Soft deadline bounds for two-way transactions in Buetooth piconets under co-channel interference

This paper presents the delay performances of two-way transactions implemented on top of the Bluetooth HCI layer. The two-way transaction, formally called the Send Data with Acknowledge (SDA) service primitive, is a fundamental building block for real-time protocols. We analyze its delay performances under packet loss probability caused by a number of co-located interfering piconets. We first present a probabilistic treatment of the performance of a Bluetooth piconet under co-channel interference from other Bluetooth piconets. An upper bound on the packet error rate is analytically derived. Simulation results validating the theoretical results are shown. The obtained packet error rate bounds are then applied to the problem of deadline for two-way transactions. The probability that a deadline will be met is introduced, as well as the value of the deadline in function of the desired probability that the deadline will be met.