Abstract
In this paper, we aim to address the cross-layer interference in the heterogenous cellular network (HetNet). In order to exploit the overlapping characteristics of the HetNet coverage and achieve a good trade-off between the interference coordination gain and the cost, an area-classified interference coordination strategy is first proposed. The basic idea is that coverage of the HetNet is classified into four different areas such that area-specific interference coordination can be used to increase the cross-layer cooperation efficiency. A new steepest slope method based on relative cooperation gain is proposed to realize efficient area classification. Then, a coordinated beamforming scheme based on area-specific limited feedback is proposed to examine the effectiveness of this new strategy. It is shown that the proposed scheme could increase the success rate of user pairing and thus improve the throughput performance, with reduced feedback overhead in contrast to existing schemes. Its effectiveness is finally verified via numerical simulations.
Highlights
Driven by the development of new wireless user equipments (UEs) and the proliferation of bandwidth-intensive applications, traffic load in cellular networks will increase in an explosive manner
We propose to first classify the coverage of heterogeneous network (HetNet) into a couple of areas based on coordination efficiency
We propose to classify the cell coverage according to the reference signal receiving power (RSRP), where the RSRP is defined as the received power at the user terminal measured from the cell-specific reference signal within the considered frequency bandwidth
Summary
Driven by the development of new wireless user equipments (UEs) and the proliferation of bandwidth-intensive applications, traffic load in cellular networks will increase in an explosive manner. A new method is proposed to realize an efficient area classification, and as a particular application, an area-classified spatial interference coordination scheme based on limited feedback is further developed, which has a much increased success rate of user pairing and improves the throughput performance. In frequency division duplex (FDD) systems, the CSI should be fed back from the users using the methods such as [29,30] and shared between the BSs, causing a large overhead Though this problem has been intensively studied for the homogeneous network in the literature, the wide range of the SINR distribution resulting from heterogenous deployment has not been well exploited to reach a good trade-off between the coordination gain and the overhead. This implies that the cell central area has a much smaller coordination efficiency
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