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To support Ultra-Reliable and Low Latency Communications (URLLC) is anessential character of the 5th Generation (5G) communication system. Unlike theother two use cases defined in 5G, e.g. enhanced Mobile Broadband (eMBB) andmassive Machine Type Communications (mMTC), URLLC traffic has strict delay andreliability requirement. In this paper, an analysis model for URLLC traffic isproposed from the generation of a URLLC traffic until its transmission over awireless channel, where channel quality, coding scheme with finite codinglength, modulation scheme and allocated spectrum resource are taken intoconsideration. Then, network calculus analysis is applied to derive the delayguarantee for periodical URLLC traffic. Based on the delay analysis, theadmission region is found under certain delay and reliability requirement,which gives a lower bound on required spectrum resource. Theoretical results inthe scenario of a 5G New Radio system are presented, where the SNR thresholdsfor adaptive modulation and coding scheme selection, transmission rate anddelay, as well as admission region under different configurations arediscussed. In addition, simulation results are obtained and compared withtheoretical results, which validates that the admission region derived in thiswork provides a lower spectrum allocation bound.

Study on MCS Selection and Spectrum Allocation for URLLC Traffic under Delay and Reliability Constraint in 5G Network