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 ›
Telecom
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 ›
Function Splits in ORAN/5G-NR:
Function Splits in ORAN/5G NR: Centralized baseband processing was introduced several years ago to ease installation of base stations in large buildings. Digital radio interfaces and remote radio heads (RRHs) both was enabled by it, which allowed the connection between… Read More ›
5G-NR RACH (Random Access Procedure)
5G-NR RACH (Random Access Procedure) Random Access Procedure RA Procedure is of two different types. Contention based RA Procedure Contention Free RA Procedure Contention based RA Procedure In CBRA, the UE randomly selects an RA preamble from a pool of… Read More ›
LTE Handover Concept
Types of Handover in LTE Categorization of Handover (EPC Entities are Changed or not) in three kinds Intra-LTE Handover Inter-LTE Handover Inter-RAT Categorization of Handover (EPC Entities are Involved or not) in two types X2 Handover S1 Handover Basic Concept… Read More ›
5G-NR Radio Network Temporary Identifier (RNTI)
UE and Network Identifiers NR UE uses temporary identifiers to communicate gNB. RNTI is 16-bit identifier and its value depends on type of RNTI. Many RNTI of LTE and NR are same. Below are the identifiers as per 38.321 for… Read More ›
LTE Synchronization Signals (PSS and SSS)
Initial Acquisition In frequency Acquisition we will get Band Information (Supported Band Info) EARFCN Information (Defined EARFCN) PLMN Information Need to know PLMN and EARFCN information will be provided by SIM. Band Information will be provided by Phone (system file)…. Read More ›
LTE CSFB (Circuit Switch Fall Back)
CSFB To make a voice call there are mainly two solutions: CSFB IMS based Volte Call There are pre conditions for CSFB: When UE is in LTE RAT it should be registered with MSC . UE is not directly connected… Read More ›
5G-NR Frame structure
Numerology – Subcarrier Spacing As we know in LTE we have only one type of subcarrier spacing i.e. 15Khz. NR support multiple type of subcarrier spacing. NR supports a flexible OFDM numerology with subcarrier spacings ranges from 15 kHz to… Read More ›
ORAN -Why,What,When?
Now question here comes in mind Why,What , When ORAN. Why ORAN: Most of the CAPEX required to build a wireless network is related to the RAN segment, reaching as high as 80% of the total network cost. Any reduction… Read More ›