# 6G Use Cases and Scenarios: A Comparison Analysis Between ITU and Other Initiatives
## 2 The ITU Activities on 6G  
_ITU Preliminary Work on 6G System_  
In November 2022 the ITU Radiocommunication Sector (ITU-R) published the Recommendation ITU-R M.2156 [5] concerning the preliminary work on IMT-2030, already known as 6G, including the usage scenarios and use cases. In November 2023, a second ITU-R Recommendation [3], was released on the 6G framework to finalize the proposedusage scenarios and their related capabilities. From 2024 to 2027, the requirement definition is expected, as per the ITU roadmap shown in Figure 1.  
In the ITU document [3], the 6G usage scenarios are related to the SDGs in terms of (i) inclusivity, (ii) ubiquitous connectivity, (iii) sustainability, (iv) innovation, (v) enhanced security, (vi) privacy, and (vii) inter-working. The future 6G should guarantee connectivity to everyone worldwide and expand the coverage of broadband services. 6G should be economically, socially, and environmentally sustainable. It should also be innovative in terms of innovative technologies enhancing usability and improving security, privacy, and resilience from the end user perspective. Finally, the network infrastructures of the next wireless communication systems will be compliant with 3 GPP standards and interoperable. They will also enable the inter-working between Terrestrial Networks (TNs) and Non-Terrestrial Networks (NTNs). The ITU's 6G usage scenarios are summarized in Figure 2.  
Three of the scenarios in Figure 2 have been derived from those defined for 5G, i.e., enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communications (URLLCs), and massive Machine Type Communications (mMTCs). These are now indicated as immersive communication, massive communication, and hyper-reliable and low-latency  
Figure 1: The ITU 6G roadmap. Figure 2: Six usage scenarios and four over-background aspects approved by ITU-R [3]. communication. The three new usage scenarios focus on (i) ubiquitous connectivity, (ii) integrated sensing and communication (ISAC), and (iii) AI and communication. Immersive communication focuses on enhanced mobile services where humans and machines strongly interact. Significant examples focus on communications for immersive mixed reality (XR); remote multi-sensory telepresence; holographic communications; mixed traffic of video, audio, and environmental data with time synchronization; and standalone support of voice. Massive communication considers scenarios with a huge number of interconnected devices, even including sensors and actuators. Typical examples include innovative applications in smart cities, oriented to logistics, health, agriculture, energy, and environmental monitoring. HRLLC constitutes the enhancement of the IMT-2020 URLLC scenario. It includes all applications that are demanding in terms of reliability and latency. Some examples include full automation, control, and operations in an industrial environment. Moreover, robotic applications, emergency services, telemedicine/tele-surgery, and electrical power monitoring can be added. Ubiquitous connectivity aims to provide connectivity everywhere and especially in digital divide areas, such as rural or sparsely populated areas. Typical scenarios include the Internet of Things (IoT) and mobile broadband communication. The ISAC is capable of providing intelligent sensing in wide areas and location information. Typical use cases focus on mapping environment reconstruction, motion recognition, tracking, emergency or disaster monitoring, surveillance, and assisted navigation. It also includes data on AI, XR, and Digital Twin applications for building reconstruction. Finally, the AI and communication scenario considers distributed computing and AI-enabled applications for consumer and corporate customers. AI-as-a-Service (AlaaS) is the emergent paradigm allowing customers to develop their AI-based applications using the available AI tools.