JP2016225945A - Information transfer method, session control server, edge router, information transfer method, and information transfer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform priority transfer control on the basis of an importance degree of information to an IP network user.SOLUTION: A session control server 10 acquires an importance degree of packets to be transferred from a user terminal which starts a session. An EN1 sets a parameter corresponding to the importance degree acquired by the session control server 10 to a packet as a DSCP value, classifies the packets to classes corresponding to the DSCP value, and transfers the packets, in accordance with a transfer method corresponding to the classes.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an information transfer method, a session control server, an edge router, an information transfer method, and an information transfer program.

  Conventionally, in an IP network using IP (Internet Protocol) as a communication protocol, priority transfer control of IP packets is performed for the purpose of ensuring communication quality (QoS: Quality of Service). In the priority transfer control, for example, in an audio / video flow, when the traffic is concentrated with a low delay that keeps the transfer delay within an allowable range for packet transfer within the same flow, or when traffic exceeds a predetermined bandwidth, The purpose is to realize a low loss to avoid disposal. In the conventional priority transfer control, the IP packet transfer flow is divided into several classes according to the traffic characteristics based on the IP header / TCP header information, and priority transfer control set for each hierarchy is performed ( For example, refer nonpatent literature 1 or 2.).

  An example of conventional priority transfer control will be described with reference to FIG. FIG. 16 is a diagram illustrating an example of a conventional priority transfer control method. For example, according to the traffic classification shown in FIG. 16, in the bidirectional stream type traffic such as VoIP telephone and bidirectional video communication, the lowest delay, low loss, low fluctuation, etc. are ensured in order to guarantee real-time performance. As such, it is classified into the highest priority transfer class.

  Further, transaction type traffic that requires transaction processing such as Internet electronic commerce information and device control information is classified into a priority transfer class according to the highest priority. In addition, file transfer traffic such as file transfer by Web access, FTP, or VOD (Video on Demand) only needs to ensure a certain quality only in the traffic from the server to the client, that is, in the downlink direction. Are classified into so-called best-effort classes using surplus bandwidth of the highest priority and priority transfer classes. Also, e-mails and the like are classified into the best effort type class using the surplus bandwidth of the upper class.

  In the prioritized transfer control technique, IP packet transfer is prioritized by such a classification method. In addition, in the IP network, even when a packet loss due to discard or the like occurs, the IP network does not have a function to compensate for the discarded packet, and the packet is discarded by retransmission control by TCP (Transmission Control Protocol) which is a higher-level protocol of IP. Compensation is performed.

Toshiaki Tsuchiya, Quality Standards and Control at NGN, NTT Technical Journal Vol.20, No.6, 30-31,2008 Masahiro Miyasaka, Koki Horime, Koji Kishida, Bandwidth Management and Control Technology in NGN, NTT Technology Journal Vol.20, No.10, 22-23,2008

  However, the conventional priority transfer control technology can perform priority transfer control based on traffic characteristics, but cannot perform priority transfer control based on the importance of information for IP network users. there were.

  In general, the importance of information transferred over a network should be determined by network users including information senders. Conventionally, in an IP network, QoS control based on communication quality is performed as priority transfer control of IP packets. In the IP layer, the contents of information, in particular, IP network users including information senders define themselves. There was no mechanism for preferentially forwarding IP packets according to the importance of the information.

  Therefore, when information is to be transferred according to the importance of information defined by the IP network user himself, priority transfer control using a protocol higher than the IP layer must be performed. Even in such a case, only the priority transfer control by QoS is performed in the lower IP layer, and there is a possibility of packet discard at the time of congestion. Therefore, priority transfer of information according to the importance of the information defined by the IP network user itself Control cannot be achieved.

  Also, Article 8, Paragraph 1 of the Telecommunications Business Law states that “If a telecommunications carrier has a natural disaster, an incident or other emergency, or it is likely to occur, disaster prevention or relief, traffic, "Telecommunication must be preferentially handled with the contents necessary for ensuring communication or ensuring the supply of power or maintaining order." Telecommunications carriers need to construct, operate, and maintain communication facilities for securing important communications, with communications requiring priority handling even in network congestion as important communications. In this case, it is considered that the determination as to whether or not the communication is important may be made by the above-mentioned IP network user.

  The information transfer method of the present invention is an information transfer method including a session control server that controls a session for a user terminal to transmit and receive a packet, and an edge router that transfers the packet. An acquisition unit that acquires the importance level of the packet transferred by the session from a user terminal that starts the session, and the edge router sets a parameter corresponding to the importance level in the packet, and corresponds to the parameter A transfer unit that classifies packets into classes and transfers the packets according to a transfer method corresponding to the classes is provided.

  According to the present invention, priority transfer control based on the importance of information for IP network users can be performed.

FIG. 1 is a diagram illustrating an example of a priority transfer control domain according to the first embodiment. FIG. 2 is a diagram illustrating an example of a traffic flow of the information transfer method according to the first embodiment. FIG. 3 is a functional block diagram showing an example of the configuration of the session control server of the information transfer method according to the first embodiment. FIG. 4 is a functional block diagram illustrating an example of the configuration of the edge node of the information transfer method according to the first embodiment. FIG. 5 is a functional block diagram showing an example of the configuration of the edge node of the information transfer method according to the first embodiment. FIG. 6 is a functional block diagram illustrating an example of the configuration of the edge node in the information transfer method according to the first embodiment. FIG. 7 is a functional block diagram illustrating an example of the configuration of the edge node in the information transfer method according to the first embodiment. FIG. 8 is a diagram illustrating an example of a priority determination method of the information transfer method according to the first embodiment. FIG. 9 is a diagram illustrating an example of a priority determination method of the information transfer method according to the first embodiment. FIG. 10 is a diagram illustrating an example of a priority determination method of the information transfer method according to the first embodiment. FIG. 11 is a diagram illustrating an example of a priority determination method of the information transfer method according to the first embodiment. FIG. 12 is a sequence diagram illustrating an example of information transfer method processing according to the first embodiment. FIG. 13 is a flowchart illustrating an example of information transfer method processing according to the first embodiment. FIG. 14 is a diagram illustrating an example of a priority transfer control domain according to the second embodiment. FIG. 15 is a diagram illustrating an example of a computer that realizes a session control server or an edge router in an information transfer method by executing a program. FIG. 16 is a diagram illustrating an example of a conventional priority transfer control method.

  Hereinafter, embodiments of an information transfer method, a session control server, an edge router, an information transfer method, and an information transfer program according to the present application will be described in detail with reference to the drawings. Note that the information transfer method, the session control server, the edge router, the information transfer method, and the information transfer program according to the present application are not limited by this embodiment.

[First Embodiment]
In the following embodiments, the configuration of the information transfer method according to the first embodiment, the processing flow of each device in the information transfer method will be described in order, and finally the effects of the first embodiment will be described.

  First, in the first embodiment, in the IP network, the IP packet priority transfer control is performed according to the importance of the information defined by the IP network user, independently of the function of the protocol higher than the IP layer. As a method, the importance index of information defined by the network user and its importance (rating / rank) are converted into QoS control parameters, thereby diverting the conventional QoS control mechanism of the IP network.

  This is because the higher the importance rank of the information defined by the IP network user is, the more the IP packet needs to be transferred with priority over other IP packets, and further, it is discarded at the IP layer. It is based on the technical idea that it needs to be avoided as much as possible.

  In addition to the method described above, the IP is determined according to the important index of information defined by the network user and its importance (rating / rank) independently of the QoS control mechanism performed in the conventional IP network. It may be possible to construct a new mechanism for priority transfer control of packets.

[Configuration of First Embodiment]
The priority transfer control in the first embodiment diverts a DiffServ (Differentiated Services) method, which is a form of QoS control in a conventional IP network. Note that the conventional method that can be diverted in the present invention is not limited to the DiffServ method. In the DiffServ system, DSCP (Differentiated Services Code Point) is assigned as control information to the DS field that is the upper 6 bits of the TOS field in the IP header of the IP packet flow according to the traffic characteristics shown in FIG. Performs priority transfer control. An IP network domain composed of a group of IP packet transfer apparatuses that perform priority transfer by DSCP is called a DS domain. The DS domain has a function of assigning a DSCP value. The DS domain has an edge node such as an SSE (Subscriber Service Edge) deployed at the edge, a BCR (Block Core Router) that does not have a function of assigning a DSCP value, and controls transfer only by the assigned DSCP value, and the like. With core nodes.

  First, the priority transfer control domain defined in the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating an example of a priority transfer control domain according to the first embodiment. The priority transfer control in the first embodiment is performed in the priority transfer control domain. As shown in FIG. 1, similar to the DS domain, the priority transfer control domain also includes an edge node (EN: Edge Node) having a function of generating control information and assigning it to an IP packet, and only control information assigned by the edge node. A core node (CN) that performs priority transfer control in the priority transfer control domain is included. For example, in the first embodiment, the function of EN is implemented in SSE, and the function of CN is implemented in BCR, so that the DS domain of the DiffServ system and the priority transfer control domain in the first embodiment are matched. You may do it.

  As shown in FIG. 1, UNs (User Networks) 1 to 4 that are networks outside the priority transfer control domain are connected to ENs 1 to 4 via UNIs (User Network Interfaces) 1 to 4, respectively. Further, the priority transfer control domain is connected to an IP network of another provider (not shown), and can perform communication by IP. In addition, when UNI1-4 are access networks, IP packets transmitted from UNI1-4 are stored in Ethernet frames on the access network and delivered to EN1-4 by a protocol different from IP. Also in the access network, priority transfer control based on Ether frame header information can be performed.

  In the first embodiment, for example, an IP packet flow entering the priority transfer control domain from UN1 may be given priority transfer control information at EN1 and transferred to UN2 via CN1, CN2, and EN2. is there. In such a case, the IP packet flow with the QoS control defined by the network user and the IP packet with the transfer control information generated according to the importance is mixed and controlled in the IP packet flow by the conventional QoS control. Will be.

  The outline of the information transfer method and traffic flow of the first embodiment will be described with reference to FIG. FIG. 2 is a diagram illustrating an example of a traffic flow of the information transfer method according to the first embodiment. As shown in FIG. 2, UN1 is connected to EN1 by UNI1. Then, IP packets are transmitted and received between the transmission-side user terminal 20 on UN1 and the reception-side user terminal 30 on UN2. The transmission side user terminal 20 includes a Web terminal 21, an IP phone 22, and a priority transfer request terminal 23. The receiving-side user terminal 30 includes a Web server 31, an IP phone 32, and a preferential transfer receiving terminal 33. Here, the priority transfer requesting terminal 23 and the priority transfer receiving terminal 33 are terminals that transfer IP packets subject to priority transfer control, which is a feature of the present invention, and include various servers such as servers, portable terminals, and IP phones. It may be an existing terminal, and the type of terminal is not particularly limited.

  As shown in FIG. 2, the voice traffic 42 by the IP packet flow between the IP phone 22 and the IP phone 32 is classified into class 1 which is the highest priority class in QoS control by the DiffServ method and is preferentially transferred. On the other hand, the Web data traffic 41 that is an IP packet flow between the Web terminal 21 and the Web server 31 is classified into a class 4 that is a best effort class. Further, the priority transfer traffic 43 which is an IP packet flow between the priority transfer request terminal 23 and the priority transfer reception terminal 33 is classified into class 1 which is the highest priority class, and is mixed with the IP packet in the voice traffic 42. Priority transfer control is performed. Here, the session control server 10 controls a session for the user terminal to transmit and receive packets. EN1 functions as an edge router that transfers packets. Note that the priority transfer control shown in FIG. 2 is realized by controlling the DSCP setting and class classification under the control of the session control server 10.

  The session control server 10 will be described with reference to FIG. FIG. 3 is a functional block diagram showing an example of the configuration of the session control server of the information transfer method according to the first embodiment. As shown in FIG. 3, the session control server 10 includes a user information management unit (NASS: Network Attachment SubSystem) 11, a SIP session control unit (CSCF: Call Session Control Function) 12, and a network bandwidth management unit (RACS: Resource and Admission). Control Subsystem) 13.

  In response to an IP packet transmission request from a user terminal, the CSCF 12 performs session control such as establishment or disconnection of a session with an IP packet delivery destination by SIP (Session Initiation Protocol). The NASS 11 performs IP address assignment and authentication processing to the user terminal.

  The RACS 13 performs QoS control and priority transfer control for the EN. The CSCF 12 determines a required bandwidth and transfer quality necessary for normal QoS control from media information described in SIP SDP (Session Description Protocol) at the time of session establishment, and notifies the RACS 13 of the required bandwidth. The SIP message (INVITE) transmitted from the user terminal on the transmission side includes information indicating the type of media (audio, video, data) and the communication mode (transmission / reception, transmission only, reception only). The CSCF 12 reads these pieces of information from the SIP message, and determines the required bandwidth and transfer quality according to the read information.

  The CSCF 12 notifies the required bandwidth and transfer quality to the RACS 13. Then, the RACS 13 instructs the EN1 to secure the bandwidth and perform priority transfer. Here, the RACS 13 stores and manages the physical transfer network configuration as a virtual path connection configuration. Thereby, it is determined whether or not the required bandwidth notified from the CSCF 12 can be secured in the virtual path, and the request determined to be possible (acceptance is permitted) is set to EN1 as a reservation state. In addition, the RACS 13 sets the reservation state to EN2 that accommodates the receiving terminal for the user terminal on the receiving side as well. Thereby, a session for QoS control is established between the transmission-side user terminal 20 and the reception-side user terminal 30.

  In EN1 in which the reservation state is set, DSCP corresponding to each transfer quality is set for each session based on the notification from CSCF 12. Then, according to the transfer method set for each class classified based on the DSCP value set in EN1, IP packets in CN1, CN2, and EN2 passing through the path are transferred. In the following description, the DSCP value set here is referred to as a DSCP value based on media information.

  Further, the CSCF 12 requests the user terminal that has requested transmission of the IP packet whether or not the information that the user intends to transmit is requested to be transmitted as important information, or is requested by the user. Queries the transfer quality rank. Here, the importance index of the important information defined by the user, the rank to which each index is assigned, and the designation method thereof are fixedly agreed between the user terminal and the CSCF 12 in advance. . Note that the importance may be set for each packet or may be set for each session. When importance is set for each session, the importance of packets transmitted in the session can be made constant.

  In addition, the CSCF 12 acquires the importance of information by inquiring to the user terminal. Then, the RACS 13 determines a DSCP value corresponding to the importance based on the notification from the CSCF 12. EN1 then sets the DSCP value in the packet. In the following description, the DSCP value set here is referred to as a DSCP value based on user-defined importance. The function for determining the DSCP value may be provided in the session control server or may be provided in the edge node.

  As described above, the CSCF 12 functions as an acquisition unit that acquires the importance of a packet transferred by a session from a user terminal that starts the session. EN1 sets a parameter corresponding to the importance acquired by CSCF 12 in the packet, classifies the packet into a class corresponding to the parameter, and transfers the packet according to the transfer method corresponding to the class. It functions as a part. The parameter is a DSCP value in the first embodiment. In this embodiment, the RACS 13 of the session management server 10 functions as a determination unit that determines a parameter corresponding to the importance level. The determination unit is not limited to the session management server 10 and may be provided in the EN1.

  Here, the configuration of the edge node in the information transfer method will be described with reference to FIG. FIG. 4 is a functional block diagram illustrating an example of the configuration of the edge node of the information transfer method according to the first embodiment. As shown in FIG. 4, EN1 includes MF Classifier 101, Marker 102, Matching Filter 103, BA Classifier 104, Meter 105, Marker 106, Dropper 107, Shaper 108, Queue Manager 109, Buffer 110, and Scheduler 111.

  The MF Classifier 101 is a functional unit that detects and identifies an IP packet flow based on preset conditions for the IP packet received by the EN 1, and is realized by the control of the CSCF 12 and the RACS 13. The Marker 102 sets a DSCP value based on media information in accordance with an instruction from the RACS 13 for QoS control.

  When the DSCP value based on the user-defined importance is set, the matching filter 103 overwrites the DSCP value set by the Marker 102 with the DSCP value based on the user-defined importance. Further, the Matching Filter 103 does not overwrite the DSCP value set by the Marker 102 when the DSCP value based on the user-defined importance is not set. The Matching Filter 103 may convert the DSCP value into a corresponding class using a conversion table, and can be tuned by changing the table dynamically or statically.

  The BA Classifier 104 determines an output priority and a queuing priority based on the DSCP value of the input IP packet, and classifies the IP packet flow into a class corresponding to the priority. The Meter 105 monitors the band used for each DSCP, and notifies the subsequent Marker 106, Dropper 107, and Shaper 108 of the band in use. The Marker 106 assigns the DSCP value assigned to the IP packet in the violating band again. The dropper 107 discards the band-over packet based on the state of the in-use band notified from the meter 105. The shaper 108 controls the packet output order and output band based on the state of the in-use band notified from the meter 105. The queue manager 109 controls queuing for a predetermined class corresponding to the priority. The scheduler 111 transmits a packet based on scheduling control.

  Further, as shown in FIG. 5, the functions of the Marker 102 and the Matching Filter 103 in the configuration shown in FIG. 4 may be integrated into the Marker 102a. In this case, the DSCP value based on the user-defined importance is notified directly from the RACS 13 to the Marker 102a.

  Moreover, as shown in FIG. 6, it is good also as a structure provided with Compensator 105a. The Compensator 105a compensates for a discarded packet by sending a packet of a high priority class, which has been determined to exceed the bandwidth by the Meter 105, to the Shaper 108 bypassing the Dropper 107. Further, since a packet of a low priority class does not require compensation, the packet is sent to the Dropper 107 to perform normal discard processing.

  Moreover, as shown in FIG. 7, it is good also as a structure which provided Packet fairing112. The packet fairing 112 performs fragmentation avoidance and queuing efficiency by performing packet shaping, structuring by setting the packet length to a fixed size, and the like.

  8 to 11, the priority realized by inquiry to the user terminal by CSCF 12 and acquisition of importance, or determination of transfer quality, determination of DSCP value in RACS 13, setting of DSCP in EN 1, class classification by DSCP A specific example of determining the degree will be described. 8 to 11 are functional block diagrams illustrating an example of the priority determination method of the information transfer method according to the first embodiment.

  First, an example of binarizing and ranking the 6-dimensional importance index of the service information attribute will be described with reference to FIG. When a large amount of renewable energy is connected in the power transmission / distribution network and the power system becomes unstable, monitoring and real-time control of the required devices are required. In addition, it is necessary to send emergency evacuation information to residents in the event of a disaster. Assuming such a case, it is conceivable to set urgency, accuracy (probability of information), seriousness, interrelationship, wide area, and continuity of emergency events as indicators of information importance. In this case, the user ranks each of the six importance indexes with a binary value of large: 1 and small: 0. For example, if the user evaluates as urgency rank 1, accuracy rank 1, severity rank 0, relevance rank 0, broadness rank 1, event continuity rank 0, RACS 13 obtains these evaluation results, By arranging the values, a DSCP value “110010” can be obtained.

  Furthermore, class classification may be performed by converting the DSCP values set by the method shown in FIG. 8 by the method shown in FIG. As shown in FIG. 9, first, if the urgency rank is 1, the RACS 13 determines a DSCP value corresponding to the class A that is the highest priority class regardless of other importance indexes (step S101, Yes). In addition, even when the urgency rank is 0 (No at Step S101), the RACS 13 is classified into Class A regardless of other importance indexes when the accuracy rank is 1 (Yes at Step S102). Determine the corresponding DSCP value. Similar processing is performed for the other indexes. Note that the setting of the importance index and the generation of the DSCP value based on the importance rank are optional under the 6-bit restriction of the DS field that is the setting range of the DSCP value, and are generated based on the user definition. Allocation of the current QoS control to the class classification for DSCP can be negotiated in advance with the network service provider.

  Next, an example in which the user (network user) himself sets the importance index and the importance rank will be described with reference to FIG. As shown in FIG. 10, even if some information is allowed to be missing, the user is required to transmit in the shortest time (low delay), and even if some information is missing, the entire information is within a certain time. Completeness that requires completion of transmission in the network, continuity that requires transmission of each packet interval within a certain time (streaming), reachability that requires minimization of packet loss / discard, and broadcast delivery request It is possible to set each index of broadcast property that designates presence or absence. Then, the RACS 13 ranks the four importance indexes excluding the broadcast property among the above-mentioned indexes at four levels (3 to 0), and ranks the broadcast property index in two steps as the presence / absence thereof. However, when the multicast function is used as having the broadcast capability, it is necessary to cooperate with the Multicast function.

  Then, when the user performs a rating by the method shown in FIG. 10, it may be determined to directly assign each DSCP value to the user's rating as shown in FIG. As shown in FIG. 11, for example, in the case of express delivery rank 3, completeness rank 3, continuity rank 2, and reachability rank 2, RACS 13 is set as a DSCP value corresponding to class B which is a semi-priority transfer class. Decide to assign "111100". Further, for example, in the case of express delivery rank 1, completeness rank 3, continuity rank 3, and reachability rank 1, RACS 13 determines to allocate “111000” as the DSCP corresponding to class C. The setting of the importance index shown in FIG. 11 and the generation of the DSCP value based on the importance rank are arbitrary under the 6-bit restriction of the DS field that is the setting range of the DSCP value, and are generated based on the user definition. Allocation of the current QoS control to the class classification for DSCP can be negotiated in advance with the network service provider.

[Process of First Embodiment]
The process of the first embodiment will be described with reference to FIGS. FIG. 12 is a sequence diagram illustrating an example of information transfer method processing according to the first embodiment. As shown in FIG. 12, first, the transmission-side user terminal 20 sends an IP packet transmission request to the session control server 10 (step S201). Then, the session control server 10 determines a necessary bandwidth and transfer quality necessary for QoS control (step S202). Next, the session control server 10 establishes a session between the transmission-side user terminal 20 and the reception-side user terminal 30 (Step S203). Then, the session control server 10 notifies the required bandwidth and transfer quality to EN1 (step S204).

  EN1 sets the DSCP value for the packet based on the notified transfer quality (step S205). Here, the session control server 10 inquires about the importance of the information to be transmitted to the transmission-side user terminal 20 (step S206). Then, the transmission-side user terminal 20 notifies the importance level to the session control server 10 (step S207). Furthermore, the session control server 10 notifies the EN1 of the importance level notified from the user or the determined DSCP value (step S208). EN1 resets the DSCP value for the packet (step S209), and transmits the IP packet in a predetermined class based on the DSCP value (step S210).

  Next, details of the processing in EN1 will be described with reference to FIG. FIG. 13 is a flowchart illustrating an example of information transfer method processing according to the first embodiment. First, the MF Classifier 101 detects and identifies an IP packet (Step S301). Next, the Marker 102 sets a DSCP value for the packet (step S302). When the importance setting by the user is performed, that is, when the DSCP value based on the user-defined importance is set (Yes in step S303), the DSCP value is determined by the DSCP value based on the user-defined importance. Is reset (step S304). Then, the BA Classifier 104 classifies the priority class based on the DSCP value (step S305).

  If the packet is a violation band (step S306, Yes), the DSCP value is reset by the marker 106 (step S307). If the packet is out of bandwidth (step S308, Yes), it is discarded by the dropper 107 (step S309). Thereafter, the shaper 108 controls the output bandwidth and output order of the packets (step S310). Then, the queue manager 109 controls queuing (step S311). Finally, the scheduler 111 transmits a packet based on scheduling control (step S312).

[Effect of the first embodiment]
The session control server 10 acquires the importance of the packet transferred from the user terminal that starts the session. In EN1, a parameter corresponding to the importance is set in the packet as a DSCP value, the packet is classified into a class corresponding to the DSCP value, and the packet is transferred according to a transfer method corresponding to the class. This makes it possible to perform priority transfer control based on the importance of information for the IP network user while effectively utilizing the existing IP network. Furthermore, the development scale required for adding the priority transfer control function can be minimized, and the use cost can be minimized for the network user.

[Second Embodiment]
In the first embodiment, the case where priority transfer control is performed in one priority transfer domain has been described. However, priority transfer control may be performed between a plurality of priority transfer domains. The second embodiment will be described with reference to FIG. FIG. 14 is a diagram illustrating an example of a priority transfer control domain according to the second embodiment. FIG. 14 shows an inter-domain connection configuration in which priority transfer control domains are connected and unified priority transfer control is performed by both. The SEN 12 that is the edge node of the domain 1 and the SEN 21 that is the edge node of the domain 2 are connected, and the DSCP value generated based on the user-defined importance index and the importance rank and the priority class between the two domains. Unify correspondence. Thereby, priority transfer is possible between a plurality of priority transfer domains.

[Other Embodiments]
In the above embodiment, the parameter for classification is a DSCP value, but a value represented by another bit string can also be a parameter. For example, when classifying by the method shown in FIG. 8 using a parameter represented by an n-bit bit string, the index is changed from 6 to n, and the user evaluates the n indices in binary. Can be set in the packet as a parameter by converting the importance to 1 or 0 and arranging the converted values as parameters. As a result, the present invention is not limited to the method using the DSCP value, and can be applied to a method using other parameters.

  In addition, the method shown in FIG. 11 stores a table in which a combination of indices and numerical values obtained as a result of ranking a plurality of indices by the user and parameters corresponding to the combinations are registered, and the table is referred to. However, it may be realized by setting a parameter corresponding to the combination in the packet. In this case, the system operation can be tuned by changing the value registered in the table.

[System configuration, etc.]
Further, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. Further, all or any part of each processing function performed in each device is realized by a CPU (Central Processing Unit) and a program analyzed and executed by the CPU, or hardware by wired logic. Can be realized as

  In addition, among the processes described in the present embodiment, all or part of the processes described as being automatically performed can be manually performed, or the processes described as being manually performed can be performed. All or a part can be automatically performed by a known method. In addition, the processing procedure, control procedure, specific name, and information including various data and parameters shown in the above-described document and drawings can be arbitrarily changed unless otherwise specified.

[program]
FIG. 15 is a diagram illustrating an example of a computer that realizes a session control server or an edge router in an information transfer method by executing a program. The computer 1000 includes a memory 1010 and a CPU 1020, for example. The computer 1000 also includes a hard disk drive interface 1030, a disk drive interface 1040, a serial port interface 1050, a video adapter 1060, and a network interface 1070. These units are connected by a bus 1080.

  The memory 1010 includes a ROM (Read Only Memory) 1011 and a RAM (Random Access Memory) 1012. The ROM 1011 stores a boot program such as BIOS (Basic Input Output System). The hard disk drive interface 1030 is connected to the hard disk drive 1090. The disk drive interface 1040 is connected to the disk drive 1100. For example, a removable storage medium such as a magnetic disk or an optical disk is inserted into the disk drive 1100. The serial port interface 1050 is connected to a mouse 1110 and a keyboard 1120, for example. The video adapter 1060 is connected to the display 1130, for example.

  The hard disk drive 1090 stores, for example, an OS 1091, an application program 1092, a program module 1093, and program data 1094. That is, a program that defines each process of the session control server or the edge router is implemented as a program module 1093 in which a code executable by a computer is described. The program module 1093 is stored in the hard disk drive 1090, for example. For example, a program module 1093 for executing processing similar to the functional configuration in the session control server or the edge router is stored in the hard disk drive 1090. The hard disk drive 1090 may be replaced by an SSD (Solid State Drive).

  The setting data used in the processing of the above-described embodiment is stored as program data 1094 in, for example, the memory 1010 or the hard disk drive 1090. Then, the CPU 1020 reads the program module 1093 and the program data 1094 stored in the memory 1010 and the hard disk drive 1090 to the RAM 1012 and executes them as necessary.

  The program module 1093 and the program data 1094 are not limited to being stored in the hard disk drive 1090, but may be stored in, for example, a removable storage medium and read out by the CPU 1020 via the disk drive 1100 or the like. Alternatively, the program module 1093 and the program data 1094 may be stored in another computer connected via a network (LAN (Local Area Network), WAN (Wide Area Network), etc.). The program module 1093 and the program data 1094 may be read by the CPU 1020 from another computer via the network interface 1070.

DESCRIPTION OF SYMBOLS 10 Session control server 20 Transmission side user terminal 30 Reception side user terminal 21 Web terminal 22, 32 IP telephone
31 Web Server 23 Priority Transfer Request Terminal 33 Priority Transfer Receiving Terminal 101 MF Classifier
102, 102a Marker
103 Matching Filter
104 BA Classifier
105 Meter
105a Compensator
106 Marker
107 Dropper
108 shaper
109 Queue Manager
110 Buffer
111 Scheduler
112 Packet fairing

Claims (8)

An information transfer method comprising a session control server that controls a session for a user terminal to transmit and receive a packet, and an edge router that transfers the packet,
The session control server includes an acquisition unit that acquires the importance of the packet transferred by the session from a user terminal that starts the session,
The edge router includes a transfer unit that sets a parameter corresponding to the importance level in the packet, classifies the packet into a class corresponding to the parameter, and transfers the packet according to a transfer method corresponding to the class. An information transfer method characterized by this. The parameter is a DSCP value;
The acquisition unit acquires, as the importance, a result of a user evaluating a binary index of the same number of digits as the DSCP value,
A determination unit that converts a result of evaluation with the binary value into 1 or 0, and determines a bit string in which the converted values are arranged as the parameter;
The information transfer method according to claim 1, wherein the transfer unit sets the parameter determined by the determination unit in the packet. A storage unit for storing a table in which a combination of an index and a numerical value obtained as a result of ranking a plurality of indexes by a user and the parameter corresponding to the combination is stored;
The acquisition unit acquires the combination as an importance level,
A determination unit that refers to the table and determines the parameter corresponding to the combination as the packet;
The information transfer method according to claim 1, wherein the transfer unit sets the parameter determined by the determination unit in the packet. A session control server that controls a session for a user terminal to send and receive packets,
A session control server, comprising: an acquisition unit that acquires importance of the packet transferred by the session from a user terminal that starts the session and determines a parameter corresponding to the importance. An edge router that forwards user terminal packets,
Transfer that sets a parameter corresponding to the importance of the packet acquired from the user terminal to the packet, classifies the packet into a class corresponding to the parameter, and transfers the packet according to a transfer method corresponding to the class An edge router comprising a portion. An information transfer method executed by an information transfer method including a session control server that controls a session for a user terminal to transmit and receive a packet, and an edge router that transfers the packet,
The session control server acquires an importance level of the packet transferred by the session from a user terminal that starts the session;
A transfer step in which the edge router sets a parameter corresponding to the importance in the packet, classifies the packet into a class corresponding to the parameter, and transfers the packet according to a transfer method corresponding to the class;
An information transfer method comprising:   An information transfer program for causing a computer to function as the session control server according to claim 4.   An information transfer program for causing a computer to function as the edge router according to claim 5.

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