CN106851705B - Wireless network slicing method based on slice flow table - Google Patents
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Abstract
The invention relates to a wireless network slicing method based on a slicing flow table, which comprises the following steps: expanding an Openflow slice flow table in an SDN architecture into a wireless access network, wherein a matching field of the slice flow table comprises a remote transmitting head RRH field and a baseband processing unit BBU field; generating at least one slicing network according to different slicing triggering conditions; the slice network comprises a static slice network, a dynamic slice network and a semi-static slice network. The wireless network slicing method based on the slicing flow table can realize the separation of data forwarding and a control plane.
Description
Technical Field
The invention belongs to the technical field of mobile communication, and relates to a wireless network slicing method based on a slicing flow table.
Background
5G is a new generation wireless mobile communication network, and is mainly used for meeting the mobile communication requirements after 2020. Under the push of the mobile internet with high-speed development and the ever-increasing business requirements of the internet of things, 5G is required to have the characteristics of low cost, low energy consumption, safety and reliability, meanwhile, the transmission rate is increased by 10 to 100 times, the peak transmission rate reaches 10Gbit/s, the end-to-end time delay reaches millisecond level, the density of connecting equipment is increased by 10 to 100 times, the flow density is increased by 1000 times, the spectrum efficiency is increased by 5 to 10 times, and the user experience can be ensured at the speed of 500 km/h. In order to meet various requirements of 5G, a large-scale antenna array technology, a novel multiple access technology, a full-frequency service technology and the like are mainly applied to the aspect of a wireless transmission technology. In terms of network architecture, the future 5G will be a more flexible, intelligent, efficient and open heterogeneous converged network system based on Software Defined Networking (SDN), network function virtualization and cloud computing technologies.
SDN has been generally accepted by the industry as a new technology with a significant impact on the network. The SDN technology is a global and subversive network transformation technology, a traditional 'closed' network is transformed by adopting an IT technology mode, the network capability is redefined by using a software definition method, so that the network moves from static state to dynamic state, some problems which cannot be avoided in the traditional network are solved, including low response speed to requirement change, incapability of realizing network virtualization, high operation and maintenance cost, high equipment cost and the like, and new opportunities are brought to network development.
At present, in the target network selection of SDN deployment, an operator mainly aims at an MPLS backbone network, a cloud service network, and a cross-layer transport network, and further includes a metropolitan area aggregation, an optical network, and a radio access network. Currently, research on the wireless access network for the SDN architecture mainly focuses on discussion and research on the network architecture. And there are also some technical challenges to applying SDN into wireless networks. Implementing a software defined network requires at least the ability to define slices and isolate them, and also requires network devices to measure and report their status to the controller, which is difficult to achieve using a wireless transmission medium.
Disclosure of Invention
In view of the above, the present invention provides a wireless network slicing method based on a slicing flow table, which can implement separation of data forwarding and a control plane.
In order to achieve the purpose, the invention provides the following technical scheme:
a wireless network slicing method based on a slice flow table, the method comprising:
expanding an Openflow slice flow table in an SDN architecture into a wireless access network, wherein a matching field of the slice flow table comprises a remote transmitting head RRH field and a baseband processing unit BBU field;
generating at least one slicing network according to different slicing triggering conditions; the slice network comprises a static slice network, a dynamic slice network and a semi-static slice network.
Further, the RRH field includes:
an entity RRH physical identification; an RRH physical port; the transmit power of the base station; the number of base station antennas; a modulation coding strategy; a channel propagation model; propagating the frame structure; an entity Fronthaul physical identity; a frontaul physical port; delay bound of Fronthaul; capacity limitation of Fronthaul.
Further, the BBU field includes:
physical BBU identification; a BBU physical port; a resource scheduling mode; configuring a protocol stack; the amount of bandwidth allocation.
Further, the static sliced network is generated as follows:
an operator or a service provider sends a slicing request to the SDN controller through an Application Programming Interface (API);
the SDN controller generates slice flow table data according to a network slice strategy;
the SDN controller modifies slice flow table information in the BBU and the RRH to form a new slice network;
and establishing a data transmission channel, and matching the data transmission channel with a slice flow table to form a data forwarding plane when a user needs to access the new slice network.
Further, the dynamic sliced network is generated as follows:
a network slicing request sent by a user is reported to the SDN controller through the RRH;
the SDN controller forms a slice flow table parameter according to current network state information and a slice generation strategy;
the SDN controller modifies slice flow tables of the RRH and the BBU through signaling interaction;
and the user establishes a data forwarding plane according to the matching slice flow table.
Further, the semi-static sliced network is generated as follows:
in the existing static sliced network, if a new network slicing request sent by a user occurs, a new network is generated according to a mode of generating a dynamic sliced network.
Further, extending the Openflow slice flow table in the SDN architecture into the wireless access network comprises:
at least one slice flow table is added in each access network entity.
Further, the method further comprises:
controlling the slice flow table through an SDN controller, and forwarding data through matching forwarding of the slice flow table to realize separation of data forwarding and a control plane.
The invention has the beneficial effects that:
1) the flow table in the SDN architecture is expanded into a wireless access network, the SDN controller is used for controlling the slice flow table, and the data forwarding is matched and forwarded through the slice flow table, so that the separation of data forwarding and a control plane is realized. The matching field of the slice flow table mainly comprises an RRH field and a BBU field, and the two parts respectively correspond to a physical layer of a wireless access network, network parameters related to a second layer and a third layer, a forwarding flow and a port.
2) The slicing mode is divided into the following modes according to different slicing network generation triggering conditions: static slicing mode, dynamic slicing mode, and semi-static slicing mode. The method mainly realizes that the SDN controller modifies the network slice flow table and matches the data flow with the slice flow table so as to realize the forwarding of the data flow, and the method well realizes the separation of network control and data forwarding. In addition, through the control of the SDN controller, the modification of relevant attributes of slice flow tables of different slice networks can be quickly and conveniently realized, so that the specificity of each slice network can be better distinguished, differential configuration can be carried out on each slice network, and the maintenance of each slice network is also facilitated.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a schematic view of a wireless network slice scene based on a slice flow table in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a slice flow table according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a static slicing method according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating a dynamic slicing method according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a semi-static slicing method according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The embodiment of the application provides a wireless network slicing method based on a slicing flow table, which comprises the following steps:
expanding an Openflow slice flow table in an SDN architecture into a wireless access network, wherein a matching field of the slice flow table comprises a remote transmitting head RRH field and a baseband processing unit BBU field;
generating at least one slicing network according to different slicing triggering conditions; the slice network comprises a static slice network, a dynamic slice network and a semi-static slice network.
Specifically, referring to fig. 1, fig. 1 is a schematic view of a slice scene of a wireless network based on a slice flow table according to an embodiment of the present invention. In the case of the invention, a CRAN architecture is adopted, that is, a traditional base station is divided into a remote transmitting head (RRH) and a baseband processing unit (BBU), and an SDN controller is added to control the RRH and the BBU in consideration of introducing the SDN architecture into a radio access network. In this embodiment, at least one slice flow table may be added in each access network entity (RRH and BBU). The uplink data forwarding process of the whole network is as follows: first, the user UE connects to the RRH through a radio channel, the RRH forwards the data to the BBU through a forward link (frontaul), and finally the BBU forwards the data to a packet core network (EPC). As can be seen in the figure, the slice flow table is controlled by an SDN controller, and data forwarding is performed by matching forwarding of the slice flow table, so as to implement separation of data forwarding and control plane.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a slice flow table provided in the embodiment of the present invention, and it can be seen that a matching field of the entire table includes two fields, namely, an RRH field and a BBU field. The RRH field mainly relates to information such as physical layer parameters, forwarding ports and the like, wherein RRH ID represents entity RRH physical mark; the RRH Port represents an RRH physical Port, namely a virtual RRH equipment mark; transmit Power represents the Transmit Power of the base station; MIMO denotes the number of base station antennas; MCS denotes a modulation coding strategy; channel Model represents a Channel propagation Model; frame Type indicates a propagation Frame structure; fronthaul ID represents the physical designation of the entity Fronthaul; the Fronthaul Port represents a Fronthaul physical Port, i.e., a virtual Fronthaul device designation; delay Constraint denotes the Delay Constraint of Fronthaul; capacity Constraint denotes the Capacity limit of Fronthaul.
In this embodiment, the BBU field mainly relates to two or three layers of processing related information, where: the fields mainly contain the following contents: the BBU ID represents an entity BBU physical mark; the BBU Port represents a BBU physical Port, namely a virtual BBU equipment mark; the Schedule Type represents a resource scheduling mode; protocol represents Protocol stack configuration; bandwidth denotes the Bandwidth allocation amount.
In this embodiment, the wireless network slicing method based on the slice flow table according to the present invention controls the slice flow table through the SDN controller to realize generation of different slice networks, and may be divided into: static slicing mode, dynamic slicing mode, and semi-static slicing mode.
Referring to fig. 3, fig. 3 is a schematic flow chart of a static slicing method according to an embodiment of the present invention. As shown in fig. 3, in the static slicing mode, an operator or a service provider may actively send a slicing request to an SDN controller, and the SDN controller may generate slicing flow table data according to a network slicing policy. And then the SDN controller forms a new network slice by modifying the slice flow table information in the BBU and the RRH, and establishes a data transmission channel. And finally, connecting the user to a network to form a data transmission plane in a mode of matching the slice flow table.
Referring to fig. 4, fig. 4 is a schematic flow chart of a dynamic slicing method according to an embodiment of the present invention. As shown in fig. 4, in the dynamic slicing mode, a network slicing request sent by a user is first reported to an SDN controller through an RRH; then, the SDN controller forms specific slice flow table parameters according to the current network state information and a slice generation strategy; and finally, the SDN controller modifies slice flow tables of the RRH and the BBU through signaling interaction. And further forming a data transmission channel, and finally connecting the user to the network by matching the slice flow table to form a data transmission plane.
Referring to fig. 5, fig. 5 is a schematic flow chart of a semi-static slicing method provided by the embodiment of the invention. As shown in fig. 5, in an existing static sliced network, if a new network slicing request sent by a user occurs, a new network may be generated in a manner of generating a dynamic sliced network. Specifically, in the semi-static slicing mode, the user generates a new slicing request on the original data transmission plane. At the moment, a user sends a new network slicing request and reports the new network slicing request to the SDN controller through the RRH; then, the SDN controller forms specific slice flow table parameters according to the current network state information and a slice generation strategy; and finally, the SDN controller modifies slice flow tables of the RRH and the BBU through signaling interaction. And further forming a new data transmission channel, and finally connecting the user to the network by matching the slice flow table to form the new data transmission plane.
The invention has the beneficial effects that:
1) the flow table in the SDN architecture is expanded into a wireless access network, the SDN controller is used for controlling the slice flow table, and the data forwarding is matched and forwarded through the slice flow table, so that the separation of data forwarding and a control plane is realized. The matching field of the slice flow table mainly comprises an RRH field and a BBU field, and the two parts respectively correspond to a physical layer of a wireless access network, network parameters related to a second layer and a third layer, a forwarding flow and a port.
2) The slicing mode is divided into the following modes according to different slicing network generation triggering conditions: static slicing mode, dynamic slicing mode, and semi-static slicing mode. The method mainly realizes that the SDN controller modifies the network slice flow table and matches the data flow with the slice flow table so as to realize the forwarding of the data flow, and the method well realizes the separation of network control and data forwarding. In addition, through the control of the SDN controller, the modification of relevant attributes of slice flow tables of different slice networks can be quickly and conveniently realized, so that the specificity of each slice network can be better distinguished, differential configuration can be carried out on each slice network, and the maintenance of each slice network is also facilitated.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, 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 scope of the invention as defined by the appended claims.
Claims (5)
1. A wireless network slicing method based on a slice flow table, the method comprising:
expanding an Openflow slice flow table in an SDN architecture into a wireless access network, wherein a matching field of the slice flow table comprises a remote transmitting head RRH field and a baseband processing unit BBU field;
generating at least one slicing network according to different slicing triggering conditions; the slicing network comprises a static slicing network, a dynamic slicing network and a semi-static slicing network;
the static sliced network is generated as follows:
an operator or a service provider sends a slicing request to the SDN controller through an Application Programming Interface (API);
the SDN controller generates slice flow table data according to a network slice strategy;
the SDN controller modifies slice flow table information in the BBU and the RRH to form a new slice network;
establishing a data transmission channel, and matching the data transmission channel with a slice flow table to form a data forwarding plane when a user needs to access the new slice network;
the dynamic sliced network is generated as follows:
a network slicing request sent by a user is reported to the SDN controller through the RRH;
the SDN controller forms a slice flow table parameter according to current network state information and a slice generation strategy;
the SDN controller modifies slice flow tables of the RRH and the BBU through signaling interaction;
the user establishes a data forwarding plane according to the matching slice flow table;
the semi-static sliced network is generated as follows:
in the existing static sliced network, if a new network slicing request sent by a user occurs, a new network is generated according to a mode of generating a dynamic sliced network.
2. The slicing flow table based wireless network slicing method of claim 1, wherein the RRH field comprises:
an entity RRH physical identification; an RRH physical port; the transmit power of the base station; the number of base station antennas; a modulation coding strategy; a channel propagation model; propagating the frame structure; an entity Fronthaul physical identity; a frontaul physical port; delay bound of Fronthaul; capacity limitation of Fronthaul.
3. The slicing flow table based wireless network slicing method of claim 1 wherein the BBU field comprises:
physical BBU identification; a BBU physical port; a resource scheduling mode; configuring a protocol stack; the amount of bandwidth allocation.
4. The slice flow table based wireless network slicing method of claim 1 wherein extending Openflow slice flow tables in an SDN architecture into a wireless access network comprises:
at least one slice flow table is added in each access network entity.
5. The slicing flow table based wireless network slicing method of claim 1 wherein the method further comprises:
controlling the slice flow table through an SDN controller, and forwarding data through matching forwarding of the slice flow table to realize separation of data forwarding and a control plane.
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