System and method for handling of an uplink transmission collision with an ACK/NACK signal
View Patent ↗Systems and methods for handling of an uplink transmission collision with an ACK/NACK signal are provided. The scheduled uplink transmission is refrained due to the collision. Subsequent non-adaptive retransmission for the scheduled uplink transmission may be refrained by delivering an ACK for the scheduled uplink transmission to high layers. Alternatively, subsequent non-adaptive retransmission for the scheduled uplink transmission may be refrained by setting the HARQ feedback for the scheduled transmission to ACK. In some implementations, a subsequent non-adaptive retransmission for the scheduled uplink transmission may be transmitted. If a subsequent non-adaptive retransmission is to be transmitted, the HARQ redundancy version for the subsequent non-adaptive retransmission is refrained from incrementing from the original redundancy version for the scheduled uplink transmission.
1. A method of operating a user equipment (UE) in a wireless communications network, the method comprising:
determining, by the UE, a potential collision between a scheduled uplink transmission and an uplink transmission of an acknowledgement/negative acknowledgement (ACK/NACK) signal, both the scheduled uplink transmission and the uplink transmission of ACK/NACK are to be transmitted by the UE;
in response to determining the potential collision,
refraining, by the UE, from transmitting the scheduled uplink transmission;
delivering, by the UE, an ACK for the scheduled uplink transmission from a physical layer to higher layers; and
refraining, by the UE, from transmitting a subsequent non-adaptive retransmission for the scheduled uplink transmission.
2. The method of claim 1 , wherein the higher layers comprise a medium access control (MAC) layer.
3. The method of claim 1 , further comprising identifying, by a medium access control (MAC) layer of the UE, a collision between the scheduled uplink transmission and the ACK/NACK signal.
4. The method of claim 3 , further comprising setting a hybrid automatic repeat request (HARQ) feedback for the scheduled uplink transmission to an ACK by an HARQ process.
5. The method of claim 1 , further comprising transmitting a subsequent adaptive retransmission for the scheduled uplink transmission.
6. The method of claim 1 , wherein the scheduled uplink transmission is a scheduled physical uplink shared channel (PUSCH) transmission.
7. The method of claim 1 , wherein the ACK/NACK signal is transmitted on an uplink in response to a physical downlink shared channel (PDSCH) reception.
8. The method of claim 1 , wherein the ACK/NACK signal is a part of an ACK/NACK repetition sequence.
9. The method of claim 8 , wherein the ACK/NACK repetition sequence comprises the ACK/NACK signal repeated 2, 4, or 6 times in consecutive uplink subframes.
10. A user equipment (UE) for operating in a wireless communications network, comprising one or more processors configured to:
determine a potential collision between a scheduled uplink transmission and an uplink transmission of an acknowledgement/negative acknowledgement (ACK/NACK) signal, both the scheduled uplink transmission and the uplink transmission of ACK/NACK are to be transmitted by the UE;
in response to determining the potential collision:
refrain from transmitting the scheduled uplink transmission;
deliver an ACK for the scheduled uplink transmission from a physical layer to higher layers; and
refrain from transmitting a subsequent non-adaptive retransmission for the scheduled uplink transmission.
11. The user equipment of claim 10 , wherein the higher layers comprise a medium access control (MAC) layer.
12. The user equipment of claim 10 , the one or more processors further configured to identify, by a medium access control (MAC) layer, a collision between the scheduled uplink transmission and the ACK/NACK signal.
13. The user equipment of claim 10 , the one or more processors further configured to set a hybrid automatic repeat request (HARQ) feedback for the scheduled uplink transmission to an ACK by an HARQ process.
14. The user equipment of claim 10 , the one or more processors further configured to transmit a subsequent adaptive retransmission for the scheduled uplink transmission.
15. The user equipment of claim 10 , wherein the scheduled uplink transmission is a scheduled physical uplink shared channel (PUSCH) transmission.
16. The user equipment of claim 10 , wherein the ACK/NACK signal is transmitted on an uplink in response to a physical downlink shared channel (PDSCH) reception.
17. The user equipment of claim 10 , wherein the ACK/NACK signal is a part of an ACK/NACK repetition sequence.
18. The user equipment of claim 17 , wherein the ACK/NACK repetition sequence comprises the ACK/NACK signal repeated 2, 4, or 6 times in consecutive uplink subframes.