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Articles

Articles

 

Cafetele telecom training  team is here to update you with important topics. if you have any question about other topics, please send us your massage. We will be happy to hear from you.

 

5G-NR
5G

5G Registration Management

A UE/user needs to register with the network to receive services that requires registration. 5GS Registration Management states Two RM states are used in the UE and the AMF that reflect the registration status of the UE in the selected PLMN. RM-DEREGISTERED. RM-REGISTERED RM-DEREGISTERED state In the RM‑DEREGISTERED state, the

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5G NR
5G

5G-NR Network Function

The 5G System architecture consists of the following network functions (NF). Service-based interfaces: This Service based interface is connected to each interface. The 5G System Architecture contains the following service-based interfaces: SBI Interface   Namf    Service-based interface exhibited by AMF Nsmf    Service-based interface exhibited by SMF Nnef    Service-based interface exhibited

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4G

System Information Block LTE

System Information Blocks in LTE, SIBs carry relevant information for the UE, which helps UE to access a cell, perform cell re-selection, information related to INTRA-frequency, INTER-frequency, and INTER-RAT cell selections.In LTE there are 13 types of SIBs. Each SIB has its own job to do, which means, they are

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5G

MIB : Master Information Block

Master Information Block Direction: gnB=> UE Signalling Radio Bearer: N/A RLC-SAP: TM Logical Channel: BCCH Transport Channel: BCH The MASTER INFORMATION BLOCK (MIB) includes a limited number of most essential and most frequently transmitted parameters that are needed to acquire other information from the cell. The MIB is transmitted on BCH while all other SYSTEM INFORMATION messages are transmitted on DL-SCH The MIB is

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SCG/MCG failure handling
5G

SCG/MCG failure handling

RLF is declared separately for the MCG and for the SCG If radio link failure is detected for MCG, the UE initiates the RRC connection re-establishment procedure The following SCG failure cases are supported: – SCG RLF; – SN change failure; – For EN-DC, NGEN-DC and NR-DC, SCG configuration failure

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BWP - 5G training
5G

BandWidth Part (BWP)

According to 3GPP specification, UE channel bandwidth is up to 100MHz for sub-6GHz bands and 400MHz for above 6GHz bands, which is much wider than the bandwidth of 20MHz in LTE. It should be noted that UE capability of supported bandwidth varies and is often limited to the bandwidth less

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5G training
5G

PTRS – Reference signal

Phase Tracking Reference Signal (PTRS) PT-RS use is mainly to estimate and minimize the effect of CPE on system performance. Due to the phase noise properties, PT-RS signal has a low density in the frequency domain and a high density in the time domain. PT-RS always occurs in combination with

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5G courses
5G

Downlink control information

DCI transports downlink control information for one or more cells with one RNTI. The following coding steps, can be identified: Information element multiplexing CRC attachment Channel coding Rate matching Category DCI Format Description DCI formats for scheduling of PUSCH Format 0_0 Fallback DCI. DCI format 0_0 is used for the

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5G courses
5G

What is V2X?

V2X is a vehicular technology system that enables vehicles to communicate with the traffic and the environment around them, using short-range wireless signals. Intelligent transportation systems (ITSs) refer to services to improve traffic safety and increase efficiency. There are two types of V2X communication technology depending on the underlying technology being

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5G courses
5G

DFT-s-OFDM Signal Model

In the current NR specifications [2], [3], Discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-s-OFDM) [14] is used for the uplink transmission, especially in coverage limited scenarios. This waveform is also referred to as single-carrier FDM waveform (SCFDM) in the literature. In 3GPP 5G NR, QAM modulation symbols with modulation order

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5G courses
5G

Overview of L1 functions( Physical Layer)

The physical layer is expected to perform the following functions to provide the data transport service Error detection on the transport channel and indication to higher layers; FEC encoding/decoding of the transport channel; Hybrid ARQ soft-combining; Rate matching of the coded transport channel to physical channels; Mapping of the coded

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5G courses
5G

Signaling radio bearers

Signaling Radio Bearers (SRBs) are defined as Radio Bearers (RBs) that are used only for the transmission of RRC and NAS messages. More specifically, the following SRBs are defined: SRB0 is for RRC messages using the CCCH logical channel. SRB1 is for RRC messages (which may include a piggybacked NAS

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