US 11,778,654 B2 · Handling missed hybrid automatic repeat request (HARQ) opportunities, multiple HARQ opportunities, or both for discontinuous reception (DRX)

Abstract

This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for handling hybrid automatic repeat request (HARQ) processes with discontinuous reception (DRX) operations. A user equipment (UE) may use timers to maintain an ON duration in DRX. The UE may receive, via downlink control information (DCI), an indication of a feedback transmission opportunity (TxOP) for a HARQ process. The UE may activate a timer at the end of the TxOP regardless of whether the UE transmits feedback in the TxOP to ensure that the UE remains active. In some implementations, a base station may provide the UE with multiple opportunities to transmit a feedback message. The UE may reactivate a timer after each feedback TxOP for the same HARQ process or may activate the timer after the first feedback TxOP and may refrain from activating the timer after subsequent feedback TxOPs for the HARQ process.

Claims30

Dependent claims

An apparatus for wireless communications, comprising:

a first interface configured to:
output a first downlink control information (DCI) message for a user equipment (UE) scheduling a downlink data message and indicating a first feedback transmission opportunity (TxOP) for a hybrid automatic repeat request (HARQ) process for the downlink data message;
and
a processing system configured to:
determine an active time for the UE to monitor a downlink control channel based at least in part on a round-trip time (RTT) timer and a retransmission timer, wherein the RTT timer is activated based at least in part on an end of the first feedback TxOP,
the first interface further configured to:
output a second DCI message for the UE indicating a second feedback TxOP for the HARQ process for the downlink data message subsequent to the first feedback TxOP, and
the processing system further configured to:
further determine the active time for the UE to monitor the downlink control channel based at least in part on the RTT timer and the retransmission timer, wherein the RTT timer is reactivated based at least in part on an end of the second feedback TxOP.

6 more elements

A method for wireless communications at an apparatus of a base station, comprising:

transmitting, to a user equipment (UE) and via a downlink control channel, a first downlink control information (DCI) message scheduling a downlink data message and indicating a first feedback transmission opportunity (TxOP) for a hybrid automatic repeat request (HARQ) process for the downlink data message;
determining an active time for the UE to monitor the downlink control channel based at least in part on a round-trip time (RTT) timer and a retransmission timer, wherein the RTT timer is activated based at least in part on an end of the first feedback TxOP;
transmitting, to the UE and via the downlink control channel, a second DCI message for the UE during the determined active time for the UE and indicating a second feedback TxOP for the HARQ process for the downlink data message subsequent to the first feedback TxOP;
and
further determining the active time for the UE to monitor the downlink control channel based at least in part on the RTT timer and the retransmission timer, wherein the RTT timer is reactivated based at least in part on an end of the second feedback TxOP.

2 more elements

A method for wireless communications at an apparatus of a user equipment (UE), comprising:

receiving a first downlink control information (DCI) message scheduling a downlink data message, wherein the first DCI message indicates a first feedback transmission opportunity (TxOP) for a hybrid automatic repeat request (HARQ) process for the downlink data message;
activating a round-trip time (RTT) timer corresponding to the HARQ process subsequent to the first feedback TxOP for the downlink data message and based at least in part on an end of the first feedback TxOP;
receiving a second DCI message indicating a second feedback TxOP for the HARQ process for the downlink data message subsequent to the first feedback TxOP;
and
reactivating the RTT timer corresponding to the HARQ process subsequent to the second feedback TxOP for the downlink data message and based at least in part on an end of the second feedback TxOP.

2 more elements

Dependencies are inferred from the claim text.

Handling missed hybrid automatic repeat request (HARQ) opportunities, multiple HARQ opportunities, or both for discontinuous reception (DRX)

Life of this patent

Handling missed hybrid automatic repeat request (HARQ) opportunities, multiple HARQ opportunities, or both for discontinuous reception (DRX)

Life of this patent

Abstract

Claims30