Why is application reliability an issue for an ultra-reliable 6G network?

Ultra-Reliable Low Latency Communication (URLLC) requirements will continue to influence the future 6G network. While the 3GPP 5G System created a foundation for URLLC, its reliability mechanisms are purely connectivity oriented. Failure handling in the application layer is left to the application itself. In fact, from the mobile network perspective, anything outside the mobile network domain is considered as out of the scope of the 5G system. In this paper, we propose a novel Make-Before-Break-Reliability (MBBR) mechanism with application-network interaction and a new paradigm to detect the application server failures by the network and seamlessly transfer the communication session to the redundant application server in order to realize the ultra-reliable 6G network.