
4. The user-insensitive network slice dynamic mapping apparatus according to claim 1, wherein the task mode of the slice scheduling unit is divided into two modes, a slice passive scheduling mode and a slice active scheduling mode; the slice passive scheduling mode is suitable for a network with an infrequent change of a topological structure, and the slice active scheduling mode is suitable for a network with a frequent change of a topological structure.
5. The user-insensitive network slice dynamic mapping apparatus of claim 4, wherein the slice passive scheduling mode comprises: when a node corresponding to a certain scheme mapping relation completed by the slice mapping unit fails, the slice monitoring unit acquires the node failure condition and informs the slice computing unit to generate a slice mapping scheme with low path migration cost according to the residual topology in the bottom physical network; or when a link corresponding to a scheme mapping relation completed by the slice mapping unit fails, the slice monitoring unit acquires a link failure condition and informs the slice computing unit to generate a slice mapping scheme with low path migration cost according to the residual topology in the bottom-layer physical network; the slice scheduling unit then selects the slice mapping scheme recalculated by the slice calculation unit and submits it to the slice mapping unit.
6. The user-insensitive network slice dynamic mapping apparatus of claim 4, wherein the slice active scheduling mode comprises: the slice computing unit designs a slice mapping scheme according to the user service requirement to form a plurality of slice mapping schemes, and the selection schemes of the relay node and the link except necessary nodes among the plurality of slice mapping schemes take the minimum intersection as a principle; in the communication process, the slice scheduling unit controls various slice mapping schemes to be dynamically and randomly scheduled at intervals according to a certain probability;
meanwhile, the slice monitoring unit monitors the node and link conditions of the bottom layer physical network in real time, if a node or link corresponding to a certain slice mapping scheme fails, the slice scheduling unit is informed that the scheme does not participate in the scheduling of the slice mapping relation any more, and the slice computing unit is informed to generate a new slice mapping scheme with a smaller intersection with other slice mapping schemes according to the residual topology in the bottom layer physical network to continue to participate in the scheduling.
7. The user-insensitive network slice dynamic mapping apparatus according to claim 1, wherein the slice monitoring unit comprises:
when the physical network part fails or the slice mapping fails, the slice monitoring unit feeds back information to the slice calculating unit and the slice scheduling unit in time to calculate a new slice mapping scheme;
when the user requirement changes, the slice monitoring unit feeds back information to the slice requirement analysis unit in time to generate a new network slice requirement view, and guides the slice calculation unit, the slice scheduling unit and the slice mapping unit to carry out dynamic mapping on the network slices according to the new network slice requirement view.
8. A user-insensitive network slice dynamic mapping method is characterized by comprising the following steps:
receiving the requirements of a user on network node resources and link resources, and generating a network slice requirement view;
according to different user service requirements and the bearing capacity of a bottom physical network, calculating the matching relation between the virtual network slice topology and the physical network topology, and calculating at least three slice mapping schemes;
the slice mapping scheme is actively or passively scheduled, and when the service requirement of a user or the structure of a bottom physical network changes, network function migration and flow path adjustment are realized;
completing functional mapping according to one of the slice mapping schemes calculated by the slice calculating unit submitted by the slice scheduling unit to generate a network slice;
and monitoring the change condition of the user service requirement, the node of the bottom layer physical network, the link condition and the slice mapping condition in real time, and guiding the dynamic mapping of the slices.
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