Demodulation reference signal for physical broadcast channel in new radio
A reference signal sequence to modulate the demodulation reference signal for the Physical Broadcast Channel in New Radio standard is disclosed. Formulas are proposed for calculating the initialization value for the RS sequence generator so as to accord with the characteristics of New Radio.
1. An apparatus of a user equipment (UE) comprising a baseband processor configured to:
generate a demodulation reference signal (DMRS) sequence from a Gold code based on an initialization value, wherein the initialization value is determined based on
a cell identification (ID) parameter, upon which
a modulus operation is performed by the baseband processor; and
separately, a mathematical floor operation is performed by the baseband processor; and
at least a portion of a synchronization signal (SS) block index;
receive a physical broadcast channel (PBCH) DMRS; and
process the PBCH DMRS based on the DMRS sequence.
2. The apparatus of claim 1 , wherein the modulus operation further comprises N ID cell mod 4, wherein N ID cell is the cell ID parameter.
3. The apparatus of claim 1 , wherein the mathematical floor operation further comprises └N ID cell /4┘.
4. The apparatus of claim 1 , wherein the baseband processor is configured to calculate the initialization value by
performing a N ID cell mod 4 operation to generate a first cell ID part, wherein N ID cell is based on the cell ID;
performing a mathematical floor operation └N ID cell /4┘ to generate a second cell ID part; and
combining the second cell ID part in a nonlinear way with the at least a portion of SS block index; and
combining the first cell ID part in a linear way with the nonlinear combination of the second cell ID part and the at least portion of the SS block index.
5. The apparatus of claim 1 , wherein the baseband processor is configured to calculate the initialization value based on the three least significant bits of the SS block index.
6. The apparatus of claim 1 , wherein the baseband processor is configured to calculate the initialization value based on a multiplication of the cell ID and the at least a portion of SS block index parameter.
7. The apparatus of claim 1 , wherein the initialization value results from a non-linear combination of a cell ID parameter and the at least a portion of the SS block index, wherein the cell ID parameter comprises N bits for integer N of the cell ID.
8. The apparatus of claim 1 , wherein the baseband processor is configured to generate the DMRS from a UE specific reference sequence r(m) as:
r
(
m
)
=
1
2
(
1
-
2
·
c
(
2
m
)
)
+
j
1
2
(
1
-
2
·
(
2
m
+
1
)
where m=0, 1, . . . ,6N RB PBCH −1 and N RB PBCM =24 and c is the initialization value.
9. A method for a user equipment (UE) comprising:
determining an initialization value based on
a cell identification (ID) parameter, upon which
a modulus operation is performed; and
separately, a mathematical floor operation is performed; and
at least a portion of a synchronization signal (SS) block index;
generating a demodulation reference signal (DMRS) sequence from a Gold code based on the initialization value;
receiving a physical broadcast channel (PBCH) DMRS from a base station; and
processing the PBCH DMRS based on the DMRS sequence.
10. The method of claim 9 , wherein the modulus operation further comprises N ID cell mod 4, wherein N ID cell is the cell ID parameter.
11. The method of claim 9 , wherein the mathematical floor operation further comprises └N ID cell /4┘.
12. The method of claim 9 , comprising calculating the initialization value by performing a N ID cell mod 4 operation to generate a first cell ID part, wherein N ID cell is based on the cell ID;
performing a mathematical floor operation └N ID cell / 4┘ to generate a second cell ID part; and
combining the second cell ID part in a nonlinear way with the at least a portion of SS block index; and
combining the first cell ID part in a linear way with the nonlinear combination of the second cell ID part and the at least portion of the SS block index.
13. The method of claim 9 , comprising calculate the initialization value based on the three least significant bits of the SS block index.
14. The method of claim 9 , comprising calculating the initialization value based on a multiplication of the cell ID and the at least a portion of SS block index parameter.
15. The method of claim 9 , wherein the initialization value results from a non-linear combination of a cell ID parameter and the at least a portion of the SS block index, wherein the cell ID parameter comprises N bits for integer N of the cell ID.
16. The method of claim 11 , comprising generating the DMRS from a UE specific reference sequence r(m) as:
r
(
m
)
=
1
2
(
1
-
2
·
c
(
2
m
)
)
+
j
1
2
(
1
-
2
·
(
2
m
+
1
)
where m=0, 1, . . . , 6N RB PBCH −1 and N RB PBCH =24 and c is the initialization value.
17. An apparatus of a 5G enhanced Node B (gNB) comprising a baseband processor configured to:
determine an initialization value based on:
a cell identification (ID) parameter, upon which
a modulus operation is performed by the baseband processor; and
separately, a mathematicalfloor operation is performed by the baseband processor; and
at least a portion of a synchronization signal (SS) block index;
generate a physical broadcast channel (PBCH) demodulation reference signal (DMRS) sequence from a Gold code based on the initialization value; and
cause transmission of the PBCH DMRS.
18. The apparatus of claim 17 , wherein the modulus operation further comprises N ID cell mod 4, wherein N ID cell is the cell ID parameter.
19. The apparatus of claim 17 , wherein the mathematical floor operation further comprises └N ID cell /4┘.
20. The apparatus of claim 17 , wherein the one or more baseband processors are configured to calculate the initialization value based on the three least significant bits of the SS block index.