  The reliability of the increasing number of modern applications and systems
strongly depends on interconnecting technology. Complex systems which usually
need to exchange, among other things, multimedia data together with
safety-related information, as in the automotive or avionic industry, for
example, make demands on both the high bandwidth and the deterministic behavior
of the communication. TTEthernet is a protocol that has been developed to face
these requirements while providing the generous bandwidth of Ethernet up to
1\,Gbit/s and enhancing its determinism by the Time-Triggered message
transmission which follows the predetermined schedule. Therefore, synthesizing
a good schedule which meets all the real-time requirements is essential for the
performance of the whole system.
  In this paper, we study the concept of creating the communication schedules
for the Time-Triggered traffic while minimizing its makespan. The aim is to
maximize the uninterrupted gap for remaining traffic classes in each
integration cycle. The provided scheduling algorithm, based on the
Resource-Constrained Project Scheduling Problem formulation and the load
balancing heuristic, obtains near-optimal (within 15\% of non-tight lower
bound) solutions in 5 minutes even for industrial sized instances. The
universality of the provided method allows easily modify or extend the problem
statement according to particular industrial demands. Finally, the studied
concept of makespan minimization is justified through the concept of scheduling
with porosity according to the worst-case delay analysis of Event-Triggered
traffic.
