JP4156543B2 - Service providing platform equipment - Google Patents

Description

  The present invention belongs to a technical field related to high functionality and high performance of a service providing platform device capable of providing a network-based supplementary service among transfer nodes of a main transfer network among Internet technologies.

  Non-Patent Document 1 describes an OPES system that is one form of providing a service in a network. In Non-Patent Document 1, the interface between the OPES processor and the callout server depends on the service because a specific protocol or sequence called OCP is required. In other words, it is difficult to define a unified sequence that absorbs differences between services. As a result, platform devices may need to be modified each time a service is added. Also, the transfer protocol in the main transfer network, particularly the layer 2 protocol, is not standardized, and there are various protocols. The protocol of the main transfer network is, for example, Ethernet, a tunneling protocol such as PPTP (Point to Point Tunneling Protocol), or a label transfer protocol such as MPLS (Mult Protocol Label Switching).

Network Working Group Internet-Draft, “An Architecture for Open Pluggable Edge Services (OPES)”, December 11, 2002, [online], [Search February 25, 2004], Internet <http: //www.ietf. org / internet-drafts / draft-ietf-opes-architecture-04.txt>

  In order to be able to apply to a variety of IP (Internet Protocol) transfer networks in the tunneling transfer system-compatible service providing platform device, the internal packet processing unit is configured as a two-layer structure of a general-purpose processing unit and a main line dependent unit, and transfers the main line dependent unit. It can be applied to various networks by rearranging the system processing functions. In addition, depending on the network to which the platform device is applied or the deployment position in the application network, there are various main line transfer methods, and not only a pure Ethernet environment but also a label transfer method such as MPLS or a remote access VPN. Application to a network in which a dedicated transfer header or transfer identifier is used when transferring a packet, such as an L2 tunneling transfer method, is also conceivable. The transfer method processing unit of the main line dependent unit can be assigned to a service device (service network) externally attached to the platform device by attaching / detaching a dedicated transfer header or transfer identifier regardless of the main line transfer method. Yes.

  However, for communication packets using a dedicated transfer header or transfer identifier that is used in the tunneling method of the main transfer network, a detachment processing method such as a dedicated transfer header particularly related to service distribution processing has not been established. In addition, since there is no desorption processing method that takes into account the case where the number of packets and packet length in the service device (service network) change, or a desorption processing method specific to the tunneling transfer method, the main transfer network uses the tunneling transfer method. It is impossible to deal with.

  When the platform device is applied to a tunneling transfer network or a label transfer method in which a dedicated transfer header or transfer identifier is used, if the dedicated transfer header or transfer identifier is still attached, service distribution and various services in the service device are performed. Processing is impossible. Therefore, it is necessary to detach / attach the dedicated transfer header or transfer identifier. Saving and reassigning a dedicated transfer header or transfer identifier in units of packets is not practical from the viewpoint of processing load or storage memory capacity. It is an object of the present invention to provide a service providing platform device installed between a plurality of transfer nodes in a main transfer network for transferring a packet by adding a dedicated transfer header or transfer identifier to the packet. It is another object of the present invention to solve a method for detaching (header storage, giving) a dedicated transfer header or transfer identifier of a packet.

  In addition, since various service processes are performed in the service distribution device, it can be assumed that the number of packets increases or decreases, the packet length, and the size change when the service device is input and when the service device is output. When the platform device transfers the dedicated transfer header or transfer identifier to the service device after storing it, and adds the stored header to the return packet from the service device, the change in the number of packets and the packet length depends on the header desorption process. Problems arise. An object of the present invention is to solve a dedicated transfer header or transfer identifier detachment processing (header storage, assignment) method that does not depend on an input packet.

  In particular, in the tunneling transfer network, packet input that is fragmented by the lower IP header of the user packet is assumed. It is difficult to reconstruct the fragment packet and fragment the corresponding packet from the service device as it is. The present invention considers the fragment handling process equivalent to dividing and outputting to the main transfer network as before while applying a simple reconfiguration process to the fragment packet input from the main transfer network. An object is to solve a method for detaching (storing and assigning) a dedicated transfer header or transfer identifier.

A service providing platform device installed between a plurality of transfer nodes in a main transfer network for transferring a packet by assigning a dedicated transfer header or transfer identifier to the packet, and performing one or more service processing Means for connecting to a service device via a service network; means for storing the dedicated transfer header or transfer identifier of a user data packet input from the main transfer network; and a user data packet input from the main transfer network Means for removing the dedicated transfer header or transfer identifier from the service network and transferring it to the service device via the service network, and the dedicated data stored for the packet input from the service device via the service network A transfer header or transfer identifier, and the dedicated transfer header or transfer identifier There has means for outputting to the main transfer network the granted packets to the destination for the user terminal. Further, there is provided means for storing only the packet header information fixed element that does not change the dedicated transfer header or transfer identifier information for each user communication flow, and means for managing the table of the packet header information fixed element. In addition, the means for storing only the packet header information fixed element that does not change for each user communication flow, the means for storing the dedicated transfer header or transfer identifier information in cooperation with the tunnel setting authentication accompanying the user network connection authentication, or the user Means for storing only the first packet in the communication flow as a storage target is provided. Further, for a packet input from the service device via the service network, a dedicated transfer header or transfer identifier is set based on the packet header information fixed element stored by the means for managing the packet header information fixed element. And means for outputting the packet to which the dedicated transfer header or transfer identifier is added to the main transfer network for the destination user terminal. Further, for a packet input from the service device via the service network, a dedicated transfer header or transfer identifier is set based on the packet header information fixed element stored by the means for managing the packet header information fixed element. The means for assigning means for identifying a packet for each user communication flow, and means for managing the packet header information fixed element in a table, and storing header information in which the packet header information fixed element that does not change for each user communication flow is table managed. Means for searching and assigning the packet header information fixed element for the user communication flow to be assigned. Also, after assigning a dedicated transfer header or transfer identifier to a packet input from the service device via the service network, a packet header information variable element including a header length and a packet length is calculated for each added header. It has means to give. In addition, in the main transfer network in which a dedicated transfer header or transfer identifier is used when an output packet to the transfer network to which the dedicated transfer header or transfer identifier is assigned is output and transferred to the main transfer network. Means for calculating a packet size that is within the maximum transfer packet size. Further, a main transfer header or transfer identifier is used when the packet size obtained by the packet size calculation means is output and transferred to the main transfer network with respect to the output packet from the platform to the transfer network. If it is larger than the maximum transfer packet size in the transfer network, the datagram is divided in the lower IP header of the user IP packet at the maximum transfer size, and if it is smaller than the maximum transfer packet size, it is unprocessed and transferred to the destination user terminal. Means for outputting to the network. In addition, for a fragment packet that has been subjected to a datagram division process at a lower IP of a user packet input from the transfer network using the dedicated transfer header or transfer identifier to the platform device, the fragment packet is set to a fragment IP header. Means for detecting from information identifier information and flag information and offset information, means for allocating a reconfiguration buffer area for reconfiguration based on identifier information of fragment IP header information after detecting the fragment packet, Means for starting a timer for releasing the buffer area after time; means for reconfiguring the buffer as soon as all the fragment packets are input from the main transport network to the platform device; and after the reconfiguration process, Dedicated transport header Others and means for transferring the means for storing the transfer identifier. Further, the dividing process for the packet input from the service device via the service network without identifying and managing the reconstructed packet depends on the dividing process. The transfer method of the main transfer network is a label transfer method or a tunneling transfer method.

  (1) Even when the main line transfer network has a dedicated transfer header or transfer identifier such as a label transfer method or a tunneling transfer network, it is input from the main line by the desorption processing function of the dedicated transfer header or transfer identifier. Can be distributed to an external service network.

  (2) Only a header information fixed element such as a dedicated transfer header in a dedicated transfer header detachment process for main line packets is stored in cooperation with tunnel setting authentication accompanying user network connection authentication, or in an arbitrary communication flow The method of saving from the first packet and the method of calculating and assigning the header information variable element after giving the saved header information fixed element do not need to give the header in each packet unit, and it is not necessary to give it as it is. In addition, it is possible to reduce the load of processing for adding and save a memory area for storing the header.

  (3) The dedicated transfer header storage method and calculation addition method make it possible to easily restore the stored header in response to changes in the number of packets or the packet length of the original packet from the service device. Desorption processing operations such as a dedicated transfer header can be performed regardless of the input packet to the platform device, that is, without managing the input packet, and the header storage and assignment processing load can be reduced.

  (4) Fragment input from the main transfer network without re-fragmenting the corresponding packet from the service device, reconfiguring the packet fragmented by the lower IP header of the user packet, especially in the tunneling transfer network While applying simple reconfiguration processing to packets, fragment processing is equivalent to dividing and outputting to the main transfer network as before, that is, depending on the maximum transfer size of the main transfer network before the platform output processing. By performing the recalculation process, the fragment packet processing load can be reduced, and the fragment packet handling process and the packet loss / packet length change handling process can be unified with the dedicated transfer header adding process, which can be economical.

  (5) According to the present invention, it is possible to realize high performance of main line transfer packet processing while maintaining transparent connection operation to adjacent transfer nodes in the main line transfer network.

  Hereinafter, embodiments of the present invention will be described in the case where the main line transfer network is provided with a dedicated transfer header or transfer identifier mainly for the label transfer method or tunneling transfer method equivalent to layer 2.

  FIG. 1 is a system configuration schematic diagram of the embodiment. In the multiple IP transfer network 1 in which one or one or more user terminals 6 may be connected to one or more external networks, transfer nodes 21 and 22 and a tunneling transfer method compatible service providing platform device 3 are provided. The service providing platform device 3 is installed between the forwarding nodes 21 and 22. Various service devices 51 and 52 arranged in the service network 4 are connected to the IP transfer network 1 via the service providing platform device 3. The service device 5 (the service devices 51, 52,... Are collectively referred to as 5) and the service providing platform device 3 are connected via the service network 4 with a general-purpose interface such as Ethernet. The terminal 6 is connected to the IP transfer network 1 via the transfer node 21 by a connection method such as a public network (ISDN), ADSL, or Ethernet (LAN). As the terminal 6, for example, a desktop personal computer is used. The service devices 51 and 52 that are installed in the service network 4 and perform service processing are, for example, various service servers such as a content server. In order to use this service from the terminal 6, the user connects with the terminal 6 and an access method depending on the connection method of the IP transfer network 1. All user packets whose source or destination is the terminal 6 are assumed to pass between the forwarding nodes 21 and 22 and are input / output to / from the service providing platform device 3. The user registers in advance in the service providing platform device 3 which service is to be used. The service providing platform device 3 transfers a packet whose source or destination is the terminal 6 via the IP transfer network 1 or the transfer nodes 21 and 22 to the service network 4 and the service device 5 registered in advance by the user.

  Further, the service providing platform apparatus 3 outputs the packet returned from the service network 4 and the service apparatus 5 to the service providing platform apparatus 3 to the IP forwarding network 1 or the forwarding nodes 21 and 22 with the terminal 6 as a transmission source or destination. To do.

  FIG. 2 is a device configuration schematic diagram of the service providing platform device. As shown in FIG. 2, the service providing platform device 3 of this embodiment includes a user I / F that is an interface with the user side, a network side interface that is an interface with the network side, and main line (transfer protocol) processing. The packet is distributed to the service device 5 based on the information indicating the unit 7 and the service device 5, or the service identifier is given to the packet when the packet is transferred to the service network 4 based on the service identifier of the service network 4. Then, a general-purpose (IP packet) processing unit that transmits a packet and receives a packet from the service device 5 is provided. The main line processing unit 7 includes a fragment processing unit 71, a header calculation processing unit 72, a header storage processing unit 73, and a header addition processing unit 74 as main line dependent units that perform processing depending on the main line.

  FIG. 3 is a functional block diagram of the main line processing unit 7. As described above, the main line processing unit 7 includes the fragment processing unit 71, the header calculation processing unit 72, the header storage processing unit 73, and the header addition processing unit 74, as well as the header management table 75, FIG. A main line interface connection unit 76 connected to the IP transfer network (main line) 1 via the user side I / F and the network side I / F, a general purpose processing connection unit 77 connected to the general purpose processing unit of FIG. Is provided. The fragment processing unit 71 includes a fragment detection processing unit 711, a reconfiguration buffer 712, a reconfiguration timer 713, an MTU (Maximum Transmission Unit) calculation processing unit 72, and a division processing unit 715.

  Hereinafter, when the main line transfer method is a packet with a dedicated transfer header or transfer identifier, such as a label transfer method or a tunneling transfer method, which is an important element of the service providing platform device 3, the dedicated transfer header or The transfer identifier storing process and storing method, and the assigning process and assigning method will be described with reference to FIGS.

  First, the input direction from the IP transfer network 1 to the service providing platform device 3 will be described.

  If the main line transfer method of the IP transfer network (main transfer network) 1 composed of the transfer nodes 21 and 22 is a packet with a dedicated transfer header or transfer identifier such as a label transfer method or a tunneling transfer method, a service is provided. The platform apparatus 3 stores the dedicated transfer header or transfer identifier in the main line processing unit 7 for all user packets whose source or destination is the input terminal 6, and the pre-registered service network 4. And the distribution process to the service device 5 is performed.

  The main line processing unit 7 stores the dedicated transfer header or transfer identifier in the header storage processing unit 73 for the dedicated transfer header or user packet with transfer identifier input from the main line interface unit 76. Only the packet header information fixed element that does not change for each user communication flow is subjected to header analysis as a storage target, and the storage header information is stored in the header management table 75.

  In the method of storing only the packet header information fixed element of the dedicated transfer header or transfer identifier, not all packet headers input to the main line processing unit 7 are to be stored, but the first ( (First) This is performed by storing in the header management table 75 as a storage target only for the packet.

  Simultaneously with the process of storing the packet header information fixed element of the dedicated transfer header or transfer identifier, the dedicated transfer header or transfer identifier is separated and transferred to the service network 4 and the service device 5 registered in advance by the user.

  Next, the output direction from the service providing platform device 3 to the IP transfer network 1 will be described.

  After the service processing is performed in the service device 5, the main line processing unit 7 assigns the dedicated transfer header or transfer identifier to a packet input from the service device 5 and the service network 4 to the service providing platform device 3. And output to the main transfer network for the destination user terminal.

  The dedicated transfer header or transfer identifier assigning process is such that only the packet header information fixing element of the stored dedicated transfer header or transfer identifier is applied to the packet input from the general-purpose processing connection unit 77. In step 74, the packet is added as an output packet from the service providing platform 3 to the transfer network.

  The dedicated transfer header or transfer identifier assigning method is such that the header assigning processing unit 74 identifies a packet for each user communication flow and sets a packet header information fixing element for the user communication flow to be assigned as a header management table 75. It is done by searching and giving more.

  In addition, after adding a packet header information fixed element that does not change for each user communication flow, the header calculation processing unit 72 calculates and adds packet header information variable elements such as a header length and a packet length to the added header.

  In addition, the main line transfer method restored by the assigning process and the assigning method uses the IP transfer network (main transfer network) 1 from the service providing platform device 3 for a dedicated transfer header or transfer identifier packet such as a label transfer method or a tunneling transfer method. At the time of output, the MTU calculation processing unit 714 calculates the packet size whether it is within the maximum transfer packet size in the main transfer network.

  The MTU calculation processing unit 714 calculates the packet size, determines whether it is within the maximum transfer packet size in the IP transfer network (main transfer network) 1, and determines the maximum transfer packet in the IP transfer network (main transfer network) 1. If it is larger than the size, the division processing unit 715 divides the datagram with the lower IP header of the user IP packet based on the maximum transfer size. If it is smaller than the maximum transfer packet size, it is output to the main transfer network for the destination user terminal unprocessed.

  Next, when the main line transfer network is a tunneling transfer method in particular, a fragment process for a fragment packet input in which a datagram is divided by a lower IP of a user packet and a method for storing and assigning a dedicated transfer header will be described.

  When the fragment packet is input from the main line interface connection unit 76, the fragment detection processing unit 711 detects the fragment packet from the identifier information, flag information, and offset information of the fragment IP header information. Next, the reconfiguration buffer unit 712 allocates a reconfiguration buffer area for reconfiguration based on the identifier information of the fragment IP header information. At the same time, a reconfiguration timer 713 for releasing the buffer area after a certain time is started. The reconstruction buffer 712 reconstructs all the fragment packets as soon as they are received. After the reconfiguration processing, the data is transferred to the dedicated transfer header or transfer identifier storage processing unit 73, and thereafter, the storage processing and the storage method are applied.

  The division processing for the fragment packet input from the service device 5 and the service network 4 to the service providing platform device 3 is based on the division processing in the division processing unit 715.

  This fragment packet processing method is a processing method that realizes the same effect as the original split processing without identifying and managing the reconstructed packet, and provides the service from the service device 5 and the service network 4. The purpose is to provide unified processing that can flexibly cope with changes in the number of packets input to the platform device and the packet length.

  Next, an embodiment of packet input from the direction of the user terminal 6 in the tunnel transfer method to which a dedicated transfer header or transfer identifier is assigned will be described in detail with reference to each processing function of FIG. 3 and the packet processing flowchart of FIG. To do.

  First, when a user data packet is input from the terminal 6 to the service providing platform device 3 via the transfer node 21 (IP transfer network 1), the main line interface connection unit 76 connects the main line within the service providing platform device 3. The data is input to the processing unit 7 (11-1 in FIG. 4). In the main line processing unit 7, the fragment processing unit 71 first detects and identifies the fragment packet (11-2 in FIG. 4). When the fragment packet is input, the fragment processing unit 71 stores the fragment packet in the reconfiguration buffer 712. Is activated (11-3 in FIG. 4). After receiving all the fragment packets in the reconfiguration buffer, the reconfiguration processing is performed (11-4 in FIG. 4), and is transmitted to the header storage processing unit 73 (11-5 in FIG. 4). If no fragment packet is detected, the packet is transmitted to the header storage processing unit (11-5 in FIG. 4). Next, the header storage processing unit 73 performs packet header information fixing element analysis on a dedicated transfer header or transfer identifier of the tunnel transfer method packet (11-6 in FIG. 4), and the header fixing element of the corresponding user or the corresponding user flow is determined. The header management table 75 is searched to see if it has already been saved (11-7 in FIG. 4). If there is an entry as a result of the search (11-8 in FIG. 4), the response is not saved in the header management table and there is no entry from the header management table 75 as the search result (11-9 in FIG. 4). Only the header information fixed element is transmitted to the header management table 75 (11-10 in FIG. 4), and the analysis header information fixed element is stored in the header management table 75 (11-11 in FIG. 4). Thereafter, the dedicated transfer header or transfer identifier is removed, and the packet is transferred to the service devices 51 and 52 and the service network 4 (11-12 in FIG. 4).

  Next, the user packets after various kinds of service processing (11-13 in FIG. 4) in the service devices 51 and 52 and the service network 4 are input to the service providing platform device 3 again. Are input from the general-purpose processing connection unit 77 to the main line processing unit 7 (11-14 in FIG. 4). In the main line processing unit 7, for the return packets from the service devices 51 and 52 and the service network 4, the header addition processing unit 74 reads the header information fixed element of the header addition target packet into the header management table (11 in FIG. 4). -15). In response to the packet header information fixed element read, the header management table 75 responds with a read target packet header information fixed element (11-16 in FIG. 4). The header assignment processing unit 74 assigns a dedicated transfer header or transfer identifier (11-17 in FIG. 4) based on the packet header information fixed element obtained from the header management table 75, and then forwards the packet to the header calculation processing unit 72. (11-18 in FIG. 4). The header calculation processing unit 72 calculates and assigns an incomplete dedicated transfer header and an identification packet information variable element (11-19 in FIG. 4), and transfers them to the fragment processing unit 71 (11-20 in FIG. 4). For the return packets from the service devices 51 and 52 and the service network 4, the fragment processing unit 71 calculates the maximum packet transfer size (MTU) (11-21 in FIG. 4). After the MTU calculation processing, if the calculated value is larger than the maximum packet transfer size of the main transfer network (transfer nodes 21, 22), the dedicated transfer header or transfer is performed with the maximum packet transfer size of the main transfer network (transfer nodes 21, 22). Division processing is performed based on the identifier (11-22 in FIG. 4). If the calculated value is less than or equal to the maximum packet transfer size of the main transfer network (transfer nodes 21 and 22), the divided value is not divided and output to the main line interface connection unit 76 and output to the opposite transfer node 22.

  Next, an embodiment of packet input from the direction of the external network 8 in the tunnel transfer method to which a dedicated transfer header or transfer identifier is assigned will be described in detail with reference to each processing function of FIG. 3 and the packet processing flowchart of FIG. To do.

  First, a user data packet is sent from the terminal 6 (not shown in FIG. 1, but the terminal 6 also exists on the transfer node 22 side) to the service providing platform apparatus 3 via the transfer node 22 (IP transfer network 1). When input, it is input from the main line interface connection unit 76 to the main line processing unit 7 inside the service providing platform device 3 (12-1 in FIG. 5). In the main line processing unit 7, the fragment processing unit 71 first detects and identifies the fragment packet (12-2 in FIG. 5). When the fragment packet is input, it is stored in the reconfiguration buffer 712, and the reconfiguration processing timer is set. It starts (12-3 in FIG. 5). After receiving all the fragment packets in the reconfiguration buffer, the reconfiguration processing is performed (12-4 in FIG. 5), and is transmitted to the header storage processing unit 73 (12-5 in FIG. 5). If no fragment packet is detected, the packet is transmitted to the header storage processing unit (12-5 in FIG. 5). Next, the header storage processing unit 73 performs packet header information fixing element analysis on a dedicated transfer header or transfer identifier of the tunnel transfer method packet (12-6 in FIG. 5), and the header fixing element of the corresponding user or the corresponding user flow is determined. The header management table 75 is searched to determine whether it has already been saved (12-7 in FIG. 5). If there is an entry as a result of the search (12-8 in FIG. 5), the response is not stored in the header management table and there is no entry from the header management table 75 as the search result (12-9 in FIG. 5). Only the information fixed element is transmitted to the header management table 75 (12-10 in FIG. 5), and the analysis header information fixed element is stored in the header management table 75 (12-11 in FIG. 5). Thereafter, the dedicated transfer header or transfer identifier is removed, and the packet is transferred to the service devices 51 and 52 and the service network 4 (12-12 in FIG. 5).

  Next, the user packets after various kinds of service processing (12-13 in FIG. 5) in the service devices 51 and 52 and the service network 4 are input to the service providing platform device 3 again. Are input from the general-purpose processing connection unit 77 to the main line processing unit 7 (12-14 in FIG. 5). In the main line processing unit 7, for the return packets from the service devices 51 and 52 and the service network 4, the header addition processing unit 74 reads the header information fixed element of the header addition target packet into the header management table (FIG. 5). 12-15). In response to reading of the packet header information fixed element, the header management table 75 responds with a read target packet header information fixed element (12-16 in FIG. 5). Based on the packet header information fixed element obtained from the header management table 75, the header assignment processing unit 74 assigns a dedicated transfer header or transfer identifier (12-17 in FIG. 5), and then forwards the packet to the header calculation processing unit 72. (12-18 in FIG. 5). The header calculation processing unit 72 calculates and assigns an incomplete dedicated transfer header and an identification packet information variable element (12-19 in FIG. 5) and transfers them to the fragment processing unit 71 (12-20 in FIG. 5). For the return packets from the service devices 51 and 52 and the service network 4, the fragment processing unit 71 calculates the maximum packet transfer size (MTU) (12-21 in FIG. 5). After the MTU calculation processing, if the calculated value is larger than the maximum packet transfer size of the main transfer network (transfer nodes 21, 22), the dedicated transfer header or transfer is performed with the maximum packet transfer size of the main transfer network (transfer nodes 21, 22). Division processing is performed based on the identifier (12-22 in FIG. 5). If the calculated value is less than or equal to the maximum packet transfer size of the main transfer network (transfer nodes 21 and 22), the divided value is not divided and output to the main line interface connection unit 76 and output to the opposite transfer node 21.

  Next, in the tunnel transfer method to which a dedicated transfer header or transfer identifier is assigned, the system configuration diagram of FIG. 1 and each of FIG. This will be described in detail using the processing function and the packet processing flowchart of FIG.

  First, a network connection authentication packet from a user terminal 6 (not shown in the figure, but there is also a terminal 6 on the forwarding node 22 side) is transmitted to the service providing platform device 3 via the forwarding node 21 (IP forwarding network 1). The forwarding node 21 (referred to as a tunnel setting device) establishes a tunnel (session) for the tunnel forwarding method with respect to the forwarding node 22 (referred to as a tunnel setting device). At this time, the service providing platform device 3 can store the packet header information fixed element that does not change for each user communication flow after the establishment from the control packet after the tunnel (session) establishment.

  Therefore, when a tunnel control packet accompanying the network connection authentication of the user terminal 6 is input from the forwarding node 21 to the service providing platform device 3, the main line interface connecting unit 76 to the main line processing unit 7 inside the service providing platform device 3. (13-2 in FIG. 6). In the main line processing unit 7, the fragment processing unit 71 first detects and identifies the fragment packet (13-3 in FIG. 6). When the fragment packet is input, the fragment processing unit 71 stores the fragment packet in the reconfiguration buffer 712. Is activated (13-4 in FIG. 6). After all the fragment packets are received in the reconfiguration buffer 712, reconfiguration processing is performed (13-5 in FIG. 6) and transmitted to the header storage processing unit 73 (13-6 in FIG. 6). If no fragment packet is detected (13-3 in FIG. 6), the packet is transmitted to the header storage processing unit 73 (13-6 in FIG. 6). Here, although this process considers that the tunnel control packet is fragmented, it is also possible to bypass this process if it is not fragmented. Next, the header storage processing unit 73 performs packet header information fixing element analysis on the dedicated transfer header and transfer identifier of the tunnel transfer method packet (13-7 in FIG. 6), and the header fixing element of the user or the user flow is determined. The header management table 75 is searched to determine whether it has already been saved (13-8 in FIG. 6). If there is an entry as a result of the search (13-9 in FIG. 6), the response is not saved in the header management table and there is no entry from the header management table 75 as the search result (13-10 in FIG. 6). Only the header information fixed element is transmitted to the header management table 75 (13-11 in FIG. 6) and stored (13-12 in FIG. 6) without transferring the tunnel control packet to the service devices 51 and 52 and the service network 4 To the main transfer network or transfer node 22. In the subsequent data communication phase, the dedicated transfer header and transfer identifier storage process of the tunnel transfer system packet is not performed, and the addition process is based on 11-12 in FIG. 4 or 12-12 in FIG.

  At present, Internet services using various IP transfer methods are prevailing. However, as a new approach for popularizing additional services, this embodiment is a high-performance service providing platform device that realizes the provision of network-based additional services. High performance. According to the present embodiment, it is considered that the demand for a telecommunications company and a corporate network is very high as a network-based value-added tunneling transfer service support platform device that does not depend on the application destination IP transfer network.

  Part or all of the service providing platform device and the service device of the above embodiment can be configured by a computer and a program.

  As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is a system configuration schematic diagram of an embodiment of the present invention. It is an apparatus structure schematic diagram of the Example of this invention. It is a figure which shows the main line functional block of the Example of this invention. It is a figure which shows the packet header preservation | save provision process flow from the terminal direction of the Example of this invention. It is a figure which shows the packet header preservation | save provision process flow from the external network direction of the Example of this invention. It is a figure which shows the packet processing flow of the Example preserve | saved in cooperation with the tunnel setting authentication of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... IP transfer network, 21, 22 ... Transfer node, 3 ... Tunneling transfer system corresponding service provision platform apparatus, 4 ... Service network, 5 ... Service apparatus, 6 ... (user) terminal, 7 ... Tunneling transfer system corresponding service provision platform Main line processing unit of apparatus, 71 ... Fragment processing unit of main line processing unit, 72 ... Header calculation processing unit of main line processing unit, 73 ... Header storage processing unit of main line processing unit, 74 ... Header of main line processing unit Grant processing unit, 75 ... header management table of main line processing unit, 76 ... main line interface connection unit of main line processing unit, 77 ... general-purpose processing connection unit of main line processing unit, 711 ... fragment detection processing unit of fragment processing unit 712: Fragment processing unit reconfiguration buffer, 713: Fragment processing unit reconfiguration timer, 714: Fragment MTU calculation processing unit of the bets processor, 715 ... division processing unit of the fragment processing unit, 8 ... external network

Claims (11)

A service providing platform device installed between a plurality of transfer nodes in a main transfer network for transferring a packet by assigning a dedicated transfer header or transfer identifier to the packet,
Means for connecting, via a service network, one or more service devices that perform service processing;
Means for storing the dedicated transfer header or transfer identifier of a user data packet input from the main transfer network;
Means for removing the dedicated transfer header or transfer identifier from the user data packet input from the main transfer network and transferring the packet to the service device via the service network;
Means for assigning the stored dedicated transfer header or transfer identifier to a packet input from the service device via the service network;
Means for outputting a packet with the dedicated transfer header or transfer identifier to a main transfer network for a destination user terminal;
A service providing platform device comprising: Means for storing only the packet header information fixed element that does not change the dedicated transfer header or transfer identifier information for each user communication flow;
Means for managing the packet header information fixed element in a table;
The service providing platform apparatus according to claim 1, further comprising: Means for storing only the packet header information fixed element that does not change for each user communication flow with the dedicated transfer header or transfer identifier information is means for storing in cooperation with tunnel setting authentication accompanying user network connection authentication, or user communication flow 3. The service providing platform device according to claim 2, further comprising means for storing only the first packet as a storage target. A dedicated transfer header or transfer identifier is assigned to a packet input from the service device via the service network based on the packet header information fixed element stored by means for managing the packet header information fixed element in a table. Means,
Means for outputting a packet with the dedicated transfer header or transfer identifier to a main transfer network for a destination user terminal;
Service Platform system according to claim 2 or 3, wherein the having. A dedicated transfer header or transfer identifier is assigned to a packet input from the service device via the service network based on the packet header information fixed element stored by means for managing the packet header information fixed element in a table. Means
Means for identifying packets for each user communication flow;
The packet header information fixed element for the user communication flow to be added is stored from the stored header information in which the packet header information fixed element that does not change for each user communication flow is managed in a table by means for managing the packet header information fixed element in a table. Means to search and grant;
The service providing platform apparatus according to claim 4, further comprising: After assigning a dedicated transfer header or transfer identifier to a packet input from the service device via the service network, a packet header information variable element including a header length and a packet length is calculated and attached to each assigned header. claim 1, 4 or 5 the service delivery platform device as claimed, that features that it has means. The maximum in the main transfer network in which a dedicated transfer header or transfer identifier is used when output packets to the main transfer network are output and transferred to the transfer network to which the dedicated transfer header or transfer identifier is assigned. claim 1, 4, 5 or 6 service platform device according, characterized in that it comprises means for calculating a transfer or packet size is a packet in size. A main transfer network in which a dedicated transfer header or transfer identifier is used when the packet size obtained by the packet size calculation means is output and transferred to the main transfer network with respect to the output packet from the platform to the transfer network. If it is larger than the maximum transfer packet size, datagram division processing is performed in the lower IP header of the user IP packet at the maximum transfer size, and if it is smaller than the maximum transfer packet size, it is unprocessed and sent to the main transfer network for the destination user terminal 8. The service providing platform apparatus according to claim 7, further comprising means for outputting. For a fragment packet that has been subjected to a datagram segmentation process at a lower IP of a user packet input from the transfer network to which the dedicated transfer header or transfer identifier is used to the platform device, the fragment packet is stored in the fragment IP header information. Means for detecting from identifier information and flag information and offset information;
Means for allocating a reconfiguration buffer area for reconfiguration based on identifier information of the fragment IP header information after detecting the fragment packet;
Means for simultaneously starting a timer for releasing the buffer area after a certain period of time;
Means for reconfiguring the buffer upon receipt of all the fragment packets from the main transport network to the platform device;
Means for transferring to the means for storing the dedicated transfer header or transfer identifier after the reconfiguration process;
Service Platform according to claim 1, 2 or 3, characterized in that it comprises a. A division process for a packet input from the service device via a service network without identifying and managing the reconstructed packet according to claim 9 depends on the division process according to claim 8. Service providing platform device. Service Platform system according to any one of claims 1-10 transfer system of the main transfer network, characterized in that the label transfer method or tunneling transfer method.

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