Fault-tolerant multimedia communication networks with QoS-based checkpoint protocol

Advanced computer and network technologies have lead to the development of computer networks. Here, an application is realized by multiple processes located on multiple computers connected to a communication network. Each process computes and communicates with other processes by exchanging messages through communication channels. Mission-critical applications are required to be executed fault-tolerantly. This paper proposes novel consistency of global checkpoints in multimedia communication networks. Unlike the conventional consistency, it allows for processes to take local checkpoints during communication events and to lose a part of a message in recovery. In addition, we show a checkpoint protocol based on the proposed consistency. The checkpoint protocol is nonblocking for supporting time-constrained applications. In addition, it is QoS-based where a QoS parameter is global consistency.