Defining multi-access steering, switching and splitting functionalities with backward compatibility

Abstract

A method performed by a user equipment is provided. The method includes determining that access traffic steering, switching and splitting (ATSSS) is supported by a network with which the UE is registered, and sending to the network information indicating ATSSS capabilities of the UE. The information is structured in an information element including a field set to indicate ATSSS steering functionalities and steering modes supported by the UE, and including a bit outside of the field that is set to indicate whether the UE supports ATSSS low layer functionality with only active-standby steering mode. The method includes receiving from the network one or more ATSSS rules determined by the network based on the ATSSS supported by the network and the ATSSS capabilities of the UE. And the method includes steering, splitting and / or switching traffic for a protocol data unit session based on the one or more ATSSS rules.

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