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This paper proposes a method of TCP multi-pathization for IoT network by SDN. The method distributes packets according to the congestion between paths and IP packet length. Since it is performed over SDN, no changes of existing protocols and devices are required. The authors implement the method by actual IoT devices and evaluate QoS by experiment. The results of the experiment show that the TCP throughput...
To be able to efficiently utilize high data rates of 100 Gbit/s and beyond, protocols must be carefully selected for specific communication parameters. At the same time, communication parameters, such as data rate/latency requirements and the channel quality, are not static. This contradiction can be solved by switching to the best suited protocol when communicationparameters change. However, replacing...
Recently, the 3rd Generation Partnership Project (3GPP) has standardized LTE-licensed assisted access (LTE-LAA) supporting LTE downlink carrier aggregation (CA) in the 5 GHz unlicensed spectrum. LTE-LAA technology allows LTE operators to freely use additional frequency resources in the 5 GHz unlicensed spectrum. Therefore, the problem of coexistence with other existing communication technologies in...
Backscatter communication enables a device to transmit or receive data using only the energy harvested from ambient RF signals. It can be realized via employing energy-efficient modulation and demodulation mechanisms. Specifically, a threshold-based demodulation method integrated with signal smoothing has generally been employed for backscatter communications. However, previous proposals considering...
OpenFlow/Software-Defined Networking (SDN) is a new networking paradigm that virtualizes network infrastructure by decoupling the control and data plane logic of traditional network devices. The controller of SDN has the overall look about network topology and hence provides flexibility to network operators to implement its own routing approaches. However, it could not control the way client works...
ECN thresholds have limited operational range and very strict scope. Lower thresholds exacerbate the queue underflow while higher thresholds increase the queueing delays. In this paper, an Adaptive ECN (A-ECN) marking scheme is proposed to enhance the performance of ECN. A-ECN can adaptively adjust ECN marking thresholds in different scenarios to achieve good generality. Therefore, network operators...
The performance of router directly impacts the Network-on-Chip (NoC) performance. This paper focus on developing efficient microarchitecture of allocator in the router and proposed matrix-diagonal allocator with high matching quality and low packets latency. The allocator, taking advantage of the fact that each element in the diagonal doesn't share the same row or column, includes matrix-diagonal...
The rapid proliferation of devices of the Internet of Things requires a vast network of heterogeneous devices to maintain the ability to communicate rapidly and seamlessly. The transition to delay sensitive Tactile Internet applications would demand on a new information and communications infrastructure. In our previous work, we have proposed a fast Location basEd Source Switching (LESS) mechanism...
Implementing complex arithmetic routines with Single Instruction Multiple Data (SIMD) instructions requires the use of instructions that are usually not found in their real arithmetic counter-parts. These instructions, such as shuffles and addsub, are often bottlenecks for many complex arithmetic kernels as modern architectures usually can perform more real arithmetic operations than execute instructions...
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...
Network function virtualization (NFV) is a concept aiming to achieve telecom grade cloud ecosystem for new generation networks focusing on Capital and Operational expenditure (CAPEX and OPEX) savings. Keeping at least the same performances is one of the main requirements of the applications when being virtualized. This work presents a performance impact of Open Virtual Switch (OVS) user-space forwarding...
Low-level design parameters such as router micro-architecture (RMA), flow controls (resource allocation), routing techniques and traffic patterns have a major significance on cost and performance of Network on Chip (NOC) design. This work proposes an efficient virtual channel (VC) buffer management structure and a dynamic VC allocation mechanism for the router to minimize latency, and area (buffer...
Network-on-Chip provides scalable communication in Systems-on-Chip with many Intellectual Property cores. Studies have shown that unutilized router buffers lead to significant network performance degradation. This work presents Roundabout, a new asynchronous router architecture with inherent and effective buffer utilization. Inspired by real-life multi-lane roundabouts, it consists of lanes shared...
In Many/Multi-core processor architectures, hundreds and thousands of Intellectual Property (IP) cores are integrated to reinforce parallel processing and high performance computing. Integration of IP cores is effectively realized by a scalable communication framework, Network on Chip (NoC). NoC comprises of routers and interconnection links which aid transfer of information between IP cores. It is...
A cognitive vehicle network is date from Vehicular Ad hoc Networks (VANET), which is proposed to solve the problem of control channel and spectrum scarcity in VANET. To resolve channel conflict problem in channel switching in vehicle network, a new dynamic spectrum allocation algorithm (DSAARCC) is proposed. When the vehicle user chooses the channel, to minimize the average delay under the condition...
In this paper, cognitive machine to machine (CM2M) gateway in e-healthcare systems are presented by accessing several channels via periodic sensing and spectrum handoff. An optimal energy efficient spectrum management mechanism with multiple thresholds is proposed. The developed mechanism aims to reduce energy consumption in the system by optimizing the spectrum sensing and channel switching, while...
A Named Data Networking (NDN) router can maintain a record in its PIT for every Interest packet and leverage PIT table to achieve the goal of stateful forwarding. In this paper, a more general application scene that presents new challenges for stateful forwarding is considered. The network element needs to keep states of previously forwarded packets to determine the forwarding behavior of subsequent...
Panoramic streaming enables users to interactively navigate through high-spatial resolution videos and create an immersive and personalized user experience. Since transmission of high-resolution videos in desirable quality is not feasible given the limited throughput of access and home network links, our work is based on tile-based streaming, where only a spatial subset of the video is transmitted...
ZooKeeper is a widely used distributed coordination and synchronization service for distributed applications. It relies on the built-in atomic broadcast protocol Zab to provide high availability and guarantees such as totally ordered updates for the overlying applications. ZooKeeper’s flexibility, however, is limited with regard to the underlying Zab protocol.In this work, we propose to switch ZooKeeper’s...
The ever changing nature of network technology requires a flexible platform that can change as the technology evolves. In this work, a complete networking switch designed in OpenCL is presented, identifying several high-level constructs that form the building blocks of any network application targeting FPGAs. These include the notion of an on-chip global memory and kernels constantly processing data...
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