Influence of High Priority Users on the System Capacity of Mobile Networks

2007 ◽  
Author(s):  
Andreas Fernekess ◽  
Anja Klein ◽  
Bernhard Wegmann ◽  
Karl Dietrich
Keyword(s):  
Mobile Networks ◽  
System Capacity

scholarly journals Enhancing capacity of optical links using polarization multiplexing

2019 ◽  
Vol 51 (9) ◽  
Author(s):  
Nada Badraoui ◽  
Tibor Berceli
Keyword(s):  
Mobile Networks ◽  
Polarization Mode Dispersion ◽  
Phase Shifters ◽  
Coherent Detection ◽  
System Capacity ◽  
Optical Links ◽  
Mode Dispersion ◽  
Polarization Multiplexing ◽  
Polarization Phase ◽  
5G Mobile Networks

Abstract 5G mobile networks targets wireless connection capacity up to 10 Gb/s. For this purpose, we propose a method to considerably increase capacity. In this paper first, we show how to compensate the effects of polarization mode dispersion (PMD) in systems with double polarizations where PMD in such systems could cause fluctuations in optical transmission due to crosstalk and cross phase modulation. Second, we show how to enhance system capacity benefiting from polarization multiplexing (POL-MUX) technique which can provide double bandwidth efficiency. Based on the simulation results, we have achieved optimum system performance and we were able to reduce the PMD effect using pre- and post-compensation. We also have improved the POL-MUX technique using coherent detection in case of 16/64 QAM modulations. The results were achieved by implementing polarization controllers, polarization beam combiners and splitters, as well as polarization phase shifters.

scholarly journals OVERVIEW OF OPTIMIZATION ALGORITHMS FOR UAVS POSITIONING

2021 ◽  
Vol 20 (4) ◽  
pp. 46-53
Author(s):  
Adrián STOSIL ◽  
◽  
Marcel VOLOŠIN ◽  
Taras MAKSYMYUK ◽  
Gabriel BUGÁR ◽  
...  
Keyword(s):  
Mobile Networks ◽  
Base Station ◽  
Base Stations ◽  
System Capacity ◽  
End User ◽  
Widespread Application ◽  
High Bandwidth ◽  
Time Required ◽  
And Control ◽  
Different Levels

Mobile broadband networks can provide a reliable and flexible communication channel. User requirements can come with different levels of specificity. The widespread application of unmanned aerial vehicles (UAVs, commonly known as a drones) introduces possibilities of use in modern upcoming mobile networks; for example, 5G and 6G, to achieve and support various use cases from low latency to high bandwidth scenarios. For reliable command and control communication, mobile networks can provide flexible differentiated QoS matching the needed reliability, latency and throughput. Many end user equipment connected to the same base station can overload the system and may cause the network to be unavailable. Also, in case the fixed infrastructure is partially decommissioned, destroyed or the network is congested and the system capacity is not sufficient, it is appropriate to use autonomous drones as mobile base stations to ensure well signal coverage of the affected area. The aim of this work is to overview of optimization algorithm developed to provide the best drones’ locations. We compared the techniques of minimization of the number of drones needed to cover users located in a given area with respect to the time required to calculate the optimal positions of the drones.

NB-IoT for 5G

2021 ◽  
pp. 352-372
Author(s):  
Laxmi Sharma
Keyword(s):  
Mobile Networks ◽  
Low Cost ◽  
Living Environment ◽  
System Capacity ◽  
Battery Life ◽  
High Data ◽  
Fifth Generation ◽  
Data Rates ◽  
Iot Devices ◽  
New Applications

It is expected that internet of things (IoT) will deal with the major activities in the connected living environment as well as the industrial processes. All these aspects are going to be real in the frameworks of the fifth-generation (5G) mobile networks. 5G-based narrowband IoT (NB-IoT) networks have the capability to serve various innovative IoT applications at a great extent. NB-IoT is third generation partnership project (3GPP) standardized low power wide area (LPWA) technology which is designed for IoT devices requiring long battery life, low cost, worldwide coverage, and high system capacity. To improve the performance, 3GPP has agreed that the NB-IoT will continue evolving as part of the 5G specifications. NB-IoT along with 5G will work in several connected living applications. This combination will also be very useful in the industrial environments which need high data rates and low latency. All these features will be supported by 5G in the future. Similarly, applications with low data rates in the IoT world will be supported by NB-IoT. So 5G and NB-IoT are going to be a popular combination for several new applications.

scholarly journals Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks

2020 ◽  
Vol 9 (4) ◽  
pp. 48
Author(s):  
Kento Fujisawa ◽  
Fumiya Kemmochi ◽  
Hiroyuki Otsuka
Keyword(s):  
Adaptive Control ◽  
Mobile Networks ◽  
Mobile Systems ◽  
System Capacity ◽  
System Level ◽  
Cell Range Expansion ◽  
Fifth Generation ◽  
Heterogeneous Mobile Networks ◽  
User Throughput ◽  
Fixed Cell

Heterogeneous networks (HetNets), which are combined with a macrocell and picocell in the same coverage, are expected to further increase the system capacity in fifth-generation mobile systems and beyond. In HetNets, the cell range expansion (CRE) technique plays an important role and can allow more user equipment (UE) to access the picocell, i.e., virtually expand the picocell coverage. However, conventional CRE techniques that provide a fixed cell selection offset (CSO) for all UE may worsen user throughput if UE is forced to connect to the picocell because the received signal-to-interference plus noise ratio of the UE becomes lower. Therefore, we propose a personal picocell scheme using an adaptive control CRE technique to improve user throughput in which different CSOs are assigned to UE to form each optimal picocell for each UE. In this paper, we first describe the aspects and algorithm of the proposed scheme. Then, we show the user throughput for adaptive control CRE in comparison with conventional CRE by using system-level computer simulations for the two types of HetNets, i.e., single-band and multi-band HetNets. In the simulations, we first clarify the optimal parameters of the adaptive control CRE. We then show the average and 5-percentile user throughput of the optimized adaptive control CRE in comparison with that of conventional CRE. From these results, we confirmed that the personal picocell scheme using the adaptive control CRE can improve the 5-percentile user throughput while maintaining the average user throughput compared with that of conventional CRE.

scholarly journals A Gain-Computation Enhancements Resource Allocation for Heterogeneous Service Flows in IEEE 802.16 m Mobile Networks

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Wafa Ben Hassen ◽  
Meriem Afif
Keyword(s):  
Resource Allocation ◽  
Real Time ◽  
Mobile Networks ◽  
Heterogeneous Data ◽  
Ieee 802.16 ◽  
System Capacity ◽  
Fourth Generation ◽  
Computation Method ◽  
Service Access ◽  
Total System

This paper deals with radio resource allocation in fourth generation (4G) wireless mobile networks based on Orthogonal Frequency Division Multiple Access (OFDMA) as an access method. In IEEE 802.16 m standard, a contiguous method for subchannel construction is adopted in order to reduce OFDMA system complexity. In this context, we propose a new subchannel gain computation method depending on frequency responses dispersion. This method has a crucial role in the resource management and optimization. In a single service access, we propose a dynamic resource allocation algorithm at the physical layer aiming to maximize the cell data rate while ensuring fairness among users. In heterogeneous data traffics, we study scheduling in order to provide delay guaranties to real-time services, maximize throughput of non-real-time services while ensuring fairness to users. We compare performances to recent existing algorithms in OFDMA systems showing that proposed schemes provide lower complexity, higher total system capacity, and fairness among users.

scholarly journals Performance Analysis of Radio over Fiber Simulation Model using DPSK Modulation Technique

2019 ◽  
Vol 8 (2) ◽  
pp. 5117-5119
Keyword(s):  
Performance Analysis ◽  
Simulation Model ◽  
Mobile Networks ◽  
Radio Over Fiber ◽  
System Capacity ◽  
Differential Phase Shift ◽  
High Data ◽  
Large Bandwidth ◽  
Wireless Broadband ◽  
Shift Keying

In this paper, performance analysis of radio over fiber (ROF) system has been proposed to analyze the performance of the system using differential phase shift keying method. RoF Systems exhibits the unique characteristic of combining the featuring of fiber optic link and free space radio path which brings many advantages and challenges to new mobile networks. RoF systems has the provision of large bandwidth and has fewer losses for the transmission that make the ROF suitable for the future wireless broadband services and fulfill demands of high data rate. The proposed simulation model helps in improving the system capacity and their effects on the output in terms of Q factor, minimum BER is analyzed by using optisystem software.

scholarly journals Mode Selection Mechanism to Enable Effective Device-to-Device Communication System over Different Environments

2019 ◽  
Vol 13 (04) ◽  
pp. 33 ◽  
Author(s):  
Feras Zenalden ◽  
Suhaidi Hassan ◽  
Adib Habbal
Keyword(s):  
Mobile Networks ◽  
Mode Selection ◽  
Base Station ◽  
User Preferences ◽  
Outdoor Environment ◽  
D2d Communication ◽  
System Capacity ◽  
Selection Mechanism ◽  
Device To Device ◽  
Simple Additive Weighting

<span lang="EN-GB">Device-to-Device (D2D) communication is an important component of the 5G mobile networks. D2D communication enables users to communicate either directly without network assistance or with minimum signalling information through a base station (BS). Hence, D2D communication can enhance system capacity, increase spectral efficiency, improve throughput and reduce latency. One of the main challenges in D2D communications that when a potential D2D pair can switch between direct and conventional cellular communications, there lies a challenge in identifying D2D mode selection between communicating devices (i.e. a D2D pair). This paper aims to evaluate the mode selection mechanism in different environments (indoor, outdoor). The mode selection mechanism is proposed using multi-criteria for decision-making technique, the mode selection mechanism based on Simple Additive Weighting (SAW) algorithm is used to wisely connect and switch between the available modes. The evaluation of the proposed mechanism for indoor environment and outdoor environment shows better performance based on user preferences.</span>

scholarly journals Nonorthogonal Multiple Access for Next-Generation Mobile Networks: A Technical Aspect for Research Direction

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Muhammad Hussain ◽  
Haroon Rasheed
Keyword(s):  
Mobile Networks ◽  
Mobile Communications ◽  
Interference Cancellation ◽  
Multiple Access ◽  
Research Direction ◽  
Technical Aspect ◽  
Base Station ◽  
System Capacity ◽  
Rate System ◽  
High Data

5G mobile communications offer several benefits, which include providing extremely low latency, very high data rates, significant improvement in the number of users, and increase in base station capacity and perceived quality of service. This may be achieved at the cost of an increased receiver complexity by nonorthogonal access of users. Nonorthogonal multiple access (NOMA) is one of the capable contenders to achieve the vision of 5G wireless communications. Supporting a higher number of users than available orthogonal resources is the key feather of NOMA. In this article, the basic principle of NOMA has been reviewed and compared with other orthogonal multiple access (OMA). A comprehensive survey is presented in the latest NOMA scheme. The distinguished NOMA schemes design principle features, and recent deployments are discussed. Furthermore, the performance is compared in terms of the bit error rate, system capacity, and energy efficiency. The performance results show that NOMA can achieve the required goals, in terms of the user data rate, system capacity, interference cancellation scheme, and reception complexity.

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