WO2014208707A1 - ネットワークシステムおよびその制御方法 - Google Patents
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- WO2014208707A1 WO2014208707A1 PCT/JP2014/067082 JP2014067082W WO2014208707A1 WO 2014208707 A1 WO2014208707 A1 WO 2014208707A1 JP 2014067082 W JP2014067082 W JP 2014067082W WO 2014208707 A1 WO2014208707 A1 WO 2014208707A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- the new and old information is managed by a number called a sequence number (Sequence Number) that each node device has, and is incremented each time a route search or answer process is executed for itself, and another node device executes the route search process. Is recorded along with route information. Thereafter, other node devices can detect whether the information is new or old by comparing the sequence number in the newly arrived packet with the already recorded sequence number, and determine whether or not the update is possible.
- sequence Number Sequence Number
- the route search packet first reaches the corresponding node device through the lower ring. Since the route reply occurs, the transfer is aborted, and the node device on the lower ring side to the corresponding node device establishes a route with the transmission source through the lower ring side. At this time, the route search packet wraps around the right side of the destination node device only through the upper ring, and a reverse route is formed.
- a node device for example, the node device 8
- the route search packet first reaches the corresponding node device through the lower ring. Since the route reply occurs, the transfer is aborted, and the node device on the lower ring side to the corresponding node device establishes a route with the transmission source through the lower ring side. At this time, the route search packet wraps around the right side of the destination node device only through the upper ring, and a reverse route is formed.
- an object of the present invention is to provide a network system capable of selecting an appropriate route and a control method thereof.
- the present invention provides a network system in which a plurality of node devices whose installation positions are fixed are communicably connected by a link, and the source node device is a route to the destination node device.
- a route search signal is transmitted, a node device arranged between the source node device and the destination node device receives the route search signal.
- the node device when a node device having information on a route to the destination node device transmits the route response signal, the node device transmits information indicating that the route response signal has been transmitted. Is added to the route search signal and transferred, and the node device that has received the route search signal to which information indicating that the route answer signal has been transmitted is not transmitted or added. It is characterized in that it is transmitted only when a new route answer signal is required with reference to the information. According to such a configuration, it is possible to prevent the route answer signal from being transmitted repeatedly.
- the plurality of node devices are communicably connected via a wired link. According to such a configuration, it is possible to select an appropriate route even when the link is wired.
- a route reply signal that is a signal is transmitted to the source node device, and the node device that has received the route reply signal refers to the route reply signal, and The node device that establishes a route to the destination, transfers the route answer signal to the next node device, and transmits the route answer signal, to the node devices around the node device that sent the route answer signal.
- the node devices around the node device that transmitted the route search signal and transmitted the route answer signal establish the route to the transmission source with reference to the route search signal. According to such a method, it is possible to select an appropriate route.
- FIG. 1 is a diagram illustrating an example of a configuration of a network system according to the first embodiment of the present invention.
- the network system according to the present embodiment includes node devices 10-1 to 10-10 and links 20-1 to 20-10, and the node devices 10-1 to 10-10 Connected by links 20-1 to 20-10 so as to form a loop.
- the node devices 10-1 to 10-10 are fixed stations whose installation positions are fixed, and the links 20-1 to 20-10 are configured by wired connection.
- FIG. 2 shows a detailed configuration example of the node device. Since the node devices 10-1 to 10-10 have the same configuration, they will be described as the node device 10 below.
- the node device 10 includes a packet relay processing unit 11, a control unit 12, a storage unit 13, receiving units 14-1 to 14-n, and transmitting units 15-1 to 15-n. ing.
- a route search packet (corresponding to the “route search signal” in the claims) having the latest sequence number of 10-8 and the sequence number of the node device 10-1 itself is generated. Note that the sequence number of the destination node device 10-8 is retrieved from the path information 13a and given the latest sequence number. If the sequence number of the node device 10-8 does not exist in the route information 13a, for example, “0” is given as the sequence number, and a flag indicating that the route is unknown is added.
- the node device 10-1 broadcasts such a route search packet. For example, in the example shown in FIG. 1, as indicated by a solid arrow in FIG. 3, the node device 10-1 transmits a route search packet to the node devices 10-2 and 10-10.
- the route search analysis processing is executed, and the transfer source (the node device 10-1 in the node devices 10-2 and 10-10) is executed. ) To itself and the cost value included in the route search packet is updated.
- each of the node devices 10-2 and 10-10 has a sequence number relating to the transmission source (node device 10-1) stored in the route search packet and a sequence relating to the transmission source (node device 10-1) that the node device 10-2 and 10-10 has.
- the sequence number included in the route search packet is larger (newer), or the sequence number is the same and the cost value is less than the previous value. If the node device 10-1 is unknown to 2 and 10-10 and the sequence number does not exist, a route to the node device 10-1 that is the transmission source is created. On the other hand, when the sequence number stored in the route search packet is smaller (older), the route search packet is discarded.
- the transmission source IP address, the current cost value, and the sequence number of the transmission source node device 10-1 are recorded. Since the source indicated by the source IP address is on the side of the route search packet transfer source node device (node device 10-1 in this example), the route to be transmitted to the transfer source node device when communication is required In addition to recording, the path information 13a is searched with reference to the destination IP address. When the destination is itself or when new information is described in the route information 13a, a route reply packet (corresponding to the “route reply signal” in the claims) is sent to the node device 10-1. Send. In addition, as described above, it is possible to determine whether the route information is new or old by comparing sequence numbers in the packets. That is, when the sequence number is large, it can be determined as new information.
- the route search packet when not transmitting a route reply packet like the past, while transferring a route search packet to a surrounding node device (a plurality of node devices adjacent to itself), Unlike the conventional case, even when a route reply packet is transmitted, the route search packet is further transferred to surrounding node devices.
- the route search packet since the node devices 10-2 and 10-10 have not transmitted the route reply packet, the route search packet is transferred to the node devices 10-3 and 10-9.
- the same processing is executed in the node devices 10-3 and 10-9, and neither the node device 10-3 nor 10-9 is a destination node, and since the route is not known, the cost value is incremented.
- the route search packet is transferred to the node devices 10-4 and 10-8.
- the node device 10-7 receives the route search packet transferred from the node device 10-6.
- the cost value of the route passing through the already recorded node device 10-8 is 4, the cost value of this route search packet is 6, and this cost value is larger, so the node device 10-7 discards the route search packet via the node device 10-6.
- the packet is transferred through the lower ring as a route.
- the node device 10-7 receives the route search packet from the node device 10-8 before the node device 10-6 has been described. However, depending on the congestion state of the communication route, It may be received from the node device 10-6 before the node device 10-8.
- the node device 10-7 registers the route passing through the node device 10-8 as the route for the transmission source.
- the node device 10-6 has the same cost value for the upper and lower rings, so the route is created based on the route search packet that has arrived first. For example, when a route search packet from the upper ring arrives first, the upper ring is registered as a transmission source route. After that, when a route search packet arrives from the lower ring, since this route search packet has been processed, it is compared with the cost value of the recorded route, and the cost value is the same. Is destroyed.
- the node device 10-8 that has transmitted the route reply packet transfers the route search packet to the node device 10-7
- the node device 10-7 is connected to the node device 10-1.
- the lower ring can be selected as the path between.
- step S10 the control unit 12 determines whether or not a route search packet has been received. If it is determined that the packet has been received (step S10: Yes), the control unit 12 proceeds to step S11, and otherwise (step S10: No). ) Repeat the same process.
- step S11 the control unit 12 executes a route search analysis process that is a process of analyzing information included in the received route search packet.
- step S12 the control unit 12 compares the sequence number related to the transmission source stored in the route search packet with the sequence number related to the transmission source that the control unit 12 has, and the sequence number included in the route search packet is If it is larger (newer), the process proceeds to step S14, and if these are the same, the process proceeds to step S13. If the sequence number stored in the route search packet is smaller (older), the process returns to step S10 and described above. Repeat the same process as in.
- step S13 the control unit 12 compares the cost value of the route search packet newly received in step S10 with the cost value of the route that it has, and the cost value of the route search packet newly received in step S10 is determined. If it is less than the cost value of its own route, the process proceeds to step S14. If it is equal to or higher than the cost value of its own route, the process returns to step S10 and the same processing as described above is repeated.
- step S16 the control unit 12 determines whether or not there is an item corresponding to the route information 13a stored in the storage unit 13, and if it is determined that there is a corresponding item (step S16: Yes). The process proceeds to step S17, and otherwise (step S16: No), the process proceeds to step S20.
- step S18 the control unit 12 generates a route reply packet including information indicating an appropriate route to itself.
- step S19 the control unit 12 transmits a route answer packet to the transfer source of the route search packet.
- step S20 the control unit 12 transfers the route search packet to the next node device.
- step S21 it is determined whether or not the process is to be ended. If it is determined that the process is not to be ended (step S21: No), the process returns to step 10 and the same process as described above is repeated. In step S21: Yes, the process ends.
- the node device transfers the route search packet to the next node device, so that an appropriate route can be selected.
- the node device 10-1 is a transmission source and the node device 10-5 is a transmission destination will be described.
- the cost from the node device 10-1 to the node device 10-5 is 7, and the midway through the node device 10-6. Therefore, the cost from the node device 10-1 to the node device 10-5 is 6, so that an appropriate route is a route via the node device 10-6.
- the route search packet transmitted from the node device 10-1 first reaches the node device 10-5 through the upper ring side with a short number of relays, and then reaches the node device 10- 4 is established as the shortest route to the node device 10-1. After that, the route search packet wraps around the route passing through the node device 10-6, and it is determined that the sequence number related to the transmission source is the same in step S12 of the flowchart shown in FIG. 4, and is smaller than the past information in step S13.
- step S14 a route is created, and the route to the node device 10-1 is switched to a route that passes through the node device 10-6.
- a node device in the middle of knowing a route to a transmission destination node device can transmit a route reply packet on behalf of the transmission destination node device.
- the intermediate node device when a route reply is made by an intermediate node device, the intermediate node device adds reply information indicating that the intermediate node device has made an answer when forwarding a route search packet. . By adding this information, it is possible to recognize that the destination node device or other node device to which the route search packet arrives has already been answered, and prevent duplicate responses.
- FIG. 6 is a diagram for explaining the operation of the third embodiment.
- FIG. 6 shows an example in which the node device 10-1 searches for a route to the node device 10-8, and the node device 10-9 knows the route to the node device 10-8.
- a reply is made to the node device 10-1 on the way, and a route search packet with halfway reply information is transferred to the subsequent node devices 10-8, 10-7, and 10-6.
- the node devices after the node device 10-8 can recognize that the reply is received by the node device 10-9 when receiving the packet with reply information on the way, and therefore know the route to the node device 10-8.
- the route answer is not implemented.
- the route reply packet includes the IP address of the node device that made the reply, the cost of the reply route, part or all of the sequence number used for the reply, and the received node device compares it with the information it has It is configured to be able to judge the necessity of answer by judging the new and old and the superiority or inferiority of the cost. Note that the node devices after the node device 10-8 transmit the route answer information when it is determined that new route answer information is necessary even when the packet with answer information in the middle is received. It may be.
- step S18 a route reply packet is generated, in step S33 route reply information indicating that a route reply has been made to the route search packet is added, and in step S19, the route reply packet is transmitted.
- step S30 determines whether route answer information has been added. If it is determined in step S30 that route answer information has been added, the process proceeds to step S31, where the sequence number of the path answer information is confirmed. If this sequence number is new, the process proceeds to step S18 and the path answer is entered. A route search packet to which information is added is transferred, and a route reply packet is transmitted. If the sequence number is the same as the answered information, the process proceeds to step S32. If the sequence number is older than the answered information, the process proceeds to step S20 to transfer a route search packet to which route answer information is not added.
- step S32 the cost of the route answer information is referred to.
- the process proceeds to step S18. Advances to step S20.
- the node device in the middle of the transmission destination can make a route reply and notify other node devices that the route reply has been made. Can be prevented.
- the network system is formed by the ten node devices 10-1 to 10-10.
- the network system may be nine or less or may be eleven or more. .
- the links 20-1 to 20-10 have been described by way of example of a wired connection, but may be configured by a wireless connection in some cases.
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Abstract
Description
このような構成によれば、適切な経路を選択することが可能となる。
このような構成によれば、コストが最も低い経路を選択することで最適な経路を確立することができる。
このような構成によれば、ホップ数が1以外のリンクが含まれる場合であっても、適切な経路を確立することができる。
このような構成によれば、経路回答信号が重複して送信されることを防止できる。
このような構成によれば、リンクが有線の場合であっても、適切な経路を選択することが可能となる。
このような方法によれば、適切な経路を選択することが可能となる。
図1は、本発明の第1実施形態に係るネットワークシステムの構成の一例を示す図である。図1に示すように、本実施形態に係るネットワークシステムは、ノード装置10-1~10-10およびリンク20-1~20-10を有しており、ノード装置10-1~10-10がループを形成するようにリンク20-1~20-10によって接続されて構成される。なお、ノード装置10-1~10-10は設置位置が固定された固定局であり、また、リンク20-1~20-10は、有線接続によって構成される。
つぎに、本発明の第1実施形態の動作について説明する。以下では、ノード装置10-1からノード装置10-8までの経路を探索する場合(ノード装置10-1が送信元で、ノード装置10-8が送信先である場合)を例に挙げて説明する。なお、この例では、リンク20-1~20-10のコストは全て1(=ホップ数)であるとする。その場合、ノード装置10-1は、自身のIP(Internet Protocol)アドレスを送信元IPアドレスとし、ノード装置10-8のIPアドレスを送信先IPアドレスとし、ノード装置10-1が記憶するノード装置10-8の最新のシーケンス番号と、ノード装置10-1自身のシーケンス番号を有する経路探索パケット(請求項中の「経路探索信号」に対応)を生成する。なお、送信先ノード装置10-8のシーケンス番号は、経路情報13aから検索し、最新のシーケンス番号を付与する。また、経路情報13aにノード装置10-8のシーケンス番号が存在しない場合には、シーケンス番号は、例えば、“0”と、未知の経路であることを示すフラグを付与する。ノード装置10-1は、このような経路探索パケットを、ブロードキャストする。例えば、図1に示す例では、図3に実線の矢印で示すように、ノード装置10-1は、ノード装置10-2,10-10に対して経路探索パケットを送信する。
つぎに、本発明の第2実施形態について説明する。第2実施形態では図5に示すように、コスト値がホップ数と異なっている。具体的には、図5の例では、リンク2-3のコスト値が4になっている。このような系であっても、図3の系と同様に図4のフローチャートにより対応することができる。
AODVにおいては送信先ノード装置への経路を知っている途中のノード装置が送信先ノード装置に代わって経路回答パケットを送信することが可能である。本発明の第3実施形態では、途中のノード装置による経路回答を実施する場合、途中のノード装置は、経路探索パケットを転送する際、途中のノード装置が回答したことを示す回答情報を付加する。本情報を付加することで後に、経路探索パケットが到着する送信先のノード装置や他のノード装置は既に回答済みであることを認識し、重複して回答することを防止できる。
以上の実施形態は一例であって、本発明が上述したような場合のみに限定されるものでないことはいうまでもない。例えば、以上の各実施形態では、10台のノード装置10-1~10-10によってネットワークシステムが形成されるようにしたが、9台以下であったり、11台以上であったりしてもよい。
11 パケット中継処理部
12 制御部
13 記憶部
13a ルーティングテーブル
14-1~14-n 受信部
15-1~15-n 送信部
21~29,30 リンク
Claims (6)
- 設置位置が固定された複数のノード装置がリンクによって通信可能に接続されたネットワークシステムにおいて、
送信元のノード装置は、送信先のノード装置までの経路を探索するための信号である経路探索信号を送信し、
前記送信元のノード装置と前記送信先のノード装置の間に配置されるノード装置は、前記経路探索信号を受信した場合には周辺のノード装置に転送し、
前記送信先のノード装置または前記送信先のノード装置までの経路に関する情報を有するノード装置は、前記経路探索信号を受信した場合には、前記送信元から前記送信先までの経路を回答する信号である経路回答信号を前記送信元のノード装置に向けて送信し、
前記経路回答信号を受信したノード装置は、前記経路回答信号を参照して前記送信先までの経路を確立するとともに、前記経路回答信号を次のノード装置に転送し、
前記経路回答信号を送信した前記ノード装置は、前記経路回答信号を送信したノード装置周辺のノード装置に前記経路探索信号を転送し、前記経路回答信号を送信したノード装置周辺のノード装置は、当該経路探索信号を参照して、前記送信元までの経路を確立する、
ことを特徴とするネットワークシステム。 - 前記ノード装置は、複数の経路探索信号を受信した場合には、最もコストが低い経路を選択して、前記送信元までの経路を確立することを特徴とする請求項1に記載のネットワークシステム。
- 前記ノード装置は、前記コストとして各リンクのホップ数を参照し、
前記各リンクは2以上のホップ数を含む、
ことを特徴とする請求項2に記載のネットワークシステム。 - 前記送信先のノード装置までの経路に関する情報を有するノード装置が前記経路回答信号を送信した場合、当該ノード装置は、前記経路回答信号を送信したことを示す情報を前記経路探索信号に付加して転送し、
前記経路回答信号を送信したことを示す情報が付加された前記経路探索信号を受信したノード装置は、前記経路回答信号を送信しないか、または、付加情報を参照して新たな経路回答信号が必要な場合のみ送信する、
ことを特徴とする請求項1乃至3のいずれか1項に記載のネットワークシステム。 - 前記複数のノード装置は、有線のリンクによって通信可能に接続されていることを特徴とする請求項1乃至4のいずれか1項に記載のネットワークシステム。
- 設置位置が固定された複数のノード装置がリンクによって通信可能に接続されたネットワークシステムの制御方法において、
送信元のノード装置が送信先のノード装置までの経路を探索するための信号である経路探索信号を送信し、
前記送信元のノード装置と前記送信先のノード装置の間に配置されるノード装置は、前記経路探索信号を受信した場合には周辺のノード装置に転送し、
前記送信先のノード装置または前記送信先のノード装置までの経路に関する情報を有するノード装置は、前記経路探索信号を受信した場合には、前記送信元から前記送信先までの経路を回答する信号である経路回答信号を前記送信元のノード装置に向けて送信し、
前記経路回答信号を受信したノード装置は、前記経路回答信号を参照して前記送信先までの経路を確立するとともに、前記経路回答信号を次のノード装置に転送し、
前記経路回答信号を送信した前記ノード装置は、前記経路回答信号を送信したノード装置周辺のノード装置に前記経路探索信号を転送し、前記経路回答信号を送信したノード装置周辺のノード装置は、当該経路探索信号を参照して、前記送信元までの経路を確立する、
ことを特徴とするネットワークシステムの制御方法。
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| JP2019180076A (ja) * | 2018-03-30 | 2019-10-17 | 古河電気工業株式会社 | ネットワークシステム、ネットワークシステムの経路切換方法、および、通信装置 |
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| JP4605426B2 (ja) * | 2003-08-08 | 2011-01-05 | ソニー株式会社 | 通信端末装置及びその制御方法、プログラム |
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|---|---|---|---|---|
| JP2003348107A (ja) * | 2002-05-29 | 2003-12-05 | Nec Corp | 双方向リング形ネットワーク及びそれに用いる経路選択方法並びにそのプログラム |
| JP2009038461A (ja) * | 2007-07-31 | 2009-02-19 | Mitsubishi Electric Corp | リング型光伝送システム |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019180076A (ja) * | 2018-03-30 | 2019-10-17 | 古河電気工業株式会社 | ネットワークシステム、ネットワークシステムの経路切換方法、および、通信装置 |
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| Publication number | Publication date |
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| JP6362594B2 (ja) | 2018-07-25 |
| BR112015032397A2 (pt) | 2017-07-25 |
| JPWO2014208707A1 (ja) | 2017-02-23 |
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