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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: 2013-10-02
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
Comparison scheme
Effect test

Embodiment 1

[0046] 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

[0079] In Embodiment 2, an example in which TPC (Transmission Power Control: transmission power control) technology is applied to the wireless communication system in Embodiment 1 will be described. That is, in the scheduling unit 102 of the pico base station 100 according to the first embodiment, the interfered pico UE is scheduled only when the UE-specific SS overlaps with the interference reducing CCE. However, the leading position of the UE-specific SS differs for each mobile station, AL, and subframe, and the SS for AL most suitable for the radio channel state does not necessarily overlap with the interference reduction CCE.

[0080] Therefore, if an AL other than the most suitable AL for the radio channel state can be selected, the probability that the UE-specific SS overlaps with the interference reduction CCE will be higher. As a result, the chances of the interfered pico UE being scheduled increase, and thus an improvement in throughput can be expected. However, if a...

Embodiment 3

[0084] In Embodiment 3, an example in which the 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.

[0085] In this embodiment, in the masking control unit 203 of the macro base station 200 , how to determine whether to actually apply masking is a problem based on masking request signals notified from a plurality of pico base stations. As a criterion for this determination, for example, it is determined whether or not the number of pico base stations to which masking is requested exceeds a predetermined threshold.

[0086] 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 1...

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Abstract

This wireless communication system (1) controls the transmission timing in each cell in a manner so that the control channel of a first cell and the data channel of a second cell overlap temporally. The wireless communication system (1) has a first cell base station (100). The first cell base station (100) has a first control unit (100a) and a first communication unit (100b). The first control unit (100a) notifies a second cell base station of information used in identifying resources that are of the control channel of the first cell and that correspond to a predetermined resource unit. The first communication unit (100b) transmits a control signal to a first cell mobile station using a first resource that is of the first cell control channel, is to be decoded by the first cell mobile station, and corresponds to at least a portion of the predetermined resource unit.

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 Applications(China)
IPC IPC(8): H04W72/04H04W72/12
CPCH04W84/045H04L5/001H04L5/0048H04L5/0085H04L5/0094H04L5/0035H04W72/23H04W56/00H04W72/04H04W72/12H04W72/20
Inventor 实川大介田中良纪
Owner FUJITSU CONNECTED TECH LTD
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