Synchronization Procedure in 5G NR Systems

This work reports a common indoor experimental coexistence performance analysis among 5G New Radio (5G NR), 4G Long Term Evolution Advanced Pro (LTE-A Pro) and Narrowband Internet of Things (NB-IoT), using co-channel and adjacent channels in the 700 MHz Band. The required frequency offset for the 4G and 5G generations simultaneous operation has been evaluated, as a function of the modulation scheme in order to minimize the adjacent channel interference. A suitable management of the numerology and allocating time-frequency resources, configuring CORESET, enables a peaceful coexistence, as well as high performance for all evaluated systems. Experimental results demonstrate an efficient spectrum sharing of 10 MHz-bandwidth for a 5G NR, an LTE-A Pro and three NB-IoT downlink carriers, aiming to take advantage of 700 MHz propagation aspects for the current 4G and future 5G. Constellation and error vector magnitude (EVMRMS) in accordance to the 3GPP requirements reinforce the successful 4G and 5G spectrum refarming implementation.

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“…The cyclic prefix is scaled by a factor of . Particularly, the LTE CP length is 4.7 µs [29][30][31].…”

Section: Coexistence Using Co-channelsmentioning

confidence: 99%

Indoor Coexistence Analysis Among 5G New Radio, LTE-A and NB-IoT in the 700 MHz Band

2020

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“…(2) Very recently, there were investigations in the open literature to introduce how the ICS in NR system operates [14], [30]- [34]. However, as opposed to the significance of NR TCS design on the mobile station modem, there is still no study to deal with the issue in depth.…”

Section: Volume X 2020mentioning

confidence: 99%

“…Citation information: DOI 10.1109/ACCESS.2020.3003012, IEEE Access SeungHwan Won et al: Accepted Paper for IEEE ACCESS the corresponding UE. Then, based on the above-mentioned, the following is to update the connection via the strongest selected beam among the existing candidates [14], [140] which enables handover, beam adaptation, and beam failure recovery procedures. Specifically, the beam failure recovery stage is activated as soon as a UE recognizes deterioration of quality on a NR Node-B's transmit beam, which allows to request a switch to a different beam having the best possible quality.…”

Section: B Beam Operation In Target Cell Search Working At Mmw Spectmentioning

confidence: 99%

“…In the aforementioned 3G, 4G, and 5G systems, the first operational stage of mobile communication systems is the Initial Cell Search (ICS), commenced by the User Equipment (UE) 1 for the sake of attaining both the appropriate time and frequency synchronizations as well as of identifying a serving cell ID. In order to substantially diminish the entire cell search complexities and the related power consumption, hierarchical cell search procedures have been suggested and used in all the systems covered in [4], [7]- [14]. After ICS procedure, which is activated for the initial synchronization to detect a best possible serving cell, the Target Cell Search (TCS) is invoked for detecting adjacent cells required to support potential handovers and guaranteeing seamless mobility.…”

Section: Introductionmentioning

confidence: 99%

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Three Decades of 3GPP Target Cell Search through 3G, 4G, and 5G

Won

Choi

2020

IEEE Access

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This survey provides the reader with the open literature on the detailed operational scenarios of Target Cell Search (TCS) in both 3G and 4G systems, with a particular emphasis on the DownLink (DL). There is no completely latest survey of the TCS scenarios. Therefore, we examine the TCS-involved solutions which have been chosen for Wideband-Code Division Multiple Access (W-CDMA), Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), Long-Term Evolution Frequency Division Duplex (LTE-FDD), and Time-Division Long-Term Evolution (TD-LTE). Especially for TD-SCDMA, there is no concrete literature demystifying the details of TCS scenario. Accordingly, this survey aims for repairing the associated crack in the literature. Moreover, as a recent evolution from the operational systems, we also focus on the TCS scenario which can be exploited in New Radio (NR) systems operating at both sub-6 GHz and millimeter-Wave (mmW) spectrum bands. A taxonomy diagram is also provided to classify relevant target cell search scenarios in 3G, 4G, and 5G as well as followed by those in inter-Radio Access Technologies (RATs). In a nutshell, our endeavors definitize the first comprehensive survey on the TCS progress tailored to the evolution of commercial mobile communication systems over three decades. It is worth mentioning that this survey is also informative for engineers and researchers to design practical mobile station modem.

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“…Once a cyclic prefix removal and OFDM demodulation through IFFT processing have been accomplished, the receiver have to perform an estimation and correction of residual Sample Time Offset (STO) and Carrier Frequency Offset (CFO) [15]. A need for residual synchronization error correction arises from nonideal adjustment of OFDM FFT window and carrier center frequency done by the UE based on synchronization signal bursts [16]. Both CFO and STO corrections at the receiver have to be performed in frequency domain, because a received signal can be a superposition of transmissions coming from multiple UE multiplexed in frequency, each suffering from a specific residual synchronization error.…”

Section: Baseband Receivermentioning

confidence: 99%

Prototyping Software Transceiver for the 5G New Radio Physical Uplink Shared Channel

Cisek

Zieliński

2019

2019 Signal Processing Symposium (SPSympo)

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5G New Radio (NR) is an emerging radio access technology, which is planned to succeed 4G Long Term Evolution (LTE) as global standard of cellular communications in the upcoming years. This paper considers a digital signal processing model and a software implementation of a complete transceiver chain of the Physical Uplink Shared Channel (PUSCH) defined by the version 15 of the 3GPP standard, consisting of both baseband transmitter and receiver chains on a physical layer level. The BLER performance of the prototype system implementation under AWGN and Rayleigh fading channel conditions is evaluated. Moreover, the source code of high-level numerical model was made available online on a public repository by the authors. In the paper's tutorial part, the aspects of the 5G NR standard are reviewed and their impact on different functional building blocks of the system is discussed, including synchronization, channel estimation, equalization, soft-bit demodulation and LDPC encoding/decoding. A review of State-of-Art algorithms that can be utilized to increase the performance of the system is provided together with a guidelines for practical implementations.

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Synchronization Procedure in 5G NR Systems

Cited by 122 publications

References 10 publications

Indoor Coexistence Analysis Among 5G New Radio, LTE-A and NB-IoT in the 700 MHz Band

Indoor Coexistence Analysis Among 5G New Radio, LTE-A and NB-IoT in the 700 MHz Band

Three Decades of 3GPP Target Cell Search through 3G, 4G, and 5G

Prototyping Software Transceiver for the 5G New Radio Physical Uplink Shared Channel

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