Solution to Reduce Voice Interruption Time during Handover of VoLTE Call in Enhanced Single Radio Voice Call Continuity

2015 ◽  
Author(s):  
Sumit Gautam ◽  
Durga Prasad Sharma
Keyword(s):  
Voice Call ◽  
Single Radio

scholarly journals PENENTUAN WAKTU DAN METODE IMPLEMENTASI VOLTE PADA JARINGAN LTE (STUDI KASUS DI TELKOMSEL)

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Enov Tikupasang ◽  
Nurul Hiron ◽  
Imam Taufiqurrahman
Keyword(s):  
Monte Carlo ◽  
Voice Call ◽  
Single Radio ◽  
4G Lte

Teknologi 4G LTE diimplementasikan untuk meningkatkan kualitas dan speed layanan data, image perusahaan, dan interoperability dengan operator lain. Penelitian ini menganalisis VoLTE sebagai alternatif layanan voice di atas jaringan LTE dengan keterbatasan bandwidth frekuensi, tetapi kontribusi layanan voice yang masih tinggi pada studi kasus di Telkomsel. Penggunaan VoLTE merupakan tahapan selanjutnya setelah voice CS fallback. Tujuan dari penelitian ini adalah membangun sebuah model untuk menilai kelayakan implementasi  VoLTE  dengan berbagai skenario waktu dan metode teknologi dalam rangka menurunkan nilai risiko dari implementasi LTE, sehingga dapat menentukan waktu dan metode yang tepat bagi implementasi fitur layanan VoLTE pada jaringan LTE dengan dua cara yaitu sistem SRVCC (Single Radio Voice Call Continuity) atau langsung pada sistem PS handover. Metoda penelitian yang digunakan adalah komplementer atau triangulation dengan ilmiah dan alamiah, dengan menggunakan statistik regresi, variabel acak berlainan, perhitungan bandwidth, dan nilai bisnis. Disamping itu untuk menghitung nilai risiko dari probabilistik ketidakpastian, maka digunakan analisis sensitivitas dan analisis risiko melalui simulasi Monte Carlo. Hasil yang diharapkan adalah optimalisasi dan efisiensi penggunaan bandwidth serta pembuktian hipotesis tentang studi kelayakan proyek implementasi layanan VoLTE.

Multiple Access using Time Modulated Array with Single RF Chain

2019 ◽  
Vol 12 (5) ◽  
pp. 395-401
Author(s):  
Xu He ◽  
Yuan Ding ◽  
Gaojian Huang
Keyword(s):  
Power Efficiency ◽  
Multiple Access ◽  
Narrow Band ◽  
Average Power ◽  
Access Technology ◽  
Signal Peak ◽  
Single Radio ◽  
Rf Chain ◽  
Synthesis Approach ◽  
Single Rf Chain

Background: A new wireless multiple access technology enabled by using Time Modulated Arrays (TMAs) is proposed in this paper. Methods: It benefits due to the requirement of only a single Radio Frequency (RF) chain, compared with other multiple-RF-chain schemes. Results: As a result, it is able to greatly reduce the system cost, energy consumption, and complexity. Conclusion: In addition, the signal through the single RF chain is narrow-band modulated, reducing the signal Peak-to-Average-Power-Ratio (PAPR), thus, further enhancing the power efficiency of the RF chain, especially for power amplifiers. The operation principle and synthesis approach are elaborated in this paper, and are demonstrated with two examples.

scholarly journals A Survey for Recent Techniques and Algorithms of Geolocation and Target Tracking in Wireless and Satellite Systems

2021 ◽  
Vol 11 (13) ◽  
pp. 6079
Author(s):  
Abulasad Elgamoudi ◽  
Hamza Benzerrouk ◽  
G. Arul Elango ◽  
René Landry
Keyword(s):  
Target Tracking ◽  
Satellite Communication ◽  
Interference Mitigation ◽  
Global Navigation Satellite Systems ◽  
Military Operations ◽  
Satellite Systems ◽  
Disturbance Source ◽  
Single Radio ◽  
Novel Algorithms ◽  
Global Navigation Satellite

A single Radio-Frequency Interference (RFI) is a disturbance source of modern wireless systems depending on Global Navigation Satellite Systems (GNSS) and Satellite Communication (SatCom). In particular, significant applications such as aeronautics and satellite communication can be severely affected by intentional and unintentional interference, which are unmitigated. The matter requires finding a radical and effective solution to overcome this problem. The methods used for overcoming the RFI include interference detection, interference classification, interference geolocation, tracking and interference mitigation. RFI source geolocation and tracking methodology gained universal attention from numerous researchers, specialists, and scientists. In the last decade, various conventional techniques and algorithms have been adopted in geolocation and target tracking in civil and military operations. Previous conventional techniques did not address the challenges and demand for novel algorithms. Hence there is a necessity for focussing on the issues associated with this. This survey introduces a review of various conventional geolocation techniques, current orientations, and state-of-the-art techniques and highlights some approaches and algorithms employed in wireless and satellite systems for geolocation and target tracking that may be extremely beneficial. In addition, a comparison between different conventional geolocation techniques has been revealed, and the comparisons between various approaches and algorithms of geolocation and target tracking have been addressed, including H∞ and Kalman Filtering versions that have been implemented and investigated by authors.

scholarly journals DESIGN OF THE USABILITY MEASUREMENT TOOL FOR MULTIMODAL MOBILE APPLICATIONS

2015 ◽  
Vol 77 (29) ◽  
Author(s):  
Ahmed Sheikh Abdullah Al-Aidaroos ◽  
Ariffin Abdul Mutalib
Keyword(s):  
User Interface ◽  
Mobile Phones ◽  
Mobile Applications ◽  
Daily Life ◽  
The Other ◽  
Three Dimensions ◽  
Measurement Tool ◽  
Evaluation Instrument ◽  
Voice Call ◽  
Goal Question Metric

Nowadays, mobile phones provide not just voice call and messaging services, but plethora of other services. Those computational capabilities allow mobile phones to serve people in various areas including education, banking, commerce, travelling, and other daily life aspects. Meanwhile, the number of mobile phone users has increased dramatically in the last decade. On the other hand, the usability of an application can usually be verified through the user interface. Therefore, this paper aims to design a measurement tool to evaluate the usability of mobile applications based on the usability attributes and dimensions that must be considered in the interface. To obtain the appropriate attributes, a Systematic Literature Review (SLR) has been conducted and the Goal Question Metric (GQM) has been used to design the tool. From 261 related works only 18 most relevant ones were selected, through four SLR. 25 dimensions were found through the SLR, but some of these dimensions are synonymous or a part of other dimensions. Consequently, three dimensions must be included in any usability evaluation instrument, which is broken down into ten sub dimensions.

scholarly journals A Search for Single Radio Pulses and Bursts from Southern AXPs

2008 ◽  
Author(s):  
F. Crawford ◽  
J. W. T. Hessels ◽  
V. M. Kaspi ◽  
C. Bassa ◽  
Z. Wang ◽  
...  
Keyword(s):  
Single Radio

scholarly journals FRATs: Searching for fast radio transient in real-time with LOFAR

2012 ◽  
Vol 8 (S291) ◽  
pp. 233-233
Author(s):  
Heino Falcke ◽  
Keyword(s):  
Time Scales ◽  
Search Space ◽  
Large Field ◽  
New Radio ◽  
Wide Range ◽  
Imaging Observation ◽  
Previous Decade ◽  
First Results ◽  
Single Radio ◽  
Radio Transients

AbstractLOFAR is an innovative new radio interferometer operating at low radio frequencies from 10 to 270 MHz. It combines a large field-of-view, high fractional bandwidth, rapid response, and a wide range of baselines from tens of meters to thousand kilometers. Its use of phased-array technology and its digital nature make LOFAR an extremely versatile instrument to search for transient radio phenomena on all time scales. Here we discuss in particular the search for fast radio transients (FRATs) at sub-second time scales. In fact, at these time scales the radio sky is rather dynamic due to coherent emission processes. Objects like pulsars, flaring stars, or planets like Jupiter are able to produce bright short flares. For pulsars, most previous detection strategies made use of the rotation of pulsars to detect them, using Fourier techniques, but it is also possible to detect pulsars and other objects through their single pulses. Such surveys have, e.g., led in the previous decade to the detection of Rapid Radio Transients (RRATS), but the unprobed search space is still rather large. LOFAR is now conducting a rather unique survey over the entire northern sky, searching for bright dispersed single radio pulses. This FRATs survey makes use of the LOFAR transient buffer boards (TBBs), which had initially been used to detect nanosecond radio pulses from cosmic rays. The TBBs store the radio data from each single receiver element of LOFAR and allow one to look back in time. A trigger system that runs parallel to normal imaging observation allows one to detect single pulses in an incoherent beam of all LOFAR stations, covering several tens to hundred square degrees at once. Once triggered, the data can be used to localize the pulse and to discriminate cosmic sources from terrestrial interference through 3D localization. The system has been successfully tested with known pulsars and first results of the ongoing survey will be presented.

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