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This paper presents a study on performance analysis of a relay-assisted downlink with resource block pairing and proportional fairness. In LTE-A and beyond relay systems, the end-to-end average capacity can be increased by ordered RB-pairing between backhaul and the access links. We derive an exact analytical expression for evaluating the average logarithmic throughput with resource block (RB) pairing...
Self-interference (SI) significantly limits the performance of full-duplex (FD) radio devices if not properly cancelled. State-of-the-art SI cancellation (SIC) techniques at the receive chain implicitly set an upper bound on the transmit power of the device. This paper starts from this observation and proposes a transmit beamforming design for FD multiple-antenna radios that: i) leverages the inherent...
It is expected that in two-tier LTE heterogeneous networks, an extensive deployment of small cell networks (SCNs) will take place in the near future, especially in dense urban zones; hence a hyper density of SCNs randomly distributed within macro cell networks (MCNs) will emerge with many overlapping zones of neighboring SCNs. Therefore, the problems of interferences in co-channel deployment will...
In order to cope with the phenomenal growth of mobile data traffic, unlicensed spectrum can be utilized by the Long Term Evolution (LTE) cellular systems. However, ensuring fair coexistence with WiFi is a mandatory requirement. In one approach, periodically configurable transmission gaps can be used to facilitate a coexistence between WiFi and LTE. In this paper, a Multi-Armed Bandit (MAB) based dynamic...
Wireless powered communication networks are becoming an effective solution for improving self sustainability of mobile devices. In this context, a hybrid access point transfers energy to a group of nodes, which use the harvested energy to perform computation or transmission tasks. While the availability of the wireless energy transfer mechanism opens up new frontiers, it also requires an appropriate...
The potential commercialization of the 5 GHz U-NII bands with unlicensed LTE technologies has sparked considerably debate throughout the wireless industry and beyond. This paper will look at the current state of investigations into the ability of unlicensed LTE technologies to coexist cooperatively with incumbent Wi-Fi implementations and discuss some of the implications involved.
We built up a Long Term Evolution (LTE) trial system operating in 5.8 GHz unlicensed bands and conducted a real time field trial in typical indoor environments. The user throughput of LTE with the 20MHz carrier in the unlicensed bands, which is used as a Supplemental Downlink (SDL) (always downlink), is evaluated and compared with that of Wireless Local Area Network (WLAN) with the same bandwidth...
Wireless powered communication networks are becoming an effective solution for improving self sustainability of mobile devices. In this context, a hybrid access point transfers energy to a group of nodes, which use the harvested energy to perform computation or transmission tasks. While the availability of the wireless energy transfer mechanism opens up new frontiers, it also requires an appropriate...
Non-Orthogonal Multiple Access (NOMA) is considered as a promising downlink Multiple Access (MA) scheme for future radio access. In this paper two power allocation strategies for NOMA are proposed. The first strategy is based on channel state information experienced by NOMA users. The other strategy is based on pre-defined QoS per NOMA user. In this paper we develop mathematical models for the proposed...
Mobile devices have been augmented by Multi-path TCP (MPTCP), enabling them to exploit the path diversity. Signal aware MPTCP (SA-MPTCP) takes the signal quality, playing a significant role in energy waste, into account to enhance MPTCP energy consumption. The problem is formulated as a decision making problem under uncertainty, endeavoring to optimize energy efficiency by selecting the best policy...
Full-duplex radio allows signals to be transmitted and received simultaneously by utilizing Self-Interference Cancellation (SIC). At a maximum, it can double the throughput of traditional half-duplex systems. To enhance throughput as much as possible, it is important to utilize downlink and uplink transmissions simultaneously. This paper proposes Hidden Chain MAC protocol, which improves throughput...
We consider a novel way by which DL dynamic MAC scheduling can be augmented based on cross-layer inputs to provide desired performance enhancements. We describe ODDS, an automated design process for the data-driven refinement of downlink resource scheduling algorithms. ODDS extracts insights from the behavior of a simulated LTE cellular system under randomized traffic patterns and propagation conditions...
Sharing Transmission Opportunity period (TXOP) technique is recently defined by IEEE 802.11ac to allow simultaneous downlink transmissions. In this paper, we focus on the basis of this technique and the behavior of the access point (AP) to manage the multi-user access. We discuss the different steps required to allow simultaneous downlink transmissions. Based on simulation results, we prove that TXOP...
An uplink scheduler in the Long Term Evolution (LTE) network has the objective to improve the radio resources utilization in the network. The choice of uplink scheduling procedure used impacts the throughputs of individual users, as well as the overall throughput of the cell. This paper evaluates and compares the performance of three well-known LTE uplink schedulers (namely, Maximum Throughput (MT),...
In this paper, we propose a distributed, self-organizing, adaptive and semi-static Soft Frequency Reuse based downlink Inter-Cell Interference Coordination scheme for an LTE system to increase the throughput of cell-edge users. Cells are able to self-organize the allocation of frequency sub-bands for cell-edge users using a distributed algorithm without requiring extensive pre-planning needed for...
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...
We investigate the joint resource allocation problem for both downlink and uplink transmissions in a wireless-powered sensor network. Cooperation among the sensor nodes is considered in the uplink to overcome the performance loss of the sensor nodes that are far from the access point. Since the joint optimization problem of power and subcarrier allocation and relay selection is mixed-integer nonlinear,...
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 an increasing use of Long-Term Evolution (LTE) in mobile networks, it is necessary to evaluate its performance. In this paper, we evaluate the performance of Long Term Evolution (LTE) for mobile networks under Transmission Control Protocol (TCP) traffic. We evaluate the performance of LTE for TCP traffic for both the directions uplink as well as downlink. During the evaluations, we focus on the...
Smart electronic gadgets are used to increase the data usage in recent mobile communications. But, the spectrum efficiency cannot be increased in terms of data rates in 4G LTE. To improve this high data rates, it is essential to improve the bandwidths (≤ 100 MHz) using multiple carrier or channel since it is not possible by single channel or carrier. For improving data rates high, here it is utilized...
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