A method of operating a control node, the method comprising: determining a first direct mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by a direct mode communication from a first wireless terminal, located in a first base station coverage area, to a second wireless terminal (104; 106; 108; 110); determining a first infrastructure mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by an infrastructure mode communication from a first wireless terminal, located in a first base station coverage area, to a second wireless terminal (104; 106; 108; 110); determining a first mode of operation, said first mode of operation being one of said direct mode of operation and said infrastructure mode of operation as a function of said first direct mode system interference cost estimate and said first infrastructure mode system interference cost estimate; communicating to the first wireless terminal the determined first mode of operation to be used for communication from the first wireless terminal to the second wireless terminal (104; 106; 108; 110); determining a second direct mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by a direct mode communication from the second wireless terminal (104; 106; 108; 110) to the first wireless terminal; determining a second infrastructure mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by an infrastructure mode communication from the second wireless terminal (104; 106; 108; 110) to the first wireless terminal; determining a second mode of operation, said second mode of operation being one of said direct mode of operation and said infrastructure mode of operation as a function of said second direct mode system interference cost estimate and said second infrastructure mode system interference cost estimate; and communicating to the second wireless terminal (104; 106; 108; 110) the determined second mode of operation to be used for communication from the second wireless terminal (104; 106; 108; 110) to the first wireless terminal. determining a first direct mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by a direct mode communication from a first wireless terminal, located in a first base station coverage area, to a second wireless terminal (104; 106; 108; 110); determining a first infrastructure mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by an infrastructure mode communication from a first wireless terminal, located in a first base station coverage area, to a second wireless terminal (104; 106; 108; 110); determining a first mode of operation, said first mode of operation being one of said direct mode of operation and said infrastructure mode of operation as a function of said first direct mode system interference cost estimate and said first infrastructure mode system interference cost estimate; communicating to the first wireless terminal the determined first mode of operation to be used for communication from the first wireless terminal to the second wireless terminal (104; 106; 108; 110); determining a second direct mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by a direct mode communication from the second wireless terminal (104; 106; 108; 110) to the first wireless terminal; determining a second infrastructure mode system interference cost estimate for multiple coverage areas (118, 120, 122) which will be affected by an infrastructure mode communication from the second wireless terminal (104; 106; 108; 110) to the first wireless terminal; determining a second mode of operation, said second mode of operation being one of said direct mode of operation and said infrastructure mode of operation as a function of said second direct mode system interference cost estimate and said second infrastructure mode system interference cost estimate; and communicating to the second wireless terminal (104; 106; 108; 110) the determined second mode of operation to be used for communication from the second wireless terminal (104; 106; 108; 110) to the first wireless terminal.