To position LTE as technology for critical communications such as public safety, Group Communication is needed.
Group Communication function complements its sibling communication feature of proximity-based services (ProSe).
This TS collects the requirements as relevant to improve the EPC and E-UTRAN for system enablers to the 3GPP system to support Group Communication over LTE for Public Safety and Critical Communication.
A Group Communication Service is intended to provide a fast and efficient mechanism to distribute the same content to
multiple users in a controlled manner. As an example, the concept of group communications is used extensively in the
operation of classical Land Mobile Radio (LMR) systems used for, but not limited to, Public Safety organizations. At
the moment, the primary use of a Group Communication Service in LMR is to provide "Push to Talk" (PTT)
functionality, so a Group Communication Service based on 3GPP architecture, using LTE radio technology, should
enable PTT voice communications with comparable performance.
The service should allow flexible modes of operation as the users and the environment they are operating in evolves.
For example, the capabilities of LTE allow for broadband communication, so Group Communication Service is
expected to support, voice, video or, more general, data communication. Also LTE can allow users to communicate to
several groups at the same time in parallel e.g. voice to one group, different streams of video or data to several other
The users of Group Communication Service are organised into groups; a user can be member of more than one group.