Abstract
Dependability is a measure of availability and reliability of systems/services. In the context of communication systems, dependability is governed by the coverage probability of the network under prescribed service requirements, by the latency of data transmissions as well as by the transmission error probability. Achieving dependable connectivity can be very challenging, especially within wireless mobile communications, where the transmission channel is often prone to severe fading and strong interference. Current generations of cellular mobile communication systems (4G and below) can mainly provide best effort services and are not well equipped to achieve a sufficiently high level of dependability as required by many novel applications, such as, road-safety relevant information exchange in vehicular communications, as well as, wireless remote operation of robots and drones. Standardization bodies have already recognized the market potential of such use-cases for mobile communications, and correspondingly efforts are ongoing to enhance the fifth generation of cellular systems (5G) towards ultra-reliable low-latency transmission. In this paper, we provide insights gained by our research work within the Christian Doppler Laboratory for Dependable Wireless Connectivity for the Society in Motion with respect to factors influencing the dependability of 5G mobile cellular systems, and we present our achievements over the past two years for enhancing the robustness, reliability and efficiency of dependable wireless communications.
Highlights
The currently ongoing standardization of fifth generation (5G) wireless communications puts dedicated effort into enhancing the reliability and reducing the latency of mobile wireless communications within the Third Generation Partnership Project (3GPP) work task on ultra reliable low latency communications (URLLC) [1, 2]
The 5G mobile wireless communications standard will bring along a host of new technologies ranging from physical layer (PHY) up to the network layer (NET). 5G will see significant extensions of carrier frequencies from several hundred MHz up to tens of GHz into the so-called millimeter wave regime [4]
Theoretical results on FD-multiple-input multiple-output (MIMO) and massive MIMO systems promise order of magnitude spectral efficiency gains through highdegree spatial multiplexing under the assumptions that the transmitters are well informed about the current channel state and that users experience so-called favorable channel conditions [14]. The former assumption is hard to justify in high-mobility situations, where channel state information (CSI) varies quickly over time; we summarize below in Sect. 2.1 our insights on robust beamforming under CSI uncertainty at the transmitter
Summary
The currently ongoing standardization of fifth generation (5G) wireless communications puts dedicated effort into enhancing the reliability and reducing the latency of mobile wireless communications within the Third Generation Partnership Project (3GPP) work task on ultra reliable low latency communications (URLLC) [1, 2]. BSs will extensively feature spatially distributed active antenna systems to enhance macro-diversity of connections, to reduce the access distance of users, and to improve the coverage of the network [6].
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