techlteworld

5G Call Flow (eNB – gNB dual connectivity)

ENDC -Dual Connectivity (EN-DC) which enables 5G services and 4G network. UEs supporting EN-DC can connect simultaneously to LTE Master Node eNB and 5G-NR Secondary Node gNB. UE first register with 4G EPC through ENDC. Based on UE supportability it… Read More ›

LTE Protocol Stack

LTE Protocol stack is divided into Three Layers. Layer 1 (Physical Layer) Layer 2 (PDCP,MAC,RLC Layers) Layer 3 (NAS and RRC Layers) Functions of each Layer. NAS: 3GPP TS 24.301 EPS bearer management Authentication Paging origination EPC connection management-IDLE mobility… Read More ›

LTE Q & A (21/10/2020)

1.Components of TAI TAC,MNC TAC,MCC MNC,TAC,MCC TAC,MNC Ans. MNC,TAC,MCC 2. ERAB Consist of S1 and S5/S8 Bearer Radio and S5/S8 Bearer Radio and S1 Bearer S1, Radio and S5/S8 Bearer Ans. Radio and S1 Bearer 3. Default bearer uses Non-GBR… Read More ›

5G-NR Q&A (15/10/2020)

1.In 5G, UE in RRC IDLE cannot move to RRC INACTIVE FALSE TRUE Ans. TRUE 2. 5G-S-TMSI is allocated by SMF AMF UPF AUSF Ans. AMF 3. What does CSI consist of in 5G-NR CQI,RI,PMI LI,CRI SSBRI,CQI,RI,PMI,LI,CRI CQI,LI,RI,PMI Ans. SSBRI,CQI,RI,PMI,LI,CRI… Read More ›