Radio communications system and radio communications method

Abstract

The present invention makes up for shortages of a central control type and a distributed control type radio communications systems, not only restrains interference of radio stations using the same radio communications system, and also restrain the interference of the surrounding radio stations, thereby effectively using a frequency source. The radio communications system includes a radio station connecting with a network (a network connecting radio station) and a counterparty radio station. The network connecting radio station obtains information A of a radio communication status through the network and transmits to the counterparty radio station. The information A comprises using frequency information of the radio station and waveform characteristic quantity information indicating statistic properties of signal waveforms transmitted by the radio station. The counterparty radio station calculates a measured value of the waveform characteristic quantity of the signal received from another radio station and reports the measured value to the network connecting radio station aiming at each part of the announced waveform characteristic quantity. The network connecting radio station determines whether to communicate or not and a radio source according to the information A and the information reported by the counterparty radio station.

Description

technical field [0001] The present invention relates to a wireless communication system and a wireless communication method in an environment where there are a plurality of wireless stations sharing the same frequency. Background technique [0002] In current wireless communication, in many cases, dedicated frequency bands are assigned to each wireless communication system in order to avoid mutual interference. However, in recent years, methods of using the same frequency band in a plurality of communication systems have been studied in order to effectively use limited frequencies in wireless communication. In order for the same frequency band to be shared by a plurality of wireless stations or a plurality of wireless communication systems, it is necessary to recognize each other's frequency use status and perform transmission control so as not to cause interference. There are roughly two types of transmission control methods, which can be considered as: decentralized contr...

AI Technical Summary

Problems solved by technology

Therefore, in the case of radio resource control based on centralized control, there is a concern that there is a high possibility that the characteristics will deteriorate significantly

Specifically, in the method of the prior art Non-Patent Document 1, users are differentiated using spreading codes and share the same frequency. However, information such as spreading codes cannot always be used between wireless stations using different wireless communication systems. , worrying about not being able to avoid interference

In addition, in the method of suppressing interference by interference coordination for wireless stations at the cell end, it is considered that fine cell design cannot be performed in an assumed frequency sharing environment, and an area where significant characteristic degradation due to interference occurs

Furthermore, in the prior art method of Patent Document 1, the base station groups the mobile stations into groups based on reports of CQI information from the mobile stations, and allocates resources to each group. For CQI information sharing based on wireless signals, such grouping and appropriate resource allocation cannot be performed

Also in the method of Patent Document 2, it is considered that since resource allocation information cannot be shared in an assumed environment, resources that can avoid interference cannot be identified, and the characteristics are significantly deteriorated

In this way, the method of the centralized control type wireless communication system has the problem that it is highly complex in that a large amount of information is required, and it is difficult to share information between systems under conditions such as an environment where the same frequency band is shared between different wireless communication systems. Significantly deteriorated

Conversely, even though the wireless resource is not used, it is misjudged that the wireless resource is used, and the transmission is controlled by the wireless station, which is likely to cause a decrease in frequency utilization efficiency.

In this way, in the distributed control type wireless communication system, compared with the centralized control type wireless communication system, it is considered that interference can be avoided even in the case of insufficient information sharing. Although the processing complexity is low, the effect of avoiding interference and the frequency Utilization efficiency is not as good as centralized control wireless communication system

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