Capacity optimization for ultra-reliable low-latency communication in 5G — The SON perspective

Towards 5G, the challenge to achieve high reliability and low latency asks for new directions in systems so far strongly focusing on high data rates. Schemes to achieve high reliability for low latency demanding services are link diversity to ensure reliability and resource reservation to avoid scheduling delays. However, these schemes place high demands on the scarce radio resources. In this paper we propose a self-optimized approach on the network management level to minimize the capacity impact for ultra-reliable low latency communication (URLLC) services. The idea of the new URLLC Self-Organized Network (SON) is to provide optimized sets of parameters derived from the respective service requirements and the current conditions in the network. We discuss Network Management (NM) parameters regarding their impact on URLLC and present a structure, which allows a fast selection of the appropriate parameter set. One focus is on device-to-device (D2D) communication, which has a high potential to meet both, the reliability and latency requirements. An initial study on radio resource reuse indicates a promising gain in network capacity, while D2D reuses the same resources as the cellular users in the network.