Devices and methods for managing quality of service flows migration among pdu sessions of the same ue

A first control plane entity for managing data traffic transmission of a plurality of traffic flows of user equipment (UE), wherein the plurality of traffic flows of the UE are associated with a pair of packet data network (PDU) sessions of the UE, wherein a first PDU session of the pair of PDU sessions is connectable to a data network using a first access network, and a second PDU session of the pair of PDU sessions is connectable to the data network using a second access network, wherein the first access network and the second access network are of a same type of radio access technology, and the first control plane entity comprises:

• a processor, and
• a memory coupled to the processor and storing processor-executable instructions, which upon being executed by the processor, facilitates the first control plane entity to:
• obtain first indication information, wherein the first indication information is indicative of whether one or more of the UE, the plurality of traffic flows, the first PDU session, the second PDU session, the pair of PDU sessions, and an application support flow migration capability,
• wherein the flow migration capability indicates a capability of switching the data traffic transmission between redundant transmission and parallel transmission,
• wherein for redundant transmission, data packets related to one or more first traffic flows from the plurality of traffic flows are duplicated in one or more second traffic flows from the plurality of flows, wherein the one or more first traffic flows are related to the first PDU session, and the one or more second traffic flows are related to the second PDU session, and
• for parallel transmission, the data packets related to the one or more first traffic flows are transmitted either in both of the first and second traffic flows, wherein the data packets exceeding the capacity of the one or more first traffic flows are transmitted in the one or more second traffic flows, or only in the one or more second traffic flows, wherein all data packets related to the one or more first traffic flows are transmitted in the one or more second traffic flows;
• determine that one or more of the UE, the plurality traffic flows, the first PDU session, the second PDU session, the pair of PDU sessions, and the application support flow migration capability based on the first indication information;
• determine flow migration information for the first PDU session and the second PDU session, wherein the flow migration information comprises mapping information among the one or more first traffic flows of the first PDU session (and the one or more second traffic flows of the second PDU session;
• and
• provide the flow migration information to one or more of the UE and a user plane entity.