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This paper studies the exact per node throughput capacity of a MANET, where the transmission power of each node can be controlled to adapt to a specified transmission range v and a generalized two-hop relay with limited packet redundancy f is adopted for packet routing. Based on the concept of automatic feedback control and the Markov chain model, we first develop a general theoretical framework to...
OFDMA-based mobile relay enhanced cellular networks which have lower infrastructure cost and larger coverage areas are important technologies for the next generation communication systems since they allow to communicate at higher data rates. However, it is required to develop efficient radio resource management algorithms in order to reveal these advantages. Thus, in this study, relay selection and...
Due to the introduction of wireless relays, the performance of LTE-A system was enhanced. Meanwhile, more energy was expensed and more interference was brought in. This is because the frequency used by relays may be the same or adjacent with the other relays or base stations. And the more stations deployed in a cell, the more energy consumed. In this paper, we proposed a novel green quasi-dynamic...
Mobile devices today such as netbooks, tablet PCs and smart phones provide user-friendly interfaces for people to capture live video. However as a viewer, they prefer not to share downloaded clips due to the limited computing power, upload bandwidth and mostly due to the high power consumption while scheduling segments. In this paper, we discuss the possibility of allowing mobile clients run as free...
This paper firstly introduces the architecture of cellular relaying networks, and describes the additional handover scenarios in the networks. Then the handover model of cellular relaying networks is made, the traditional handover algorithm based on absolute threshold value and hysteresis level is introduced. On this basis, we propose a novel handover algorithm based on movement state for cellular...
We consider data-streaming from an access point to multiple receivers, which is modeled as packet erasure channel. A simple network coding is shown to achieve larger rate region than without network coding, using minimal control information. The performance is characterized exactly using state transition graph. The scheme is then mapped to an information theoretic formulation for broadcast channel...
The traditional routing protocols fail to work in incompletely connected ad-hoc networks and a mobile node may fail to be controlled because the link breaks off in such network. This paper proposes a proactive relay routing mechanism. A node that has packets to send depends on one or more intermediate nodes to relay packets to destination node; source node can maintain communication link between it...
Data management in mobile peer to peer (M-P2P) systems needs dynamic data management due to mobility and fragile wireless connection connecting resource constraint devices. Traditional methods of data management and services in mobile P2P environment generally assume all peers to cooperate. Since peer activities in M-P2P are not generally monitored, users assume that they are free to use the resources...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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...
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