Data unit in wireless system

A user plane function (UPF) comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the UPF to:

• receive, from a session management function (SMF), a data unit (DU) identification information for identifying a plurality of packets for one or more DUs of an application;
• receive:
• a first plurality of packets, of the plurality of packets, of a first DU of the application;
• and
• a second plurality of packets, of the plurality of packets, of a second DU of the application;
• and
• send, to an access node and using the DU identification information:
• a first general packet radio service tunneling protocol (GTP) container comprising a first GTP header comprising a first number identifying the first plurality of packets;
• and
• a second GTP container comprising a second GTP header comprising a second number identifying the second plurality of packets.

A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause a user plane function (UPF) to:

• receive, from a session management function (SMF), a data unit (DU) identification information for identifying a plurality of packets for one or more DUs of an application;
• receive:
• a first plurality of packets, of the plurality of packets, of a first DU of the application;
• and
• a second plurality of packets, of the plurality of packets, of a second DU of the application;
• and
• send, to an access node and using the DU identification information:
• a first general packet radio service tunneling protocol (GTP) container comprising a first GTP header comprising a first number identifying the first plurality of packets;
• and
• a second GTP container comprising a second GTP header comprising a second number identifying the second plurality of packets.