Patent ID: 7640013

Claim:
A wireless communication system comprising: a plurality of base station apparatuses for transmitting and receiving a signal by radio with a terminal; a control device for controlling the plurality of base station apparatuses; and a network management device for controlling and managing the plurality of base station apparatuses and the control device, wherein the network management device selects, from among the plurality of base station apparatuses, a first base station apparatus in which software will be upgraded and a plurality of second base station apparatuses having a service area adjacent to or overlap with a service area of the first base station apparatus, causes, through the control device, sending of an instruction to prohibit performing a service stopping operation to each of the second base station apparatuses, thereby prohibiting said each of the second base station apparatuses to perform a service stopping operation, reducing transmission power from the first base station apparatus to the terminal, setting a first communication path between the terminal and the control device through the first base station apparatus and a second communication path between the terminal and the control device through one of the second base station apparatuses, and switching the first communication path between the terminal and the control device through the first base station apparatus to the second communication path between the terminal and the control device through one of the second base station apparatuses, and after the switching, causes upgrading software set in the first base station apparatus to software transmitted through the control device.