The existence of multiple gateways, as is a common case in Wireless Mesh Networks (WMNs), brings the possibility to improve network performance. However, previous studies, including both heuristic-based works and theory-driven crosslayer design works, cannot guarantee an optimal exploitation of multiple gateways. In this paper, we focus on exploiting multiple gateways optimally to achieve maximum…
Tags: IEEE OMNeT++ Projects
Energy Efficient Transmission Approach for WBAN Based on Threshold Distance
Energy efficiency is a key concern for wireless sensor nodes, especially for wireless body area network (WBAN) in which sensors operate in close vicinity to, on or even inside a human body. In this paper, we firstly present a system level energy consumption model associated with transmission distance d and transmission data rate over on-body…
Retaining control over SDN network services
Both academic researchers and network vendors have started to promote Software-Defined Networking (SDN) as a new network paradigm, in which controller systems play a major role. A modular and extensible design allows network operators to extend the controller’s functionality by so called network services. Unfortunately, in current designs such network services have unlimited access to…
OpenFlow-assisted online defragmentation in single-/multi-domain software-defined elastic optical networks [invited]
Spectrum fragmentation limits the efficiency of spectrum utilization in elastic optical networks (EONs). This paper studies how to take advantage of the centralized network control and management provided by software-defined EONs (SD-EONs) for realizing OpenFlow-assisted implementation of online defragmentation (DF). We first discuss the overall system design and OpenFlow protocol extensions to support efficient online…
ANC-ERA: Random Access for Analog Network Coding in Wireless Networks
Analog network coding (ANC) is effective in improving spectrum efficiency. To coordinate ANC among multiple nodes without relying on complicated scheduling algorithm and network optimization, a new random access MAC protocol, called ANC-ERA, is developed to dynamically form ANC-cooperation groups in an ad hoc network. ANC-ERA includes several key mechanisms to maintain high performance in…
Distributed Topological Convex Hull Estimation of Event Region in Wireless Sensor Networks without Location Information
In critical event (e.g., fire or gas) monitoring applications of wireless sensor networks (WSNs), convex hull of the event region is an efficient tool in handling the usual tasks like event report, routes reconstruction and human motion planning. Existing works on estimating convex hull of event region usually require location information of sensor nodes, which…
TDMA-based MAC Protocols for Vehicular Ad Hoc Networks: A Survey, Qualitative Analysis and Open Research Issues
Vehicular Ad-hoc NETworks (VANETs) have attracted a lot of attention in the research community in recent years due to their promising applications. VANETs help improve traffic safety and efficiency. Each vehicle can exchange information to inform other vehicles about the current status of the traffic flow or a dangerous situation such as an accident. Road…
Bidirectional Buffer-Aided Relay Networks With Fixed Rate Transmission—Part I: Delay-Unconstrained Case
In this paper, we consider bidirectional relay networks in which two users exchange information only via a relay node, i.e., a direct link between both users is not present. We assume that channel state information at the transmitter is not available and/or only one coding and modulation scheme is used due to complexity constraints. Thus,…
Interrelationship of protection and communication to improve power system reliability
Dependencies of protection schemes on communications have been acknowledged and discussed in various papers. This paper expands this topic by examining field experiences that required protection engineers to deepen their understanding of communication technologies to interpret protection scheme behavior and perform event analysis. A deployed power system line protection application utilizing segregated phase comparison protection scheme with distance protection…
Evaluating the Performance Impact of Communication Imbalance in Sparse Matrix-Vector Multiplication
HPC applications make intensive use of large sparse matrices with the matrix-vector product representing a significant fraction of the total run-time. These matrices are characterized by non-uniform matrix structures and irregular memory accesses that make it difficult to achieve a good scalability in modern HPC platforms with multi-or many-cores, SIMD and high-speed communication networks. One of the…