Avoiding out of order uplink data reception upon data radio bearer release, handover to another data radio bearer, or quality of service flow addition

A method of wireless communications, comprising:

• receiving a configuration of a protocol data unit (PDU) session, wherein the configuration does not identify a default data radio bearer (DRB) of the PDU session and a quality of service (QoS) flow of the PDU session does not have a QoS flow to DRB mapping rule configured;
• subsequent to a period elapsing after receiving the configuration, determining if the configuration still holds;
• when the configuration still holds:
• when a DRB of the PDU session that contains a QoS flow associated with a default QoS rule is configured to use uplink service data adaptation protocol (SDAP) headers, mapping the QoS flow to the DRB;
• and
• when the DRB of the PDU session that contains the QoS flow associated with the default QoS rule is not configured to use uplink SDAP headers, mapping the QoS flow to another DRB that does not contain a guaranteed bit rate (GBR) QoS flow and is configured to use uplink SDAP headers.

An apparatus of wireless communications, comprising:

• a processor configured to:
• receive a non-access stratum (NAS) protocol data unit (PDU) session modification command for a PDU session that adds a new quality of service (QoS) flow having a first QoS flow identifier (QFI);
• determine that the apparatus does not have an uplink QoS flow to data radio bearer (DRB) mapping rule for the QoS flow having the first QFI;
• and
• prevent, during a period subsequent to the determination, a service data adaptation protocol (SDAP) layer of the apparatus from processing and transmitting uplink data associated with the QoS flow having the first QFI;
• and
• a memory coupled with the processor.

An apparatus for wireless communications, comprising:

• a processor configured to:
• receive a configuration of a protocol data unit (PDU) session, wherein the configuration does not identify a default data radio bearer (DRB) of the PDU session and a quality of service (QoS) flow of the PDU session does not have a QoS flow to DRB mapping rule configured;
• determine if the configuration still holds subsequent to a period elapsing after receiving the configuration;
• map the QoS flow to the DRB, when the configuration still holds and when a DRB of the PDU session that contains a QoS flow associated with a default QoS rule is configured to use uplink service data adaptation protocol (SDAP) headers;
• and
• map the QoS flow to another DRB that does not contain a guaranteed bit rate (GBR) QoS flow and is configured to use uplink SDAP headers, when the configuration still holds and when the DRB of the PDU session that contains the QoS flow associated with the default QoS rule is not configured to use uplink SDAP headers;
• and
• a memory coupled with the processor.