JP5043815B2 - Communication system, server, response transmission control method, and response transmission control program - Google Patents

Description

  The present invention relates to a communication system, a server, a response transmission control method, and a response transmission control program.

  Conventionally, by using a communication protocol typified by DHCP (Dynamic Host Configuration Protocol), a plurality of related request and response pairs are exchanged between the client and the server. There is a technology that provides a service for issuing information for IP communication such as an IP address and a subnet mask.

  Hereinafter, with reference to FIG. 11, a brief description will be given of an exchange when DHCP is applied to a communication system including a client and a server. The DHCP client, for example, sends a “Discover signal” including a unique client ID to the client at power-on timing, and requests information (IP setting information) necessary for IP communication such as an IP address and a subnet mask. (See (1) in the figure).

  When the DHCP server receives the “Discover signal” from the DHCP client, the DHCP server determines a candidate IP setting information that can be paid out in accordance with the client ID included in the “Discover signal”, and includes the “Offer signal including the determined IP setting information candidate. "(See (2) of FIG. 11). When the DHCP server accepts the “Offer signal” from the DHCP client, the DHCP server checks the IP setting information candidate included in the “Offer signal”, and sends a “Request signal” to the DHCP server if it can be accepted. A request for securing the setting information is made (see (3) in the figure).

  When the DHCP server receives the “Request signal” from the DHCP client, the DHCP server definitely secures the IP setting information candidate notified to the DHCP client as IP setting information to be paid out to the DHCP client. Then, an “Ack signal” including IP setting information that is definitely secured is sent to the DHCP client, and final notification of the IP setting information is performed (see (4) in FIG. 11). In addition, FIG. 11 is a figure for demonstrating a prior art.

  As described above, when DHCP is applied to a communication system composed of a client and a server, a “Discover signal and Offer signal” and a “Request signal and Ack signal” are called between the client and the server. Two types of request-response pairs are exchanged. Thus, in a communication system in which a plurality of request and response pairs are exchanged between a client and a server, when the server accommodates a plurality of clients, the server receives the requests from the clients all at once. If the server falls into a congestion state, the processing capacity of the server decreases. As a result, the time required for exchanging a plurality of request and response pairs between the client and the server increases, and the service cannot be provided quickly.

  For example, in Japanese Patent Application Laid-Open No. 2004-260628, a server provides a service quickly by sending a list of MAC address and IP address pairs to all clients when congestion is detected. Techniques to do this have been proposed.

JP 2002-232447 A

  However, the technique proposed in Patent Document 1 described above can be applied when the IP address to be paid out to all the clients is fixed, but when the IP address is dynamically given according to a request from the client. There was a problem that was not applicable.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and even when the IP address is dynamically paid out in a communication system composed of a client and a server, It is an object of the present invention to provide a communication system, a server, a communication method, and a communication program capable of providing a quick service to a client by efficiently using processing capacity.

  In order to solve the above-described problems and achieve the object, the present invention provides a series of processes in which each client device sends a request signal to the server, and the server returns a response signal to the request signal to the client device. In the communication system that provides a service to the client device by completing the process, the server controls the transmission of the response signal to be delayed even when the response signal can be transmitted. Response sending control means is provided.

  ADVANTAGE OF THE INVENTION According to this invention, a quick service can be provided to a client efficiently using the server side processing capacity.

  Exemplary embodiments of a communication system, a server, a communication method, and a communication program according to the present invention will be explained below in detail with reference to the accompanying drawings. In the following first embodiment, the outline and features of the server according to the first embodiment, the configuration and processing of the server will be described in order, and the effects of the first embodiment will be described.

[Outline and Features of Server (Example 1)]
First, the outline and features of the server according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the outline and features of the server according to the first embodiment.

  As shown in the figure, the server according to the first embodiment accommodates a plurality of client terminals (1) to (10), receives a request signal from the client terminal, and performs a process of returning a response signal to the request signal. The outline is to provide a service (communication service using an IP address or the like) to a client device by completing a series of processes in units.

  The server according to the first embodiment is mainly characterized in that control is performed so as to delay transmission of the response signal even when the response signal can be transmitted. With this feature, it is possible to provide a quick service to the client by efficiently using the processing capacity on the server side.

  Hereinafter, the main features will be specifically described. As shown in FIG. 1, each client terminal is activated all at once, and for example, a “Discover signal” that is a request signal is sent to the server at intervals of 0.1 seconds, and is necessary for IP communication such as an IP address and a subnet mask. Request information (IP setting information) candidates.

  The server according to the first embodiment sequentially processes the “Discover signal” received from each client terminal, and even after the “Offer signal” generated as a response signal is ready to be sent, it is delayed by 2 seconds. Return to each client terminal.

  Upon receipt of the “Offer signal” from the server, each client terminal confirms the IP setting information candidate included in the “Offer signal” and immediately sends a “Request signal” to the DHCP server if it can be accepted. Request to secure IP setting information.

  The server according to the first embodiment sequentially processes the “Request signal” received from each client terminal, and even after the “Ack signal” generated as a response signal is ready to be sent, it is delayed by 2 seconds. Return to each client terminal.

  Upon receiving the “Ack signal” from the server, each client terminal sets the reserved IP setting information included in the “Ack signal” in its network interface, and starts using the communication service.

  For this reason, the server according to the first embodiment controls the transmission of the response signal to be delayed even when the response signal can be transmitted, as in the main feature described above. Suppresses the server from becoming congested due to the response triggering further requests from the client terminal. As a result of suppressing the server from falling into a congested state, it is possible to efficiently use the processing capability on the server side and provide a quick service to the client.

[Configuration of Server (Example 1)]
Next, the configuration of the server according to the first embodiment will be described with reference to FIG. FIG. 2 is a diagram illustrating the configuration of the server according to the first embodiment. As shown in the figure, the server 100 according to the first embodiment includes a request signal reception function unit 110, a reception buffer 120, a request signal processing function unit 130, a transmission buffer 140, and a response signal transmission control function unit 150. Have

  The request signal reception function unit 110 receives request signals such as “Discover signal” and “Request signal” from the client terminal accommodated in the server 100. Specifically, when receiving a request signal from the client terminal, the request signal reception function unit 110 acquires the current time as the signal reception time, and accumulates the received signal data in the reception buffer 120 together with the acquired reception time. Wait in the signal reception waiting state.

  The reception buffer 120 holds the reception signal data and reception time accumulated by the request signal reception function unit 110. For example, during the signal processing by the request signal processing function unit 130, the new request signal data received by the request signal reception function unit 110 from the client terminal can be held.

  The request signal processing function unit 130 processes the request signal received from the client terminal by the request signal reception function unit 110 and creates a response signal. More specifically, the request signal processing function unit 130 tries to acquire a reception signal and a reception time from the reception buffer 120. When the reception signal and the reception time can be acquired, it is confirmed whether or not the type of the reception signal is “Request signal”. As a result of the confirmation, if it is a “Request signal”, IP setting information such as an IP address and a subnet mask that has already been determined after receiving a “Discover signal” associated with this “Request signal” is acquired and acquired. An “Ack signal” is generated based on the IP setting information. Then, the generated “Ack signal” is accumulated in the transmission buffer 140 together with the reception time acquired from the reception buffer 120. Then, the request signal processing function unit 130 tries to acquire the next reception signal from the reception buffer 120.

  On the other hand, the request signal processing function unit 130 confirms whether the type of the received signal acquired from the reception buffer 120 is “Request signal”, and if it is not “Request signal”, it is “Discover signal”. Check whether or not. As a result of the confirmation, if it is a “Discover signal”, the IP setting information of the payout candidate is determined according to the client terminal that is the transmission source of the “Discover signal”. After determining the IP setting information of the payout candidate, the request signal processing function unit 130 generates an “Offer signal” based on the IP setting information determined as the payout candidate. Then, the generated “Offer signal” is accumulated in the transmission buffer 140 together with the reception time acquired from the reception buffer 120. Then, the request signal processing function unit 130 tries to acquire the next reception signal from the reception buffer 120.

  Note that the IP setting information is determined by storing IP setting information in association with a client ID in a DB or the like provided in advance in the server, and using the IP setting information associated with the client ID as a payout candidate. You may employ | adopt the method to determine. Alternatively, a method is adopted in which a plurality of IP setting information that can be paid out is stored together with the payout status in a DB or the like provided in advance in the server, and determined as a payout candidate from IP setting information that has not been paid out yet. Also good.

  Further, as a result of checking whether or not the type of the received signal acquired from the receiving buffer 120 is “Discover signal”, the request signal processing function unit 130 regards it as an illegal signal if it is not “Discover signal”. Discard the signal and try to acquire the next received signal from the reception buffer 120.

  The transmission buffer 140 holds the response signal data and the reception time accumulated by the request signal processing function unit 130 until it is time to send the response signal.

  Even if the response signal transmission control function unit 150 is ready to transmit the response signal, the response signal transmission control function unit 150 performs control so as to delay the transmission of the response signal until the response signal is transmitted. More specifically, the response signal transmission control function unit 150 attempts to acquire the response signal and the reception time from the transmission buffer 140. When the response signal and the reception time can be acquired, the current time is acquired, and it is determined whether or not the acquired current time has passed 2 seconds or more from the reception time. If two seconds or more have passed as a result of the determination, the response signal acquired from the transmission buffer 140 is returned to the client terminal on the assumption that the response signal transmission timing has been reached. Then, the response signal transmission control function unit 150 tries to acquire the next response signal from the transmission buffer 140.

  On the other hand, as a result of determining whether or not the current time has passed 2 seconds or more from the reception time, the response signal transmission control function unit 150 sends the response signal and the reception time to the transmission buffer if it has not passed 2 seconds or more. Return to the original position of 140. Then, the response signal transmission control function unit 150 tries to acquire the next response signal from the transmission buffer 140. The response signal transmission control function unit 150 corresponds to “response transmission control means” recited in the claims.

[Processing by Server (Example 1)]
Subsequently, the flow of processing performed by the server according to the first embodiment will be described with reference to FIGS. 3 to 5 are diagrams illustrating a flow of processing by the server according to the first embodiment.

[Request signal reception processing]
First, the flow of request signal reception processing will be described with reference to FIG. As shown in the figure, the request signal reception function unit 110 waits in a reception waiting state for a request signal transmitted from the client terminal (step S1), and when receiving the request signal (step S1 affirmative), signals the current time. Is acquired as a reception time (step S2). Then, the request signal reception function unit 110 accumulates the reception signal data together with the acquired reception time in the reception buffer 120 (step S3), and returns to the signal reception waiting state again.

[Request signal processing]
Next, the flow of request signal processing will be described with reference to FIG. As shown in the figure, the request signal processing function unit 130 tries to acquire the reception signal and the reception time from the reception buffer 120 (step S1). When the reception signal and the reception time can be acquired (Yes at Step S1), it is confirmed whether or not the type of the reception signal is “Request signal” (Step S2).

  If the result of the confirmation is “Request signal” (Yes at Step S2), the request signal processing function unit 130 has already determined the IP address after receiving the “Discover signal” associated with this “Request signal”. And IP setting information such as a subnet mask is acquired (step S3), and an “Ack signal” is generated based on the acquired IP setting information (step S4). Then, together with the reception time acquired from the reception buffer 120, the generated “Ack signal” is accumulated in the transmission buffer 140 (step S5). Then, the request signal processing function unit 130 returns to step S <b> 1 described above and tries to acquire the next reception signal from the reception buffer 120.

  Here, returning to the description of step S <b> 2, the request signal processing function unit 130 confirms whether or not the type of the received signal acquired from the receiving buffer 120 is “Request signal”, and is not “Request signal”. (No in step S2), it is confirmed whether or not it is a “Discover signal” (step S6). As a result of the confirmation, if it is “Discover signal” (Yes at Step S6), the IP setting information of the payout candidate is determined according to the client terminal that is the transmission source of “Discover signal” (Step S7). After determining the IP setting information of the payout candidate, the request signal processing function unit 130 generates an “Offer signal” based on the IP setting information determined as the payout candidate (step S8). Then, together with the reception time acquired from the reception buffer 120, the generated “Offer signal” is accumulated in the transmission buffer 140 (step S9). Then, the request signal processing function unit 130 returns to step S <b> 1 described above, and tries to acquire the next reception signal from the reception buffer 120.

  Here, returning to the description of step S6, the request signal processing function unit 130 confirms whether or not the type of the received signal acquired from the reception buffer 120 is “Discover signal”, and as a result, it is not “Discover signal”. In this case (No in step S6), the signal is regarded as an illegal signal, the signal is discarded, and the process returns to the above-described step S1 to try to acquire the next reception signal from the reception buffer 120.

[Response signal transmission control processing]
Next, the flow of response signal transmission control processing will be described with reference to FIG. As shown in the figure, the response signal transmission control function unit 150 tries to acquire the response signal and the reception time from the transmission buffer 140 (step S1). If the response signal and the reception time can be acquired (Yes at Step S1), the current time is acquired (Step S2), and it is determined whether or not the acquired current time has passed 2 seconds or more from the reception time. (Step S3). If two seconds or more have passed as a result of the determination (Yes at Step S3), the response signal acquired from the transmission buffer 140 is transmitted to the client terminal as having arrived at the response signal transmission timing (Step S4). ). Then, the response signal transmission control function unit 150 returns to step S1 described above and tries to acquire the next response signal from the transmission buffer 140.

  Here, returning to the description of step S3, the response signal transmission control function unit 150 determines whether or not the current time has passed 2 seconds or more from the reception time. (No in step S3), the response signal and the reception time are returned to the original position of the transmission buffer 140 (step S5). Then, the response signal transmission control function unit 150 returns to step S1 described above and tries to acquire the next response signal from the transmission buffer 140.

[Effects of Example 1]
As described above, according to the first embodiment, the server 100 performs control so as to delay the transmission of the response signal even when the response signal can be transmitted, so that the response from the server is transmitted from the client terminal. The server is prevented from becoming congested due to triggering further requests. As a result of suppressing the server from falling into a congested state, it is possible to efficiently use the processing capability on the server side and provide a quick service to the client.

  That is, according to the first embodiment, even when the server 100 becomes ready to send a response signal, the server 100 does not immediately return the response signal to the client terminal, but has a certain delay time (for example, 2 seconds). After the elapse, a response signal is returned. Thereby, it is possible to prevent the Request signal from reaching the time zone in which the Discover signals transmitted from the client terminals are concentrated, and to concentrate the processing capability of the server 100 on the processing of the Discover signal. Therefore, it is possible to efficiently perform the process of dynamically determining the contents of the service while sequentially processing requests from the client terminal.

  In the first embodiment, a certain delay time is provided to delay the transmission of the response signal. However, the delay time is not limited to this, and the delay time is individually and randomly selected for each request signal. It can also be determined. Thereby, for example, even if arrival of the first signal such as the Discover signal is concentrated in a short period of time, the arrival time of the second signal such as the Request signal can be dispersed and the traffic amount can be leveled.

  In the first embodiment, priority information indicating that a response signal should be preferentially returned is set in advance in association with a client ID for identifying a client terminal (service subscriber). If priority information is set for the client terminal (client ID) that is the source of the request signal, set a shorter delay time. If priority information is not set, increase the delay time. It is also possible to control the return of the response signal. Thereby, it is also possible to provide individual specific services for each client terminal (service subscriber).

  In the first embodiment, the case where a certain delay time is provided to delay the transmission of the response signal has been described. However, the present invention is not limited to this, and transmission of a response signal may be determined according to the congestion status of the server 100. Therefore, in the following second embodiment, the configuration and processing of the server according to the second embodiment will be described in order, and then the effects of the second embodiment will be described.

[Server Configuration (Example 2)]
The configuration of the server according to the second embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating the configuration of the server according to the second embodiment. As shown in the figure, the server according to the second embodiment has basically the same configuration as the server according to the first embodiment, but differs in the points described below.

  That is, the request signal reception function unit 110 records the signal count number of the received request signal and also records the count start time. More specifically, at the start of the process, the current time is set as the count start time, and an initialization process for setting the signal count number to 0 is executed to enter a standby state for receiving a request signal from the client terminal.

  After the initialization process is completed, when the request signal reception function unit 110 receives the request signal, the request signal reception function unit 110 acquires the current time and determines whether the current time has passed 10 seconds from the count disclosure time. As a result of the determination, if 10 seconds have elapsed from the count disclosure time, a remainder obtained by dividing the difference between the current time and the count start time by 10 seconds is calculated. Then, a value obtained by subtracting the calculated remainder from the current time is updated as the count start time, and the signal count number is initialized to zero.

  For example, when the count start time is “10:00 minutes 10.005 seconds” and the current time is “10:00 minutes 35.900 seconds”, the request signal reception function unit 110 starts counting with the current time. The remainder obtained by dividing “25.895 seconds”, which is the difference from the time, by 10 seconds is calculated. Then, the calculated remainder “5.985 seconds” is subtracted from the current time, and “10:00 minutes 30.005 seconds” is updated as the count start time, and the signal count number is initialized to 0. To do.

  Then, the request signal reception function unit 110 sets the signal count number when the update of the count start time and the initialization of the signal count number are completed, or when the current time has not passed 10 seconds from the count disclosure time. After incrementing by 1, the reception signal is accumulated in the reception buffer, and the state returns to the reception standby state for the request signal from the client terminal.

  The request signal processing function unit 130 accumulates only the generated “Offer signal” or “Ack signal” in the transmission buffer 140.

  The response signal transmission control function unit 150 obtains the count start time and the signal count number from the request signal reception function unit 110, then obtains the current time, and obtains a preset congestion threshold. Then, it is determined whether or not a value obtained by dividing the signal count number by the difference between the current time and the count start time exceeds the congestion threshold. As a result of the determination, if the congestion threshold is exceeded, it is determined that the server 100 is in a congestion state, and then it is confirmed whether or not the free capacity of the reception buffer 120 is more than half of the total capacity.

  As a result of the confirmation, the response signal transmission control function unit 150 tries to obtain a response signal from the transmission buffer 140 when the free capacity of the reception buffer 120 is more than half of the total capacity. If the response signal can be acquired, it is returned to the client terminal. After sending the response signal to the client terminal or failing to obtain the response signal, the response signal transmission control function unit 150 returns to the processing start state.

  Further, as a result of confirming whether or not the free capacity of the reception buffer 120 is more than half of the total capacity, the response signal transmission control function unit 150 enters the processing start state as it is when the free capacity is not more than half of the total capacity. Return.

  The response signal transmission control function unit 150 determines that the server is not in a congestion state when the value obtained by dividing the signal count by the difference between the current time and the count start time does not exceed the congestion threshold. Attempts to acquire a received signal from the transmission buffer 140. If the received signal can be acquired, it is returned to the client terminal. After sending the response signal to the client terminal or failing to acquire the received signal, the response signal transmission control function unit 150 returns to the processing start state.

[Processing by Server (Example 2)]
Subsequently, a processing flow by the server according to the second embodiment will be described with reference to FIGS. 7 to 9 are diagrams illustrating a flow of processing by the server according to the second embodiment.

[Request signal reception processing]
First, the flow of request signal reception processing will be described with reference to FIG. As shown in the figure, the request signal reception function unit 110 sets the current time as the count start time at the start of processing (step S1), and executes an initialization process for setting the signal count number to 0 ( In step S2), a request signal reception waiting state from the client terminal is entered.

  After completion of the initialization process, the request signal reception function unit 110 waits for reception of the request signal from the client terminal (step S3). When the request signal is received (Yes in step S3), the current time is acquired (step S4). Then, it is determined whether or not the current time has passed 10 seconds from the count disclosure time (step S5). As a result of the determination, when the current time has passed 10 seconds from the count disclosure time (Yes at Step S5), the remainder obtained by dividing the difference between the current time and the count start time by 10 seconds is calculated, and the calculated remainder Is updated as the count start time, and the signal count is initialized to 0 (step S6).

  When the update of the count start time and the initialization of the signal count number are completed, the request signal reception function unit 110 increments the signal count number by 1 (step S7), and then accumulates the reception signal in the reception buffer (step S8). ), And returns to the waiting state for receiving the request signal from the client terminal (see step S3).

  Here, returning to the description of step S5, the request signal receiving function unit 110 determines whether or not the current time has passed 10 seconds from the count disclosure time, and as a result, the current time has passed 10 seconds from the count disclosure time. If not (No in step S5), the signal count is incremented by 1 in the same manner as in steps S7 and S8 described above, and then the received signal is stacked in the reception buffer and the request signal is received from the client terminal. Return to standby.

[Request signal processing]
Next, the flow of request signal processing will be described with reference to FIG. The request signal processing according to the second embodiment is different from the request signal processing (see FIG. 4) described in the first embodiment in the following points. That is, the request signal processing function unit 130 acquires only the reception signal from the reception buffer 120 and accumulates only the generated “Offer signal” or “Ack signal” in the transmission buffer 140 (see Steps S1, S5, and S8). .

[Response signal transmission control processing]
Next, the flow of response signal transmission control processing will be described with reference to FIG. As shown in the figure, the response signal transmission control function unit 150 obtains the count start time and the signal count from the request signal reception function unit 110 (step S1), and then obtains the current time (step S2). A preset congestion threshold is acquired (step S3). Then, it is determined whether or not the value obtained by dividing the signal count by the difference between the current time and the count start time exceeds the congestion threshold (step S4). As a result of the determination, if the congestion threshold is exceeded (Yes at Step S4), it is determined that the server 100 is in a congestion state, and then whether or not the free capacity of the reception buffer 120 is more than half of the total capacity is determined. Confirm (step S5).

  As a result of the confirmation, the response signal transmission control function unit 150 tries to acquire a received signal from the transmission buffer 140 (step S6) when the free capacity of the reception buffer 120 is more than half of the total capacity (Yes in step S5). If the received signal can be acquired (Yes at Step S6), it is returned to the client terminal (Step S7), and the process is returned to the start state (see Step S1). On the other hand, when the received signal cannot be obtained (No at Step S6), the process returns to the process start state.

  Here, returning to the description of step S5, the response signal transmission control function unit 150 confirms whether or not the free capacity of the reception buffer 120 is more than half of the total capacity. As a result, the free capacity is not more than half of the total capacity. In this case (No at Step S5), the process returns to the process start state.

  Returning to the description of step S4, the response signal transmission control function unit 150 determines whether or not the value obtained by dividing the signal count by the difference between the current time and the count start time exceeds the congestion threshold. When the congestion threshold is not exceeded (No at Step S4), it is determined that the server is not in a congestion state, and the reception signal is tried to be acquired from the transmission buffer 140 in the same manner as Step S6 described above. If the received signal can be acquired, it is returned to the client terminal. After sending the response signal to the client terminal or failing to acquire the received signal, the response signal transmission control function unit 150 returns to the processing start state.

[Effects of Example 2]
As described above, according to the second embodiment, since the response signal is determined to be transmitted according to the congestion status of the server 100, the contents of the service are dynamically determined while sequentially processing the requests from the client terminals. The amount of requests from clients can be leveled while efficiently performing processing. For this reason, according to the second embodiment, it is possible to provide a quick service to the client by efficiently using the processing capability on the server side.

  That is, according to the second embodiment, control is performed so that a response to the client is performed only when the server 100 is not congested or when the server 100 is congested but the reception buffer 120 has sufficient capacity. Therefore, it is possible to distribute the time of the second signal such as the Request signal that arrives from each client terminal at a timing when the processing capacity of the server 100 is sufficient, efficiently processing the request from the client, and traffic. Amount can be leveled.

  In the second embodiment, the response may be controlled to be delayed on condition that a certain amount of request is received from the client terminal per unit time. As a result, similar to the control described above, it is possible to efficiently process requests from the client, level the traffic volume, and provide a quick service to the client.

  In the second embodiment, the case where the timing of sending the response signal is measured according to the availability of the reception buffer 120 has been described. However, the present invention is not limited to this, and the number of received signals per unit time is limited. Accordingly, the response signal transmission timing may be measured. For example, if the number of received signals per unit time exceeds a predetermined threshold, the delay time is long, and if the number of received signals per unit time is below a predetermined threshold, the delay time is shortened.

  In the second embodiment, the case where the transmission of the response signal is controlled in consideration of both the congestion state of the server and the data accumulation state of the reception buffer has been described. However, the present invention is not limited to this. The transmission of the response signal may be controlled in consideration of one of the congestion state and the data accumulation state of the reception buffer.

  In the second embodiment, in consideration of both the congestion state of the server and the data accumulation state of the reception buffer, as described in the first embodiment, an individual delay time is provided, or the client Controls the sending of response signals by providing priority information indicating that each terminal (service subscriber) should preferentially send it back, or setting a delay time according to the number of received signals per unit time You can also. That is, determination of server congestion status, determination of reception buffer accumulation status, arbitrary delay time setting, priority information setting, delay time setting according to the number of received signals per unit time, arbitrarily combined, The transmission of the response signal can also be controlled.

  The first and second embodiments have been described as one embodiment of the server according to the present invention, but the present invention may be implemented in various different forms other than the above-described embodiments. . In the following, other embodiments included in the present invention will be described.

(1) Device Configuration, etc. Each component of the server 100 (see FIG. 2 or FIG. 6) illustrated in the first or second embodiment is functionally conceptual and is not necessarily physically configured as illustrated. I don't need it. That is, the specific form of distribution / integration of the server 100 is not limited to the illustrated one. For example, the request signal reception function unit 110, the request signal processing function unit 130, and the response signal transmission control function unit 150 are integrated. Also good. As described above, all or some of the constituent elements of the server 100 can be configured to be functionally or physically distributed / integrated in arbitrary units according to various loads or usage conditions. Furthermore, each processing function performed in the server 100 (see FIGS. 3 to 5 or 7 to 9) is entirely or arbitrarily part of the CPU and a program to be analyzed and executed by the CPU. Or can be realized as hardware by wired logic.

(2) Response transmission control program The various processes of the server 100 described in the first or second embodiment (for example, see FIG. 3 to FIG. 5 or FIG. 7 to FIG. 9) are prepared in advance. Is executed by a computer system such as a personal computer or a workstation. Therefore, in the following, an example of a computer that executes a response transmission control program having the same function as in the first or second embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating a computer that executes a response transmission control program.

  As shown in the figure, the computer 200 is configured by connecting a communication control unit 210, an HDD 220, a RAM 230, and a CPU 240 via a bus 300.

  Here, the communication control unit 210 controls communication related to various signals exchanged with the client terminal. The HDD 220 stores information necessary for the CPU 240 to execute various processes. The RAM 230 temporarily stores various information. The CPU 240 executes various arithmetic processes.

  As shown in FIG. 10, the HDD 220 includes a response transmission control program 221 that exhibits the same functions as the functional units included in the server 100 shown in the first or second embodiment, and response transmission control data 222. Is stored in advance. Note that the response transmission control program 221 can be appropriately distributed and stored in a storage unit of another computer that is communicably connected via a network.

  Then, the CPU 240 reads out the response transmission control program 221 from the HDD 220 and expands it in the RAM 230, whereby the response transmission control program 221 functions as a response transmission control process 231 as shown in FIG. That is, the response transmission control process 231 reads the response transmission control data 222 and the like from the HDD 220, expands them in an area allocated to itself in the RAM 230, and executes various processes based on the expanded data and the like. The response transmission control process 231 is the processing function unit (request signal reception function unit 110, request signal processing function unit 130, response signal transmission control function unit 150, etc.) of the server 100 described in the first or second embodiment. Corresponds to the processing executed in step.

  The response transmission control program 221 is not necessarily stored in the HDD 220 from the beginning. For example, a flexible disk (FD), a CD-ROM, a DVD disk, a magneto-optical disk, Each program is stored in a “portable physical medium” such as an IC card, and “another computer (or server)” connected to the computer 200 via a public line, the Internet, a LAN, a WAN, or the like. Alternatively, the computer 200 may read and execute each program from these.

(3) Response Sending Control Method The following response sending control method is realized by the server 100 described in the first or second embodiment. That is, a response transmission control method including a response transmission control step (for example, see step S3 in FIG. 5) for controlling the transmission of the response signal to be delayed even when the response signal can be transmitted is realized. .

  As described above, in the communication system, the server, the response transmission control method, and the response transmission control program according to the present invention, the client device transmits a request signal to the server, and the server returns a response signal to the request signal to the client device. By completing a series of processing with a single unit as a unit, it is useful when providing services to client devices. Especially when IP addresses are dynamically issued, the server side processing capacity is efficiently increased. It is suitable for providing quick services to clients.

It is a figure for demonstrating the outline | summary and characteristic of the server which concern on Example 1. FIG. 1 is a diagram illustrating a configuration of a server according to Embodiment 1. FIG. It is a figure which shows the flow of the process by the server which concerns on Example 1. FIG. It is a figure which shows the flow of the process by the server which concerns on Example 1. FIG. It is a figure which shows the flow of the process by the server which concerns on Example 1. FIG. 1 is a diagram illustrating a configuration of a server according to Embodiment 1. FIG. FIG. 10 is a diagram illustrating a processing flow by a server according to the second embodiment. FIG. 10 is a diagram illustrating a processing flow by a server according to the second embodiment. FIG. 10 is a diagram illustrating a processing flow by a server according to the second embodiment. It is a figure which shows the computer which performs a response transmission control program. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Server 110 Request signal reception function part 120 Reception buffer 130 Request signal processing function part 140 Transmission buffer 150 Response signal transmission control function part 200 Computer 210 Communication control part 220 HDD (Hard Disk Drive)
221 Response transmission control program 222 Response transmission control data 230 RAM (Random Access Memory)
231 Response sending control process 240 CPU (Central Processing Unit)
300 buses

Claims (8)

The client device provides a service to the client device by completing a series of processes that send a request signal for address delivery to the server and the server returns a response signal to the request signal to the client device. Communication system
The server
Response signal storage means for storing a response signal according to the request signal;
Even when a plurality of the client devices are activated all at once and the initial request signal transmitted at the time of activation is transmitted all at once, even if the response signal stored in the response signal storage unit is ready to be transmitted Response sending control means for controlling the sending of the response signal to be delayed ;
The server from the receiving status of the request signal and a congestion determination unit that determines whether or not the congestion state,
The response transmission control unit controls the response signal stored in the response signal storage unit to be transmitted without delay when the congestion determination unit determines that the server is not in a congestion state. communication system that is characterized in that. Further comprising the storage status determination means for determining whether or not the request signal storage means for storing the request signal is in a state in which the request signal can be stored;
The response sending control means determines whether or not the congestion judgment means is in the congestion state, and whether or not the request signal accumulation means by the accumulation status judgment means is capable of accumulating the request signal. 2. The communication system according to claim 1, wherein control is performed such that the response signal stored in the response signal storage unit is transmitted according to a combination of the determination results. The response transmission control means delays the transmission of the response signal so that the second request signal transmitted from each client device is distributed after the first request signal which is the initial request signal is transmitted. The communication system according to claim 1 , wherein the communication system is controlled. The response transmission control means controls the client device in which priority information indicating that the response signal should be returned preferentially is set so that the response signal transmission delay time is shortened. The communication system according to any one of claims 1 to 3 . Further comprising counting means for counting the number of said request signals received per predetermined unit time;
Wherein the response transmission control means, depending on the number of counted the request signal by said counting means, according to any one of claims 1-4, characterized in that to change the transmission delay time of the response signal Communication system. A server that provides a service to the client device by accepting a request signal for address delivery from the client device and completing a series of processing that returns a response signal to the request signal as a unit,
Response signal storage means for storing a response signal according to the request signal;
Even when a plurality of the client devices are activated all at once and the initial request signal transmitted at the time of activation is transmitted all at once, even if the response signal stored in the response signal storage unit is ready to be transmitted Response sending control means for controlling the sending of the response signal to be delayed ;
Congestion determination means for determining whether the server is in a congestion state from the reception status of the request signal,
The response transmission control unit controls the response signal stored in the response signal storage unit to be transmitted without delay when the congestion determination unit determines that the server is not in a congestion state. A server characterized by that. A response that is applied to a server that provides a service to a client device by completing a series of processing that accepts a request signal for address delivery from a client device and returns a response signal to the request signal as a unit. A transmission control method,
Responses stored in response signal storage means for storing response signals corresponding to the request signals when a plurality of the client devices are activated at the same time and the initial request signals transmitted at the time of activation are transmitted all at once. A response transmission control step for controlling the transmission of the response signal to be delayed even when the signal can be transmitted ; and
A congestion determination step for determining whether or not the server is in a congestion state from the reception status of the request signal,
The response sending control step performs control so that the response signal stored in the response signal storage means is sent without delay when it is determined by the congestion determination step that the server is not in a congestion state. A response sending control method characterized by the above. Receives a request signal for address delivery from the client device and completes a series of processing that returns a response signal to the request signal as a unit, and executes it on a computer as a server that provides services to the client device A response sending control program for
Responses stored in response signal storage means for storing response signals corresponding to the request signals when a plurality of the client devices are activated at the same time and the initial request signals transmitted at the time of activation are transmitted all at once. A response transmission control procedure for controlling the transmission of the response signal to be delayed even when the signal can be transmitted ;
Causing the computer to execute a congestion determination procedure for determining whether a server is in a congestion state from the reception status of the request signal;
The response transmission control procedure controls the response signal stored in the response signal storage means to be transmitted without delay when it is determined by the congestion determination procedure that the server is not in a congestion state. A response sending control program characterized by the above.

Images