We address QoS guarantees in a Bluetooth piconet by considering mainly two constraints: the packet deadline and its priority. We evaluate the performances of four intra piconet scheduling schemes: one round robin (1-RR), exhaustive round robin (ERR), limited round robin (LRR) and deficit round robin (DRR), each one combined with our previously proposed local scheduling scheme FP/EDF. We show that DRR gives better performances than the three other schemes. Thus, we propose a new DRR based scheme called PBDRR that takes into consideration the priority of packets. Results have shown that PBDRR performs better than DRR in terms of miss probability.