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This paper presents novel ultrareliable and low-latency communication (URLLC)techniques for URLLC services, such as Tactile Internet services. Among typicaluse-cases of URLLC services are tele-operation, immersive virtual reality,cooperative automated driving, and so on. In such URLLC services, new kinds oftraffic such as haptic information including kinesthetic information andtactile information need to be delivered in addition to high-quality video andaudio traffic in traditional multimedia services. Further, such a variety oftraffic has various characteristics in terms of packet sizes and data rateswith a variety of requirements of latency and reliability. Furthermore, sometraffic may occur in a sporadic manner but require reliable delivery of packetsof medium to large sizes within a low latency, which is not supported bycurrent state-of-the-art wireless communication systems and is very challengingfor future wireless communication systems. Thus, to meet such a variety oftight traffic requirements in a wireless communication system, noveltechnologies from the physical layer to the network layer need to be devised.In this paper, some novel physical layer technologies such as waveformmultiplexing, multiple access scheme, channel code design, synchronization, andfull-duplex transmission for spectrally-efficient URLLC are introduced. Inaddition, a novel performance evaluation approach, which combines a ray-tracingtool and system-level simulation, is suggested for evaluating the performanceof the proposed schemes. Simulation results show the feasibility of theproposed schemes providing realistic URLLC services in realistic geographicalenvironments, which encourages further efforts to substantiate the proposedwork.

Ultrareliable and Low-Latency Communication Techniques for Tactile Internet Services