Handling scheduling request collisions with an ACK/NACK repetition signal
Systems and methods for handling of scheduling request collisions with an ACK/NACK repetition signal are provided. A pending scheduling request may be refrained from being transmitted due to the collision. The SR counter may be refrained from incrementing and the SR prohibit timer may be refrained from starting such that additional latency is not introduced into the scheduling request procedure. Alternatively, a pending scheduling request may be transmitted with the ACK/NACK repetition signal in the same subframe when the collision occurs. The ACK/NACK repetition signal may be transmitted on the SR PUCCH resource to indicate a positive scheduling request. If there is no pending scheduling request to be transmitted, the ACK/NACK repetition signal may be transmitted on the ACK/NACK PUCCH resource.
1. A method in a user equipment (UE) comprising:
determining that there is a pending scheduling request (SR) transmission for a subframe;
determining whether the subframe is part of a measurement gap;
in response to determining that the subframe is not part of the measurement gap, determining that the pending SR transmission collides with a transmission of a repeated acknowledgement/negative acknowledgement (ACK/NACK) signal in the same frame, the repeated ACK/NACK signal being part of an ACK/NACK repetition sequence, wherein the ACK/NACK repetition sequence comprises an ACK/NACK signal and at least one repeated ACK/NACK signal;
responsive to the determining, refraining from transmitting the pending SR transmission; and
responsive to the determining, refraining from incrementing an SR counter.
2. The method of claim 1 , further comprising:
responsive to the determining that the pending SR transmission collides with the transmission of the repeated ACK/NACK signal, refraining from instructing a physical layer of the UE to signal the pending SR.
3. The method of claim 1 , further comprising:
responsive to the determining that the pending SR transmission collides with the transmission of the repeated ACK/NACK signal, refraining from starting an SR prohibit timer.
4. The method of claim 3 , wherein the SR prohibit timer has a value equal to an SR period multiplied by an integer in a range from 0 to 7, inclusive.
5. The method of claim 1 , further comprising transmitting a subsequent SR transmission.
6. The method of claim 5 , wherein the subsequent SR transmission is transmitted on a physical uplink control channel (PUCCH).
7. The method of claim 1 , further comprising determining that a physical uplink control channel (PUCCH) resource is available for the pending SR transmission prior to determining that the pending SR transmission collides with the repeated ACK/NACK signal.
8. 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.
9. The method of claim 1 , wherein the ACK/NACK repetition sequence comprises the ACK/NACK signal repeated 2, 4, or 6 times in consecutive uplink subframes.
10. The method of claim 1 , wherein the SR counter has an integer value in a range from 0 to a configured number, inclusive.