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In this paper, we investigate the performances of schedulers, which basically allocate the resources to multiple users based on different algorithms, in multiple-input multiple-output (MIMO) and orthogonal frequency division multiple access (OFDMA) based cellular wireless networks. In addition to conventional OFDMA resources which are time and frequency, antennas are also considered as resource during...
Long Term Evolution network or LTE network is a 4G network extension that provides higher data rate by combining multiple technologies and channels through a demand based selection of the appropriate one. This implements an evolved node base station (eNB). The Integrated eNB's in 4G network are responsible for seamless switching between different technologies and channels. Such a switching decision...
The rise in mobile data traffic demands from indoor users (UEs) coupled with poor cellular coverage in indoor environments, triggering the growth of Femto cell deployments. However, due to densification of Femtos, frequency reuse one, and lack of coordination among Femtos in LTE HetNets, cell-edge users of Macro cells, who are in the vicinity of Femtos, get affected by cross-tier interference of the...
Long Term Evolution (LTE) boasts several throughput enhancing techniques like optimized MAC layer protocols, better modulation schemes, spatial multiplexing, carrier aggregation, etc. Although these techniques allow LTE to offer data rates as high as 300 Mbps, LTE is expected to fall short of consumer expectations due to the exponentially increasing user data demands. In a bid to cope with the increasing...
Small cells, novel low-powered base stations with local range, are nowadays investigated in order to improve the radio coverage and capacity in macro cell layer. The radio frequency exposure induced in such cells is unknown. Hence, we assess in this paper, through experimental measurements, the impact of an LTE small cell cluster on the radio frequency exposure induced by a mobile handset. With respect...
Licensed Assisted Access (LAA) has been proposedby 3rd Generation Partnership Project (3GPP) in order touse Long Term Evolution (LTE) in the un-licensed band. Asthe centralized control of LAA has to co-exist with existingdistributed Wireless Fidelity (WiFi), efficient Listen Before Talk(LBT) technique is required to reduce interference and improvespectral efficiency. In this paper, we have proposed...
The 4:th generation communication standard is constantly evolving with more features being added to the standard specifications. Carrier aggregation and higher order MIMO are examples of features used to support higher data rates. The addition of features puts new requirements on wireless devices and this increasing complexity implies that Over-the-Air testing is more important than ever. At the same...
A method for off-peak transfer of data, by which user equipment (UE) autonomously shifts a peak load on a base station, is proposed and evaluated. In regard to the proposed method, how UE monitors the load on a base station is a significant problem. To solve this problem, a novel method of passively estimating the resource block (RB) usage rate of a serving cell on the basis of radio conditions measured...
With the congestion and scarcity of available spectrum resources, spectrum sharing between long-term evolution (LTE) and the IEEE 802.11 (aka. WLAN) systems is an ongoing research topic. Considering the LTE license assisted access (LAA) with the listen before talk (LBT) procedure, recent research efforts try to evaluate the performance in several LTE-LBT and WLAN coexistence scenarios. However, the...
This paper proposes an enhanced adaptive control cell range expansion (CRE) technique in heterogeneous networks to increase the system capacity and improve the user throughput. The enhanced adaptive control CRE technique is operated by both the user equipment (UE) connection ratio to pico cells in the macro cell and the received SINR for UEs. The features of the proposed CRE technique are described...
The exponentially increasing demand for higher data rates has pushed the mobile network operators and researchers to scout for ways to improve the system bandwidth, most notably by using the unlicensed band which already hosts long-standing technologies like Wi-Fi. Of late, some effort has gone into exploring the performance of Licensed-Assisted Access (LAA) which can boost the bandwidth of LTE by...
An experimental evaluation of an LTE Cognitive Radio (CR) Network, implemented using highly integrated Software Defined Radio (SDR) platform is presented. Each transceiver can be configured as a primary (resp. secondary) eNodeB or a primary (resp. secondary) user in this framework. We propose simple distributed algorithms which the secondary eNodeB can employ to efficiently manage the spectral opportunities...
A tighter coupling [1] between LTE and Wi-Fi interfaces can be achieved by integrating them at the radio protocol stack. LTE Wi-Fi radio level integration with IPsec tunnel (LWIP) is one such architecture introduced in Rel.13 of 3GPP. We have developed a variant of LWIP prototype and made commercial UE to readily work with the LWIP. The developed LWIP testbed uses OpenAirInterface (OAI) for LTE network...
Base Stations (BSs) in LTE networks face heavy traffic demand from User Equipments (UEs) for voice, online gaming, video calls, file transfers, etc., We consider a LTE Device-to-device (D2D) network where LTE UEs have primary access to the spectrum and D2D pairs have secondary access. In order to offload traffic from BS and to enhance spectral efficiency, operators can activate multiple D2D pairs...
Unlimited voice services no longer command premium pricing, but are viewed as “table stakes” in a broader service offering that must now include multimedia (voice, data, video) communications with a mobility component. As a result of this shift, many service providers are trying to adopt, Long Term Evolution (LTE) network strategy to deliver this multimedia experience to their subscribers [1]. Today,...
3GPP has been working in establishing a new network infrastructure based on unlicensed spectrum known as LTE Secondary Cell (SCell) in a carrier aggregation scenario in which LTE user terminals would still be anchored to an LTE Primary Cell (PCell) over licensed spectrum. On this scenario, best-effort content would be delivered on the unlicensed band SCell, while QoS traffic and control signaling...
In this paper, we propose, a new scheduling algorithm for LTE-A uplink systems entitled Multi-user Resource Allocation Process (MURAP). The latter supports uplink multi-user transmissions. Indeed, the main contribution of this work is to allocate the Physical Resources Blocks (PRBs) of all Component Carriers (CCs) to Real Time (RT) and-non Real Time (NRT) users using various criteria. Our proposed...
With the introduction of 4G/5G technologies it seems possible to overcome the limitation to transmit high quality image/video for the deployment of Telemedicine services. A scenario of remote hospital is considered to study the effect of simultaneously transmitting medical data, images and video. In order to achieve high video compression at reduced sampling rate, a joint Compressed Sensing-SPIHT...
In this paper we have studied downlink packet scheduling algorithms proposed for LTE cellular networks. The study emphasize on six most promising scheduling algorithms such as: FLS, EXP rule, LOG rule, PF, MLWDF, EXP/PF.
With the prevailing of mobile phones and online video contents, the demand for mobile online video is increasing. The desire, however, is held down by the high mobile traffic cost. To solve this problem, an off-the-shelf solution is WiFi-Direct (WFD), which is widely available on a majority of mobile devices. There is, however, no systematic study of WFD-based group data transfer and cooperative video...
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