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Base station, receiving device, mobile terminal, and frequency sharing method

A receiving device and base station technology, which is applied in the field of receiving devices and base stations, can solve the problems of not considering the frequency band transmission status, not considering the transmission parameters, and it is difficult to improve the efficiency of frequency use, etc.

Inactive Publication Date: 2009-04-01
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the first method, it is difficult to improve the frequency usage efficiency because the transmit power control is not flexibly performed according to the operating conditions of other systems
Moreover, it is theoretically difficult to apply the first method to a communication system that transmits signals with a relatively high transmission power in a wide area such as a cellular system
[0007] In the second method, no consideration is given to the emission conditions of frequency bands adjacent to frequency bands of other systems
And for the second method, it is difficult to effectively use frequency resources because it only determines whether the signal can be transmitted based on the surrounding conditions without considering the transmission parameters

Method used

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  • Base station, receiving device, mobile terminal, and frequency sharing method
  • Base station, receiving device, mobile terminal, and frequency sharing method
  • Base station, receiving device, mobile terminal, and frequency sharing method

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no. 1 approach

[0041] A wireless communication system according to a first embodiment of the present invention is described below with reference to FIG. 2 .

[0042] The wireless communication system 2000 of this embodiment is used in the same and / or near (adjacent) area as the area where the wireless communication system 1000 is used. Furthermore, as shown in FIG. 3 , the wireless communication system 2000 uses the same and / or close (adjacent) frequency band as the frequency band used by the wireless communication system 1000 .

[0043] In this embodiment, the wireless communication system 1000 represents an existing wireless communication system, and has priority over the wireless communication system 2000 . In the example shown in FIG. 2, the wireless communication system 1000 is represented by a satellite broadcasting system, and the wireless communication system 2000 is represented by a mobile communication system.

[0044] The wireless communication system 1000 includes a transmitting...

no. 2 approach

[0073] A wireless communication system according to a second embodiment of the present invention will be described below.

[0074] The configuration of the wireless communication system of this embodiment is basically the same as that described with reference to FIG. 2 . Also, the configuration of the base station 300 of this embodiment is basically the same as that described with reference to FIG. 4 .

[0075] In the first embodiment, the maximum transmission power is determined based on the distance between the receiving device 200 of the wireless communication system 1000 and the transmitting device of the base station 300 of the wireless communication system 2000 . However, in practice, as shown in FIG. 7 , the degree of influence exerted by the transmitting device of the base station 300 of the wireless communication system 2000 on the receiving device 200 of the wireless communication system 1000 depends on, for example, the height difference between the receiving device...

no. 3 approach

[0083] A wireless communication system according to a third embodiment of the present invention will be described below.

[0084] The configuration of the wireless communication system of this embodiment is basically the same as that described with reference to FIG. 2 . Also, the configuration of the base station 300 of this embodiment is basically the same as that described with reference to FIG. 4 .

[0085] In the above implementation manners, the maximum transmit power is determined based on the interference of spurious signals to the wireless communication system 1000 .

[0086] However, there are cases where the influence of out-of-band signals outside the operating frequency band received by the receiving apparatus 200 is greater than the influence of spurious signals within the operating frequency band. The effect of this out-of-band signal is called desensitization. Desensitization is a form of interference that occurs when non-linear elements of the receiving appar...

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Abstract

A disclosed base station is used in a first wireless communication system using a first frequency band that is the same as or adjacent to a second frequency band used by a second wireless communication system, and includes a propagation loss estimation unit configured to estimate propagation loss of a signal in the first frequency band when the signal arrives at a receiving device of the second wireless communication system; a frequency difference calculation unit configured to calculate a frequency difference between the first frequency band and the second frequency band; a maximum transmission power determining unit configured to determine maximum transmission power based on the estimated propagation loss and the calculated frequency difference; and a transmission control unit configured to transmit a signal with transmission power less than or equal to the maximum transmission power determined by the maximum transmission power determining unit.

Description

technical field [0001] The present invention relates generally to wireless communication systems. More specifically, the present invention relates to a base station, a receiving device, a mobile terminal and a frequency sharing method. Background technique [0002] We have known a method (hereinafter referred to as a first method) of sharing the same frequency band by a plurality of systems in short-distance communication using, for example, ultra wideband (UWB). In the first method, the transmission power of a system is limited to a lower level based on a transmission power mask statically determined according to the relationship with other systems sharing the same frequency band. [0003] We also know another method (hereinafter referred to as the second method) used eg in wireless wide area networks. In the second method, a terminal determines whether an allocated frequency band is used by a neighboring terminal before starting communication, and refrains from transmitt...

Claims

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Application Information

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IPC IPC(8): H04W52/24H04W52/26H04W16/14H04W72/04
CPCY02B60/50
Inventor 藤井启正吉野仁
Owner NTT DOCOMO INC
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