Sidelink control channel successive parameter estimation
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, within a subframe, a plurality of sidelink control channel signals providing scheduling information for a plurality of sidelink shared channel signals that are also received within the subframe. The UE may determine to use one or more of the plurality of sidelink control channel signals as pilot signals for decoding the plurality of sidelink shared channel signals. The UE may decode the plurality of sidelink shared channel signals based at least in part on the plurality of sidelink control channel signals as pilot signals.
1. A user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
receive, from a first wireless device and within a subframe, a first plurality of sidelink control channel signals providing scheduling information for a first plurality of sidelink shared channel signals that are received within a first set of subcarriers of the subframe;
determine that at least one of a second plurality of sidelink control channel signals or a second plurality of sidelink shared channel signals is an interfering signal that is received from a second wireless device and within a second set of subcarriers of the subframe but that includes an interfering signal portion within the first set of subcarriers of the subframe, the second set of subcarriers being different from the first set of subcarriers;
perform an interference canceling procedure in order to cancel at least a portion of the interfering signal portion on one or more subcarriers in the second set of subcarriers that are within the first set of subcarriers of the subframe; and
decode the first plurality of sidelink shared channel signals after the interference canceling procedure.
2. The UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
decode the first plurality of sidelink control channel signals as first decoded sidelink control channel signals and the second plurality of sidelink control channel signals as second decoded sidelink control channel signals;
determine that the at least one of the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals is an interfering signal based at least in part on the first decoded sidelink control channel signals and the second decoded sidelink control channel signals.
3. The UE of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
identify that the interfering signal portion of the one or more subcarriers in the second plurality of sidelink control channel signals or second plurality of sidelink shared channel signals exceeds a predetermined signal strength threshold within first set of subcarriers associated with the first plurality of sidelink shared channel signals.
4. The UE of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
identify that the first plurality of sidelink shared channel signals received within the first set of subcarriers and the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals received within the second set of sub carriers are within a threshold frequency offset of each other.
5. The UE of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
identify that the first plurality of sidelink shared channel signals received within the first set of subcarriers and the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals received within the second set of subcarriers are adjacent to each other.
6. The UE of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
identify relative frequency domain positions of the first plurality of sidelink shared channel signals received within the first set of subcarriers and the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals received within the second set of subcarriers.
7. The UE of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
identify at least one of a modulation and coding scheme, a retransmission policy, or an allocation size and position of the first plurality of sidelink shared channel signals from the first decoded sidelink control channel signals; and
determine that the first plurality of sidelink shared channel signals is subject to interference by the at least one of the second plurality of sidelink control channel signals or second plurality of sidelink shared channel signals based at least in part on the modulation and coding scheme, the retransmission policy, or the allocation size and position of the first plurality of sidelink shared channel signals.
8. The UE of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
determine at least one of an estimated received power, an estimated signal-to-noise ratio, or an estimated frequency offset of the first plurality of sidelink shared channel signals based at least in part on a corresponding measured received power, a corresponding measured signal-to-noise ratio, or a corresponding measured frequency offset of the first decoded sidelink control channel signals; and
determine that the first plurality of sidelink shared channel signals is subject to interference by the at least one of the second plurality of sidelink control channel signals or second plurality of sidelink shared channel signals based at least in part on the estimated received power, the estimated signal-to-noise ratio, or the estimated frequency offset of the first plurality of sidelink shared channel signals.
9. The UE of claim 2 , wherein, to decode the first plurality of sidelink control channel signals and the second plurality of sidelink control channel signals, the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
verify that each of the first plurality of sidelink control channel signals and the second plurality of sidelink control channel signals passes a cyclic redundancy check.
10. The UE of claim 1 , wherein, to perform the interference canceling procedure, the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
re-encode the interfering signal, wherein the interference canceling procedure uses the re-encoded interfering signal to cancel at least the portion of the interfering signal portion within the first set of subcarriers of the subframe.
11. The UE of claim 1 , wherein, to perform the interference canceling procedure, the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
cancel at least a portion of frequency leakage in the first plurality of sidelink shared channel signals received within the first set of subcarriers of the subframe from at least one of the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals.
12. The UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
identify that the interfering signal is a compound of the at least one of the second plurality of sidelink control channel signals or second plurality of sidelink shared channel signals and at least one of a synchronization signal, a feedback signal, or a channel state information reference signal.
13. The UE of claim 1 , wherein the first plurality of sidelink control channel signals, the first plurality of sidelink shared channel signals, the second plurality of sidelink control channel signals, and the second plurality of sidelink shared channel signals are cellular vehicle-to-everything (CV2X) signals.
14. The UE of claim 1 , wherein the first plurality of sidelink control channel signals and the second plurality of sidelink control channel signals are physical sidelink control channel (PSCCH) signals and the first plurality of sidelink shared channel signals and the second plurality of sidelink shared channel signals are physical sidelink shared channel (PSSCH) signals.
15. A method for wireless communication at a user equipment (UE), comprising:
receiving, from a first wireless device and within a subframe, a first plurality of sidelink control channel signals providing scheduling information for a first plurality of sidelink shared channel signals that are received within a first set of subcarriers of the subframe;
determining that at least one of a second plurality of sidelink control channel signals or a second plurality of sidelink shared channel signals is an interfering signal that is received from a second wireless device and within a second set of subcarriers of the subframe but that includes an interfering signal portion within the first set of subcarriers of the subframe, the second set of subcarriers being different from the first set of subcarriers;
performing an interference canceling procedure in order to cancel at least a portion of the interfering signal portion on one or more subcarriers in the second set of subcarriers that are within the first set of subcarriers of the subframe; and
decoding the first plurality of sidelink shared channel signals after the interference canceling procedure.
16. The method of claim 15 , wherein determining that at least one of the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals is an interfering signal comprises:
decoding the first plurality of sidelink control channel signals as first decoded sidelink control channel signals and the second plurality of sidelink control channel signals as second decoded sidelink control channel signals, wherein the determining is based at least in part on the first decoded sidelink control channel signals and the second decoded sidelink control channel signals.
17. The method of claim 16 , wherein determining that at least one of the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals is an interfering signal further comprises:
identifying that the interfering signal portion of the one or more subcarriers in the second plurality of sidelink control channel signals or second plurality of sidelink shared channel signals exceeds a predetermined signal strength threshold within first set of subcarriers associated with the first plurality of sidelink shared channel signals.
18. The method of claim 16 , wherein determining that at least one of the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals is an interfering signal further comprises:
identifying that the first plurality of sidelink shared channel signals received within the first set of subcarriers and the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals received within the second set of sub carriers are within a threshold frequency offset of each other.
19. The method of claim 16 , wherein determining that at least one of the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals is an interfering signal further comprises:
identifying that the first plurality of sidelink shared channel signals received within the first set of subcarriers and the second plurality of sidelink control channel signals or the second plurality of sidelink shared channel signals received within the second set of subcarriers are adjacent to each other.
20. A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE), the code comprising instructions executable by one or more processors to:
receive, from a first wireless device and within a subframe, a first plurality of sidelink control channel signals providing scheduling information for a first plurality of sidelink shared channel signals that are received within a first set of subcarriers of the subframe;
determine that at least one of a second plurality of sidelink control channel signals or a second plurality of sidelink shared channel signals is an interfering signal that is received from a second wireless device and within a second set of subcarriers of the subframe but that includes an interfering signal portion within the first set of subcarriers of the subframe, the second set of subcarriers being different from the first set of subcarriers;
perform an interference canceling procedure in order to cancel at least a portion of the interfering signal portion on one or more subcarriers in the second set of subcarriers that are within the first set of subcarriers of the subframe; and
decode the first plurality of sidelink shared channel signals after the interference canceling procedure.