Communication device and wireless communication system

A technology for a wireless communication system and a communication device, applied in the field of wireless communication systems, can solve problems such as low transmission power, achieve the effects of efficient frequency management, improve data transmission efficiency, and improve frequency utilization efficiency

Inactive Publication Date: 2011-05-11
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If relay transmission is performed, the transmission power in the transmitter is suppressed smaller than when the signal is directly transmitted from the transmitter to the receiver

Method used

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  • Communication device and wireless communication system
  • Communication device and wireless communication system
  • Communication device and wireless communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0068] figure 1 It is a diagram showing a configuration example and a basic signal transmission operation of the wireless communication system according to the present embodiment. figure 1 The shown wireless communication system includes: a terminal T as a communication device on the transmitting side; a base station BS as a communication device on the receiving side; Device R 1 , R 2 , R 3 ). In addition, as long as the terminal T and each of the relay devices R is a wireless device, any of a mobile terminal, a terminal constantly connected to a power source, and a personal computer may be used. exist figure 1 , showing the relay device R 1 A case where a signal transmitted from the terminal T is relayed.

[0069] in addition, figure 2 It is a diagram showing an example of the relationship between the timing of signal transmission by the terminal T and the relay device R in the wireless communication system according to the present embodiment and the wireless reso...

Embodiment approach 2

[0090] Next, Embodiment 2 will be described. In Embodiment 1, relay transmission by a single relay device was mainly described, but in this embodiment, relay transmission by a plurality of relay devices will be described. In addition, the configuration of each relay device is the same as that of the relay device shown in Embodiment 1 (refer to Figure 4 )same.

[0091] Figure 7 It is a diagram showing a configuration example of a radio communication system according to Embodiment 2 and basic signal transmission operations. in addition, Figure 8 It is a diagram showing an example of relay transmission according to Embodiment 2, and more specifically, it is a diagram showing signal transmission operations of the terminal T and each relay device R and radio resources used at this time. in addition, Figure 7 The configuration and embodiment 1 of the wireless communication system shown (refer to figure 1 )same.

[0092] Below, according to Figure 7 as well as Figure ...

Embodiment approach 3

[0098] Next, Embodiment 3 will be described. In Embodiment 2, relay transmission by a plurality of relay devices was described. In this embodiment, relay transmission by a relay device having a plurality of antennas (multiple transmission / reception systems) is described. In addition, the configuration of the relay device according to the present embodiment is the same as that of the relay device according to Embodiment 1 except that it has a plurality of antennas. For example, with the same number of antennas Figure 4 Transmit / receive system shown.

[0099] Figure 9 It is a diagram showing an example of relay transmission according to Embodiment 3, more specifically, it shows a relay device R including a terminal T and a plurality of antennas 1 A diagram of the signaling operation and the radio resources used at this time. In Embodiment 2, a structure in which each relay device performs relay transmission using a different frequency is applied, but it is also possible to...

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PUM

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Abstract

Provided is a communication device, which constitutes a wireless communication system together with a base station and a terminal station and relays and transfers a signal transmitted and received between the base station and the terminal station. The communication device is characterized in that, when the communication device receives a signal transmitted from the base station or the terminal station, the communication device uses a frequency different from a frequency at the time of the receiving and transfers the received signal after amplifying the same.

Description

technical field [0001] The present invention relates to, for example, a communication device positioned between a base station and a terminal to relay signals transmitted from them to a receiving side, and a wireless communication system including the communication device. Background technique [0002] In recent high-speed wireless communication systems, a large transmission power is required as the transmission rate increases. However, in reality, there is a limit in the transmission power of the transmitter, and a technique capable of securing a coverage area with the limited transmission power is required. In response to such a request, relay transmission has attracted attention in recent years as a solution to it. In relay transmission, a relay device amplifies a signal from a transmitter and transmits it to a receiver. If relay transmission is performed, the transmission power in the transmitter is suppressed to be smaller than when the transmitter directly transmits ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/15H04B7/02H04B7/06H04B7/12H04J1/00H04J3/00H04J11/00H04W16/26H04W72/04
CPCH04B7/12H04B7/15542H04B7/2606H04L5/0007H04L5/0023H04L5/0032H04L5/0037H04L5/0048H04L5/006H04W84/047H04W72/00
Inventor 原嘉孝山冈智也
Owner MITSUBISHI ELECTRIC CORP
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