Patent ID: 7310519
Filing Date: 2007-12-18
Classification: G06F,H04W,Y02D

Abstract:
1. A wireless communication network which is handover-possible, the wireless communication network comprising: a base station apparatus communicating between a wireless terminal and a wired communication network by using multiple wireless communication paths having different frequencies; a control device for controlling the base station apparatus, said control device having a handover unit for selecting one or multiple signals in accordance with the state of radio waves from signals received through multiple definable communication paths and communicating with the base station apparatus; and a network management device for managing the wireless communication network, wherein the network management device: has a memory storing, in accordance with a device identifier for identifying the base station apparatus, the number of call connections in the base station apparatus, a group information including an identifier of a group that the base station apparatus belongs to and/or an identifier indicating that the base station apparatus does not belong to any group; selects the base station apparatus having the number of call connections at a minimum or equal to or lower than a predetermined number from the base station apparatus not belonging to any base station apparatus groups with reference to the memory and creates a base station apparatus group; and sends software to upgrade and an upgrade request to the base station apparatus, and wherein the base station apparatus: receives the software and upgrade request sent from the network management device, selects at least one of multiple frequencies sequentially in accordance with the received upgrade request, and changes a state of transmission waves of the selected frequency such that a communication path in which a communication service is currently being provided can be switched by the control device to another communication path through another base station apparatus by performing handover, upgrades defined software to the received software, and returns the state of the transmission waves to the state existing before the change after the software upgrading.