Sidelink primary and secondary synchronization signal transmission
Apparatus and methods for S-SSB transmission are provided. In an aspect, an S-SSS symbol is followed by a gap symbol. In another aspect, a first PSBCH symbol is followed by an S-SSS symbol. In a further aspect, the same MPR is used for the entire S-SSB, thus reducing/mitigating transient periods. For example, the S-SSS symbols in the S-SSB may be selected from a set of sequences having the same MPR as the S-PSS symbols. Alternatively, the MPR of the entire S-SSB may be selected based on a sequence ID of an S-SSS. In an aspect, additional symbols may be configured in the S-SSB to compensate for power reduction.
1. A method of wireless communication, comprising:
selecting, by a user equipment (UE), at least one symbol of a sidelink primary synchronization signal block (S-PSS) having a first peak-to-average power ratio (PAPR) associated with a first maximum power reduction (MPR);
selecting, by the UE, at least one symbol of a sidelink secondary synchronization signal block (S-SSS) having a second PAPR that is different than the first PAPR and is associated with a second MPR that is different than the first MPR;
configuring, by the UE, a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
transmitting, by the UE, all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.
2. The method of claim 1 , wherein the first MPR is equal to the second MPR and equal to the third MPR.
3. The method of claim 2 , further comprising:
selecting the at least one symbol of the S-SSS from a set of sequences all having the third MPR.
4. The method of claim 1 , wherein the second MPR is dependent on a sequence identifier of the at least one symbol of the S-SSS, wherein the third MPR is equal to the second MPR and greater than the first MPR.
5. The method of claim 4 , further comprising:
including one or more additional symbols in the S-SSB for one or more components of the S-SSB whose MPR is less than the third MPR.
6. A user equipment (UE), comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to perform wireless communication comprising:
selecting at least one symbol of a sidelink primary synchronization signal block (S-PSS) having a first peak-to-average power ratio (PAPR) associated with a first maximum power reduction (MPR);
selecting at least one symbol of a sidelink secondary synchronization signal block (S-SSS) having a second PAPR that is different than the first PAPR and is associated with a second MPR that is different than the first MPR;
configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
transmitting all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.
7. The UE of claim 6 , wherein the first MPR is equal to the second MPR and equal to the third MPR.
8. The UE of claim 7 , wherein the one or more processors are configured to further execute the instructions to select the at least one symbol of the S-SSS from a set of sequences all having the third MPR.
9. The UE of claim 6 , wherein the second MPR is dependent on a sequence identifier of the at least one symbol of the S-SSS, wherein the third MPR is equal to the second MPR and greater than the first MPR.
10. The UE of claim 9 , wherein the one or more processors are configured to further execute the instructions to include one or more additional symbols in the S-SSB for one or more components of the S-SSB whose MPR is less than the third MPR.
11. A user equipment (UE) for wireless communication, comprising:
means for selecting at least one symbol of a sidelink primary synchronization signal block (S-PSS) having a first peak-to-average power ratio (PAPR) associated with a first maximum power reduction (MPR);
means for selecting at least one symbol of a sidelink secondary synchronization signal block (S-SSS) having a second PAPR that is different than the first PAPR and is associated with a second MPR that is different than the first MPR;
means for configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-S SS and the at least one symbol of the S-PSS; and
means for transmitting all symbols of the S-SSB with a third PAPR that is equal to an upper bound of the first MPR and the second MPR.
12. A non-transitory computer-readable medium comprising code executable by one or more processors of a user equipment (UE) to perform wireless communication comprising:
selecting at least one symbol of a sidelink primary synchronization signal block (S-SSS) having a first peak-to-average power ratio (PAPR) associated with a first maximum power reduction (MPR);
selecting at least one symbol of a sidelink secondary synchronization signal block (S-SSS) having a second PAPR that is different than the first PAPR and is associated with a second MPR that is different than the first MPR;
configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
transmitting all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.