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The current static model used for allocating the spectrum of frequencies and the increasing demand for network resources imposed by modern applications and services may lead to a resources scarcity problem. Dealing with this problem demands optimized resources allocation. An alternative to provide this optimization is by allowing resources sharing among network operators. In this paper, an architecture...
5G networks are expected to support significantly higher data rates than legacy networks through ultra-dense deployment of networks, higher system bandwidths and higher spectral efficiency. Such networks would also be supporting a diverse set of use cases in order to provide connectivity solutions for other industry verticals. One of the key requirements of 5G is to support all these enhancements...
Latency is key in today cellular networks. The latest 3GPP Release 14 includes a future work item to shorten the Transmission Time Interval of LTE networks from 1ms to 0.5ms in order to lower the overall system latency. Towards achieving such goal, this paper proposes a mechanism to reduce the latency of mobile cellular systems, while improving the throughput, by leveraging the benefits of the two...
There is desire for public safety networks to meet the increasing demands for sharing images or videos among first responders and incident commanders more effectively. Long term evolution (LTE) is considered to be a candidate for achieving such broadband services. However, out-of-coverage areas tend to happen at the cell edge areas or inside buildings because the cell areas of each base station for...
After a disaster, it is unlikely to expect current terrestrial infrastructures to provide the coverage and the Quality of Service required by emergency operators. Currently, PPDR operators go towards a portable LTE infrastructure that provides an access network to field operators, backhauled by a wireless mesh network that can route traffic from and towards Internet through a satellite gateway. We...
To address the mobile data growth challenges, mobile operators need to access more spectrum resources. LTE in unlicensed spectrum (LTE-U) has been proposed to extend the usual operation of LTE in licensed spectrum to cover also unlicensed spectrum, mainly at 5 GHz band due to its wide spectrum availability. However, this extension poses significant challenges especially regarding the coexistence between...
Latest research in smart grid communications has advocated the aggregation of multiple traffic flows in order to achieve an improved throughput. While aggregation improves the overall throughput, the individual flows still suffer from unfair throughput performance. As a result, the enablers for time sensitive smart grid services such as load-shedding that require a timely report of data are the most...
As a profound and evident future trend in the field of mobile communication technologies development, heterogeneous networks became one of the crucial points of interests in wireless networks industry and academic research societies. Considering heterogeneous networks as an inseparable concept from LTE networks nowadays, which remain at position of advanced cellular system, the researchers aim to...
Joint transmission (JT) is one of multi-cell coordination schemes for efficient support of cell-edge users. In order to achieve high capacity based on JT, it is required to appropriately allocate transmit power such that it does not incur interference to other cells. In this paper, we propose a power allocation algorithm for JT based on multilateral bargaining model. The discount factor is defined...
In current LTE deployments, the unsupervised and unilateral installation of home or localized base stations, so called eNodeBs, may easily lead to excessive energy consumption and over-provisioning of network infrastructure. In this paper, we propose an energy efficient framework, which dynamically adjusts the power requirements of the system and performs Resource Block (RBs) allocation based on needs...
Long Term Evolution (LTE) Networks are being planned to be upgraded to LTE Advanced along with increasing availability of Release 10 User Equipment (UEs) and Spectrum Availability for Carrier Aggregation. LTE Advanced brings a major step increase in Down Link and Uplink Throughputs and related spectral efficiencies. This paper explains the evolution of Frequency Division Duplex (FDD) throughputs for...
Offloading the LTE data services to unlicensed spectrum has been considered by 3GPP in Release 13, which is defined as LAA (Licensed-Assisted Access). Unlicensed band is attractive because of its large amount of spectrum resource. However, coexisting with wireless devices already existing in unlicensed spectrum (such as Wi-Fi) is a primary issue be solved effectively. This paper proposed two dynamic...
Since mobile terminals such as smartphones are basic information tools for users, their communication performance is always significant. Modern loss-based Transmission Control Protocols (TCP) take aggressive congestion window (CWND) control strategies in order to gain better throughput, but such strategies may cause a large number of packets to be backlogged and eventually dropped at the entry point...
An EUTRAN offers Multi-Point connectivity from base station (eNB) toward the UE for reliable connection under mobility. This enhances the user experience with committed throughput. Radio resource allocation is a complex arrangement of resources in multiuser scenario, and it became more cumbersome if UE offer optional or alternative path to connect the network. Generally in network radio resources...
Carrier Aggregation (CA) is one of the most important techniques that enables LTE-Advanced network access to have faster and more reliable data rate. This technique allows telecommunication operators to use more than one carriers simultaneously and therefore enables higher network capacity. Inter-band CA is one of three CA techniques that is available right now. This type of CA enables user to aggregate...
Machine-Type-Communication (MTC), also known as Machine to Machine (M2M) communication is one of the emerging technologies in mobile broadband networks such as LTE (Long Term Evolution) known as a key technology for the future. Several problems occur in the presence of massive M2M communications, such as the congestion at the radio access because of simultaneous signals or data messages sent from...
Quality of service (QoS) requirements have paved the way to a great deal of research about scheduling and resource allocation mechanisms. The fairness and throughput maximization have been considered as classical techniques. These techniques fail to fit with different QoS requirements over the Long Term Evolution (LTE) systems. These QoS requirements are presented in the form of scheduling priorities,...
Multi-hop relaying has been considered as a key technology for future wireless communication networks to overcome coverage and capacity problems in 5th generation mobile networks (5G). Recently, there has been increasing interest from 3GPP operators to integrate multi-hop relaying functionalities into LTE-A standards. However, many issues remain to be resolved due to the complexity of the multi-hop...
This paper presents an iterative contending-user estimation method to analyze the normalized throughput, the packet-dropping probability, the average access delay, and the variance of the access delay for finite-population slotted ALOHA system supporting multiple access-class traffic. We demonstrate the way to extend the model to accurately predict the access delay of small data transmissions in OFDMA...
In LTE, resource scheduling algorithm is one of the key parameters that determine the overall system and UE performances in terms of throughput and fairness respectively. Multiple scheduling techniques are available that emphasizes on optimizing any one of the key system performance parameters. Among them the most potential algorithms are proportional fair (PF) and round robin (RR). PF optimizes UE...
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