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Flexible spectrum ROADMs facilitate networks to support channels operating at heterogeneous line rates by allocating spectral resources in a dynamic and flexible manner leading to better Spectral Efficiency. In a realistic network, traffic scenario is very dynamic in nature leading to continuous tear down of existing demands and set up of new demands. This dynamic tear down and set up process leads...
Slow Start algorithm helps the TCP flows to quickly ramp up their congestion window (cwnd) by employing an exponential increase pattern. This pattern of increasing cwnd leads to consecutive loss of packets in bulk, and hence, results in large number of packets being re-transmitted. Recently, the limitations of this approach have become apparent as many Internet applications are becoming more sensitive...
Dynamic adaptive streaming over HTTP (DASH) is gaining popularity for video streaming over the Internet. DASH uses a rate adaptation algorithm to adapt the bitrate played continuously based on the network conditions. Most of the algorithms use buffer occupancy, throughput, or a combination thereof to adapt the bitrate. In the literature, the Quality of Experience (QoE) of users is measured objectively...
The research community has devoted much attention to the use of classic network technologies for advanced traffic engineering, but the use of software-defined networking (SDN) for this purpose, particularly in regards to Quality of Service (QoS) optimizations, remains relatively unexplored. We have developed a QoS framework that leverages SDN capabilities to achieve optimal throughputs for all QoS...
Routing algorithms in Mobile Ad hoc Networks like DSR, AODV use flooding as the primary mechanism for discovery of routes in the network. In flooding, each node forwards flood packets to its neighbors so as to ensure that the packets reach the intended destination. Forwarding of redundant flood packets create extra overhead on network bandwidth. However, only a subset of nodes need to forward the...
High downlink and uplink speeds are achievable with the aid of LTE. Providing this technology in real life requires scheduling algorithms that will effect the concepts such as throughput and fairness. In this paper some new averaging methods for proportional fair algorithm are proposed. Simulation results show that arithmetic mean method can increase spectral efficiency and fairness performance of...
Present data center (DC) network provisioning schemes primarily utilize conventional load-balancing technologies, offering individual application performance improvement. Diversity in application usage however, makes isolated application prioritization a performance caveat for users with varying application trends. The present paper proposes a user profiling approach to capture application trends...
Seamless computing and service sharing in community networks (CNs) have gained momentum due to the emerging technology of community network micro-clouds (CNMCs). However, deploying and running services in CNMCs confront enormous challenges to cope with, such as the dynamic nature of micro-clouds, limited capacity of nodes and links, asymmetric quality of wireless links, geographic singularity based...
There are many high-speed TCP variants with different congestion control algorithms, which are designed for specific settings or use cases. Distinct features of these algorithms are meant to optimize different aspects of network performance, and the choice of TCP variant strongly influences application performance. However, setting up tests to help with the decision of which variant to use can be...
The share of video streaming in the Internet traffic is expected to reach 80% by 2019. To deliver these video services in possibly strained settings and to meet with the users requirement of anywhere and multi-screen experience, HTTP Adaptive Streaming (HAS) is gaining momentum. However, TCP-transport of HAS flows is known to entail a number of issues both on Quality of Experience (QoE) and network...
This paper proposes PINK (Passive INverse feedbacK), a queue management algorithm designed to indirectly impose a certain resource allocation policy on defined sets of client hosts. PINK adds intelligence at intermediate nodes that connect client hosts to bottleneck links or to external networks in general, allowing these nodes to dynamically modify the TCP Acknowledgments (ACKs) segments passing...
The performance of general-purpose graphics processing units (GPGPUs) is often limited by the efficiency of the memory subsystems, particularly the L1 data caches. Because of the massive multithreading computation paradigm, significant memory resource contention and cache thrashing are often observed in GPGPU workloads. This leads to high cache miss rates and substantial pipeline stall time. In order...
In the delivery of end-to-end services, Network Functions (NFs) are frequently utilized. Traditionally, these NFs are implemented on middle-boxes. Since physical middle-boxes are hardware-based, expensive and hard to maintain and upgrade, they are replaced by Virtual Network Functions (VNFs) following the trend of Network Function Virtualization (NFV). Nowadays services are implemented by the ordered...
This paper presents the cross layer network design of traffic management in terms of throughput, spectrum efficiency, congestion control, latency and prioritized Quality of Service (QoS) for broadband satellite network. Design aspects include queueing structure and algorithms for link layer multiplexing and queue servicing, flow control between Layer 2 and Layer 3, scheduling and QoS provisioning...
Microstrip patch antenna has extensive applications in areas requiring light weight and low profile antenna sub system. Differential Evolution (DE) algorithm and Cuckoo Search (CS) algorithm are modern optimization algorithms used here for determining the design parameters of microstrip antenna. In literature, there does not exist any direct relation between the bandwidth of a microstrip patch antenna...
This paper proposes an algorithm to design band-limited Orthogonal Frequency Division Multiplexing (OFDM) pulses for accurate time-of-flight ranging in acoustic-based localization systems. The proposed algorithm is capable to generate OFDM pulses with higher energy when compared with other common pulse design approaches with similar characteristics. The results attained have shown that it is possible...
Hardware acceleration of artificial neural network (ANN) processing has potential for supporting applications benefiting from real time and low power operation, such as autonomous vehicles, robotics, recognition and data mining. Most interest in ANNs targets acceleration of deep multi-layered ANNs that can require days of offline training to converge on a desired network behavior. Interest has grown...
As named data networking (NDN) continues to evolve into a mature and production network, a robust and efficient congestion control mechanism has become a fundamental requirement for the success and wide deployment of NDN. In this paper, upon exploring the unique hop-by-hop Interest forwarding feature, based on the CUBIC, we develop a novel congestion control mechanism for NDN. Our congestion control...
Data compression is a science of representing actual information in a more compact form by reducing its size to some extend. Reliable and efficient data compression accompanies least memory usage and less computational complexity. This work proposes a lossless compression technique for the efficient compression of both images and text files. LiBek II is an adaptive dictionary based algorithm in which...
The efficiency of the compression parameters of video control method is directly related to the number of parameters. Namely, the time required to process each of the frames, and the possibility of considering the peculiarities of the processed frames content. This article describes factors that affect the value of the transmission delay and explores improving aspects for the performance parameters...
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