In the Beginning... QoE sits at a confluence point between several disciplines, and one of those is QoS. Back when I started working on these topics, "QoE" was not a thing, we (networking people) would talk about "QoS from the user's perspective", or similar kludgy terms, for lack of a proper one. The underlying concept, however, was clear: how does QoS in the network affect the user's perception of media quality.