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

A wireless communication system and mobile station technology, applied in the field of wireless communication systems, can solve problems such as the impact of physical channel communication quality, and achieve the effect of reducing interference

Active Publication Date: 2018-04-06
FUJITSU CONNECTED TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned inter-cell interference affects the communication quality of each physical channel (control channel, data channel)

Method used

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

Examples

Experimental program
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Embodiment 1

[0047] First, the configuration of a wireless communication system according to an embodiment disclosed in this application will be described. Figure 7 It is a diagram showing the configuration of the wireless communication system of the first embodiment. Such as Figure 7 As shown, the wireless communication system 1 has a pico base station 100 and a macro base station 200 . The pico base station 100 has a control unit 100a and a communication unit 100b. The control unit 100 a includes an interference reduction CCE setting unit 101 , a scheduling unit 102 , a radio resource control unit 103 , an inter-cell interference determination unit 104 , an uplink control signal demodulation unit 106 , and a data signal generation unit 107 . Furthermore, the control unit 100 a includes a control signal generation unit 108 , a reference signal generation unit 109 , a channel multiplexing unit 110 , an IFFT (Inversed Fast Fourier Transform) unit 111 , and a transmission timing control ...

Embodiment 2

[0090] In Embodiment 2, an example in which a technique of concentrated masking corresponding to a plurality of pico base stations is applied to the radio communication system in Embodiment 1 will be described. In this embodiment, unlike Embodiment 1, a network environment in which a plurality of picocells exist in a macrocell is assumed.

[0091] In this embodiment, in the masking control unit 203 of the macro base station 200 , how to determine whether to actually apply masking based on the masking request signals notified from a plurality of pico base stations is a problem. As a criterion for this judgment, it is judged whether or not the number of pico base stations to which masking is requested exceeds a predetermined threshold.

[0092] As a first example, as a design policy of the mobile communication system, it is possible to place emphasis on reducing the interference of the control channel from the macro base station 200 to the pico base station 100 . In this case, ...

Embodiment 3

[0097] In Embodiment 3, an example of applying a technique of time-division masking corresponding to a plurality of pico base stations to the wireless communication system in Embodiment 1 will be described. In this embodiment, unlike Embodiment 1, a network environment in which a plurality of picocells exist in a macrocell is assumed.

[0098] In Embodiment 2, the masking control unit 203 sets the masking area of ​​the macro cell so as to include all RE positions where the interference reducing CCEs of each picocell are mapped. As a result, it is possible to collectively perform interference control on interfered pico UEs in a plurality of pico cells. On the other hand, however, there is a tendency for the required shaded area to increase. Therefore, in this embodiment, the wireless communication system ensures that the required shielding area is small, and performs interference control on interfered pico UEs in multiple pico cells. In order to achieve this interference cont...

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Abstract

The radio communication system (1) controls transmission timing in each cell so that a control channel of a first cell and a data channel of a second cell overlap in time. A radio communication system (1) has a base station (100) of a first cell. A base station (100) of a first cell has a first control unit (100a) and a first communication unit (100b). The first control unit (100a) notifies the base station of the second cell of information for specifying resources of a control channel of the first cell. Also, the first control unit (100a) sets a resource of a control channel of the first cell as a first resource to be decoded by a mobile station of the first cell. Based on the setting of the first resource by the first control unit (100a), the first communication unit (100b) notifies the mobile station of the first cell of information for decoding the first resource, and transmits the first resource to the mobile station using the first resource. A mobile station in cell 1 transmits a control signal.

Description

technical field [0001] The present invention relates to a wireless communication system, a base station, a mobile station and a wireless communication method. Background technique [0002] Conventionally, in LTE (Long Term Evolution: Long Term Evolution) and LTE-Advanced, which are next-generation mobile communication systems, studies on heterogeneous networks have been conducted in order to expand system capacity and coverage. The heterogeneous network refers to a network in which a macro cell and a cell (hereinafter referred to as "femtocell") composed of base stations with low transmission power are arranged to coexist. In such a network, when the macro cell and the pico cell operate on the same frequency, a problem of interference from the macro cell to the pico cell arises. That is, in a mobile station connected to a base station of a picocell (hereinafter referred to as a "pico base station"), a signal from a pico base station receives a signal from a base station of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04L5/00H04W72/08H04W84/04
CPCH04W84/045H04L5/0048H04L5/0053H04L5/0094H04W72/27H04W72/20H04W72/541H04W76/20H04W16/16H04W28/16
Inventor 实川大介田中良纪
Owner FUJITSU CONNECTED TECH LTD
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