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In this paper, the authors analyze the advantages of Multi-Access (MA) systems in heterogeneous networks, where a Mobile Station (MS) can simultaneously access different non-interfering networks with different Radio Access Technologies (RATs). For this analysis, they consider the following problem: How many RATs should the MS connect to? First, the beneficial aspects of MA is demonstrated by a simplified example, and then, MA methods in multi-RAT systems are investigated in terms of the spectral efficiency. Through their analysis and simulations, it is shown that usage of 2-RAT MA is enough to obtain most of the advantages of MA (i.e., network diversity).
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