WO2003003692A1 - Procede de transmission de paquets, relais et terminal - Google Patents

Procede de transmission de paquets, relais et terminal Download PDF

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Publication number
WO2003003692A1
WO2003003692A1 PCT/JP2002/005471 JP0205471W WO03003692A1 WO 2003003692 A1 WO2003003692 A1 WO 2003003692A1 JP 0205471 W JP0205471 W JP 0205471W WO 03003692 A1 WO03003692 A1 WO 03003692A1
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WO
WIPO (PCT)
Prior art keywords
transmission
transmission medium
packet
protocol
transmission protocol
Prior art date
Application number
PCT/JP2002/005471
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English (en)
Japanese (ja)
Inventor
Nobuhiro Tsubone
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Publication of WO2003003692A1 publication Critical patent/WO2003003692A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols

Definitions

  • the present invention relates to a packet transfer method, a relay device, and a terminal device for realizing QoS control of a communication service deployed on a communication network.
  • the connection between the relay device and the relay device or between the relay device and the terminal device is performed by using a wired transmission medium such as coaxial cable, twisted pair wire, or optical fiber, mobile communication, satellite communication, FWA ( Transmission media arbitrarily selected from wireless transmission media such as Fixed Wireless Access) shall be used.
  • a wired transmission medium such as coaxial cable, twisted pair wire, or optical fiber
  • mobile communication satellite communication
  • FWA Transmission media arbitrarily selected from wireless transmission media such as Fixed Wireless Access
  • Q0S Quality of Service
  • the local QoS control refers to an operation of changing the QoS toward a certain target value when each relay device or each terminal device constituting the communication network performs a bucket transfer.
  • Communication services refer to applications such as file transfer, e-mail, IP telephone, video distribution, Web access, and network management that are realized between specific terminal devices.
  • the QoS of the communication service indicates QOS between specific terminal devices that realize the communication service.
  • QoS control of communication service is a combination of local QoS control at various places between specific terminals that implement communication service, and changes the QoS of communication service toward a certain target value. The operation to be performed is shown.
  • a communication network that implements the above-described conventional packet transfer method is composed of a relay device, a terminal device, and a transmission medium that connects between the relay devices and between the relay device and the terminal device. Therefore, analyzing the QoS control of a communication service in general, packet transfer that realizes the communication service is affected by all the behaviors of each terminal device, each relay device, and each transmission medium existing on the communication path. Will be. However, in the prior art described in the above publication, in the QoS control of the communication service, only the influence of the behavior by each relay device is considered, that is, only the degree of congestion generated in the packet transfer of each relay device is considered. Consideration is not given to the effect of behavior on each terminal device and each transmission medium.
  • each terminal device can be regarded as a relay device that does not have a packet input line and generates its bucket internally. It can be inferred that they are not directly described.
  • each communication service is realized on a communication path that arbitrarily combines a wired transmission medium and a wireless transmission medium.
  • the wireless transmission medium has a problem that the QoS of physical services at both ends is generally inferior to the wired transmission medium.
  • a wireless transmission medium generally has a higher bit error rate than a wired transmission medium, and thus the physical service at both ends of the transmission medium has a lower reliability in QoS than the wired transmission medium. Therefore, the relay device connected to the wireless transmission medium sets a high transfer priority for a specific type of packet, and reduces the possibility that the specific type of packet is discarded during congestion. Even if control is performed, the possibility that a transmission packet will correctly reach the other relay device connected to the transmission medium is reduced due to a bit error occurring on the transmission medium.
  • the QoS of the communication service will be reduced if the transmission delay exceeds a certain value, even if the packet is reliably transmitted to the repeater on the other side by retransmission. That is, the quality of the call between the terminals is significantly deteriorated. Therefore, packet retransmission in IP telephony does not contribute to the improvement of the QoS of the communication service, generates unnecessary traffic on the transmission medium, and leads to poor utilization efficiency of the transmission medium. Sometimes.
  • the communication service when the communication service is file transfer, packet and packet loss between terminals is not allowed from the viewpoint of QoS control of the communication service. It will contribute to control. Conversely, if the packet is not retransmitted when the packet is lost, retransmission occurs between the terminals using the transport layer protocol, and the retransmission bucket affects communication networks other than the transmission medium. Therefore, the traffic of the communication network is increased, and the utilization efficiency of the entire communication network is degraded.
  • a retransmission function when detecting the loss of a bucket is required to supplement the QoS, but depending on the type of communication service,
  • the retransmission function does not only contribute to the improvement of the QoS of the communication service, but also degrades the efficiency of use of the communication network, and may cause undesirable results as a whole.
  • the present invention provides a communication service including a wireless transmission medium in which the QoS of a physical service is inferior to a wired transmission medium.
  • the purpose of the present invention is to provide a packet transfer method, a relay device, and a terminal device that realize QOS control of a communication service and further achieve the same use efficiency of a communication network as a communication network configured with a wired transmission medium.
  • the bucket transfer method according to the present invention is realized by a relay device constituting a communication network, and is based on, for example, information included in a received packet and information on routing control preset in the relay device.
  • a transmission medium determining step of determining a transmission medium to which the received bucket is to be transferred (corresponding to step S1 of Embodiment 1 described later) and a transfer destination
  • a determination step (equivalent to step S2) for determining whether or not a plurality of transmission protocols can be used in the transmission medium determined as described above. Based on information included in the relay device and information on transmission protocol selection conditions preset in the relay device.
  • a transmission protocol determination step (corresponding to step S3) for determining a transmission protocol to be used in the transmission medium determined as the destination, and a bucket is transferred to the transmission medium determined as the destination according to the determined transmission protocol.
  • a bucket transfer step (corresponding to step S4).
  • the packet transfer method is realized by a terminal device constituting a communication network. For example, based on information on routing control preset in the terminal device, transmission of a transfer destination is performed.
  • a determination step (equivalent to step S2) for determining whether or not a medium can use a plurality of transmission protocols; and a packet generated internally when a plurality of transmission protocols are set to be used.
  • a transmission protocol determining step (corresponding to step S3) for determining a transmission protocol to be used in a transfer destination transmission medium based on information contained therein and information on a transmission protocol selection condition preset in the terminal device. According to the determined transmission protocol, a packet transfer step for transferring the packet to the transmission medium of the transfer destination is performed. Characterized in that it comprises a flop (corresponding to step S 4), a.
  • the transmission medium that can be used as the transfer destination of the reception bucket is set so that a plurality of types of transmission protocols can be used, and the transmission medium determined as the transfer destination is used. If multiple types of transmission protocols are available, the information included in the received bucket or the transmission protocol set in advance A transmission protocol used in the transmission medium is selected based on information on a protocol selection condition.
  • the information relating to the transmission protocol selection condition preset in advance uses a condition relating to an upper layer protocol or a characteristic of an application used in a bucket to be transferred. It is characterized by
  • the relay device when it is determined that the quality of service (QoS) of the communication service at both ends of the transmission medium that can be used as the transfer destination of the reception bucket is not sufficient. Is characterized by selecting a transmission protocol that improves the QoS of the data link service at both ends.
  • a transmission medium that can be used as a transfer destination of the internally generated bucket is set so that a plurality of types of transmission protocols can be used, and the transfer medium of the transfer destination is set.
  • the transmission protocol used for the transmission medium is selected based on the information included in the bucket and the information on the transmission protocol selection conditions set in advance inside. It is characterized by the following.
  • the information relating to the transmission protocol selection condition preset in advance includes the condition relating to the upper layer protocol or the characteristics of the application used for the bucket to be transferred. It is characterized by using.
  • the terminal device when it is determined that the QoS (Quality of Service) of the communication service at both ends of the transmission medium that can be used as the transfer destination of the bucket is not sufficient. Is characterized by selecting a transmission protocol that improves the QoS of the data link service at both ends.
  • FIG. 1 is a communication network according to a first embodiment for realizing the packet transfer method according to the present invention.
  • FIG. 2 is a diagram showing a configuration of a network
  • FIG. 2 is a diagram showing a structure of a packet transferred on a communication network
  • FIG. 3 is a diagram showing a configuration of a relay device 3 or a relay device 4
  • FIG. 4 is a flowchart showing a packet transfer process of a packet transfer unit.
  • FIG. 5 is a diagram showing a configuration of a communication network according to a second embodiment for realizing the packet transfer method according to the present invention.
  • FIG. 6 is a diagram showing a configuration of the terminal device 11. BEST MODE FOR CARRYING OUT THE INVENTION
  • Embodiment 1
  • FIG. 1 is a diagram showing a configuration of a communication network according to a first embodiment for realizing a packet transfer method according to the present invention.
  • reference numerals 1 and 2 denote terminal devices
  • reference numerals 3 and 4 denote relay devices that execute the data transfer method according to the present embodiment
  • reference numeral 5 denotes a wired connection that connects the terminal device 1 and the relay device 3.
  • 6 is a wireless transmission medium for connecting the relay device 3 and the relay device 4
  • 7 is a wired transmission medium for connecting the terminal device 2 and the relay device 4
  • 8 is a terminal device. It represents a communication service realized between 1 and the terminal device 2.
  • the communication network in the present embodiment is controlled based on an Internet standard protocol system defined by the Internet Engineering Task Force (IETF). That is, the protocol of the network layer is based on RFC (Request for Comments) 791 "Internet Protocol", and the protocol of the transport layer is RFC 768 "User Datagram Protocol” or RFC 793 "Transmission Control Protocol”. based on. Therefore, the bucket transferred on the communication network has the structure shown in FIG. 2 when no fragmentation occurs in the network layer. Note that, in this embodiment, in order to briefly explain the main points, only when no fragmentation occurs in the network layer, the present invention is not limited to this. For example, even when this fragmentation occurs, the configuration of the present invention is applied by adding a process of analyzing the information contained in the packet in detail. it can.
  • IETF Internet Engineering Task Force
  • FIG. 3 is a diagram showing a configuration of the relay device 3 or the relay device 4.
  • reference numeral 21 denotes a first transmission protocol control unit for a wired transmission medium
  • 22 denotes a second transmission protocol control unit for a wireless transmission medium
  • 23 denotes a wired transmission medium.
  • a bucket transfer unit that manages a packet transfer to and from a wireless transmission medium.
  • the packet transfer unit 24 determines a transmission medium to which a packet should be transferred at the time of packet transfer, and determines a usable transmission protocol for a transferable transmission medium.
  • a type of routing control information that is used by the communication network operation manager as appropriate for the management of the type, and 25 is used to select a transmission protocol to be used at the bucket transfer destination.
  • the function for implementing the QoS control of the communication service described in the prior art is assumed to be included in the packet transfer unit 23, but is not necessary for the present invention. Its configuration and operation shall not be specified.
  • the wireless transmission medium 6 connected to the relay device 3 and the relay device 4 it is set so that a plurality of transmission protocols can be used.
  • the wired transmission medium 7 is set so that a single transmission protocol can be used. That is, the second transmission protocol control unit 22 in the relay device 3 or the relay device 4 is provided with a function of controlling a plurality of transmission protocols in advance.
  • the multiple transmission protocols refer to the following three types of transmission protocols.
  • a protocol for retransmitting a packet requested to be transmitted from the packet transfer unit 23 to the other party within a preset number of times until arrival confirmation is obtained (until an arrival confirmation packet is received from the relay equipment on the other side).
  • Retransmission control is performed by the data link layer protocol.
  • a protocol for continuously transmitting the bucket requested to be transmitted from the bucket transfer unit 23 for a preset number of times without confirming the arrival is performed by the protocol of the data link layer
  • the above simplified transmission protocol can be said to have the shortest occupancy time of the wireless transmission medium 6 to which the bucket is transferred and the highest utilization efficiency of the transmission medium, but the QoS of the data link service at both ends of the transmission medium Has the lowest reach reliability.
  • the above-mentioned arrival confirmation type transmission protocol has a higher reliability of the QOS of the data link service at both ends of the transmission medium than the simple type transmission protocol, but is accompanied by retransmission when an arrival failure occurs. Transmission delay increases.
  • the reliability of the QoS of the data link service at both ends of the transmission medium is higher than that of the simple transmission protocol, but the bucket is continuously transmitted without confirming the arrival. It has the feature that transmission delay is smaller than the arrival confirmation type transmission protocol.
  • the second transmission protocol controller 22 uses the above three types of transmission protocols in accordance with the QoS of the communication service required for each application realized by the communication service 8 as follows. As a result, QoS control of the communication service is realized, and furthermore, the use efficiency of the entire communication network is prevented from being deteriorated.
  • the simplified transmission protocol is adopted when the QoS of the communication service is not particularly required.
  • the arrival confirmation transmission protocol is adopted when high arrival reliability is required but transmission delay is allowed. Examples of applicable applications include file transfer and network management.
  • the continuous transmission protocol is adopted when high transmission reliability and small transmission delay are required. Applicable application Examples include applications that require real-time control, such as IP phones and video distribution.
  • the destination port number or the source port in the transport layer header in the packet is used. Perform identification by referring to the number.
  • the port number assigned to a typical application is specified in the section “WELL KNOWN P0 RT NUMBERS in R F C 170 0 0“ ASSIGNED NUMBERS ”specified by IETF.
  • RTP A Transport Protocol for Real-Time Applications
  • the application is identified by performing a detailed analysis of the network layer header, transport layer header, and application header (RTP header) in the packet.
  • RTP header application header
  • IPv6 Internet Protocol Version 6
  • the packet transmitted by the terminal device 1 reaches the relay device 3 via the wired transmission medium 5.
  • the first transmission protocol control unit 21 The packet is received by the transmission protocol control function for the transmission medium 5, and then the received bucket is transmitted to the bucket transfer unit 23.
  • FIG. 4 is a flowchart showing a packet transfer process of the packet transfer unit 23 in the relay device 3 (or the relay device 4).
  • the packet transfer unit 23 refers to the network layer header in the received packet and the routing control information storage unit 24 to determine a transmission medium to which the received packet is to be transferred (step S1). Since this terminal device 1 transmits the received packet to the terminal device 2, the wireless transmission medium 6 is determined as the transmission medium to be transferred here.
  • the bucket transfer unit 23 refers again to the routing control information storage unit 24 to determine whether a plurality of transmission protocols can be used in the wireless transmission medium 6 determined as the transfer destination (step S 2).
  • the wireless transmission medium 6 is set so that a plurality of protocols can be used (steps S 2 and Y es), so the packet transfer unit 23 includes the packet in the received packet.
  • the transmission protocol used in the transmission medium 6 of the line is determined (step S3).
  • the transmission protocol selection condition information is information composed of a combination of a filtering condition and a type of a transmission protocol used when the condition is satisfied.
  • some configuration examples of the transmission protocol selection condition information are as follows.
  • the source address in the network layer header of the received packet matches the address of terminal device 1, and the destination port number or source port number in the transport layer header of the received packet is If it is 10, select the continuous transmission type transmission protocol.
  • the configuration of the transmission protocol selection condition information is set in advance by the communication network operation administrator based on the QoS requirements of each communication service and individual requirements from the user. Keep it.
  • the bucket transfer unit 23 After executing the processing in step S3, the bucket transfer unit 23 transmits the packet to the wireless transmission medium 6 using the determined transmission protocol. Request to 2 (step S 4).
  • the packet transmitted from the relay device 3 propagates through the wireless transmission medium 6 and reaches the relay device 4.
  • the relay device 4 performs the transfer process based on the flowchart shown in FIG. 4, as in the case of the relay device 3.
  • the transmission medium of the transfer destination determined in the process of step S1 is the wired transmission medium 7, and since the wired transmission medium 7 can use a single transmission protocol as described above (step S 2, No), the packet transfer unit 23 performs the first transmission protocol control so that the packet is directly transferred to the wired transmission medium 7 without performing the transmission processing determination process (step S 3). Request is made to the control unit 21 (step S4).
  • the packet output from the relay device 4 reaches the terminal device 2 via the wired transmission medium 7.
  • the relay device when a packet is transferred by the relay device, if a plurality of transmission protocols can be used in the transmission medium determined as the transfer destination, the information contained in the bucket and the relay The transmission protocol to be adopted is selected based on the transmission protocol selection information preset in the device. This makes it possible to transfer buckets according to the type of communication service to be used. Therefore, even in a communication network including a wireless transmission medium, QOS control of a communication service similar to that of a communication network configured with a wired transmission medium is realized. Use efficiency of a communication network equivalent to a communication network configured with a transmission medium can be realized.
  • the packet transfer process executed by the relay device has been described.
  • the packet transfer process executed by the terminal device will be described.
  • FIG. 5 is a diagram showing a configuration of a communication network according to a second embodiment for realizing the bucket transfer method according to the present invention.
  • 11 is a terminal device for executing the data transfer method of the present embodiment
  • 12 is a terminal device similar to the terminal device 2 described above
  • 13 is a terminal device for the relay device 3 described above.
  • a relay device similar to the relay device 4 14 is a relay device in which the second transmission protocol control unit 22 in the above-described relay device 3 or relay device 4 is replaced with a first transmission protocol control unit 21;
  • 15 is a wireless transmission medium for connecting the terminal device 11 and the relay device 13
  • 16 is a wired transmission medium for connecting the relay device 13 and the relay device 14
  • 7 denotes a wired transmission medium for connecting the terminal device 12 and the relay device 14
  • reference numeral 18 denotes a communication service realized between the terminal device 11 and the terminal device 12.
  • FIG. 6 is a diagram showing a configuration of the terminal device 11.
  • reference numeral 30 denotes a transmission protocol control unit having a function of controlling a plurality of transmission protocols similar to the second transmission protocol control unit 22 of FIG. 3, and 31 denotes a packet transfer unit of FIG.
  • a bucket transfer unit having the same function as that of the unit 23, 32 is a routing control information storage unit similar to the routing control information storage unit 24 of FIG. 3, and 33 is a transmission protocol of FIG.
  • Selection condition information storage unit 25 is a transmission protocol selection condition and condition information storage unit similar to 25.
  • 34 is a network layer protocol control unit that performs control based on RFC791 "Internet Protocol ⁇ 'etc. specified by the IETF.
  • 35 is RFC 768 "User Datagram Protocol"
  • RFC 793 Transmission Control 1 is a transport layer protocol control unit that performs control based on "Protocol.”
  • 36 is an application control unit that controls various applications such as file transfer, e-mail, IP telephone, video distribution, web access, and network management.
  • a description will be given of a packet transfer method according to the present embodiment in the above communication network
  • the terminal device 11 transmits a packet to the terminal device 12.
  • the packet transfer unit 31 performs the packet transfer process according to the flowchart of Fig. 4 in the same manner as described above, only the operation different from that described above will be described.
  • the packet transfer unit 31 processes a packet generated by one of the application control unit 36, the transport layer protocol control unit 35, and the network layer protocol control unit 34 based on the flowchart shown in FIG. I do. However, in this case, since the only transmission medium connected to the terminal device 11 is the wireless transmission medium 15, the process for determining the transmission medium of the transfer destination (FIG. 4, step S1) is omitted. Is done.
  • the information included in the packet may be used.
  • the transmission protocol to be adopted is selected based on the transmission protocol selection information preset in the relay device. With this, ⁇ ,. Packets can be transferred using a transmission protocol according to the type of communication service to be used. QS control of this communication service is realized, and the usage efficiency of a communication network equivalent to a communication network configured with a wired transmission medium can be realized.
  • Embodiments 1 and 2 describe a data transfer method realized in a communication network including two terminal devices, two relay devices, and three transmission media
  • the present invention is not limited to this.
  • the number of terminal devices, the number of relay devices, and the number of transmission media can be applied to a larger communication network.
  • the transmission protocol to be adopted is selected based on the information included in the above and the transmission protocol selection information preset in the relay device.
  • received packets can be transferred using a transmission protocol according to the type of communication service to be used, so that even a communication network including a wireless transmission medium is configured with a wired transmission medium.
  • This has the effect that QoS control of communication services similar to those of a communication network can be realized.
  • a plurality of transmission protocols when a plurality of transmission protocols can be used in a transmission medium of a transfer destination when a packet generated in a terminal device is transferred, information contained in the packet and a relay device are previously stored.
  • the transmission protocol to be adopted is selected based on the set transmission protocol selection information.
  • packets generated internally can be transferred using a transmission protocol according to the type of communication service to be used, so even a communication network including a wireless transmission medium can be configured using a wired transmission medium.
  • This achieves the effect of realizing QoS control of communication services similar to the communication network used.
  • there is an effect that utilization efficiency of a communication network equivalent to a communication network configured with a wired transmission medium can be realized.
  • the relay device when a plurality of transmission protocols can be used in the transmission medium determined as the transfer destination, information included in the reception bucket and transmission protocol selection information preset in the relay device Based on this, we decided to select the transmission protocol to be used. This has the effect that the relay device can be obtained while the received packet can be transferred by the transmission protocol according to the type of communication service to be used.
  • the packet to be transferred is used as the transmission protocol selection condition information.
  • the conditions related to the characteristics of the upper layer protocol or application used in the application are used.
  • the data link service at both ends is determined.
  • the transmission protocol that improves the QoS was selected. As a result, it is possible to obtain a relay device capable of selectively using a plurality of types of transmission protocols according to the QOS of a communication service required for each application.
  • the transmission protocol to be adopted was selected. As a result, it is possible to obtain a terminal device capable of transferring an internally generated packet using a transmission protocol corresponding to the type of communication service to be used.
  • the transmission protocol selection condition information is configured to use a condition relating to an upper layer protocol or an application characteristic used for a packet to be transferred. This makes it possible to select a transmission protocol according to the type of communication service to be used, thereby realizing QoS control of the communication service and preventing the usage efficiency of the entire communication network from deteriorating. This has the effect that a terminal device can be obtained.
  • the data link at both ends is determined.
  • the transmission protocol that improves the QOS of the service is selected. This allows multiple types of transmission protocols to be used for each key. It is possible to obtain a terminal device that can be used properly according to the QoS of a communication service required for an application. Industrial applicability
  • the packet transfer method, the relay device, and the terminal device according to the present invention are suitable for implementing QoS control of a communication service deployed on a communication network.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Abstract

Lorsqu'une pluralité de protocoles peuvent être utilisés dans un support de transmission considéré comme destination de transmission, un relais (3 ou 4) sélectionne le protocole de transmission à utiliser et se base, pour cette décision, sur la nature de l'information contenue dans le paquet de réception et sur les choix faits pour le protocole de transmission par un processus interne.
PCT/JP2002/005471 2001-06-27 2002-06-04 Procede de transmission de paquets, relais et terminal WO2003003692A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001194244A JP2003008682A (ja) 2001-06-27 2001-06-27 パケット転送方法、中継装置および端末装置
JP2001-194244 2001-06-27

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WO2003003692A1 true WO2003003692A1 (fr) 2003-01-09

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JP4681270B2 (ja) * 2004-10-27 2011-05-11 株式会社日立製作所 車両制御用無線通信システム
JP5167329B2 (ja) * 2010-11-29 2013-03-21 株式会社日立製作所 車両制御用無線通信システム

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JPH10190631A (ja) * 1996-12-27 1998-07-21 Toshiba Corp データ通信方法および装置
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