scholarly journals A novel method for the codecs’ performance analysis in mobile telephony systems

2020 ◽  
Vol 33 (2) ◽  
pp. 243-259
Author(s):  
Aleksandar Lebl ◽  
Dragan Mitic ◽  
Vladimir Matic ◽  
Mladen Mileusnic ◽  
Zarko Markov
Keyword(s):  
Quality Of Service ◽  
Flow Rate ◽  
Mobile Communications ◽  
Voice Quality ◽  
Mobile Telephony ◽  
Mobile Telecommunication ◽  
Telecommunication System ◽  
Full Rate ◽  
Novel Method

This paper presents a novel method of expressing the quality of service in a mobile telecommunication system when its performance depends on several factors including applied codecs? characteristics (voice quality and data flow rate) and telecommunications traffic service possibilities. The influence of these factors is unified in one variable - quality of service measure. The proposed method is especially applicable in the cases when two-dimensional systems are analyzed - for example when two codecs with different flow rate and different achievable connection quality are used in a system. As an example, we also studied system with full-rate or mixed full-rate and half-rate codec implementation depending on the offered traffic. The system performances - mean dataflow and mean connection quality as a function of offered traffic are presented graphically and also expressed quantitatively by the novel quality of service measure. The systems with different number of available traffic channels may be compared on the base of this novel evaluation value such that the system with the highest value is the most suitable one for the concrete situation. In this way mobile system design is simplified to the great extent. The developed model is applicable generally for mobile telephony systems defining, but in this paper we studied its implementation for Global System for Mobile communications.

scholarly journals Long Term Evolution (LTE) Network Evaluation in the South-West Region of Nigeria

2019 ◽  
Vol 4 (3) ◽  
pp. 86-92
Author(s):  
Bamidele Moses Kuboye
Keyword(s):  
Quality Of Service ◽  
Mobile Communications ◽  
Network Architecture ◽  
The South ◽  
Telecommunication System ◽  
Lte Network ◽  
West Region ◽  
South West ◽  
South West Region

The LTE broadband evolved from an earlier Third Generation Partnership Project system which is known as the Universal Mobile Telecommunication System (UMTS), which evolved from the Global System for Mobile Communications (GSM). The network architecture of this system has been designed with the aim to support a packet-switched traffic with seamless mobility and great quality of service. The main goal of the LTE is to provide a high data rate with low latency and a packet optimized radio access technology that supports deployment of bandwidth. Hence, this study is based on the evaluation of the LTE network in the south-west region of Nigeria. This study evaluates the LTE network strength in the South-West region of Nigeria. Questionnaires were administered among users in these areas randomly. Thereafter, data were analyzed and research questions were answered from the analyzed results. The results showed that 9Mobile and MTN has the best quality of service of LTE network in South-West, Nigeria, also that the LTE network has not really been active in Osun and Ekiti states.

scholarly journals Implementation of RF Band-Pass Filter on UMTS Systems to Improve Quality of Service

2019 ◽  
Vol 7 (2) ◽  
pp. 31-49
Author(s):  
Nyoman Gunantara ◽  
Made Adi Surya Antara ◽  
NMAE Dewi Wirastuti
Keyword(s):  
Quality Of Service ◽  
Communication Networks ◽  
Band Pass Filter ◽  
Interference Effects ◽  
Mobile Telecommunication ◽  
Telecommunication System ◽  
Pass Filter ◽  
Access Rate ◽  
Band Pass

A large number of cellular operators in an area causes high interference effects. One indicator is the problem with received total wideband power (RTWP) found in a universal mobile telecommunication system (UMTS). High RTWP is one of the causes of a decrease in the quality of service (QoS) in cellular communication networks. To solve this problem, an RF band-pass filter device can be implemented on a UMTS system, where RF band-pass filters have been designed and tested in previous studies. In this research, the RF band-pass filter was installed between the BTS node and bottom jumper. After implementing it, QoS measurements with the Huawei M2000 application and Drive Test were carried out. The QoS analysis included RTWP, Circuit-Switched access rate, Packet-Switched access rate, and Received Signal Code Power (RSCP) value. The results show that the RTWP value decreases, while the CS access rate, PS access rate, and RSCP value increase. These results indicate that QoS on the UMTS increases.

scholarly journals A Hybrid Approach to Call Admission Control in 5G Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Mohammed Al-Maitah ◽  
Olena O. Semenova ◽  
Andriy O. Semenov ◽  
Pavel I. Kulakov ◽  
Volodymyr Yu. Kucheruk
Keyword(s):  
Artificial Intelligence ◽  
Quality Of Service ◽  
Admission Control ◽  
Mobile Communications ◽  
Communication Systems ◽  
Call Admission Control ◽  
Hybrid Approach ◽  
5G Networks ◽  
Call Admission

Artificial intelligence is employed for solving complex scientific, technical, and practical problems. Such artificial intelligence techniques as neural networks, fuzzy systems, and genetic and evolutionary algorithms are widely used for communication systems management, optimization, and prediction. Artificial intelligence approach provides optimized results in a challenging task of call admission control, handover, routing, and traffic prediction in cellular networks. 5G mobile communications are designed as heterogeneous networks, whose important requirement is accommodating great numbers of users and the quality of service satisfaction. Call admission control plays a significant role in providing the desired quality of service. An effective call admission control algorithm is needed for optimizing the cellular network system. Many call admission control schemes have been proposed. The paper proposes a methodology for developing a genetic neurofuzzy controller for call admission in 5G networks. Performance of the proposed admission control is evaluated through computer simulation.

scholarly journals Optimization of Log-Periodic TV Reception Antenna with UHF Mobile Communications Band Rejection

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1830
Author(s):  
Keyur K. Mistry ◽  
Pavlos I. Lazaridis ◽  
Zaharias D. Zaharis ◽  
Ioannis P. Chochliouros ◽  
Tian Hong Loh ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Mobile Communications ◽  
Lower Cost ◽  
Mobile Services ◽  
Poor Quality ◽  
Antenna Design ◽  
Log Periodic Antenna ◽  
4G Lte ◽  
Tv Broadcasting

The coexistence of TV broadcasting and mobile services causes interference that leads to poor quality-of-service for TV consumers. Solutions usually found in the market involve external band-stop filters along with TV reception log-periodic and Yagi-Uda antennas. This paper presents a log-periodic antenna design without additional filtering that serves as a lower cost alternative to avoid interference from mobile services into the UHF TV. The proposed antenna operates in the UHF TV band (470–790 MHz-passband) and rejects the 800 MHz and 900 MHz bands (stopband) of 4G/LTE-800 and GSM900 services, respectively. Matching to 50 Ohms is very satisfactory in the passband with values of S11 below −12 dB. Furthermore, the antenna is highly directive with a realized gain of approximately 8 dBi and a front-to-back ratio greater than 20 dB.

scholarly journals Hybrid intelligent model for real time assessment of voice quality of service

2020 ◽  
Vol 9 ◽  
pp. e00491 ◽  
Author(s):  
Jacob O. Mebawondu ◽  
Folasade M. Dahunsi ◽  
Olumide S. Adewale
Keyword(s):  
Quality Of Service ◽  
Real Time ◽  
Voice Quality ◽  
Intelligent Model ◽  
Time Assessment

scholarly journals Assessment of Call Voice Quality of GSM Network Operators in 5 Cities in Kwara State

2019 ◽  
pp. 1-7
Author(s):  
K. O. Kadiri ◽  
Samuel Oluwaseun Lawal ◽  
Olawale Saheed Babatunde
Keyword(s):  
Quality Of Service ◽  
Network Performance ◽  
Positive Impact ◽  
Voice Quality ◽  
Success Rates ◽  
International Telecommunication Union ◽  
Perceptual Evaluation ◽  
Gsm Network ◽  
Set Up

This paper evaluates voice quality of four Global System for Mobile (GSM) Communication providers in five selected cities in Kwara State with thoughtfulness of network performance evaluation and the quality of service (QoS) improvement of GSM network system. Three assessment components/parameters which are network accessibility, service retainability and connection quality for evaluating QoS on the network were mainly adopted. The parameters were applied on four GSM networks in the studied areas using customers’ complaints method. Also, a standard method known as Perceptual Evaluation of Speech Quality (PESQ) — (International Telecommunication Union-Telecommunication Standardization Sector) ITU-T standard P.862, used for measuring call voice quality and Mean Opinion Score (MOS) is adopted. The two methods were therefore compared to assess call voice quality of the four GSM networks. The Key Performance Indicators (KPIs) on which the GSM networks were tested include call set-up success rates (CSSR), call drop rate (CDR), call completion success rates (CCSR), handover success rates (HSR) and traffic channel congestion rate (TCHR). The result of the study shows that the Quality of Service of GSM system in the selected cities is unreliable. The study also shows that the GSM network accessibility and retainability in the country are unsatisfactory. However, the call voice quality was observed to be on the peak in these cities across the four network providers. At the end of this manuscript, suggestions are given on how to advance both the Quality of Service and the positive impact of GSM network in the selected areas and the country as a whole.

Location-Based Network Resource Management

2011 ◽  
pp. 865-888 ◽  
Author(s):  
Ioannis Priggouris ◽  
Evangelos Zervas ◽  
Stathes Hadjiefthymiades
Keyword(s):  
Quality Of Service ◽  
Resource Management ◽  
Mobile Communications ◽  
Mobile Network ◽  
Direct Consequence ◽  
Research Area ◽  
Network Resource ◽  
Network Resource Management ◽  
Near Future

The vision that wireless technology in the near future will provide mobile users with at least similar multimedia services as those available to the fixed hosts is quite established today. Towards this direction, extensive research efforts are underway to guarantee Quality-of-service (QoS) in mobile environments. An important factor that affects the provisioning of resources in such environments is the variability of the environment itself. From the user’s perspective, this variability is a direct consequence of the user’s movement and, at any given time, a function of his position. Exploiting the user’s location to optimally manage and provision the resources of the mobile network is likely to enhance both the capacity of the network and the offered quality of service. In this chapter, we aim to provide a general introduction to the emerging research area of mobile communications, which is generally known as location-based network resource management.

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