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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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Physical Cell Identity conflicts in 5G

 πŸ“Œ Physical Cell Identity conflicts in 5G.



 πŸ“Physical Cell Identity (PCI)
 In 5G, each cell is assigned a unique Physical Cell Identity (PCI) identifier.
The PCI is used by mobile devices to differentiate between different cells in the network. It's essential for tasks like cell selection, handover, and measurement reporting.
In 5G NR, the PCI range is from 0 to 1007, providing a total of 1008 unique PCIs.
πŸ“ PCI Conflicts
 A PCI conflict occurs when two or more nearby cells are assigned the same PCI.
This can cause confusion for the mobile device as it can't differentiate between the cells based on the PCI. This can lead to issues with handovers, measurements, and overall network performance.
For example, if two cells with the same PCI are in close proximity, a mobile device might continually try to switch (handover) between them, leading to a poor user experience.
πŸ“ Avoiding and Resolving PCI Conflicts
 Proper PCI planning is crucial to avoid PCI conflicts. This involves assigning unique PCIs to all cells in such a way that no two nearby cells have the same PCI.
Some network planning tools use algorithms to automatically assign PCIs to cells in a way that minimizes the likelihood of PCI conflicts.

PCI conflict detection is also an important part of network optimization. This involves monitoring the network and identifying any cells with conflicting PCIs.
Once a PCI conflict is detected, it can be resolved by re-assigning a new, unique PCI to one of the conflicting cells.

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