JP2012049772A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform routing considering a connection state in each network by reflecting routing information acquired based on a wired and wireless protocols with each other.SOLUTION: A communication device of the present invention designating at least one of a plurality of nodes constructing a communication network operating according to a wired protocol and a wireless protocol performing routing according to wired route information and wireless route information respectively, and transmitting data to another node based on the wired route information and wireless route information: comprises wired route information storage means for storing the wired route information used for data transmission according to the wired protocol; wireless route information storage means for storing the wireless route information used for data transmission according to the wireless protocol; and control means for controlling to cause the wired route information storage means and the wireless route information storage means to store the route information generated based on either of wired or wireless routing protocol.

Description

  The present invention relates to a communication device.

  For example, Non-Patent Document 1 discloses a specification of OLSR (Optimized Link State Routing Protocol) which is one of ad hoc network routing protocols.

T. Clausen et al., “Optimized Link State Routing Protocol”, October 2003, The Internet Society, [searched May 31, 2010], Internet URL http://www.ietf.org/rfc/rfc3626.txt

  The present invention has been made from the background as described above, and reflects the wired route information and the wireless route information acquired based on the control message of the wired protocol and the wireless protocol in each other's protocol, and connects in each network. Provided is an improved communication device that performs routing in consideration of a situation.

To achieve the above object, a communication device (2) according to the present invention configures a communication network (1) that operates according to a wired protocol that performs routing according to wired route information and a wireless protocol that performs routing according to wireless route information. A communication device that transmits data to the other nodes based on the wired route information and the wireless route information to the other nodes in the communication network. The wired route information storage means (214) for storing the wired route information used when transmitting data to other nodes according to the wired protocol, and the data to other nodes according to the wireless protocol A wireless path information storage unit for storing the wireless path information used when transmitting (214) and control means for controlling the route information generated based on the routing protocol of either the wired protocol or the wireless protocol to be stored in the wired route information storage means and the wireless route information storage means ( 3).
In addition, the code | symbol attached | subjected here intends helping an understanding of this invention, and does not intend limiting the technical scope of this invention.

  According to the communication device according to the present invention, the routing information obtained based on the control message of the wired protocol and the wireless protocol is reflected in the mutual protocol, and the routing considering the connection status in each network is performed. It can be carried out.

It is a figure which illustrates the structure of a general communication apparatus. It is a figure which illustrates the structure of the network which has a communication apparatus which concerns on this invention. FIG. 3 is a diagram illustrating a software configuration of the communication apparatus illustrated in FIG. 2. It is a figure which illustrates the format of a route update notification message. 4 is a flowchart illustrating an integrated management process of an integrated management unit illustrated in FIG. 3. (A) is a figure which illustrates the network comprised from the some node containing the communication apparatus which concerns on this invention, (B) is the radio | wireless shown in FIG. 3 which comprises the communication apparatus shown to (A). It is a figure which illustrates the list | wrist of the routing information base which the routing information base of a protocol memorize | stores, (C) memorize | stores the routing information base of the wired protocol shown in FIG. 3 which comprises the communication apparatus shown to (A). It is a figure which illustrates the list of route information base.

[Background of the invention]
In order to help understanding of the present invention, first, the background that led to the present invention will be described.
In a computer network composed of a plurality of nodes (movable or fixed communication devices, terminals, etc.), necessary data is transmitted and received between nodes by performing routing using a wired protocol or a wireless protocol.
As the wired routing protocol, for example, IGP (Interior Gateway Protocol) including RIP (Routing Information Protocol), OSPF (Open Shortest Path Fast) and the like are used.
Further, as a wireless routing protocol, for example, a unicast ad hoc routing protocol such as OLSR (Optimized Link State Routing) or AODV (Adhoc Ondemand Distance Vector) is used.

FIG. 1 is a diagram illustrating a configuration of a general communication apparatus that performs routing using a wired protocol and a wireless protocol and can communicate with other nodes.
As shown in FIG. 1, a general communication apparatus includes an Ethernet (registered trademark) PHY 200, a Wireless Network PHY 202, a Layer 2 layer (L2 layer; MAC layer) Ethernet MAC 204, a Wireless MAC 206, a layer 1 layer (L1 layer; physical layer). It is composed of a routing table 208 of three layers (L3 layer; network layer), and a wired protocol unit and a wireless protocol unit of layers higher than the layer 4 layer (L4 layer; transport layer).
Further, each of the wired protocol unit and the wireless protocol unit includes a control message transmission / reception unit 210, a protocol control unit 212, a routing information base 214, a control message generation unit 216, and a routing registration unit 218.

In the following, in each figure, substantially the same components and processes are denoted by the same reference numerals.
For example, when distinguishing the “control message transmission / reception unit 210” of the wired protocol unit and the “control message transmission / reception unit 210” of the wireless protocol unit, the “wired control message transmission / reception unit 210” and the “wireless control message transmission / reception unit” 210 ".

The Ethernet PHY 200 controls establishment, maintenance, and release of a physical connection of a wired network in response to a request from the Ethernet MAC 204.
The Wireless Network PHY 202 controls establishment, maintenance, and release of a wireless network physical connection in response to a request from the Wireless MAC 206.
The Ethernet MAC 204 makes a control request to the Ethernet PHY 200 based on the control message transmitted from the wired control message transmission / reception unit 210.
The Ethernet MAC 204 periodically transmits a control message to the wired control message transmission / reception unit 210.

The control message transmitted by the Ethernet MAC 204 indicates, for example, a RIP (Routing Information Protocol) route update message.
The wireless MAC 206 makes a control request to the wireless network PHY 202 based on the control message transmitted from the wireless control message transmission / reception unit 210.
The wireless MAC 206 periodically transmits a control message to the radio control message transmission / reception unit 210.

The control message transmitted by the wireless MAC 206 indicates, for example, an OLSR Hello message, a TC (Topology Control) message, an HNA (Host and Network Association) message, and the like.
The Hello message is used to grasp the information of nodes existing around its own node, the TC message is used to grasp the connection state of the nodes of the entire network, and the HNA message is used by the node as a gateway. Used for monkeys.
The routing table 208 stores route information input from the wired routing registration unit 218 and the wireless routing registration unit 218.

The route information includes, for example, data transmission source node information, data transmission destination node information, information on adjacent relay nodes among relay nodes that relay data to transmit data from the transmission source node to the transmission destination node, and relay nodes. Number and output destination connection type (wired or wireless).
The control message transmitting / receiving unit 210 receives a control message periodically transmitted from the Ethernet MAC 204 in the wired protocol unit, and receives a control message periodically transmitted from the Wireless MAC 206 in the wireless protocol unit.
Further, the control message transmission / reception unit 210 outputs the received control message to the protocol control unit 212.

In addition, the control message transmission / reception unit 210 outputs the control message input from the control message generation unit 216 to the Ethernet MAC 204 in the wired protocol unit, and outputs to the Wireless MAC 206 in the wireless protocol unit.
The protocol control unit 212 analyzes the control message based on the control message input from the control message transmission / reception unit 210, generates a route information base that is basic information of the route information stored in the routing table 208, and generates routing information. Output to the base 214.
The route information base is, for example, control message reception time, information type, own node information storing the route information base, source node information of the control message, data destination node information, relay node information, source node The number of hops up to and the connection type of the output destination are included.
The information type is, for example, LinkTupleSet indicating that it is a path information base between its own node and an adjacent wireless node, 2hopLinkTupleSet indicating that it is a path information base with a wireless node two hops ahead of its own node, MPRTuple indicating that it is a path information base between a node and a relay node, and HNATuple indicating that it is a path information base between its own node and a wired node.

The routing information base 214 stores the route information base input from the protocol control unit 212 so that it can be referred to the control message generation unit 216 and the routing registration unit 218.
Further, the routing information base 214 deletes the route information base when the route information base from the transmission source node included in the stored route information base is not input from the protocol control unit 212 for a predetermined period.
The wired route information base stored in the wired routing information base 214 is used for grasping the route for transmitting data to the transmission destination node according to the wired protocol.
The wireless route information base stored in the wireless routing information base 214 is used for grasping a route for transmitting data to the destination node according to the wireless protocol.

The control message generation unit 216 periodically acquires a route information base stored in the routing information base 214, extracts necessary information from the acquired route information base, and generates a control message.
In addition, the control message generation unit 216 outputs the generated control message to the control message transmission / reception unit 210.
The routing registration unit 218 periodically monitors the routing information base 214. When the route information base stored in the routing information base 214 is updated, the routing registration unit 218 generates route information based on the updated route information base, and generates a routing table. Output to 208.

As described with reference to FIG. 1, a general communication device can use a wired protocol and a wireless protocol. However, since each of them is used independently, the route information acquired based on the control message of each protocol is used. References to each other are not reflected in each other's route information base.
For this reason, it may be difficult to realize routing that takes into account the connection status of nodes in the wired network and the connection status of nodes in the wired network.
Specifically, for example, nodes that are wirelessly connected can know each other's existence, but one node may not know the existence of a node that is wired-connected to the other node.

In this case, the node may not be able to obtain routing information to other nodes that should originally transmit data, and may not be able to transmit data appropriately to other nodes.
The wireless device according to the present invention is made from such a background, and the wired route information and the wireless route information based on the control message of the wired protocol and the wireless protocol are reflected in each other protocol, and the connection in each network is made. It is devised to perform routing considering the situation.

[Network 1]
FIG. 2 is a diagram illustrating a configuration of the network 1 including the communication devices 2-1 to 2-5 according to the present invention.
As shown in FIG. 2, the network 1 includes general wired routers (RT) 120-1 and 120-2, general wireless router (WR) 122-1, and general terminal devices ( TMN (Terminal) 124-1 to 124-3 and communication devices (IR; Integrated Router) 2-1 to 2-5 according to the present invention.
The communication devices 2-1 to 2-5, the wired routers 120-1 and 120-2, and the terminal devices 124-1 to 124-3 can be connected to each other via a wired link 130.
Further, the communication devices 2-1 to 2-5 can be connected to the other communication devices 2-1 to 2-5 and the wireless router 122-1, via the wireless link 140.

The network 1 includes domains 150-1 to 150-3, and the communication apparatuses 2-1 to 2-5 are other communication apparatuses 2-1 belonging to different domains connected via the wireless link 140. Data is transmitted to and received from 2-5 and the wireless router 122-1.
In FIG. 2, for clarification and concrete explanation, the network 1 includes two wired routers 120-1 and 120-2, one wireless router 122-1, and three terminal devices 124. -1 to 124-3 and five communication devices 2-1 to 2-5 are taken as specific examples, but the number of these routers and devices is not limited to this. .

Further, for example, the communication device 2-1 and the wired router 120-1 are connected via the wired link 130, and the communication device 2-1 and the wireless router 122-2 are connected via the wireless link 140. However, the connection state is not limited to that shown in FIG.
Hereinafter, when any one of a plurality of components such as the communication devices 2-1 to 2-5 is indicated, the communication device 2 may be simply referred to as a wired router 120, a wireless router 122, and a terminal device 124. And the communication device 2 may be simply described as “node” without being distinguished.

[Hardware configuration]
Hereinafter, the hardware configuration of the communication apparatus 2 will be described.
As shown in FIG. 2, the communication device 2 includes a CPU 102, a memory 104 including a ROM and a RAM, and a main body 100 including these peripheral circuits, an input / output device 106 including a display device, a keyboard, and the like, a wireless link 140. A wireless interface (IF) unit 110 that transmits / receives information between the computer 100 and the main body 100, a wired IF unit 112 that transmits / receives information between the wired link 130 and the main body 100, and a storage medium 116 such as HD, CD, DVD And a recording device 114 for writing and reading data.
In other words, the communication device 2 has a component for realizing the required function, and has a component as a wireless communication device that can communicate with other nodes.

Software configuration
FIG. 3 is a diagram illustrating a communication device program (software configuration) 20 executed on the communication device 2 (FIG. 2).
As illustrated in FIG. 3, the communication device program 20 has a configuration in which a notification message transmission / reception unit 222 and an integrated management unit 3 are added to the configuration of the general communication device illustrated in FIG. 1.
The integrated management unit 3 includes a notification message reception unit 224, an integrated routing information base 226, a control unit 228, and a notification message transmission unit 230.
The communication device program 20 is stored in, for example, the memory 104 (FIG. 2), supplied to each communication device 2, and communicated with each other on an OS (not shown) installed in each communication device 2 as necessary. The hardware resources of the device 2 are specifically used for execution.

The communication device program 20 acquires and integrates information based on a message using a wired protocol and information based on a message using a wireless protocol, and shares information between both protocols.
The protocol control unit 212 generates a route update notification message when the route information base stored in the routing information base 214 is updated in addition to the operation in the general communication device (FIG. 1), and sends the notification message transmission / reception unit. The data is output to 222.
Also, the protocol control unit 212 updates the route information base stored in the routing information base 214 based on the route update notification message input from the notification message transmission / reception unit 222.

FIG. 4 is a diagram illustrating a format of a route update notification message.
As shown in FIG. 4, the format of the route update notification message includes a Protocol Number field indicating a protocol type (OLSR, RIP, etc.), an Msg Type field indicating a message type (Hello message, TC message, HNA message, etc.), It includes an Originator Address field that indicates the address of a node that transmits a route update notification message, an Add Routing Number field that indicates the number of routes added by updating, a Del Routing Number field that indicates the number of routes deleted by updating, and the like.
The notification message transmission / reception unit 222 (FIG. 3) receives the route update notification message input from the protocol control unit 212 and outputs it to the notification message reception unit 224.
In addition, the notification message transmission / reception unit 222 outputs the route update notification message input from the notification message transmission unit 230 to the protocol control unit 212.

The notification message reception unit 224 outputs the route update notification message input from the notification message transmission / reception unit 222 of the wired protocol unit and the wireless protocol unit to the integrated routing information base 226.
The integrated routing information base 226 stores the route update notification message input from the notification message receiving unit 224 so that it can be referred to the control unit 228.
The control unit 228 determines the output destination protocol based on the route update notification message stored in the integrated routing information base 226, specifies the output destination protocol to the notification message transmission unit 230, and notifies the route update notification. A message is output (described later with reference to FIG. 5).

When the wired protocol is specified as the output destination protocol from the control unit 228, the notification message transmission unit 230 outputs the route update notification message input from the control unit 228 to the wired notification message transmission / reception unit 222.
Further, when the wireless protocol is designated as the output destination protocol from the control unit 228, the notification message transmission unit 230 outputs the route update notification message input from the control unit 228 to the wireless notification message transmission / reception unit 222. .

[Process of integrated management unit 3]
FIG. 5 is a flowchart illustrating an integrated management process of the notification message receiving unit 224 and the control unit 228 constituting the integrated management unit 3 shown in FIG.
In the processing of S300 to S310 described below, the route update notification message transmitted from one of the protocol units of the wired protocol unit and the wireless protocol unit (FIG. 3) is transmitted to the other protocol unit. It is executed to update the routing information base 214 of the protocol part.

In step 300 (S300; FIG. 5), the notification message reception unit 224 receives the route update notification message from the notification message transmission / reception unit 222.
In step 302 (S302), the notification message receiving unit 224 registers the route update notification message received in S300 in the integrated routing information base 226.
In step 304 (S304), the control unit 228 determines whether or not the route update notification message registered in the integrated routing information base 226 in S302 is transmitted from the wired protocol unit.

Specifically, for example, the control unit 228 determines whether or not the protocol type stored in the Protocol Number field (FIG. 4) of the route update notification message is a wired protocol.
If the route update notification message is transmitted from the wired protocol unit, the control unit 228 proceeds to the process of S306, and otherwise proceeds to the process of S308.
In step 306 (S306), the control unit 228 designates a wireless protocol unit as an output destination to the notification message transmission unit 230, and outputs a route update notification message registered in the integrated routing information base 226 in S302. To end the process.

In step 308 (S308), the control unit 228 determines whether or not the route update notification message transmitted from the wireless protocol unit is generated based on the HNA message of the wireless protocol.
Specifically, for example, the control unit 228 determines whether or not the message type stored in the Msg Type field (FIG. 4) of the route update notification message is an HNA message.
If it is an HNA message, the control unit 228 proceeds to the process of S310, and otherwise ends the process.
In step 310 (S310), the control unit 228 designates a wired protocol unit as an output destination to the notification message transmission unit 230, and outputs a route update notification message registered in the integrated routing information base 226 in S302. To end the process.

[Operation example of communication device 2]
FIG. 6A is a diagram exemplifying a network composed of a plurality of nodes including an IR # 1 node and an IR # 2 node showing two communication apparatuses 2 (FIGS. 2 and 3) according to the present invention. is there.
FIG. 6B is a diagram illustrating a list of route information bases stored in the wireless routing information base 214 (FIG. 3) of the IR # 1 node.
FIG. 6C is a diagram illustrating a list of route information bases stored in the wired routing information base 214 of the IR # 1 node.
Hereinafter, an example of an update operation based on the route information of the communication device 2 will be described with reference to FIGS. 6 (A) to 6 (C).

In addition, hereinafter, for the sake of clarification and realization, a specific example is a case where the IR # 1 node shown in FIG. 6A updates the route information base in the network shown in FIG. explain.
In FIG. 6A, the IP address shown in the wired link and the wireless link between the nodes indicates the domain address, and the IP address shown in FIG. 6A is set in each node. It shall be.
Further, it is assumed that the IP address of each domain to which the adjacent node belongs is set in the IR node.
For example, as illustrated in FIG. 6A, the IP address “192.168.0.1” of the domain “192.168.0. *” To which the adjacent wired node RT # 2 belongs to the IR # 1 node. It is assumed that the IP address “192.168.1.1” of the domain “192.168.1. *” To which the adjacent wireless node WR belongs is set.

As shown in FIG. 6B, the No. stored in the wireless routing information base 214 (FIG. 3) is stored. 1 to 3 indicate, in order, a path information base between the WR node adjacent to the IR # 1 node, the IR # 2 node two hops ahead, and the WR of the relay node.
For example, no. 1 is based on the IP address “192.168.1.1” of its own node (IR # 1), the IP address “192.168.1.2” of the WR node, and the netmask “255.255. 255.255 ”and the number of hops“ 1 ”to the WR node.
Further, the No. stored in the wireless routing information base 214 (FIG. 3) is stored. 4 and 5 indicate, in order, the path information base between the IR # 1 node, the adjacent RT # 2 node, and the RT # 1 node two hops away.

For example, no. 4 is based on the IP address “192.168.1.1” of its own node (IR # 1), the IP address “192.168.1.1” of the relay node (IR # 1), and the transmission destination. The domain information “192.168.0.0” to which the node belongs, the netmask “255.255.255.0”, and the hop count “1” are indicated.
That is, no. 6 shows a path information base to the RT # 2 node adjacent to the IR # 1 node.
As shown in FIG. 6C, the No. stored in the wired routing information base 214 (FIG. 3) is stored. 1 and 2 are No. 1 shown in FIG. This corresponds to the route information base of the wired nodes RT # 2 and RT # 1 of 4,5.

In the following (1) to (7), the No. stored in the wireless routing information base 214 (FIG. 3) is stored. No. 6 and subsequent route information bases, and No. 6 stored in the wired routing information base 214. An example of the update operation based on the route information base 3 and later will be described.
(1) The IR # 1 node receives the wireless protocol HNA message transmitted from the IR # 2 node via the WR node.
As described above, the HNA message is a message used when the node functions as a gateway.
(2) The IR # 1 node analyzes the HNA message received in (1) and sets the generated route information base to No.1. 6 as a route information base (FIG. 6B).
As shown in FIG. 6 is a route information base in which the relay node is the IR # 2 node, the destination node domain is “192.168.2.0”, and the hop count is “3”, that is, the route information base to the RT # 4 node. Show.

(3) The IR # 1 node generates a route update notification message based on the route information base generated in (2), and transmits the route update notification message from its own wireless protocol unit to its own integrated management unit 3 (FIG. 3). .
(4) The IR # 1 node receives and registers the route notification message transmitted in (3) at its own integrated management unit 3 (S300; FIG. 5) (S302).
(5) The IR # 1 node determines that the route notification message received in (4) has been generated based on the HNA message of the wireless protocol (S304, S308), and transmits it to its own wired protocol unit (S310). .

(6) The IR # 1 node receives the route notification message transmitted in (5) by its own wired protocol unit.
(7) The IR # 1 node generates a route information base based on the route notification message received in (6). 3 as a route information base (FIG. 6C).
As a result, the IR # 1 node becomes No. 1 in FIG. It can be understood that there is a wired node capable of transmitting data on a route having a destination node domain of “192.168.2.0” and a hop count of “3” as shown in FIG.
By repeating the same processing as the above (1) to (7), the route information base of the wireless protocol part stored in the IR # 1 node is further updated (Nos. 7 to 9 in FIG. 6B).
These updates are reflected in the route information base of the wired protocol part stored in the IR # 1 node (Nos. 4 to 6 in FIG. 6C).

The communication device 2 performs routing according to the path information base constructed as described above.
That is, when an IP packet is input from the network, the communication device 2 confirms the route information base and determines whether or not the packet is to be relayed from the source and destination of the IP packet.
When the communication device 2 determines that the packet is to be relayed, the communication device 2 outputs the packet to the designated network interface. When the communication device 2 determines that the packet is not to be relayed, the communication device 2 discards the packet.

[Features of communication device 2]
Hereinafter, features of the communication device 2 (FIGS. 2 and 3) according to the present invention will be described.
As described above, the wireless device 2 according to the present invention shares the route information acquired by the wired protocol and the control message of the wireless protocol between both protocols.
By sharing route information between the wired and wireless protocols, for example, the communication device 2 can grasp the presence of a node wired to the other communication device 2 and is wired to the communication device 2. Data can be transmitted and received between the node and the node connected to the other wireless device 2 by wire.
Therefore, according to the wireless device 2 according to the present invention, it is possible to realize routing in consideration of the connection status in each of the wired network and the wireless network.
Further, as described above, only the route constructed by the HNA message is notified to the wired protocol.
This is because the route constructed by the Hello message or the TC message is not necessary on the wired side, and thus the capacity of the route information base can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Network, 2 ... Communication apparatus, 100 ... Main body, 102 ... CPU, 104 ... Memory, 106 ... Input / output device, 110 ... Wireless IF part, 112 ... Wired IF unit 114... Recording device 116 116 storage medium 120 general wire router 122 general wireless router 124 general terminal device 130 ... Wired link, 140 ... Wireless link, 150 ... Domain, 200 ... Ethernet PHY, 202 ... Wireless Network PHY, 204 ... Ethernet MAC, 206 ... Wireless MAC, 208 ... Routing table, 210... Control message transmission / reception unit, 212... Protocol control unit, 214. , 216... Control message generation unit, 218... Routing registration unit, 222... Notification message transmission / reception unit, 3 .. integrated management unit, 224. Routing information base, 228... Control unit, 230... Notification message transmission unit

Claims (1)

1 shows at least one of a plurality of nodes constituting a communication network that operates according to a wired protocol that performs routing according to wired route information and a wireless protocol that performs routing according to wireless route information, up to other nodes in the communication network. A communication device that transmits data to the other node based on the wired route information and the wireless route information,
Wired route information storage means for storing the wired route information used when transmitting data to other nodes according to the wired protocol;
Radio path information storage means for storing the radio path information used when transmitting data to other nodes according to the radio protocol;
And a control unit configured to control the route information generated based on any one of the wired protocol and the wireless protocol to be stored in the wired route information storage unit and the wireless route information storage unit.

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