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Both the network mobility and the terminal mobility are likely to co-exist in the future. These two mobile communication paradigms have different wireless connectivity models and likely to deploy different schemes to address the wireless related performance issues for TCP. In this paper, we consider TCP Snoop, which allows a mobile terminal to efficiently recover from wireless-related losses. For...
Routing is critical in wireless sensor networks (WSNs). It has been widely studied in recent years and many new protocols have been proposed. In this paper, based on observations on event-driven wireless sensor networks, we propose algorithms to reduce power consumption and improve data quality in wireless sensor networks. In our algorithms, sensor nodes reduce the sampling frequency and number of...
Optimizing energy consumption is the main concern for designing and planning the operation of the Wireless Sensor Networks (WSNs). Clustering technique is one of the methods utilized to extend lifetime of the network by applying data aggregation and balancing energy consumption among sensor nodes of the network. In this paper, we propose the recently developed, Harmony Search Algorithm (HSA) for minimizing...
An amplified-and-forward network coded protocol (ANCP) is proved to achieve excellent network performance. In this paper, we first drive the closed-form expression of the system outage probability in the high SNR regime, based on ANCP protocol in a classical butterfly wireless network. However the complex expression is a bottleneck of developing power allocation. Then we approximate the expression...
The proliferation of wireless communications systems poses new challenges in terms of coexistence between heterogeneous devices operating in the same frequency bands. In fact, in case of high-density concentration of wireless devices, like for indoor environments, the network performance is typically limited by the mutual interference among the devices themselves. For instance, this is the case for...
The most widely used medium access control (MAC) scheme for underwater acoustic communication (UWAC) networks is conventional time-division multiple access (TDMA), in which only a single node transmits at each time. Since this TDMA is the bottleneck in high traffic networks, in this paper we present a new MAC protocol for UWAC ad-hoc networks that applies spatial reuse to improve network throughput...
Electricity suppliers have started replacing traditional electricity meters with so-called smart meters, which can transmit current power consumption levels to the supplier within short intervals. Though this is advantageous for the electricity suppliers' planning purposes, and also allows the customers a more detailed look at their usage behavior, it means a considerable risk for privacy. The detailed...
The advent of the Smart Grid brings new network management challenges and opportunities. Multiple IEEE network technologies, including 802.11, 802.15.4 and P1901 can all support Smart Grid applications in Home Area Networks (HANs). Utilities need visibility into the HAN to ensure the network is operational and able to support critical applications such as Demand Response and Electric Vehicle Charging...
This paper investigates new transmission protocols that maximize the lifetime of a network under a Quality-of- Service (QoS) constraint. The proposed schemes incorporate a Decode-and-Forward relaying strategy with an instantaneous channel feedback in order to save energy and therefore prolong the network lifetime. Based on a combination of the required average transmitted power that supports the target...
While special protection systems (SPSs) often shed load, recent sophisticated remedial action schemes (RASs) reduce or terminate generation output during an emergency condition. Under certain load conditions, generation newly added to previously balanced transmission grids creates system conditions that violate accepted reliability criteria. At Southern California Edison (SCE), RAS systems are implemented...
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