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Cognitive radio is emerging as a promising technique to improve the utilization of the radio frequency spectrum in wireless networks. In this paper, we propose a hybrid CR (cognitive radio) system where underlay and overlay CR approaches are combined under SINR (Signal to Interference plus Noise Ratio) constraints. This new access type allows to optimize the spectrum sensing time with throughput improvement...
Game-theory based carrier sense multiple access (CSMA) protocols for wireless networks have recently emerged as a competitive alternative to classical CSMA based medium access control designs. The advantage of game-theory based approaches lies in the scope of precise mathematical analysis and hence predictable performance compared to approaches based on ad-hoc arguments and heuristics. In this poster,...
This paper addresses the channel selection problem for Long Term Evolution Unlicensed (LTE-U). Channel selection is a frequency-domain mechanism that facilitates the coexistence of multiple networks sharing the unlicensed band. In particular, the paper considers a fully distributed approach where each small cell autonomously selects the channel to set-up an LTE-U carrier. The problem is modeled using...
Femtocell provides better QoS for indoor mobile users by enhancing the signal strength. For efficient indoor coverage traditional macrocell network is over laid with femtocells. Both this macrocell and the femtocells operate in same frequency band. Spectrum, a limited resource needs to be shared efficiently between macrocell and femtocells. In this approach a method for spectrum sharing between adjacent...
This paper investigates the joint power control and subchannel allocation problem for device-to-device (D2D) and small cell uplink communications in a cellular network to improve the cellular throughput. For this considered throughput maximization problem, we propose to solve it leveraging a game-theoretic learning approach. However, there is an intractable issue for obtaining the optimal power allocation...
Many spectrum sensing techniques have been proposed to allow a secondary user (SU) to utilize a primary user's (PU) spectrum through opportunistic access. However, few of them have considered the tradeoff between accuracy and energy consumption by taking into account the selfishness of the (SUs) in a distributed network. In this work, we consider spectrum sensing as a game where the payoff is the...
Due to Orthogonal Frequency Division Multiple Access (OFDMA) mechanism adopted in LTE cellular networks, intra-cell interference is nearly absent. Yet, as these networks are designed for a frequency reuse factor of 1 to maximize the utilization of the licensed bandwidth, inter-cell interference coordination remains an important challenge. In both homogeneous and heterogeneous cellular networks, there...
We conduct in this work a comparative study betweena greedy versus limited proposals for resource aggregationin the backhaul of wireless local area networks. We consider asetting with several access points, some with excess backhaulcapacity (providers), and others in shortage of it (beneficiaries) and investigate two approaches for the distribution of resourcesbetween them: a greedy one wherein each...
Cognitive Radio Networks (CRNs) provide a convenient way to access under-utilized TV bands for wireless radio users. Different co-located networks must have to coexist by accessing different parts of the incumbent free available spectrum in an opportunistic manner. In this paper, we propose a fully distributed non-cooperative game theoretic scheme for resource scheduling in self-coexisting cognitive...
Channel bonding enables a transmitting device to form a wide channel in order to facilitate high data rate. From IEEE 802.11n, which is the most generally deployed wireless local area network standard, channel bonding feature has been widely applied. However, prior studies have reported that the wide channel does not always guarantee high data rate since a node using wide channel width might deprive...
In multi-tier cellular/small cell networks, decoupled uplink-downlink association (DUDe) enables a user to be associated with different base stations (BSs) for uplink (UL) and downlink (DL) transmissions. In this paper, we consider the overall UL and DL rate maximization problem of the users in such a network with a provisioning for decoupled association. In particular, we formulate the UL and DL...
With the explosive growth in wireless usage due in part to smart phones, tablets and a growing applications developer base, wireless operators are constantly looking for ways to increase the spectral efficiency of their networks with low power. Multiple input/ multiple output (MIMO) technology, which made its first broad commercial appearance in IEEE 802.11 systems, is now gaining substantial attention...
This paper uses a novel set of functions to model the relay selection process in a scenario of cooperative wireless communications. We define a utility function that reflects the behavior and influence that a selected relay may have on the quality of the link to be established for the forwarding of data. The utility function takes into account also the strategies of other players. To this end, we...
In multi-tier cellular/small cell networks, user performance is largely affected by the varying transmit powers, distances, and non- uniform traffic loads of different BSs in both the downlink (DL) and uplink (UL) directions of transmission. To optimize user performance in such networks, decoupled UL-DL association (DUDe) has recently been investigated. DUDe enables a user to be associated with different...
IEEE 802.11 is one of the most common technologies these days. Due to its simplicity and easy integration in various applications its usage in recent years has grown exponentially [1]. The increasing amount of wireless devices and various applications such as WBAN (Wireless Body Area Networks), WISPs (Wireless internet service provides) have increased the interference in unlicensed band, which reduced...
Device-to-device (D2D) communications have recently been considered as promising means to enhance resource utilization of cellular network. In this paper, we investigate joint channel assignment and power allocation to maximize utility of cellular users as well as throughput of every D2D pair, while guaranteeing minimal transmission rate of cellular users from a Nash bargaining theory point of view,...
In this paper we study the channel selection problem with dynamic users in distributed opportunistic spectrum access systems. Different with the ordinary assumption that users have data to transmit all the time, we assume that users transmit data randomly in each slot. The dynamical transmitting model makes the active number of users time-varying and channel interference levels dynamic. It makes a...
We investigate the QoE-centric heterogeneous network selection problem. Users usually struggle for the maximum throughput when select access network. However, compared to QoS-centric optimization mechanism, in order to get more rational allocation of resources and improve the resource utilization, we seek the QoE optimization method mechanism instead. The core idea of QoE-centric optimization is to...
This paper investigates the problem of co-tiered interference mitigation for small cell networks, in which most small cell base stations (SBSs) are deployed in an ad-hoc manner with minimum intervention from the end users and the service providers. Some game approaches are proposed to solve such problem distributedly. However, in most existing studies (include game approaches), a central controller...
Greedy users deviate from the IEEE 802.11 Distributed Coordination Function (DCF) standards to unfairly increase their shares of the bandwidth on the expense of other standard-abiding users. The greedy behavior is implemented by modifying the firmware of the network interface card to manipulate the back-off timer. This paper presents a methodology using non cooperative game theory to formulate a countermeasure...
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