Abstract: An alert system for a communications network has a plurality of client devices and a plurality of alert servers each adapted to provide alerts to a respective subset of the client devices to provide scalability. Users at the client devices subscribe to receive alerts by selecting a scope of distribution of alerts. The selection involves selecting a type of alert to receive, a level of severity of alerts to receive, and a geographic scope. In response to receiving a request to issue an alert, an alert server notifies the other alert servers of the alert. Each alert server determines which client devices of the respective subset of client devices are to receive the alert. Each alert server then sends an alert message to its client devices that are to receive the alert.

Abstract: A real-time network-analysis system comprises a network appliance and a plurality of management devices. The network appliance continuously monitors an object network and synthesizes a current network image comprising contemporaneous indicators of connectivity, occupancy, and performance of the object network. A management-client device may gain access to the network image for timely control and for use in producing long-term network-evolution plans. To enable the creation of a real-time network image, optimized topology synthesis algorithms are devised to minimize the computational effort. The real-time network-analysis system is adapted for use with an object network employing a variety of routing protocols, such as link-state protocols, and network-management protocols, such as the Simple-Network-Management protocol.

Abstract: In a mobile cellular communication system, adjacent basestations BS1-BS4 are assigned different selections of different frequency channels to communicate with mobiles in their cells (10, etc.). To improve system quality and capacity, a basestation selects a frequency channel which is not assigned to it or any neighbour station, and makes test communications on that frequency channel with mobiles (e.g. MS1) in its cell. The basestation assesses the potential performance of that frequency channel, and neighbour basestations can monitor for potential interference on that frequency channel. The information so gathered can be analysed by an operations maintenance station OMC.

Abstract: A method for determining a handover for a mobile station in a multicellular communication system including the steps of measuring received signal parameters received from a serving cell and a plurality of neighboring cells, comparing received signal parameters with a variable threshold value for each of the plurality of neighbor cells, measuring the amount of time, or the number of times, the received signal parameters are above the threshold value for each of the plurality of neighbor cells, and determining handover based on the measurement.