CELL ID logic.md

4G CELL ID logic

ECI = eNodeBID * $$2^{28-22}$$ + CellID

5G CELL ID logic

• NCI（NR Cell Identity） ：gNB ID + CI

  • Length: 36bit
  • Range: 0 to 68719476735

• gNB ID

  • Maximum length 32bit, range: $0 \sim 2^{32-1}$ (4294967295)
  • Minimum length 22 bits, range: $0 \sim 2^{22-1}$ (4194303)

• CI：cell ID

  • Maximum length 14 bits, range: $0 \sim 2^{14-1}$ (16383)
  • Minimum length of 4 digits, range: $0 \sim 2^{4-1}$ (15)

• NCI calculation

NCI = gNB_ID * $2^{36-gNB_ID_length}$ + CI

Example 1:

• gNB_ID
  • When the length is 24 bits, the CI length is 12 bits, NCI=gNBID * $2^{12}$+CI= gNBID * 4096+CI.

Example 2:

• gNB_ID length = 23

NCI = gNodeBID * $$2^{36-23}$$ + CellID

NCI = gNodeBID * $8192$ + CellID

All tech rationalities