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We consider the dynamic resource management and allocation with respect to users' personalized quality requirements in dynamic orthogonal frequency division multiple access (OFDMA) networks with time varying wireless channels and bursty traffic. We first propose a new performance metric for evaluating the degree of user's satisfaction with respective to its personalized quality requirement. We then...
In heterogeneous wireless networks, it is common for service providers to employ multiple radio access technologies (RATs) to meet the requirements of the quality of services and as well to improve the system performance. In this paper, we propose an optimal resource allocation scheme for heterogeneous wireless networks by maximizing the users' quality of experience (QoE), which is a widely used subjective...
A distributed link scheduling scheme with cross-layer design is conceived based on the physical interference model for controlling the congestion in multihop wireless networks. Link scheduling and nonlinear power control problem are analyzed based on the physical interference model and a distributed algorithm is designed to accomplish the rate allocation and the link scheduling. The algorithm is tested...
As the advance of technologies, the smart phone makes the context-aware more easily. And context awareness is an important factor to be considered for content personalized recommendation. Most traditional recommendation systems only take the user preferences into account, which leads to low content prediction recommendation accuracy. In this paper, we conceive a context-aware media content personalized...
In this paper, a novel load balancing scheme is conceived for the OFDMA LTE cellular and WiFi coexisted network. The mobile index is introduced to measure the mobility of user equipments (UE) in the coverage of WiFi hotspots and the access index is calculated by considering both mobile index and the received power from WiFi access points (AP) to determine the UE's access pattern. The load balance...
In this paper, a fast content distribution scheme is proposed with QoS provisions and user cooperation in cellular networks. A group of mobile terminals (MTs), which are interested in the same content, can cooperate to reduce the content distribution time (CDT). The Nash bargaining solution was derived to formulate the content distribution problem, where each player of the game can maximize its individual...
In this paper, we conceive an energy-efficient power and subcarrier allocation scheme for downlink OFDMA systems under average delay constraints. The services associated with multi-users have different packet arrivals and delay requirements. The problem of dynamic power and subcarrier allocation is formulated as a constrained Markov decision process (CMDP) with control actions based on the joint states...
We investigate the impact of the node-selfishness on the network connectivity and the path delay of information dissemination in large scale Ad-hoc networks based on the percolation theory. A network framework with links obeying stationary process is conceived by combining the effects of both node-selfishness and link qualities. The existence of the node cooperation probability boundary is proved...
A window based channel allocation scheme is conceived for two-way AF relay aided OFDMA systems. Two users communicating with each other via a specific relay constitute a user-pair. At most one channel index with its channel gain lying within a window, given the left and the right thresholds, is reported to the relay by each user at a time. If two users of a user-pair send non-identical channel indices,...
In this paper, we investigate the data diffusion for mobile wireless networks using percolation theoretic approaches. By considering the impacts of both node mobility and the willingness of node for the message on the data diffusion probability, we employ a one-dependent percolation model to characterize and analyze the diffusion of data on a general directed and locally finite graph. To model the...
In this paper, a cell zooming based dynamic base stations (BS) switching scheme is conceived for energy saving in cellular networks. A cell zooming algorithm is developed for leveraging the BS's coverage with inter-cell cooperation and downlink power control. Meanwhile, we design a feasible working strategy for the cell zooming scheme to maximizing the energy saving. Simulations are provided to demonstrate...
We conceive a fair resource allocation scheme for multiuser multiple relay aided OFDMA networks. We study the optimization problem of subcarrier assignment under outage constraints. The outage constraints are transformed into the power constraints of the relays. A priority based proportional fairness multiuser scheduling approach is employed to achieve the complimentary rate fairness of all users...
In this paper, a supermodular game theoretic approach is investigated for spectrum sharing in cognitive radio networks. We consider a Bertrand competition model, in which primary service providers compete to sell their spare spectrum and then to maximize their individual profits. We demonstrate that the Bertrand competition is a smooth supermodular game, and a round-robin optimization algorithm is...
In this paper, a joint power and subchannel allocation strategy is investigated for relay-aided multi-cell OFDMA networks. The problem is formulated for maximizing the network throughput with minimal bandwidth cost under the users' minimum rate constraints. The method of Benders' Decomposition is employed to decompose the complicated problem into two subproblems, which solves the subchannel and power...
We propose an efficient resource allocation scheme for OFDMA based femtocells networks under imperfect channel knowledge. Several femtocell users share the same spectrum but no interference exists between each other. The transmit power of femtocell users is minimized under the users' QoS constraints. Based on the interference channel model of femtocell users, an accurate interference estimation approach...
In the paper, we investigate the Cooperation based Adaptive Decentralized self-management (CADSM) scheme for Ad hoc networks. The characteristics of the approach are that there is no manager or agent, and the network management is performed under the cooperation of all nodes. Since the network load is shared over all nodes, it avoids the bottleneck happened in traditional management scenarios. A dynamic...
In wireless relay networks, the source selects relay nodes to help forward the signal to the destination. The selection is performed under the relays' reported information (e.g., amplitude of channel gain). Since the information is the private of relays, the source will not be able to tell whether the reported is true or not. Thus, the autonomous relays may expect to report fake information to maximize...
Cooperative multi-cell transmit strategies typically require full channel state information (CSI) at the base station. Most previous works in this area have assumed that base stations have common knowledge of both data dedicated to all terminals and full or partial CSI of all links. In this paper, a more practical limited-feedback scenario is studied for multi-cell joint beamforming. The proposed...
In this paper, the auction theory based power allocation is investigated for relay communications, wherein all relays bid for the transmit power from a server. A target BER at the destination is introduced as the power-bidding criterion to guarantee the received signal's availability. For maximizing the revenue, all relay nodes compete for the limit power resource and attain the Nash equilibrium....
We analyze the outage performance of the cooperative relay with the decode- and-forward protocol under Rayleigh fading channels. The technique of orthogonal space–time block coding is applied at the links of source-relay, source-destination and relay-destination. A closed-form expression for the outage probability is derived. Simulation results demonstrate the theoretical solutions.
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