A method for autonomous discovery of peak channel capacity in a wireless communication network, said method comprising the steps of: receiving a radio signal transmitted by a base station (120, 122) in a communication network at a mobile terminal in said communication network; and determining a RF signal metric of the radio signal received by the mobile terminal that quantifies the quality of said radio signal; said method characterized by the further steps of: determining a data throughput capacity associated with the radio signal received by the mobile terminal; determining an expected peak data throughput capacity for the mobile terminal based on the RF signal metric of the radio signal received from the base station (120, 122) by examining a data storage providing associations between values of said RF signal metric and peak data throughput capacity, said associations resulting from measurements of the RF signal metric, and corresponding estimations of peak data throughput capacities previously performed by the mobile terminal; and detecting congestion in the communication network if the data throughput capacity is less than the expected peak data throughput capacity, wherein the expected peak data throughput capacity is a data throughput the mobile terminal is expected to realize in communication with the base station (120, 122) based on the signal RF signal metric of the radio signal received by the mobile terminal from the base station (120, 122). receiving a radio signal transmitted by a base station (120, 122) in a communication network at a mobile terminal in said communication network; and determining a RF signal metric of the radio signal received by the mobile terminal that quantifies the quality of said radio signal; said method characterized by the further steps of: determining a data throughput capacity associated with the radio signal received by the mobile terminal; determining an expected peak data throughput capacity for the mobile terminal based on the RF signal metric of the radio signal received from the base station (120, 122) by examining a data storage providing associations between values of said RF signal metric and peak data throughput capacity, said associations resulting from measurements of the RF signal metric, and corresponding estimations of peak data throughput capacities previously performed by the mobile terminal; and detecting congestion in the communication network if the data throughput capacity is less than the expected peak data throughput capacity, wherein the expected peak data throughput capacity is a data throughput the mobile terminal is expected to realize in communication with the base station (120, 122) based on the signal RF signal metric of the radio signal received by the mobile terminal from the base station (120, 122). determining a data throughput capacity associated with the radio signal received by the mobile terminal; determining an expected peak data throughput capacity for the mobile terminal based on the RF signal metric of the radio signal received from the base station (120, 122) by examining a data storage providing associations between values of said RF signal metric and peak data throughput capacity, said associations resulting from measurements of the RF signal metric, and corresponding estimations of peak data throughput capacities previously performed by the mobile terminal; and detecting congestion in the communication network if the data throughput capacity is less than the expected peak data throughput capacity, wherein the expected peak data throughput capacity is a data throughput the mobile terminal is expected to realize in communication with the base station (120, 122) based on the signal RF signal metric of the radio signal received by the mobile terminal from the base station (120, 122).