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Wireless communication system, base station, wireless communication device, and wireless communication method

A technology of a wireless communication device and a wireless communication system, applied in the field of wireless communication systems, capable of solving problems such as low quasi-orthogonality and non-guaranteed orthogonality

Active Publication Date: 2018-10-16
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, between CAZAC sequences and other CAZAC sequences that are not cyclically shifted, although there is quasi-orthogonality in which the cross-correlation is somewhat low, complete orthogonality is not guaranteed

Method used

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  • Wireless communication system, base station, wireless communication device, and wireless communication method
  • Wireless communication system, base station, wireless communication device, and wireless communication method
  • Wireless communication system, base station, wireless communication device, and wireless communication method

Examples

Experimental program
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no. 1 Embodiment approach

[0045] figure 1 It is a diagram showing the radio communication system of the first embodiment.

[0046] The wireless communication system according to the first embodiment includes a base station 10 and wireless communication devices 21 to 25 . The base station 10 manages at least one cell, and accepts access from a wireless communication device belonging to the cell. The wireless communication devices 21 to 25 can access the base station 10 . Here, it is assumed that the wireless communication devices 21 to 25 belong to the same cell.

[0047] The wireless communication devices 21 to 25 may be fixed wireless communication devices or mobile wireless communication devices. Among the wireless communication devices 21 to 25 , the wireless communication devices 21 to 24 are wireless communication devices of the first type, and the wireless communication device 25 is a wireless communication device of the second type. The first type of wireless communication device is, for exa...

no. 2 Embodiment approach

[0057] figure 2 It is a figure showing the wireless communication system of 2nd Embodiment.

[0058] The wireless communication system of the second embodiment is a cellular communication system. This wireless communication system includes a base station 100 , a plurality of MTC terminals including MTC terminals 200 , 200 - 1 , 200 - 2 , and 200 - 3 , and one or more user terminals including a user terminal 300 . The MTC terminals 200 , 200 - 1 , 200 - 2 , 200 - 3 and the user terminal 300 belong to the same cell managed by the base station 100 . In addition, although there are adjacent cells and adjacent base stations, but in figure 2 record is omitted.

[0059] The base station 100 performs wireless communication with the MTC terminals 200, 200-1, 200-2, 200-3, and the user terminal 300, and is a wireless communication device connected to a wired network not shown. The base station 100 accepts access from the MTC terminals 200, 200-1, 200-2, 200-3 and the user terminal...

no. 3 Embodiment approach

[0182] Next, a third embodiment will be described. The description will focus on the differences from the second embodiment, and the description of the same items as the second embodiment will be omitted. The method of calculating the current position of each MTC terminal in the wireless communication system of the third embodiment is different from that of the second embodiment. The wireless communication system of the third embodiment has a base station 100a instead of figure 2 base station 100. In addition, the radio communication system of the third embodiment has MTC terminals 200a, 200a-1, 200a-2 instead of figure 2 MTC terminals 200, 200-1, 200-2.

[0183] Figure 14 is a block diagram showing another example of a base station.

[0184] The base station 100a has RF reception units 111 - 1 , . . . , 111 - n , weighting units 112 - 1 , . Also, the base station 100 a has a PUSCH demodulation unit 121 , a PUSCH decoding unit 122 , a PUCCH demodulation unit 123 , a P...

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Abstract

Increase the number of wireless communication devices that allow data to be sent using a channel. The base station (10) is a wireless communication device belonging to the same cell (21 to 25) at least one part divided into a plurality of groups. Base station (10) assigns a signal sequence (31) to group 1, assigns a signal sequence (33) to group 2, the signal sequence (31) is orthogonal to the signal sequence obtained by cyclic shifting itself, the signal sequence (33) and the signal sequence (31) and the signal sequence (31) are different from the signal sequence obtained by cyclic shifting, and the signal sequence obtained by cyclic shifting itself is orthogonal. Wireless communication apparatus belonging to group 1 (21, 22) using a signal sequence (31) or a signal sequence (31) obtained by cyclic shifting of the signal sequence (31) to extend the modulation of the data. Wireless communication apparatus belonging to group 2 (23, 24) using a signal sequence (33) or a signal sequence (33) obtained by cyclic shifting of the signal sequence (33) to extend the modulation of the data.

Description

technical field [0001] The present invention relates to a wireless communication system, a base station, a wireless communication device and a wireless communication method. Background technique [0002] Currently, there is a cellular wireless communication system in which a plurality of wireless communication devices access a base station. In such wireless communication systems, some wireless communication systems use extension signal sequences to perform code division multiplexing on the data of more than two wireless communication devices, so that the data can be transmitted from more than two wireless communication devices simultaneously on the same channel. The base station sends data. [0003] For example, in the wireless communication standard called LTE (Long Term Evolution: Long Term Evolution), it is possible to code-division-multiplex control data of two or more user terminals on an uplink control channel. An LTE base station uses one CAZAC (Constant Amplitude Z...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04
CPCH04W74/08H04J13/0062H04J13/0074H04J13/16H04J13/22H04L5/0053H04L5/0048H04L27/2607H04L41/0803H04W88/08
Inventor 陈红阳伊藤章
Owner FUJITSU LTD
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