Part#6| SSB in Non-Standalone Mode | SSB in NSA | 

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Part#6| SSB in Non-Standalone Mode | SSB in NSA |
In 5G NR, Synchronization Signal Block (SSB) includes PSS, SSS and PBCH and its location compared to LTE is completed different. In LTE, Sync signal position is straight forward located around DC carrier (Center 6 PRBS/72 subcarriers) but in 5G Sync signals are positioned on the Bandwidth part is not fixed and can be located any where across the Carrier Bandwidth.
Here we can taken an example for 5G NR band n78 (TD3500) with FR1 and tried to put together how Time Domain & Frequency Domain resources are allocated for SSB and how positioning of SSB on CBW is determined.
SSB Time Domain Resource:
• SS block consists of 4 consecutive OFDM symbols
• The 1st symbol Position is determined by combination of Carrier Bandwidth (CBW) + Sub-carrier spacing (SCS)
• 3GPP specification TS 38.213 provided below table to determines the position of starting OFDM Symbol of each SCS in a CBW.
SSB Frequency Domain Resources
• SSB in frequency domain consist of 240 consecutive Subcarriers numbered in increasing order from 0 to 239 is equal to 20 PRBs
• If ssb-SubcarrierOffset is not provided, SSB is derived from the frequency difference between the SS/PBCH block and Point A.
• In NSA mode operation the location of the SSB is determined by information provided by higher layer in RRC Reconfiguration message, IE’s are highlighted in below snap
• absoluteFrequencyPointA: It represents the common reference point A, this reference point is the 0th RB of 273 RBs, which is the center point of RB#0. From above logs absoluteFrequencyPointA= 642722 (NREF)
o absoluteFrequencyPointA= 3000 MHz + 15* (642722 -600000) KHz= 3,640.83 MHz
• absoluteFrequencySSB: It represent the center frequency of SSB Block. A SSB block is 20 RBs results 20 * 12 =240 Subcarriers and from above logs snippet absoluteFrequencySSB= 643008 (NREF)
o absoluteFrequencySSB= 3000 MHz + 15* (643008 -600000) KHz= 3,645.12 MHz
• Carrier Center Frequency: The total number of RB’s=51 and Resource Block corresponding to center frequency is 51/2=26
o Center Frequency= absoluteFrequencyPointA + 26 RBs * 12 * Subcarrier Spacing
o Center Frequency= 3,640.83 + 26 * 12 *30 KHz = 3,650.19 MHz
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