Patent ID: 7668142
Filing Date: 2010-02-23
Classification: H04L

Abstract:
1. A system for radio communications, in which a radio terminal and a radio relay perform radio communications therebetween by a radio communications system using either a code division multiple access/frequency division duplex (CDMA/FDD) or a frequency division multiple access/frequency division duplex (FDMA/FDD), comprising: an interference measurer implemented to measure a degree of interference of each of radio slots constituting a radio channel employed in the radio communications system using either the CDMA/FDD or the FDMA/FDD; a decision maker implemented to make a decision, depending on a measurement result of the degree of interference, whether or not the radio communications by the radio communications system using either the CDMA/FDD or the FDMA/FDD is able to be continued; and a switcher implemented to switch, as the decision is made of the radio communications by the radio communications system to be unable to be continued, the radio communications system using either the CDMA/FDD or the FDMA/FDD to a radio communications system using either a time division multiple access/time division duplex (TDMA/TDD) or a code division multiple access/time division duplex (CDMA/TDD) or a frequency division multiple access/time division duplex (FDMA/TDD), wherein the switcher is implemented, upon the switching, to preferentially allot a radio slot having a smallest degree of interference measured by the interference measurer among the radio slots employed in the radio communications system using either the CDMA/FDD or the FDMA/FDD, as a radio channel employed in the radio communications system using either the TDMA/TDD or the CDMA/TDD or the FDMA/TDD.