In a method for inter-frequency handover of a mobile station from forward and reverse links with a current base station of a wireless cellular system to new forward and reverse links usually with a new base station utilizing a CDMA modulation type, dropped calls are substantially eliminated by increasing spreading factor during the handover. The method comprises the steps of obtaining an expected interference profile for each node; and agreeing a synchronised transmission schedule between the nodes, where the expected interference profile of each node meets predetermined criteria. The transmitter and receiver are both powered by power regulation and filtering means connected to the respective device. A surface of the sealed capsule thus produces haptic effects on a contact surface.