Journal
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume 34, Issue 5, Pages 1058-1072Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSAC.2016.2520218
Keywords
Green communication; small cell networks; cell association; cell load; throughput; stochastic geometry
Funding
- Ministry of Science and Technology of Taiwan [MOST 101-2218-E-006-011-MY3, MOST 104-2628-E-009-006-MY3, MOST 102-2221-E-009-012-MY3, MOST 103-2221-E-009-015-MY2, MOST 104-2622-8-009-001]
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This paper thoroughly explores the fundamental interactions between cell association, cell load, and throughput in a green (energy-efficient) small cell network in which all base stations form a homogeneous Poisson point process (PPP) of intensity lambda(B) and all users form another independent PPP of intensity lambda(U). Cell voidness, usually disregarded due to rarity in cellular network modeling, is first theoretically analyzed under generalized (channel-aware) cell association (GCA). We show that the void cell probability cannot be neglected any more since it is bounded above by exp(-lambda(U)/lambda(B)) that is typically not small in a small cell network. The accurate expression of the void cell probability for GCA is characterized and it is used to derive the average cell and user throughputs. We learn that cell association and cell load lambda(U)/lambda(B) significantly affect these two throughputs. According to the average cell and user throughputs, the green cell and user throughputs are defined respectively to reflect whether the energy of a base station is efficiently used to transmit information or not. In order to achieve satisfactory throughput with certain level of greenness, cell load should be properly determined. We present the theoretical solutions of the optimal cell loads that maximize the green cell and user throughputs, respectively, and verify their correctness by simulation.
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