Multimode access control method and multimode mobile station

Abstract

In a multimode mobile station capable of communicating with a plurality of cellular systems where a current cellular system which the mobile station has acquired and a cellular system which the mobile station tries to access differ, access-failure information is stored at access failure time. The access-failure information includes any one of, or the combination of information on access failure such as access-system type, access time information, access location information, access failure reason, number of access failures, etc. Since an access cellular system is selected on the basis of the stored access-failure information, even when a current cellular system which the mobile station has acquired and a cellular system which the mobile station tries to access differ, it is possible to shorten re-acquisition time and to reduce power consumption.

Dependencies are inferred from the claim text.