Читать книгу Intelligent Security Management and Control in the IoT - Mohamed-Aymen Chalouf - Страница 23

Depending on the needs of the application (data type, transmission urgency), the spectrum availability and the remaining battery life, the multicriteria decision-making module will select the most appropriate access network or radio channel to ensure transmission. This module considers both the energy constraints and the QoS and will be detailed in section 1.4.2.

To ensure decision stability, which is an important criteria (Wang et al. 2014), and to avoid inefficient or unhelpful transfer decisions in both the contexts considered (M-RAN or CRN), we suggest using a waiting time (timer) between the selection and execution stages. At the end of this time, the device checks that the following conditions are still valid: (1) the network/candidate channel is still detected by the object, and (2) this candidate’s score (network/channel) is still higher than that of the current network/channel. If these conditions are verified, then the transfer (network or channel) is run, otherwise it is canceled and the selection process restarts from the beginning.

As this wait can be an obstacle to continuity of service, a compromise needs to be found. So, we suggest adjusting this waiting time depending on the context of the decision.