Synchronization signal block design for narrowband operation
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a transmission bandwidth that is narrower than a channel bandwidth. The UE may decode the SSB based at least in part on the SSB configuration. Numerous other aspects are described.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network node, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a transmission bandwidth that is narrower than a channel bandwidth, wherein the SSB includes:
a punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth wherein the ARFCN value associated with the SSB corresponds to a global synchronization channel number (GSCN) value that differs from a GSCN value associated with an SSB that includes a non-punctured PBCH; and
decoding the SSB based at least in part on the SSB configuration.
2 . The method of claim 1 , wherein the synchronization raster is based at least in part on a location of the PSS and the SSS within the SSB.
3 . The method of claim 1 , wherein the punctured PBCH is punctured at a first end to be aligned with a resource block (RB) at a first end of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).
4 . The method of claim 3 , wherein the punctured PBCH is punctured at a second end of the PSS and the SSS to fit within the transmission bandwidth.
5 . The method of claim 1 , wherein the SSB includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), the PSS and the SSS associated with a first center frequency that is maximally separated from a second center frequency of a PSS and an SSS associated with an SSB in an operating band having a wider or narrower transmission bandwidth than the operating band associated with the received SSB.
6 . The method of claim 1 , wherein the SSB includes:
a non-punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth, different from an ARFCN value associated with a different channel bandwidth.
7 . The method of claim 1 , wherein the SSB includes a punctured physical broadcast channel (PBCH) within a first transmission bandwidth associated with the SSB and with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth, different from an ARFCN value associated with the punctured PBCH within a second transmission bandwidth associated with the SSB in a same size of the channel bandwidth.
8 . The method of claim 1 , wherein decoding the SSB includes determining a number of resource blocks (RBs) included in the SSB based at least in part on a synchronization raster associated with a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) detected in the SSB.
9 . The method of claim 1 , wherein the transmission bandwidth is indicated in a master information block (MIB) associated with a physical broadcast channel (PBCH) carried in the SSB.
10 . The method of claim 1 , further comprising:
receiving an SSB from a neighbor cell; and
obtaining one or more radio resource management (RRM) measurements associated with the SSB received from the neighbor cell based at least in part on an indication of a configuration associated with the SSB received from the neighbor cell.
11 . The method of claim 10 , wherein the configuration associated with the SSB received from the neighbor cell includes a transmission bandwidth that equals the transmission bandwidth associated with the SSB received from the network node based at least in part on the neighbor cell and the network node sharing a synchronization raster associated with a frequency band.
12 . The method of claim 10 , wherein the configuration associated with the SSB received from the neighbor cell is based at least in part on an absolute radio frequency channel number (ARFCN) value indicated for the neighbor cell.
13 . The method of claim 10 , wherein the configuration associated with the SSB received from the neighbor cell is indicated in a system information block or a measurement configuration associated with the neighbor cell.
14 . A method of wireless communication performed by a network node, comprising:
generating a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a transmission bandwidth that is narrower than a channel bandwidth; wherein the SSB includes:
a punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth and wherein the ARFCN value associated with the SSB corresponds to a global synchronization channel number (GSCN) value that differs from a GSCN value associated with an SSB that includes a non-punctured PBCH; and
transmitting the SSB associated with the SSB configuration.
15 . The method of claim 14 , wherein the synchronization raster is based at least in part on a location of the PSS and the SSS within the SSB.
16 . The method of claim 14 , wherein the punctured PBCH is punctured at a first end to be aligned with a resource block (RB) at a first end of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).
17 . The method of claim 16 , wherein the punctured PBCH is punctured at a second end of the PSS and the SSS to fit within the transmission bandwidth.
18 . The method of claim 14 , wherein the SSB includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), the PSS and the SSS associated with a first center frequency that is maximally separated from a second center frequency of a PSS and an SSS associated with an SSB in an operating band having a wider or narrower transmission bandwidth than the operating band associated with the transmitted SSB.
19 . The method of claim 14 , wherein the SSB includes:
a non-punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth, different from an ARFCN value associated with a different channel bandwidth.
20 . The method of claim 14 , wherein the SSB includes a punctured physical broadcast channel (PBCH) within a first transmission bandwidth associated with the SSB and with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth, different from an ARFCN value associated with the punctured PBCH within a second transmission bandwidth associated with the SSB in a same size of the channel bandwidth.
21 . The method of claim 14 , wherein the transmission bandwidth is indicated in a master information block (MIB) associated with a physical broadcast channel (PBCH) carried in the SSB.
22 . A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive, from a network node, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a transmission bandwidth that is narrower than a channel bandwidth; wherein the SSB includes:
a non-punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth, different from an ARFCN value associated with a different channel bandwidth; and
decode the SSB based at least in part on the SSB configuration.
23 . The UE of claim 22 , wherein the SSB includes:
a punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth.
24 . The UE of claim 22 , wherein the SSB includes a punctured physical broadcast channel (PBCH) within a first transmission bandwidth associated with the SSB and with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth, different from an ARFCN value associated with the punctured PBCH within a second transmission bandwidth associated with the SSB in a same size of the channel bandwidth.
25 . A network node for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
generate a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a transmission bandwidth that is narrower than a channel bandwidth; wherein the SSB includes:
a punctured physical broadcast channel (PBCH), and
a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) associated with a synchronization raster that is indicated by an absolute radio frequency channel number (ARFCN) value associated with the channel bandwidth and wherein the ARFCN value associated with the SSB corresponds to a global synchronization channel number (GSCN) value that differs from a GSCN value associated with an SSB that includes a non-punctured PBCH; and
transmit the SSB associated with the SSB configuration.