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Millimeter wave (mmWave) frequencies offer the potential for very large capacity increases from traditional cellular frequencies because of the incredible amount of available spectrum (e.g., 10 GHz in the E-band alone). Additionally the latest channel measurements and research have shown that mmWave frequencies are useable for a 5G-type local area access system. However, employing mmWave frequencies...
Device-to-device (D2D) connectivity is likely to represent a major enabling technology for future fifth generation (5G) radio access networks. In this paper, we introduce a new model for device cooperation in 5G radio access networks termed frequency-selective soft forwarding (FSSF). FSSF is based on soft-combining by a target user equipment (TUE) of selectively forwarded soft information data by...
A scheduling algorithm based on weighted users' correlation and fairness (WUCFS) is proposed for MU-MIMO downlink broadcast channels (BC), to address the problem that traditional fairness scheduling algorithms cannot handle, i.e., they cannot accurately compute the achievable rate for each user in their iterative user selection process, thus creating an undesirable tradeoff between user fairness and...
Massive MIMO involves the use of large scale antenna arrays for high-gain adaptive beamforming and high-order spatial multiplexing. An important design challenge in Massive MIMO systems is the acquisition of channel state information at the transmit array, where accurate channel knowledge is critical for obtaining the best performance with Multi-User MIMO transmission on the downlink. In this paper,...
Future mobile networks are converging towards being heterogeneous, owing to the co-existence of multi-tier networks within the same geographical area, including macro, pico- and femto-cells. The deployment of such networks is generally based on user demand, which is irregular and random, implying that the deployment of base stations (BSs) is random as well. As a result, analyzing the communication...
In this work, the autocorrelation and autocovariance functions of the channel state information (CSI) in a multi-cell mobile network with fast fading is derived analytically. The derivation is based on the Rayleigh fading model. A squared Bessel function is found to be a good approximation of the autocovariance. Simulations confirm both the analytical result and approximation to be accurate for short...
Envelope tracking (ET) is a significant technique to improve the efficiency of power amplifier (PA) in the power back-off region, especially in modern mobile communication system with a high peak-to-average power ratio (PAPR). Different ET implementation solutions, especially the way of choosing shaping table, have a great impact on the performance of ET system. In this paper, a transistor-level PA...
Macrocell cellular networks utilizing relay nodes with low transmission power have emerged as a new paradigm to meet the fast increasing capacity and coverage demands in Fourth-Generation-Long-Term Evolution (4G-LTE). For such a network, an efficient radio resource allocation scheme is critical to achieve a desirable mobile quality of service (QoS). This paper investigates a stepwise radio resource...
A multi-user MIMO (MU-MIMO) system configures orthogonal MIMO channels for active mobile users by use of multiple antennas of the base station (BS). Because different grouping of users can introduce different channel properties in MU-MIMO, user groupinging can minimize BS transmit power in order to satisfy an essential requirement for BS energy savings. In this paper, we discuss how such user groupinging...
This paper proposes a model for the management of virtual radio resources. The virtualisation of radio resources is based on aggregating and managing all the available physical radio resources in a set of infrastructures. In this approach, Virtual Network Operators (VNOs) use wireless connectivity in the form of capacity per service, and do not have to deal with physical radio resources at all. Due...
In this paper, we consider resource allocation optimization problem in cellular networks for different types of users running multiple applications simultaneously. In our proposed model, each user application is assigned a utility function that represents the application type running on the user equipment (UE). The network operators assign a subscription weight to each UE based on its subscription...
In this paper, we study the use of a wireless charging vehicle (WCV) to replenish energy to sensors in a wireless sensor network so that none of the sensors will run out of its energy, where sensor batteries can be recharged. Specifically, we first propose a flexible on-demand sensor energy charging paradigm that decouples sensor energy replenishment and data collection into separate activities. We...
With the advance of energy harvesting technology, more and more sensors now are powered by ambient energy. Energy harvesting sensor networks are a key step in paving the way for truly green systems that can operate ‘perpetually’ and do not adversely impact on the environment. In this paper we consider quality data collection in an energy harvesting sensor network by exploring sink mobility. That is,...
In this position paper, we identify the potential of an integrated deployment solution for energy efficient cellular networks combining the strengths of two very active research themes: software defined radio access networks (SD-RAN) [1] and decoupled signaling and data transmissions, or beyond cellular green generation (BCG2) architecture, for enhanced energy efficiency [2]. While SD-RAN envisions...
Radio frequency spectrum within 3–300 GHz has been investigated for the next generation of mobile broadband system. The mmWave mobile broadband (MMB) system is expected to achieve high capacity by utilizing immense bandwidth. However, high attenuation property of mmWave generates outage zone where the signal does not reach frequently in MMB system. To cover outage zone, relay operation has been suggested...
The proliferation of mobile services and the explosive growth of data traffic has created new challenges in cellular networks. Mobile data offloading has attracted significant attention, since it has the ability to alleviate cellular burden by using complementary resources and thus, offers better services to end users. In this paper, we introduce intelligence into heterogeneous network management...
In the recent years, a significant research effort has been devoted to the development of bandwidth estimation techniques and tools due to the broad range of possible applications. The vast majority of bandwidth estimation algorithms are designed and optimized for wired networks. Therefore, these solutions not only provide inaccurate results in wireless environments but also rely on some information...
Caching at wireless access points is a promising approach to alleviate the backhaul burden in wireless networks. In this paper, we consider a cooperative wireless caching network where all the base stations (BSs) are connected to a central controller via backhaul links. In such a network, users can get the required data locally if they are cached at the BSs. Otherwise, the user data need to be assigned...
Relay-aided cooperative communication is a critical component of next generation cellular networks as it improves coverage and boosts system capacity. In this paper, we use stochastic geometry to study the performance of partial decode-and-forward (PDF) relaying through another idle user in uplink cellular communication. We analytically derive the average inter-cell interference power caused by system-wide...
In this paper, we consider downlink resource allocation of a cellular user to group of device-to-device (D2D) communication pair to enhance the overall system throughput and achieve higher spectral efficiency in mobile cloud. A mobile cloud can be defined as an opportunistic cooperative cluster of wireless devices in close proximity which are capable to communicate to other devices while preserving...
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