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Category: 5G NR

5G NAS – PDU Session Reject Cause Values and Reasons

5G connectivity service is named as PDU Session. A PDU session is very similar to an EPS bearer in LTE, except for the QoS model and the supported user data.  […]

June 27, 2021June 27, 2021 Author 5G, 5G Call Flow, 5G NR, NAS Signalling, Tech Fundas

5G NAS – Registration Request

5G NAS Registration Request is a 5GMM Procedure Initaiated by a UE. The network can resond as Registartion Accept in successful case or Registration Reject with specified cause value in […]

June 5, 2021August 5, 2021 Author 5G, 5G Call Flow, 5G NR

5G NR Downlink HARQ Codebook

In 5G NR, 3GPP specification has defined HARQ Codebook  to provide the feedback to base station for Downlink data transmission i.e., PDSCH Data. UE Sends the ACK/NACK for corresponding PDSCH […]

May 24, 2021October 4, 2021 Author 3GPP Specification, 5G, 5G NR, 5G Physical Layer

NGAP – NG Application Protocol over N2 Interface

In the 5G SA, NG interface is designed to interconnect gNB and 5G Core which is similar to S1 interface in 4G LTE connects eNB and EPC. Considering Control and […]

May 18, 2021May 18, 2021 Author 3GPP Specification, 5G Call Flow, 5G Core, 5G NR, Tech Fundas

5G SA Handover – Inter gNB-DU and Intra gNB-CU Handover

Mobility (Handover) in an important feature in any telecom generation and so it is in 5G. The basic handover procedure remains same as it was in legacy networks, i.e. UE […]

May 11, 2021October 2, 2021 Author 5G Call Flow, 5G Network Architectures, 5G NR, 5G NR Standalone, Call Flow, New Radio, Open RAN, RRC Signalling, Tech Fundas, Wireless Testing

5G NR Cell Global Identity (NCGI) Planning and Calculations

In 5G, NR Cell Global Identifier (NCGI) is used to identify NR cells globally and similar to ECGI (EUTRA Cell Global Identifier ) in 4G LTE. The NCGI is constructed […]

March 28, 2021March 28, 2021 Author 5G, 5G Network Planning, 5G NR, 5G NR Standalone, NR, Tech Fundas, Wireless Testing

5G Authentication and Key Management 5G-AKA

Secure communication in any cellular network can be achieved with help of AKA procedure.  AKA is Authentication and Key Management procedure which involve mutual authentication between User Device and the […]

March 26, 2021July 6, 2021 Author 5G Core, 5G NR, NAS Signalling, Security, Signaling, Tech Fundas, Wireless Testing

5G NR NSA Mode: UE Network and Radio Capability Enquiry

In any wireless system, for accurate, efficient coordination and intercommunication base station must know the all capability about the UE.  The base station enquires the UE Capability and UE report […]

February 22, 2021February 22, 2021 Author 5G, 5G NR, RRC Signalling

5G NR SSB Positioning – Time and Frequency Resources

In 5G NR, Synchronization Signal Block (SSB) includes PSS, SSS and PBCH and its location compared to LTE is completed different. In LTE, Sync signal position is  straight forward located […]

January 31, 2021January 31, 2021 Author 5G, 5G Network Architectures, 5G NR, 5G Physical Layer, Interviews, Tech Fundas

5G NR-PDCCH Channel Overview and Processing

The physical downlink control channel (PDCCH) in NR carries Downlink Control Information (DCI). In this post we will understand how PDCCH operates by describing its physical layer structure, and the […]

January 26, 2021January 26, 2021 Author 5G, 5G NR, Call Flow, IoT, RRC Signalling, Wireless Testing

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