Mobile telephone with handoff between microcell and macrocell based on past moving speed

Abstract

A mobile telephone capable of calling using a first calling system such as a personal handyphone system of being hand-off disabling at a moving speed more than the predetermined moving speed of the mobile telephone and a second calling system such as a personal digital cellular system of being hand-off enabling irrespective of the predetermined moving speed. A speed detector detects the moving speed of the mobile telephone itself, and a record holder stores the moving speed for a past predetermined time, detected by the speed detector. A central processing unit controls the calling using the first and second calling systems on the basis of the moving speed for the past predetermined time, resulting in improving reliability of line connection during moving, further improving using efficiency of the mobile telephone, and carrying out a more precise detection of a moving speed of the mobile telephone.

Dependencies are inferred from the claim text.