Transmitter, receiver, communication system and communication method

Abstract

Provided is a communication system including a transmitter and a receiver which carry out communication by establishing connection of their plurality of communication layers, the transmitter comprising: connection request generating means for generating a connection request containing a command and data required for connecting a number of contiguously adjacent layers among the plurality of communication layers; and connection request transmitting means for transmitting the connection request to the receiver, the receiver comprising: connection request receiving means for receiving a connection request containing a command and data required for connecting a number of contiguously adjacent layers among the plurality of communication layers; and connection establishing means for extracting the command and data from the connection request, and establishing connection for the plurality of communication layers based on the command and data. In this way, the time taken to establish connection is reduced. Therefore, even when the connection is cut off during the data exchange, the connection can be established again without taking much time, allowing quick recovery of data exchange.

Description

technical field [0001] The present invention relates to a transmitter, a receiver, a communication system, a communication method, and a communication program that establish a connection and perform wireless or wired communication. Background technique [0002] In recent years, the CCD (Charge Coupled Device) mounted in portable devices such as mobile phones, digital cameras, digital video cameras, and PDAs (Personal Digital Assistant) has continuously improved image quality, and high-quality digital images can be captured easily. [0003] As a method of sharing such video, there are methods of moving and displaying the video file by using a recording medium, transferring by mail, wired connection, wireless connection, or printing on paper and transferring. [0004] Among them, in particular, as a method of simply transferring video files from a portable device to other electronic devices such as display devices, printing devices, recording devices, other portable devices, a...

AI Technical Summary

Problems solved by technology

[0038] In IrDA, wireless communication is performed as above, but in terms of optical characteristics, the infrared interface between communication devices reaches a certain angle (±15° in the IrDA standard) or reaches a certain angle. When the distance exceeds a certain distance (20cm or 1m according to the standard in IrDA), even if there is a highly reliable communication method, communication may not be possible halfway

[0039] Therefore, according to the IrDA method, it takes time for station search and information exchange, and during data transmission, the transmitter and receiver frequently confirm the transmission and reception of data, so the transmission efficiency decreases.

As a result, in the infrared communication of the IrDA method, there is a problem that the transmission time is long, and the possibility that the communication may not be performed halfway is high.

[0040] In addition, as a method of wirelessly transmitting a file to another device and displaying it, for example, it is described in Japanese Laid-Open Patent Publication 'Special Publication No. 2004-509527 (publication date: March 25, 2004), Japanese Patent Laid-Open 2000 -69403 bulletin (publication date: March 3, 2000) and JP-A-2001-83948 bulletin (publication date: March 31, 2001), but even these methods, in the case of communication using infrared rays , producing the same disadvantages

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