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Wireless communication system, wireless communication device, projector, and wireless communication method

a wireless communication and wireless communication technology, applied in the field of wireless communication systems, wireless communication devices, projectors, and wireless communication methods, can solve the problems of slave units not being able to determine which of the wireless networks corresponds to which, third parties cannot acquire third parties cannot achieve the ip address of the first terminal, so as to improve the convenience of wireless communication

Inactive Publication Date: 2015-04-23
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method for improving wireless communication in ad-hoc mode by allowing a second terminal to select one service set identifier based on the updated priority information, even when the IP address of the first terminal is changed or the SSID is changed. This makes wireless communication more convenient and improves user experience.

Problems solved by technology

In this case, even though the wireless networks are generated by the same master unit, the slave unit cannot determine which of the wireless networks corresponding to the SSIDs is a wireless network to which the slave unit makes connection.
Therefore, the third party cannot acquire the IP address of the first terminal even when the third party receives the SSID sent from the first terminal.
Therefore, the third party cannot acquire the IP address of the first terminal even when the third party receives the SSID sent from the first terminal.

Method used

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  • Wireless communication system, wireless communication device, projector, and wireless communication method
  • Wireless communication system, wireless communication device, projector, and wireless communication method
  • Wireless communication system, wireless communication device, projector, and wireless communication method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0037]FIG. 1 is an explanatory diagram showing a wireless communication system according to a first embodiment. The wireless communication system includes a personal computer 10 and a projector 20. The personal computer 10 includes a CPU 100, RAM 110, ROM 120, a hard disk 122, a wireless adapter 130, and an antenna 150. The wireless adapter 130 includes a service set identifier (SSID) storage region 140. The wireless adapter 130 corresponds to a “communicating section” in the claims, and the service set identifier storage region 140 corresponds to “memory storing a service set identifier as a candidate for selection” in the claims.

[0038]The hard disk 122 includes an IP address storing section 123, an identification information storing section 124, an SSID acquisition program product 125, an SSID selection program product 126, and an IP address acquisition program product 127.

[0039]Here, the IP address which is stored in the IP address storing section 123 is the IP address of the per...

second embodiment

[0052]FIGS. 4A and 4B are explanatory diagrams showing an SSID in a second embodiment. In the second embodiment, an SSID is not provided with an IP address itself of the projector 20, but with an item number of an address series corresponding to the IP address. FIG. 4A shows the structure of an SSID in the second embodiment. In this embodiment, 30 characters are assigned to a device name field, and 2 characters are assigned to an address series field. FIG. 4B is a table of correspondence between the item number of the address series and the IP address. The item number and the IP address have one-to-one correspondence. For example, when the item number is “01”, a corresponding IP address is “192.168.0.1”. The correspondence table is stored in both the personal computer 10 and the projector 20.

[0053]Since an operation flowchart of this embodiment is almost the same as the operation flowchart of the first embodiment, only a difference will be described. In step S350, the CPU 100 acquir...

third embodiment

[0055]FIGS. 5A and 5B are explanatory diagrams showing an SSID in a third embodiment. FIG. 5A shows the structure of an SSID in the third embodiment. The SSID of the third embodiment differs from the SSID of the first embodiment in that it is provided with a priority field for 2 characters. A two-digit number is assigned to the priority field. The CPU 200 of the projector 20 increments the value of the priority field by 1 every time the IP address is changed. When the IP address is changed when the value of the priority field is 99, the CPU 200 restores the value of the priority field to 0 (00). The value of the priority field is restored to zero when the IP address is changed when the value of the priority field is a predetermined value.

[0056]FIG. 6 is an operation flowchart of the personal computer in the third embodiment. The same steps in the operation of the personal computer in the third embodiment as those in the operation in the first embodiment are identified with the same ...

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Abstract

A wireless communication system performs ad-hoc mode communication, wherein a first terminal includes an identification information storing section, an IP address storing section, an SSID generating section generating a service set identifier, a beacon signal generating section generating a beacon signal including an SSID, and a priority information updating section updating priority information, and the second terminal includes an SSID acquiring section acquiring the SSID from the beacon signal, memory storing the SSID, an SSID selecting section selecting one SSID based on the priority information, an IP address acquiring section acquiring the IP address of the first terminal from the selected SSID, and a communicating section making a connection to the first terminal by using the acquired IP address.

Description

CROSS-REFERENCE TO THE RELATED APPLICATIONS[0001]This application is a continuation application of U.S. patent application Ser. No. 13 / 022,041 filed Feb. 7, 2011, which claims priority to Japanese Patent Application No. 2010-051460 filed Mar. 9, 2010, the entire disclosure of which is expressly incorporated by reference herein.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to technologies for wirelessly transmitting data to a projector.[0004]2. Related Art[0005]As a network configuration of a wireless network, there are infrastructure mode in which devices perform communication with each other via a base station and ad-hoc mode in which the devices perform communication directly with each other. Each device identifies a wireless network by using a service set identifier (SSID) and connects to a wireless network having a common SSID. In infrastructure mode, an SSID is usually set in advance by an administrator of the network, and an IP address is usually set au...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04W48/14H04W76/02H04W8/00
CPCH04W48/14H04W76/02H04W8/005H04W48/20H04W84/18H04W76/10H04W48/12
Inventor OTA, KOICHIROKITABAYASHI, KAZUYOSHI
Owner SEIKO EPSON CORP