JP5337263B2 - Information transmission system and information transmission method - Google Patents

Description

  Embodiments described herein relate generally to an information transmission system and an information transmission method.

  Usually, when transmitting information from a transmission device to a reception device, transmission data is divided into blocks and transmitted. The receiving device transmits a reception completion response signal to the transmitting device every time one block is received.

  When the transmission apparatus receives this reception completion response signal within the timeout time, it determines that the transmission of the transmitted block has been normally completed, and transmits the next block.

  Here, the data length of one block becomes a problem. That is, if the data length of one block is too short, the transmission efficiency is deteriorated, and if it is too long, the probability that timeout will occur increases.

  In this regard, if the data length of one block is variable and the data length of one block to be transmitted is transmitted to the receiving side, and the receiving side receives the data of the received data length, the transmission of one block is completed. Techniques for determining have been proposed.

  However, there is no change in the probability that a timeout will occur if the data length of one block is increased due to the bandwidth and traffic of the network used for information transmission.

JP 2004-56780 A

  Therefore, there is a need for an information transmission system and an information transmission method that enable efficient information transmission in accordance with the state of the network.

In order to solve the above problems, an embodiment of the present invention includes a transmitter for transmitting the transmission data via a communication network, and a receiving apparatus for receiving transmission data via a communication network, The transmission device transmits transmission data block by block to the reception device, the reception device transmits a reception completion response to the transmission device every time reception of one block is completed, and the transmission device completes reception from the start of transmission of the block. A response time, which is a time until receiving a response, is measured for each block, and the transmission apparatus provides an information transmission system that sets a data length per block to be transmitted next based on the response time.

It is a block diagram which shows the structure of an information transmission system. It is a figure which shows the structure of the transmission data which a transmitter transmits. It is a graph which shows the increase / decrease method of the number of sectors per block. It is a figure which shows the mode of transmission / reception with a transmitter and a receiver. It is a flowchart which shows operation | movement of a transmitter.

  Hereinafter, an embodiment of an information transmission system and an information transmission method will be described in detail with reference to the drawings.

  The information transmission system of this embodiment includes a transmission device that transmits information via a communication line network and a reception device that receives information via the communication line network. The transmission device receives data block by block. When the reception of one block is completed, the reception device transmits a reception completion response to the transmission device, and the transmission device is a response time that is a time from the start of transmission of the block to reception of the reception completion response. The transmission apparatus sets the data length per block to be transmitted next based on the response time.

  FIG. 1 is a block diagram showing the configuration of the information transmission system of this embodiment. As illustrated in FIG. 1, the information transmission system includes a transmission device 100 that transmits information via a communication line network 300 and a reception device 200 that receives information transmitted via the communication line network 300.

  The transmission device 100 can use a so-called computer or server. Specifically, the transmission device 100 includes a CPU 101 that is an arithmetic device, a storage device 102 selected from a memory such as ROM and RAM, and a nonvolatile storage device such as a flash ROM and a hard disk drive, a keyboard, a mouse, and a display. And a communication interface (hereinafter referred to as I / F) 104 for performing communication.

  The transmission device 100 may be a LAN network node, a mobile phone, or a PON (Passive Optical Network) node.

  As the receiving device 200, a so-called computer, server, or digital signage display device can be used. Specifically, the receiving device 200 includes a CPU 201 that is an arithmetic device, a storage device 202 selected from a memory such as ROM and RAM, and a nonvolatile storage device such as a flash ROM and a hard disk drive, a keyboard, a mouse, and a display. And the like, and a communication I / F 204 that performs communication.

  The receiving device 200 may be a LAN network node, a mobile phone, or a PON (Passive Optical Network) node.

  Examples of the communication line network 300 include, but are not limited to, a public communication line network such as the Internet, a wireless communication network such as a mobile phone, an optical network such as a PON, and a LAN (Local Area Network).

  FIG. 2 is a diagram illustrating a structure of transmission data transmitted by the transmission device 100. As shown in FIG. 2, the transmission data is divided into one or a plurality of blocks. One block or includes a plurality of sectors. The data length of one sector is, for example, 1 kb.

  According to the example shown in FIG. 2, the first block is composed of sectors, the next block is composed of k1 sectors, and the last block is composed of kn sectors.

  The transmitting apparatus 100 can increase or decrease the number of sectors per block.

  FIG. 3 is a graph showing a method of increasing / decreasing the number of sectors per block. In FIG. 3, the vertical axis indicates the block length, that is, the number of sectors per block, and the horizontal axis indicates the response time, that is, the time from the start of transmission until the reception completion response transmitted by the receiving apparatus is received.

  The transmission device 100 stores the minimum transfer time (MinTT), the maximum transfer time (MaxTT), and the maximum data length (MaxDL) of one block in the storage device 102. The minimum transfer time is shorter than the maximum transfer time. The maximum transfer time is less than ½ of the timeout time (Tout).

  As shown in the graph 301 of FIG. 3, the transmitting apparatus 100 changes the number of sectors, which is the data length of one block, according to the response time. Specifically, it is changed as follows.

(I) When the response time is shorter than the minimum transfer time (RT <MinTT)
The transmission apparatus 100 sets the maximum data length (MaxDL), for example, 32 sectors, to the number of sectors in one block.

(Ii) When the response time is not less than the minimum transfer time and not more than the maximum transfer time (MinTT ≦ RT ≦ MaxTT)
The transmitting apparatus calculates and sets the number of sectors per block by using, for example, a linear function formula, specifically, the following formula (1).

(Number of sectors per block)
= ((MaxDL) × ((MaxTT−MinTT) − (RT−MinTT)))) /
(MaxTT-MinTT) (1)
According to the equation (1), the transmission device 100 assigns more data to one block as the response time RT becomes shorter.

(Iii) When the response time is longer than the maximum transfer time (MaxTT <RT)
The transmission apparatus 100 sets the minimum data length (MinDL), for example, one sector, to the number of sectors in one block.

  FIG. 4 is a diagram illustrating a state of transmission / reception between the transmission device 100 and the reception device 200. As shown in FIG. 4, after the communication is established, the transmitting apparatus 100 allocates one sector to the first block and starts transmission.

  When the reception of one block is completed, the reception device 200 transmits a reception completion response to the transmission device 100.

  The transmission device 100 measures a response time RT, which is a time until there is a reception completion response from the reception device 200, using a timer included in the transmission device 100.

  The transmitting apparatus 100 calculates and sets the number of sectors (K2) in the second block based on the response time (RT1) measured in the transmission in the first block.

  The transmitting apparatus 100 allocates k2 sector to the second block and starts transmission.

  When the reception of one block is completed, the reception device 200 transmits a reception completion response to the transmission device 100.

  The transmission device 100 measures a response time RT, which is a time until there is a reception completion response from the reception device 200, using a timer included in the transmission device 100.

  The above operation is repeated until transmission of transmission data is completed.

  FIG. 5 is a flowchart showing the operation of the transmission apparatus 100. As shown in FIG. 5, in operation 501, the transmission device 100 resets the timer.

  In operation 502, the transmission apparatus 100 sets the minimum data length (MinDL), for example, 1 to the number of sectors in one block.

  In operation 503, the transmission apparatus 100 allocates data of the set number of sectors to one block, and starts transmitting this one block to the reception apparatus 200.

  In operation 504, the transmitting apparatus 100 starts a timer and starts measuring a response time.

  In operation 505, the transmission device 100 determines whether a reception completion response (ACK) has been received from the reception device 200. If the transmitting apparatus 100 determines that a reception completion response has been received from the receiving apparatus 200, the transmitting apparatus 100 proceeds to operation 506, and if it determines that it has not been received, the transmitting apparatus 100 returns to operation 505.

  In operation 506, the transmitting apparatus 100 stops the timer and ends the response time measurement.

  In operation 507, the transmission device 100 calculates the number of sectors per block based on the measured response time.

  In operation 508, the transmitting apparatus 100 sets the calculated number of sectors as the number of sectors per block.

  In operation 509, the transmitting apparatus 100 resets the timer and returns to operation 503.

  As described above, the information transmission system of the present embodiment includes the transmission device 100 that transmits information via the communication line network 300 and the reception device 200 that receives information via the communication line network 300. The transmission apparatus 100 transmits data to the reception apparatus 200 one block at a time, and the reception apparatus 200 transmits a reception completion response to the transmission apparatus 100 when reception of one block is completed. The response time, which is the time from the start of transmission until the reception completion response is received, is measured, and the transmission device 100 sets the data length per block to be transmitted next based on this response time.

  Therefore, the data length of one block can be changed according to the communication state of the network such as the speed of the communication line and the load state of the receiving device 200, and efficient information transmission according to the state of the network becomes possible. There is an effect.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

100: Transmitting apparatus 200: Receiving apparatus 300: Communication network

Claims (6)

A transmission device that transmits transmission data via a communication network;
A receiving device for receiving the transmission data via the communication line network,
The transmitting device transmits the transmission data block by block to the receiving device,
The receiving device transmits to the transmitter a reception completion response to the time the reception of the one block is completed,
The transmitting device measures a response time for each block, which is a time from the start of transmission of the block to reception of a reception completion response,
The transmission apparatus is an information transmission system in which a data length per block to be transmitted next is set based on the response time. The transmitter is
The information transmission system according to claim 1, wherein more data is allocated to one block as the response time is shorter. The transmitter is
A storage device for storing a maximum data length of one block value and a minimum threshold value of the response time;
3. The information transmission system according to claim 2, wherein when the response time falls below the minimum threshold, the maximum data length is assigned to a data length per block. A transmission device that transmits transmission data via a communication network;
In an information transmission system comprising: a receiving device that receives the transmission data via the communication line network;
The transmitting device transmits the transmission data block by block to the receiving device,
The receiving device transmits to the transmitter a reception completion response to the time the reception of the one block is completed,
The transmitting device measures a response time for each block, which is a time from the start of transmission of the block to reception of a reception completion response,
The transmission apparatus is an information transmission method for setting a data length per block to be transmitted next based on the response time. The transmitter is
5. The information transmission method according to claim 4, wherein more data is assigned to one block as the response time is shorter. The transmitter is
A storage device for storing a maximum data length of one block value and a minimum threshold value of the response time;
6. The information transmission method according to claim 5, wherein when the response time falls below the minimum threshold, the maximum data length is assigned to a data length per block.

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