  Different scheduling mechanisms in Time Sensitive Networking (TSN) can be
integrated together to design and support complex architectures with enhanced
capabilities for mixed critical networks. Integrating Frame Preemption (FP)
with Credit-Based Shaper (CBS) and Gate Control List (GCL) opens up different
modes and configuration choices resulting in a complex evaluation of several
possibilities and their impact on the Quality of Service (QoS). In this paper,
we implement and quantify the integration of preemptive CBS with GCL by
incorporating FP into the architecture. Our experiments show that the
end-to-end delay of Audio Video Bridging (AVB) flows shaped by CBS reduces
significantly (up to 40\%) when AVB flows are set to preemptable class. We
further show that the jitter of Time Triggered (TT) traffic remains unaffected
in "with Hold/Release" mode. Furthermore, we propose to introduce Guardband
(GB) in the "without Hold/Release" to reduce the jitter of the TT flow. We
compare all the different integration modes, starting with CBS with GCL,
extending it further to FP. We evaluate all feasible combinations in both
synthetic and realistic scenarios and offer recommendations for practical
configuration methods.
