JP2000244513A - Network system, method and device for transmitting and receiving data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the version-up of a protocol software without caring of compatibility and depending on a hardware on a network. SOLUTION: Concerning a network system to use the network protocol so as to transfer version information between adjacent nodes by transmitting/ receiving data after reserving and securing network resources in the case of data transmission/reception, the network protocol software is composed of a program portion composed of a device driver part depending on an operating system(OS) and the other OS depending part and a program portion composed of a download program part, a program loader part and an intermediate language interpreter part described in an intermediate language non-depending on the OS. Each node connected to the network updates the version information of its own network protocol software by downloading the program portion non-depending on the OS from the adjacent node when that version information is former than that of the adjacent node.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network system that uses a network protocol that guarantees transfer speed and performs non-delayed transfer by reserving network resources for signal transmission and reception and performing signal transmission and reception after securing the network resources. And a data transmission method and apparatus suitable for the network.

[0002]

2. Description of the Related Art Hitherto, a technology for guaranteeing a transfer rate and realizing data transfer without delay by reserving network resources, for example, a used band and performing communication occupying the reserved band has been known as QoS (QoS). Quality of Servic
e) and so on. Actually, in order to guarantee the above-mentioned transfer rate and realize data transfer without delay, a signaling protocol for determining a route on a network and securing network resources is required.
As a typical example of the signaling protocol, in a so-called ATM (asynchronous transfer mode) network, UNI3. x / 4.0, RSVP (Resource reSerVation Protocol) for IP datagrams
Etc. are known.

[0003]

By the way, a signaling protocol for dynamically reserving network resources is as follows.
The specifications are constantly changing due to the software version upgrade and standardization process, and it is difficult to maintain compatibility. That is, if the type of the signaling protocol software is different, compatibility cannot be maintained, and even if the type is the same, operation is often impossible if the version is different.

[0004] Further, the signaling protocol software needs to be supported by network devices such as routers and switches on the network, and if it is not supported, it cannot operate. Conversely, the version upgrade of the signaling protocol software depends on the hardware on the network.

Accordingly, the present invention has been made in view of such circumstances, and it is possible to upgrade the protocol software without worrying about compatibility, and to update the version without depending on hardware on a network. It is an object of the present invention to provide a network system, a signal transmission / reception method, and a device that can be upgraded.

[0006]

SUMMARY OF THE INVENTION A network system according to the present invention uses a network protocol capable of transmitting and receiving data after reserving and securing network resources for data transmission and reception, and transferring version information between adjacent nodes. A system comprising a plurality of nodes storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code independent of each other, wherein each node is connected to a network protocol software of an adjacent node. The version information of the network protocol software is compared with the version information of its own, and when its own version information indicates the old version, the program described by the intermediate code from the adjacent node Receiving a minute, it interprets the program portion is described by the intermediate code the received, by updating the network protocol software indicating the older version of the self, solving the above problems.

A data transmission / reception method according to the present invention provides a data transmission / reception method for a network system which uses a network protocol capable of transferring version information between adjacent nodes while reserving and securing network resources for data transmission / reception. And stores network protocol software having at least a platform-dependent program part and a program part described by an intermediate code not dependent on the network protocol software version information of the adjacent node and the version information of its own network protocol software. When the own version information indicates an old version, a program part described by an intermediate code is received from an adjacent node, and the received intermediate code It interprets the program part to be mentioned,
The above-mentioned problem is solved by updating the network protocol software indicating its own old version.

A data transmission / reception device of the present invention transmits and receives data after reserving and securing network resources for data transmission / reception, and a data transmission / reception device of a network system using a network protocol capable of transferring version information between adjacent nodes. Software storage means for storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code which is independent of, a transmission / reception means for transmitting / receiving data via a network, and network protocol software And software execution means for executing network protocol software version information of an adjacent node and its own network protocol software. Comparing the wear version information, when the version information of the self indicates the old version,
The above-described problem is solved by receiving a program part described by the intermediate code of the adjacent node, interpreting the program part described by the received intermediate code, and updating the network protocol software indicating its own old version. I do.

A data transmission / reception method according to the present invention provides a data transmission / reception method for a network system which uses a network protocol capable of transferring version information between adjacent nodes while reserving and securing network resources for data transmission / reception. And stores network protocol software having at least a platform-dependent program part and a program part described by an intermediate code not dependent on the network protocol software version information of the adjacent node and the version information of its own network protocol software. And when the own version information indicates a new version, by transmitting the program portion described by the own intermediate code to the adjacent node, To solve the problems.

A data transmission / reception device of the present invention transmits and receives data after reserving and securing network resources for data transmission / reception, and a data transmission / reception device of a network system using a network protocol capable of transferring version information between adjacent nodes. Software storage means for storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code which is independent of, a transmission / reception means for transmitting / receiving data via a network, and network protocol software And software execution means for executing network protocol software version information of an adjacent node and its own network protocol software. Compared with the hardware version information, when the version information of self indicates the new version,
The above-described problem is solved by controlling transmission of a program portion described by its own intermediate code to an adjacent node.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a system configuration as an embodiment of a network system, a signal transmitting / receiving method and an apparatus according to the present invention. FIG. 1 shows an ATM network and IEEE (The Institute of Electrical and Electronics).
bus standard (IEEE Std. 1394-1995 IEEE Standard for a High P) approved by tronics Engineers, Inc.
erformance serial Bus standard. Hereinafter, IEEE 1394
Standards. ) Compliant network (hereinafter IEEE)
An E1394 network is used. 3) shows an example of a system configuration in which data transfer is performed between the system. In addition,
A description of the ATM and the IEEE 1394 standard will be described later.

In the system configuration shown in FIG. 1, the host computer 2 uses IEEE as data transmission / reception means.
A card slot 7 for a 1394 network interface card (hereinafter referred to as NIC);
NIC card slot 8 is provided. The IEEE 13 is installed in the card slot 7 of the host computer 2.
94 NIC is inserted and the IEEE1394
Are connected to the digital video camera 1, for example. An ATM NIC is inserted into the card slot 8, and the ATM NIC is connected to an ATM switch (router) 6. That is, the host computer 2 controls the digital video camera 1 via the IEEE 1394 NIC, and also controls the digital video camera 1 via the IEEE 1394 NIC.
It is a bridge between the 1394 network and the ATM network.

The host computer 3 has an ATM NIC card slot 9 as data transmission / reception means. Card slot 9 of the host computer 3
Has an ATM NIC inserted therein.
The IC is connected to the ATM switch 6. This host computer 3 controls the ATM switch 6 via the ATM NIC.

The host computer 4 has an ATM NIC card slot 10 as data transmission / reception means. An ATM NIC is inserted into the card slot 10 of the host computer 4, and the ATM
Are connected to the ATM switch 6.

The host computer 5 has an ATM NIC card slot 11 as data transmission / reception means. An ATM NIC is inserted into the card slot 11 of the host computer 5, and the ATM
Are connected to the ATM switch 6.

Each of the host computers 2, 3, 4,
Numeral 5 executes various processes in the present embodiment by a processor provided therein, generates and analyzes various messages, and can hold various applications and data on a hard disk or the like.

As described above, in the system configuration of FIG.
An ATM network is configured with an ATM NIC inserted in each of the host computers 2 to 5, and the host computer 2 is connected to the IEEE 1394 network and the AT.
It is a bridge to the M network. The host computer 2 converts, for example, image and audio data captured by the digital video camera 1 into IEEE 139.
4 and real-time transfer to, for example, host computers 4 and 5 via an ATM network.

Here, in the network system according to the embodiment of the present invention, the bandwidth of the network resources is reserved (reserved and reserved) in advance via the ATM or the IEEE 1394 network, so that there is no data delay and reliability. By employing a signaling protocol for realizing high-speed communication, real-time transfer of data from the digital video camera 1 to the host computers 4 and 5 via the IEEE1394 and ATM networks is realized.

As the above signaling protocol, A
A signaling protocol via IP for dynamically securing the bandwidth of a network such as TM, IEEE 1394, etc.,
TCP / UDP (Transmission Control Protocol / user
datagram protocol) and the like, and a communication protocol that makes the best use of the reserved bandwidth can be considered. In the following description of the present embodiment, the former signaling protocol is used as an example. explain.

In the signaling protocol employed in the present embodiment, network bandwidth reservation can be made from either the transmitting terminal side or the receiving terminal side.

The operation in the case where the transmission terminal makes a network bandwidth reservation will be briefly described below. Note that, here, a more generalized example will be described using a network in which a gateway router is provided between a transmitting terminal and a plurality of receiving terminals as an example.

First, the application of the transmitting terminal requests that a QoS guarantee be given to a communication path (hereinafter, referred to as a flow) for transmitting and receiving certain data. At this time, the transmitting terminal specifies a receiving terminal list and a request for QoS guarantee. At this time, the flow is specified by, for example, the IP address of the transmitting terminal, the TCP / UDP port number of the transmitting terminal, the IP address of the receiving terminal, and the TCP / U of the receiving terminal.
This is performed by a set of DP port numbers. The receiving terminal list is a list of unicast IP addresses. Also,
The QoS guarantee request is described by a service class and a traffic profile (specified by a parameter of the token bucket algorithm).

Next, the transmitting terminal generates a network bandwidth reservation ID (flow ID), and sends a message (hereinafter, referred to as an open message) requesting the transmitting terminal to establish a flow to the gateway router. In the open message, a flow ID, a receiving terminal list, a request for QoS guarantee, and the like are described. The exchange of messages between nodes is performed using a reliable transport protocol (for example, TCP or the like). When the link is an ATM, setup of a VC (Virtual Channel) can also be performed by the signaling protocol. That is, according to the signaling protocol, a vacant VCI (Virtual Channel Identifie
Select r) and write the selected VCI in the open message.

The gateway router connected to the receiving terminal determines an output interface for each receiving terminal,
Check whether each output interface has sufficient resources (network bandwidth). When the resources are sufficient, the router copies the open message for each output interface and transfers it to the receiving terminal. If the link is an ATM, the router selects an ATM VCI for each interface. On the other hand, when the resources are insufficient, the router returns a message for denying the route (hereinafter, referred to as a reject message) to the transmitting terminal.

When the receiving terminal that has received the open message from the router can accept the reservation of the resource (network band), it returns a message affirming the route (hereinafter, referred to as an accept message) to the router. If not, it returns a reject message to the router.

At this time, if at least one accept message returns from the receiving terminal to the router, the resource (network band) reservation is established. On the other hand, if the reject message returns from all receiving terminals, the reservation is canceled. The accept and reject messages received by the router are forwarded to the sending terminal.

Next, a brief description will be given of the operation when the receiving terminal makes a network bandwidth reservation. The following description also exemplifies a more generalized network in which a gateway router is provided between a transmitting terminal and a plurality of receiving terminals.

First, the application of the receiving terminal obtains a flow ID (including the IP address of the transmitting terminal) and a request for QoS guarantee using an external framework. The receiving terminal sends the flow ID to a message (hereinafter, referred to as a join message) indicating the intention to make a resource reservation.
And a request for QoS guarantee are written and transmitted to the transmitting terminal.

When the join message from the receiving terminal arrives at the router where the reservation corresponding to the flow ID already exists or at the transmitting terminal itself, an accept or reject message is returned from those nodes to the receiving terminal. Here, when the receiving terminal makes a network bandwidth reservation, the accept message returned from the transmitting terminal in response to the join message from the receiving terminal is particularly called a reverse reservation message. When this reverse reservation message is returned to the receiving terminal, it means that the receiving terminal has secured the network bandwidth.

As described above, the signaling protocol employed in the present embodiment uses a reliable communication protocol (for example, TCP or the like) to secure a route through which an IP datagram flows in advance, and This is a signaling protocol for reserving resources, and in the case of the present embodiment, is configured as a daemon program that operates on FreeBSD (2.2.7-RELEASE) installed on a PC / AT compatible machine, for example. ing.

Here, in the signaling protocol employed in the present embodiment, the following method can be used particularly when dynamically securing the bandwidth of an ATM network or an IEEE 1394 network.

In the case of an ATM network, a VC (Virtual Channel) determined for each flow (communication path between a transmitter and a receiver for which resources have been secured) between the transmitting terminal and the receiving terminal.
1) is arranged inside the ATM cell, and when the corresponding IP datagram flows, the ATM data link layer is bypassed in a predetermined band and flows. In addition, IE
In the case of the EE1394 network, the VCID value is mapped to the channel number, and when a corresponding IP datagram flows, a determined band is transferred using synchronous transfer.

By the way, as described above, the signaling protocol employed in the present embodiment is FreeBSD (2.2.
7-RELEASE), but its specifications may change in the future due to, for example, software version upgrades and standardization work. Also, considering that it can be scaled on a network, FreeBS
It is desirable to be able to handle OSs (operating systems) other than D.

In view of the above, in the present embodiment, the software configuration of the signaling protocol is as shown in FIG.

That is, the signaling protocol software employed in the present embodiment includes a device driver unit dependent on the OS, an OS dependent unit (OS wrapper processing unit for the application) dependent on the OS, etc., and an intermediate language described later. Program loader for downloading programs written in etc., downloaded software (programs written in intermediate language, etc.)
It is composed of an intermediate language interpreter section for interpreting, and a software body (download program section) to be downloaded. The device driver unit is connected to an ATM or IEEE1394 N via a PCI bus, for example.
Connected to an IC (ie, hardware).

Note that, on the network, for example, SIP (Status Inf) is used between nodes that have started the daemon program of the signaling program employed in the present embodiment.
Ormation Protocol) to check whether the daemon program process is functioning. This is because, for example, when a process of a daemon program of an adjacent node is not functioning, a predetermined path disconnection process is performed.

In the above-described signaling program having a software configuration, version information of software of the signaling protocol can be exchanged between adjacent nodes on the signaling protocol.

That is, for example, when the node having the old version of the daemon program and the node having the new version of the daemon program are connected adjacent to each other, the old version of the daemon program becomes The program loader unit downloads a part of the program described in, for example, an intermediate language that does not depend on the OS from the daemon program. The intermediate language may be, for example, a so-called Java language developed by Sun Microsystems. In the Java programming, an object is created by compiling the source in the same manner as in the C language or the C ++ language. When compiling the C language or the C ++ language, a specific platform (for example, for SPARC or x86) is used. In contrast, the Java language compilation creates a bytecode file for a virtual machine that is independent of a specific platform. The bytecode file is Java
The interpreter a interprets and executes the program. After that, if there is a Java interpreter that runs on each platform, the program runs on all platforms. At present, the Java interpreter is a so-called Windows operating system of Microsoft Corporation or a Macintosh (so-called Mac O.S.
S), SUN, Linux and the like have been developed for various platforms. Therefore, in the present embodiment, a platform-independent program is realized by using the Java language as the intermediate language.

Next, the software described in the downloaded intermediate language is written to a predetermined file position. The daemon program that has downloaded the new version of the program terminates the process and restarts. After the restart, the intermediate language interpreter interprets and executes the download program written at the predetermined file position. This completes the upgrade of the old version of the daemon program.

As described above, according to the present embodiment, in a node having the above-mentioned daemon program, the version difference between the daemon program of the adjacent node and the node program of the adjacent node is always investigated. In such a case, the program is rewritten to a new version. Therefore, when a plurality of nodes are connected to the network, the new version of the daemon program can propagate on the network.

Next, referring to FIG. 3, in the network system according to the present embodiment, the flow from checking the version between adjacent nodes, upgrading the old version to the new version, and restarting as described above. Will be described below.

In FIG. 3, at a certain node on the network, the initial MES (Message Ex
(Change Signal) As initialization processing, initialization for securing a communication path for a message is performed. After this step S1,
Proceed to step S2.

In step S2, the node confirms whether or not the daemon program process is functioning between the adjacent nodes within a predetermined time. If the node program cannot be confirmed in the predetermined time, the node proceeds to step S3. Is released, and the process ends. If it can be confirmed within a predetermined time, step S
At 4, the SIP response is received.

Next, in steps S5 and S6, the node determines whether the software version of the node is the old version or the new version. If the node is the old version, the node proceeds to the process in step S7. If it is the version, the process proceeds to step S8, and if there is no change in the version, the process returns to step S2.

If it is determined in step S5 that the version is the old version, the downloader unit receives the new version of the download program from the adjacent node in step S7, and then restarts in step S9.
Thereafter, the process returns to step S1.

On the other hand, if it is determined in step S6 that the current version is the new version, the download program of the new version is transmitted to the adjacent node in step S8, and thereafter, the process returns to step S1.

In the above example, the network is configured via the NIC of the host computer (node), and the signaling protocol is software on the host computer. Network devices such as switches and routers are so-called embedded software, and the programs must be independently incorporated by network vendors.

Accordingly, the present invention also includes a mechanism for downloading a program and a function of checking the version of an adjacent program and replacing an old version with a new version if any, even in these embedded devices.

FIG. 4 shows a software configuration in that case.

That is, similarly to the configuration of FIG. 2, the software configuration shown in FIG. 4 is described in an intermediate language and the like, including an OS-dependent device driver unit, an OS-dependent unit dependent on another OS, and the like. A program loader section for downloading a program, an intermediate language interpreter section for interpreting the downloaded software, and a software body to be downloaded (download program section)
And the device driver unit is an ATM or an I / O
It is directly connected to EEE1394 switch and router hardware.

As described above, according to the system of the embodiment of the present invention, for example, the latest signaling protocol program can always be detected on the network, and if there is an old version, it can be rewritten to a new version. . Thus, by installing the latest signaling protocol program in, for example, one node on the network, it is possible to upgrade the programs of all nodes on the network. Further, according to the system of the embodiment of the present invention, since the software of all the nodes is upgraded, it is not necessary to consider compatibility with the old version. Further, according to the system of the embodiment of the present invention, the node whose software has been upgraded
Since the language is described in an intermediate language such as a, the scalability can be improved without depending on the platform of the hardware (OS or the like). Further, according to the system of the embodiment of the present invention, it is not necessary to download all the programs of the signaling program at the time of version upgrade, so that the load due to communication can be minimized.

The ATM and the IEEE 1394 standard applied to the network system of the embodiment will be described below.

In the ATM, in order to enable the same information transfer processing regardless of the communication speed, routing information is added to a header portion called an ATM cell header for each fixed-length transfer information called an ATM cell. Multiplexing and routing of information.

The ATM cell header has a configuration as shown in FIG. GFC (General Flow Control) is used for flow control on a user / network interface. A VPI (Virtual Path Identifier) and a VCI (Virtual Channel Identifier) are used for identifying an ATM connection, and further, a PT (Payload Ty).
The assignment of “pe” enables notification of forward congestion at the cell level and the like. CLP (Cell Loss Prio
rity) indicates the priority of cell loss control that may be performed when congestion or the like occurs. HEC (Header E
rror Check) is a CRC having a 1-bit error correction and a multi-bit error detection capability for detecting and correcting a header error.
(Cycric Redundancy Check). An ATM cell header having such a configuration is compatible with OSI (Open Systems) that defines a protocol hierarchy.
A, which belongs to the so-called data link layer, in the basic reference model of Interconnection (open system interconnection)
This is specified by the TM layer.

OSI is, as shown in FIG. 6, a physical layer, a data link layer, a network layer, a transport layer, a session layer, a presentation layer,
It is divided into application layers and organized hierarchically. The physical layer defines physical standards such as the shape of the connector at the end of the cable used for connection and the number and type of pins, standards for electrical signals, and the like, and also includes standards related to optical communication. In the physical layer, a bit string consisting of 0 or 1 is exchanged. The data link layer plays a role in dividing the transmission of a bit string in the physical layer as a unit of meaningful information called a packet or a frame. The data link layer packetizes data, performs data transfer between adjacent systems together with an error detection code and order information of the packet, and controls transmission errors. The network layer is for relaying data transmission and routing control between network systems. In a wide area network, communication cannot be performed unless a route for transmitting data is established. Therefore, a route control based on a network address is performed in a network layer. The transport layer realizes a function for guaranteeing the quality of communication, for example, controlling retransmission to recover an error occurring during communication, or aligning the order of intermittently arriving packets. Things. The session layer controls communication so as to maintain an order as a dialogue (dialog). For example, the session layer controls transmission right and establishes synchronization. The presentation layer converts a character set, a character code, and a data structure. The application layer provides a service that can use an application program on a console such as a computer. For example, the application layer is used to provide functions such as e-mail, file transfer, and remote login.

In the above-described ATM layer, a 53-octet ATM cell including an ATM cell header and data is generated, and so-called cut-through transfer can be performed. In addition, in the ATM layer, when performing data transfer via the Internet, as shown in FIG. 7, an LLC / SNAP (Logical Link Control) is added to an IP datagram.
/ Sub-Network Access Protocol) header and AAL5 (ATM Adaptation Layer) for reassociation.
5) Generate packets consisting of multiples of 48 octets with trailers and padding added as needed. At the ATM layer, this packet is divided into 48 octet cells, and each cell has 5 octet A
With a TM cell header attached, 53 octets of ATM
A cell is formed and the ATM cell is transferred.

On the other hand, the IEEE 1394 standard is an interface standard that supports high-speed data transfer and real-time transfer for the purpose of an interface for multimedia data transfer. In the IEEE 1394 standard, a transfer operation performed in a network is called a subaction, and the following two types of subactions are defined. That is, as two sub-actions, a synchronous transfer mode that guarantees a transfer band called “isochronous” is defined.
An asynchronous transfer mode called "asynchronous" is defined. Such IEEE13
The header part of the packet in the 94 standard is different between “isochronous” and “asynchronous”.

The header part in "isochronous" (hereinafter referred to as "isochronous")
This is called a 1394 synchronization header. ) Has a configuration as shown in FIG. 8, and includes a data length indicating the size of a data block following the 1394 synchronization header, and a tag (isochronous data format) indicating a classification of a packet in an upper layer.
t tag) and channel (isochro)
nous channel) and sy (synchron
and a header_CRC indicating the CRC of the 1394 synchronization header.

The header part of "asynchronous" (hereinafter referred to as 1394 asynchronous header) has a configuration as shown in FIG. 9 and des which indicates the address of the receiving side.
t ID (destination ID), tl (transaction label) representing a transaction label, and rt (retry co
de), and tcode (tr
ansaction code) and pri indicating the priority of the packet.
(Priority) and srcID indicating the sender's address
(Source ID) and a header_CRC indicating the CRC of the 1394 asynchronous header. In addition, 1394
In the asynchronous header, as information specific to the packet type, for example, dest offset (destination offset)
And datalength and extended_tcod
e etc. are provided.

The 1394 synchronous header and the 1394 asynchronous header having such a structure are defined in the link layer belonging to the data link layer in the basic reference model of OSI. In the link layer, 1
A packet including a 394 synchronous header or a 1394 asynchronous header and data is generated and transferred. In the link layer, when data is transferred via the Internet, as shown in FIG. 10, after a fragment header for reassembly is added to an IP datagram,
A packet is formed by adding a 94 synchronous header or a 1394 asynchronous header, and the packet is transferred. In the link layer, at the time of forming the packet, the IP datagram is divided according to, for example, a transfer rate or a band reserved for use in data transmission.
A fragment header and a 1394 synchronous header or a 1394 asynchronous header are added to the datagram to form a plurality of packets.

In the above embodiment, the ATM and the IE are used.
Although a network composed of EE1394 has been described as an example, the present invention is not limited thereto, and it is needless to say that the present invention can be applied to other networks.

[0063]

As is clear from the above description, according to the network system of the present invention, a plurality of nodes storing at least a platform-dependent program part and a program part described by an intermediate code independent of each other are connected. When the version information of its own network protocol software is older than the version information of the network protocol software of the adjacent node, each node receives the program portion described by the intermediate code from the adjacent node and receives its network protocol. By updating the software, it is possible to upgrade the protocol software without worrying about compatibility, and it is possible to upgrade the version without depending on hardware on the network.

According to the data transmission / reception method and apparatus of the present invention, the network protocol software having at least the platform-dependent program part and the program part described by the intermediate code independent of the network protocol software is stored. When the version information of its own network protocol software is older than the version information, it receives the program part described by the intermediate code from the adjacent node and updates its own network protocol software, so that the protocol can be updated without concern for compatibility. The software can be upgraded, and the version can be upgraded without depending on the hardware on the network.

According to the data transmission / reception method and apparatus of the present invention, network protocol software having at least a platform-dependent program part and a program part described by an intermediate code independent of the network protocol is stored, and the network protocol of an adjacent node is stored. When the version information of the network protocol software is newer than the version information of the software, the version of the protocol software is transmitted without concern for compatibility by transmitting the program part described by the intermediate code to the adjacent node. It is possible to upgrade the version without depending on the hardware on the network.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a system configuration as an embodiment of a network system, a signal transmission / reception method, and a device according to the present invention.

FIG. 2 is a diagram showing a software configuration of a signaling protocol adopted in the present embodiment.

FIG. 3 is a flowchart showing a flow from checking a version between adjacent nodes to upgrading an old version to a new version and restarting in the network system according to the present embodiment.

FIG. 4 is a diagram showing another software configuration of the signaling protocol adopted in the present embodiment.

FIG. 5 is a diagram showing an example of a format of an ATM cell header.

FIG. 6 is a diagram showing a basic reference model of OSI.

FIG. 7 is a diagram showing a configuration of a packet in which an ATM cell header is added to an IP datagram.

FIG. 8 is a diagram illustrating an example of a format of a 1394 synchronization header.

FIG. 9 is a diagram illustrating an example of a format of a 1394 asynchronous header.

FIG. 10 is a diagram showing a configuration of a packet in which a 1394 synchronous header or a 1394 asynchronous header is added to an IP datagram.

[Explanation of symbols]

1 digital video camera, 2, 3, 4, 5 host computer, 6 ATM switch, 7 IEEE
1394 network interface card,
8,9,10,11 ATM network interface card

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04L 13/00 305B

Claims (6)

[Claims] 1. A network which reserves network resources for data transmission / reception and performs data transmission / reception after securing the network resources to perform transfer speed guarantee and non-delayed transfer, and to transfer version information between adjacent nodes. A network system using a protocol, comprising connecting a plurality of nodes storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code independent of the platform, Each node compares the version information of the network protocol software of the adjacent node with the version information of its own network protocol software, and when its own version information indicates an old version, Receives a program portion described by the intermediate code in the network protocol software from an adjacent node, interprets the program portion described by the received intermediate code, and converts the network protocol software indicating the old version of the network protocol software A network system characterized by updating. 2. Each of the nodes compares the version information of the network protocol software of the adjacent node with the version information of the network protocol software of the own node. 2. The network system according to claim 1, wherein a program portion described by the intermediate code in its own network protocol software is transmitted. 3. A network that reserves network resources for data transmission / reception and performs data transmission / reception after securing the network resources, thereby ensuring transfer speed and non-delayed transfer and transferring version information between adjacent nodes. A method for transmitting and receiving data in a network system using a protocol, comprising: storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code that is independent of the platform; The version information of the protocol software is compared with the version information of its own network protocol software. Receiving the program part described by the intermediate code in the work protocol software, interpreting the program part described by the received intermediate code, and updating the network protocol software indicating the previous version of the self. Characteristic data transmission / reception method. 4. A network that reserves network resources for data transmission and reception and performs data transmission and reception after securing the network resources, thereby guaranteeing a transfer speed and performing no-delay transfer, and transferring version information between adjacent nodes. A data transmission / reception device for a network system using a protocol, comprising: software storage means for storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code independent of the platform; Transmitting and receiving means for transmitting and receiving data via a network, and software executing means for executing the network protocol software, wherein the software executing means includes a network for an adjacent node. Comparing the version information of the protocol software with the version information of its own network protocol software, and when the version information of its own indicates an old version, the program described by the intermediate code in the network protocol software of the adjacent node A data transmission / reception device which receives a part via the transmission / reception means, interprets the program part described by the received intermediate code, and updates the network protocol software indicating the old version of the data transmission / reception apparatus. 5. A network which reserves network resources for data transmission / reception and performs data transmission / reception after securing the network resources, thereby guaranteeing a transfer speed and performing no-delay transfer and transferring version information between adjacent nodes. A method for transmitting and receiving data in a network system using a protocol, comprising: storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code that is independent of the platform; The version information of the protocol software is compared with the version information of the network protocol software. When the version information indicates a new version, the version information of the network A data transmission / reception method, comprising transmitting a program portion described by the intermediate code in network protocol software. 6. A network that reserves network resources for data transmission / reception and performs data transmission / reception after securing the network resources to perform transfer speed guarantee and non-delayed transfer and to transfer version information between adjacent nodes. A data transmission / reception device for a network system using a protocol, comprising: software storage means for storing network protocol software having at least a platform-dependent program part and a program part described by an intermediate code independent of the platform; Transmitting and receiving means for transmitting and receiving data via a network, and software executing means for executing the network protocol software, wherein the software executing means includes a network for an adjacent node. Compare the version information of the protocol software with the version information of the network protocol software of the own, and when the version information of the own indicates a new version, describe to the adjacent node by the intermediate code in the own network protocol software. A data transmission / reception device for controlling transmission of a program portion to be transmitted from the transmission / reception means.