Transmission mechanism with 120 kHz subcarrier spacing in FR1 for wireless communications
This document generally relates to wireless communication involving communication nodes that communicate in FR1 with a subcarrier spacing of 120 kHz. A network device may determine to communicate in a cell at a carrier frequency within frequency range 1 (FR1), and may transmit a set of synchronization signal and physical broadcast channel blocks (SSBs) in the carrier frequency within FR1 with a subcarrier spacing (SCS) of 60 kHz or 120 kHz. A user device searching for the cell at the carrier frequency within FR1 may detect the set of SSBs in the carrier frequency with the SCS of 60 kHz or 120 kHz.
1 . A method for wireless communication, the method comprising:
searching, by a user device, for a cell at a carrier frequency within frequency range 1 (FR1); and
detecting, by the user device, a set of synchronization signal and physical broadcast channel blocks (SSBs) in the carrier frequency with a subcarrier spacing (SCS) of 120 kHz,
wherein the SCS of the set of SSBs is 120 kHz, or is 120 kHz and combined with an extended cycle prefix (ECP),
wherein a number of the SSBs in a half frame is 64, and
wherein a first symbol index of each SSB in the half frame is {8, 12, 16, 20, 32, 36, 40, 44, 64, 68, 72, 76, 88, 92, 96, 100}+140*n, where n=0, 1, 2, and 3, or
when the SCS is combined with an extended cycle prefix, the first symbol index of each SSB in the half frame is:
{4, 8, 16, 20}+24*n, or
{2, 8, 14, 20}+24*n,
where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, and 18.
2 . The method of claim 1 , wherein the SCS of 120 kHz is supported for common data, and a reused current 1 bit in a master information block (MIB) indicates one of two candidate values for the SCS for the common data when the SCS of the set of SSBs is detected to be 120 kHz or 60 kHz, wherein the two candidate values comprise at least 120 kHz.
3 . The method of claim 1 , wherein the SCS of 120 kHz is supported for common data, and a reused current 1 bit and a reserved 1 bit in a master information block (MIB) indicate one of three or four candidate values, wherein the three or four candidate values comprise at least 120 kHz.
4 . The method of claim 1 , wherein the SCS of 120 kHz is supported for common data, and when a SSB with a 15 kHz SCS is detected:
a subcarrier offset from subcarrier 0 in a common resource block to a subcarrier 0 of a SSB comprises seven bits, wherein four of the seven bits are from a frequency offset value in a master information block (MIB) and three of the seven bits are from:
a last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 of a payload of a physical broadcast channel (PBCH) added by a physical layer of the network device; or
two of the last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 and a spare bit located in the payload that is added by a higher layer of the network device.
5 . The method of claim 1 , wherein the SCS of 120 kHz is supported for common data and when a SSB with a 30 kHz SCS is detected, or a SCS of 60 kHz is supported for the common data and when a SSB with a 15 kHz SCS is detected:
a subcarrier offset from subcarrier 0 in a common resource block to a subcarrier 0 of a SSB comprises six bits, wherein four of the six bits are from a frequency offset value in a master information block (MIB) and two of the six bits are from:
two of a last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 of a payload of a physical broadcast channel (PBCH) added by a physical layer of the network device; or
one of the last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 and a spare bit located in the payload that is added by a higher layer of the network device.
6 . A wireless communications apparatus comprising:
a memory storing a plurality of instructions; and
a processor configured execute the plurality of instructions, wherein upon execution of the plurality of instructions, the processor is configured to cause the apparatus to:
search for a cell at a carrier frequency within frequency range 1 (FR1); and
detect a set of synchronization signal and physical broadcast channel blocks (SSBs) in the carrier frequency with a subcarrier spacing (SCS) of 120 kHz,
wherein the SCS of the set of SSBs is 120 kHz, or is 120 kHz and combined with an extended cycle prefix (ECP),
wherein a number of the SSBs in a half frame is 64, and
wherein a first symbol index of each SSB in the half frame is {8, 12, 16, 20, 32, 36, 40, 44, 64, 68, 72, 76, 88, 92, 96, 100}+140*n, where n=0, 1, 2, and 3, or
when the SCS is combined with an extended cycle prefix, the first symbol index of each SSB in the half frame is:
{4, 8, 16, 20}+24*n, or
{2, 8, 14, 20}+24*n,
where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, and 18.
7 . The apparatus of claim 6 , wherein the SCS of 120 kHz is supported for common data, and a reused current 1 bit in a master information block (MIB) indicates one of two candidate values for the SCS for the common data when the SCS of the set of SSBs is detected to be 120 kHz or 60 kHz, wherein the two candidate values comprise at least 120 kHz.
8 . The apparatus of claim 6 , wherein the SCS of 120 kHz is supported for common data, and a reused current 1 bit and a reserved 1 bit in a master information block (MIB) indicate one of three or four candidate values, wherein the three or four candidate values comprise at least 120 kHz.
9 . The apparatus of claim 6 , wherein the SCS of 120 kHz is supported for common data, and when a SSB with a 15 kHz SCS is detected:
a subcarrier offset from subcarrier 0 in a common resource block to a subcarrier 0 of a SSB comprises seven bits, wherein four of the seven bits are from a frequency offset value in a master information block (MIB) and three of the seven bits are from:
a last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 of a payload of a physical broadcast channel (PBCH) added by a physical layer of the network device; or
two of the last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 and a spare bit located in the payload that is added by a higher layer of the network device.
10 . The apparatus of claim 6 , wherein the SCS of 120 kHz is supported for common data and when a SSB with a 30 kHz SCS is detected, or a SCS of 60 kHz is supported for the common data and when a SSB with a 15 kHz SCS is detected:
a subcarrier offset from subcarrier 0 in a common resource block to a subcarrier 0 of a SSB comprises six bits, wherein four of the six bits are from a frequency offset value in a master information block (MIB) and two of the six bits are from:
two of a last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 of a payload of a physical broadcast channel (PBCH) added by a physical layer of the network device; or
one of the last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 and a spare bit located in the payload that is added by a higher layer of the network device.
11 . A method for wireless communications, the method comprising:
determining, by a network device, to communicate in a cell at a carrier frequency within frequency range 1 (FR1); and
transmitting, by the network device, a set of synchronization signal and physical broadcast channel blocks (SSBs) in the carrier frequency within FR1 with a subcarrier spacing (SCS) of 120 kHz,
wherein the SCS of the set of SSBs is 120 kHz, or is 120 kHz and combined with an extended cycle prefix (ECP),
wherein a number of the SSBs in a half frame is 64, and
wherein a first symbol index of each SSB in the half frame is {8, 12, 16, 20, 32, 36, 40, 44, 64, 68, 72, 76, 88, 92, 96, 100}+140*n, where n=0, 1, 2, and 3, or
when the SCS is combined with an extended cycle prefix, the first symbol index of each SSB in the half frame is:
{4, 8, 16, 20}+24*n, or
{2, 8, 14, 20}+24*n,
where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, and 18.
12 . The method of claim 11 , wherein the SCS of 120 kHz is supported for common data, and a reused current 1 bit in a master information block (MIB) indicates one of two candidate values for the SCS for the common data when the SCS of the set of SSBs is detected to be 120 kHz or 60 kHz, wherein the two candidate values comprise at least 120 kHz.
13 . The method of claim 11 , wherein the SCS of 120 kHz is supported for common data, and a reused current 1 bit and a reserved 1 bit in a master information block (MIB) indicate one of three or four candidate values, wherein the three or four candidate values comprise at least 120 kHz.
14 . The method of claim 11 , wherein the SCS of 120 kHz is supported for common data, and when a SSB with a 15 kHz SCS is detected:
a subcarrier offset from subcarrier 0 in a common resource block to a subcarrier 0 of a SSB comprises seven bits, wherein four of the seven bits are from a frequency offset value in a master information block (MIB) and three of the seven bits are from:
a last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 of a payload of a physical broadcast channel (PBCH) added by a physical layer of the network device; or
two of the last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 and a spare bit located in the payload that is added by a higher layer of the network device.
15 . The method of claim 11 , wherein the SCS of 120 kHz is supported for common data and when a SSB with a 30 kHz SCS is detected, or a SCS of 60 kHz is supported for the common data and when a SSB with a 15 kHz SCS is detected:
a subcarrier offset from subcarrier 0 in a common resource block to a subcarrier 0 of a SSB comprises six bits, wherein four of the six bits are from a frequency offset value in a master information block (MIB) and two of the six bits are from:
two of a last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 of a payload of a physical broadcast channel (PBCH) added by a physical layer of the network device; or
one of the last three bits ā Ā+ 5 , ā Ā+ 6 , ā Ā+ 7 and a spare bit located in the payload that is added by a higher layer of the network device.