Method and apparatus for processing data unit in wireless communication system

A user equipment (UE) in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, by a Service Data Adaptation Protocol (SDAP) entity of the UE, a SDAP Service Data Unit (SDU) from an upper layer;
• generating, by the SDAP entity of the UE, a SDAP protocol data unit (PDU) including a SDAP header and the SDAP SDU;
• and
• submitting, by the SDAP entity of the UE, the SDAP PDU to a lower layer,
• wherein the SDAP header includes a Quality of Service (QoS) Flow Identifier (QFI) field,
• wherein, based on the QFI field being a specific value, the SDAP header further includes an extended QFI field having a value corresponding to the SDAP SDU, and
• wherein, based on the QFI field not being the specific value, the SDAP header does not include the extended QFI field and the QFI field has the value corresponding to the SDAP SDU.

An apparatus for a user equipment (UE), the apparatus comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, by a Service Data Adaptation Protocol (SDAP) entity of the UE, a SDAP Service Data Unit (SDU) from an upper layer;
• generating, by the SDAP entity of the UE, a SDAP protocol data unit (PDU) including a SDAP header and the SDAP SDU;
• and
• submitting, by the SDAP entity of the UE, the SDAP PDU to a lower layer,
• wherein the SDAP header includes a Quality of Service (QoS) Flow Identifier (QFI) field,
• wherein, based on the QFI field being a specific value, the SDAP header further includes an extended QFI field having a value corresponding to the SDAP SDU, and
• wherein, based on the QFI field not being the specific value, the SDAP header does not include the extended QFI field and the QFI field has the value corresponding to the SDAP SDU.

A non-transitory computer readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user equipment (UE), the operations comprising:

• receiving, by a Service Data Adaptation Protocol (SDAP) entity of the UE, a SDAP Service Data Unit (SDU) from an upper layer;
• generating, by the SDAP entity of the UE, a SDAP protocol data unit (PDU) including a SDAP header and the SDAP SDU;
• and
• submitting, by the SDAP entity of the UE, the SDAP PDU to a lower layer,
• wherein the SDAP header includes a Quality of Service (QoS) Flow Identifier (QFI) field,
• wherein, based on the QFI field being a specific value, the SDAP header further includes an extended QFI field having a value corresponding to the SDAP SDU, and
• wherein, based on the QFI field not being the specific value, the SDAP header does not include the extended QFI field and the QFI field has the value corresponding to the SDAP SDU.

A method for processing a data unit by a Service Data Adaptation Protocol (SDAP) entity of a base station (BS) in a wireless communication system, the method comprising:

• receiving a SDAP protocol data unit (PDU) including a SDAP header and the SDAP service data unit (SDU) from a lower layer;
• and
• delivering the SDAP SDU to an upper layer,
• wherein the SDAP header includes a Quality of Service (QoS) Flow Identifier (QFI) field,
• wherein, based on the QFI field being a specific value, the SDAP header further includes an extended QFI field having a value corresponding to the SDAP SDU, and
• wherein, based on the QFI field not being the specific value, the SDAP header does not include the extended QFI field and the QFI field has the value corresponding to the SDAP SDU.

A base station (BS) in a wireless communication system, the BS comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, by a Service Data Adaptation Protocol (SDAP) entity of the BS, a SDAP protocol data unit (PDU) including a SDAP header and the SDAP service data unit (SDU) from a lower layer;
• and
• delivering, by the SDAP entity of the BS, the SDAP SDU to an upper layer,
• wherein the SDAP header includes a Quality of Service (QoS) Flow Identifier (QFI) field,
• wherein, based on the QFI field being a specific value, the SDAP header further includes an extended QFI field having a value corresponding to the SDAP SDU, and
• wherein, based on the QFI field not being the specific value, the SDAP header does not include the extended QFI field and the QFI field has the value corresponding to the SDAP SDU.