Use of secondary radio to avoid measurement gap on primary air interface connection

A user equipment device (UE) comprising:

• a first radio supporting air-interface communication with a wireless communication system, wherein the first radio operates according to a first radio access technology (RAT);
• a second radio supporting air-interface communication with the wireless communication system, wherein the second radio operates according to a second RAT different than the first RAT,
• wherein the first radio is configured to carry out operations when the first radio has a first air-interface connection with an access node on a first carrier and the first radio is engaging in interruptive-sensitive air-interface communication over the first air-interface connection on the first carrier, the operations including (a) receiving from the access node a directive for the first radio to report to the access node the UE being within coverage of a second carrier different than the first carrier, and (b) responsive to the directive and to the first radio engaging in the interruptive-sensitive air-interface communication over the first air-interface connection on the first carrier, signaling to the second radio to cause the second radio, rather than the first radio, to conduct scanning for the coverage of the second carrier, and
• and wherein the first radio is configured to report over the first carrier to the access node a result of the scanning by the second radio,
• whereby scanning by the second radio, rather than the first radio, for coverage on the second carrier helps to avoid a measurement gap interrupting service of the first radio on the first carrier.