  Extended Reality (XR) is one of the major innovations to be introduced in
5G/5G-Advanced communication systems. A combination of augmented reality,
virtual reality, and mixed reality, supplemented by cloud gaming, revisits the
way how humans interact with computers, networks, and each other. However,
efficient support of XR services imposes new challenges for existing and future
wireless networks. This article presents a tutorial on integrating support for
the XR into the 3GPP New Radio (NR), summarizing a range of activities handled
within various 3GPP Service and Systems Aspects (SA) and Radio Access Networks
(RAN) groups. The article also delivers a case study evaluating the performance
of different XR services in state-of-the-art NR Release 17. The paper concludes
with a vision of further enhancements to better support XR in future NR
releases and outlines open problems in this area.
