US20200244571A1 - Control node and path control system - Google Patents
Control node and path control system Download PDFInfo
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- US20200244571A1 US20200244571A1 US16/845,452 US202016845452A US2020244571A1 US 20200244571 A1 US20200244571 A1 US 20200244571A1 US 202016845452 A US202016845452 A US 202016845452A US 2020244571 A1 US2020244571 A1 US 2020244571A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/54—Organization of routing tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/033—Topology update or discovery by updating distance vector protocols
Abstract
A C-plane device in a path control system comprises: a storage unit storing designation information designating search key information of a node used as a search key determining a transmission destination and part information indicating a packet part in which the search key information is included; and a setting unit, in a case in which a new node is connected to the U-plane device, acquires node information relating to the new node, extracts search key information of the new node on the basis of the acquired node information and the stored to designation information, and, in a case in which, in a packet received by the U-plane device, the search key information of the new node is included in a packet part indicated by the part information, sets a transmission destination of the packet for each of at least a part of U-plane devices.
Description
- This application is a division of and claims the benefit of priority under 35 U.S.C. § 120 from U.S. application Ser. No. 16/063,340 filed Jun. 18, 2018, the entire contents of which are incorporated herein by reference. U.S. application Ser. No. 16/063,340 is a National Stage of PCT/JP2017/005103 filed Feb. 13, 2017, which claims the benefit of priority under 35
U.S.C. § 119 from Japanese Application No. 2016-032098 filed Feb. 23, 2016. - The present invention relates to a control node performing path control of packet communication between nodes and a path control system comprising one or more relay nodes that are connected to the control node and relay packet communication.
- Conventionally, communication systems performing path control in an evolved packet system (EPS) that is a standard of a mobile communication network are known (for example, Patent Literature 1).
- Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2014-236234
- However, in the EPS, there are problems in that path control using identification information designated by a network company and a packet field designated by the network company cannot be performed, and flexible path control cannot be performed.
- Thus, the present invention is in consideration of such problems, and an object thereof is to provide a control node and a path control system capable of performing more flexible path control.
- In order to solve the problems described above, according to one aspect of the present invention, there is provided a control node in a path control system comprising the control node performing path control of packet communication between nodes and one or more relay nodes that are connected to the control node and relay the packet communication, the control node comprising: a memory storing designation information designating search key information of a node used as a search key determining a transmission destination that is a relay destination when one of the one or more relay nodes receives a packet and part information indicating a packet part in which the search key information is included. The control node, in a case in which a new node is connected to at least one of the one or more relay nodes, acquires node information relating to the new node, extracts search key information of the new node on the basis of the acquired node information and the designation information stored in the memory, and, in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information of the new node is included in a packet part indicated by the part information, sets a transmission destination of the packet for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission.
- By employing such a configuration, in a case in which a new node is connected to at least one of the one or more relay nodes and in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information of the new node based on the designation information stored in the memory is included in a packet part indicated by the part information, a transmission destination of the packet is set for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission. In other words, on the basis of the designation information and the part information stored in the memory, a transmission destination of a packet for each relay node can be set. Accordingly, for example, when designation information and part information designated by a network company are stored in the memory, path control can be performed using the designation information and the part information designated by the network company. In other words, more flexible path control can be performed.
- In addition, in the control node according to one aspect of the present invention, a plurality of pieces of search key information may be extracted when the search key information is extracted, and a transmission destination may be set for each of the plurality of pieces of extracted search key information. By employing such a configuration, a plurality of pieces of search key information can be set for the node, and thus, for example, more flexible path control such as setting a plurality of pieces of search key information in accordance with purposes and setting path control in accordance with the purposes can be performed.
- In addition, in the control node according to one aspect of the present invention, insufficiency information may be dynamically generated when the search key information is extracted. By employing such a configuration, even in a case in which insufficiency information is present, search key information can be extracted more reliably, and accordingly, a transmission destination of the relay node can be set more reliably.
- In addition, in the control node according to one aspect of the present invention, the memory may further store topology information relating to network topology of the one or more relay nodes, and the control node may set a transmission destination on the basis of the topology information stored in the memory. By employing such a configuration, for example, a transmission destination forming a shortest path toward a transmission destination node can be set on the basis of the topology information, and more flexible path control can be performed.
- In addition, in the control node according to one aspect of the present invention, the packet communication may be performed through one virtual network among a plurality of virtual networks established on a path, the memory may store designation information and part information for each of the virtual networks, and the control node, in a case in which a new node is connected to at least one of the one or more relay nodes, acquires node information relating to the new node, extracts search key information for each virtual network of the new node on the basis of the acquired node information and the designation information for each virtual network stored in the memory, and, in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information for the virtual network of the new node is included in a packet part indicated by the part information for each virtual network, may set a transmission destination of the packet for each virtual network and for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission. By employing such a configuration, in a packet communication network in which a plurality of virtual networks are established on a path, path control for each virtual network can be performed. In other words, more flexible path control can be performed.
- In addition, in order to solve the problems described above, according to one aspect of the present invention, there is provided a path control system comprising: a control node performing path control of packet communication between nodes; and one or more relay nodes that are connected to the control node and relay the packet communication. The control node comprises a first memory storing designation information designating search key information of a node used as a search key determining a transmission destination that is a relay destination when one of the one or more relay nodes receives a packet and part information indicating a packet part in which the search key information is included and, in a case in which a new node is connected to at least one of the one or more relay nodes, acquires node information relating to the new node, extracts search key information of the new node on the basis of the acquired node information and the designation information stored in the first memory, and, in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information of the new node is included in a packet part indicated by the part information, generates a settings data table in which a transmission destination of the packet is set for at least a part of the one or more relay nodes or for each of all the relay nodes in a transmission path of the packet transmission and transmits the generated settings data table to the set relay node, and the relay node comprises a second memory storing the settings data table transmitted by the control node and transmits a packet received at the time of relaying on the basis of the settings data table stored in the second memory.
- By employing such a configuration, in the control node, in a case in which a new node is connected to at least one of the one or more relay nodes and in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information of the new node based on the designation information stored in the first memory is included in a packet part indicated by the part information, a settings data table in which a transmission destination of the packet is set for at least a part of the one or more relay nodes or for each of all the relay nodes present in a transmission path of the packet transmission is generated. Then, in the relay node, the generated settings data table is stored in the second memory, and a packet received at the time of relaying is transmitted on the basis of the settings data table stored in the second memory. In other words, on the basis of the settings data table generated on the basis of the designation information and the part information stored in the first memory, a packet is transmitted in the relay node. Accordingly, for example, when designation information and part information designated by a network company are stored in the first memory, path control can be performed using the designation information and the part information designated by the network company. In other words, more flexible path control can be performed.
- More flexible path control can be performed.
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FIG. 1 is a configuration diagram of a path control system according to an embodiment of the present invention. -
FIG. 2 is a diagram illustrating the hardware configuration of a control node according to an embodiment of the present invention. -
FIG. 3 is a diagram illustrating the hardware configuration of a relay node according to an embodiment of the present invention. -
FIG. 4 is a diagram illustrating examples of a packet search rule table, a topology information table, and a UN specific information table. -
FIG. 5 is a diagram illustrating an example of a settings data table. -
FIG. 6 is a sequence diagram illustrating a path control method in a path control system according to an embodiment of the present invention. -
FIG. 7 is a flowchart illustrating a process of S3 illustrated inFIG. 6 in detail. -
FIG. 8 is a diagram illustrating a specific configuration of a path control system of an example. -
FIG. 9 is a sequence diagram illustrating an order in which a settings data table is set in each relay node in an example. -
FIG. 10 is a diagram illustrating an example of a packet transmitted from a node that is a transmission source in an example. -
FIG. 11 is a sequence diagram (1) illustrating an order in which a packet is transmitted in a relay node in which a settings data table is set in an example. -
FIG. 12 is a sequence diagram (2) illustrating an order in which a packet is transmitted in a relay node in which a settings data table is set in an example. -
FIG. 13 is a diagram illustrating a specific configuration of a path control system according to Modified example 1. -
FIG. 14 is a diagram illustrating examples of a packet search rule table, a topology information table, and a UN specific information table in Modified example 1. -
FIG. 15 is a diagram illustrating an example of a settings data table in Modified example 1. -
FIG. 16 is a sequence diagram (1) illustrating an order in which a settings data table is set in each relay node in Modified example 1. -
FIG. 17 is a sequence diagram (2) illustrating an order in which a settings data table is set in each relay node in Modified example 1. -
FIG. 18 is a sequence diagram (3) illustrating an order in which a settings data table is set in each relay node in Modified example 1. -
FIG. 19 is a diagram illustrating an example of a packet transmitted from a node that is a transmission source in Modified example 1. -
FIG. 20 is a sequence diagram (1) illustrating an order in which a packet is transmitted in a relay node in which a settings data table is set in Modified example 1. -
FIG. 21 is a sequence diagram (2) illustrating an order in which a packet is transmitted in a relay node in which a settings data table is set in Modified example 1. -
FIG. 22 is a diagram illustrating a specific configuration of a path control system of Modified example 2. -
FIG. 23 is a diagram illustrating examples of a packet search rule table, a topology information table, and a UN specific information table in Modified example 2. -
FIG. 24 is a flowchart illustrating the process of S3 illustrated inFIG. 6 in detail in Modified example 2. -
FIG. 25 is a diagram illustrating an example of a settings data table in Modified example 2 (initial state). -
FIG. 26 is a diagram illustrating an example of a settings data table in Modified example 2. - Hereinafter, a control node and a path control system according to an embodiment will be described in detail with reference to the drawings. In description of the drawings, the same reference signs will be assigned to the same elements, and duplicate description thereof will not be presented.
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FIG. 1 is a system configuration diagram of a path control system 4 (path control system) according to an embodiment of the present invention. As illustrated inFIG. 1 , thepath control system 4 is configured to include a C-plane device 1 (control node), one or more U-plane devices 2 (relay nodes), and one or more UNs 3 (nodes). Hereinafter, the one or moreU-plane devices 2 will be collectively referred to as aU-plane device 2 as is appropriate, and the one ormore UNs 3 will be collectively referred to as aUN 3 as is appropriate. - The C-
plane device 1 is connected to the one or moreU-plane devices 2 through a network for enabling packet communication. Some or all ofU-plane devices 2 among the one or moreU-plane devices 2 are connected such that theU-plane devices 2 can perform mutual packet communication through a network. Each of the one ormore UNs 3 can be connected to oneU-plane device 2 among the one or moreU-plane devices 2 through a network to enable mutual packet communication and can appropriately disconnect the communication or update the connection state. A packet-communicable network of the wholepath control system 4 is constituted by using the C-plane device 1 and the network between theU-plane devices 2 and theUN 3 described above. Thepath control system 4, for example, may be a mobile communication system using an evolved packet system (EPS). - In this embodiment, mainly, path control of packet communication between
UNs 3 is described. More specifically, the packet communication betweenUNs 3 is communication of packets transmitted from aUN 3 that is a transmission source to aUN 3 that is a transmission destination. The communication between the UNs 3 (nodes) is relayed by one or moreU-plane devices 2. AUN 3 that is a transmission source, first, transmits a packet to aU-plane device 2 that is directly connected. TheU-plane device 2 that has transmitted the packet determines a transmission destination of the packet (a determining method will be described later) and transmits the packet to the determined transmission destination. The transmission destination is anotherU-plane device 2 or aUN 3 that is a transmission destination. In this way, a packet transmitted from aUN 3 that is a transmission source is relayed through one or moreU-plane devices 2 and finally arrives at aUN 3 that is a transmission destination. A network (including aUN 3 and a U-plane device 2) traced by a packet from theUN 3 that is a transmission source to aUN 3 that is a transmission destination is called a path. - The C-plane (control plane)
device 1 is a computer device (one node in a network) performing network control such as path control of packet communication betweenUNs 3 that is relayed by theU-plane device 2. The C-plane device 1, for example, is a home subscriber server (HSS), a mobility management entity (MME), a policy and charging rule function (PCRF), or the like in an EPS. Details of the C-plane device 1 will be described later. - The U-plane (user plane)
device 2 is a computer device (one node in a network) relaying packet communication betweenUNs 3 and, more specifically, is a computer device that performs packet transmission or a packet process of a network. TheU-plane device 2, for example, is an evolved node B (eNB), a serving gateway (SGW), a packet data network gateway (PGW), or the like that is a node system in an EPS. Details of theU-plane device 2 will be described later. - The UN (user network) 3 collectively refers to hardware and software connected to a network constituted by the
path control system 4 and groups constituted thereby (one node in a network). TheUN 3, for example, may be a portable terminal, a network configured from a plurality of devices, a virtual terminal or an application operating on a portable terminal, a network managed by another network company different from a network company managing the C-plane device 1 and theU-plane devices 2, or the Internet that is connected through a network managed by another network company. - Hereinafter, each functional block of the C-
plane device 1 will be described on the basis of a functional block diagram of the C-plane device 1 included inFIG. 1 . As illustrated inFIG. 1 , the C-plane device 1 is configured to include: a storage unit 10 (a memory or a first memory); anacquisition unit 11; and asetting unit 12. - The C-
plane device 1 is configured from hardware such as a CPU and the like.FIG. 2 is a diagram illustrating one example of the hardware configuration of the C-plane device 1. The C-plane device 1 illustrated inFIG. 1 , physically, as illustrated inFIG. 2 , is configured as a computer system including: one or a plurality ofCPUs 100; aRAM 101 and aROM 102 that are main memory devices; an input/output device 103 such as a display; acommunication module 104; anauxiliary memory device 105; and the like. - The function of each functional block of the C-
plane device 1 illustrated inFIG. 1 is realized by operating the input/output device 103, thecommunication module 104, and theauxiliary memory device 105 under the control of theCPU 100 and reading and writing data from/into theRAM 101 by causing predetermined computer software to be read onto hardware such as theCPU 100, theRAM 101, and the like illustrated inFIG. 2 . - In addition, each function may be configured to be executed by building all or some of the functions into a dedicated integrated circuit (IC) instead of executing each function illustrated in
FIG. 1 using a processor such as theCPU 100. For example, by building a dedicated integrated circuit for performing image processing or communication control, the functions described above may be executed. - It is apparent that the software is broadly interpreted to mean a command, a command set, a code, a code segment, a program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, an execution thread, an order, a function, and the like regardless whether it is called software, firmware, middleware, a micro-code, a hardware description language, or any other name.
- In addition, the software, the command, and the like may be transmitted and received through a transmission medium. For example, in a case in which software is transmitted from a website, a server, or another remote source using a wired technology such as a coaxial cable, an optical fiber cable, a twisted pair, or a digital subscriber line (DSL) and/or a wireless technology such as infrared rays or microwaves, the wired technology and/or the wireless technology are included within the definition of the transmission medium.
- The
storage unit 10 stores designation information used for designating search key information of theUN 3 that is used as a search key of determination of a transmission destination by theU-plane device 2 at the time of relaying a packet and part information indicating a packet part (for example, a packet field) in which the search key information is included. As will be described later, theU-plane device 2 determines a specificU-plane device 2 or a UN 3 (of a transmission destination) to which a packet is to be transmitted next at the time of relaying the received packet. In other words, a transmission destination is determined. The determination is performed on the basis of the search key information of the UN 3 (of the transmission destination) included in the received packet.FIG. 4(a) is a diagram illustrating an example of a packet search rule table in which the part information and the designation information stored using thestorage unit 10 are associated with each other. In the table example illustrated inFIG. 4(a) , the part information is “64 bits from the start of a user packet part.” This indicates that a packet part in which search key information is included is the part having 64 bits from the start of the user packet part included in a packet. In the table example illustrated inFIG. 4(a) , the designation information is “UN 3 identification code.” This indicates designation of the use of aUN 3 identification code (an independent code used for identifying theUN 3; in this embodiment, a code of 64 bits) as search key information of theUN 3. - The designation information and the part information are assumed to be designated by a network company managing the
path control system 4. For example, the C-plane device 1 may receive the designation information and the part information from a network company through the input/output device 103 as inputs and stores the input information using thestorage unit 10. - The
storage unit 10 may further store topology information relating to a network topology of one or moreU-plane devices 2. More specifically, the network topology of one or moreU-plane devices 2 is a connection form representing a manner in which theU-plane devices 2 are connected inside thepath control system 4.FIG. 4(b) is a diagram illustrating an example of a topology information table stored using thestorage unit 10. In the table example illustrated inFIG. 4(b) , one record corresponds to a set of identifiers used for identifyingU-plane devices 2 and represents that theU-plane devices 2 identified using the set of identifiers are connected together (have a connection relation). More specifically, in the table example illustrated inFIG. 4(b) , in thepath control system 4, it represents that a U-plane device 2-1 and a U-plane device 2-2 are connected, and a U-plane device 2-3 and the U-plane device 2-2 are connected. - In addition to the information described above, the
storage unit 10 may store information that is temporarily generated or output information at the time of processing using theacquisition unit 11 and thesetting unit 12 to be described later. - When a new UN 3 (a
UN 3 that is not connected to any one ofU-plane devices 2 included in the path control system 4) is connected to aU-plane device 2 or when the connection state of aUN 3 is updated, theacquisition unit 11 acquires node information relating to theUN 3. Theacquisition unit 11 acquires the node information through aconnection processing unit 21 of theU-plane device 2 to be described later. In the node information, UN specific information that is specific information of theUN 3 is included. The UN specific information may include all the information that is specific in particular to a user device maintained in software or hardware among specific information of theUN 3, for example, aUN 3 identifier used for identifying theUN 3, theUN 3 identification code described above and information used when theUN 3 is connected to a network constituted by thepath control system 4. For example, the UN specific information may include an identifier of theU-plane device 2 to which theUN 3 is connected. Theacquisition unit 11 outputs the acquired node information to thesetting unit 12. - The setting
unit 12 extracts search key information of theUN 3 on the basis of the node information input from theacquisition unit 11 and the designation information stored using thestorage unit 10. In a case in which the designation information stored using thestorage unit 10 is the table example illustrated inFIG. 4(a) , as described above, the use of theUN 3 identification code is designated as the search key information of theUN 3, and accordingly, the settingunit 12 extracts aUN 3 identification code included in the node information input from theacquisition unit 11. - When search key information is extracted, the setting
unit 12 may extract a plurality of pieces of search key information. For example, in the specific example described above, in a case in which a plurality ofUN 3 identification codes are included in the node information input from theacquisition unit 11, the settingunit 12 extracts the plurality ofUN 3 identification codes. - The setting
unit 12 may dynamically generate insufficiency information when the search key information which is insufficient is extracted. In addition, the settingunit 12 may dynamically generate insufficiency information when search key information which is extracted on the basis of the node information and the designation information is insufficient. For example, in the specific example described above, in a case in which aUN 3 identification code included in the node information input from theacquisition unit 11 is not the original code of 64 bits but a code of 32 bits representing the same numerical value, the settingunit 12 converts the code of 32 bits into a code of 64 bits (32 “0”s that are insufficiency information are dynamically generated and added). As another example, the insufficiency information may be generated using a method of assigning a value that is larger than a largest value of theUN 3 identification code, which has already been assigned to theUN 3, by one. In addition, as a yet another example, an embodiment may be conceived in which assignment of aUN 3 identification code is requested for an external C-plane device 1 controlling theUN 3, and the value of theUN 3 identification code included in a response thereof is used. - The setting
unit 12 may generate a UN specific information table in which an identifier of aUN 3, an identifier of aU-plane device 2 to which theUN 3 is connected, and search key information are associated with each other or update a record relating to aUN 3 that is newly connected for a UN specific information table stored in advance on the basis of the extracted search key information and the node information input from theacquisition unit 11. For example, when anew UN 3 is connected to theU-plane device 2, the settingunit 12 may acquire an identifier of theUN 3 included in the node information input from theacquisition unit 11 and an identifier of theU-plane device 2 and generates or updates a UN specific information table by associating these with each piece of the extracted search key information.FIG. 4(c) is a diagram that illustrates an example of the UN specific information table. In the table example illustrated inFIG. 4(c) , for example, a first record represents that aUN 3 of which the identifier is “UN 3-1” is connected to aU-plane device 2 of which the identifier is “U-plane device 2-1,” and search key information (UN 3 identifier code) of theUN 3 is “0x 0000 0000 0000 0001.” The settingunit 12 may store the UN specific information table that has been generated or updated using thestorage unit 10. - Subsequently, the setting
unit 12 generates a settings data table in which a transmission destination of a packet of a case, in which extracted search key information is included in a packet part, which indicated by part information stored using thestorage unit 10, of the packet received when theU-plane device 2 performs packet relay, is set for eachU-plane device 2. The settingunit 12 may store the generated settings data table using thestorage unit 10. In addition, the settingunit 12 may generate the settings data table for at least a part of theU-plane devices 2 or each of all theU-plane devices 2 present in a transmission path of the packet transmission. Hereinafter, a method of generating the settings data table using thesetting unit 12 will be described more specifically. - More specifically, the setting
unit 12 generates an example of a settings data table illustrated inFIG. 5 on the basis of the examples of the packet search rule table, the topology information table and the UN specific information table illustrated inFIG. 4 . In the example of the settings data table illustrated inFIG. 5 , an identifier of aU-plane device 2, a packet search condition (to be described later), and an identifier of a transmission destination device are associated with each other. Hereinafter, a method of acquiring information of each column of the example of the settings data table illustrated inFIG. 5 will be described. - First, the setting
unit 12 extracts identifiers ofU-plane devices 2 from the topology information table without any duplication and sets the identifiers in the first column of the example of the settings data table illustrated inFIG. 5 . The settingunit 12 may extract the identifiers of theU-plane devices 2 not from the topology information table but on the basis of the identifiers of all theU-plane devices 2, to which the C-plane device 1 is connected, stored in the C-plane device 1 in advance. - Next, the setting
unit 12 generates a packet search condition acquired by combining the part information of the pack search rule table and the identification information (search key information) of eachUN 3 included in the UN specific information table and sets the generated packet search condition in the second column of the example of the settings data table illustrated inFIG. 5 for each ofU-plane devices 2 of the first column. - In the example of the settings data table at this time point illustrated in
FIG. 5 , the “U-plane device 2 identifier” of the first column represents aU-plane device 2 that is a subject relaying a packet, and the “packet search condition” of the second column represents a search condition satisfied by the packet when theU-plane device 2 relays the packet. For example, a first record represents a case in which 64 bits from the start of a user packet part of a packet received by a U-plane device 2-1 are “0x 0000 0000 0000 0001,” in other words, a case in which aUN 3 that is a transmission destination is a UN 3-1. In the case of this first record, the settingunit 12 refers to the UN specific information table and determines that the U-plane device 2-1 and the UN 3-1 are connected and sets “UN 3-1” as an identifier of a transmission destination device of the third column. In addition, the packet search condition uses at least the part information and the search key information. - The setting
unit 12 may set a transmission destination on the basis of the topology information stored using thestorage unit 10. For example, a second record of the example of the settings data table illustrated inFIG. 5 represents a case in which the transmission destination of a packet received by the U-plane device 2-1 is a UN 3-2. In the case of this second record, the settingunit 12, first, determines that a device to which the UN 3-2 is connected is a U-plane device 2-2 by referring to the UN specific information table and, next, determines that the determined U-plane device 2-2 and the U-plane device 2-1 that is its own device are connected by referring to the topology information table. Thus, the settingunit 12, determines that, in order to transmit a packet received by the U-plane device 2-1 to the UN 3-2 that is a transmission destination, first, it is necessary to transmit the packet to the U-plane device 2-2 and sets a “U-plane device 2-2” as an identifier of a transmission destination device of the third column. In addition, when the transmission destination is set, the settingunit 12 may calculate and set a transmission destination device that is a shortest path toward theUN 3 that is the transmission destination using a Dijkstra's algorithm, which is a known technology, or the like on the basis of the topology information table and the UN specific information table. - The setting
unit 12 may set a transmission destination for each of a plurality of pieces of extracted search key information. For example, in the example of the UN specific information table illustrated inFIG. 4(c) , twoUN 3 identification codes (“0x 0000 0000 0000 0002” and “0x 0000 0000 0000 0005”) are set for the U-plane device 2-2, and, on the basis of the UN specific information table, in the example of the settings data table illustrated inFIG. 5 , transmission destinations are set by the settingunit 12 for the twoUN 3 identification codes (for example, the second record and the fifth record). The method of generating the settings data table using thesetting unit 12 is as described above. - The setting
unit 12 performs setting by transmitting the generated settings data table to eachU-plane device 2. The settingunit 12 may transmit the generated settings data table to all theU-plane devices 2 or may transmit a record for eachU-plane device 2 in the generated settings data table to theU-plane device 2. (For example, all the records in which the first column is the “U-plane device 2-1” in the settings data table are transmitted to the U-plane device 2-1, and all the records of the “U-plane device 2-2” are transmitted to the U-plane device 2-2, and the like). - Subsequently, referring back to
FIG. 1 , each functional block of theU-plane device 2 will be described on the basis of the functional block diagram of theU-plane device 2 included inFIG. 1 . As illustrated inFIG. 1 , theU-plane device 2 is configured to include a storage unit 20 (a memory or a second memory), aconnection processing unit 21, and atransmission unit 22. - The
U-plane device 2 is configured from hardware such as a CPU and the like.FIG. 3 is a diagram illustrating one example of the hardware configuration of theU-plane device 2. TheU-plane device 2 illustrated inFIG. 1 , physically, as illustrated inFIG. 3 , is configured as a computer system including: one or a plurality ofCPUs 200; aRAM 201 and aROM 202 that are main memory devices; an input/output device 203 such as a display; acommunication module 204; anauxiliary memory device 205; and the like. - The function of each functional block of the
U-plane device 2 illustrated inFIG. 1 is realized by operating the input/output device 203, thecommunication module 204, and theauxiliary memory device 205 under the control of theCPU 200 and reading and writing data from/into theRAM 201 by causing predetermined computer software to be read onto hardware such as theCPU 200, theRAM 201, and the like illustrated inFIG. 3 . - In addition, each function may be configured to be executed by building all or some of the functions into a dedicated integrated circuit (IC) instead of executing each function illustrated in
FIG. 1 using a processor such as theCPU 200. For example, by building a dedicated integrated circuit for performing image processing or communication control, the functions described above may be executed. - The
storage unit 20 stores a settings data table transmitted by the settingunit 12. In addition, the settings data table transmitted by the settingunit 12 may be received by a reception unit not illustrated in the drawing, and the received settings data table may be stored by thestorage unit 20. - The
connection processing unit 21 performs a process of connecting with theUN 3. More specifically, theconnection processing unit 21 receives a new connection request from theUN 3 or receives a request for updating a connection state in the connection state of already being connected with theUN 3. Then, when a connection request or an update request is received, theconnection processing unit 21 establishes a connection with theUN 3. In addition, when the connection request or the update request is received, theconnection processing unit 21 receives the node information described above from theUN 3. In addition, theconnection processing unit 21 may receive information of a part of the node information from theUN 3 and generate node information on the basis of the information of the part. Theconnection processing unit 21 transmits the node information that has been received or generated to theacquisition unit 11 of the C-plane device 1. - The
transmission unit 22 transmits a packet that has been received at the time of relaying the packet on the basis of the settings data table stored using thestorage unit 20. More specifically, thetransmission unit 22, first, acquires records in which the identifier of theU-plane device 2 is the identifier of its own device in the settings data table stored using thestorage unit 20. Next, thetransmission unit 22 extracts a record satisfying a packet search condition included in a record among the acquired records for the packet transmitted from a transmission source device (anotherU-plane device 2 or the UN 3) and acquires an identifier of a transmission destination device of the record. Then, thetransmission unit 22 transmits the packet to the transmission destination device corresponding to the acquired identifier of the transmission destination device. -
FIG. 6 is a sequence diagram illustrating a path control method in thepath control system 4. First, by using thestorage unit 10 of the C-plane device 1, the topology information table and the UN specific information table are stored together with a packet search rule table input by a network company or the like (Step S0). Next, by using theUN 3, a connection request or an update request including UN specific information of theUN 3 is transmitted to theU-plane device 2, and a connection process for a connection with theUN 3 is performed using theconnection processing unit 21 of the U-plane device 2 (Step S1). Next, by using theconnection processing unit 21 of theU-plane device 2, the UN specific information received in S1 is transmitted to the C-plane device 1, the UN specific information is acquired using theacquisition unit 11 of the C-plane device 1, and the UN specific information acquired using thesetting unit 12 of the C-plane device 1 is added to the UN specific information table (Step S2). - Next, by using the
setting unit 12 of the C-plane device 1, a settings data table is generated on the basis of the packet search rule table and the topology information table stored in S0 and the UN specific information table updated in S2 (Step S3). Next, by using thesetting unit 12 of the C-plane device 1, the settings data table generated in S3 is transmitted to (set in) the U-plane device 2 (Step S4). Next, by using thestorage unit 20 of theU-plane device 2, the settings data table transmitted in S4 is stored, and, by using thetransmission unit 22, a process of transmitting a packet on the basis of the stored settings data table is performed (Step S5). -
FIG. 7 is a flowchart illustrating the process of S3 in the sequence diagram illustrated inFIG. 6 in detail. First, after S2 illustrated inFIG. 6 , by using thesetting unit 12, it is determined whether or not UN specific information that is dynamically generated is present on the basis of the UN specific information acquired in S2 illustrated inFIG. 6 (Step S10). When the presence is determined in S10, by using thesetting unit 12, insufficient UN specific information is generated (Step S11). In a case in which no presence is determined in S10, or following S11, by using thesetting unit 12, designation information of the packet search rule table is substituted with the UN specific information that is acquired in S2 illustrated inFIG. 6 or the UN specific information that is dynamically generated in S11, and a packet search condition is generated (Step S12). - Next, by using the
setting unit 12, for eachU-plane device 2, a transmission destination device forming a shortest path toward theUN 3 to which search key information based on the UN specific information of theUN 3 acquired in S2 is assigned is calculated (Step S13). Next, by using thesetting unit 12, for eachU-plane device 2, a record including the identifier of theU-plane device 2, the packet search condition generated in S12, and the identifier of the transmission destination device forming the shortest path calculated in S13 is generated and is added to the settings data table stored using the storage unit 10 (Step S14). After S14, the process proceeds to S4 illustrated inFIG. 6 . - Subsequently, example of the
path control system 4 will be described. In this example, a setting order of the settings data table will be described using a sequence diagram illustrated inFIG. 9 on the basis of a specific configuration example of thepath control system 4 illustrated inFIG. 8 , and, a transmission order of each packet illustrated inFIG. 10 will be described using a sequence diagram illustrated inFIGS. 11 and 12 on the basis of a set settings data table. -
FIG. 8 is a diagram illustrating a specific configuration of thepath control system 4 of this example. As illustrated inFIG. 8 , a UN 3-1 is connected to a U-plane device 2-1 (connected in S25 illustrated inFIG. 9 to be described later), a UN 3-2 is connected to a U-plane device 2-2 (connected in S21 illustrated inFIG. 9 to be described later), a UN 3-3 is connected to a U-plane device 2-3 (connected in S29 illustrated inFIG. 9 to be described later), and a UN 3-4 is connected to a U-plane device 2-3 (connected in S33 illustrated inFIG. 9 to be described later). In addition, the U-plane device 2-1 and the U-plane device 2-2 are connected, and the U-plane device 2-2 and the U-plane device 2-3 are connected. Furthermore, a C-plane device 1 is connected to each of the U-plane device 2-1, the U-plane device 2-2, and the U-plane device 2-3. In addition, the configuration illustrated inFIG. 8 is a configuration based on the example of the topology information table illustrated inFIG. 4(b) and the example of the UN specific information table illustrated inFIG. 4(c) . Furthermore, the C-plane device 1 is configured to include thestorage unit 10, theacquisition unit 11, and thesetting unit 12 that are the functional blocks described above, and eachU-plane device 2 is configured to include thestorage unit 20, theconnection processing unit 21, and thetransmission unit 22 that are the functional blocks described above. -
FIG. 9 is a sequence diagram illustrating an order in which anew UN 3 is connected to theU-plane device 2, and a settings data table based on the connection is set in eachU-plane device 2. InFIG. 9 , S20 to S24 correspond to details when S0 to S4 illustrated inFIG. 6 are executed at a time when a new UN 3-2 is connected to a U-plane device 2-2, and thus, detailed description thereof will not be presented here. In addition, in S24, a settings data table is transmitted to all theU-plane devices 2 included in thepath control system 4 using the C-plane device 1. Similarly, S25 to S28 inFIG. 9 correspond to details when S0 to S4 illustrated inFIG. 6 are executed at a time when a new UN 3-1 is connected to a U-plane device 2-1, S29 to S32 inFIG. 9 correspond to details when S0 to S4 illustrated inFIG. 6 are executed at a time when a new UN 3-3 is connected to a U-plane device 2-3, and S33 to S36 inFIG. 9 correspond to details when S0 to S4 illustrated inFIG. 6 are executed at a time when a new UN 3-4 is connected to a U-plane device 2-3. In addition, a settings data table that is finally set in S36 is assumed to be the table example illustrated inFIG. 5 . -
FIG. 10 is a diagram illustrating an example of a packet transmitted from aUN 3 that is a transmission source. As illustrated inFIG. 10 , aUN 3 identification code of 64 bits is included in the first 64 bits of a packet (hereinafter, referred to as a user packet part), and the remaining part is a payload part. In addition, theUN 3 identification code represents aUN 3 that is the transmission destination. A packet example illustrated inFIG. 10(a) illustrates a packet transmitted in the process (S40 to S44) of “a” of a sequence diagram illustrated inFIG. 11 to be described later. Similarly, a packet example illustrated inFIG. 10(b) illustrates a packet transmitted in the process (S45 to S49) of “b” of the sequence diagram illustrated inFIG. 11 , a packet example illustrated inFIG. 10(c) illustrates a packet transmitted in the process (S50 to S54) of “c” of the sequence diagram illustrated inFIG. 11 , a packet example illustrated inFIG. 10(d) illustrates a packet transmitted in the process (S55 to S59) of “d” of the sequence diagram illustrated inFIG. 11 , and a packet example illustrated inFIG. 10(e) illustrates a packet transmitted in the process (S60 to S64) of “e” of the sequence diagram illustrated inFIG. 11 . - Each of
FIGS. 11 and 12 is a sequence diagram illustrating an order in which a packet in aU-plane device 2 set in a settings data table is transmitted. First, the process of “a” illustrated inFIG. 11 will be described. First, a packet illustrated inFIG. 10(a) is transmitted from the UN 3-2 to the U-plane device 2-2 directly connected to the UN 3-2 (Step S40). Next, the set settings data table is referred to by the U-plane device 2-2, and it is determined that an 11-th record of the table example illustrated inFIG. 5 satisfies a search condition that the identifier of theU-plane device 2 is “U-plane device 2-2” of its own device, and 64 bits from the start of the user packet part are “0x 0000 0000 0000 0001” like the packet illustrated inFIG. 10(a) as a packet search condition (Step S41). Next, by using the U-plane device 2-2, the packet is transmitted to the U-plane device 2-1 represented by the identifier of the transmission destination device of the 11-th record (Step S42). - Next, the set settings data table is referred to by the U-plane device 2-1, and it is determined that a first record of the table example illustrated in
FIG. 5 satisfies a search condition that the identifier of theU-plane device 2 is “U-plane device 2-1” of its own device, and 64 bits from the start of the user packet part are “0x 0000 0000 0000 0001” like the packet illustrated inFIG. 10(a) as a packet search condition (Step S43). Next, by using the U-plane device 2-1, the packet is transmitted to the UN 3-1 represented by the identifier of the transmission destination device of the first record (Step S44). - The process of “b” illustrated in
FIG. 11 and the process of “c” to “e” illustrated inFIG. 12 are similar to that described above, and thus, description thereof will not be presented here. In addition, a 2nd record satisfies the search condition in S46, a 12-th record satisfies the search condition in S48, a 13-th record satisfies the search condition in S51, an 8-th record satisfies the search condition in S53, a 14-th record satisfies the search condition in S56, a 9-th record satisfies the search condition in S58, a 5-th record satisfies the search condition in S61, and a 15-th record satisfies the search condition in S63. - Subsequently, Modified example 1 of the example of the
path control system 4 described above will be described. In this Modified example 1, packet communication is performed through one virtual network among a plurality of virtual networks established on a path, which is mainly different from the example described above. In this Modified example 1, on the basis of a specific configuration example of a path control system 4 v illustrated inFIG. 13 , a packet search rule table, a topology information table, and a UN specific information table illustrated inFIG. 14 stored by a C-plane device 1 v, and a settings data table illustrated inFIG. 15 stored by the C-plane device 1 v and aU-plane device 2 v, a setting order of a settings data table will be described using a sequence diagram illustrated inFIGS. 16 to 18 , and, on the basis of a set settings data table, a transmission order of each packet illustrated inFIG. 19 will be described using a sequence diagram illustrated inFIGS. 20 and 21 . In addition, “v” will be appropriately attached to a corresponding reference sign of the example described above as a reference sign of each of devices and functional blocks of this Modified example 1. The configuration and the functions of this Modified example 1 are almost the same as those of the example described above, and thus, similar parts will not be described as is appropriate, and differences will be mainly described. -
FIG. 13 is a diagram illustrating a specific configuration of a path control system 4 v of this Modified example 1. As illustrated inFIG. 14 , in this Modified example 1, compared to the example described above, one or more virtual communication paths are established between a UN 3 v and aU-plane device 2 v and betweenU-plane devices 2 v. More specifically, two virtual communication paths including a virtual communication path associated with avirtual network 1 and a virtual communication path associated with avirtual network 2 are established between a UN 3 v-1 and aU-plane device 2 v-1, between a UN 3 v-2 and aU-plane device 2 v-2, between aU-plane device 2 v-1 and aU-plane device 2 v-2, and between aU-plane device 2 v-2 and aU-plane device 2 v-3. In addition, one virtual communication path associated with thevirtual network 1 is established between a UN 3 v-3 and aU-plane device 2 v-3, and one virtual communication path associated with thevirtual network 2 is established between a UN 3 v-4 and aU-plane device 2 v-3. Packet communication from the UN 3 v that is a transmission source to the UN 3 v that is a transmission destination is performed through one of the virtual communication path associated with thevirtual network 1 and the virtual communication path associated with thevirtual network 2. A configuration illustrated inFIG. 13 is a configuration based on an example of the topology information table illustrated inFIG. 14(b) and an example of the UN specific information table illustrated inFIG. 14(c) . In addition, the virtual communication path is a communication connecting device and represents a communication path generated in association with a virtual network. -
FIG. 14 is a diagram illustrating examples of a packet search rule table, a topology information table, and a UN specific information table, which are stored using a storage unit 10 v, in Modified example 1. Hereinafter, differences from the table examples of the example described above illustrated inFIG. 4 will be described.FIG. 14(a) is a diagram illustrating an example of the packet search rule table. As illustrated inFIG. 14(a) , in the packet search rule table, part information and designation information are associated with each other for each virtual network. In other words, a network company can set a search condition for each virtual network.FIG. 14(b) is a diagram illustrating an example of a topology information table. As illustrated inFIG. 14(b) , a connection relation between devices is set for each virtual network.FIG. 14(c) is a diagram illustrating an example of a UN specific information table. As illustrated in the table example illustrated inFIG. 14(c) , for each UN 3 v, a UN 3 v identification code for each virtual network is (acquired by an acquisition unit 11 v and set by a setting unit 12 v) is set. -
FIG. 15 is a diagram illustrating an example of a settings data table set by the setting unit 12 v in Modified example 1. Hereinafter, differences from the table example of the example described above illustrated inFIG. 5 will be described. As illustrated inFIG. 15 , an identifier of aU-plane device 2 v, a packet search condition, and an identifier of a transmission destination device are associated with each other for each virtual network. - When a new UN 3 v is connected to a
U-plane device 2 v, the setting unit 12 v acquires node information relating to the UN 3 v, extracts search key information of the UN 3 v for each virtual network on the basis of the acquired node information and designation information of each virtual network stored using the storage unit 10 v, and sets a transmission destination of the packet of a case in which the extracted search key information of the virtual network is included in a packet part indicated by the part information of each virtual network stored using the storage unit 10 v of a packet received by theU-plane device 2 v at the time of relaying the packet for each virtual network and eachU-plane device 2 v. Hereinafter, description will be presented more specifically with reference toFIGS. 16 to 21 . -
FIGS. 16 to 18 are sequence diagrams illustrating an order in which a new UN 3 v is connected to aU-plane device 2 v, and a settings data table based on the connection is set in eachU-plane device 2 v. S70 inFIG. 16 corresponds to S20 of the example described above illustrated inFIG. 9 , and S72 to S74 inFIG. 16 respectively correspond to S21 to S23 illustrated inFIG. 9 , and thus detailed description thereof will not be presented here. In S71, virtual communication paths associated with thevirtual network 1 and thevirtual network 2 are established betweenU-plane devices 2 v on the basis of the example of the topology information table illustrated inFIG. 14(b) stored in S70. Each of S75 and S77 illustrated inFIG. 16 corresponds to S24 illustrated inFIG. 9 and represents that a settings data table is set in (transmitted to) aU-plane device 2 v represented by the identifier of a correspondingU-plane device 2 v for each identifier of the virtual network of the example of the settings data table illustrated inFIG. 15 . In addition, when a settings data table associated with thevirtual network 1 is received in S75, theU-plane device 2 v-2 that has received a connection request in S72 establishes a virtual communication path associated with thevirtual network 1 for communicating with the UN 3 v-2, which has performed the connection process in S72, in S76. Similarly, when a settings data table associated with thevirtual network 2 is received in S77, theU-plane device 2 v-2 that has received the connection request in S72 establishes a virtual communication path associated with thevirtual network 2 for communicating with the UN 3 v-2, which has performed the connection process in S72, in S78. - S79 to S85 of the sequence diagram illustrated in
FIG. 17 respectively correspond to S72 to S78 of the sequence diagram illustrated inFIG. 16 . The sequence diagram illustrated inFIG. 16 is a setting example of a settings data table based on a connection request from the UN 3 v-2, and the sequence diagram illustrated inFIG. 17 is a setting example of a settings data table based on a connection request from the UN 3 v-1. - S86 to S90 of the sequence diagram illustrated in
FIG. 18 respectively correspond to S72 to S76 of the sequence diagram illustrated inFIG. 16 . The sequence diagram illustrated inFIG. 16 is a setting example of a settings data table associated with thevirtual network 1 based on a connection request from the UN 3 v-2, and the sequence diagram illustrated inFIG. 18 is a setting example of a settings data table associated with thevirtual network 1 based on a connection request from the UN 3 v-3. Only being a settings data table associated with thevirtual network 1 is in accordance with only thevirtual network 1 being associated with the UN 3 v-3 as an identifier of the virtual network in the UN specific information table illustrated inFIG. 14(c) . In other words, this represents that only the UN 3 v identification code relating to thevirtual network 1 is extracted by the setting unit 12 v from the node information acquired by the acquisition unit 11 v. - S91 to S95 of the sequence diagram illustrated in
FIG. 18 respectively correspond to S72 to S74, S77, and S78 of the sequence diagram illustrated inFIG. 16 . The sequence diagram illustrated inFIG. 16 is a setting example of a settings data table associated with thevirtual network 2 based on a connection request from the UN 3 v-2, and the sequence diagram illustrated inFIG. 18 is a setting example of a settings data table associated with thevirtual network 2 based on a connection request from the UN 3 v-4. Only being a settings data table associated with thevirtual network 2 is in accordance with only thevirtual network 2 being associated with the UN 3 v-4 as an identifier of the virtual network in the UN specific information table illustrated inFIG. 14(c) . In other words, this represents that only the UN 3 v identification code relating to thevirtual network 2 is extracted by the setting unit 12 v from the node information acquired by the acquisition unit 11 v. -
FIG. 19 is a diagram illustrating an example of a packet transmitted from the UN 3 v that is a transmission source. As illustrated inFIG. 19 , a virtual communication path header designating a virtual communication path is present at the start of a packet, and subsequently, a user packet part is present. The virtual communication path header of a packet illustrated in each ofFIGS. 19(a) and 19(c) illustrates a virtual communication path associated with thevirtual network 1, and the virtual communication path header of a packet illustrated in each ofFIGS. 19(b) and 19(d) illustrates a virtual communication path associated with thevirtual network 2. In a user packet part of a packet illustrated in each ofFIGS. 19(a) and 19(c) relating to the virtual communication path associated with thevirtual network 1, a UN 3 v identification code of 64 bits is included in the first 64 bits, and the remaining part is a payload part. On the other hand, in a user packet part of a packet illustrated in each ofFIGS. 19(b) and 19(d) relating to the virtual communication path associated with thevirtual network 2, a UN 3 v identification code of 32 bits is included from the first 128-th bit, and subsequently, the other header parts and a payload part follow. - An example of a packet illustrated in
FIG. 19(a) illustrates a packet transmitted in the process (S100 to S104) of “a” of the sequence diagram illustrated inFIG. 20 to be described later. Similarly, an example of a packet illustrated inFIG. 19(b) illustrates a packet transmitted in the process (S105 to S109) of “b” of the sequence diagram illustrated inFIG. 20 , an example of a packet illustrated inFIG. 19(c) illustrates a packet transmitted in the process (S110 to S114) of “c” of the sequence diagram illustrated inFIG. 21 , and an example of a packet illustrated inFIG. 19(d) illustrates a packet transmitted in the process (S115 to S119) of “d” of the sequence diagram illustrated inFIG. 21 . - Each of
FIGS. 20 and 21 is a sequence diagram illustrating an order in which a packet is transmitted inU-plane devices 2 v in which a settings data table is set. First, the process of “a” illustrated inFIG. 20 will be described. First, the packet illustrated inFIG. 19(a) is transmitted from a UN 3 v-2 to aU-plane device 2 v-2, which is directly connected to the UN 3 v-2, through a virtual communication path associated with the virtual network 1 (Step S100). Next, thevirtual network 1 is determined as a virtual network to which the packet transmitted by theU-plane device 2 v-2 belongs, a settings data table corresponding to the determinedvirtual network 1 is referred to (in other words, records of thevirtual network 1 determined as the virtual network identifier are referred to), and it is determined that it is determined that a seventh record of the table example illustrated inFIG. 15 satisfies a search condition that the identifier of theU-plane device 2 v is “U-plane device 2 v-2” of its own device, and 64 bits from the start of the user packet part are “0x 0000 0000 0000 0001” like the packet illustrated inFIG. 19(a) as a packet search condition (Step S101). Next, a packet is transmitted to aU-plane device 2 v-1 represented by the identifier of the transmission destination device of the seventh record using theU-plane device 2 v-2 (Step S102). - Next, the
virtual network 1 is determined as a virtual network to which the packet transmitted by theU-plane device 2 v-1 belongs, a settings data table corresponding to the determinedvirtual network 1 is referred to (in other words, records of thevirtual network 1 determined as the virtual network identifier are referred to), and it is determined that a first record of the table example illustrated inFIG. 15 satisfies a search condition that the identifier of theU-plane device 2 v is “U-plane device 2 v-1” of its own device, and 64 bits from the start of the user packet part are “0x 0000 0000 0000 0001” like the packet illustrated inFIG. 19(a) as a packet search condition (Step S103). Next, a packet is transmitted to a UN 3 v-1 represented by the identifier of the transmission destination device of the first record using theU-plane device 2 v-1 (Step S104). - The process of “b” illustrated in
FIG. 20 and the processes of “c” and “d” illustrated inFIG. 21 are similar thereto, and description thereof will not be presented here. - Subsequently, Modified example 2 of the example of the
path control system 4 described above will be described. In this Modified example 2, a U-plane device 2 (rendezvous node) that is a default transmission destination of a case in which a packet search condition does not match is designated using an access point name (a so-called an access point name (APN)), which is the mainly difference from the example described above. The rendezvous node, for example, is a packet data network gateway (PDN-GW) in an EPS. - In this Modified example 2, a specific configuration example of a path control system 4 r is illustrated in
FIG. 22 , a packet search rule table, a topology information table, and a UN specific information table stored by a C-plane device 1 r are illustrated inFIG. 23 , a flowchart illustrating this Modified example 2 of the process of S3 of the sequence diagram illustrated inFIG. 6 (the process relating to the generation of a settings data table) in detail is illustrated inFIG. 24 , and settings data tables stored by the C-plane device 1 r and aU-plane device 2 r are illustrated inFIGS. 25 and 26 . In addition, “r” will be appropriately attached to a corresponding reference sign of the example described above as a reference sign of each of devices and functional blocks of this Modified example 2. The configuration and the functions of this Modified example 2 are almost the same as those of the example described above, and thus, similar parts will not be described as is appropriate, and differences will be mainly described. -
FIG. 22 is a diagram illustrating a specific configuration of a path control system 4 r of this Modified example 2. As illustrated inFIG. 22 , in this Modified example 2, compared to the example described above, aU-plane device 2 r-2 is designated as a rendezvous node. AUN 3 r-2 that is a default route representing a node to which a packet is transmitted in a case in which a search condition does not match is connected to theU-plane device 2 r-2. In addition, a newU-plane device 2 r-4 is connected to a C-plane device 1 r, aU-plane device 2 r-1, and aU-plane device 2 r-3. AU-plane device 2 r-4 is designated as a rendezvous node, and aUN 3 r-6 that is a default route is connected thereto. In addition, anew UN 3 r-5 is connected to theU-plane device 2 r-1. In addition, a configuration illustrated inFIG. 22 is a configuration based on an example of the topology information table illustrated inFIG. 23(b) and an example of the UN specific information table illustrated inFIG. 23(c) . -
FIG. 23 is a diagram illustrating examples of a packet search rule table, a topology information table, and a UN specific information table in Modified example 2 that are stored using a storage unit 10 r. Hereinafter, differences from the table examples in the example described above illustrated inFIG. 4 will be described.FIG. 23(a) is a diagram illustrating an example of the packet search rule table. As illustrated inFIG. 23(a) , in the packet search rule table, part information and designation information are associated with each other for each access point name and each designation information type. Here, the designation information type is a type of designation information at an access point represented by a corresponding access point name. Specific examples of the designation information type include a type of a network protocol and a PDN type in an EPS. In this way, by assigning a designation information type in accordance with an access point name, even in the case of connecting to a same access point, an appropriate type can be selected from among a plurality of types of designation information. A network company can set a search condition for each access point name and each designation information type.FIG. 23(c) is a diagram illustrating an example of the UN specific information table. As in the table example illustrated inFIG. 23(c) , in eachUN 3 r, aUN 3 r identification code for each access point name and each designation information type is (acquired by the acquisition unit 11 r) set (by the setting unit 12 r). -
FIG. 24 is a flowchart illustrating the process of S3 of the sequence diagram illustrated inFIG. 6 in this Modified example 2 in detail. First, after S2 illustrated inFIG. 6 , S10 to S12 illustrated inFIG. 7 are performed. After S12, by using the setting unit 12 r, it is determined whether or not an access point name (rendezvous node) is designated in the node information acquired in S2 illustrated inFIG. 6 (Step S210). In a case in which it is determined that an access point name is not designated in S210, the process of S13 and S14 illustrated inFIG. 7 is performed (in other words, the process proceeds with the access point name blanked), and the process proceeds to the process of S4 illustrated inFIG. 6 . On the other hand, in a case in which it is determined that an access point name is designated in S210, by using the setting unit 12 r, a transmission destination device forming a shortest path from the rendezvous node toward aUN 3 r to which the UN device identifier acquired in S2 is assigned is calculated (Step S213). Next, by using the setting unit 12 r, for eachU-plane device 2 r forming a shortest path calculated in S213, an entry including a device identifier of theU-plane device 2 r, the generated packet search condition, and a device identifier of the calculated transmission destination device forming the shortest path is generated and is added to the settings data table (Step S214). After S214, the process proceeds to S4 illustrated inFIG. 6 . - Each of
FIGS. 25 and 26 is a diagram illustrating an example of a settings data table set using the setting unit 12 r in this Modified example 2. Hereinafter, differences from the table example in the example illustrated inFIG. 5 described above will be described. As illustrated inFIGS. 25 and 26 , for each access point name and each designation information type, an identifier of theU-plane device 2 r, a packet search condition, and an identifier of the transmission destination device are associated with each other. - The example of the settings data table illustrated in
FIG. 25 is a table example of an initial state stored using the storage unit 10 r in S0 illustrated inFIG. 6 . As illustrated in the table example ofFIG. 25 , in the initial state,U-plane devices 2 r other than the rendezvous node are set to transmit a packet toward the rendezvous node in a case in which the search condition does not match. In addition, theU-plane device 2 r of the rendezvous node in which a default route is set is set to transmit a packet to the default route node in a case in which the search condition does not match. In addition, theU-plane device 2 r of the rendezvous node in which a default route is not set may discard the packet in a case in which the search condition does not match (alternatively, a device identifier representing “discard” may be set in the transmission destination device identifier). - Next, the operations and effects of the C-
plane device 1 and theU-plane device 2 configured as in this embodiment will be described. - The C-
plane device 1 according to this embodiment is a C-plane device 1 in apath control system 4 comprising one or moreU-plane devices 2 relaying packet communication betweenUNs 3 and the C-plane device 1 performing path control of the packet communication and comprises astorage unit 10 that stores designation information designating search key information of aUN 3 used as a search key of transmission destination determination when theU-plane device 2 relays a packet and part information indicating a packet part in which the search key information is included and anacquisition unit 11 and asetting unit 12 that, when anew UN 3 is connected to aU-plane device 2, acquire node information relating to theUN 3, extract the search key information of theUN 3 based on the acquired node information and the designation information stored using thestorage unit 10, and set a transmission destination of a packet for eachU-plane device 2 in a case in which extracted search key information is included in a packet part indicated by part information, which is stored using thestorage unit 10, of the packet received by theU-plane device 2 at the time of packet relaying. - By employing such a configuration, when a
new UN 3 is connected to aU-plane device 2, the transmission destination of a packet is set for eachU-plane device 2 in a case in which the search key information of theUN 3 based on designation information stored using thestorage unit 10 is included in a packet part indicated by the part information, which is stored using thestorage unit 10, of the packet that is received by theU-plane device 2 at the time of packet relaying. In other words, a transmission destination of a packet for eachU-plane device 2 can be set on the basis of the designation information and the part information stored using thestorage unit 10. In this way, for example, when designation information and part information designated by a network company are stored using thestorage unit 10, path control can be performed using the designation information and the part information designated by the network company. In other words, more flexible path control can be performed. - In addition, in the C-
plane device 1 according to this embodiment, the settingunit 12 may extract a plurality of pieces of search key information when the search key information is extracted and set a transmission destination for each of the extracted plurality of pieces of the search key information. By employing such a configuration, a plurality of pieces of search key information can be set for aUN 3, and thus, for example, more flexible path control such as setting a plurality of pieces of search key information in accordance with purposes and setting path control according to a purpose can be performed. - In addition, in the C-
plane device 1 according to this embodiment, the settingunit 12 may dynamically generate insufficiency information when search key information is extracted. By employing such a configuration, search key information can be extracted more reliably even in a case in which insufficiency information is present, and accordingly, a transmission destination of theU-plane device 2 can be set more reliably. - In addition, in the C-
plane device 1 according to this embodiment, thestorage unit 10 may further store topology information relating to a network topology of one or moreU-plane devices 2, and thesetting unit 12 may set a transmission destination on the basis of the topology information stored using thestorage unit 10. By employing such a configuration, for example, a transmission destination forming a shortest path toward atransmission destination UN 3 can be set on the basis of the topology information, and more efficient path control can be performed. - In addition, in the C-
plane device 1 v according to this embodiment, packet communication may be performed through one virtual network among a plurality of virtual networks established on a path, the storage unit 10 v may store designation information and part information for each virtual network, and the acquisition unit 11 v and the setting unit 12 v, when a new UN 3 v is connected to aU-plane device 2 v, may acquire node information relating to the UN 3 v, extract search key information of the UN 3 v for each virtual network, on the basis of the acquired node information and the designation information for each virtual network that is stored using the storage unit 10 v, and set a transmission destination of a packet for each virtual network and for eachU-plane device 2 v in a case in which the extracted search key information of the virtual network is included in a packet part indicated by part information of the packet received by theU-plane device 2 v at the time of relaying the packet, which is stored using the storage unit 10 v, for each virtual network. By employing such a configuration, in a packet communication network in which a plurality of virtual networks are established on a path, path control for each virtual network can be performed. In other words, more flexible path control can be performed. - In addition, in the
path control system 4 according to this embodiment, the settingunit 12 may generate a settings data table and transmit the generated settings data table to eachU-plane device 2, and theU-plane device 2 comprises: thestorage unit 20 that stores a settings data table transmitted by the settingunit 12; and thetransmission unit 22 that transmits a packet received at the time of relaying on the basis of the settings data table stored using thestorage unit 20. By employing such a configuration, in theU-plane device 2, the generated settings data table is stored, and a packet received at the time of relaying is transmitted on the basis of the stored settings data table. In other words, a packet is transmitted in theU-plane device 2 on the basis of the settings data table generated on the basis of the designation information and the part information stored using thestorage unit 10 of the C-plane device 1. In this way, for example, when designation information and part information designated by a network company are stored using thestorage unit 20, path control can be performed using the designation information and the part information designated by the network company. In other words, more flexible path control can be performed. - Here, as a problem of a conventional technology, there is a problem in that an EPS that is a standard of a mobile communication network cannot perform path control using an ID designated by a network company and a value of a packet field designated by the network company. According to the
path control system 4 of this embodiment, a packet search rule table including a set of an ID designated by a network company and a packet field designated by the network company is maintained by the C-plane device 1 that is a device responsible for controlling the network, and a settings data table relating to path control generated by combining the packet search rule table and UN user specific information is transmitted to theU-plane device 2 that is a device responsible for packet transmission and packet processing of the network. In this way, path control (ID routing) using an ID (search key information or designation information) designated by a network company and a packet field (part information) designated by the network company can be realized. For example, path control inside a mobile network can be realized using an arbitrary network protocol other than an Internet protocol (IP). In addition, the configuration of thepath control system 4 according to this embodiment can be applied to software defined networking (SDN), network function virtualization (NFV), a transport, a link, a node, a mobile core, a base station, and the like. - Here, “information” described in this specification may be represented using any one of other various technologies. For example, data, a direction, a command, information, a signal, a bit, a symbol, a chip, and the like acquired as described over the description presented above may be represented using a voltage, a current, an electromagnetic wave, a magnetic field or a magnetic particle, a photo field or a photon, or an arbitrary combination thereof.
- A term “determining” used in this specification includes various operations of various kinds. “Judging” or “deciding” for example, may include calculating, computing, processing, deriving, investigating, looking up (for example, a search in a table, a database, or another data structure), ascertaining, and the like. In addition, “determining” may include receiving (for example, reception of information), accessing (for example, an access to data included in a memory), or the like. Furthermore, “determining” may include resolving, selecting, choosing, establishing, comparing, and the like.
- A term “connected” or any modification thereof means a direct or indirect connection or combination of any kind between two or more elements and may include presence of one or more intermediate elements between two elements that are “connected” to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a physical and logical combination thereof. In the case of being used in this specification, two elements may be considered as being “connected” to each other by using one or more wires, cables, and/or a print electric connection and by using electromagnetic energy such as electromagnetic energy having a wavelength of a radio frequency region, a micro wave region, and a light (both visible light and invisible light) region as one non-limiting and non-inclusive example.
- Description of “on the basis of” used in this specification does not mean “on the basis of only” unless otherwise described clearly. In other words, description of “on the basis of” means both “on the basis of only” and “on the basis of at least.”
- As long as “including” and a modification thereof are used in this specification or the claims, these terms are intended to be inclusive similar to a term “being equipped with.” In addition, a term “or” used in this specification or the claims is intended not to be exclusive OR.
- In the processing order of each aspect/embodiment, a sequence diagram, a flowchart, and the like described in this specification, the order may be changed as long as there is no contradiction. For example, for a method described in this specification, elements of various steps are presented in an exemplary order, the order is not limited to the presented specific order.
- Aspects/embodiments described in this specification may be used independently, be combined to be used, or be used to be switched over in accordance with the execution. In addition, a notification (for example, a notification of “being X”) of predetermined information is not limited to be performed explicitly and may be performed implicitly (for example, a notification of predetermined information is not performed).
- As above, while the present invention has been described in detail, it is apparent to a person skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention may be modified or changed without departing from the concept and the scope of the present invention set in accordance with the claims. Thus, the description presented in this specification is for the purpose of exemplary description and does not have any limited meaning for the present invention.
-
-
- 1 C-plane device
- 2 U-plane device
- 3 UN
- 4 Path control system
- 10 Storage unit
- 11 Acquisition unit
- 12 Setting unit
- 20 Storage unit
- 21 Connection processing unit
- 22 Transmission unit
Claims (6)
1. A control node, which is a control plane (C-plane) device, in a path control system comprising the control node performing path control of packet communication between nodes and one or more relay nodes that are connected to the control node and relay the packet communication, the control node comprising:
a memory storing (i) designation information designating search key information of a node used as a search key determining a transmission destination that is a relay destination when one of the one or more relay nodes receives a packet, (ii) part information indicating a packet part in which the search key information is included and (iii) topology information relating to network topology of the one or more relay nodes,
wherein the control node,
in a case in which a new node is connected to at least one of the one or more relay nodes,
acquires node information relating to the new node,
extracts search key information of the new node on the basis of the acquired node information and the designation information stored in the memory, and,
in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information of the new node is included in a packet part indicated by the part information,
sets a transmission destination of the packet, on the basis of the topology information stored in the memory, for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission.
2. The control node according to claim 1 , wherein a plurality of pieces of search key information are extracted when the search key information is extracted, and a transmission destination is set for each of the plurality of pieces of extracted search key information.
3. The control node according to claim 1 , wherein insufficiency information is dynamically generated when the search key information is extracted.
4. The control node according to claim 1 ,
wherein the packet communication is performed through one virtual network among a plurality of virtual networks established on a path,
wherein the memory stores designation information, part information and topology information for each of the virtual networks, and
wherein the control node,
in a case in which the new node is connected to at least one of the one or more relay nodes,
acquires node information relating to the new node,
extracts search key information for each virtual network of the new node on the basis of the acquired node information and the designation information for each virtual network stored in the memory, and,
in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information for the virtual network of the new node is included in a packet part indicated by the part information for each virtual network,
sets a transmission destination of the packet, on the basis of the topology information for each virtual network stored in the memory, for each virtual network and for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission.
5. A path control system comprising:
a control node, which is a control plane (C-plane) device, performing path control of packet communication between nodes; and
one or more relay nodes that are connected to the control node and relay the packet communication,
wherein the control node comprises a first memory storing (i) designation information designating search key information of a node used as a search key determining a transmission destination that is a relay destination when one of the one or more relay nodes receives a packet, (ii) part information indicating a packet part in which the search key information is included and (iii) topology information relating to network topology of the one or more relay nodes and, in a case in which a new node is connected to at least one of the one or more relay nodes,
acquires node information relating to the new node,
extracts search key information of the new node on the basis of the acquired node information and the designation information stored in the first memory, and,
in a case in which, in a packet received by at least one relay node among the one or more relay nodes, the search key information of the new node is included in a packet part indicated by the part information,
generates a settings data table in which a transmission destination of the packet is set, on the basis of the topology information stored in the memory, for at least a part of the one or more relay nodes or for each of all the relay nodes in a transmission path of the packet transmission and transmits the generated settings data table to a determined relay node, from among the at least a part of the one or more relay nodes or for each of all the relay nodes in a transmission path of the packet transmission, and
wherein the determined relay node comprises a second memory storing the settings data table transmitted by the control node and transmits a packet received at the time of relaying on the basis of the settings data table stored in the second memory.
6. The control node according to claim 2 , wherein insufficiency information is dynamically generated when the search key information is extracted.
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US8625457B2 (en) * | 2007-12-03 | 2014-01-07 | International Business Machines Corporation | Method and apparatus for concurrent topology discovery |
US8300555B2 (en) | 2008-01-30 | 2012-10-30 | Qualcomm Incorporated | Management of wireless relay nodes using identifiers |
WO2011030889A1 (en) * | 2009-09-14 | 2011-03-17 | 日本電気株式会社 | Communication system, forwarding node, path management server, communication method, and program |
JP5716741B2 (en) * | 2010-06-09 | 2015-05-13 | 日本電気株式会社 | COMMUNICATION SYSTEM, LOGICAL CHANNEL CONTROL DEVICE, CONTROL DEVICE, COMMUNICATION METHOD, AND PROGRAM |
KR101887581B1 (en) * | 2011-12-26 | 2018-08-14 | 한국전자통신연구원 | Flow-based packet transport device and packet management method thereof |
WO2013179542A1 (en) * | 2012-05-31 | 2013-12-05 | 日本電気株式会社 | Network system, routing control device, routing control method, and nontemporary computer-readable medium for storing program |
JP6114994B2 (en) | 2013-05-30 | 2017-04-19 | Kddi株式会社 | Communication system, MME, PGW, SGW and program |
JP6012080B2 (en) * | 2013-08-09 | 2016-10-25 | 日本電信電話株式会社 | Communication system and handover method thereof |
WO2015025845A1 (en) * | 2013-08-20 | 2015-02-26 | 日本電気株式会社 | Communication system, switch, controller, ancillary data management device, data transfer method, and program |
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