Abstract
Massive multiple-input multiple-output (MIMO) has been a key technology in 5G New Radio (NR) standard, which empowers significant system performance improvement in previous 5G NR Releases. To support higher data rate and multi-user simultaneous transmission in downlink, enhancement in massive MIMO is essential for NR Release 18 (Rel-18). In this article, we explore performance requirements, challenges, and potential technologies for MIMO enhancement. First, we summarize major performance requirements for MIMO in Enhanced Mobile Broadband scenario. Based on these requirements, we identify three critical challenges of MIMO enhancement for single transmission reception point (TRP) and multiple TRPs scheme, in which we highlight the promising coherent joint transmission (CJT) technique. For each challenge, we present specific description from requirement perspective and technique perspective, evaluate the pros and cons of potential solutions, and carry out simulations to illustrate the potential performance gain. Some insights on how to solve these challenges to enhance massive MIMO performance in NR Rel-18 are also provided.
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