Patent ID: 7447497

Claim:
A base station apparatus for communicating with a wireless terminal and a wired communication network within a wireless communication network which is capable of soft handover, the base station apparatus comprising: a wireless interface for communicating with the wireless terminal; a wired interface for communicating with the wired communication network; a communication processing portion for performing processing for providing communication services to the wireless terminal through the wireless interface and the wired interface; and a control portion for controlling said base station apparatus, wherein the control portion receives a control signal to prohibit performing a service stopping operation from a network management device which transmits and receives control signals for operation or maintenance of the wireless communication network and which transmits the control signal to prohibit performing the service storing operation to base station apparatuses adjacent to a base station apparatus in which software will be upgraded, and wherein when the control portion receives an upgrading request which is transmitted from the network management device to the base station apparatuses in which software will be upgraded, at a state in which performing the service storing operation is forbidden, the control portion: reduces output power of the transmission wave of the wireless interface such that a cell covered by the base station apparatus does not overlap with the other cells covered by adjacent base station apparatuses, thereby causing a soft handover such that all communication paths in which the communication service is being provided are switched to the communication paths of the adjacent base station apparatuses, after determining that no calls are connected to the base station apparatus or a sector of the base station apparatus, upgrades software set therein to software received through the wired interface in advance, and returns the transmission wave of the wireless interface to its original state after the software has been upgraded.