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Hybrid division duplex (HDD) can be a key technology for new Heterogeneous Network (HetNet) architectures based on two-tier frequency division duplex (FDD) macro-cell and time division duplex (TDD) femtocell deployments. We propose coordinated interference management techniques that work in the presence of uplink power control in HDD to further enhance network performance. The proposed mechanisms...
Interference due to multi-channel CR hidden terminals and edge PU receivers at link level has direct impact on performance of CR-MAC protocol. State-of-the-art research in CR-MAC propose sequential, cluster-CCC coverage for In-band and global CCC coverage for out-of-band spectrum to avoid primary (PU) and secondary (CR) hidden terminals. But, imperfect node synchronization due to per hop and group...
We study the joint resource allocation problem of a mobile heterogeneous network composed of macro cellular users and Device-to-Device (D2D) links. Macro cellular users are always scheduled on uplink shared resources, whereas D2D links may use uplink shared resources, orthogonal resources reserved exclusively for D2D transmissions, or a combination of both types of resources. A sum utility maximization...
Device-to-device (D2D) communication enables users lying in close proximity to bypass the cellular base station (BS) and transmit to one another directly. This offloads traffic from the cellular network, improves spatial frequency reuse and energy efficiency in the network. We present a comprehensive and tractable analytical framework for D2D-enabled uplink cellular networks with two different flexible...
Network-facilitated device to device (D2D) communication is expected to play a central role in 5th generation cellular systems, as this allows to substantially reduce the end-to-end latency in mission-critical communication use cases, but also to obtain network and spectral efficiency improvements through the exploitation of proximity gains, hop gains and reuse gains in mobile broadband scenarios...
Load balancing through proactive offloading users onto small cells is critical for tapping the potential of dense heterogeneous cellular networks (HCNs). However, the impact of such offloading on the uplink performance is not well understood, primarily due to the lack of tractable models. Uplink power control and spatial interference correlation further complicate the mathematical analysis as compared...
Self-powered, energy harvesting small cell base stations (SBS) are expected to be an integral part of next-generation wireless networks. However, due to uncertainties in harvested energy, it is necessary to adopt energy efficient power control schemes to reduce an SBSs' energy consumption and thus ensure quality-of-service (QoS) for users. Such energy-efficient design can also be done via the use...
In this paper, after discussing the challenges raised by the increasing density of IEEE 802.11 WLANs, we investigate a new combination of transmit power control and physical carrier sensing adaptation to leverage the spatial reuse in high density deployments. While each of these techniques when applied separately is efficient in enhancing the performance of such dense scenarios, they suffer from serious...
Unlicensed LTE system holds high potential to effectively offload data traffic/video traffic from the crowded LTE networks. Listen-before-talk is generally necessary for unlicensed LTE to coexist with existing transmissions in the unlicensed band (e.g. wireless LAN). This paper studies the interaction of clear channel assessment (how hard one should listen before talk) and transmit power control (how...
Investigation in MIMO-RSN (Multi-input Multi-output radar sensor networks) is becoming more attractive in current literature. In a MIMO system, power allocation in accordance with the channel gain can significantly improve the system throughput performance. This paper investigates three power allocation methods in MIMO-RSN: water-filling, equal power and channel inversion. Their performances are analyzed...
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