JP2004104666A - Packet conversion apparatus and packet conversion method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To convert a packet of a 1st protocol which divides the transmission band of a 1st priority packet and a 1st non-priority packet in time unit into a packet of a 2nd protocol which displays a priority degree in a transmission packet header and transmits a 2nd priority packet and a 2nd non-priority packet. <P>SOLUTION: Data belonging to the 1st priority packet are assigned to the 2nd priority packet, data belonging to the 1st non-priority packet are assigned to the 2nd non-priority packet, and the transmission packet header of the 2nd priority packet indicates higher priority than the transmission packet header of the 2nd non-priority packet. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a first protocol packet that divides a transmission band of a first priority packet and a first non-priority packet in units of time, a priority of a transmission packet header, a second priority packet, and a second priority packet. The present invention relates to a packet conversion device and a packet conversion method for mutually converting a packet of a second protocol for transmitting a second non-priority packet.
[0002]
For example, image and audio sources (cameras and the like)-first protocol (IEEE1394)-protocol conversion means (gateway, set-top box, PC) including the present application-second protocol (IP: Internet Protocol)-network- The present invention is implemented by being connected like a network terminal (PC, IP television, image such as DVD to which IP connection is possible, audio recording device), and provides a packet conversion device and a packet conversion method of the above-described protocol conversion means. is there.
[0003]
[Prior art]
IEEE 1394 is a protocol for transmitting real-time data such as video and audio (hereinafter, referred to as real-time data) using a network. IEEE 1394 guarantees real-time performance by dividing a transmission band in units of time and transmitting real-time data preferentially. The method of dividing the transmission band in units of time can reliably guarantee real-time performance.
[0004]
However, in order to divide the transmission band in units of time as in IEEE 1394, it is necessary to synchronize the time of all terminals connected to the network, so that it can be realized only in a relatively small network. Therefore, for example, in order to transmit real-time data on a worldwide scale, it is necessary to convert the data into a protocol corresponding to a wide area other than IEEE1394 and transmit the data.
[0005]
Japanese Patent Application Laid-Open No. 2000-59399 (hereinafter referred to as Reference 1) is a technique for performing a protocol conversion with IEEE 1394 using an ATM (Asynchronous Transfer Mode) as a protocol corresponding to a wide area.
[0006]
ATM is a protocol that performs transmission in packet units called ATM cells and reserves network bandwidth in advance to guarantee transmission quality.
[0007]
[Patent Document 1]
JP-A-2000-59399 (pages 5 to 14, FIG. 5)
[0008]
[Problems to be solved by the invention]
However, the above conventional method has the following problems.
[0009]
In order to guarantee real-time performance from the IEEE 1394 by using the ATM bandwidth reservation mechanism, an environment that allows the ATM to be directly used as an access line is required. However, since the usage fee of ATM is very high, only a limited number of users such as companies can use such a method.
[0010]
When the ATM reserves a band for each path, the ATM must always reserve the band for the communication device associated with the path. Therefore, even when there is no transmission packet on the path, a transmission band cannot be allocated to another path, and there is a problem that the band is wasted.
[0011]
In response to the above problems, communication services using the Internet protocol (generally simply referred to as the "Internet") use general telephone lines, wireless access, or ADSL (Asymmetric Digital Subscriber Line). It is easily available from home. Furthermore, in recent years, implementation of a mechanism for guaranteeing communication quality for devices used for communication using the Internet protocol has been advanced. As a result, priority processing of the packet is displayed in the transmission header of a packet (hereinafter, referred to as an IP packet) used on the Internet, and a service that guarantees communication quality can be used.
[0012]
Also, since the communication quality assurance mechanism of the communication device used in the Internet Protocol is a method of processing packets with high processing priority in packet units, if there are no packets with high processing priority, other packets will be processed. Bandwidth can be effectively allocated to packets.
[0013]
Reference 1, as described in paragraphs “0003” and “0004”, does not disclose a protocol conversion method for real-time transmission using the Internet.
[0014]
The present invention has been made in view of such a situation, and realizes wide-area communication that guarantees real-time performance by performing packet conversion from IEEE 1394 using an Internet protocol. The application range is not limited to the above protocol, and the first protocol packet that divides the transmission band of the first priority packet and the first non-priority packet in units of time, and the priority is displayed in the transmission packet header to indicate the priority. Provided is a packet conversion device and a packet conversion method for mutually converting between a second protocol packet transmitting a second priority packet and a second non-priority packet to enable real-time transmission even in wide area communication. is there.
[0015]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the first invention of the present application, a packet of a first protocol that divides a transmission band of a first priority packet and a first non-priority packet in units of time is assigned a priority in a transmission packet header. And a second protocol packet for transmitting a second priority packet and a second non-priority packet to a second protocol packet, wherein the first protocol transmission / reception device receives the first protocol packet. Means, a priority data buffer for storing data of a priority packet, a non-priority data buffer for storing data of a non-priority packet, a second protocol transmitting / receiving means for transmitting a packet of the second protocol, The first priority packet input from the protocol transmission / reception means is temporarily stored in the priority data buffer and stored in the second priority packet. And the first non-priority packet is temporarily stored in the non-priority data buffer and converted into the second non-priority packet, and the converted second priority packet and the second Packet conversion control means for transferring a non-priority packet to the second protocol transmission / reception means, wherein the second protocol transmission means transmits the transmission packet header of the second priority packet to the second non-priority packet. The transmission priority is displayed with a higher processing priority in the network than the transmission packet header.
[0016]
More preferably, the first protocol is IEEE1394.
[0017]
More preferably, said second protocol is an Internet protocol.
[0018]
More preferably, the transmission packet header is a TOS field of an IPv4 header.
[0019]
More preferably, the transmission packet header is a traffic class of an IPv6 header.
[0020]
More preferably, the transmission packet header is a flow label of an IPv6 header.
[0021]
Also, the first protocol packet that divides the transmission band of the first priority packet and the first non-priority packet in units of time, the priority is displayed in the transmission packet header, the second priority packet and the second A packet conversion method for converting a non-priority packet to a packet of a second protocol for transmitting the non-priority packet, wherein data belonging to the first priority packet is assigned to the second priority packet, and the packet belongs to the first non-priority packet. Assigning data to the second non-priority packet, and displaying the transmission packet header of the second priority packet with a higher processing priority in the network than the transmission packet header of the second non-priority packet. Features.
[0022]
More preferably, the first protocol is IEEE1394.
[0023]
More preferably, said second protocol is an Internet protocol.
[0024]
More preferably, the transmission packet header is a TOS field of an IPv4 header.
[0025]
More preferably, the transmission packet header is a traffic class of an IPv6 header.
[0026]
More preferably, the transmission packet header is a flow label of an IPv6 header.
[0027]
The second invention of the present application discloses a second protocol packet that divides the transmission band of the second priority packet and the second non-priority packet in units of time, displays the priority in the transmission packet header, and displays the first priority. A packet conversion device for converting a packet and a first non-priority packet to a packet of a first protocol for transmitting the packet of the second protocol, wherein the second protocol transmitting and receiving means for receiving the packet of the second protocol, data of the priority packet A priority data buffer for storing, a non-priority data buffer for storing data of a non-priority packet, a first protocol transmission / reception unit for transmitting the packet of the first protocol, and an input from the second protocol transmission / reception unit. While the second priority packet is temporarily stored in the priority data buffer and converted into the first priority packet, The second non-priority packet is temporarily stored in the non-priority data buffer and converted into the first non-priority packet, and the converted first priority packet and the first non-priority packet are converted into the first protocol. Packet conversion control means for transferring the packet to the transmission / reception means, wherein the packet conversion control means determines the second priority packet and the second non-priority packet using the priority of the transmission packet header.
[0028]
More preferably, the first protocol is IEEE1394.
[0029]
More preferably, said second protocol is an Internet protocol.
[0030]
More preferably, the transmission packet header is a TOS field of an IPv4 header.
[0031]
More preferably, the transmission packet header is a traffic class of an IPv6 header.
[0032]
More preferably, the transmission packet header is a flow label of an IPv6 header.
[0033]
In addition, the priority of the transmission packet header is displayed, and the packet of the second protocol for transmitting the second priority packet and the second non-priority packet is divided into the transmission bandwidth of the first priority packet and the first non-priority packet. A packet conversion method for converting a packet into a first protocol packet that divides data into time units, wherein data belonging to the second priority packet is assigned to the first priority packet and belongs to the second non-priority packet. Assigning data to the first non-priority packet, and determining the second priority packet and the second non-priority packet using the priority of the transmission packet header.
More preferably, the first protocol is IEEE1394.
[0034]
More preferably, said second protocol is an Internet protocol.
[0035]
More preferably, the transmission packet header is a TOS field of an IPv4 header.
[0036]
More preferably, the transmission packet header is a traffic class of an IPv6 header.
[0037]
More preferably, the transmission packet header is a flow label of an IPv6 header.
[0038]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing the configuration of the first invention and the second invention of the present application.
[0039]
In FIG. 1, reference numeral 100 denotes a first protocol network that divides a transmission band of a first priority packet and a first non-priority packet in units of time. In the present embodiment, IEEE 1394 is taken as an example.
[0040]
Reference numeral 101 denotes a second protocol network for displaying a priority in a transmission packet header and transmitting a second priority packet and a second non-priority packet. In the present embodiment, a network using the Internet protocol is taken as an example (hereinafter, referred to as an IP network).
[0041]
Reference numeral 102 denotes a transmission / reception unit of the first protocol. Reference numeral 103 denotes a priority data buffer for temporarily storing priority data stored in the priority packet. Here, the priority data is data stored in the payload of the first priority packet or the second priority packet. In the present embodiment, priority data is data having real-time properties such as video and audio.
[0042]
A non-priority data buffer 104 temporarily stores the non-priority data stored in the non-priority packet. Here, the non-priority data is data stored in the payload of the first non-priority packet or the second non-priority packet. Examples of the non-priority data include control data.
[0043]
105 is a transmission / reception means of the second protocol. Reference numeral 106 denotes a packet conversion control unit that controls packet conversion of a packet of the first protocol and a packet of the second protocol.
[0044]
(Embodiment 1)
In the present embodiment, a method of converting a packet of the first protocol into a packet of the second protocol will be described.
[0045]
In FIG. 1, a packet of a first protocol (a first priority packet or a first non-priority packet) input from an IEEE 1394 network 100 (a first protocol) is transmitted to a first The receiving process of the protocol packet is performed, and the packet is transferred to the packet conversion control unit 106. The packet conversion control means 106 determines whether the received packet is a priority packet or a non-priority packet, temporarily stores the first priority packet in the priority data buffer 103, and deactivates the first non-priority packet. It is temporarily stored in the priority packet priority data buffer 04.
[0046]
Here, the priority packet in the IEEE 1394 network 100 is an isochronous packet, and the non-priority packet is an asynchronous packet. The isochronous packet and the asynchronous packet are band-divided in units of time using a reference signal of 125 microseconds (125 uS). The method of band division in IEEE 1394 is widely known to those skilled in the art, and the method of determining whether a received packet is an isochronous packet or an asynchronous packet is also well known to those skilled in the art.
[0047]
Further, the packet conversion control means 106 performs the following two operations. The priority data is read from the priority data buffer 103 to form the payload of the second priority packet, and is transferred to the second protocol transmitting / receiving means 105. Further, the non-priority data is read from the non-priority data buffer 104 to form the payload of the second non-priority packet, and is transferred to the second protocol transmitting / receiving means 105. At this time, information indicating whether the packet transferred from the packet conversion control means 106 to the second protocol transmitting / receiving means 105 is a priority packet or a non-priority packet is transmitted.
[0048]
The second protocol transmitting / receiving means 105 generates a transmission packet header and adds it to the packet so that the second priority packet is processed with higher priority than the second non-priority packet in the network 101 of the second protocol. Then, the packet is transmitted to the IP network 101.
[0049]
That is, the important point of the first invention of the present application is that when a priority packet of the first protocol is converted into a priority packet of the second protocol, the priority packet of the second protocol passes through the transmission header of the priority packet of the second protocol via the network path. This is to display the message so that it is processed preferentially by the device.
[0050]
Hereinafter, a method of converting an IEEE 1394 packet into an IP packet will be described in detail with reference to the drawings.
[0051]
FIG. 2 is a schematic diagram of a method for converting a packet of the first protocol into a packet of the second protocol.
[0052]
In FIG. 2, reference numeral 200 is a schematic diagram of an IEEE 1394 packet. In IEEE 1394, a time axis (indicated by T in FIG. 2) is divided every 125 uS as indicated by an upward arrow 200. In each divided time zone, an isochronous packet (indicated by I in 200) is preferentially transmitted as a priority packet, and an asynchronous packet (indicated by A in 200) is transmitted as a non-priority packet. That is, the isochronous packet is the first priority packet, and the asynchronous packet is the first non-priority packet. The priority packet stores real-time data, and the non-priority packet stores data that does not require real-time performance. This IEEE 1394 transmission method is widely known to those skilled in the art.
[0053]
201 is a schematic diagram of an IP packet. An IEEE 1394 priority packet is transmitted as a second priority packet with a header H1 added (priority data is indicated by P), and a non-priority packet is transmitted as a second non-priority packet with a header H2 added (non-priority packet). Data is indicated by N).
[0054]
Next, a mechanism regarding priority processing of a protocol in the Internet protocol will be described for each of IPv4 and IPv6.
[0055]
FIG. 3 is a schematic diagram of an IPv4 packet. 3, reference numeral 300 denotes an IPv4 packet, 301 denotes an IPv4 header, and 302 denotes an IPv4 payload. Reference numeral 303 denotes a TOS field of the second byte from the top in the IPv4 header 301 (shown in black in 301). The TOS field indicates the priority of packet processing and the required communication quality, and its use is disclosed in IEEE791. The display of the priority of the packet processing will be described below.
[0056]
In the TOS field, 3 bits from 0 to 2 bits indicate the priority (PRECEDENCE) of packet processing. In this priority display, the higher the value, the higher the priority. Since the display of a considerably high priority is used by a network administrator or used for military purposes, the priority processing of displaying 001 and the routine processing of displaying 000 ( The distinction between normal processing) is sufficient.
[0057]
The three bits (D) of the TOS field specify processing relating to delay, where 0 performs processing with normal delay and 1 performs processing with low delay.
[0058]
As for 4 bits (T) of the TOS field, 0 gives a normal throughput path and 1 gives a high throughput path.
[0059]
The 5 bits (R) of the TOS field are 0 for a normal reliable path and 1 for a high reliable path.
[0060]
As an example of the transmission header (IP header) of the second priority packet and the second non-priority packet, in the priority packet, PRECEDENCE is 001, D is 1 with low delay, T is 1 with high throughput, and R is high reliability. Show gender 1. On the other hand, for non-priority packets, PRECEDENCE indicates 000, D indicates normal delay 0, T indicates normal throughput 0, and R indicates normal reliability 0.
[0061]
In the IP network 101, the routing processing of the IP packet is repeated by a router which is a device constituting the network, and the IP packet is delivered to the final destination of the packet. At that time, the router detects the display of the IPv4 header 301 and processes the priority packet with higher priority than the non-priority packet, so that the priority packet is delivered with higher priority than the non-priority packet. The real-time property of the packet is guaranteed.
[0062]
Next, a case where IPv6 is used for the IP network 101 will be described. FIG. 4 is a schematic diagram of an IPv6 packet.
[0063]
In FIG. 4, 400 indicates an IPv6 packet, 401 indicates an IPv6 header, and 402 indicates an IPv6 payload. Reference numeral 403 denotes the configuration of the first four bytes in the IPv6 header 401 (shown in black in 401).
[0064]
At 403, a flow label is used for processing real-time data traffic.
[0065]
One flow is assigned the same flow label from the start to the end of transmission. If it is desired to transmit real-time data, a setting is made so that a packet to which a flow label used by the IPv6 packet storing the real-time data is added is preferentially processed by the router. As a method of setting the processing priority in the router, for example, Resource Reservation Protocol (RSVP) is widely known to those skilled in the art. RSVP is set in a router that passes by the final destination address of a packet so that a packet to which a specific flow label is added is preferentially processed. As a result, the priority packet is processed with higher priority than the non-priority packet, so that real-time performance can be guaranteed.
[0066]
Note that the above-mentioned RSVP is widely known to those skilled in the art as the protocol for instructing the priority process, but the present invention is not limited to this, and DiffServ, MPLS (Multiprotocol Label Switching), or other protocols and techniques may be used.
[0067]
At 403, the traffic class (Traffic Class) is equivalent to the function of the TOS field of IPv4, although the relationship with the processing in the router is not clearly defined at this time. Can be classified. The present invention can be implemented even if a traffic class is used to distinguish the priority of processing of an IP packet, and is not excluded from the scope of the present invention.
[0068]
It is needless to say that the process of adding the IPv4 and IPv6 headers in the second protocol transmitting / receiving means is a process of adding a fixed header and is performed by a simple circuit.
[0069]
In this embodiment shown in FIG. 2, the first priority packet in IEEE1394 is made to correspond to the second priority packet on a one-to-one basis, and the first non-priority packet is similarly converted to the second non-priority packet. Although an example in which one-to-one correspondence is shown is shown, the invention is not limited to this. For example, a plurality of packets of the first protocol may be combined and correspond to one packet of the second protocol. Further, the packet of the first protocol may be divided into a plurality of packets of the second protocol. These cases can be realized by slightly changing the process of reading from the priority data buffer 103 and the non-priority data buffer 104 of the packet conversion control means 106.
[0070]
As described above, according to the first invention of the present application, the packet of the first protocol that divides the transmission band of the first priority packet and the first non-priority packet in units of time has priority over the transmission packet header. Even if the degree is displayed and the second priority packet and the second non-priority packet are converted into packets of the second protocol for transmission, high-quality transmission that guarantees real-time performance becomes possible.
[0071]
In addition, it becomes possible to use the Internet protocol, and real-time transmission of data that has been transmitted in real time through a local network can be performed in a wide area.
[0072]
(Embodiment 2)
In the present embodiment, a method of converting a packet of the second protocol into a packet of the first protocol will be described.
[0073]
In FIG. 1, a packet of a second protocol (a second priority packet or a second non-priority packet) input from an IP network 101 (a second protocol) is transmitted to a second A packet of the protocol is received and transferred to the packet conversion control means 106. At this time, the second protocol transmission / reception unit 105 checks the transmission header of the received IP packet and notifies the packet conversion control unit 106 of whether the packet is a priority packet or a non-priority packet. The field indicating the processing priority of the transmission header used in the priority packet and the non-priority packet may be determined in advance between the transmitting and receiving terminals, or may be determined by negotiation between the transmitting and receiving terminals prior to transmission and reception.
[0074]
The packet conversion control means 106 temporarily stores the second priority packet in the priority data buffer 103 and temporarily stores the second non-priority packet in the non-priority packet priority data buffer 104.
[0075]
Further, the packet conversion control means 106 performs the following two operations. At the transmission time of the IEEE 1394 isochronous packet, which is the first protocol, priority data is read from the priority data buffer 103 to form a payload of the isochronous packet, and is transferred to the second protocol transmitting / receiving means 105. Further, the non-priority data is read from the non-priority data buffer 103 at the transmission time of the asynchronous packet to form a payload of the asynchronous packet, and is transferred to the second protocol transmitting / receiving means 105. At this time, the first protocol transmitting / receiving means receives the reference signal of 125 uS from the IEEE 1394 network 100, and controls the transmission timing by notifying the packet conversion control means 106 of the transmission time of the isochronous packet and the transmission time of the asynchronous packet.
[0076]
The first protocol transmission / reception unit 105 performs transmission processing on the IEEE 1394 network 100 and transmits a packet to the IEEE 1394 network 100.
[0077]
That is, the important point of the second invention of the present application is that the transmission header is inspected at the time of receiving the packet of the second protocol, and the priority data stored in the received second priority packet is replaced with the priority packet of the first protocol. And converting the non-priority data stored in the received second non-priority packet into a non-priority packet of the first protocol.
[0078]
FIG. 5 is a schematic diagram of a method of converting a packet of the second protocol into a packet of the first protocol. 500 is a schematic diagram of an IP packet. The priority packet of the second protocol has a header H1 added thereto, and the non-priority packet of the second protocol has a header H2 added thereto and is received by the second protocol transmitting / receiving means 105 as an IP packet which is a packet of the second protocol. You.
[0079]
The second protocol transmitting / receiving means 105 examines the transmission headers H1 and H2 to determine a priority packet of the second protocol and a non-priority packet of the second protocol. The display of the priority packet and the non-priority packet of the transmission packet header uses the method described in Embodiment 1 with reference to FIGS.
[0080]
The data of the priority packet of the second protocol (indicated by P in FIG. 5) is finally converted into an isochronous packet of I in 501 via the priority data buffer 103, and the non-priority packet of the second protocol is The data (indicated by N in FIG. 5) is finally converted into an asynchronous packet indicated by 501A through the non-priority data buffer 104.
[0081]
In the present embodiment shown in FIG. 5, the priority packet of the IP packet is made to correspond one-to-one to the IEEE 1394 priority packet, and similarly, the IP packet non-priority packet is made to correspond one-to-one to the IEEE 1394 non-priority packet. Although an example is shown, it is not limited to this. For example, a plurality of IP packets may be collectively associated with one IEEE 1394 packet. Further, an IP packet may be divided so as to correspond to a plurality of IEEE 1394 packets. In this case, it can be realized by slightly changing the reading process from the priority data buffer 103 and the non-priority data buffer 104 of the packet conversion control means 106.
[0082]
As described above, according to the second invention of the present application, the packet of the second protocol that divides the transmission band of the second priority packet and the second non-priority packet in units of time is assigned a priority in the transmission packet header. Is displayed and the first priority packet and the first non-priority packet are converted into packets of the first protocol to be transmitted, and high-quality transmission with real-time property guaranteed.
[0083]
In addition, it becomes possible to use the Internet protocol, so that data transmitted in real time from a wide area network can be transmitted in a local network while ensuring real time performance.
[0084]
In the present invention, the second protocol indicates the priority in the transmission packet header, but this priority is not only the priority of packet processing in the device through which the packet passes, but also the packet delay, the reliability of the packet, It also includes the meaning of packet communication quality such as packet throughput.
[0085]
【The invention's effect】
According to the first invention of the present application, the first protocol packet that divides the transmission band of the first priority packet and the first non-priority packet in units of time, the priority is displayed in the transmission packet header, and the second protocol is displayed. Even if the priority packet and the second non-priority packet are converted into packets of the second protocol for transmission, high-quality transmission that guarantees real-time performance can be performed.
[0086]
According to the second invention of the present application, the packet of the second protocol that divides the transmission band of the second priority packet and the second non-priority packet in units of time, the priority is displayed in the transmission packet header, and the first Even if the priority packet and the first non-priority packet are converted into packets of the first protocol for transmission, high-quality transmission with real-time property guaranteed.
[0087]
In the first and second aspects of the present invention, the use of the Internet protocol enables seamless real-time transmission to be guaranteed between the local network and the wide area network.
[0088]
In addition, since priority control is performed on a packet basis in a wide area network, wasteful use of a band, which is a problem in a band reservation system such as an ATM, does not occur, and transmission using a band effectively can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a first and a second embodiment of the present application.
FIG. 2 is a schematic diagram of a method for converting a packet of a first protocol into a packet of a second protocol.
FIG. 3 is a schematic diagram of an IPv4 packet.
FIG. 4 is a schematic diagram of an IPv6 packet.
FIG. 5 is a schematic diagram of a method for converting a packet of the second protocol into a packet of the first protocol.
[Explanation of symbols]
100 First Protocol Network
101 Second protocol network
102 First protocol transmitting / receiving means
103 Priority data buffer
104 Non-priority data buffer
105 Second protocol transmitting / receiving means
106 packet conversion control means

Claims (24)

The first protocol packet that divides the transmission band of the first priority packet and the first non-priority packet in units of time, displays the priority in the transmission packet header and displays the second priority packet and the second non-priority packet. A packet conversion device for converting a packet into a packet of a second protocol for transmitting the packet, a first protocol transmitting and receiving means for receiving the packet of the first protocol, a priority data buffer for storing data of the priority packet, A non-priority data buffer for storing data of the non-priority packet, a second protocol transmission / reception means for transmitting the packet of the second protocol, and the first priority packet input from the first protocol transmission / reception means. While being temporarily stored in the priority data buffer and converted to the second priority packet, the first non-priority packet is also converted. Is temporarily stored in the non-priority data buffer and converted into the second non-priority packet, and the converted second priority packet and the second non-priority packet are transferred to the second protocol transmitting / receiving means. Packet conversion control means, wherein the second protocol transmission means sets the transmission packet header of the second priority packet to a processing priority in the network more than the transmission packet header of the second non-priority packet. A packet conversion device that displays high and transmits. 2. The packet conversion device according to claim 1, wherein the first protocol is IEEE1394. The packet conversion device according to claim 1, wherein the second protocol is an Internet protocol. The packet conversion device according to claim 1, wherein the transmission packet header is a TOS field of an IPv4 header. The packet converter according to claim 1, wherein the transmission packet header is a traffic class of an IPv6 header. The packet conversion device according to claim 1, wherein the transmission packet header is a flow label of an IPv6 header. The first protocol packet that divides the transmission band of the first priority packet and the first non-priority packet in units of time, displays the priority in the transmission packet header and displays the second priority packet and the second non-priority packet. A packet conversion method for converting a packet into a packet of a second protocol for transmitting a packet, wherein data belonging to the first priority packet is assigned to the second priority packet, and data belonging to the first non-priority packet is assigned. Allocating to the second non-priority packet, displaying the transmission packet header of the second priority packet at a higher processing priority in the network than the transmission packet header of the second non-priority packet. Packet conversion method to use. The packet conversion device according to claim 7, wherein the first protocol is IEEE1394. The packet conversion device according to claim 7, wherein the second protocol is an Internet protocol. The packet converter according to claim 7, wherein the transmission packet header is a TOS field of an IPv4 header. The packet converter according to claim 7, wherein the transmission packet header is a traffic class of an IPv6 header. The packet conversion device according to claim 7, wherein the transmission packet header is a flow label of an IPv6 header. The packet of the second protocol that divides the transmission bandwidth of the second priority packet and the second non-priority packet in units of time, displays the priority in the transmission packet header, and displays the first priority packet and the first non-priority packet. A packet conversion device for converting a packet into a first protocol packet that transmits a packet, a second protocol transmitting / receiving unit that receives the second protocol packet, and a priority data buffer that stores data of the priority packet, A non-priority data buffer for storing data of a non-priority packet, a first protocol transmission / reception unit for transmitting the packet of the first protocol, and the second priority packet input from the second protocol transmission / reception unit. While temporarily storing the data in the priority data buffer and converting it to the first priority packet, the second non-priority packet is Is temporarily stored in the non-priority data buffer and converted into the first non-priority packet, and the converted first priority packet and the first non-priority packet are transferred to the first protocol transmitting / receiving means. A packet conversion device, comprising: a packet conversion control unit, wherein the packet conversion control unit determines the second priority packet and the second non-priority packet using a priority of the transmission packet header. 14. The packet converter according to claim 13, wherein the first protocol is IEEE1394. 14. The packet conversion device according to claim 13, wherein the second protocol is an Internet protocol. 14. The packet conversion device according to claim 13, wherein the transmission packet header is a TOS field of an IPv4 header. 14. The packet converter according to claim 13, wherein the transmission packet header is a traffic class of an IPv6 header. 14. The packet conversion device according to claim 13, wherein the transmission packet header is a flow label of an IPv6 header. The priority of the transmission packet header is displayed and the second protocol packet for transmitting the second priority packet and the second non-priority packet is displayed, and the transmission bandwidth of the first priority packet and the first non-priority packet is displayed. A packet conversion method for converting into packets of a first protocol that is divided in units, wherein data belonging to the second priority packet is assigned to the first priority packet, and data belonging to the second non-priority packet is A packet conversion method, wherein the packet is assigned to the first non-priority packet, and the second priority packet and the second non-priority packet are determined using the priority of the transmission packet header. The packet conversion device according to claim 19, wherein the first protocol is IEEE1394. The packet conversion device according to claim 19, wherein the second protocol is an Internet protocol. 20. The packet converter according to claim 19, wherein the transmission packet header is a TOS field of an IPv4 header. 20. The packet converter according to claim 19, wherein the transmission packet header is a traffic class of an IPv6 header. The packet conversion device according to claim 19, wherein the transmission packet header is a flow label of an IPv6 header.

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