JP2005130368A - Communication network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication network system capable of reducing processing loads of a control station and a terminal and efficient utilization of a network. <P>SOLUTION: The communication network is constituted so that the control station 101 distributes data to a first terminal 102 when a data distributing destination is determined to be the first terminal 102 by an address management part 203, when the data distributing destination is determined to be the first, third terminals 102, 104, acquires an address of the first terminal 102 to which the data are already distributed by the address management part 203, creates a notification packet for changing to the address by packet management 201, transmits the notification packet to the network by a transmission and reception control part 202 and the third terminal 104 on the receiving side receives the notification packet by a transmission and reception control part 302, discriminates that the notification packet is address change notification by a packet management part 301, changes an address of the own station by an address management part 303 and starts reception of the packet transmitted to the changed address. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication network system, and more particularly to multicast communication.

  Conventionally, in the one-to-one communication represented by TCP / IP (Transmission Control Protocol / Internet Protocol), when the same data is distributed to a plurality of communication partners, it is necessary to repeat the same communication procedure by the number of communication partners. The load on the control station that distributes data and the network traffic increase in proportion to the number of terminals. In addition, broadcast communication that distributes data to all terminals in the network is received up to non-target terminals, and it is necessary to determine whether to discard or accept with higher-level protocols inside the terminals.

  In contrast, multicast communication is distributed only to terminals belonging to a specific group. As a typical mechanism, the IP address is used to perform the join / unjoin procedure for the multicast group to the multicast management server. The specification is RFC-2236 “Internet Group Management Protocol ver.2”. Etc.

In the conventional method, there is a method of generating a multicast address from the address of the transmission destination, and determining on the receiving side whether to discard or accept from the received multicast address and the address of the own station (for example, see Patent Document 1). In addition, a method for realizing multicast distribution by notifying each terminal serving as a distribution destination before transmitting a series of data packets is known (for example, see Patent Document 2).
Japanese Patent No. 3392599 JP 2002-368551 A

  However, the above conventional techniques have the following problems. In the method disclosed in Japanese Patent No. 3392599, it is not necessary to join / leave the group. However, since the address is calculated every time transmission is performed from the address of the terminal belonging to the transmission group, There is a problem that it is necessary to always check whether or not the destination station is included in the destination, which is not different from the actual broadcast communication. In addition, in the method disclosed in Japanese Patent Laid-Open No. 2002-368551, it is necessary to manage the terminals included in the group and their group addresses. When the number of terminals and the number of groups increase, the participation / registration procedure and the group address There was a problem that management became complicated.

  The present invention has been made to solve the above-described conventional problems. In the control station, when the distribution destination is one terminal, the distribution is made to that terminal, and the distribution request is received from another terminal. If this happens, it is possible to reduce the processing load on the control station and the terminal by changing the address of the terminal to the address of the terminal that has already been distributed, and to provide a communication network system that enables efficient use of the network. Objective.

  In order to solve the above problems, a communication network system according to claim 1 of the present invention is a communication network system comprising at least one terminal connected to a network and a control station that manages the terminal, wherein the control station Manages packet management means for generating transmission packets and analyzing contents of received packets, transmission / reception control means for controlling transmission / reception to / from the network, and managing the unique address and current change address of the connected terminal An address management means, wherein the terminal is a packet management means for generating a transmission packet and analyzing the contents of the received packet; a transmission / reception control means for controlling transmission / reception to / from the network; and an address for managing address information of the own station Management means, and the control station distributes data by the address management means. Is determined to be one terminal, and when it is determined that the data distribution destination is a plurality of terminals, the address management means determines the address of the terminal that has already distributed the data. The packet management unit creates a notification packet to be acquired and changed to the address, transmits the notification packet to the network by the transmission / reception control unit, and the terminal on the receiving side transmits the notification packet by the transmission / reception control unit. The notification packet is received, the packet management unit identifies that the notification packet is an address change notification, the address management unit changes the address of the local station, and the packet transmitted to the changed address is received. It is characterized by starting.

  The communication network system according to claim 2 of the present invention is the communication network system according to claim 1, wherein when the terminal transmits a data distribution stop request packet from the terminal whose address has been changed, it The address is acquired by the address management means, the unique address is given to the packet by the packet management means, and the packet is transmitted to the network by the transmission / reception control means.

  The communication network system according to claim 3 of the present invention is the communication network system according to claim 2, wherein the terminal has a destination address of the received packet managed by the address management means, and the terminal The packet is received by the transmission / reception control means if it is a participating group address or the changed address, and the packet is discarded if it is not the unique address, the group address or the changed address. It is a feature.

  A communication network system according to a fourth aspect of the present invention is the communication network system according to the first aspect, wherein the address is information indicating a unique address or a group address, and is obtained by converting the unique address of the terminal. The group address is characterized in that the terminal participates from the time of activation.

  According to the communication network system of the present invention, in the communication network system including at least one terminal connected to the network and a control station that manages the terminal, the control station generates and receives a transmission packet. Packet management means for analyzing packet contents, transmission / reception control means for controlling transmission / reception to / from the network, and address management means for managing the unique address and current change address of the connected terminal, A packet management means for generating a transmission packet and analyzing the contents of the received packet; a transmission / reception control means for controlling transmission / reception to / from the network; and an address management means for managing address information of the own station. The address management means determines that the data distribution destination is one terminal. If the address is distributed to the terminal and the data distribution destination is determined to be a plurality of terminals, the address of the terminal that has already distributed the data is acquired by the address management means and changed to the address The notification packet is generated by the packet management means, the notification packet is transmitted to the network by the transmission / reception control means, and the terminal on the receiving side receives the notification packet by the transmission / reception control means, and the packet management means To identify that the notification packet is an address change notification, change the address of the own station by the address management means, and start receiving packets sent to the changed address. Even if there are multiple URLs, the distribution terminal only needs to distribute to a specific address, and address management becomes easy. , The control station, to reduce the processing load of the terminal, the effect is obtained that allows the efficient use of the network.

The communication network system of the present invention will be described in detail below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a configuration diagram of a communication network system according to Embodiment 1 of the present invention.
In FIG. 1, reference numeral 101 denotes a control station that manages a communication network, and is a terminal that distributes data. Reference numerals 102, 103, and 104 denote first to third terminals that respectively receive data, and reference numeral 105 denotes a communication network in which the control station 101 and the first to third terminals 102 to 104 are connected via a communication network medium. It is.

FIG. 2 is a block diagram showing a basic internal configuration of control station 101 of the communication network system according to Embodiment 1 of the present invention.
In FIG. 2, 201 is a packet management unit that generates and analyzes packets, 202 is a transmission / reception control unit that has an interface with the network and controls transmission / reception of packets, and 203 is connected in the communication network 105. It is an example of an address management unit that manages the addresses of the first to third terminals 102 to 104.

FIG. 3 is a block diagram showing a basic internal configuration of first to third terminals 102 to 104 of the communication network system according to the first embodiment of the present invention.
In FIG. 3, 301 is a packet management unit that generates and analyzes packets, 302 is a transmission / reception control unit that controls the transmission / reception of packets with an interface with the network, and 303 is address information of the local station. 2 is an example of an address management unit that manages

  The transmission / reception control unit 302 performs packet reception processing when the destination of the received packet is a unique address of a terminal managed by the address management unit 303, a group address in which the terminal participates, or a changed address. If not, discard it.

  4-7 is a figure which shows the control procedure in the case of data distribution to the 1st-3rd terminal from the control station of the communication network system by Embodiment 1 of this invention, The component of a system is This is the same as that shown in FIGS. In the figure, the vertical axis represents time, the time passes downward, and the horizontal axis represents the operation of each terminal at each time point or the state thereof.

Hereinafter, the delivery start control procedure will be described.
In FIG. 4, when the first terminal 102 determines that it wants to receive the data distribution service, the packet management unit 301 of the first terminal 102 first creates a data distribution request packet addressed to the control station 101, The data is transmitted to the communication network 105 by the transmission / reception control unit 302 of the terminal 102 (401). The control station 101 receives the packet by the transmission / reception control unit 202, identifies the data distribution request by the packet management unit 201, recognizes that the data is not yet distributed by the address management unit 203, and Information indicating distribution to the terminal 102 is recorded (402), a packet for distribution is created by the packet management unit 201, and the packet is transmitted to the address A of the first terminal 102 by the transmission / reception control unit 202. Is started (403).

  Next, when the third terminal 104 determines to receive the data distribution service while performing data distribution to the first terminal 102, the packet management unit 301 of the third terminal 104 performs control. A data distribution request packet is created for the station 101 and transmitted to the communication network 105 by the transmission / reception control unit 302 of the third terminal 104 (404). The control station 101 identifies that the packet management unit 201 is a data distribution request from the third terminal 104, recognizes that the address management unit 203 is distributing to the first terminal 102, and It is decided to change the address C of the third terminal 104 to the address A of the first terminal 102, and the information is recorded in the address management unit 203 (405). After that, the packet management unit 201 creates an address change packet, and the transmission / reception control unit 202 starts packet transmission to the third terminal 104 (406). The packet received by the transmission / reception control unit 302 of the third terminal 104 is recognized by the packet management unit 301 as an address change notification, and the address management unit 303 changes the address of the local station to the first terminal 102 ( 407).

Table 1 shows an example of information managed by the address management unit 203 of the control station 101 in the address management process 405 of FIG. Table 2 shows an example of information managed by the address management unit 303 of the third terminal 104 in the address management process 407 of FIG.

  Table 1 shows that data is distributed to the first terminal 102, and the unique address of the third terminal 104 is changed to A, which is the unique address of the first terminal 102. The unique address of the third terminal 104 is C, the group address GrpC that can be obtained by converting the unique address C, and the current address is A.

  Here, the control station 101 that has transmitted the address change notification to the third terminal 104 continues to distribute data addressed to the first terminal 102, so that the first terminal 102 matches the unique address of its own station. Therefore, the transmission / reception control unit 302 of the first terminal 102 receives the packet addressed to the address A of the first terminal 102 (408), and the third terminal 104 sets its own address to that of the first terminal 102. Since the address A is changed, the transmission / reception control unit 302 of the third terminal 104 can receive a packet addressed to the address A of the first terminal 102 (409). Therefore, the processing load on the control station 101, the first and third terminals 102 and 104 can be reduced, and the network can be used efficiently.

Next, the delivery stop control procedure will be described.
In FIG. 5, the control station 101 notifies the second terminal 103 and the third terminal 104 to change to the address A of the first terminal 102 (501), and receives the second terminal 103 and The third terminal 104 has changed its own station address to the address A of the first terminal 102 (502, 503), and the control station 101 distributes data to the address A of the first terminal 102, The first terminal 102, the second terminal 103, and the third terminal 104 are receiving data (504 to 506).

  At this time, if the second terminal 103 decides to stop the reception in the data distribution, the address A of the own station changed by the address management unit 303 of the second terminal 103 is canceled (507), and the second terminal 103 The packet management unit 301 of the terminal 103 creates a packet addressed to the control station 101 that means a distribution stop request, acquires the unique address B of the own station using the address management unit 303, and the packet management unit 301 uses the unique address. B is added to the packet (not shown) and transmitted by the transmission / reception control unit 302 (508).

  The control station 101 that has received the packet by the transmission / reception control unit 202 recognizes that the packet management unit 201 is a distribution stop request from the second terminal 103, and the address management unit 203 changes the changed address of the second terminal 103. A is invalidated (509).

  When the control station 101 continues to distribute data to the first terminal 102, the first terminal 102 can receive data because it matches the unique address A (510), and the third terminal Since the change address 104 is the address A of the first terminal 102, data can be received (511). However, the second terminal 103 invalidates the change address A, so that the unique address of its own station is obtained. Since it does not match B, no data is received. Therefore, when the second terminal 103 stops receiving data distribution after changing the own address of the second and third terminals 103 and 104 to the address A of the first terminal 102, a packet to that effect is sent. By transmitting to the control station 101, data distribution to the second terminal 103 among a plurality of data distribution destinations can be stopped, and data distribution to the first and third terminals 102 and 104 can be continued. The processing load on the control station 101 and the first to third terminals 102, 103, and 104 is reduced, and the network can be used efficiently.

Next, another delivery stop control procedure will be described.
In FIG. 6, the control station 101 notifies the second terminal 103 and the third terminal 104 to change to the address A of the first terminal 102 (601), and receives the second terminal 103 and Each of the third terminals 104 changes its own unique address to the address A of the first terminal 102 (602, 603), and the control station 101 distributes data to the address A of the first terminal 102. The first terminal 102, the second terminal 103, and the third terminal 104 are receiving data (604 to 606).

  At this time, if the first terminal 102 decides to stop reception in data distribution, the packet management unit 301 of the first terminal 102 creates a packet addressed to the control station 101 that means a distribution stop request, and performs transmission / reception control. The data is transmitted to the control station 101 by the unit 302 (607).

  The control station 101 that has received the packet at the transmission / reception control unit 202 recognizes that the packet management unit 201 is a distribution stop request from the first terminal 102, and is currently distributing to the first terminal 102 at the address management unit 203. Delete the information that is. Here, the control station 101 identifies in the address management unit 203 that each of the second terminal 103 and the third terminal 104 is currently changing its own address to the address A of the first terminal 102. (608, 610), packet management (609) for releasing the address change for the second terminal 103 and packet (612) for changing the address B of the second terminal 103 to the third terminal 104. Created in unit 201, transmitted to communication network 105 in transmission / reception control unit 202, transmits an address change release packet (609) to second terminal 103, and sends an address change request packet (612) to third terminal 104.

  The second terminal 103 that has received the address change release packet (609) by the transmission / reception control unit 302 identifies that the packet change is in the packet management unit 301, and releases the address change of its own station (611). Also, the third terminal 104 that has received the address change request packet (612) by the transmission / reception control unit 302 recognizes that the packet management unit 301 is an address change request, and sets the address of its own station to the second terminal 103. Change to address B (613).

  The control station 101 can distribute the data to the second terminal 103 and the third terminal 104 by distributing the data to the second terminal 103 (614, 615). In addition, the processing load on the first to third terminals 102, 103, and 104 can be reduced, and the network can be used efficiently.

Next, another distribution start control procedure will be described.
FIG. 7 shows a data distribution procedure in the case of using communication network means for returning a reception confirmation packet when a packet such as IEEE 802.11 is received. Here, when IEEE802.11 is used, if the address of a terminal is changed to the address of another terminal, reception confirmation packets are simultaneously transmitted from a plurality of terminals for one packet, and the reception confirmation packet is received on the reception side. Cannot be received correctly.

  In FIG. 7, it is recorded that the control station 101 that has received the data distribution request (701) from the first terminal 102 transmits to the address management unit addressed to the address A of the first terminal 102 (702). The procedure from the start of data distribution to one terminal 102 (703) is the same as 401 to 403 in FIG.

  After that, the control station 101 that has received the data distribution request (704) from the third terminal 104 in the transmission / reception control unit 202 identifies that the request is a data distribution request in the packet management unit 201, and the address management unit 203 Instead of changing the address of the terminal 104 to the address A of the first terminal 102, it is determined and recorded to change to the group address GrpA of the first terminal 102 (705). A notification packet to be changed to a GrpA address is created for the terminal 104 of the mobile station, and is transmitted to the communication network 105 by the transmission / reception control unit 202 (706).

  The third terminal 104 that has received the packet by the transmission / reception control unit 302 recognizes that the request is to change the address to GrpA by the packet management unit 301, and changes the address of its own station to GrpA by the address management unit 303. (707).

  The control station 101 changes the data distribution destination address that has been addressed to the address A of the first terminal 102 so far to GrpA in the packet management unit 201, and transmits it to the communication network 105 in the transmission / reception control unit 202. The transmission / reception control units 302 of the first terminal 102 and the third terminal 104 coincide with the group address in which the local station participates and match the address of the local station, and thus start reception processing (708, 709). ). Since the transmission / reception control unit 302 of the second terminal 103 does not match the group address of the own station and the changed address of the own station, it does not perform reception processing. As a result, the control station 101 distributes the data to the GrpA address so that the first terminal 102 and the third terminal 104 can receive the data, and the control station 101 and the first and third terminals 102 and 104 can receive the data. The processing load is reduced and the network can be used efficiently.

  In the first embodiment, the control station 101 performs communication network management and data distribution. However, the control station 101 may manage the communication network and the terminal may perform data distribution.

  The address is information indicating a unique address or a group address, and the group address is obtained by converting the unique address of the terminal, and the terminal participates from the time of activation.

  As described above, according to the first embodiment, in the communication network system including the first to third terminals 102 to 104 connected to the network 105 and the control station 101 that manages the terminals, the control station 101 Includes: a packet management unit 201 that generates transmission packets and analyzes the contents of received packets; a transmission / reception control unit 202 that controls transmission / reception to / from the network; and a unique address and a current change address of the connected terminal. The first to third terminals 102 to 104 include a packet management unit 301 that performs transmission packet generation and content analysis of received packets, and transmission / reception that controls transmission / reception to the network. A control unit 302; and an address management unit 303 that manages address information of the local station. When the address management unit 203 determines that the data distribution destination is the first terminal 102, the address management unit 203 distributes the data to the terminal, and determines that the data distribution destination is the first and third terminals 102 and 104. If the address management unit 203 acquires the address of the first terminal 102 that has already distributed data, the packet management unit 201 creates a notification packet for changing to the address, and the transmission / reception control The third terminal 104 on the receiving side receives the notification packet by the transmission / reception control unit 302, and the packet management unit 301 changes the address of the notification packet. The address management unit 303 assigns the address of the local station to the address of the first terminal 102. It is possible to reduce the processing load on the control station and the first to third terminals and to make efficient use of the network possible. effective.

  The distribution data may be any signal as long as it is a digitized signal that requires real-time characteristics, such as a moving image signal or an audio signal, and the communication network means supports the multicast function. In this embodiment, 100BASE-T Ethernet (registered trademark) (IEEE 802.3u) having a transmission rate of 100 Mbps is used, and the control station and the terminal are connected via a repeater.

  In addition, the address used in Ethernet (registered trademark) has a bit indicating a unique / group. In the first embodiment, for example, the unique address A of the first terminal 102 is uniquely determined in the communication network. The unique / group bit is “0”. Further, it is assumed that the unique / group bit of the address of the first terminal 102 is set to “1” for the group address GrpA in which the first terminal 102 participates.

  The communication network system according to the present invention is useful for a communication network system having an effect of reducing the processing load on the control station and the terminal and enabling efficient use of the network.

It is a block diagram of the communication network system in Embodiment 1 of this invention. It is a figure which shows the basic internal structure of the control station of the communication network system in Embodiment 1 of this invention. It is a figure which shows the basic internal structure of the terminal of the communication network system in Embodiment 1 of this invention. It is a figure which shows the delivery start control procedure of the communication network system in Embodiment 1 of this invention. It is a figure which shows the delivery stop control procedure of the communication network system in Embodiment 1 of this invention. It is a figure which shows the delivery stop control procedure of the communication network system in Embodiment 1 of this invention. It is a figure which shows the delivery start control procedure of the communication network system in Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Control station 102 1st terminal 103 2nd terminal 104 3rd terminal 105 Communication network 201 Packet management part of control station 202 Transmission / reception control part of control station 203 Address management part of control station 301 Packet management part of terminal 302 Terminal Transmission / reception control unit 303 terminal address management unit 401 distribution request packet 402 address management processing 403 data distribution packet 404 data distribution request packet 405 address management processing 406 address change notification packet 407 address management processing 408 data distribution packet 409 data distribution packet 501 address Management processing 502 Address management processing 503 Address management processing 504 Data distribution packet 505 Data distribution packet 506 Data distribution packet 507 Address management processing 508 Data Distribution stop packet 509 Address management processing 510 Data distribution packet 511 Data distribution packet 601 Address management processing 602 Address management processing 603 Address management processing 604 Data distribution packet 605 Data distribution packet 606 Data distribution packet 607 Data distribution stop packet 608 Address management processing 609 Address Change release packet 610 Address management processing 611 Address management processing 612 Address change request packet 613 Address management processing 614 Data distribution packet 615 Data distribution packet 701 Distribution request packet 702 Address management processing 703 Data distribution packet 704 Data distribution request packet 705 Address management processing 706 Address change notification packet 707 Address management processing 708 Data distribution Packet 709 Data distribution packet

Claims (4)

In a communication network system comprising at least one terminal connected to a network and a control station that manages the terminal,
The control station
Packet management means for generating transmission packets and analyzing contents of received packets, transmission / reception control means for controlling transmission / reception to / from the network, and address management for managing the unique address and current change address of the connected terminal With means,
The terminal
A packet management unit for generating a transmission packet and analyzing the contents of the received packet; a transmission / reception control unit for controlling transmission / reception to / from the network; and an address management unit for managing address information of the own station,
The control station
When the address management means determines that the data distribution destination is one terminal, the data is distributed to the terminal. When the data distribution destination is determined to be a plurality of terminals, the data is already distributed. Obtaining the address of the terminal by the address management means, creating a notification packet for changing to the address by the packet management means, transmitting the notification packet to the network by the transmission / reception control means,
The terminal on the receiving side is:
The transmission / reception control means receives the notification packet, the packet management means identifies that the notification packet is an address change notification, the address management means changes its own address, and transmits it to the changed address Start receiving received packets,
A communication network system characterized by the above. The communication network system according to claim 1,
The terminal
When transmitting a data distribution stop request packet from the terminal whose address has been changed, the unique address of the local station is acquired by the address management means, the unique address is given to the packet by the packet management means, and the transmission / reception is performed. Sending the packet to the network by control means;
A communication network system characterized by the above. The communication network system according to claim 2,
The terminal
If the destination of the received packet is a unique address of the terminal managed by the address management means, a group address in which the terminal participates, or the changed address, the packet is received by the transmission / reception control means, Discard the packet if not the unique address, the group address, or the changed address;
A communication network system characterized by the above. The communication network system according to claim 1,
The address is information indicating a unique address or a group address,
The terminal participates in the group address obtained by converting the unique address of the terminal from the time of startup,
A communication network system characterized by the above.

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