The present document covers Critical Communications. The main areas where the 3GPP system falls short in meeting the requirements of Critical Communications is latency, reliability, and availability. These requirements can be met with an improved radio interface, optimised architecture, and dedicated core and radio resources. Other requirements having emerged in TR 22.891, such, as, high bandwidth, high connection density, low complexity, low power consumption, and massive number of devices, are often irrelevant for Critical Communications.
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Availability (%):
Percentage value of the amount of time the 3GPP system is delivering services divided by the amount of time it is expected to deliver services in a specific area.
Reliability (%):
The amount of sent network layer packets successfully delivered to a given node within the time constraint required by the targeted service, divided by the total number of sent network layer packets.
Service continuity:
The uninterrupted user experience of a service that is using an active communication when a UE undergoes an access change without, as far as possible, the user noticing the change.
Tactile internet:
System where a human controls physical or real objects by tactile input, and receives tactile, audio, or visual feedback of his actions. The feedback has to arrive fast enough to give the impression of zero-latency control.
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
3D
The objective of this study is to develop use cases and identify potential service and operational requirements to enable 3GPP network operators to support Critical Communications. The following use case families have been identified in TR 22.891 in the area of Critical Communications
Higher reliability and lower latency
Higher reliability, higher availability and lower latency