JP2002271422A - Gateway, method of controlling relaying, program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a server from being loaded unnecessarily and from consuming resources under a heavy load when a gateway relays the request from a client to the server and the response from the server to the client. SOLUTION: The gateway 10 relays the request from the client 40 to the server 50 and the response from the server 50 to the client 40. The congestion detecting and flow rate control section 24 of the gateway application 20 of the gateway 10 controls the gateway 10 not to relay the response when the relaying of the response is stagnated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gateway, a relay control method, a program, and a recording medium.

[0002]

2. Description of the Related Art Conventionally, a gateway (device) relays a request from a client to a server and a response from the server to the client (response to the request). Here, the relay processing of the request and the relay processing of the response have been performed independently.

FIG. 1 is a diagram showing a configuration example of a gateway according to the prior art. The gateway 110 includes the gateway application 120 and the upstream reception buffer 13.
1, downlink transmission buffer 132, uplink transmission buffer 136
And a downlink reception buffer 137. The gateway application 120 includes an upstream communication protocol control unit 122 and a downstream communication protocol control unit 126.

[0004] The gateway 110 relays a request from the client 140 to the server 150 by the upstream communication protocol control unit 122, the upstream reception buffer 131, and the upstream transmission buffer 136.

[0005] The gateway 110 relays a response from the server 150 to the client 140 by the downlink communication protocol control unit 126, the downlink reception buffer 137, and the downlink transmission buffer 132.

[0006]

For example, HTTP (Hyper
In the content acquisition type service based on the Text Transfer Protocol, it is assumed that the data size of the response is much larger than the request. Also,
When the client and the gateway are connected to an unstable network such as a wireless line, it is easy for the client to receive a response delay.

[0007] If the response is delayed, the request is retransmitted. However, if the request is transferred to the server as it is, the congestion on the response side is further deteriorated. Also, data may be lost due to congestion of responses and requests.

As described above, in the conventional transfer method using the gateway, if the request cannot be processed between the gateway and the client due to the high load, if the request is continued, the server side consumes more load and resources than necessary. I will put it.

Therefore, an object of the present invention is to prevent a server from consuming unnecessary load and resources when the load is high, in relaying a request from a client to a server and a response from the server to the client by the gateway. It is to be.

[0010]

According to one aspect of the present invention, there is provided a gateway for relaying a request from a client to a server and a response from the server to the client. Request relay processing means for performing the relay processing of the request, response relay processing means for performing the relay processing of the response, and when there is a delay in the relay processing of the response by the response relay processing means, the request relay processing means Control means for controlling not to perform the relay processing of the request.

According to a second aspect of the present invention, there is provided the gateway according to the first aspect, wherein the response relay processing unit has a reception buffer and a transmission buffer, and the relay processing of the response is delayed. Includes a case where the transmission buffer becomes full.

According to a third aspect of the present invention, there is provided the gateway according to the first or second aspect, wherein the response relay processing unit relays the response using an operating system, and relays the response. The case where there is a delay includes a case where the operating system detects that there is a delay in the relay process of the response.

According to a fourth aspect of the present invention, there is provided the gateway according to any one of the first to third aspects, wherein the response relay processing means has a relay processing waiting queue for the response, and relays the response. The case where the processing is delayed includes a case where the length of the queue becomes equal to or longer than a predetermined length.

According to a fifth aspect of the present invention, there is provided the gateway according to any one of the first to fourth aspects, wherein the gateway is capable of simultaneously communicating with a plurality of clients and communicating with a plurality of servers. It is characterized in that communication can be performed simultaneously.

According to a sixth aspect of the present invention, there is provided the gateway according to any one of the first to fifth aspects, wherein the control means performs control for each client, and a response of a certain client by the response relay processing means. When there is a delay in the relay processing of the client, the request relay processing means is controlled not to perform the relay processing of the request of the client.

According to a seventh aspect of the present invention, there is provided the gateway according to any one of the first to sixth aspects, wherein the communication between the gateway and the client includes wireless communication. .

An invention according to claim 8 is a relay control method in a gateway for relaying a request from a client to a server and a response from the server to the client, wherein the request relay processing for relaying the request is performed. Step, a response relay processing step of performing the relay processing of the response,
A control step of performing control so that the request relay processing step is not performed when there is a delay in the relay processing of the response in the response relay processing step.

According to a ninth aspect of the present invention, there is provided a program for causing a computer to execute the relay control method according to the eighth aspect.

According to a tenth aspect of the present invention, there is provided a computer-readable recording medium storing a program for causing a computer to execute the relay control method according to the eighth aspect.

According to the above configuration, in the relay of the request from the client to the server and the response from the server to the client by the gateway, the server is not subjected to unnecessary load and resource consumption when the load is high. can do.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a diagram showing a configuration example of the gateway according to the embodiment of the present invention. The gateway 10 includes a gateway application 20 and an upstream reception buffer 3
1, a downlink transmission buffer 32, an uplink transmission buffer 36, and a downlink reception buffer 37. The gateway application 20 includes an upstream communication protocol control unit 22, a congestion detection and flow control unit 24, and a downstream communication protocol control unit 26.

The gateway 10 communicates from the client 40 to the server 50 by the upstream communication protocol controller 22, the upstream reception buffer 31, and the upstream transmission buffer 36.
Relays requests (packet data, etc.) to That is, the request from the client 40 is stored in the upstream reception buffer 31. The upstream communication protocol control unit 22 performs a process of reading the request from the upstream reception buffer 31 and transferring the request to the upstream transmission buffer 36 of the server 50. The requests stored in the upstream transmission buffer 36 are sequentially transmitted to the server 50.

The gateway 10 relays a response (such as packet data) from the server 50 to the client 40 by the downlink communication protocol control unit 26, the downlink reception buffer 37, and the downlink transmission buffer 32. That is, the response from the server 50 is stored in the downstream reception buffer 37. The downlink communication protocol control unit 26 performs a process of reading the response from the downlink reception buffer 37 and transferring the response to the downlink transmission buffer 32. The responses stored in the downstream transmission buffer 32 are sequentially transmitted to the client 40.

The congestion detection and flow control unit 24 detects a delay in the relay processing of the response. If there is a delay, the upstream communication protocol control unit 22 is controlled not to perform the request relay process. In the present embodiment, the congestion detection and flow control unit 24 notifies the upstream communication protocol control unit 22 of the delay, and when the upstream communication protocol control unit 22 receives the notification of the delay, the request flow control is being performed. Congestion detection and flow control unit 24,
When detecting that the delay has been eliminated, the control unit 22 notifies the upstream communication protocol control unit 22 to cancel the request flow control.

FIG. 3 is a flowchart showing an example of processing performed by the upstream communication protocol control unit 22. The upstream communication protocol control unit 22 determines that the flow rate is not being controlled (S2
0), the request is read from the upstream reception buffer 31 (S30). Then, the request is transferred to the upstream transmission buffer 36 (S40). On the other hand, if the flow control is being performed (S20), the request is not read from the upstream reception buffer 31 (S50).

When the flow rate is restricted by connection-type communication, a request from the client is not received, but a request for disconnection from the client is received, and the connection disconnection process can be performed.

The delay in response relay processing may be caused, for example, when the downstream transmission buffer 32 becomes full. The fact that the buffer is full depends on the OS
(Operating system) may detect and notify the gateway application 20;
The gateway application 20 may make an inquiry to the OS at any time.

The delay in the relay process of the response may be caused by, for example, network congestion between the gateway 10 and the client 40, or the delay in the response receiving process in the client 40. It is conceivable that the OS detects such a delay and notifies the gateway application 20 of the delay. If wireless communication is included in the communication between the gateway 10 and the client 40, it is considered that the response receiving process in the client 40 is likely to be delayed.

Further, for example, when the downlink communication protocol control unit 26 has a queue for waiting for relay processing of a response, and when the length of the queue exceeds a predetermined length, the relay processing of the response is delayed. It is considered that there is.

The gateway 10 can communicate with a plurality of clients simultaneously, and can communicate with a plurality of servers simultaneously.

The correspondence between the request and the response is performed for each client, and at the same time, it is controlled independently of the signals of other clients using the gateway 10. That is, if there is a delay in the relay processing of the response of a certain client, the control is performed so that the relay processing of the request of the client is not performed. The upstream receiving buffer 31, the upstream transmitting buffer 36, the downstream receiving buffer 37,
The downlink transmission buffer 32 is prepared for each client.

As described above, when the load is high, the gateway 10 suppresses the request from the client 40 to the server 50, so that the traffic between the gateway and the server can be suppressed. By suppressing the request, the response itself can also be suppressed.

Further, since the request and the response are processed in the gateway 10 in correspondence with each other, traffic control is possible without exchanging an extra control signal relating to traffic information between the devices.

The gateway application 2
0, OS and other programs are stored on a recording medium (for example, CD-
(ROM, magnetic disk) or reading from a recording medium.

[0036]

As described above, according to the present invention, in relaying a request from a client to a server and a response from a server to a client by a gateway, unnecessary load and resources on the server side are required when the load is high. You can avoid spending.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a gateway according to the related art.

FIG. 2 is a diagram illustrating a configuration example of a gateway according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a processing example performed by an uplink communication protocol control unit;

[Explanation of symbols]

 10, 110 gateway 20, 120 gateway application 22, 122 upstream communication protocol control unit 24 congestion detection and flow rate restriction unit 26, 126 downstream communication protocol control unit 31, 131 upstream reception buffer 32, 132 downstream transmission buffer 36, 136 upstream transmission buffer 37, 137 Downlink reception buffer 40, 140 Client 50, 150 Server

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Imamoto Suzuki 2-11-1, Nagatacho, Chiyoda-ku, Tokyo Inside NTT DoCoMo, Inc. (72) Inventor Shigeo Kakuda Shibago, Minato-ku, Tokyo No. 7-1 NEC Corporation F Term (Reference) 5K030 GA13 HA08 HC01 KA01 KA06 KA13 KX12 KX13 LC03 LC11 MB15 5K033 AA05 CB08 CC01 DB18

Claims (10)

[Claims] 1. A gateway for relaying a request from a client to a server and a response from the server to the client, a request relay processing unit for relaying the request, and a response for relaying the response Relay processing means; and control means for controlling the request relay processing means not to perform the relay processing of the request when there is a delay in the relay processing of the response by the response relay processing means. And gateway. 2. The gateway according to claim 1, wherein the response relay processing means has a reception buffer and a transmission buffer, and when the response relay processing is delayed, the response buffer is full. Characterized in that it includes a case where 3. The gateway according to claim 1, wherein the response relay processing means performs an operation of relaying the response using an operating system. A case where the operating system detects that there is a delay in relay processing of the response. 4. The gateway according to claim 1, wherein said response relay processing means comprises:
A gateway having a queue for waiting for relay processing of the response, and the case where there is a delay in the relay processing of the response includes a case where the length of the queue becomes a predetermined length or more. 5. The gateway according to claim 1, wherein the gateway can simultaneously communicate with a plurality of clients, and can communicate with a plurality of servers simultaneously. A gateway, characterized in that: 6. The gateway according to claim 1, wherein the control unit controls each client, and there is a delay in relay processing of a response of a certain client by the response relay processing unit. In this case, the gateway controls the request relay processing unit so as not to perform the relay processing of the request of the client. 7. The gateway according to claim 1, wherein communication between the gateway and the client includes wireless communication. 8. A relay control method in a gateway for relaying a request from a client to a server and a response from the server to the client, a request relay processing step of relaying the request, and relaying the response. A relay relay processing step of performing processing; and a control step of controlling not to perform the request relay processing step when there is a delay in the relay processing of the response in the response relay processing step. Control method. 9. A program for causing a computer to execute the relay control method according to claim 8. 10. A computer-readable recording medium on which a program for causing a computer to execute the relay control method according to claim 8 is recorded.