Design and implementation of initial cell search in 5G NR systems

Chen, Fatang; Li, Xiu; Zhang, Yun; Jiang, Yanan

doi:10.23919/jcc.2020.05.005

Cited by 21 publications

(11 citation statements)

References 14 publications

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“…The parameterization of the PDSCH and PUSCH based on the FRCs proposed in the standard allows users to experiment with the different configurations, which can be changed automatically at the interface according to the case. There are also some concerns such as the uncertainty of synchronization signals in the frequency domain and the flexibility of frame structure configuration, which are major challenges for the initial search of cells for the new fifth generation (5G) radio that this work does not consider and are detailed in (Chen, Li, Zhang, & Jiang, 2020) .…”

Section: Discussionmentioning

confidence: 99%

Desarrollo de un Simulador Parametrizable de 5G-New Radio basado en Ray Tracing para Planificación de Celdas Urbanas

2023

NOVASINERGIA

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En la actualidad se ha comenzado a desplegar la tecnología de banda ancha 5G New Radio. Por lo tanto, se necesitan nuevas herramientas enfocadas al estudio del estándar y las condiciones de propagación. En este contexto, se presenta el desarrollo de un simulador 5G New Radio que permite experimentar con los diferentes parámetros de las señales, así como identificar las principales características a nivel de enlace y propagación de onda. Se analizaron las partes más esenciales del estándar y se introdujeron en el software, a partir de lo cual se pudo parametrizar el Physical Downlink Shared Channel y el Physical Uplink Shared Channel. En cuanto a la planificación de celdas urbanas, se incluyen dos cálculos: i) Mapas SINR que permiten la visualización de Signal to Noise and Interference Ratio (SINR) para un número parametrizable de gNodesB, potencia de transmisión, downtilt, etc. ii) Simulación de cobertura basada en ray-tracing en mapas 3D que tiene en cuenta también la permitividad y la conductividad de los materiales de edificios y terreno. Además, para la caracterización del canal, el simulador presenta el Perfil de Retardo de Potencia (PDP), y si hay movimiento, el desplazamiento Doppler se representa en la función de dispersión. El resultado es un simulador parametrizable que integra la generación de señales de 5G-NR y cálculos de cobertura para el despliegue de celdas urbanas de 5G, con una diferencia media para el caso del ray-tracing de 7.11 dB entre los valores medidos y calculados.

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Section: Discussionmentioning

confidence: 99%

Desarrollo de un Simulador Parametrizable de 5G-New Radio basado en Ray Tracing para Planificación de Celdas Urbanas

2023

NOVASINERGIA

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“…However, due to the differences between OTFS and signal-carrier frequency division multiple access (SC-FDMA), the random access procedure in 4G/5G cannot be directly used for OTFS systems. On the other hand, the ZC sequences employed in 4G/5G have limited resistance to severe Doppler effects in higher-mobility scenarios [9]. Therefore, it is necessary to explore the RAP design and random access schemes suitable for OTFS systems.…”

Section: Related Workmentioning

confidence: 99%

Random Access Preamble Design and Timing Advance Estimation for OTFS Systems in High-Mobility Scenarios

Geng,

Zhu,

Chen

et al. 2024

Electronics

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The uplink timing synchronization is indispensable for establishing a reliable link between the base station and the user equipment (UE). To tackle this problem, a new random access preamble (RAP) waveform is designed for cellular communication systems operating in high-mobility scenarios for orthogonal time frequency space systems. Meanwhile, we also propose a scheme to detect access UEs and estimate the corresponding round-trip propagation delay (i.e., timing advance (TA)). Concretely, the RAP root sequence consists of chirp sequences in the delay-Doppler domain, and the set of available RAPs is generated by cyclic shifting the root sequence. Then, the cross-correlation in the fractional Fourier domain is carried out to achieve the RAP detection and TA estimation of the access UEs. Exhaustive numerical simulation results corroborate that the proposed scheme has a superior RAP detection and TA estimation performance and exhibits sufficient robustness regarding Doppler shifts and the number of UEs.

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“…In the proposed triple auto-correlation algorithm, the values of p and q can be taken from any group of table 1 and the correlation value is: (20).…”

Section: Fine Synchronizationmentioning

confidence: 99%

“…13. By contrast, the conventional algorithm and the fine synchronization algorithm based on CP conjugate symmetry [20] are also presented in Fig. 13.…”

Section: Figure 12 Coarse Synchronization Detection Probability In Tdl-a Channelmentioning

confidence: 99%

“…Although the complexity of the proposed algorithm is reduced, it causes a certain degree of performance loss and is not robust in the case of large carrier frequency offset (CFO). In [20], the author proposed a fine synchronization algorithm based on cyclic prefix (CP) conjugate symmetry, which improved the detection performance under a certain frequency offset, but the antinoise performance of the fine synchronization stage needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

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A Novel PSS Timing Synchronization Algorithm for Cell Search in 5G NR System

et al. 2021

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Cell search is the first step to establish downlink synchronization between user equipment (UE) and base station (BS) in the fifth generation (5G) new radio (NR) system. However, frequency offset and noise will cause a massive loss of synchronization performance. To solve this problem, a novel timing synchronization algorithm of primary synchronization signal (PSS) with anti-frequency offset and antinoise is proposed, which includes the improved coarse synchronization algorithm based on Fourier transform and the fine synchronization algorithm based on the triple auto-correlation algorithm. The improved coarse synchronization algorithm not only has a strong frequency offset resistance, especially for large frequency offset, but also obtains the estimated frequency offset. The fine synchronization algorithm is more resistant to noise than the conventional algorithm. Finally, the algorithm analysis and simulation results show that the improved algorithm can work very well even when the normalized frequency offset increases to greater than 0.8, but the conventional algorithm fails to synchronize properly. Meanwhile, when the SNR is as low as -6dB, the detection accuracy of the timing synchronization based on the proposed fine synchronization algorithm is improved by about 31.7% compared with the conventional algorithm.

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Design and implementation of initial cell search in 5G NR systems

Cited by 21 publications

References 14 publications

Desarrollo de un Simulador Parametrizable de 5G-New Radio basado en Ray Tracing para Planificación de Celdas Urbanas

Desarrollo de un Simulador Parametrizable de 5G-New Radio basado en Ray Tracing para Planificación de Celdas Urbanas

Random Access Preamble Design and Timing Advance Estimation for OTFS Systems in High-Mobility Scenarios

A Novel PSS Timing Synchronization Algorithm for Cell Search in 5G NR System

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