Patent ID: 11109262

Abstract:
A method and apparatus are disclosed from the perspective of a network node. The method includes the network node configuring a UE (User Equipment) with a first DRB (Data Radio Bearer), such that the first DRB is configured with a presence of SDAP (Service Data Adaptation Protocol) header and the network node is not allowed to reconfigure the first DRB for changing the presence of SDAP header to an absence of SDAP header after the first DRB is established. The method further includes the network node configuring the UE to serve a first QoS (Quality of Service) flow and a second QoS flow by the first DRB. The method also includes re-configuring the UE to serve the first QoS flow by a second DRB, which was originally served by the first DRB, when the second QoS flow is released or removed from the first DRB, such that the second DRB is configured with an absence of SDAP header.