Abstract
Massive multiple-input-multiple-output (MMIMO) in the mmWave band is an essential technique to achieve the desired performance for 5G new radio (NR) systems. To employ mmWave MMIMO technology, an important challenge is maintaining seamless mobility to users because we need to consider beam-switching within a cell besides the handover between cells. For mobility management in 5G NR systems, 3GPP specified a beam-level-mobility scheme that includes beam pairing and maintenance between a transmitter (Tx) and receiver (Rx) pair. We propose a unific-measurement report based mobility management scheme for improved radio-link-failure (RLF) rate and the accuracy of the Tx-Rx-beam-pair (TRP) selection with low overhead in 5G mmWave MMIMO networks where both handover and beam-switching are required. Furthermore, we modeled a finite-state-machine (FSM) for a user terminal to evaluate performance gain based on a system-level-simulation (SLS). We use the FSM-based Monte-Carlo SLS for the experiment and compare the performance of the proposed scheme with that of existing schemes in the scenario where both beam and cell-level-mobility are necessary. We show that the proposed scheme achieves an improvement in terms of the 3-dB loss probabilities representing the accuracy of the TRP selection, signal-to-interference-and-noise-ratio (SINR), and RLF rates with a lower signaling overhead compared to existing methods.
Highlights
Fifth-generation (5G) new radio (NR)—the first stage of the 5G systems—has led to various user-experience services, shorter latency, and higher user data traffic compared to the previous generation mobile communication systems such as LTE/LTE-A
We describe how to design a beam with the ULA antenna based on the active antenna array system (AAS) as shown in [29,30]
We proposed a mobility management scheme for 5G mmWave massive MIMO
Summary
Fifth-generation (5G) new radio (NR)—the first stage of the 5G systems—has led to various user-experience services, shorter latency, and higher user data traffic compared to the previous generation mobile communication systems such as LTE/LTE-A. These remarkable successes have been enabled by various techniques such as massive multiple-input-multiple-output (MIMO) systems and network slicing in various communication layer technologies [1,2]. To shape several beams using a massive number of antenna elements such as a uniform-linear-array (ULA) in the mmWave environment, a useful technique is mapping the one-logical port based on several antennas to a one-synchronization-symbol-burst (SSB) beam [5].
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