Abstract
In multi-tier cellular/small cell networks, user performance is largely affected by the varying transmit powers, distances, and non- uniform traffic loads of different BSs in both the downlink (DL) and uplink (UL) directions of transmission. To optimize user performance in such networks, decoupled UL-DL association (DUDe) has recently been investigated. DUDe enables a user to be associated with different BSs for UL and DL transmissions. In this paper, we investigate the feasibility of DUDe in a full-duplex two-tier cellular network. Our objective is to associate users to their preferred BSs to maximize the overall user rate both in UL and DL with a provisioning for decoupled association. We formulate the UL and DL user association problem as a matching game where users and BSs rank one another using well-defined preference metrics such that their total UL and DL throughput is maximized. When compared to DUDe in half-duplex networks, in full-duplex networks it introduces new types of interferences such as UL to DL interference or DL to UL interference. The preference metrics are thus defined as a function of achievable UL and DL signal-to- interference noise ratio (SINR). Simulation results are presented to compare the performance of the proposed user association scheme with those of the traditional DUDe and coupled user association schemes where simple user association criteria (e.g., path-loss in the UL and received signal power in the DL) are used for UL and DL transmissions.
Published Version
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