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

We characterize the rate complementary cumulative distribution function (CCDF) fur 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 degrees or higher.