A second User Equipment, hereinafter UE, for intercepting a signal of a first UE in a wireless infrastructure network, the second UE comprising: a first receiver, for intercepting a first uplink signal transmitted by the first UE, the first uplink signal being suitable for reception by a first base station, hereinafter BS, serving the first UE; a transmitter, for transmitting a second uplink signal suitable for reception by a second base station, hereinafter BS, serving the second UE; a second receiver, for receiving a first downlink signal from the second BS; and a processor, configured to: obtain interception-assistance information relating to the first uplink signal, at least a portion of said interception-assistance information originating from the first UE; control the first receiver to intercept the first uplink signal based on the interception-assistance information; and measure at least one characteristic of the first uplink signal, the processor being further configured to perform one of the following steps: use the measured characteristic to assist in the calculation of a position or a time; and send the measured characteristic to a remote electronic device, for use in assisting a calculation of a position or a time, and wherein the processor is configured to share interception-assistance information, relating to the second UE and/or the second uplink signal, with the first UE before the second uplink signal is transmitted to the second BS, to assist the first UE to intercept the second uplink signal. a first receiver, for intercepting a first uplink signal transmitted by the first UE, the first uplink signal being suitable for reception by a first base station, hereinafter BS, serving the first UE; a transmitter, for transmitting a second uplink signal suitable for reception by a second base station, hereinafter BS, serving the second UE; a second receiver, for receiving a first downlink signal from the second BS; and a processor, configured to: obtain interception-assistance information relating to the first uplink signal, at least a portion of said interception-assistance information originating from the first UE; control the first receiver to intercept the first uplink signal based on the interception-assistance information; and measure at least one characteristic of the first uplink signal, obtain interception-assistance information relating to the first uplink signal, at least a portion of said interception-assistance information originating from the first UE; control the first receiver to intercept the first uplink signal based on the interception-assistance information; and measure at least one characteristic of the first uplink signal, the processor being further configured to perform one of the following steps: use the measured characteristic to assist in the calculation of a position or a time; and send the measured characteristic to a remote electronic device, for use in assisting a calculation of a position or a time, use the measured characteristic to assist in the calculation of a position or a time; and send the measured characteristic to a remote electronic device, for use in assisting a calculation of a position or a time, and wherein the processor is configured to share interception-assistance information, relating to the second UE and/or the second uplink signal, with the first UE before the second uplink signal is transmitted to the second BS, to assist the first UE to intercept the second uplink signal.