5G micro-cell deployment in co-existence with fixed services

Abstract

This study deals with the coexistence between 5G networks and Fixed Services (FS), where fixed links (FL) is one application that is considered. To meet the demanding requirements of 5G systems, it is expected that 5G systems will require spectrum in high frequency bands. Most likely, these systems will have to share spectrum with fixed services. This thesis assesses the mutual interference between a micro-cell deployment and the fixed link, and examines the feasibility of the coexistence based on the interference requirements. The results indicate that the downlink (DL) interference that 5G generates towards the fixed link, surpasses the protection criteria for primary-secondary sharing in a co-channel case. However, the interference generated by the uplink (UL) transmission of the 5G system stays below the required threshold when an antenna array composed of 16 elements is used. In downlink (DL) communication, coexistence conditions were improved when lower transmit power was used. Thus, coexistence could be feasible in case the micro-layer was used only in UL. Frequency Division Duplexing (FDD) systems could be used in 5G communication systems to enable this feature.