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This paper identifies two energy saving opportunities of Wi-Fi interface emerged during smartphone's screen-off periods. Exploiting the opportunities, we propose a new power saving strategy, BackPSM, for screen-off Wi-Fi communications. BackPSM regulates client to send and receive packets in batches and coordinates multiple clients to communicate at different slots (i.e., beacon interval). The core...
As the rapid growth of the data traffic, the mobile cellular network is under unprecedented operation pressure. Various of small cells with relay technologies have been proposed to bypass increased data with the status of the limited base station so far. Therefore, vehicular small cell gradually are attracting the attention of the researchers. In this paper, we discuss the communication model of the...
Energy balance is a critical issue in wireless sensor networks. Several mixed data transmission (MDT) schemes have been proposed to achieve energy balance. However, most existing works are lack of theoretical study, especially understanding the relationship between network-wide energy balancing and lifetime optimization. In this paper, we conduct comprehensive theoretical analysis to the two-level...
In energy-harvesting wireless sensor networks, sensor nodes equipped with a harvesting device scavenge the valuable energy from ambient environments. In this paper, we consider the routing problem of jointly considering the distance, the remaining energy and energy-harvesting capability of sensor nodes with the objective to route the collected data toward the sink node by going through the high-density...
The explosive growth of smart mobile user equipments (UEs) boosts the emerging of numerous mobile applications. Most of these applications require an always-online connectivity, which incurs overly-frequent Radio Resource Control (RRC) state transitions, leading to signaling storm and user access failure. To address this issue, many researches focus on avoiding frequent transitions between RRC states...
In the smart grid system, dynamic pricing can be an efficient tool for the service provider which enables efficient and automated management of the grid. However, in practice, the lack of information about the customers' time-varying load demand and energy consumption patterns and the volatility of electricity price in the wholesale market make the implementation of dynamic pricing highly challenging...
In this paper, we focus on designing energy-efficient opportunistic multicast scheduling method and user sleeping mechanism for scalable video transmission in a wireless network. The goal is to minimize the total energy consumption for receiving video data with bandwidth constraint and users' minimum QoS requirements. To utilize opportunistic multicast scheduling, unequal erasure protection (UXP)...
Wireless multimedia sensor networks (WMSNs) are expected to find wide applicability in target tracking in the near future. This paper proposes a dynamic capacity multi-path routing protocol (DCM), based on improved Ford-Fulkerson algorithm, to solve the problem of data transmission from anchor nodes to base station (BS). By adjusting the parameter of flow capacity in max-flow model, a multi-path routing...
A novel node management strategy is proposed in this paper to solve the target tracking problem for wireless image sensor networks. The node management server is responsible for forecasting the target position, selecting the node to collect image data, and broadcasting control messages to all nodes. After the node sensor receives the messages sent from the server, the node sensor will start the camera,...
In this work, we propose a collaborative image transmission based on shape matching over WMSN in field of monitoring. First, the SensEye's node model is utilized to lessen the transmission of background from the nodes. After the nodes detect a same target during shape matching, the transmission of the redundant data of the targets between nodes is eliminated. In order to reduce the delay produced...
An Energy-efficient Node Selection (ENS) mechanism has been proposed to improve the localization precision of target tracking with low computational complexity and energy consumption. The localization is based on wireless multimedia sensor network with cellular topology. The ENS mechanism utilizes the Global Node Selection algorithm in Energy-based acoustic source localization (GNSE) and the Closest...
The energy consumed by topology maintenance could be higher than that in the initialization stage and the cost will increase steadily with the turns of maintenance process. Therefore, when design a self-organization protocol for WSN, not only initialization cost should be considered but also the maintenance cost in the whole lifetime. Moreover, to reduce the footprint on system resource, the maintenance...
This paper endeavors to present a comprehensive summary of the causes and effects of three-phase unbalance and discusses the energy efficiency in the balance condition and the unbalance condition. To correct the unbalance problems, a new topology structure of SVC is proposed. The energy efficiency is analyzed by an actual experiment with the compensation of the new SVC. And the experimental result...
Existing cooperative schemes in which cluster head selects its neighboring intra-cluster nodes to collaboratively transmit its data can obtain higher energy efficiency in cluster-based wireless sensor networks (WSNs), but it brings lower spectrum efficiency. In this paper, we propose a novel cooperative transmission scheme based on code superposition in cluster-based WSNs. This scheme doesnpsilat...
In this paper, we propose a novel cooperative node selection scheme in wireless sensor networks that operate in energy-constrained environment. This scheme can obtain higher energy efficiency than the traditional cooperative transmission, which only considers the residual energy of intra-cluster nodes or the channel condition. Our proposed scheme will combine the residual energy with the link quality...
For communication between the cluster head node (CHN) and the distant data fusion center (DFC) with the cooperation of intra-cluster nodes in wireless sensor networks (WSNs), reliable handling of packets by the cooperative node (CN) is difficult to ensure. In this paper, we propose a novel CN selection scheme based on trust for WSNs. This scheme can choose one of high trust nodes to assist in the...
Energy is the vital source for the UWB-Ad hoc system. For the characteristics of UWB-Ad hoc system, it has some particular requests to the MAC layer. Accordingly, it is necessary to find out the affection of MAC protocols to the performance of UWB-Ad hoc system. In this paper, kinds of MAC protocols that are all rate-controlled were studied. And performance curves were gotten. Also, a general model...
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