2024/12/12 by Abdalla Hussein, Hussein, Abdalla, Patrick Mitran +3
Engineering · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Technologies #Wireless Body Area Networks
paper · pdf · doi:10.48550/arxiv.2412.09747
Motivated by the need to use spectrum more efficiently, this paper\ninvestigates fine grained spectrum sharing (FGSS) in Multi-User massive MIMO\n(MU-mMIMO) systems where a neutral host enables users from different operators\nto share the same resource blocks. To be accepted by operators, FGSS must i)\nguarantee isolation so that the load of one operator does not impact the\nperformance of another, and ii) avoid cross-subsidization whereby one operator\ngains more from sharing than another.\n We first formulate and solve an offline problem to assess the potential\nperformance gains of FGSS with respect to the static spectrum sharing case,\nwhere operators have fixed separate sub-bands, and find that the gains can be\nsignificant, motivating the development for online solutions for FGSS.\nTransitioning from an offline to an online study presents unique challenges,\nincluding the lack of apriori knowledge regarding the performance of the fixed\nsharing case that is required to ensure isolation and cross-subsidization\navoidance. We overcome these challenges and propose an online algorithm that is\nfast and significantly outperforms the static case.\n The main finding is that FGSS for a MU-mMIMO downlink system is doable in a\nway that is ``safe" to operators and brings large gains in spectrum efficiency\n(e.g., for 4 operators, a gain above 60 % is seen in many cases).\n