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Device-to-device (D2D) communication has become a key technology in the fifth-generation cellular networks. Resource allocation is critical to ensure satisfactory performance. However, most existing resource allocation policies focus on delay-unaware performance metrics, such as throughput and power consumption, thus being effective only in delay-insensitive scenarios. To overcome this problem, in...
Device-to-device (D2D) communication has been considered as a key technique in the fifth generation cellular networks. Power control is critical to ensure satisfactory performance. However, most existing power control schemes focus on delay-unaware metrics, such as throughput and power consumption, thus only applying to delay-insensitive scenarios. To overcome this problem, we in this paper consider...
Data delivery in opportunistic networks requires robustness and resiliency due to the mobility and the probabilistic propagation of the channels caused by fading. The store-carry-forward (SCF) based routing has become a conventional data forwarding mechanism in such networks. Due to the information dissemination nature of SCF routing, information epidemics control has become a necessary mechanism...
In this paper, we consider the delay tolerable data traffic transmission in Heterogeneous Networks (HetNet) and propose a flow-level-delay constraint small cell sleeping scheme to achieve energy saving gain. We use the flow-level model to capture the process of data transmission in micro base station (BS) which is the small cell we consider. Our scheme takes advantage of the feature of HetNet and...
Device-to-device (D2D) communication is envisioned as a promising technology in future cellular networks. In this paper, we investigate the delay-aware resource allocation and power control algorithm for delay-sensitive D2D communications underlaying cellular networks. With the objective to minimize the average delay and average drop rate, we formulate the optimization problem as an infinite horizon...
In this paper we propose an algorithm to optimize the network-level delay based on flow-level model, denoted as flow-level delay, in fractional frequency reuse (FFR) cellular networks. The flow-level model can capture the impact of the dynamic traffic in the network by considering the arrival and departure of the traffic flows in all cells. In addition to this temporal distribution, the spatial distribution...
The advent of cloud systems has spurred the emergence of an impressive assortment of Internet services. Recent pressures on enhancing the profitability by curtailing surging dollar costs on energy have posed challenges to, as well as placed a new emphasis on, designing energy-efficient request dispatching and resource management algorithms. What further adds to the design challenge is the highly diverse...
The performance of multiuser MIMO-OFDM downlink systems with block diagonalization (BD) depends on the accuracy of the channel state information (CSI) available at the transmitter (CSIT) to a great extent. In time-varying channels, the CSIT is always outdated due to an inherent time delay between the uplink channel estimation and the downlink data transmission in TDD systems. This will lead to drastic...
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