Network system, communication relay device, communication terminal device, and program for communication terminal device

Abstract

PROBLEM TO BE SOLVED: To provide a network system wherein connection maintenance of an optimum channel is controlled according to the type of an application program and a use state. SOLUTION: The application program of a terminal 1 connected to a channel carries out inter-application communication with the application program of a server 3. When a period (non communication period) of receiving no packet from the terminal 1 exceeds a prescribed time, an access point 2 interrupts the channel of the terminal 1. Further, the access point 2 broadcasts a broadcast packet B for a prescribed time. The terminal 1 classifies types of application programs depending on the types and the use states and determines a system of maintaining the connection of a channel by each type. Then the terminal 1 determines / executes a system in matching with the start / end of the application program. The terminal 1 transmits a dummy packet so as to avoid the channel from being interrupted before the non communication period reaches a broadcast prescribed time.

Description

Technical field [0001] The present invention relates to the connection and disconnection of a loop between a communication relay device and a communication terminal device. Background technique [0002] Conventionally, when a communication relay device is used to connect a plurality of communication terminal devices to the Internet via a common circuit, although the communication terminal device is not operated, if the connection circuit is maintained, the communication cost increases, so if When the non-communication period (the period during which no packet is sent) of the communication terminal device exceeds a predetermined time, the communication relay device forcibly disconnects the loop. However, if the above-mentioned prescribed time is short, the problem will be that the circuit will be cut off immediately and reconnection must be made. If the above-mentioned prescribed time is long, the communication fee may not be as cheap as expected. Therefore, a solution is propos...

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Problems solved by technology

[0011] However, in the invention disclosed in Patent Document 1, since the communication relay device discriminates the type of application, the port number of the communication packet has to be used to discriminate the type.

For this reason, there is a problem that it is impossible to distinguish the type of application higher than UUCP and TELNET, such as table calculation and file generation, and it is impossible to perform corresponding circuit cutoff control according to the type of upper-level application.

Such a problem arises because the application software, such as word processing software or spreadsheet calculation, copes with communication interruption. Although the application software is used to deal with it, it is not designed on the premise that there will be a large change in the circuit state, or there is a problem in the application software. mistake

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