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LTE Network Fundamentals

  LTE Network Fundamentals: Essential Questions and Answers :- Q.1 What is possible range of PCI? ->0-503, PSS(0,1,2) and SSS(0-167) Q.2 What are the Physical Downlink Signals? ->Reference signal and synchronization signals - PSS and SSS Q.3 Difference between RSRP & RSRQ? ->RSRP – avg power across all received RS symbols in measurement bandwidth ->RSRQ-NxRSRP/RSSI ->N- no of RBs of eutra rssi measurement bandwidth Q.4 Repetition period of MIB? ->40ms Q.5 What is modulation scheme used for MIB? ->QPSK Q.6 Which channel carries user data in DL? (Basic) ->PDSCH Q.7 How many OFDM symbols are used for PDCCH? ->1, 2, or 3 as indicated by PCFICH Q.8 Which Physical DL channel carries the Paging channel? ->PDSCH Q.9 S1 Interface ->Enode B - MME - S1C and Enode B - SGW - S1U Q.10 Function of PHICH ->HARQ indication Q.11 Modulation scheme in PHICH? ->BPSK Q.12 What All BW supported in LTE? ->1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz Q.13 What is X2? -&
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Cell power failure ALARMS

 Cell power failure

Fault ID and name 4090:

EFaultId_TxCarrierInputPowerLowA

Used in products

FlexiBTS, LTE

Detecting unit

FSM

Source

LCR

Meaning

Flexi Radio Module has detected low downlink carrier input power from the Flexi System

Module.

State

Start

Unit status

Out of order

Unit status attributes

 

Effect

The cell is disabled

Reported alarms

7653 CELL FAULTY

LED display

None

Instructions

1. Check the other active alarms and act accordingly.

2. If that does not help, block/unblock the system module.

3. FSMr2: If that does not help, replace the system module.

FSMr3: If the faulty cell is on the baseband extension module, replace the extension module.

Related faults

 

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