| 摘要 |
PROBLEM TO BE SOLVED: To obtain the portable terminal device with high performance which allows a telephone communication to be carried on by switching base stations without operation by the user of the portable terminal even between the base stations where in-calling switching between the base stations is impossible by operating on the base station at a switching destination from the portable terminal. SOLUTION: A telephone communication is made between PHS terminals 1a and 1b through base stations by using radio and when in-calling switching among radio base stations 2a-2f is performed so as to continues a telephone communication by switching a 1st base station to a 2nd base station if a radio wave that the PHS terminus 1a and 1b are using during the telephone communication becomes worse, the said PHS terminals operates on the 2nd base station in response to a telephone call disconnection from the 1st base station to perform switching from the 1st base station to the 2nd base station. |
