JP2009005256A - Communication control system and communication control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication control device 20 capable of providing a higher-speed communication environment to a user. <P>SOLUTION: The communication control device 20 holds predicted values of communication speeds achieved by respective LNSs (L2TP Network Server) 13 in communicating through the LNSs 13 as a database. Upon a connection request from a computer 11 of the user, the LNS 13 with the highest predicted value of the communication speed is selected as a route destination of a communication channel allocated to the user. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, one LNS is selected from a plurality of LNS (L2TP Network Server) in response to a request from a user, and communication for the user is performed between the LAC (L2TP Access Concentrator) and the selected LNS. It relates to the technology to establish a road.

  As a form for providing a connection environment to the Internet for users, an LAC is arranged in an access IP network, and an LNS managed by the ISP is arranged between the access IP network and an IP network provided by each ISP, The LAC that accepts the connection request from the user authenticates the user, identifies the ISP to which the user is subscribed, establishes a communication path with the LNS managed by the ISP, and passes through the communication path. There is a form in which a user's computer is connected to the Internet. Each ISP typically manages multiple LNSs to support many users connecting to the Internet.

  Here, if the LNS selected as the communication path is concentrated on one unit, the processing capability of the LNS becomes a bottleneck, and a communication environment with a sufficient communication speed may not be provided to the user. In order to avoid this, in Patent Document 1, information indicating the load status of each LNS is periodically collected, and when there is a connection request from the user, one LNS that can be assigned to the user is selected. When the load status of the selected LNS is equal to or less than a predetermined threshold value, a communication path is formed with the selected LNS.

JP 2005-228036 A

  The technology of Patent Document 1 can avoid establishing a new communication path with an LNS having a high load status, but if the load status of the selected LNS is less than or equal to a threshold value, the load is much lower than that of the selected LNS. Even if the LNS exists, a communication path is established with the selected LNS. If the load status of the selected LNS is close to the threshold value, the communication speed when communicating via the newly established communication path is via the communication path established between the LNS with a much lower load situation. The communication speed may be lower than the communication speed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a user with a higher-speed communication environment.

  In order to solve the above-described problem, in the present invention, for each LNS, an expected value of a communication speed realized when communicating via the LNS is held as a database, and when a connection request is received from a user. The LNS with the highest predicted communication speed is selected as the destination of the communication path assigned to the user.

  For example, in the first aspect of the present invention, one LNS is selected from a plurality of LNS (L2TP Network Server) in response to a request from the user, and the LAC (L2TP Access Concentrator) and the selected LNS A communication control system for establishing a communication path for the user in between, comprising a communication control device and a LAC, and the LAC accepts a connection request including a user ID for identifying the user from the user's computer. When the connection request accepting means for sending the connection request to the communication control device and the LNS designation information including the LNS_ID for identifying the LNS and the user ID are received from the communication control device, the user is connected to the LNS corresponding to the LNS_ID. A communication path establishment unit that establishes a communication path for a user corresponding to the ID, and the communication control device performs the LAC and the LNS for each LNS_ID. When a communication path is established with the LNS corresponding to the _ID, a connection request is received from the communication speed information storage means for storing the predicted value of the communication speed realized in the communication via the communication path and the LAC In this case, referring to the communication speed information storage means, the LNS_ID extraction means for extracting the LNS_ID of the LNS having the highest predicted communication speed, the LNS_ID extracted by the LNS_ID extraction means and the LNS_ID are triggered. There is provided a communication control system characterized by comprising specification information transmitting means for transmitting LNS specification information including a user ID included in the connection request to the LAC.

  Further, according to the second aspect of the present invention, one LNS is selected from a plurality of LNS (L2TP Network Server) in response to a request from the user, and the LAC (L2TP Access Concentrator) and the selected LNS A communication control apparatus used in a communication control system that establishes a communication path for the user in between, for each LNS_ID that identifies each LNS, a communication path is established between the LAC and the LNS corresponding to the LNS_ID If a connection request including a communication speed information storage means for storing an expected value of a communication speed realized in communication via the communication path and a user ID for identifying a user is received from the LAC, communication is performed. With reference to the speed information storage means, the LNS_ID extraction means for extracting the LNS_ID of the LNS with the highest predicted communication speed and the LNS_ID extraction means extract the LNS_ID. A communication control device comprising: LNS designation information including LNS_ID issued and LNS designation information including a user ID included in the connection request that triggered the extraction of the LNS_ID. provide.

  According to the present invention, a high-speed communication environment can be provided to the user.

  Embodiments of the present invention will be described below.

  FIG. 1 is a system configuration diagram showing an example of a configuration of a communication control system 10 according to an embodiment of the present invention. The communication control system 10 includes a communication control device 20 and a LAC 30.

  The LAC 30 is connected to an access IP network 12 such as a regional IP network, and communicates with a user's computer 11 via an access line such as an ADSL (Asymmetric Digital Subscriber Line) or a telephone line. Each LNS 13 is provided in the access IP network 12, establishes a communication path using L2TP (Layer 2 Tunneling Protocol) with the LAC 30, and transmits communication data to be transmitted / received via the established communication path to the ISP network 14. Relay to.

  Each ISP (Internet Services Provider) manages a plurality of LNSs 13, and a user's computer 11 that has signed a contract with the ISP is placed between the LAC 30 and one of the LNSs managed by the ISP. Connect to the Internet via an established communication path.

  When the user's computer 11 is requested to connect to the Internet, the communication control device 20 selects an LNS to be assigned to communication from among the LNSs managed by the ISP with which the user has a contract, and selects the selected LNS LAC is instructed to establish a communication path using L2TP. The communication control device 20 and the LAC 30 are connected via a communication line.

  In the present embodiment, a case where there is one LAC 30 in the communication control system 10 will be described as an example. However, as another form, a plurality of LACs 30 may exist in the communication control system 10. Also in this case, each LAC 30 establishes a communication path with the LNS 13 instructed from the communication control device 20.

  FIG. 2 is a block diagram illustrating an example of a functional configuration of the LAC 30. The LAC 30 includes a connection request reception unit 31, a communication path establishment unit 32, and a test data transmission / reception unit 33.

  When the connection request receiving unit 31 receives a connection request including a user ID for identifying a user and user authentication information (for example, password or biometric information) corresponding to the user ID from the user's computer 11, The received connection request is transmitted to the communication control device 20.

  When receiving the LNS designation information including the LNS_ID for identifying the LNS 13 and the user ID from the communication control device 20, the communication path establishment unit 32 communicates with the LNS 13 corresponding to the LNS_ID included in the received LNS designation information. Then, a user communication path corresponding to the user ID included in the received LNS designation information is established. The communication path establishment unit 32 holds address information (for example, an IP address) of the LNS for each LNS 13, and communicates with the LNS 13 specified by the LNS designation information based on the address information by L2TP. Establish a road.

  The test data transmission / reception unit 33 includes communication including LNS_ID, predetermined test data, and address information (for example, URL) of a Web server having a function of transmitting the received data to the transmission source of the data from the communication control device 20. When a speed measurement instruction is received, a communication path is established with the LNS 13 corresponding to the LNS_ID. Then, the test data transmission / reception unit 33 transmits the test data to the Web server via the established communication path, and records the time when transmission of the test data is started in the internal memory.

  Then, when the test data transmission / reception unit 33 receives the test data via the communication path established with the LNS 13 corresponding to the LNS_ID included in the communication speed measurement instruction, the test data transmission / reception unit 33 indicates the time when the reception of the test data has ended. Record in internal memory. Then, the test data transmission / reception unit 33 calculates the time taken from the start of transmission of the test data to the end of reception as the measurement time, and the measurement result including the calculated measurement time and the LNS_ID of the LNS 13 passed in the transmission / reception of the test data. Is transmitted to the communication control device 20.

  FIG. 3 is a block diagram illustrating an example of a functional configuration of the communication control device 20. The communication control device 20 includes an available LNS information storage unit 21, a communication speed information storage unit 22, a designation information transmission unit 23, an LNS_ID extraction unit 24, a communication speed measurement instruction unit 25, and a communication speed calculation unit 26.

  In the usable LNS information storage unit 21, for example, as shown in FIG. 4, for each user ID 210, user authentication information (for example, password or biometric information) 211 corresponding to the user ID 210, and corresponding to the user ID 210 The LNS_ID 212 of the LNS 13 managed by the ISP with which the user is contracting, that is, the LNS_ID 212 of the LNS 13 permitted to be used for communication by the user is stored.

  For example, as illustrated in FIG. 5, when a communication path is established between the LNS_ID 221 and the LAC 30 and the LNS 13 corresponding to the LNS_ID 221, the communication speed information storage unit 22 is realized in communication via the communication path. The communication speed 222 indicating the expected value of the communication speed, the Web site information 223 indicating the address information of the Web server having a function of transmitting the received data to the transmission source of the data, and the LNS 13 corresponding to the LNS_ID 221 establish the communication path. A selection number 224 indicating the number of times of selection as a target is stored in association with the number 220.

  The Web site information 223 preferably stores a URL (Uniform Resource Locator) of a Web site near the LNS 13 having the corresponding LNS_ID. For example, the Web site information 223 includes a URL of a Web server provided in an ISP that manages the LNS_ID of the corresponding LNS_ID and has a function of transmitting received data to the transmission source of the data. Is stored.

  When the connection request is received from the LAC 30, the LNS_ID extraction unit 24 extracts the authentication information associated with the user ID included in the received connection request from the available LNS information storage unit 21, and extracts the extracted authentication. By comparing the information with the authentication information included in the received connection request, the user who has transmitted the connection request is authenticated.

  When the authentication information extracted from the usable LNS information storage unit 21 matches the authentication information included in the received connection request, that is, when the authentication is successful, the LNS_ID extraction unit 24 is included in the received connection request. The LNS_ID of the LNS 13 that is allowed to be used by the user corresponding to the user ID that has been registered is extracted from the available LNS information storage unit 21. Then, the LNS_ID extraction unit 24 refers to the communication speed information storage unit 22 based on the extracted LNS_ID, and identifies the LNS_ID associated with the predicted value of the highest communication speed among the extracted LNS_IDs.

  When there are a plurality of LNS_IDs that are associated with the predicted value of the highest communication speed among the extracted LNS_IDs, the LNS_ID extraction unit 24 selects the LNS_ID with the smaller number of selections as the predicted value of the highest communication speed. It is specified as the associated LNS_ID. As a result, it is possible to disperse the risk that the device concentrates on the specific LNS 13 and deteriorates. Then, the LNS_ID extraction unit 24 notifies the specified information transmission unit 23 of the identified LNS_ID and the user ID included in the connection request that triggered the identification of the LNS_ID.

  When the LNS_ID extraction unit 24 is notified of the LNS_ID and the user ID, the designation information transmission unit 23 transmits LNS designation information including the LNS_ID and the user ID to the communication control device 20.

  The communication speed measurement instruction unit 25 refers to the communication speed information storage unit 22 at a predetermined timing (for example, every second), selects LNS_ID one by one in numerical order, selects the selected LNS_ID, predetermined test data, A communication speed measurement instruction including address information (for example, URL) of a Web server having a function of transmitting the received data to the data transmission source is transmitted to the LAC 30. In the present embodiment, the test data is data of a predetermined bit pattern having a data amount of 50 Mbits, for example. When the communication speed measurement instructing unit 25 selects all the LNS_IDs in the communication speed information storage unit 22, the communication speed measurement instructing unit 25 starts selecting the LNS_ID again in order from the first.

  When the communication speed calculation unit 26 receives the measurement result from the LAC 30, the communication speed calculation unit 26 divides the data amount of the test data (in this example, 50 Mbits) by the measurement time included in the measurement result, thereby obtaining an expected value of the communication speed. Is calculated. Then, the communication speed calculation unit 26 updates the predicted value of the communication speed stored in the communication speed information storage unit 22 in association with the LNS_ID included in the received measurement result with the calculated predicted value.

  FIG. 6 is a flowchart illustrating an example of the operation of the LAC 30. For example, the LAC 30 starts the operation shown in this flowchart at a predetermined timing such as when the power is turned on.

  First, the connection request receiving unit 31 determines whether or not a connection request has been received from the user's computer 11 (S100). When connection information is received (S100: Yes), the connection request reception part 31 transmits the received connection request to the communication control apparatus 20 (S101), and executes the process shown in step S100 again.

  If connection information has not been received (S100: No), the communication path establishment unit 32 determines whether or not LNS designation information has been received from the communication control device 20 (S102). When the LNS designation information is received (S102: Yes), the communication path establishment unit 32 sets the user ID included in the LNS designation information to the LNS 13 corresponding to the LNS_ID included in the received LNS designation information. A corresponding user communication path is established (S103), and the connection request receiving unit 31 executes the process shown in step S100 again.

  The procedure for establishing a communication path with the LNS 13 designated by the LNS designation information, the procedure for releasing the communication path established when communication is completed, and the like follow the communication procedure using normal L2TP. Detailed description here is omitted.

  When the LNS designation information is not received (S102: No), the test data transmission / reception unit 33 determines whether a communication speed measurement instruction is received from the communication control device 20 (S104). When the communication speed measurement instruction has not been received (S104: No), the connection request reception unit 31 executes the process shown in step S100 again.

  When the communication speed measurement instruction is received (S104: Yes), the test data transmission / reception unit 33 establishes a communication path with the LNS 13 corresponding to the LNS_ID included in the received communication speed measurement instruction, and establishes the established communication. The test data is transmitted to the Web server corresponding to the address information included in the received communication speed measurement instruction via the path (S105). Then, the test data transmitter / receiver 33 records the time when the test data is transmitted.

  Next, the test data transmission / reception unit 33 receives the test data via the communication path established in step S105 and records the reception time. Then, the test data transmission / reception unit 33 calculates, from the transmission time and the reception time, the time from when the test data is transmitted to when it is received as the measurement time, and the calculated measurement time and the LNS 13 through which the test data is transmitted / received A measurement result including the LNS_ID is created (S106). Then, the test data transmission / reception unit 33 transmits the created measurement result to the communication control device 20 (S107), and the connection request reception unit 31 executes the process shown in step S100 again.

  FIG. 7 is a flowchart illustrating an example of the operation of the communication control device 20. For example, the communication control device 20 starts the operation shown in this flowchart at a predetermined timing such as when the power is turned on. In the initial state, it is assumed that 0 is stored in the value indicating the number being selected that the communication speed measurement instruction unit 25 refers to. A value indicating the selected number is stored in the internal memory of the communication control device 20.

  First, the LNS_ID extraction unit 24 determines whether a connection request is received from the LAC 30 (S200). When the connection request is received (S200: Yes), the LNS_ID extraction unit 24 refers to the usable LNS information storage unit 21, and obtains authentication information associated with the user ID included in the received connection request. Extracted from the usable LNS information storage unit 21 (S201). Then, the LNS_ID extraction unit 24 determines whether or not the extracted authentication information matches the authentication information included in the received connection request (S202).

  When the extracted authentication information is different from the authentication information included in the received connection request (S202: No), the LNS_ID extraction unit 24 executes the process shown in step S200 again. Note that the LNS_ID extraction unit 24 sends an error notification indicating that the authentication has failed via the LAC 30 when the extracted authentication information is different from the authentication information included in the received connection request. May be transmitted to the computer 11 of the user of the transmission source.

  When the extracted authentication information matches the authentication information included in the received connection request (S202: Yes), the LNS_ID extraction unit 24 sends the user corresponding to the user ID included in the received connection request to the user. The LNS_ID of the LNS 13 that is permitted to be used is extracted from the available LNS information storage unit 21 (S203). Then, the LNS_ID extraction unit 24 refers to the communication speed information storage unit 22 based on the extracted LNS_ID, and extracts the LNS_ID associated with the predicted value of the highest communication speed from the extracted LNS_ID (S204). ).

  When there are a plurality of LNS_IDs that are associated with the predicted value of the highest communication speed among the extracted LNS_IDs, the LNS_ID extraction unit 24 selects the LNS_ID with the smaller number of selections as the predicted value of the highest communication speed. It is specified as the associated LNS_ID. Then, the LNS_ID extraction unit 24 notifies the specified information transmission unit 23 of the identified LNS_ID and the user ID included in the connection request that triggered the identification of the LNS_ID.

  Next, the designation information transmission unit 23 transmits the LNS designation information including the LNS_ID and the user ID notified from the LNS_ID extraction unit 24 to the communication control device 20 (S205). Then, the LNS_ID extraction unit 24 increases the number of selections stored in the communication speed information storage unit 22 in association with the LNS_ID notified to the designation information transmission unit 23 (S206), and the LNS_ID extraction unit 24 performs the step again. The process shown in S200 is executed.

  When the connection request has not been received (S200: No), the communication speed measurement instructing unit 25 determines whether it is the communication speed measurement timing (S207). When it is the communication speed measurement timing (S207: Yes), the communication speed measurement instruction unit 25 refers to the selected number and the communication speed information storage unit 22, and the next number is stored in the communication speed information storage unit 22. It is determined whether or not it exists (S208).

  When the next number exists (S209: Yes), the communication speed measurement instruction unit 25 selects the LNS_ID associated with the next number and stored in the communication speed information storage unit 22, and selects the selected LNS_ID and test. A speed measurement instruction including data and Web server address information is transmitted to the LAC 30 (S209). Then, the communication speed measurement instruction unit 25 increments the selected number by 1 (S211), and the LNS_ID extraction unit 24 executes the process shown in step S200 again.

  When the next number does not exist (S209: No), the communication speed measurement instruction unit 25 selects the LNS_ID associated with No. 1 and stored in the communication speed information storage unit 22, and selects the selected LNS_ID and test data. , And a speed measurement instruction including the address information of the Web server is transmitted to the LAC 30 (S210). Then, the communication speed measurement instruction unit 25 updates the selected number to 1 (S211), and the LNS_ID extraction unit 24 executes the process shown in step S200 again.

  When it is not the measurement timing of the communication speed (S207: No), the communication speed calculation unit 26 determines whether a measurement result is received from the LAC 30 (S212). When the measurement result is not received from the LAC 30 (S212: No), the LNS_ID extraction unit 24 executes the process shown in Step S200 again.

  When the measurement result is received from the LAC 30 (S212: Yes), the communication speed calculation unit 26 divides the amount of test data (in this example, 50 Mbits) by the measurement time included in the received measurement result. Calculate the expected value of the communication speed. The communication speed calculation unit 26 then updates the predicted value of the communication speed stored in the communication speed information storage unit 22 in association with the LNS_ID included in the received measurement result with the calculated predicted value ( S213), the LNS_ID extraction unit 24 executes the process shown in step S200 again.

  FIG. 8 is a hardware configuration diagram illustrating an example of a computer 50 that realizes the functions of the communication control device 20 or the LAC 30. The computer 50 includes a central processing unit (CPU) 51, a random access memory (RAM) 52, a read only memory (ROM) 53, a hard disk drive (HDD) 54, a communication interface (I / F) 55, an input / output interface (I). / F) 56 and media interface (I / F) 57.

  The CPU 51 operates based on a program stored in the ROM 53 or the HDD 54 and controls each unit. The ROM 53 stores a boot program executed by the CPU 51 when the computer 50 is started up, a program depending on the hardware of the computer 50, and the like.

  The HDD 54 stores a program executed by the CPU 51. The communication interface 55 receives data from other devices via a communication line and sends the data to the CPU 51, and transmits data generated by the CPU 51 to other devices via the communication line.

  The CPU 51 controls an output device such as a monitor and a printer and an input device such as a keyboard and a mouse via the input / output interface 56. The CPU 51 acquires data from the input device via the input / output interface 56. Further, the CPU 51 outputs the generated data to the output device via the input / output interface 56.

  The media interface 57 reads a program or data stored in the recording medium 58 and provides it to the RAM 52. A program provided to the CPU 51 via the RAM 52 is stored in the recording medium 58. The program is read from the recording medium 58, installed in the computer 50 via the RAM 52, and executed by the CPU 51. The recording medium 58 is, for example, an optical recording medium such as a DVD (Digital Versatile Disk) or PD (Phase change rewritable disk), a magneto-optical recording medium such as an MO (Magneto-Optical disk), a tape medium, a magnetic recording medium, or a semiconductor memory. Etc.

  When the computer 50 functions as the communication control device 20, a program installed and executed on the computer 50 includes the usable LNS information storage unit 21, the communication speed information storage unit 22, the designation information transmission unit 23, and the LNS_ID. It functions as an extraction unit 24, a communication speed measurement instruction unit 25, and a communication speed calculation unit 26.

  When the computer 50 functions as the LAC 30, a program installed and executed on the computer 50 causes the computer 50 to function as the connection request accepting unit 31, the communication path establishing unit 32, and the test data transmitting / receiving unit 33.

  The computer 50 reads these programs from the recording medium 58 and executes them, but as another example, these programs may be acquired from other devices via a communication medium. The communication medium refers to a communication line or a digital signal or a carrier wave that propagates through the communication line.

  The embodiment of the present invention has been described above.

  As is clear from the above description, according to the communication control system 10 of the present embodiment, a high-speed communication environment can be provided to the user.

  In addition, this invention is not limited to above-described embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above-described embodiment, the communication control device 20 selects the LNS 13 to be established as a communication path from the ISP LNS 13 with which the user who requested the connection has contracted. When receiving a connection request from the user's computer 11, the control device 20 sets all the LNSs 13 in the access IP network 12 as the communication path establishment target LNSs 13, and among them, the LNS 13 having the highest predicted value of the communication speed. May be specified, and the LAC 30 may be instructed to establish a communication path with the specified LNS 13.

  In this case, since the selection range of the LNS 13 is expanded, the number of communication paths established between one LNS 13 and the LAC 30 can be reduced, and a higher-speed communication environment can be provided. This can also be realized by each user signing a contract with a plurality of ISPs.

  In the above-described embodiment, the communication control device 20 and the LAC 30 are configured as separate devices. However, as another mode, the communication control device 20 and the LAC 30 may be configured as one device.

1 is a system configuration diagram illustrating an example of a configuration of a communication control system 10 according to an embodiment of the present invention. 2 is a block diagram illustrating an example of a functional configuration of a LAC 30. FIG. 3 is a block diagram illustrating an example of a functional configuration of a communication control device 20. FIG. It is a figure which shows an example of the data structure stored in the usable LNS information storage part. It is a figure which shows an example of the data structure stored in the communication speed information storage part. 3 is a flowchart showing an example of the operation of the LAC 30. 4 is a flowchart illustrating an example of the operation of the communication control device 20. 2 is a hardware configuration diagram illustrating an example of a computer 50 that realizes the functions of the communication control device 20 or the LAC 30. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Communication control system, 11 ... Computer, 12 ... Access IP network, 13 ... LNS, 14 ... ISP network, 20 ... Communication control apparatus, 21 ... Usable LNS Information storage unit 210 ... User ID 211 ... Authentication information 212 ... LNS_ID 22 ... Communication speed information storage unit 220 ... No. 221 ... LNS_ID 222 ... Communication speed, 223 ... Web site information, 224 ... number of selections, 23 ... designated information transmission unit, 24 ... LNS_ID extraction unit, 25 ... communication speed measurement instruction unit, 26 ... communication Speed calculation unit, 30 ... LAC, 31 ... connection request reception unit, 32 ... communication path establishment unit, 33 ... test data transmission / reception unit, 50 ... computer, 51 ... CPU, 52 ... RAM, 3 ... ROM, 54 ... HDD, 55 ... communication interface, 56 ... input-output interface, 57 ... medium interface 58 ... recording medium

Claims (5)

In response to a request from a user, one LNS is selected from a plurality of LNS (L2TP Network Servers), and a communication path for the user is established between the LAC (L2TP Access Concentrator) and the selected LNS. A communication control system,
A communication control device;
With LAC,
The LAC is
A connection request accepting means for accepting a connection request including a user ID for identifying a user from the user's computer and sending the accepted connection request to the communication control device;
Communication that establishes a communication path for a user corresponding to the user ID with the LNS corresponding to the LNS_ID when the LNS designation information including the LNS_ID for identifying the LNS and the user ID is received from the communication control device Road establishment means,
The communication control device includes:
Communication speed information storage means for storing, for each LNS_ID, a predicted value of a communication speed realized in communication via the communication path when a communication path is established between the LAC and the LNS corresponding to the LNS_ID; ,
LNS_ID extraction means for extracting the LNS_ID of the LNS having the highest expected communication speed with reference to the communication speed information storage means when receiving a connection request from the LAC;
A LNS_ID extracted by the LNS_ID extraction means and a LNS designation information including a user ID included in a connection request that triggered the extraction of the LNS_ID. Communication control system. The communication control system according to claim 1,
The communication control device includes:
For each user ID, there is further usable LNS information storage means for storing the LNS_ID of the LNS that is allowed to be used for communication by the user corresponding to the user ID,
The LNS_ID extraction means
When a connection request is received from the LAC, the user who has transmitted the connection request is authenticated, and when the authentication is successful, the user can use the communication for communication by referring to the usable LNS information storage unit. A communication control system that extracts an LNS_ID of an LNS having a highest predicted communication speed from among permitted LNSs. The communication control system according to claim 1 or 2,
The LAC is
When receiving a communication speed measurement instruction including the LNS_ID, predetermined test data, and address information of a Web server having a function of transmitting the received data to the transmission source of the data from the communication control device, the LNS_ID When a communication path is established with the LNS corresponding to, the test data is transmitted to the Web server via the established communication path, and the test data is received via the communication path, the test data A test data transmission / reception means for transmitting a measurement result including the time taken from the start of transmission to the end of reception and the LNS_ID of the LNS passed in the transmission / reception of the test data to the communication control device;
The communication control device includes:
For each LNS_ID stored in the communication speed information storage means, a communication speed measurement instruction means for sending a communication speed measurement instruction including the LNS_ID to the LAC;
When the measurement result is received from the LAC, the communication speed is estimated by dividing the data amount of the test data by the time taken from the start of transmission of the test data to the end of reception included in the received measurement result. A communication control system further comprising: a communication speed calculation unit that calculates a value and stores the calculated predicted value in the communication speed information storage unit in association with the LNS_ID included in the measurement result. The communication control system according to any one of claims 1 to 3,
The communication speed information storage means further stores, for each LNS_ID, the number of establishment times indicating the number of times a communication path has been established between the LAC and the LNS corresponding to the LNS_ID,
The LNS_ID extraction means
When there are a plurality of LNSs having the highest predicted communication speed, the LNS_ID of the LNS with the smallest number of establishments is extracted from these LNSs. In response to a request from a user, one LNS is selected from a plurality of LNS (L2TP Network Servers), and a communication path for the user is established between the LAC (L2TP Access Concentrator) and the selected LNS. A communication control device used in a communication control system,
For each LNS_ID for identifying each LNS, when a communication path is established between the LAC and the LNS corresponding to the LNS_ID, an expected value of a communication speed realized in communication via the communication path is stored. Communication speed information storage means;
LNS_ID extracting means for extracting the LNS_ID of the LNS with the highest expected communication speed with reference to the communication speed information storage means when receiving a connection request including a user ID for identifying the user from the LAC;
And a LNS_ID extracted by the LNS_ID extraction means and a LNS designation information including a user ID included in a connection request that triggered the extraction of the LNS_ID. Communication control device.

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