Research On Inter-piconet Interference Suppression Schemes For BTLE Networks Under Cellular-assisted

Bluetooth is a wireless data transmission technology, which provides short-range, low-cost and low power consumption communication among some devices such as UEs, person computers and other devices. At the present, the Bluetooth Low Energy (BTLE) technology achieves rapid development and application with the development of the Bluetooth standard. In some dense places such as airports, university campuses shopping malls, as there are lots of devices equipped with BTLE interfaces, there will be lots of BTLE piconets. Although each BTLE piconet adopts the adaptive frequency hopping technology to avoid packet interference, different piconets will also interfere with each other when using the same frequency at the same time. As there is no central coordinator managing all piconets in the same location, the severe packet collisions caused by different piconets cannot be mitigated well. So, how to mitigate the inter-piconet interference for the BTLE networks is an urgent problem need to be researched and solved.Firstly, the networking architecture, protocol model and adaptive frequency hopping technology of the Bluetooth standard are introduced. Secondly, the inter-piconet interference problem and the existing schemes are analyzed. At last, the converged architecture for the BTLE networks and the cellular network is introduced, and then two inter-piconet interference suppression schemes under cellular-assisted are proposed:1. In the converged scenario, the BS compares and calculates the frequency hopping sequences of all the BTLE piconets, gets the channels at which collide most, and excludes them in the further prediction. BS repeats the calculation process until the system collision probability is lower than a threshold. At the implementation phase, BS informs the related piconets of the bad channel index by the UE.2. In the converged scenario, the BS compares and calculates the frequency hopping sequences of all the BTLE piconets, gets the piconets which collide most with other piconets, and have their frequency hopping sequences transformed in the further prediction. BS repeats the calculation process until the system collision probability is lower than a threshold. At the implementation phase, BS informs the related piconets of the sequence transform functions by the UE.3. The MATLAB (Matrix Laboratory) simulate tool is used to evaluate the performance of the bad channel prediction scheme and frequency hopping sequence transform scheme, and the simulation results are compared and analyzed.