| 摘要 |
A mobile communication system actualizing a handoff is constructed by a mobile station (21), a first base transceiver station (11) having a first radio communication area of a CDMA system, a second base transceiver station (31) having a second radio communication area of a non-CDMA system, receiver stations (41) and a base station controller (51). Herein, the mobile station travels from the first radio communication area to the second radio communication area while communicating with the first base transceiver station. When the mobile station detects an event that an Ec/Io value of a pilot signal transmitted thereto from the first base transceiver station exceeds a first threshold value, the base station controller determines the receiver stations which are located adjacent to the second base transceiver station. Then, the base station controller requests the receiver stations to receive uplink traffic signals respectively transmitted from the mobile station. Within the receiver stations, the base station controller selects a receiver station receiving the uplink traffic signal having a best Eb/No value, which is compared with a second threshold value. When it exceeds the second threshold value, the base station controller requests the mobile station to perform hard handoff from the first base transceiver station to the second base transceiver station while simultaneously requesting the second base transceiver station to enable handoff. Thus, it is possible to broaden the radio communication area of the CDMA system in a direction toward the service area of the non-CDMA system at a hard handoff mode. <IMAGE> |
