Toward the Coexistence of 5G MmWave Networks with Incumbent Systems beyond 70 GHz

Abstract

Cellular networks are on the verge of enabling mobile millimeter-wave access beyond the traditional sub-6 GHz spectrum. Indeed, standardization of 5G-NR has already started, with an eye on enabling gigabit connectivity over 28 GHz and 39 GHz bands. Nevertheless, there remains a plethora of spectrum beyond these bands, and specifically at 70 GHz (71-76 GHz) and 80 GHz (81-86 GHz). A key issue in the aforementioned bands is the presence of licensed incumbent systems that provide point-to-point services. This article provides an overview of recent efforts toward the coexistence of 5G systems with these incumbents. Specifically, we analyze the 5G interference into incumbent receivers and present practical active and passive interference management techniques. We validate the 5G coexistence with detailed network simulations and show the feasibility of 5G connectivity beyond 70 GHz using an experimental prototype. Finally, we highlight future research venues for 5G coexistence with incumbent systems.