Volume 11, Number 16, October 2021

The Optimized Cell Configuration Method of Avoiding SRS Inter-Cell Interference

  Authors

Shin-Hwan Kim¹, Kyung-Yup Kim¹, Jae-Hyung Koo² and Young-Soo Seo³, ¹Access Network Technology Team, Korea, ²Access Network Technology Department, Korea, ³Network Research Technology Unit, Korea

  Abstract

The issue of cell-to-cell interferences is a serious problem that has always been raised in digital communication system such as NR. The communication method of NR and LTE is OFDM. OFDM has many advantages, but has fatal disadvantage called ICI (Inter-Cell Interference) because resources among cells are always overlapped. For example, NR’s typical interferences are ICIs among PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), CSI-RS (Channel State Information-Reference Signal) and SRS (Sounding Reference Signal). Among them, it is important to determine the correct beamforming weight factor value by estimating the channel with SRS. Therefore, the ICI of SRS degrades the performance of downlink throughput. This paper analyses the impact of SRS’s ICI in conventional scheme, introduces the proposed AC-CS (Auto-Correlation Cyclic Shift) schemes by the Zadoff-Chu sequence to overcome the ICI of SRS and analyses theirs performance. The method used for performance analysis is determined by the detection abilities, which are missing probability and false alarm probability.

  Keywords

SRS, beamforming, auto-correlation, missing probability, false alarm probability.