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The diversity of IoT applications implies the requirement of reliable yet efficient MAC solutions for supporting transmissions for various traffic patterns. In this paper, we propose GoMacH, an efficient MAC protocol that provides high reliability and throughput for handling various traffic loads in IoT. GoMacH seamlessly integrates several outstanding techniques. It adopts the phase-lock scheme to...
Service elasticity, the ability to rapidly expand or shrink service processing capacity on demand, has become a first-class property in the domain of infrastructure services. Scalable NoSQL data stores are the de-facto choice of applications aiming for scalable, highly available data persistence. The elasticity of such data stores is still challenging, due to the complexity and performance impact...
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...
Datacenter servers often colocate multiple applications to improve utilization and efficiency. However, colocated applications interfere in shared resources, e.g., the last-level cache (LLC) and DRAM bandwidth, causing performance inefficiencies. Prior work has proposed two disjoint approaches to address interference. First, techniques that partition shared resources like the LLC can provide isolation...
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...
Energy consumption problem is considered an extremely important problem that faces the Wireless Sensor Networks (WSNs). For this reason, a lot of efficient energy protocols have been developed in order to reduce the energy consumption, as well as to prolong the lifetime of the sensor networks. The DMHT-LEACH protocol is one of these protocols. It proposes a dynamic technique for facilitating the data...
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...
Field Programmable Gate Arrays (FPGAs) excel at the implementation of local operators in terms of throughput per energy since the off-chip communication can be reduced with an application-specific on-chip memory configuration. Furthermore, data-level parallelism can efficiently be exploited through socalled loop coarsening, which processes multiple horizontal pixels simultaneously. Moreover, existing...
The millimeter-wave (mmWave) bands, roughly referred to 30-300 GHz, have been widely recognized as a promising candidate for dense deployment of small- cells backhaul network. The dense small-cell deployment produces a huge amount of backhaul traffic, and directional communication poses a significant challenge. In this paper, we propose a dynamic frame reconfiguration scheme which provides greater...
Directional antennas provide many advantages such as higher gain, increased capacity, longer range, and reduced interference by concentrating radio signal energy in one direction. This paper addresses concurrent transmission scheduling in wireless personal or local area networks deployed with directional antennas. In typical network deployment scenarios, it is quite likely to have non-uniform node...
We consider the practical problem of video surveillance in public transport systems, where security videos are stored onboard, and a central operator occasionally needs to access portions of the recordings. When this happens, the selected video must be uploaded within a deadline, possibly using multiple parallel wireless interfaces. Interfaces have different associated costs, related to tariffs charged...
Cyber-physical applications are subject to temporal validity constraints, which must be enforced in addition to traditional QoS requirements such as bounded latency. For many such systems (e.g., automotive and edge computing in the Industrial Internet of Things) it is desirable to enforce such constraints within a common middleware service (e.g., during event processing). In this paper, we introduce...
Flow completion times (FCTs) are critical for many cloud applications. To minimize the average FCT, recent transport designs, such as pFabric, PASE, and PIAS, approximate the Shortest Remaining Time First (SRTF) scheduling. A common, implicit assumption of these solutions is that the remaining time is only determined by the remaining flow size. However, this assumption does not hold in many real-world...
Optical switches have been drawing attention due to their large data bandwidth and low power consumption. However, scheduling policies need to account for the schedule reconfiguration delay of optical switches to achieve good performance. The Adaptive MaxWeight policy achieves optimal throughput for switches with nonzero reconfiguration delay, and has been shown in simulation to have good delay performance...
Synchronous Dataflow (SDF) is the most commonly used dataflow Model of Computation (MoC) for the specification of Digital Signal Processing (DSP) systems. The Interface-Based SDF (IBSDF) model extends the semantics of the SDF model by introducing a graph composition mechanism based on hierarchical interfaces. Computing the throughput of an application is essential when designing DSP systems. This...
Streaming data analytics has become increasingly vital in many applications such as dynamic content delivery (e.g., advertisements), Twitter sentiment analysis, and security event processing (e.g., intrusion detection systems, and spam filters). Emerging stream processing systems, such as Spark Streaming, treat the continuous stream as a series of micro-batches of data and continuously process these...
This paper presents the first systematic study on co-scheduling independent jobs on integrated CPU-GPU systems with power caps considered. It reveals the performance degradations caused by the co-run contentions at the levels of both memory and power. It then examines the problem of using job co-scheduling to alleviate the degradations in this less understood scenario. It offers several algorithms...
Synchronous Dataflow Graphs (SDFGs) are widely used to model streaming applications (e.g. digital signal processing applications), which are commonly executed by embedded systems. The usage of on-chip resources is always strictly constrained in embedded systems. As the cost of instruction memory is a significant part of on-chip resource costs, code size reduction is an effective way to control the...
Software-defined networks are constantly evolving due to the updates such as network function (NF) state updates, VM migrations. Network functions virtualization (NFV) with software-defined networking (SDN) has the capability of accurately monitoring and manipulating network traffic, and reducing operating cost. However, it cannot effectively handle the congestion and satisfy service level agreements...
Increasing the density of access points (APs) is often required to improve the coverage and capacity of wireless local area network (WLAN). But such high density deployment may result increased interference and hence poor network performance. The channel assignment problem under this type of highly interfering environment is a challenging task. Every link may not be activated due to the limitation...
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