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Emergency communication in heterogeneous networks with fragile connectivity is a challenging task. Emergency delay-tolerant network (EDTN) is a new network architecture based on the concept of delay tolerant networks (DTNs) to provide emergency service. However, existing transport protocols like TCP are not suitable to provide emergency service well with instable bandwidth and connectivity, because...
We propose a four-layer architecture model (FLAM) to obtain the potential energy savings for sensor nodes in large scale wireless sensor networks. The very first layer, the bottom layer is a network of a resource-constrained sensor nodes deployed in the field. The second layer is ad hoc network formed by resource-rich dynamic sink nodes, also knows as cluster sink nodes. The third layer consists of...
Modern battlefields represent complex network scenarios that include different networking domains, which need to communicate. These domains include different military entities,such as various allies armies, forces of the same army, mobile objects, for example tanks, vehicles, soldiers, flying vehicles, etc., that need to communicate quickly and will minimum of overhead, in order to accomplish their...
The rate compatible punctured convolutional code (RCPC code) is an important module in Multi-band Orthogonal Frequency Division Multiplexing Ultra Wide Band (MB-OFDM-UWB) indoor positioning system introduced in this paper as a kind of useful channel coding to offer more protection against all kinds of channel noise under indoor channel environments. In this paper, RCPC code for MB-OFDM-UWB indoor...
We developed a quality of service (QoS) management system to support service level management (SLM) for global enterprise services. The QoS management system is integrated with one of our enterprise services in a preproduction system, an identical system as the production system but in a test environment. Lab experiments showed that our integrated solution helps global enterprise services to better...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
Internet Relay Chat (IRC) is a critical application in military networks for maintaining situational awareness and conducting battle management at all echelons. But these networks are often subject to frequent disconnections, limited bandwidth, and long delays, especially when using satellite services and field radios. Such conditions are inhospitable to TCP, and thus the standard IRC protocol, which...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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