Method for reacting to disturbance in a mobile communication system

A method for reacting to disturbance on an uplink control channel in a digital trunked mobile communication system which includes a mobile communication network having a plurality of base stations maintaining a plurality of control channel pairs constituted by a plurality of uplink control channels respectively paired with a corresponding plurality of downlink control channels,

• a mobile services switching center, at least one mobile station arranged for signalling with a selected one of said base stations on a said control channel pair including a respective uplink control channel and a respective downlink control channel,
• said method comprising the steps of:
• (a) detecting by said mobile communication network of an instance of disturbance caused by intentional jamming on said respective uplink control channel;
• (b) informing said mobile station by said mobile communication network of said disturbance, by use of said respective downlink control channel;
• (c) commanding of said mobile station by said mobile communication network to a listening mode, in which said mobile station is forced to remain exceptionally on said respective downlink control channel and is prevented from searching for a new, non-jammed control channel, even though said mobile station fails to receive any response to uplink signalling transmitted by the mobile station to said selected one of said base stations on said respective uplink control channels, and shifting of said mobile station to said listening mode;
• and
• (d) transmitting information to said mobile station by said selected one of said base stations, and receiving said information by said mobile station, on said respective downlink control channel, while said mobile station is in said listening mode.