Section: 7.2.2 Scenarios and KPIs
Content: Different deployments of URLLC capabilities will depend on the 3GPP system being able to meet specific sets of KPIs with different values and ranges applicable for each attribute. A common, yet flexible, 5G approach to URLLC will enable the 5G system to meet the specific sets of KPIs needed in a given implementation. To provide clear and precise requirements for specific types of services, the corresponding KPI requirements are included in other specifications as follows: - Cyber-physical control applications in vertical domains can be found in 22.104 [21]. - V2X can be found in 22.186 [9]. - Rail communications can be found in 22.289 [23]. Some scenarios requiring very low latency and very high communication service availability are described below: - Motion control – Conventional motion control is characterised by high requirements on the communications system regarding latency, reliability, and availability. Systems supporting motion control are usually deployed in geographically limited areas but can also be deployed in wider areas (e.g. city- or country-wide networks), access to them can be limited to authorized users, and they can be isolated from networks or network resources used by other cellular customers. - Discrete automation – Discrete automation is characterised by high requirements on the communications system regarding reliability and availability. Systems supporting discrete automation are usually deployed in geographically limited areas, access to them can be limited to authorized users, and they can be isolated from networks or network resources used by other cellular customers. - Process automation – Automation for (reactive) flows, e.g. refineries and water distribution networks. Process automation is characterized by high requirements on the communications system regarding communication service availability. Systems supporting process automation are usually deployed in geographically limited areas, access to them is usually limited to authorized users, and it will usually be served by non-public networks. - Automation for electricity distribution and smart grid (mainly medium and high voltage). Electricity distribution and smart grid are is characterized by high requirements on the communications service availability and security, as well as low latency in some cases. In contrast to the above use cases, electricity distribution and smart grid are deeply immersed into the public space. Since electricity distribution is an essential infrastructure, it is well served by network slices to provide service isolation and security, or by non-public networks. - Wireless road-side infrastructure backhaul in intelligent transport systems – Automation solutions for the infrastructure supporting street-based traffic. This use case addresses the connection of the road-side infrastructure, e.g. roadside units, with other infrastructure, e.g. a traffic guidance system. As is the case for automation electricity, the nodes are deeply immersed into the public space. - Remote control – Remote control is characterised by a UE being operated remotely by a human or a computer. For example, Remote Driving enables a remote driver or a V2X application to operate a remote vehicle with no driver or a remote vehicle located in a dangerous environment. - Rail communications (e.g. railway, rail-bound mass transit) have been using 3GPP based mobile communication (e.g. GSM-R) already for some time, while there is still a driver on-board of the train. The next step of the evolution will be providing fully automated train operation that requires highly reliable communication with moderate latencies but at very high speeds of up to 500 km/h. For specific requirements, refer to the specifications noted above [21], [9], [23].