Month: March 2019

LTE Overview

March 31, 2019

LTE (Long Term Evolution) or the E-UTRAN (Evolved Universal Terrestrial Access Network), introduced in 3GPP R8, is the access part of the Evolved Packet System (EPS). The main requirements for the new access network are high spectral efficiency, high peak data rates, short round trip time as well as flexibility in frequency and bandwidth. Figure […]

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PSS and SSS (LTE Synchronization)

March 31, 2019

 PSS and SSS (LTE Synchronization) After power-up, the UE  tries to obtain time and frequency synchronization with the system. For this, UE needs to detect signals to find out where the frame begins and ends. LTE define two type of synchronization signals: Primary synchronization signal (PSS) Secondary synchronization signal (SSS) UE uses the Synchronization Signals to: […]

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MASTER INFORMATION BLOCK (MIB)

March 31, 2019

MASTER INFORMATION BLOCK (MIB) is the broadcast information transmitted by eNodeB at periodically. After Decoding the PSS and SSS information UE have the information of Physical cell ID and not it can descramble the further information which Master information Block, which will provide the System bandwidth, Antenna configuration , System frame number. Bits and Bytes […]

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LTE Channels: Logical, Transport and Physical Channels Details and Mapping

March 31, 2019

What is a Channel in LTE? The information flows between the different protocols layers are known as channels. These are used to segregate the different types of data and allow them to be transported across different layers. These channels provide interfaces to each layers within the LTE protocol stack and enable an orderly and defined segregation […]

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Hybrid Automatic Repeat Request (HARQ) in LTE FDD

March 31, 2019

HARQ stands for Hybrid Automatic Repeat Request. HARQ = ARQ + FEC (Forward Error Correction)/Soft Combining. ARQ refers to Automatic Repeat Request i.e. if sender doesn’t receive Acknowledgement (ACK) before timeout, the receiver discards the bad packet and sender shall re-transmits the packet. ARQ procedure is illustrated below : Soft Combining is an error correction technique in which the bad packets […]

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LTE eNodeB Scheduler and Different Scheduler Type

March 31, 2019

What is a LTE Scheduler ? Scheduling is a process through which eNodeB decides which UEs should be given resources (RBs), how much resource (RBs) should be given to send or receive data .In LTE, scheduling is done at per subframe basis i.e. every 1 mili second. The entity which is govern this is know […]

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LTE EUTRAN Bands

March 31, 2019

LTE Bands and Available Bandwidth Band Uplink-fmin Uplink-fmax Downlink-fmin Downlink-fmax Available Bandwidth Duplex Mode Remark 1 1920 MHz 1980 MHz 2110 MHz  2170 MHz   60 MHz FDD 2 1850 MHz 1910 MHz 1910 MHz 1990 MHz   80 MHz FDD 3 1710 MHz 1785 MHz 1805 MHz 1880 MHz   75 MHz FDD 4 […]

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Feature Group Indicators (FGI bits) in LTE – Rel. 8, Rel. 9 and Rel. 10

March 31, 2019

Feature Group Indicators (FGI bits) Feature Group Indicator (FGI) is a special Information Element (IE) within UE Capability Information message. The parameters other than FGI in UE Capability Information message provides information about physical layer capability e.g. UE-Category, supported Bands, Carrier Aggregation band combination etc. Feature Group Indicator provides information about radio protocol aspects. FGI information is used […]

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Multi Carrier Cell Re-selection in LTE

March 31, 2019

Cell Re selection is a procedure used to change the cell after the UE is camped on a cell and stays in the Idle mode.This procedure is used to let the UE get camped on a cell which has the best radio conditions among all the other cells on which the UE is allowed to […]

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Maximum Coupling Loss (MCL) and Maximum Path Loss (MPL)

March 31, 2019

Maximum Coupling Loss has been chosen by 3GPP as the metric to evaluate coverage of a radio access technology. In theory, it can be defined as the maximum loss in the conducted power level that a system can tolerate and still be operational (defined by a minimum acceptable received power level). MCL can be calculated […]

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