3 GPP TSGRAN WG 4 Meeting 86 bis

3 GPP TSG-RAN WG 4 Meeting #86 bis Melbourne, AU, 16 -22 April, 2018 R 4 -180 xxxx Observations on Sync Raster with “small shift” Intel,

Basic design criteria for sync raster • At least one SSB should be fully contained within the minimum channel BW (i. e. 4. 5 MHz@15 k. Hz SCS or 8. 64 MHz@30 k. Hz SCS) with aligned RE boundary • To meet this criterion, • When SCS=15 k. Hz, for each channel raster point, there is at least one sync raster point, of which the corresponding distance to the channel raster point is no more than 450 k. Hz and is divisible by 15 k. Hz • When SCS=30 k. Hz, for each channel raster point, there is at least one sync raster point, of which the corresponding distance to the channel raster point is no more than 720 k. Hz and is divisible by 30 k. Hz

Illustration of basic design criteria for sync raster

Issue with existing “short shift” designs • Alternative 1: N*900 k. Hz+M*5 k. Hz ; Alternative 2: N*700 k. Hz+M*5 k. Hz • Without loss of generality, channel raster point 1000 k. Hz, 900 k. Hz are considered to check if the basic design criteria can be fulfilled • In the following table, all sync raster points within 450 k. Hz and 720 k. Hz from the channel raster points for 15 k. Hz and 30 k. Hz SCS respectively are included • Sync raster points are highlighted in red if the corresponding distance is divisible by SCS • No sync raster points satisfy the basic criteria in the boxes highlighted in orange. • Observation: for existing alternatives with “short shift”, none of them can meet the basic design criteria. Alternative 1 Alternative 2 Channel raster SCS=15 k. Hz point=1000 k. Hz SCS=30 k. Hz 895 k. Hz, 900 k. Hz, 905 k. Hz 695 k. Hz, 700 k. Hz, 705 k. Hz, 1395 k. Hz, 1400 k. Hz, 1405 k. Hz Channel raster point=900 k. Hz SCS=15 k. Hz 895 k. Hz, 900 k. Hz, 905 k. Hz 695 k. Hz, 700 k. Hz, 705 k. Hz, 1395 k. Hz, 1400 k. Hz, 1405 k. Hz SCS=30 k. Hz 895 k. Hz, 900 k. Hz, 905 k. Hz 695 k. Hz, 700 k. Hz, 705 k. Hz, 1395 k. Hz, 1400 k. Hz, 1405 k. Hz