Abstract
Heterogeneous networks (HetNets) are regarded as a promising approach to handle the deluge of mobile data traffic. With the co-channel deployment of small cells, the coverage and capacity of the network will be improved. However, the conventional maximum-received-power (MRP) user association scheme and cross-tier interference issue significantly diminish the performance gain provided by small cells. In this paper, we propose a novel location-aware cross-tier cooperation (LA-CTC) scheme for jointly achieving load balancing and interference mitigation in two-tier HetNets. In detail, we define an inner region for each macro base station (MBS) where the femto base stations (FBSs) will be deactivated, and thereby the users within the inner region will only be served by the MBS. Subsequently, for the users located in the outer region, the proposed scheme only uses coordinated multipoint (CoMP) transmission by two tiers of BSs to eliminate the excessive cross-tier interference suffered by offloaded users, whereas users with good locations are served directly by either a MBS or a FBS. Using tools of stochastic geometry, we derived the analytical expressions for the coverage probability and average rate of a randomly chosen user. Meanwhile, the analytical results were validated through Monte Carlo simulations. The numerical results show that the proposed scheme can improve the performance of networks significantly. Moreover, we compare the performance of the proposed scheme with that of the conventional MRP scheme, the cell range expansion (CRE) scheme and the location-aware cross-tier CoMP transmission (LA-CTCT) scheme in the literature. Numerical comparisons revealed that the proposed LA-CTC scheme outperforms the other three schemes.
Highlights
The deployment of multi-tier network architecture, namely heterogeneous networks (HetNets), is a promising approach to handle the exploding data traffic demands of users [1,2]
The large transmit power disparity of macrocells and small cells will lead to unbalanced user loads among different base stations (BSs) [4]; that is, most users will prefer to associate with macro base station (MBS) when the conventional maximum-received-power (MRP) user association scheme is applied
We present the numerical results of the coverage probability and average rate for the proposed location-aware cross-tier cooperation (LA-CTC) scheme, which can provide guidelines for the practical system design
Summary
The deployment of multi-tier network architecture, namely heterogeneous networks (HetNets), is a promising approach to handle the exploding data traffic demands of users [1,2]. The large transmit power disparity of macrocells and small cells will lead to unbalanced user loads among different BSs [4]; that is, most users will prefer to associate with MBSs when the conventional maximum-received-power (MRP) user association scheme is applied. This results in an underutilization of resource utilization at small cells. To cope with this problem, the biased user association, known as the cell range expansion (CRE) scheme, has been proposed [5], wherein the macro users are proactively offloaded to small cells.
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