Patent ID: 7773981

Claim:
A software upgrading method for base station apparatus in a wireless communication system which has a plurality of base station apparatuses having a plurality of sectors, a base station control device connected to the plurality of base station apparatuses to control the base station apparatuses, and a network management device maintaining and managing the base station apparatuses and the base station control device, the software upgrading method comprising the steps of: receiving an upgrading request to upgrade software from the network management device by one of the base station apparatuses, at a state in which a new software for upgrading has been transferred to the base station apparatus; and controlling each of the sectors by the base station apparatus, in response to receiving the upgrading request, such that one of the sectors no longer provides the communication services to perform a software upgrading processing and other sectors provide the communication services and, performing the software upgrading processing for each of the sectors sequentially, wherein, in the sector which performs the software upgrading processing, the step of controlling includes the steps of: requesting to reduce a transmission power of a wireless interface of the sector by a predetermined rate of the power reduction, reducing the transmission power in response to the request by the wireless interface, notifying the transmission power value after the transmission power reduction, determining, in accordance with the notification, if the notified transmission power value reaches a predetermined lowest value of the transmission power or not, further requesting, in a case that the transmission power value does not reaches the lowest value, to reduce the transmission power of the wireless interface by the predetermined rate of the power reduction, and finishing, in a case that the transmission power value reaches the lowest value, the reduction of the transmission power, performing a reset processing and a load processing of the new software for upgrading and, performing a processing of gradually increasing the transmission power, thereby performing the software upgrading processing.