Patent ID: 7292549

Claim:
A mobile radio terminal apparatus for use in a radio communication system wherein the system comprises a plurality of first base stations conducting radio communications in a first radio scheme using PN codes and a plurality of second base stations conducting radio communications in a second radio scheme using PN codes, the base stations synchronize with a common synchronous signal, different PN offsets are assigned to respective cells in which the base stations are arranged, a common PN offset is assigned to the base stations arranged in a common cell, and the first and second base stations conduct radio communications by using the PN offsets assigned respectively thereto, the terminal apparatus comprising: first cell detecting means for receiving radio signals of the first radio scheme by using various kinds of PN offsets and for detecting receiving levels of the respective cells; and second cell detecting means for receiving radio signals of the second radio scheme by using the PN offsets based on a result of the detection of the first cell detecting means and for detecting receiving levels of the respective cells.