SRS signaling in 5G new radio wireless communications
A base station is configured to determine a sounding reference signal (SRS) configuration that has a plurality of cyclic shifts for a comb 8 SRS, a plurality of user equipment (UE) ports for transmitting the comb 8 SRS and a mapping of the plurality of cyclic shifts to the plurality of UE ports. The base station is further configured to transmit the SRS configuration to the UE.
1 . A processor of a base station configured to perform operations comprising:
determining a resource block (RB)-level partial frequency sounding (RPFS) configuration, comprising:
a configured subband size;
an RPFS factor to be applied to the configured subband size;
a reduced subband size based on the configured subband size and the RPFS factor; and
a resulting sounding reference signal (SRS) sequence length based on 12/P f *K TC m SRS,B SRS where P f is the RPFS factor, K TC is a comb size, m SRS,B STS is the configured subband size and 12 is a number of resource elements in a physical resource block (PRB); and generating, for transmission, the RPFS configuration to a user equipment (UE).
2 . The processor of claim 1 , wherein the RPFS factor satisfies at least one predetermined criteria, wherein the predetermined criteria include (i) the reduced subband size is an integer, (ii) the reduced subband size is an integer multiple of four, (iii) the reduced subband size is a subband size supported by Release 16 3GPP standards, and (iv) the resulting SRS sequence length is 6, 12, 18, 24, or greater than or equal to 36.
3 . The processor of claim 1 , wherein, when the reduced subband size has a non-integer value, the operations further include:
rounding the non-integer value to a subband size supported by Release 16 3GPP standards, wherein rounding is one of a ceiling, floor, or nearest rounding.
4 . The processor of claim 1 , wherein, when the reduced subband size has a non-integer value, the operations further include:
rounding the non-integer value to an integer multiple of four, wherein rounding is one of a ceiling, floor, or nearest rounding.
5 . The processor of claim 1 , wherein, when the reduced subband size has a non-integer value, the operations further include:
rounding the non-integer value to a value for which the resulting SRS sequence length is 6, 12, 18, 24, or greater than or equal to 36.
6 . The processor of claim 1 , wherein when the resulting SRS sequence length is not 6, 12, 18, 24, or greater than or equal to 36, then the RPFS factor is not permitted.
7 . The processor of claim 1 , wherein when the resulting SRS sequence length is not 6, 12, 18, 24, or greater than or equal to 36, the operations further include:
rounding the resulting SRS sequence length to an SRS sequence length of one of 6, 12, 18, 24, or greater than or equal to 36, wherein the rounding is one of a ceiling, floor, or nearest rounding.
8 . A base station, comprising:
a transceiver configured to communicate with a user equipment (UE); and
a processor communicatively coupled to the transceiver and configured to perform operations comprising:
determining a resource block (RB)-level partial frequency sounding (RPFS) configuration, comprising:
a configured subband size;
an RPFS factor to be applied to the configured subband size;
a reduced subband size based on the configured subband size and the RPFS factor; and
a resulting sounding reference signal (SRS) sequence length based on 12/P f *K TC m SRS,B SRS where P f is the RPFS factor, K TC is a comb size, m SRS,B SRS is the configured subband size and 12 is a number of resource elements in a physical resource block (PRB); and
transmitting the RPFS configuration to the UE.
9 . The base station of claim 8 , wherein the RPFS factor satisfies at least one predetermined criteria, wherein the predetermined criteria include (i) the reduced subband size is an integer, (ii) the reduced subband size is an integer multiple of four, (iii) the reduced subband size is a subband size supported by Release 16 3GPP standards, and (iv) the resulting SRS sequence length is 6, 12, 18, 24, or greater than or equal to 36.
10 . The base station of claim 8 , wherein, when the reduced subband size has a non-integer value, the operations further include:
rounding the non-integer value to a subband size supported by Release 16 3GPP standards, wherein rounding is one of a ceiling, floor, or nearest rounding.
11 . The base station of claim 8 , wherein, when the reduced subband size has a non-integer value, the operations further include:
rounding the non-integer value to an integer multiple of four, wherein rounding is one of a ceiling, floor, or nearest rounding.
12 . The base station of claim 8 , wherein, when the reduced subband size has a non-integer value, the operations further include:
rounding the non-integer value to a value for which the resulting SRS sequence length is 6, 12, 18, 24, or greater than or equal to 36.
13 . The base station of claim 8 , wherein when the resulting SRS sequence length is not 6, 12, 18, 24, or greater than or equal to 36, then the RPFS factor is not permitted.
14 . The base station of claim 8 , wherein when the resulting SRS sequence length is not 6, 12, 18, 24, or greater than or equal to 36, the operations further include:
rounding the resulting SRS sequence length to an SRS sequence length of one of 6, 12, 18, 24, or greater than or equal to 36, wherein the rounding is one of a ceiling, floor, or nearest rounding.