Packet duplication for high reliability communication
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for increasing the chances that a high reliability packet scheduled to be transmitted in a shared radio frequency spectrum is received by a receiving device. In one example, a wireless device (e.g., a base station or a user equipment (UE)) may duplicate a packet at a packet data convergence protocol (PDCP) layer for transmission on multiple listen before talk (LBT) subchannels of a carrier to improve reliability. In another example, a wireless device may duplicate a packet at a physical (PHY) layer for transmission on multiple LBT subchannels of a carrier to improve reliability, or the wireless device may encode and map the packet to multiple LBT subchannels of a carrier for transmission on the multiple LBT subchannels to improve reliability.
1. A method for wireless communication by a user equipment, comprising:
receiving one or more grants that schedule downlink or uplink transmission of a first physical layer (PHY) data packet via at least one of a first listen before talk (LBT) subchannel or a second LBT subchannel of a carrier; and
transmitting or receiving the first PHY data packet via the first LBT subchannel and a duplicate of the first PHY data packet via the second LBT subchannel of the carrier in accordance with the one or more grants.
2. The method of claim 1 , further comprising:
receiving configuration signaling indicating a rate matching scheme.
3. The method of claim 2 , wherein the transmitting or receiving further comprises:
receiving a first transmission of the first PHY data packet via the first LBT subchannel of the carrier and a second transmission of the first PHY data packet via the second LBT subchannel of the carrier;
de-rate matching the first transmission to generate a de-rate matched first transmission based at least in part on the rate matching scheme;
de-rate matching the second transmission to generate a de-rate matched second transmission based at least in part on the rate matching scheme; and
applying a decoding algorithm to the de-rate matched first transmission, the de-rate matched second transmission, or both.
4. The method of claim 3 , wherein the rate matching scheme indicates that the de-rate matched first transmission includes a first redundancy version generated from the first PHY data packet and at least a portion of a second redundancy version generated from the first PHY data packet.
5. The method of claim 2 , wherein the transmitting or receiving further comprises:
rate matching a first transmission of the first PHY data packet to generate a rate matched first transmission based at least in part on the rate matching scheme;
rate matching a second transmission of the first PHY data packet to generate a rate matched second transmission based at least in part on the rate matching scheme; and
transmitting the rate matched first transmission via the first LBT subchannel of the carrier and the rate matched second transmission via the second LBT subchannel of the carrier.
6. The method of claim 5 , wherein the rate matching scheme indicates that the rate matched first transmission includes a first redundancy version generated from the first PHY data packet and at least a portion of a second redundancy version generated from the first PHY data packet.
7. The method of claim 1 , further comprising:
receiving configuration signaling indicating a code rate; and
decoding the first PHY data packet based at least in part on the code rate.
8. The method of claim 1 , wherein receiving the one or more grants further comprises:
receiving a first grant scheduling a first transmission of the first PHY data packet via the first LBT subchannel of the carrier and a second grant scheduling a second transmission of the first PHY data packet via the second LBT subchannel of the carrier.
9. The method of claim 8 , further comprising:
determining an association between the first transmission and the second transmission based at least in part on the first grant and the second grant; and
soft combining the first transmission and the second transmission to decode the first PHY data packet based at least in part on the association.
10. The method of claim 9 , wherein determining the association further comprises:
identifying a common feedback identifier for the first LBT subchannel of the carrier and the second LBT subchannel of the carrier within a same transmission time interval, wherein the first transmission and the second transmission each correspond to the common feedback identifier.
11. The method of claim 8 , further comprising:
transmitting a joint feedback message via the first LBT subchannel, the second LBT subchannel, or both, to provide joint feedback on the first transmission and the second transmission.
12. The method of claim 8 , further comprising:
transmitting a first feedback message via the first LBT subchannel of the carrier to provide feedback on the first transmission and a second feedback message via the second LBT subchannel of the carrier to provide feedback on the second transmission.
13. The method of claim 1 , further comprising:
generating the duplicate of the first PHY data packet to include a duplication tag; and
generating a first transmission comprising the first PHY data packet and a second transmission comprising the duplicate of the first PHY data packet based at least in part on the duplication tag, wherein the transmitting or receiving further comprises:
transmitting the first transmission via the first LBT subchannel of the carrier and the second transmission via the second LBT subchannel of the carrier.
14. The method of claim 13 , wherein the first PHY data packet is a medium access control service data unit (MAC-SDU).
15. The method of claim 1 , further comprising:
receiving configuration signaling indicating at least one feedback resource for the first LBT subchannel, the second LBT subchannel, or both; and
transmitting, via the at least one feedback resource, a feedback message.
16. The method of claim 15 , wherein the transmitting or receiving further comprises:
receiving a first transmission of the first PHY data packet via the first LBT subchannel of the carrier and a second transmission of the first PHY data packet via the second LBT subchannel of the carrier, wherein the feedback message is a joint feedback message that provides feedback for the first transmission and the second transmission.
17. The method of claim 1 , wherein each of the first LBT subchannel and the second LBT subchannel is a different LBT subchannel of the carrier.
18. The method of claim 1 , wherein each of the first LBT subchannel and the second LBT subchannel is a different bandwidth part of the carrier.
19. The method of claim 1 , wherein the transmitting or receiving further comprises:
receiving a first transmission of the first PHY data packet via the first LBT subchannel of the carrier and a second transmission of the first PHY data packet via the second LBT subchannel of the carrier, wherein each of the first transmission and the second transmission is self-decodable.
20. A method for wireless communication by a network entity, comprising:
transmitting one or more grants scheduling downlink or uplink transmission of a first physical layer (PHY) data packet via at least one of a first listen before talk (LBT) subchannel or a second LBT subchannel of a carrier; and
transmitting or receiving the first PHY data packet via the first LBT subchannel and a duplicate of the first PHY data packet via the second LBT subchannel of the carrier in accordance with the one or more grants.
21. The method of claim 20 , further comprising:
transmitting configuration signaling indicating a rate matching scheme.
22. The method of claim 21 , wherein the transmitting or receiving further comprises:
receiving a first transmission of the first PHY data packet via the first LBT subchannel of the carrier and a second transmission of the first PHY data packet via the second LBT subchannel of the carrier;
de-rate matching the first transmission to generate a de-rate matched first transmission based at least in part on the rate matching scheme;
de-rate matching the second transmission to generate a de-rate matched second transmission based at least in part on the rate matching scheme; and
applying a decoding algorithm to the de-rate matched first transmission, the de-rate matched second transmission, or both.
23. The method of claim 22 , wherein the rate matching scheme indicates that the de-rate matched first transmission includes a first redundancy version generated from the first PHY data packet and at least a portion of a second redundancy version generated from the first PHY data packet.
24. The method of claim 23 , wherein the rate matching scheme indicates that the de-rate matched second transmission includes the first redundancy version of the first PHY data packet and at least a portion of a third redundancy version of the first PHY data packet, the second redundancy version differing from the third redundancy version.
25. The method of claim 21 , wherein the transmitting or receiving further comprises:
rate matching a first transmission of the first PHY data packet to generate a rate matched first transmission based at least in part on the rate matching scheme;
rate matching a second transmission of the first PHY data packet to generate a rate matched second transmission based at least in part on the rate matching scheme; and
transmitting the rate matched first transmission via the first LBT subchannel of the carrier and the rate matched second transmission via the second LBT subchannel of the carrier.
26. The method of claim 20 , wherein transmitting the one or more grants further comprises:
transmitting a first grant scheduling a first transmission of the first PHY data packet via the first LBT subchannel of the carrier and a second grant scheduling a second transmission of the first PHY data packet via the second LBT subchannel of the carrier.
27. The method of claim 20 , further comprising:
transmitting configuration signaling indicating at least one feedback resource for the first LBT subchannel, the second LBT subchannel, or both; and
receiving, via the at least one feedback resource, a feedback message.
28. An apparatus for wireless communication by a user equipment, comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive one or more grants scheduling downlink or uplink transmission of a first physical layer (PHY) data packet via at least of a first listen before talk (LBT) subchannel or a second LBT subchannel of a carrier; and
transmit or receive the first PHY data packet via the first LBT subchannel and a duplicate of the first PHY data packet via the second LBT subchannel of the carrier in accordance with the one or more grants.
29. An apparatus for wireless communication by a network entity, comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
transmit one or more grants scheduling downlink or uplink transmission of a first physical layer (PHY) data packet via at least one of a first listen before talk (LBT) subchannel or a second LBT subchannel of a carrier; and
transmit or receive the first PHY data packet via the first LBT subchannel and a duplicate of the first PHY data packet via the second LBT subchannel of the carrier in accordance with the one or more grants.