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 by NEF Npcf Service-based interface…
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 always transmitted on the BCH…
SCG Failure 5G NR 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 (only for messages on…
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 than the maximum bandwidth supported…
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 DM-RS and only when the…
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 scheduling of PUSCH in one…
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 used: WLAN-based cellular-based IEEE first…
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 (4, 16, 64, 256) can…
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 transport channel onto physical channels;…
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 message) as well as for…