Slot structure for superposition transmission using a single antenna port
Methods, systems, and devices for wireless communications are described. A UE may support superimposed NR and LTE transmissions using an antenna port, in conjunction with an LTE-aware, NR slot structure (e.g., an NR V2X slot structure). In some aspects, the slot structure may protect portions of the LTE signal from interference, increasing LTE decoder robustness to interference which may provide opportunities for increasing the NR signal power. The UE may transmit a superimposed transmission of an LTE signal and an NR signal from a same antenna port in a same radio frequency resource. In some aspects, the slot structure may be modified so that the UE does not transmit when LTE reference signals are transmitted, so as to avoid interference with the LTE reference signals. A receiving UE may use the LTE reference signals to demodulate the LTE signal and the NR signal from the common time and frequency resources.
1. A method for wireless communications by a user equipment (UE), comprising:
communicating control signaling scheduling a superposition transmission of a first signal generated for a first radio access technology and a second signal generated for a second radio access technology, and indicating that the first signal and the second signal are each to be transmitted via a first antenna port within a first transmission time interval;
transmitting, via the first antenna port, the first signal within one or more symbol periods of the first transmission time interval allocated for a sidelink shared channel, a sidelink control channel, or both, in accordance with a first signal format of the first radio access technology that includes at least one reference signal symbol period; and
transmitting, via the first antenna port, the second signal in a plurality of symbol periods of the first transmission time interval other than the at least one reference signal symbol period.
2. The method of claim 1 , further comprising:
transmitting a reference signal of the first radio access technology within the at least one reference signal symbol period.
3. The method of claim 1 , wherein transmitting the first signal comprises:
transmitting the first signal within a first bandwidth, wherein the second signal is transmitted within the first bandwidth.
4. The method of claim 1 , wherein transmitting the first signal comprises:
transmitting the first signal within a first bandwidth, wherein the second signal is transmitted within a second bandwidth that is different than the first bandwidth.
5. The method of claim 1 , wherein transmitting the first signal comprises:
transmitting the first signal at a first transmission power level, wherein the second signal is transmitted at a second transmission power level that is different than the first transmission power level.
6. The method of claim 1 , wherein transmitting the second signal comprises:
transmitting the second signal in the plurality of symbol periods that differs from a second signal format for symbol periods within the first transmission time interval for the second radio access technology.
7. The method of claim 6 , wherein transmitting the second signal comprises:
transmitting the second signal that has at least one resource block shifted from a first symbol period to a second symbol within the first transmission time interval to avoid transmitting the at least one resource block within the at least one reference signal symbol period.
8. The method of claim 1 , wherein transmitting the second signal comprises:
transmitting the second signal based at least in part on a frequency offset corresponding to the first radio access technology.
9. The method of claim 1 , wherein transmitting the second signal comprises:
transmitting the second signal within the one or more symbol periods of the first transmission time interval allocated for the sidelink shared channel, the sidelink control channel, or both, in accordance with the first signal format of the first radio access technology.
10. The method of claim 1 , wherein the first radio access technology is a Long Term Evolution (LTE) radio access technology and the second radio access technology is a New Radio (NR) radio access technology.
11. A method for wireless communications by a user equipment (UE), comprising:
communicating control signaling scheduling a superposition transmission of a first signal generated for a first radio access technology and a second signal generated for a second radio access technology, and indicating that the first signal and the second signal are each to be transmitted via a first antenna port within a first transmission time interval;
receiving the first signal within one or more symbol periods of the first transmission time interval allocated for a sidelink shared channel, a sidelink control channel, or both, in accordance with a first signal format of the first radio access technology that includes at least one reference signal symbol period; and
receiving the second signal in a plurality of symbol periods of the first transmission time interval other than the at least one reference signal symbol period.
12. The method of claim 11 , further comprising:
receiving a reference signal of the first radio access technology within the at least one reference signal symbol period.
13. The method of claim 12 , further comprising:
demodulating the first signal, the second signal, or both, based at least in part on the reference signal.
14. The method of claim 11 , wherein receiving the first signal comprises:
receiving the first signal within a first bandwidth, wherein the second signal is transmitted within the first bandwidth.
15. The method of claim 11 , wherein receiving the first signal comprises:
receiving the first signal within a first bandwidth, wherein the second signal is transmitted within a second bandwidth that is different than the first bandwidth.
16. The method of claim 11 , wherein receiving the second signal comprises:
receiving the second signal in the plurality of symbol periods that differs from a second signal format for symbol periods within the first transmission time interval for the second radio access technology.
17. The method of claim 16 , wherein receiving the second signal comprises:
receiving the second signal that has at least one resource block shifted from a first symbol period to a second symbol within the first transmission time interval to avoid transmitting the at least one resource block within the at least one reference signal symbol period.
18. The method of claim 11 , wherein receiving the second signal comprises:
receiving the second signal based at least in part on a frequency offset corresponding to the first radio access technology.
19. The method of claim 11 , wherein receiving the second signal comprises:
receiving the second signal within the one or more symbol periods of the first transmission time interval allocated for the sidelink shared channel, the sidelink control channel, or both, in accordance with the first signal format of the first radio access technology.
20. The method of claim 11 , wherein the first radio access technology is a Long Term Evolution (LTE) radio access technology and the second radio access technology is a New Radio (NR) radio access technology.
21. An apparatus for wireless communications by a user equipment (UE), comprising:
a processor, memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
communicate control signaling scheduling a superposition transmission of a first signal generated for a first radio access technology and a second signal generated for a second radio access technology, and indicating that the first signal and the second signal are each to be transmitted via a first antenna port within a first transmission time interval;
transmit, via the first antenna port, the first signal within one or more symbol periods of the first transmission time interval allocated for a sidelink shared channel, a sidelink control channel, or both, in accordance with a first signal format of the first radio access technology that includes at least one reference signal symbol period; and
transmit, via the first antenna port, the second signal in a plurality of symbol periods of the first transmission time interval other than the at least one reference signal symbol period.
22. The apparatus of claim 21 , further comprising a transmitter, wherein the instructions are further executable by the processor to cause the apparatus to:
transmit, via the transmitter, a reference signal of the first radio access technology within the at least one reference signal symbol period.
23. The apparatus of claim 21 , wherein the instructions to transmit the first signal are executable by the processor to cause the apparatus to:
transmit the first signal within a first bandwidth, wherein the second signal is transmitted within the first bandwidth.
24. The apparatus of claim 21 , wherein the instructions to transmit the first signal are executable by the processor to cause the apparatus to:
transmit the first signal within a first bandwidth, wherein the second signal is transmitted within a second bandwidth that is different than the first bandwidth.
25. An apparatus for wireless communications by a user equipment (UE), comprising:
a processor, memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
communicate control signaling scheduling a superposition transmission of a first signal generated for a first radio access technology and a second signal generated for a second radio access technology, and indicating that the first signal and the second signal are each to be transmitted via a first antenna port within a first transmission time interval;
receive the first signal within one or more symbol periods of the first transmission time interval allocated for a sidelink shared channel, a sidelink control channel, or both, in accordance with a first signal format of the first radio access technology that includes at least one reference signal symbol period; and
receive the second signal in a plurality of symbol periods of the first transmission time interval other than the at least one reference signal symbol period.
26. The apparatus of claim 25 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive a reference signal of the first radio access technology within the at least one reference signal symbol period.
27. The apparatus of claim 26 , wherein the instructions are further executable by the processor to cause the apparatus to:
demodulate the first signal, the second signal, or both, based at least in part on the reference signal.