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Network engineers and designers need additional tools to generate network traffic in order to test and evaluate, for instance, application performances or network provisioning. In such a context, traffic characteristics are the most important part of the work. Indeed, it is quite easy to generate traffic, but it is more difficult to produce traffic which can exhibit real characteristics such as the...
In next generation mobile communication systems, the cell size reduction is unavoidable due to the transmission power limitation at user equipments (UEs). The small cell size accelerates traffic non-uniformity between cells, and this situation brings non-uniform transmission performance between cells across the system. The inter-cell carrier aggregation (CA) technique, which aggregates multiple component...
In wireless access networks the traffic load varies strongly along a day and efficient concepts to adapt the power consumption of LTE macro base stations to the required traffic load are currently widely under study. Significant daily energy savings up to 35% can be achieved for different deployment scenarios by introducing energy adaptive hardware features in combination with energy aware scheduling...
Spatial diversity for wireless transmission requires more than one antenna at the transmitter. However, mobile devices are usually limited by size, so installation of multiple antennas increases the hardware complexity significantly. Due to the omnidirectional nature of wireless signal, a data transmission between a source node and a destination node can be overheard by many other neighbor nodes....
The Delay Tolerant Networks (DTN) are networks where the end-to-end paths between source and destination are unstable or unlikely. In such networks, conventional path-discovery-based MANET routing techniques like AODV and DSR are not possible because the network may not form a single connected partition at any time, and thus a full path may never exist between the source and the destination. In such...
The increasing demand for multimedia communication over wireless platform necessitates the QoS-aware packet scheduling schemes in Broadband Wireless Access (BWA) networks. This paper deals with the analysis of queue size of QoS-aware Weighted Hybrid Packet Scheduling Schemes (WHPSS) for heterogeneous traffic classes in BWA networks. By categorizing the heterogeneous traffics of BWA networks into several...
In Wireless Sensor Network (WSNs), routing protocol is an important aspect to utilize network resources fairly. Normally, routing mechanisms are selfish in nature and are based on a single objective criterion, e.g., hop count. This behaviour is inappropriate for a long lasting communication as it causes performance degradation in the entire network and ultimately leads to network congestion. To enhance...
In IEEE 802.15.4 beacon-enabled mode, the personal area network (PAN) coordinator can assign guaranteed time slot (GTS) to allocate a particular duration for requested devices. The main challenge in GTS mechanism is how the PAN coordinator allocates time slot duration for the devices which request GTS. However, if the allocated devices use GTS slot partially or the traffic pattern is not suitable,...
Power line Communications (PLC) has gained a lot of interest for the last mile or access because the normal electric power line is utilized for transmission also communication signals. Considerable research effort has been taken on investigating the technologies. But the transmission scheduling is still a key design problem in the PLC networks. In this paper, a transmission scheduling for providing...
Multi-channel MAC protocols have attracted much attention because they possess the ability to boost the capacity of wireless ad hoc networks. In previous works, a lot of multichannel protocols, such as DCCB[1-2], HB[4], and SB[5-7], have been proposed to cope with the rendezvous problem and efficiently utilize the bandwidth resources. However, these protocols might cause the channel traffic unbalance...
The distribution of traffic and temperature in a highperformance three dimensional Network-on-Chip (3D NoC) system become more unbalanced because of chip stacking and applied minimal routing algorithms. To regulate the temperature under a certain thermal limit, the overheated nodes are usually throttled by run-time thermal management (RTM). Therefore, the network topology becomes a Non-Stationary...
Optical Burst Switching technology is a promising paradigm for the next generation optical network. The assembly algorithm is an essential issue in the OBS network. In this paper, we propose a novel assembly algorithm that rapidly finds out the optimal assembly threshold according to the feedback loss information. Simulation results show that the performance of the proposed Auto-search Optimal Threshold...
In previous work, we proposed an Autonomic Network Performance Management (ANPM) framework that follows a control-theoretic approach. We built and verified the framework using network simulations but there were many questions needed to be accurately answered concerning the feasibility of such framework in real networks. In this paper, we are going from simulation to testbed implementation to accurately...
Wireless sensor networks based on the IEEE 802.15.4 standard is able to achieve low-power transmissions in low-rate and short-distance wireless personal area networks (WPANs). It employs the slotted carrier sense multiple access with collision avoidance (CSMA/CA) in the contention access period (CAP). Unfortunately the periodic broadcast beacon frame is transmitted without CSMA/CA so that it could...
Different Medium Access Control (MAC) Protocols for Wireless Sensor Networks (WSNs) have been proposed over the last few years. IEEE 802.15.4 MAC protocol standard is designed for low-power, low-cost, and low-rate Wireless Personal Area Networks (LR-WPANs). The contention period of IEEE 802.15.4 standard consists of Contention Access Period (CAP) and Contention Free Period (CFP). CAP utilizes Carrier...
The thermal issue is important for 3D Network-on-Chip systems. To ensure the thermal safety, the near-overheat routers are throttled and the 3D topology becomes Non-Stationary Irregular Mesh (NSI-Mesh). To ensure the successful packet delivery in the NSI-Mesh, Transport Layer Assisted Routing (TLAR) scheme was proposed. It has better performance than the conventional routing approaches for NSI-Mesh...
In this paper, a distributed traffic-balancing routing protocol is proposed for multi-sink industrial wireless sensor networks that effectively distributes traffic from sources to sinks. Each node has a gradient field that is used to decide on a neighbor node to reach a sink. The node's gradient index contains (1) the distance cost from source to a respective sink, and (2) traffic information from...
Game theoretic analysis is employed in ‘medium access control (MAC)’ protocol systems for wireless data networks, where the Erasure coding is integrated to improve the reliability and the throughput level. The redundancy is thus introduced, and when it is structured in an exploitable manner, it will be then possible to correct important errors injected by the channel. We present a redundant packets...
In this paper, a novel semi-static inter-cell interference coordination scheme based on spectrum pool is proposed for cellular OFDMA systems. In the proposed scheme, the spectrum is divided into three partitions, called major subbands group, minor subbands group and spectrum pool group. The major subbands and the spectrum pool are used by all users in a cell and the minor subbands only can be used...
Cellular networks are evolving towards a mixture of macro cells and small cells, thereby increasing the number of cell sites to serve traffic hotspots. This trend poses challenges for managing inter-cell interference and traffic offloading, since a multitude of transmitters of different power classes creates imbalance between the downlink and uplink coverage. Conventional network planning and interference...
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