The present document studies solutions to recommend application layer FEC technologies which will provide the most significant enhancement to the performance of Mission Critical services (i.e., MCVideo, MCPTT and MCData) for Release 15.

The objective of the present document is to document the progress of the study item to investigate and recommend an FEC scheme for MCVideo that can be utilized equally by the two FEC procedures specified in TS 23.280. The study will also consider whether the same or a similar scheme may be utilized for other MC services over MBMS (e.g. MCData - file download, or MCPTT group communications). The use of FEC is within the context of the MC services common functional architecture as explained in subclause 5.2.6 of TS 23.280. This study item will build upon the existing stage-2 application architecture for MC services as defined in TS 23.280, TS 23.281, TS 23.282, and TS 23.379.

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