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5G NR UE Initial Access Process

5G NR UE Initial Access Process

In this chapter we shall learn about 5G NR initial access process in brief. 1. UE sends RRC connection request message to gNB-DU. 2. gNB-DU will assign a C-RNTI to the UE and will include corresponding low level configuration for UE, will be included in F1AP …
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5G NR SRB configuration and NAS and RRC message mapping

5G NR SRB configuration and NAS and RRC message mapping

5G NR SRB configuration and NAS and RRC message mapping SRB are used to carry RRC and NAS messages. There are 4 different types of SRB in 5G NR. SRB0: It is used to transmit RRC messages on the logical channel CCCH. SRB1: It is used …
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5G NR: 5G QoS in detail

5G NR: 5G QoS in detail

QoS introduction 5G QoS model is based on QoS flow in 5G. 5G QoS supports both GBR QoS traffic and non-GBR QoS traffic. QoS flow is the finest granularity of QoS in a PDU session. QoS Flow ID (QFI) is used to identify QoS flow in …
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5G NR: 5G Radio Network Temporary Identifier

5G NR: 5G Radio Network Temporary Identifier

Radio Network Temporary Identifiers are applicable within the Radio Access Network (RAN). They are allocated by BS and will be used by both UE and BS. There are 3 different types of RNTI based on the addressing of UE: 1. C-RNTI: It is used to address …
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5G NR UE Identities and Network Identities

5G NR UE Identities and Network Identities

5G NR UE Identities: 1. C-RNTI: Unique UE identity used to identify UE for RRC Connection and for scheduling. 2. CI-RNTI: It is used of cancellation in the uplink. 3. CS-RNTI: Unique UE identification used for Semi-Persistent Scheduling in the downlink or configured grant in the …
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5G Identity Exchange between UE and Network

5G Identity Exchange between UE and Network

The above diagram shows the identity exchanged between UE and Network. 1. During initial registration UE will encrypt SUPI in SUCI and send it to gNB. 2. gNB will then forward it to AMF. 3. AMF will forward it to AUSF and UDM to get SUPI …
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5G Identities in detail Part 2

5G Identities in detail Part 2

In this chapter we shall learn about: 1. 5G GUTI – 5G Globally Temporary Identifier 2. 5G S TMSI – It is a shorter version of 5G GUTI. 5G S Temporary Mobile Subscriber Identity 5G GUTI: 5G GUTI is a Core Network Temporary identifier assigned by …
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5G NR Identities in detail Part 1

5G NR Identities in detail Part 1

UE in 5G network will have many identifiers to identify itself uniquely over the network. Below are some of them. In the next series of post, we shall discuss more on other identifiers. Brief of Identities present in 5G 1. SUPI –         …
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5G SA Core Network Procedure: AKA Authentication and Key Management Procedure

5G SA Core Network Procedure: AKA Authentication and Key Management Procedure

5G AKA procedure is required for UE to access the Network Services. UE needs to be authenticated before it is connected to the network. In 5G NR, IMSI has been replaced with SUCI (Subscription Permanent Identifier). In LTE there were few instances where IMSI was sent …
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5G NR Security overview and security key derivation

5G NR Security overview and security key derivation

Below image is taken from TS 38.300 Legend: USIM:  Universal Subscriber Identity Module ME:      Mobile Equipment SEAF:  SEcurity Anchor Function AUSF:  AUthentication Function ARPF:  Authentication credential Repository and Processing Function,it keeps the authentication credentials. k:          Key CK:       …
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