JP5011576B2 - Network system, communication control device, communication control method, and program - Google Patents

Description

  The present invention relates to a network communication control technique, and more particularly to a communication control technique in PLC (Power Line Communication).

  FIG. 1 is a diagram of a network system in a technique (for example, Patent Document 1) related to the present invention.

  In the network system using the PLC modem as shown in FIG. 1, there is a difference in communication speed capability between the router 1 and the PLC modem 2, and "the communication speed between the router 1 and the PLC modem (A) 2A". > When the communication speed between the PLC modem (A) 2A and the PLC modem (B) 2B is reached, a packet loss occurs in the packet transmitted from the router 1 in the PLC modem (A) 2A. . This is because the amount of packets input to the PLC modem (A) 2A is larger than the amount of output packets, so that packets accumulate in the PLC modem (A) 2A and overflow.

  When packet loss occurs in the PLC modem, packet loss is recovered due to retransmission by protocol processing in the upper layer or a retransmission request from the terminal, but this makes the communication state unstable and reduces the communication speed. End up.

  In addition, when using the QoS (Quality of Service) function installed in the router, if a packet loss occurs in the PLC modem A (2a) -PLC modem C (2c), the QoS function of the router 1 Packet loss occurs regardless of For this reason, there is a problem that the QoS function of the router 1 cannot be used effectively.

  In addition, since PLC modem communication differs between PLC modems, there is a problem that packet loss occurs in communication between specific PLC modems when the transmission speed from the router is kept constant regardless of the destination. It was.

  In the PLC modem system, even if the communication speed between the PLC modems is low, if the link is established with Ethernet (registered trademark) at 100 Mbps, communication is performed with the PLC modem at a maximum of 100 Mbps. In this case, in communication between PLC modems, the communication band is exceeded, so that packet loss occurs in the PLC modem.

  When a packet loss occurs in the PLC modem, the router cannot recognize that the packet loss has occurred, so the packet loss is retransmitted by a retransmission request from the terminal or a retransmission by a higher layer protocol. I was dealing with it.

However, in the countermeasure method by retransmission, communication becomes unstable and the communication speed is deteriorated.
JP 2007-74377 A

  The problem to be solved by the present invention is to reduce the packet loss in the PLC modem by reducing the transmission speed from the router 1 for each destination MAC address according to the communication speed (communication band) between the PLC modems. It is to realize stable use and effective use of the QoS function.

The present invention for solving the above problem is a network system, which acquires a communication speed between a transmission source node and a transmission destination node from a transmission result of test data transmitted / received between nodes, and A PLC (Power Line Communication) modem that generates a first table in which the MAC address, the MAC address of the transmission destination node, and the acquired communication speed are associated with each other, and a table in which the MAC address of the own device is the transmission source MAC address The second table is extracted from the generated first table, the IFG (Inter Frame Gap) size of the packet is calculated from the communication speed of the extracted table, and is associated with the destination MAC address of the extracted table. And the transmission path is generated using the generated second table . Considering the communication speed, it has a router that transmits a packet to a destination node.
The present invention for solving the above-described problems is a communication control device, which generates a MAC address of a transmission source node from a transmission result of test data transmitted and received between nodes generated by a PLC (Power Line Communication) modem. The first table in which the MAC address of the destination node is associated with the communication speed between the source node and the destination node is received, and the table in which the MAC address of the own device is the source MAC address is generated. The first table is extracted, the IFG (Inter Frame Gap) size of the packet is calculated from the communication speed of the extracted table, and the second table is generated in association with the destination MAC address of the extracted table. , Using the generated second table to consider the transmission speed of the transmission path A means characterized by comprising means for transmitting a packet to the node.
In order to solve the above problems, the present invention provides a communication control method in which a MAC address of a transmission source node and a MAC address of a transmission destination node are determined based on a transmission result of test data transmitted / received between nodes by a PLC (Power Line Communication) modem. Generating a first table that associates the communication speed between the transmission source node and the transmission destination node, and the router generates the table in which the MAC address of the own device is the transmission source MAC address. A step of extracting from the first table; a step of calculating an IFG (Inter Frame Gap) size of a packet from the communication speed of the extracted table by the router; and a step of calculating the IFG size of the extracted table by the router. Second table associated with the destination MAC address And a step of transmitting data to a destination node in consideration of a communication speed of a transmission path using the generated second table by the router.
The present invention for solving the above-described problem is a program for a communication control apparatus, wherein the program is based on a transmission result of test data generated by a PLC (Power Line Communication) modem and transmitted / received between nodes. A process of receiving a first table in which a MAC address of a node, a MAC address of a transmission destination node, and a communication speed between the transmission source node and the transmission destination node are associated, and the MAC address of the communication control device is transmitted A process of extracting a table that is an original MAC address from the generated first table, a process of calculating an IFG (Inter Frame Gap) size of a packet from the communication speed of the extracted table, and the calculated IFG size Corresponding to the destination MAC address of the extracted table The communication control device is configured to execute processing for generating a table of 2 and processing for transmitting a packet to a destination node in consideration of a communication speed of a transmission path using the generated second table. And

  According to the present invention, since the packet is not transmitted from the router at a communication speed higher than that of the PLC modem, packet loss in the PLC modem can be suppressed.

  The present invention is characterized in that in a Power Line Communication (PLC) system, communication control is performed in accordance with the communication speed of the PLC modem.

  In order to explain the features of the present invention, it will be specifically described below with reference to the drawings.

  A first embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram of a network system as an embodiment of the present invention.

  As shown in FIG. 1, this system includes a router 1, a PLC modem (A) 2A, a PLC modem (B) 2B, a PLC modem (C) 2C, a personal computer 3, and a VOIP adapter 4. The PLC modems are connected by a power line. In the following description, the Power Line between the PLC modem (A) 2A and the PLC modem (B) 2B is referred to as Power Line 21, and the Power Line between the PLC modem (A) 2A and the PLC modem (C) 2C. Is referred to as Power Line22. In the following description, the MAC address of the router 1 is “aa: aa: aa: aa: aa: aa”, the MAC address of the personal computer 3 is “bb: bb: bb: bb: bb: bb”, and the VoIP adapter The description will be made assuming that the MAC address is “cc: cc: cc: cc: cc: cc”.

  Each PLC modem 2 extracts three parameters of a source MAC address, a destination MAC address, and a communication speed from communication between PLC modems during packet transmission, and associates the extracted parameters with each other in FIG. Table A (communication speed table) as shown is created. Further, the PLC modem (A) 2A transmits / receives a special packet to / from the router 1 and notifies the router 1 of information on Table A. The special packet realizes communication of communication control information between the PLC modem 2 and the router 1 by embedding a special code in the Ether Type in the Ether Header and performing communication.

  The router 1 is connected to the PLC modem (A) 2A via the Ethernet 21, and can send and receive special packets with the PLC modem (A) 2A. The other port of the router 1 is connected to the WAN. As illustrated in FIG. 3, the router 1 includes a table generation unit 11, a communication control unit 12, a transmission unit 13, a reception unit 14, and a router function unit 15.

  The table generation unit 11 uses a table from each PLC modem 2 to generate a table (communication control table) for adjusting an Ethernet packet IFG (Inter Frame Gap) as shown in Table B of FIG. Create and hold. Specifically, a destination MAC address and a PLC modem communication speed associated with a table in which the MAC address of the own device is included in the source MAC address are extracted from the received table, and the IFG is calculated from the PLC modem communication speed. The size is calculated and generated in association with the extracted transmission destination MAC address.

  The communication control unit 12 has a general QoS function, and controls the communication speed of the PLC modem (A) 2A by controlling the IFG with reference to Table B.

  The transmission unit 13 transmits the data packet, and the reception unit 14 receives the data packet.

  The router function unit 15 has a general router function. Since a well-known technique of the router function is used in the present invention, its detailed configuration is omitted.

  The personal computer 3 is a general information processing apparatus and is connected to the PLC modem (B) 2B via the Ethernet 24. Since a well-known function of the information processing apparatus is used in the present invention, its detailed configuration is omitted.

  The VoIP adapter 4 is connected to the PLC modem (C) 2C via the Ethernet 25. The VoIP adapter 4 is a device well known to those skilled in the art, and since a well-known function of the VoIP adapter is used in the present invention, its detailed configuration is omitted.

  Next, the operation of the router 1 and the PLC modem (A) 2A will be described using the flowchart shown in FIG.

  When the router 1 is activated (step 41), the router function unit 15 confirms the communication link of the LAN port of the router 1 (step 42).

  When the link of the LAN port is established, the router function unit 15 next transmits a special packet to the PLC modem (A) 2A to confirm the link of the PLC modem (A) 2A (step 43).

  When receiving the special packet indicating the establishment of the PLC link from the PLC modem (A) 2A, the router function unit 15 transmits a test packet to the personal computer 3 and the VoIP adapter 4 (step 44).

  The PLC modem (A) 2A determines the communication speed between the router 1 and the terminal 3 from the communication result of the test packet transmitted / received between the router 1 and the terminal 3 and between the router 1 and the VoIP adapter 4. The communication speed between the router 1 and the VoIP adapter 4 is calculated (step 45), and Table A is created by associating the transmission source MAC address, the transmission destination MAC address, and the PLC modem communication speed (step 46).

  When the PLC modem (A) 2A creates Table A, it transmits information on Table A to the router 1 using a special packet (step 47).

  When the table generation unit 11 receives the information on Table A via the reception unit 14, the table generation unit 11 creates and holds information on Table B from the information on Table A (step 48).

  When the router 1 transmits a packet, the communication control unit 12 reads the IFG size by referring to TableB using the destination MAC address, thereby changing the IFG size for each destination MAC address and transmitting the packet. (Step 49).

  Here, an IFG insertion image will be described with reference to FIGS. A case in which packets are continuously transmitted from the router 1 to the personal computer 3 and from the router 1 to the VoIP adapter 4 will be described.

  After transmitting the packet to the personal computer 3, the router 1 corresponds to the IFG “ab (bittime)” associated with “bb: bb: bb: bb: bb: bb” which is the MAC address of the personal computer 3 of Table B. After an interval, a packet to the VoIP adapter 4 is transmitted.

  Similarly, after packet transmission to the VoIP adapter 4, the IFG “ac (bittime)” associated with “cc: cc: cc: cc: cc: cc” which is the MAC address of the VoIP adapter 4 of Table B Send with an interval of.

  Thereby, the router 1 can control the transmission speed from its own device to each terminal (the personal computer 3 and the VoIP adapter 4).

  As described above, according to the present invention, by controlling the communication speed of the data packet from the router 1 to the PLC modem (A) 2A, it is possible to suppress packet loss between the PLC modems and to stabilize the communication. In addition, the QoS function of the router 1 can be effectively utilized.

  As another embodiment of the present invention, the basic configuration is as described above. By inserting a router having this function between the PLC modem (B) 2B and the personal computer 3, a terminal (personal computer) Also for transmission from 3), it is possible to suppress packet loss in the PLC modem (B) 2B. The system configuration in this case is shown in FIG.

  In FIG. 6, the router 1B controls the transmission speed to the PLC modem (B) 1B using the function of the router 1 described above. As a result, the packet loss on the PLC modem can also be reduced for communication from the personal computer 3, enabling stable communication and effective use of the QoS function.

  Moreover, the same effect can be acquired by giving the function which the router 1 mentioned above has to the VoIP adapter 4. FIG.

  As described above, according to the present embodiment, by performing speed control for transmission from the terminal, it is possible to maintain the stability of communication not only for transmission from the router but also for transmission from the terminal. .

  The router of the present invention described above can be configured by hardware, as is apparent from the above description, but can also be realized by a computer program. In this case, functions and operations similar to those of the above-described embodiment are realized by a processor that operates according to a program stored in the program memory. Note that some of the functions of the above-described embodiments can be realized by a computer program.

  As described above, the present invention has the following effects.

  According to the present invention, since the packet is not transmitted from the router at a speed higher than the communication speed of the PLC modem, the packet loss in the PLC modem can be suppressed.

  In addition, since packet loss of the PLC modem is suppressed, packet retransmission can be reduced.

  Further, by generating a packet loss generated in the PLC modem in the router by narrowing the transmission band in the router, the QoS of the router can be effectively used. As a result, in order to suppress packet loss in the PLC modem, when packet loss is likely to occur in the PLC modem using Ethernet flow control, it is not necessary to make a request to stop communication to the router. Eliminates the possibility of stopping high-level packets.

  Also, since packet retransmission between PLC modems can be reduced, communication can be stabilized.

It is a figure which shows an example of the network system of this invention. It is a figure which shows an example of the Table produced | generated by the Table produced | generated by a PLC modem, and a router. It is a block diagram of a router of the present invention. It is a flowchart of the operation | movement which determines the router transmission speed in this invention. It is an image figure for knowing insertion of IFG at the time of controlling the speed of data transmission. It is another example of composition of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Router 2 PLC modem 3 Personal computer 4 VoIP adapter 11 Table property western part 12 Communication control part 13 Transmission part 14 Reception part 15 Router function part

Claims (4)

The communication speed between the transmission source node and the transmission destination node is acquired from the transmission result of the test data transmitted / received between the nodes, and the MAC address of the transmission source node, the MAC address of the transmission destination node, and the acquired communication speed are obtained. PLC (Power) that generates the associated first table
Line Communication) modem,
A table in which the MAC address of its own device is the source MAC address is extracted from the generated first table, and the IFG (Inter Frame Gap) size of the packet is calculated from the communication speed of the extracted table and extracted. in association with the destination MAC address in the table to generate a second table, in consideration of the communication speed of the transmission path by using a second table wherein the generating, the router sends a packet to the destination node <br A network system comprising: From the transmission result of the test data transmitted / received between the nodes generated by the PLC (Power Line Communication) modem, the MAC address of the transmission source node, the MAC address of the transmission destination node, and between the transmission source node and the transmission destination node The first table in which the communication speed is associated is received, the table whose MAC address of the own device is the source MAC address is extracted from the generated first table, and the packet is determined from the communication speed of the extracted table. An IFG (Inter Frame Gap) size is calculated, a second table is generated in association with the destination MAC address of the extracted table, and the communication speed of the transmission path is considered using the generated second table And having means for transmitting the packet to the destination node Communication control device. From the transmission result of the test data transmitted / received between nodes by a PLC (Power Line Communication) modem, the MAC address of the transmission source node, the MAC address of the transmission destination node, and the communication speed between the transmission source node and the transmission destination node Generating a first table in which
A router extracting from the generated first table a table in which the MAC address of the device is a source MAC address;
The router calculates an IFG (Inter Frame Gap) size of the packet from the communication speed of the extracted table;
The router associates the calculated IFG size with the destination MAC address of the extracted table to generate a second table;
The router transmits data to the destination node in consideration of the communication speed of the transmission path using the generated second table ;
Communication control method characterized in that it comprises a. A communication control apparatus program, wherein the program is:
From the transmission result of the test data transmitted / received between the nodes generated by the PLC (Power Line Communication) modem, the MAC address of the transmission source node, the MAC address of the transmission destination node, and between the transmission source node and the transmission destination node A process of receiving a first table in which a communication speed is associated;
A process of extracting a table in which the MAC address of the communication control device is a source MAC address from the generated first table;
A process of calculating an IFG (Inter Frame Gap) size of the packet from the communication speed of the extracted table;
A process of generating a second table by associating the calculated IFG size with a transmission destination MAC address of the extracted table;
A program for causing the communication control device to execute a process of transmitting a packet to a transmission destination node in consideration of a communication speed of a transmission path using the generated second table .

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