The metaverse integrates a variety of new technologies to form a new type of virtual and real internet application and social interaction form. Among these new technologies, wireless communication technology is essential, so 5G technology will undoubtedly be included in the metaverse technology system. This paper reports ongoing study on metaverse work by the third generation partnership project service & system aspects work group 1 (3GPP SA WG1), which is designed to study specific use cases and service requirements for 5GS (5G System) support of enhanced XR-based services, (as XR-based services are an essential part of metaverse services considered in this study) as well as potentially other functionality, to offer shared and interactive user experience of local content and services, accessed either by users in proximity or remotely. In this paper, we summarize the objectives of the 3GPP SA1 metaverse study item (SI) and discuss some of the most interesting proposed use cases discussed so far. We also introduce the new potential requirements for 5GS.