Interference Analysis for Compatibility Evaluation between Aeronautical Earth Station in Motion and 5G Mobile Communications

Abstract

Earth station in motion(ESIM), an advanced satellite communications technology, is mounted on ships, aircraft, and land vehicles to provide broadband communication to passengers. It is considered for service in the 27.5～29.5 GHz band, this band is adjacent to the 24.25～27.5 GHz 5G candidate band. Therefore, compatibility between the ESIM and the 5G system must be evaluated. In this study, interference analysis from an aeronautical ESIM(A-ESIM) to a 5G system is performed by applying the minimum coupling loss method. When fuselage loss of the aircraft is not considered, the A-ESIM should be operated at an altitude of approximately 3,180 m to meet the criteria for allowable interference of the 5G system.

Evaluation of adjacent channel interference from land-earth station in motion to 5G radio access network in the Ka-frequency band

“…Unwanted emission is unwanted radio wave radiations in unwanted bands other than the designed frequency band of the transmitter. Due to this, the radio system operating in the adjacent frequency band is subjected to interference, which can be expressed as [ 6 ]: I ACI (dBW) = E ESIM + G r -L p -L A -L ACIR where E ESIM is the effective isotropic radiated power in dBW/40 KHz, G r is the receiver gain of 5G, L A is additional loss of 5G such as Ohmic loss and body loss. Ohmic loss is due to a drop in voltage across 5G cells during the passing of current due to the cells' internal resistance.…”

“…Unwanted emission is unwanted radio wave radiations in unwanted bands other than the designed frequency band of the transmitter. Due to this, the radio system operating in the adjacent frequency band is subjected to interference, which can be expressed as [6]:…”

“…In [ 5 ], the ACI from M-ESIM to 5G was studied, and numerical simulation result showed a minimum separation distance of 27 km that was required between these systems considering the worst-case scenario. Also, authors in [ 6 ] considered the effect of ACI on 5G BS and UE from an A-ESIM using the MCL method. In their study, two simulation cases were considered: A-ESIM with fuselage loss and without fuselage loss.…”

Adjacent Channel Compatibility Evaluation and Interference Mitigation Technique Between Earth Station in Motion and IMT-2020

“…In this study, interference analysis is performed when the aircraft is operating in the air, and the minimum altitude that can coexist with the IMT-2020 is derived. The same interference scenario is considered in [25], where a constant FDR value independent of the guard band is adopted. In contrast, the FDRs of three waveforms proposed in Section V are considered in this study.…”

“…Fig. 12 presents the maximum visible path according to the altitude of the A-ESIM [25]. Similar to the M-ESIM and L-ESIM scenarios, the received antenna gain of the BS calculates the element gain according to the position of the A-ESIM considering the downward tilt of the antenna, and applies the maximum value to the array gain.…”