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The limitation of bandwidth resource in a wireless network has driven a large amount of work in resource scheduling to better utilize the available bandwidth. Most of these work aim to maximize the throughput by considering a uniform user distribution across the cellular network. In reality, users may be distributed non-uniformly. This work studies the effects of nonuniform user distribution on throughput...
Millimeter wave (mmWave) communication is a key enabling technology for 5G cellular systems. However, due to mmWave propagation characteristics, link length for very high rates is limited and will likely necessitate the use of relay nodes for longer-range ultra-high-speed backhaul communications. This paper investigates relay selection and scheduling to support high end-to-end throughput in mmWave...
Millimeter-wave communication in 60 GHz band is considered a promising technology to meet the explosive growth of data demand in Wi-Fi based WLAN. To address potential blockage for 60 GHz signals, multiple APs are proposed for such WLAN. This paper addresses the important problem of AP assignment and transmission scheduling for a multi-AP 60 GHz WLAN. We propose two AP assignment schemes with different...
In wireless network system the resources are limited. Therefore, managing resources is considered as a challenging task. The resource are distributed among attached UEs, so allocating resources needs to be well controlled. Packet scheduler in LTE network is responsible for assigning resources to attached UEs. Also, femtocell network is considered as promising solution for poor channel in indoor environment...
In the paper, we studied the solution of resource allocation problem with Coordinated Multi-Point(CoMP) in heterogeneous wireless networks. The utilization of CoMP technology enhances channel quality of users at the edge of cells, but it also brings more complexity to resource management of the network. To reduce this pressure, we exploited a feedback-based method to determine the allocation of users...
Distributed controller architectures have been proposed for Software-Defined Networking (SDN) to ensure scalability and reliability. One major drawback of the existing architectures is the uneven load distribution among controllers stemming from the static binding between controllers and switches. To address this issue, several existing studies introduce dynamic binding by adopting some switch migration...
Non-orthogonal multiple access (NOMA) is a promising radio access technique for the next generation (5G) cellular communication. The optimal power control, user scheduling, and resource allocation scheme to maximize the overall network throughput of downlink NOMA systems is investigated in this paper. A practical imperfect channel state information (CSI) model is adopted in our investigation where...
Most applications running on supercomputers achieve only a fraction of a system's peak performance. It has been demonstrated that the co-scheduling of applications can improve the overall system utilization. However, following this approach, applications need to fulfill certain criteria such that the mutual slowdown is kept at a minimum. In this paper, we present an HPC scheduler that applies co-scheduling...
In a cloud data center, it is common for a storage system to be shared by front-end, user-interacting applications and back-end, data-intensive applications running on different virtual machines (VMs). Although it is necessary to meet the latency requirements of I/O streams generated by the VMs that execute the front-end applications, this can be difficult because: (1) often their latency requirements...
In the near future, because of its growing popularity and improved support for increased traffic demands from subscribers, a very dense deployment of small cells is expected in LTE-Advanced heterogeneous networks (HetNets). While this kind of deployment is expected to prepare LTE-A networks to serve the subscribers better, it will further increase their energy consumption thereby raising the carbon...
This paper considers the transmission scene of multicasting hard deadline constrained prioritized (HDCP) packets via cellular links and D2D links. That is to say, each device with two wireless interfaces could receive HDCP packets from the base station (BS) and transmit or receive HDCP packets from other devices concurrently. In this transmission scene, we study the problem of maximizing the network...
Network coding has shown the promise of significance throughput improvement. In this paper, we study the throughput of two-hop wireless network coding and explore how the maxi-mum throughput can be achieved under a random medium access scheme. In this paper, the problem of the performance of COPE type network coding under dual source coding architecture is solved. An Embedded Markov Chain Model for...
Big data analytics frameworks are developing towards larger degrees of parallelism and shorter task durations to achieve lower latency. Consequently, millions of scheduling decisions need to be made per second, which has posed a big challenge to today's centralized schedulers. Therefore, many researchers and enterprises turn to distributed scheduling approaches to avoid the throughput limitation of...
Non-Orthogonal Multiple Access (NOMA) has proven itself as a serious candidate for multiple access schemes in the 5th generation of wireless communication systems. In this paper, we propose new resource allocation techniques that allow the coupling of NOMA with multiple-input-multiple-output (MIMO) systems. As in most of downlink NOMA systems, the proportional fairness (PF) scheduler is used. As for...
This paper proposes a layered decoder architecture for array QC-LDPC codes which targets tens of Gbps data rates. It relies on layer unrolling with pipeline stages in between layers, allowing simultaneous decoding of multiple layers. The most important features of the proposed decoder are: (i) fully parallel processing units within each layer (ii) hardwired layer interconnect that allows the removal...
Infrastructure providers (InPs) can provide virtual networks (VNs) to service providers (SPs) through wireless network virtualization. These VNs share the wireless spectrum and they are supposed to meet various requirements of different SPs. In order to satisfy the requirements such as quality of service (QoS), fairness and isolation, efficient and flexible slicing and scheduling schemes are necessary...
Today's data centers networks are commonly featured with the richness paths. This aim to improve the network performance with multipath connections and increases reliable system connection for the cables get cut, the failures of switches or routers. However, the common problem of multipath connection is suffered from the difference path conditions in term of speed and delay. In this paper based on...
Vehicular ad-hoc networks (VANETs), as an important component of intelligent transportation systems (ITS), have been attracting more and more research interests for their various promising applications. Although various MAC protocols have been proposed, efficient medium access remains a significant challenge in VANETs, especially in improving the network throughput in heavy traffic vehicular networks...
In this paper, we propose an opportunistic scheduling algorithm for secondary users (SUs) in a dynamic spectrum access network. Scheduling is performed at the beginning of each super-frame where appropriate channel(s) are assigned to the SUs based on the expected throughput that each channel provides. We compute the expected throughput for each channel on specific time slots in a super-frame based...
In wireless LAN, low channel utilization is a serious problem. We have proposed some packet transmission scheduling methods that improve channel utilization by transmitting packets at as high rate as possible through preferential scheduling of packets in proper wireless condition, compared with an existing approach that uses lower transmission rate according to the channel fading around receiver stations...
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