2020/12/27 by Mohammed Almekhlafi, AL-Mekhlafi, Mohammed, Mohaned Chraiti +9 · 1 citation
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Cooperative Communication and Network Coding #FOS: Electrical engineering #Millimeter-Wave Propagation and Modeling #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2012.13923
openalex publication_date 2020/12/27 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Ultra Reliable and Low Latency Communications (URLLC) is deemed to be an\nessential service in 5G systems and beyond to accommodate a wide range of\nemerging applications with stringent latency and reliability requirements.\nCoexistence of URLLC alongside other service categories calls for developing\nspectrally efficient multiplexing techniques. Specifically, coupling URLLC and\nconventional enhanced Mobile BroadBand (eMBB) through superposition/puncturing\nnaturally arises as a promising option due to the tolerance of the latter in\nterms of latency and reliability. The idea here is to transmit URLLC packets\nover resources occupied by ongoing eMBB transmissions while minimizing the\nimpact on the eMBB transmissions. In this paper, we propose a novel downlink\nURLLC-eMBB multiplexing technique that exploits possible similarities among\nURLLC and eMBB symbols, with the objective of reducing the size of the\npunctured eMBB symbols. We propose that the base station scans the eMBB\ntraffic' symbol sequences and punctures those that have the highest symbol\nsimilarity with that of the URLLC users to be served. As the eMBB and URLLC may\nuse different constellation sizes, we introduce the concept of symbol region\nsimilarity to accommodate the different constellations. We assess the\nperformance of the proposed scheme analytically, where we derive closed-form\nexpressions for the symbol error rate (SER) of the eMBB and URLLC services. We\nalso derive an expression for the eMBB loss function due to puncturing in terms\nof the eMBB SER. We demonstrate through numerical and simulation results the\nefficacy of the proposed scheme where we show that 1) the eMBB spectral\nefficiency is improved by puncturing fewer symbols, 2) the SER and reliability\nperformance of eMBB are improved, and 3) the URLLC data is accommodated within\nthe specified delay constraint while maintaining its reliability.\n