Method for operating an internet-of-things system using an internet-of-things performance management system, wherein the internet-of-things system comprises a plurality of internet-of-things communication devices in a communication network that provides radio coverage in a predetermined geographical area, and - by means of transmission of internet-of-things payload data from the internet-of-things communication devices, respectively, to the communication network and/or from the communication network to the internet-of-things communication devices, respectively - the internet-of-things system provides an internet-of-things service, wherein each of the internet-of-things communication devices comprises a performance management client functionality and operates according to configuration information of a respective performance vector dataset (201, 202), wherein the performance vector dataset (201, 202) is adapted to the internet-of-things communication device, respectively, and its respective environment or situation and/or is iteratively adapted or able to be iteratively adapted, wherein, in order to operate a specific internet-of-things communication device, the method comprises the following steps: -- in a first step, transmitting a first downlink performance vector dataset, triggered by the internet-of-things performance management system, towards the specific internet-of-things communication device, -- in a second step, transmitting a first uplink performance vector dataset, by the specific internet-of-things communication device, towards the internet-of-things performance management system, wherein the first uplink performance vector dataset comprises performance feedback information regarding the specific internet-of-things communication device and its operation, wherein at least a second downlink performance vector dataset is transmitted, triggered by the internet-of-things performance management system, towards the specific internet-of-things communication device, wherein the second downlink performance vector dataset comprises, compared to the first downlink performance vector dataset, different configuration information. wherein each of the internet-of-things communication devices comprises a performance management client functionality and operates according to configuration information of a respective performance vector dataset (201, 202), wherein the performance vector dataset (201, 202) is adapted to the internet-of-things communication device, respectively, and its respective environment or situation and/or is iteratively adapted or able to be iteratively adapted, wherein, in order to operate a specific internet-of-things communication device, the method comprises the following steps: -- in a first step, transmitting a first downlink performance vector dataset, triggered by the internet-of-things performance management system, towards the specific internet-of-things communication device, -- in a second step, transmitting a first uplink performance vector dataset, by the specific internet-of-things communication device, towards the internet-of-things performance management system, -- in a first step, transmitting a first downlink performance vector dataset, triggered by the internet-of-things performance management system, towards the specific internet-of-things communication device, -- in a second step, transmitting a first uplink performance vector dataset, by the specific internet-of-things communication device, towards the internet-of-things performance management system, wherein the first uplink performance vector dataset comprises performance feedback information regarding the specific internet-of-things communication device and its operation, wherein at least a second downlink performance vector dataset is transmitted, triggered by the internet-of-things performance management system, towards the specific internet-of-things communication device, wherein the second downlink performance vector dataset comprises, compared to the first downlink performance vector dataset, different configuration information.