Timing and synchronization in mobile telecommunication networks

Miškinis, Rimantas; Smirnov, Dmitrij; Urba, Emilis; Dzindzelwta, Bronislovas

doi:10.1109/fcs.2011.5977834

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…Apart from the above applications, many other electronic systems require frequency generators. In such systems, time synchronization and an accurate frequency are required [3,4].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nonstationary Phase Noise Using the Wigner–Ville Distribution

Levy

Pinchas

Pinhasi

2020

Mathematical Problems in Engineering

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Oscillators and atomic clocks, as well as lasers and masers, are affected by physical mechanisms causing amplitude fluctuations, phase noise, and frequency instabilities. The physical properties of the elements composing the oscillator as well as external environmental conditions play a role in the coherence of the oscillatory signal produced by the device. Such instabilities demonstrate frequency drifts, modulation, and spectrum broadening and are observed to be nonstationary processes in nature. Most of the tools which are being used to measure and characterize oscillator stability are based on signal processing techniques, assuming time invariance within a temporal window, during which the signal is assumed to be stationary. This letter proposes a new time-frequency approach for the characterization of frequency sources. Our technique is based on the Wigner–Ville time-frequency distribution, which extends the spectral measures to include the temporal nonstationary behavior of the processes affecting the coherence of the oscillator and the accuracy of the clock. We demonstrate the use of the technique in the characterization of nonstationary phase noise in oscillators.

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“…Apart from the above applications, many other electronic systems require frequency generators. In such systems, time synchronization and an accurate frequency are required [3,4].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nonstationary Phase Noise Using the Wigner–Ville Distribution

Levy

Pinchas

Pinhasi

2020

Mathematical Problems in Engineering

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“…In addition to the above applications, many other electronic systems require frequency generators. In such systems, time synchronization and an accurate clock frequency are required [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for the Characterization of Nonstationary Oscillators Using the Wigner-Ville Distribution

Levy

Pinchas

Pinhasi

2018

Mathematical Problems in Engineering

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Oscillators and clocks are affected by physical mechanisms causing amplitude fluctuations, phase noise, and frequency instabilities. The physical properties of the elements composing the oscillator as well as external environmental conditions play a role in the characteristics of the oscillatory signal produced by the device. Such instabilities demonstrate frequency drifts and modulation and spectrum broadening and are observed to be nonstationary processes in nature. Most of tools which are being used to measure and characterize oscillator stability are based on signal processing techniques, assuming time invariance during a temporal window, during which the signal is assumed to be stationary. This paper proposes a new time-frequency metric for the characterization of frequency sources. Our technique is based on the Wigner-Ville distribution, which extends the spectral measures to consist of the temporal nonstationary behavior of the processes affecting the accuracy of the clock. We demonstrate the use of the technique in the characterization of phase errors, frequency offsets, and frequency drift of oscillators.

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“…Main UMTS DTCH data channel is "sleeping" the most of the time due to low traffic. DCCH channel features large delay and asymmetry, while the results of [1] have been obtained with the modem operating in this regime most of the time. In the contrary, the UMTS DTCH channel has lower delay due to higher data transfer rate and less asymmetry.…”

Section: Resultsmentioning

confidence: 87%

“…The asymmetry of those channels is essentially different. Thus, we investigate three typical operating regimes to which the modem can be switched: UMTS DCCH channel, UMTS DTCH channel, and the HSDPA DCH logical channel over transport channel named High-Speed Downlink Shared Channel (HS-DSCH), After a repeat investigation of the UMTS DCCH channel, the reason for poor synchronization results in [1] has become clear and can be explained as follows.…”

Section: Resultsmentioning

confidence: 99%

“…Features of mobile device synchronization and time transfer first of all depends on the data transfer characteristics of mobile network. In our previous works [1,2], various characteristics of time transfer over mobile telecommunication networks were investigated. The UMTS (Universal Mobile Telecommunications System) and HSDPA (High-Speed Downlink Packet Access) channels revealed the worst results.…”

Section: Introductionmentioning

confidence: 99%

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Improving timing capabilities in 3G mobile networks

Miškinis

Smirnov

Urba

et al. 2012

2012 European Frequency and Time Forum

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Various characteristics of time transfer over 3G mobile telecommunication networks are investigated. The investigation aims at the three typical regimes in which the modem can be operated: 1) UMTS logical CTCH (Common Traffic Channel) operating over the UMTS FACH (Forward Access Channel) physical channel; 2) UMTS data transfer logical DTCH (Dedicated Traffic Channel) operating over the UMTS DCH (Dedicated Channel) physical channel; 3) HSDPA data transfer logical DTCH (Dedicated Traffic Channel) operating over the HS-DSCH (High Speed Shared Data Channel) physical channel. It is found that the most important role in the quality of synchronization and time transfer is played by the network asymmetry, not the absolute delay time.

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Timing and synchronization in mobile telecommunication networks

Cited by 4 publications

References 4 publications

Characterization of Nonstationary Phase Noise Using the Wigner–Ville Distribution

Characterization of Nonstationary Phase Noise Using the Wigner–Ville Distribution

A New Approach for the Characterization of Nonstationary Oscillators Using the Wigner-Ville Distribution

Improving timing capabilities in 3G mobile networks

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