Inter-Operator Base Station Coordination in Spectrum-Shared Millimeter Wave Cellular Networks

Abstract

We characterize the rate complementary cumulative distribution function (CCDF) for a spectrum-shared millimeter wave downlink cellular network. Each of the multiple cellular operators owns separate mmWave bandwidth, but shares the spectrum amongst each other while using dynamic inter-operator base station (BS) coordination to suppress the resulting cross-operator interference. We model the BS locations of each operator as mutually independent Poisson point processes, and derive the probability density function (PDF) of the ${K}$ -th strongest link power, incorporating both line-of-sight and non line-of-sight states. Leveraging the obtained PDF, we derive the rate CCDF expression as a function of system parameters such as the BS density, transmit power, bandwidth, and coordination set size. We verify the analysis with extensive simulation results. A major finding is that inter-operator BS coordination is useful in spectrum sharing: 1) with dense and high power operators and 2) with fairly wide beams, e.g., 30° or higher.