Degrees-Of-Freedom in Multi-Cloud Based Sectored Cellular Networks.

摘要: This paper investigates the achievable per-user degrees-of-freedom (DoF) in multi-cloud based sectored hexagonal cellular networks (M-CRAN) at uplink. The network consists of N base stations (BS) and K ≤ band unit pools (BBUP), which function as independent cloud centers. communication between BSs BBUPs occurs by means finite-capacity fronthaul links capacities C F = μ · 1 2 log ( + P ) with denoting transmit power. In system model, have limited processing capacity BBU . We propose two different achievability schemes on dividing into non-interfering parallelogram clusters, respectively. minimum number users a cluster is determined ratio to BSs, r / Both are practically implementable beamforming adapt way forming clusters sectorization cells. Proposed coding improve sum-rate over naive approaches that ignore cell sectorization, both finite signal-to-noise (SNR) high-SNR limit. derive lower bound DoF , r. show cut-set attained for several cases, gap bounds decreases inverse BBUP-BS M irrespective achieved through clustering can not exceed any value long Since small moderate capacities, almost even sizes this range capacities. For higher always tight but capacity. However, bound, e.g., 5 6 be size.