Channel raster and synchronization signal raster for NR unlicensed spectrum
Systems and methods for determining channel raster(s) and synchronization signal raster(s) for New Radio (NR) unlicensed spectrum are disclosed herein. For each of a plurality of data objects an NR channel raster position is determined using Absolute Radio Frequency Channel Number (NR-ARFCN) numbers. For each corresponding NR channel, Global Synchronization Channel Numbers (GSCNs), a number of Physical Resource Blocks (PRBs) based on channel subcarrier spacing (SCS), NR channel raster position placement, channel edges, synchronization signal and physical broadcast channel (SSB) edges, and an SSB raster position are calculated. The plurality of data objects may then be down selected based on e.g., corresponding Long Term Evolution (LTE) channel raster positions and/or entries of a second plurality of data objects calculated for NR channels that use a second SCS.
1 . A non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium including instructions that when executed by a computer, cause the computer to:
down select from a plurality of data objects, each data object corresponding to a New Radio (NR) channel using a first subcarrier spacing (SCS) and comprising an NR channel raster position and a Synchronization Signal and Physical Broadcast Channel (SSB) raster position for each NR channel using the first SCS, wherein down selecting is performed by removing all but a remaining one of the plurality of data objects that comprises an NR channel raster position corresponding to the same Long Term Evolution (LTE) channel raster position; and
search for a valid SSB, based on the NR channel raster position and the SSB raster position, during an initial access procedure.
2 . The non-transitory computer-readable storage medium of claim 1 , wherein the remaining one of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position is selected to remain because it comprises an NRB that is equal to or greater than an NRB of each of the other of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position.
3 . The non-transitory computer-readable storage medium of claim 1 , wherein the instructions when executed by the computer, further cause the computer to remove, from the plurality of data objects, each data object that comprises an NR channel raster position that does not match an NR channel raster position of any data object of a second plurality of data objects, the second plurality of data objects each corresponding to an NR channel using a second SCS.
4 . The non-transitory computer-readable storage medium of claim 1 , wherein placements for the NR channel raster positions each comprise:
a physical resource block (PRB) number of a PRB of the NR channel corresponding to the data object comprising the NR channel raster position; and
a resource element index for a resource element corresponding to the NR channel raster position within the PRB.
5 . The non-transitory computer-readable storage medium of claim 4 , wherein the resource element index for the resource element corresponding to the NR channel raster position within the PRB is determinable based on whether the number of PRBs for the NR channel corresponding to the data object comprising the NR channel raster position is even or odd.
6 . The non-transitory computer-readable storage medium of claim 1 , wherein the NR channel raster position supports a number of physical resource blocks (PRBs) within a channel band.
7 . The non-transitory computer-readable storage medium of claim 6 , wherein the NR channel raster position supports 50 PRBs within a 20 MHz channel band.
8 . An apparatus of a computer, the apparatus comprising:
a memory to store a plurality of data objects; and
one or more processors configured to cause the computer to:
down select from the plurality of data objects, each data object corresponding to a New Radio (NR) channel using a first subcarrier spacing (SCS) and comprising an NR channel raster position and a Synchronization Signal and Physical Broadcast Channel (SSB) raster position for each NR channel using the first SCS, wherein down selecting is performed by removing all but a remaining one of the plurality of data objects that comprises an NR channel raster position corresponding to the same Long Term Evolution (LTE) channel raster position; and
search for a valid SSB, based on the NR channel raster position and the SSB raster position, during an initial access procedure.
9 . The apparatus of claim 8 , wherein the remaining one of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position is selected to remain because it comprises an NRB that is equal to or greater than an NRB of each of the other of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position.
10 . The apparatus of claim 8 , wherein the one or more processors are further configured to cause the computer to, further cause the computer to remove, from the plurality of data objects, each data object that comprises an NR channel raster position that does not match an NR channel raster position of any data object of a second plurality of data objects, the second plurality of data objects each corresponding to an NR channel using a second SCS.
11 . The apparatus of claim 8 , wherein placements for the NR channel raster positions each comprise:
a physical resource block (PRB) number of a PRB of the NR channel corresponding to the data object comprising the NR channel raster position; and
a resource element index for a resource element corresponding to the NR channel raster position within the PRB.
12 . The apparatus of claim 11 , wherein the resource element index for the resource element corresponding to the NR channel raster position within the PRB is determinable based on whether the number of PRBs for the NR channel corresponding to the data object comprising the NR channel raster position is even or odd.
13 . The apparatus of claim 8 , wherein the NR channel raster position supports a number of physical resource blocks (PRBs) within a channel band.
14 . The apparatus of claim 13 , wherein the NR channel raster position supports 50 PRBs within a 20 MHz channel band.
15 . A method of a computer, comprising:
down selecting from a plurality of data objects, each data object corresponding to a New Radio (NR) channel using a first subcarrier spacing (SCS) and comprising an NR channel raster position and a Synchronization Signal and Physical Broadcast Channel (SSB) raster position for each NR channel using the first SCS, wherein down selecting is performed by removing all but a remaining one of the plurality of data objects that comprises an NR channel raster position corresponding to the same Long Term Evolution (LTE) channel raster position; and
searching for a valid SSB, based on the NR channel raster position and the SSB raster position, during an initial access procedure.
16 . The method of claim 15 , wherein the remaining one of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position is selected to remain because it comprises an NRB that is equal to or greater than an NRB of each of the other of the plurality of data objects that comprise an NR channel raster position that corresponds to the same LTE channel raster position.
17 . The method of claim 15 , further comprising removing, from the plurality of data objects, each data object that comprises an NR channel raster position that does not match an NR channel raster position of any data object of a second plurality of data objects, the second plurality of data objects each corresponding to an NR channel using a second SCS.
18 . The method of claim 15 , wherein placements for the NR channel raster positions each comprise:
a physical resource block (PRB) number of a PRB of the NR channel corresponding to the data object comprising the NR channel raster position; and
a resource element index for a resource element corresponding to the NR channel raster position within the PRB.
19 . The method of claim 18 , wherein the resource element index for the resource element corresponding to the NR channel raster position within the PRB is determinable based on whether the number of PRBs for the NR channel corresponding to the data object comprising the NR channel raster position is even or odd.
20 . The method of claim 15 , wherein the NR channel raster position supports a number of physical resource blocks (PRBs) within a channel band.