The MBMS user service architecture offers a set of delivery methods to applications, specified in TS 26.346
. The MBMS download delivery method is used for the delivery of files over MBMS and provides reliability control by means of forward-error-correction.
The MCData File Distribution capability can use the MBMS download delivery method by including, in the MC service-on network architecture (subclause 5.2.6 of TS 23.280
), the MBMS user service architecture (TS 26.346
), with the MCData server assuming the role of the content provider.
The MCData server may determine the MBMS broadcast area based on the cell identities of the affiliated group members received over GC1.
When the xMB interface is used, the MCData server uses the xMB mission critical extension, specified in TS 26.348
to control the QoS and the MBMS broadcast area of the MBMS user services. The MCData server also provides a file delivery manifest over xMB‑C
(see subclause 5.6.2 of TS 26.348
) describing the list of files to be broadcasted, and, for each file, the target completion date and the number of repetitions.
The MBMS user service metada, which provides the delivery and schedule parameters, are returned to the MCData server after the MBMS session creation or update, under the form of a SA file (annex L.3A from TS 26.346
). The MCData server signals this SA file, together with the service id and the uri of the file to be received to the targeted MCData clients.