A method performed by a mobile communication device , comprising: performing, by the mobile communication device , wireless communication, the wireless communication comprising a first communication using a 5G communication protocol for communicating with an external device; the method characterised by : determining , by the mobile communication device , whether a data throughput of the wireless communication is greater than a designated reference value, while the data throughput of the wireless communication is maintained greater than the designated reference value, continuing to perform the first communication using the 5G communication protocol for communicating with the external device and monitoring a temperature of the mobile communication device , and performing , by the mobile communication device , a handover from the first communication using the 5G communication protocol for communicating with the external device to a second communication using a 4G communication protocol for communicating with the external device to control heat generation due to high-speed communication through the handover based at least in part on the monitored temperature being higher than a designated reference temperature and the monitored data throughput being greater than the designated reference value. performing, by the mobile communication device , wireless communication, the wireless communication comprising a first communication using a 5G communication protocol for communicating with an external device; the method characterised by : determining , by the mobile communication device , whether a data throughput of the wireless communication is greater than a designated reference value, while the data throughput of the wireless communication is maintained greater than the designated reference value, continuing to perform the first communication using the 5G communication protocol for communicating with the external device and monitoring a temperature of the mobile communication device , and performing , by the mobile communication device , a handover from the first communication using the 5G communication protocol for communicating with the external device to a second communication using a 4G communication protocol for communicating with the external device to control heat generation due to high-speed communication through the handover based at least in part on the monitored temperature being higher than a designated reference temperature and the monitored data throughput being greater than the designated reference value. determining , by the mobile communication device , whether a data throughput of the wireless communication is greater than a designated reference value, while the data throughput of the wireless communication is maintained greater than the designated reference value, continuing to perform the first communication using the 5G communication protocol for communicating with the external device and monitoring a temperature of the mobile communication device , and performing , by the mobile communication device , a handover from the first communication using the 5G communication protocol for communicating with the external device to a second communication using a 4G communication protocol for communicating with the external device to control heat generation due to high-speed communication through the handover based at least in part on the monitored temperature being higher than a designated reference temperature and the monitored data throughput being greater than the designated reference value. <EOS>