Abstract: Methods, systems, and devices are described for improving discontinuous reception (DRX) periods using enhanced physical HARQ indicator channel (PHICH) decoding. A user equipment (UE) may determine that an uplink (UL) retransmission (ReTx) is unnecessary based on the content of the original UL transmission. For example, the transmission may include media access control (MAC) layer padding rather than relevant application layer data. The UE may then identify a DRX sleep period that includes the subframe where the ReTx would take place. In some cases, the DRX sleep period may include a subframe where the UE would otherwise receive an acknowledgement message (AM) from a base station. The UE may then enter a DRX sleep state. In another example, the DRX sleep period is based on the content of a received AM. If the UE receives an ACK, the UL ReTx may be unnecessary.

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for a user equipment (UE) to transmit an uplink signal, even though the UE may not have received a negative acknowledgement (NACK) corresponding to the uplink signal from a network due to a tune away period. The method may generally include determining that an acknowledgement/negative acknowledgement (ACK/NACK) signal from a first network corresponding to an uplink signal is scheduled within a tune away period to a second network, and transmitting at least a portion of the uplink signal upon completion of the tune away period based on the determination.

Abstract: Methods, systems, and devices are described for transmitting scheduling requests for uplink transmission resources following a handover. A user equipment (UE) may determine that a handover from a first base station to a second base station has occurred, and may implement one or more processes to enhance efficiency in communications following the handover. A UE, for example, may wait for successful acquisition and/or derivation of timing information from a base station before attempting to schedule uplink resources with the base station.

Abstract: A method for wireless communication is disclosed. A time alignment timer is started. It is determined when the time alignment timer will expire. A time alignment request subframe that is prior to the time alignment timer expiring is identified. Uplink time alignment is requested in the time alignment request subframe.

Abstract: Certain aspects of the present disclosure relate to techniques and apparatus for a user equipment (UE) to delay RLC retransmissions (e.g., during off-durations, including CDRX off-durations). According to aspects of the present disclosure, a UE may delay triggering an RLC retransmission of an RLC PDU until after a next opportunity for the UE to receive an RLC ACK of the RLC PDU. By delaying RLC retransmissions, a UE may be prevented from waking up from one or more CDRX off-durations and using power associated with waking up from the one or more CDRX off-durations.

Abstract: Certain aspects of the disclosure relate generally to uplink flow control of wireless devices for mitigation of overload issues. A user equipment (UE) may reduce an average transmit power for the uplink channel based on whether an overload metric (e.g., temperature metric) exceeds a threshold value. The UE may perform duty cycling for an uplink control channel when an overactive uplink control channel is a dominating factor in a thermal issue. The UE may further reduce a maximum power transmit limit (MTPL) for one or more uplink channels, such as physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH).

Abstract: Certain aspects of the present disclosure provide techniques for defending against false semi-persistent scheduling (SPS) activation detection and/or missed SPS release. According to certain aspects, a user equipment (UE) may detect one or more conditions for a semi-persistent scheduling (SPS) activation or release are met based on a downlink transmission, generate one or more metrics related to downlink transmission, and determine a valid SPS activation or release has occurred if the one or more metrics satisfy one or more criteria. According to certain aspects, a UE may determine a valid semi-persistent scheduling (SPS) activation has occurred, detect a number of PDSCH CRC failures, and implicitly declare an SPS release based on the detection.

Abstract: A method for antenna switching is described. The method includes transmitting using a first antenna. The method also includes determining that a trigger occurs to switch to transmitting using a second antenna. The trigger is based on a combination of a physical uplink shared channel (PUSCH) maximum transmit power level (MTPL) counter and a physical uplink control channel (PUCCH) MTPL counter. The method further includes switching to transmitting using the second antenna based on the determination.

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in connection with controlling a flow of data in a user equipment (UE). In one example, a communications device is equipped to monitor at least one parameter related to processing of data at the UE, detect that the at least one parameter has passed a threshold, and autonomously trigger a discontinuous reception (DRX) mode of operation for the UE. In an aspect, the at least one parameter may include, but is not limited to, a data rate, Central Processing Unit (CPU) utilization, memory utilization, component temperature, etc. within the UE.

Abstract: A method for wireless communication is disclosed. A time alignment timer is started. It is determined when the time alignment timer will expire. A time alignment request subframe that is prior to the time alignment timer expiring is identified. Uplink time alignment is requested in the time alignment request subframe.

Abstract: Aspects generally relate to wireless communications and, more particularly, to methods, systems and apparatus for timing synchronization during a wireless uplink random access procedure. For example, certain aspects relate to a technique for receiving first timing advance information associated with uplink wireless communications with a base station (BS), transmitting a random access connection request message to the BS, receiving a random access response from the BS while the first timing advance information is within a valid time period, the random access response comprising second timing advance information associated with uplink wireless communications with the base station, determining, after receiving the random access response, that the valid time period for the first timing advance information has expired, and utilizing the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired.

Abstract: Certain aspects of the disclosure relate generally to uplink flow control of wireless devices for mitigation of overload issues. A user equipment (UE) may reduce an average transmit power for the uplink channel based on whether an overload metric (e.g., temperature metric) exceeds a threshold value. The UE may perform duty cycling for an uplink control channel when an overactive uplink control channel is a dominating factor in a thermal issue. The UE may further reduce a maximum power transmit limit (MTPL) for one or more uplink channels, such as physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH).