  Metaverse encapsulates our expectations of the next-generation Internet,
while bringing new key performance indicators (KPIs). Although conventional
ultra-reliable and low-latency communications (URLLC) can satisfy objective
KPIs, it is difficult to provide a personalized immersive experience that is a
distinctive feature of the Metaverse. Since the quality of experience (QoE) can
be regarded as a comprehensive KPI, the URLLC is evolved towards the next
generation URLLC (xURLLC) with a personalized resource allocation scheme to
achieve higher QoE. To deploy Metaverse xURLLC services, we study the
interaction between the Metaverse service provider (MSP) and the network
infrastructure provider (InP), and provide an optimal contract design
framework. Specifically, the utility of the MSP, defined as a function of
Metaverse users' QoE, is to be maximized, while ensuring the incentives of the
InP. To model the QoE mathematically, we propose a novel metric named
Meta-Immersion that incorporates both the objective KPIs and subjective
feelings of Metaverse users. Furthermore, we develop an attention-aware
rendering capacity allocation scheme to improve QoE in xURLLC. Using a
user-object-attention level dataset, we validate that the xURLLC can achieve an
average of 20.1% QoE improvement compared to the conventional URLLC with a
uniform resource allocation scheme. The code for this paper is available at
https://github.com/HongyangDu/AttentionQoE
