System and method for handling of an uplink transmission collision with an ACK/NACK signal

Abstract

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.

What is claimed is: 
     
       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.