# Oceania's 5G Multi-Tier Fixed Wireless Access Link's Long-Term Resilience and Feasibility Analysis
###### Abstract
While adopting the mmWave bands for 5G results in better bandwidth, it also has limited coverage that can only be surpassed by a significant network densification that involves widely dispersed remote radio units (RRUs) throughout the area of interest. There is no doubt that this results in greater installation and maintenance costs. The use of sub-6 GHz RRUs, on the other hand, results in greater network coverage and, as a result, reduced costs, but this comes with a restriction on network bandwidth because sub-6 GHz bands operate with a constrained bandwidth. The two main categories of cell deployment designs are solo and heterogeneous systems. When discussing 5G, \"former\" means a network deployment with only mmWave small cells, while \"latter\" refers to  
Figure 1: The use of 5G wireless communication network for sustainability presents numerous upcoming real-life applications. deploying mmWave small cells on existing macro-relay networks using hierarchical or mixed cell architectures. The mmWave small cells could significantly boost the system capacity because of their much wider bandwidth, beamforming and MIMO capabilities, and shorter access link distances. In this article, we will be discussing a network design that involves the use of urban macro-cell (UMa) RRUs, also referred to as MRRUs, in the sub-6 GHz spectrum. These antennas are deployed in areas that are not covered by mmWave urban micro-cell (UMi) RRUs, also known as mRRUs, which provide high data rates within short distances. UMa antennas, on the other hand, offer extended coverage over longer distances. Therefore, to meet the coverage and bandwidth requirements, the MRRUs and mRRUs must be properly positioned. The suggested architecture examines the trade-off between (a) widespread MRRUs deployment, which improves quality of service (QoS) and lowers installation costs, and (b) sparse mRRUs deployment, which improves QoS but increases implementation costs. Our study aims to establish a hybrid technique that satisfies user traffic requirements and coverage constraints during the planning process. The technique will determine the minimal number and best locations of necessary MRRUs and mRRUs to be placed in a region of interest. We then take the following actions to accomplish this:  
* Parameters and user need identification: For a certain geographic area, we first identify the proper system parameters and user needs. The latter can be divided into numerous subareas with various user densities and distributions. We rely on the 3 GPP standard and employ Frequency Range 1 (FR1), or 6 GHz, and Frequency Range 2 (FR2), or 28 GHz, to design for MRRUs and mRRUs [13]. * Initial MRRU and mRRU counts: Preliminary coverage and cell capacity dimensioning stages are carried out once the relevant system parameters have been defined to determine the starting number of MRRUs and mRRUs that can each provide the requisite QoS. * Downlink and Uplink data rates: The MRRUs and mRRUs will then work together to establish their ideal placements to achieve the requisite coverage and downlink (DL) and uplink (UL) data rates. * Eliminating redundant MRRUs and mRRUs: Finally, a method that iteratively removes unnecessary MRRUs and mRRUs while maintaining the required level of coverage and providing a data rate for each subarea is intended.