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Radio communication system

A wireless communication system and wireless communication terminal technology, applied in the field of wireless communication systems, can solve problems such as the inability to solve the third problem

Inactive Publication Date: 2006-01-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the first and second items can be solved, but the third item which satisfies the predetermined D / U ratio cannot be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] figure 1 is a block diagram of the configuration of the wireless communication system according to the block diagram of Embodiment 1 of the present invention.

[0173] figure 1 , the wireless communication system includes a control device 10, relay devices 20-1 to 20-n (n: a natural number of 1 or greater), and wireless communication terminals 30-1 to 30-n. The control device 10 and the relay devices 20-1 to 20-n are connected to each other through optical transmission paths 40-1 to 40-n, respectively. Relay devices 20-1 to 20-n and wireless communication terminals 30-1 to 30-n are wirelessly connected to each other. The optical transmission path is, for example, an optical fiber.

[0174] The control device 10 and an external network (not shown) are connected to each other by an Ethernet (registered trademark) cable 60 . The control device 10 and the external network may be connected to each other by cables other than the Ethernet (registered trademark) cable 60 ...

Embodiment 2

[0220] Figure 8 It is a block diagram showing the configuration of the control device 10b included in the wireless communication system according to Embodiment 2 of the present invention.

[0221] Figure 8 The control device 10b shown with figure 2 The control device 10 shown is different in that a transmission signal division section 107 is included instead of the light division section 103 . Other parts of the structure are basically the same as those of Embodiment 1, basically the same as figure 2 Components that are the same as those in 1.0 and 2.1.1 have the same reference numerals and descriptions thereof will be omitted. In this embodiment, in addition to not including the level control section 207, the relay device 20 has image 3 structure shown.

[0222] In control device 10 b , transmission signal processing section 101 modulates a signal transmitted from an external network and outputs the modulated signal to transmission signal dividing section 107 .

[...

Embodiment 3

[0268] Hereinafter, a wireless communication system according to Embodiment 3 of the present invention will be described. The wireless communication system according to this embodiment stops wireless signal transmission from the relay device upon detection of optical signal quality degradation. When a wireless signal with degraded quality is transmitted or received, it may negatively affect other communication devices or the human body. Therefore, when using wireless signals for communication, the quality of the wireless signals sent by the communication device must meet the common conditions stipulated by radio regulations. In this embodiment, an exemplary case where a wireless communication system evaluates the quality of an optical signal will be described.

[0269] Figure 14 is a block diagram showing the configuration of the relay device 20b included in the wireless communication system according to the present embodiment. Figure 14 Among them, the relay device 20b i...

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PUM

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Abstract

A radio communication system wherein the level of a radio signal received by a relay apparatus (20) can be confined within a predetermined dynamic range. In a control apparatus (10), a transmission part (102) converts a downstream electric signal to a downstream optical signal and transmits the downstream optical signal to the relay apparatus (20) via an optical transmission path (40). The relay apparatus (20) then converts the received downstream optical signal to the downstream electric signal and transmits this downstream electric signal as a radio signal from a transmission / reception antenna part (204) to a radio communication terminal (30). In the relay apparatus (20), a level adjustment part (207) adjusts the level of radio signals, which is to be transmitted by the relay apparatus (20), such that the reception intensity of radio signals to be received by the relay apparatus will be confined within a predetermined range.

Description

technical field [0001] The present invention relates to a system in which a control device communicates with a wireless communication terminal via a relay device, and more particularly to a system in which the control device and the relay device are connected to each other via an optical transmission path. Background technique [0002] Recently, a wireless communication system has been used in which a relay station for wireless communication with a wireless communication terminal is connected to a control device via an optical transmission path (for example, Japanese Laid-Open Patent Application No. 9-233050). [0003] FIG. 43 is a diagram showing the structure of a conventional wireless communication system described in Japanese Laid-Open Publication No. 9-233050. In the wireless communication system shown in FIG. 43 , the control device 19 converts the modulated signal into an optical signal and transmits the optical signal to the relay device 29 via the optical transmissi...

Claims

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Application Information

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IPC IPC(8): H04Q7/36H04L12/28H04B10/20H04W52/14H04B10/2575H04W52/24H04W88/08
Inventor 内海邦昭山本浩明增田浩一新保努武中曾麻理子田中和夫笹井裕之
Owner PANASONIC CORP
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