Synchronization signal block raster shift in mobile communications
Various examples with respect to synchronization signal block (SSB) raster shift in mobile communications are described. A processor of a user equipment (UE) performs an initial cell search to identify a cell among one or more cells of a wireless communication system. The processor then camps on the identified cell. In performing the initial cell search, the processor scans through a plurality of SSB entries for frequency bands below 3 GHz with a SSB raster spacing and a SSB raster offset frequency that support sub-carrier spacing (SCS) spaced channel raster and 100 kHz channel raster for both 15 kHz SCS and 30 kHz SCS. A minimum channel bandwidth at 5 MHz or higher for 15 kHz SCS or at 10 MHz or higher for 30 kHz SCS is supported. The SSB raster spacing is a common multiple of 15 kHz and 100 kHz. The SSB raster offset frequency for 100 kHz channel raster is a multiple of 30 kHz plus/minus 10 kHz.
1. A method, comprising:
performing, by a processor of a user equipment (UE), an initial cell search to identify a cell among one or more cells of a wireless communication system; and
camping, by the processor, on the identified cell,
wherein the performing of the initial cell search comprises scanning through a plurality of synchronization signal block (SSB) entries with a SSB raster spacing being a common multiple of 15 kHz and 100 kHz, the plurality of SSB entries that are mathematically expressed as:
N *(1200 kHz)+ M *(50 kHz)
wherein a value of N ranges between 1 and 2499, and
wherein the value of M is one of 1, 3 and 5, with the value of M being 3 for SCS spaced channel raster.
2. The method of claim 1 , wherein a SSB raster spacing is 1200 kHz, and wherein a SSB raster offset frequency is 100 kHz.
3. The method of claim 1 , wherein the scanning through the plurality of SSB entries comprises scanning through the plurality of SSB entries for frequency bands below 3 GHz for either or both of the SCS spaced channel raster and the 100 kHz channel raster.
4. The method of claim 1 , wherein a SSB raster offset frequency for the 100 kHz channel raster is a multiple of 30 kHz plus or minus 10 kHz.
5. The method of claim 4 , wherein the SSB raster offset frequency is 20 kHz, 40 kHz, 50 kHz, 70 kHz, 80 kHz or 100 kHz.
6. The method of claim 4 , wherein a minimum of the SSB raster offset frequency is higher than two times of a highest frequency offset of by inaccuracy of a reference clock of the UE.
7. The method of claim 4 , wherein a maximum of the SSB raster offset frequency is lower than one third of a SSB raster spacing.
8. The method of claim 1 , wherein the SCS spaced channel raster comprises a SCS spaced channel raster with 15 kHz SCS.
9. The method of claim 8 , wherein a minimum channel bandwidth is 5 MHz or higher.
10. The method of claim 1 , wherein the SCS spaced channel raster comprises a SCS spaced channel raster with 30 kHz SCS.
11. The method of claim 10 , wherein a minimum channel bandwidth is 10 MHz or higher.
12. The method of claim 1 , wherein the SSB raster spacing is one of 300 kHz, 600 kHz, 900 kHz and 1200 kHz.
13. An apparatus, comprising:
a transceiver configured to wirelessly communicate with one or more cells of a wireless communication system; and
a processor coupled to the transceiver and configured to perform operations comprising:
performing, via the transceiver, an initial cell search to identify a cell among the one or more cells of the wireless communication system; and
camping, via the transceiver, on the identified cell,
wherein, in performing the initial cell search, the processor scans through a plurality of synchronization signal block (SSB) entries with a SSB raster spacing being a common multiple of 15 kHz and 100 kHz, the plurality of SSB entries are mathematically expressed as:
N *(1200 kHz)+ M *(50 kHz)
wherein a value of N ranges between 1 and 2499, and
wherein the value of M is one of 1, 3 and 5, with the value of M being 3 for SCS spaced channel raster.
14. The apparatus of claim 13 , wherein a SSB raster spacing is 1200 kHz, and wherein a SSB raster offset frequency is 100 kHz.
15. The apparatus of claim 13 , wherein a SSB raster offset frequency for the 100 kHz channel raster is a multiple of 30 kHz plus or minus 10 kHz, and wherein a maximum of the SSB raster offset frequency is lower than one third of a SSB raster spacing.
16. The apparatus of claim 13 , wherein the SCS spaced channel raster comprises a SCS spaced channel raster with 15 kHz SCS, and wherein a minimum channel bandwidth is 5 MHz or higher.
17. The apparatus of claim 13 , wherein the SSB raster spacing is one of 300 kHz, 600 kHz, 900 kHz and 1200 kHz.