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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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𝐌𝐢𝐜𝐫𝐨𝐰𝐚𝐯𝐞 𝐓𝐫𝐚𝐧𝐬𝐦𝐢𝐬𝐬𝐢𝐨𝐧 𝐋𝐢𝐧𝐤 𝐜𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐚𝐭𝐢𝐨𝐧

 𝐌𝐢𝐜𝐫𝐨𝐰𝐚𝐯𝐞 𝐓𝐫𝐚𝐧𝐬𝐦𝐢𝐬𝐬𝐢𝐨𝐧 𝐋𝐢𝐧𝐤 𝐜𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐚𝐭𝐢𝐨𝐧




- 1+0 is link without protection

- 1+1 is protected link ( main & standby )

- FD is a type of diversity protection where we use 2 frequencies to send the same signal stream

- SD is another type of diversity to use 2 dish antenna to receive the same signal stream

- Diversity used to avoid fading issues

- XPIC used to double the link capacity

- Xpic ia to send 2 traffic streams over the same frequency channel , same antenna at the same time with different polarization

- Xpic means orthognal polarization ( vertical & horizontal )

- HSB is one of the protection mechanisms for hardware where we send only over main link and if failed , we switch to the standby

- 2+0 can be xpic or Lag based on the link configuration

- MIMO 4*4 is to use double dual polarized antenna to send 4 service streams over same frequency channel simultaneously

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