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The cost-effective impact and fundamental limits of infrastructure supportwith rate-limited wired backhaul links (i.e., GreenInfra support), directlyconnecting base stations (BSs), are analyzed in a large-scale hybrid network ofunit node density, where multi-antenna BSs are deployed. We consider a generalscenario such that the rate of each BS-to-BS link scales at an arbitrary raterelative to the number of randomly located wireless nodes, $n$. For theoperating regimes with respect to the number of BSs and the number of antennasat each BS, we first analyze the minimum rate of each backhaul link,$C_{\textrm{BS}}$, required to guarantee the same throughput scaling as in theinfinite-capacity backhaul link case. We then identify the operating regimes inwhich the required rate $C_{\textrm{BS}}$ scales slower than $n^\epsilon$ foran arbitrarily small $\epsilon>0$ (i.e., the regimes where $C_{\textrm{BS}}$does not need to be infinitely large). We also show the case where our networkwith GreenInfra is fundamentally in the infrastructure-limited regime, in whichthe performance is limited by the rate of backhaul links. In addition, wederive a generalized throughput scaling law including the case where the rateof each backhaul link scales slower than $C_{\textrm{BS}}$. To validate thethroughput scaling law for finite values of system parameters, numericalevaluation is also shown via computer simulations.

GreenInfra: Capacity of Large-Scale Hybrid Networks With Cost-Effective Infrastructure