Author Archives

• 5G Call Flow (eNB – gNB dual connectivity)

  By techlteworld on January 17, 2021 • ( 0 )

  

  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 Q & A (14/11/2020)

  By techlteworld on November 14, 2020 • ( 2 )

  

  1.    How many S1AP ID is created in initial attach procedure of LTE?   A.   One B.   Two C.   Three D.   Depends on resource availability     2.    Volte Supported UE at the time of emergency call will create.  … Read More ›

• LTE Q & A (13/11/2020)

  By techlteworld on November 13, 2020 • ( 0 )

  

  Until the UE is paged and bearers are setup which node is responsible to buffer the packets for the mean time in LTE? A. PGW B. PCRF C. SGW D. Visited PCRF Where is PCEF situated? OCS UDR PDN GW… Read More ›

• LTE Q & A (01/11/2020)

  By techlteworld on November 2, 2020 • ( 0 )

  

  1.Is it possible to trigger re-establishment procedure without RACH procedure? A.YES B.NO 2. In which channel we get the DCI Info A. PDSCH B. DLSCH C. PDCCH D. PBCH 3. For Paging in LTE which protocol is responsible A. Diameter… Read More ›

• What is CPRI & eCPRI ?

  By techlteworld on October 29, 2020 • ( 0 )

  

  While the CU/DU split adds a lot of extra flexibility in how services are deployed, there is still an area of cost that needs to be optimized is the RU. Today, the interface between the BBU and RU in 4G… Read More ›

• LTE Protocol Stack

  By techlteworld on October 27, 2020 • ( 0 )

  

  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)

  By techlteworld on October 21, 2020 • ( 5 )

  

  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 (20/10/2020)

  By techlteworld on October 20, 2020 • ( 0 )

  

  1. In 5G-NR Extended Cyclic Prefix (CP) is supported in which subcarrier spacing 15 kHz 60 kHz 120 kHz 240 kHz Ans. 60 kHz 2. In 5G-NR when we are using numerology-2 what would be the Slot length? 0.25 ms… Read More ›

• Functional split Option 7 & ORAN Alliance Specified Split option 7.2x

  By techlteworld on October 17, 2020 • ( 0 )

  

  In this option as shown in Fig below the lower physical layer functions and RF circuits are located in the DU(s). The upper protocol layers including the upper physical layer functions reside in the CU. There are multiple realizations of… Read More ›

• 5G-NR Q&A (15/10/2020)

  By techlteworld on October 15, 2020 • ( 0 )

  

  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 ›