Physical Cell ID - LTE 4G vs 5GNR - Netmore Technology

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Physical Cell ID – LTE 4G vs 5GNR

04 Jul Physical Cell ID – LTE 4G vs 5GNR

Posted at 06:02h in Information Technology, Telecom Technology by admin 0 Comments

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Why is PCI required ?

PCI is used for Downlink Synchronization, which includes:

1. Frequency Synchronization
2. Timing Synchronization
3. Cell ID Detection

PCI includes two signals i.e., Primary Synchronization Signal and Secondary Synchronization Signal

After successful decode of SSS you will able to get PCI

PCI is calculated using the formula

PCI = (3 × SSS) + PSS

LTE 4G:

PSS has 3 values i.e., 0 to 2 and generated using Zad-off Chu sequence

SSS has 168 values i.e., 0 to 167 and generated using concatenation of 2 m-sequences

PCI = (3 * 167) + 2 = 503

So PCI values will vary from 0 to 503. LTE supports 504 unique PCIs

5GNR:

PSS has 3 values i.e., 0 to 2 and generated using m-sequence

SSS has 336 values i.e., 0 to 335 and generated using PN Gold sequence

In 5G-NR, the basic structure of PSS is the same but the number of SSS are increased

PCI = (3 * 335) + 2 = 1007

So PCI values will vary from 0 to 1007. 5GNR supports 1008 unique PCIs

Conclusion:

5GNR has double of the PCI’s compared to LTE 4G

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