Patent ID: 7133389
Filing Date: 2006-11-07
Classification: H04B,H04J,H04W

Abstract:
1. A radio communication method for a radio communication system employing CDMA (Code Division Multiple Access) for radio access and providing multi-rate transmission, the radio communication system including a base station controlling apparatus, a plurality of base stations, and a plurality of mobile stations, the radio communication method comprising the steps of: informing, by the base station controlling apparatus or by the one of the plurality of base stations, one of the plurality of mobile stations, that a first code being used by the one of the plurality of mobile stations is to be switched to a second code; transmitting timing information by message to the one of the plurality of mobile stations, said timing information regarding timing of switching from the first code to the second code; switching from the first code to the second code at the one of the plurality of mobile stations, said step of switching from the first code to the second code based on the step of informing and on the transmitted timing information; switching a spreading code from the first code to the second code at the one of the plurality of base stations in synchronization with switching from the first code to the second code at the one of the plurality of mobile stations, and transmitting a completion message from the one of the plurality of mobile stations to one of the plurality of base stations or to the base station controlling apparatus to indicate completion of the step of switching a spreading code from the first code to the second code at the one of the plurality of mobile stations.