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MU-MIMO proposed in 802.11ac is to achieve higher data rate, with transmitting to multiple users concurrently. However, the overhead cost by collecting channel state information (CSI) sometimes even overwhelm real data transmission when quantity of user is large, which leads the network and unscalable. In this work, we address the problem with adaptive location-based CSI feedback compression (LFC),...
Service interruptions from mobility events, such as handovers and connection failures, are some of the major impairments for fulfilling the ultra-reliability requirements in fifth Generation (5G) mobile networks. One of the solutions to tackle the aforementioned challenges is multi-connectivity with Single Frequency Network (SFN) transmission, which refers to noncoherent joint transmission of a signal...
4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role...
In this study, we demonstrate that the performance may be undermined in the state-of-the-art intra-SM sharing schemes for concurrent kernel execution (CKE) on GPUs, due to the interference among concurrent kernels. We highlight that cache partitioning techniques proposed for CPUs are not effective for GPUs. Then we propose to balance memory accesses and limit the number of inflight memory instructions...
The increasing demand for underlaying cellular network has benefit form Device-to-Device (D2D) communication, where one need to apply productive plan for resource allocation to increase system capacity and mitigate interference. The bipartite graph matching strategy is used for optimizing the resource allocation among all other strategies; Kuhn-Munkres (KM) is one of algorithm applied to increase...
Future mixed-criticality systems must handle a growing variety of traffic requirements, ranging from safety-critical real-time traffic to bursty latency-sensitive best-effort traffic. Additionally, safety standards (e.g. ISO 26262) require sufficient independence among different criticality levels for mixed-criticality systems. Networks-on-Chip (NoCs), as a scalable and modular interconnect, are used...
With an abundance of wireless devices saturating daily life, the ability of devices to coexist among other devices is of increasing interest. While standards are starting to incorporate coexistence measurements, the robustness of coexistence measurement methods is still an area of active research. To demonstrate the robustness of the multiple test methods, a series of measurements needs to be conducted...
Management of Interference Is the solution designing for LTE network to reduce inter symbol interference (ISI) and intercell interference (ICI) using the frequency reuse schemes which has the objective to maximize the coverage area and provide more capacity in cells, especially in cell edge. Based on those propositions, this paper analyzes the process of optimizing subcarrier and power allocation...
In this paper, we investigate the problem of cross-layer design of the link scheduling, frequency assignment and flow control in hybrid terrestrial-satellite wireless backhauling networks. Considering network limitations and requirements, the target is to maximize the traffic that can be delivered by the network in a given period of time by deciding the active backhauling links that can transmit simultaneously...
Ultra-dense network (UDN) is expected to be the main means of meeting the mobile traffic demands in 5G. Small cell is the main load of UDN to save energy and enhance coverage. However, the resource conflict become much more complicated than the conventional cellular system, because of the dense and random deployment and the dynamical switch of small cells, and the changeable users. Therefore, this...
Inbound handover (HO) or hand-in is accomplished when the user equipment (UE) performs HO from macrocell (MC) to a small cell (SC) [1] [2]. When the UE connects to a SC with a time of stay (ToS) less than a predefined time threshold, this will result in frequent unnecessary HOs and also increase service interruption which in turn will degrade the end user quality of service (QoS). In this paper, we...
Small cells are low-powered cellular radio access nodes which make best use of available spectrum by reusing the same frequencies many times within a geographical area. However, the deployment of small cells (e.g., femtocells) may introduce extra interferences such as cross-tier(macrocellfemtocell) and co-tier (femtocell-femtocell) interferences. In this regard, an effective interference management...
We study the performance of a multibeam satellite system under different frequency reuse schemes. We provide an information theoretical framework to analyze the achievable rates in two beams sharing the same frequency, based on single-user and multiuser detection. We compare two alternative strategies to serve two users in two beams, showing that interesting gains are possible by using multiuser detection...
In the ultra dense network (UDN), user-centric virtual cell (VC) has been proposed to weaken the traditional concept of base station centric cell, where each user is served by several transmit points (TPs). The overlapped VCs in UDN will result in severe inter-VC interference and degrade the system throughput. Merging overlapped VCs can transform the serious inter-VC interference into intra-VC interference,...
A service-aware dynamic bandwidth allocation with CoMP is proposed in the heterogeneous 5G fronthaul network. Simulation results show that the throughput and delay performance of users have been improved, and the QoS for high priority users can be guaranteed preferentially.
In this paper, we study the link scheduling problem considering the fluctuating fading effect in transmissions. We extend the previous deterministic physical interference model to the Rayleigh-fading model that uses the stochastic propagation to address fading effects. Based on this model, we formulate a problem called Fading-Resistant Link Scheduling (Fading-R-LS) problem, which aims to maximize...
In this work, decentralized coordinated scheduling in LTE-Advanced downlink networks is studied, where the base stations abstain from transmitting data on particular frequency/time resources in order to reduce the inter-cell interference experienced by users connected to neighboring base stations. The proposed decentralized scheme is derived with regard to low information exchange between the base...
Offloading users from an overloaded macro base station (BS) to a lightly loaded small cell BS is critical to alleviate the congestion of the macro BSs. However to overcome the signal-to-interference-plus-noise ratio (SINR) degradation of the offloaded users, offloading should be done in conjunction with an efficient interference management technique. Strict fractional frequency reuse (Strict-FFR)...
In dense wireless deployments, such as Enterprise WLANs (EWLANs) and home WLANs, interference may occur because of neighbouring WLANs sharing the same unlicensed spectrum. Mechanisms to centrally manage WLAN deployments cannot effectively mitigate the interference caused by hidden terminals (HTs) in WLANs that belong to different organisations. Furthermore, the impact of interference is amplified...
Conventional simultaneous wireless information and power transfer (SWIPT) schemes generally assume that only the currently harvested energy will be used for the following signal forwarding. As a result, it is impossible to amplify the signal in theory. And even unfortunately, the forwarded signal power is splitted and the forwarded signal will be subject to severe attenuation when compared to the...
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