Abstract
In order to support new scenarios, and also to improve the performance in frequency band below 6GHz, NR introduces several enhancements to MIMO technologies: more refined and more flexible channel state information (CSI) feedback, beam management, beam failure recovery (BFR), enhanced reference signal (RS), and multiple transmission and reception point (multi-TRP) cooperative transmission. Among them, reference signal design in NR basically reuses the design principles of LTE with some optimization, which will not be introduced in detail here. This chapter will focus on the new features of NR that are not supported in LTE, including CSI feedback enhancement (e.g., R15 type II codebook), beam management and BFR introduced in R15/R16, enhanced eType II codebook in R16, and multi-TRP transmission.
Published Version
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