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Abstract-Heterogeneous deployment comprising overlays macrocell and small cells is a promising solution to enhance both system capacity and coverage. Nevertheless, the performance of heterogeneous networks uplink is severely degraded due by cross-layer interference, especially the interference that small cell suffers from the proximate macro UEs (MUEs). In this paper, we propose a Cross-Tier Interference-Aware...
In this paper, we investigate efficient beamforming schemes for downlink broadcast channels of MIMO systems. Optimal solution to this problem is known to be infeasible due to the prohibitive complexity and recent research focuses on suboptimal approaches with reduced complexity. We first present a progressive beamforming method that maximizes the net gain in sum throughput for newly added users and...
Multicell collaboration is considered for power allocation in OFDMA downlink to mitigate the intercell interference. We propose a coordination approach to maximize the sum utility of a cluster of co-channel users by properly configuring user transmit power in local cells. In particular, we employ the well-known $\alpha$-PF metric as the utility function to accounts for the fairness between users in...
In this paper, the spectrum efficiency for four scenarios: baseline, cell split, fixed relay and dedicated mobile relay on vehicle are analyzed and compared in terms of unified spectrum efficiency bps/Hz/km2. The theoretical expression is derived and the capacity is calculated by numerical integration based on the parameters for 3GPP LTE-advanced system. The deployment costs for different scenarios...
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