Abstract
Digital network twins (DNTs), by representing a physical network using a
virtual model, offer significant benefits such as streamlined network
development, enhanced productivity, and cost reduction for next-generation
(nextG) communication infrastructure. Existing works mainly describe the
deployment of DNT technologies in various service sections.The full life cycle
of DNTs for telecommunication has not yet been comprehensively studied,
particularly in the aspects of fine-grained creation, real-time adaptation,
resource-efficient deployment, and security protection. This article presents
an in-depth overview of DNTs, exploring their concrete integration into
networks and communication, covering the fundamental designs, the emergent
applications, and critical challenges in multiple dimensions. We also include
two detailed case studies to illustrate how DNTs can be applied in real-world
scenarios such as wireless traffic forecasting and edge caching. Additionally,
a forward-looking vision of the research opportunities in tackling the
challenges of DNTs is provided, aiming to fully maximize the benefits of DNTs
in nextG networks.