This clause defines AT commands that a TE may use to control MT supporting evolved Multimedia Broadcast Multicast Service (eMBMS). eMBMS is a unidirectional point-to-multipoint service in which data is transmitted from a single source entity to a group of users in a specific area. eMBMS services are transmitted on the same carrier frequencies used by mobile operators to provide other typical services such as voice calls and internet. There are various types of eMBMS services that can be provided to the end user such as Mobile TV, streaming, file download, etc.
eMBMS information is sent over SystemInformationBlockType13 information element (SIB-13) according to clause 6.3.1 of TS 36.331
. Information on eMBMS parameters can be found in TS 36.443
and TS 29.061
A comprehensive set of eMBMS-specific commands is defined to provide the flexibility needed by the more complex MT. The commands are designed to be expandable to accommodate new eMBMS feature options and interface protocols, merely by defining new values for many of the parameters. The commands use the extended information and error message capabilities described in this specification.
The +CEMBMSCFG command enables or disables the eMBMS support in the MT. Once the eMBMS service is enabled then the status of the eMBMS session can be received by enabling the URC using the +CEMBSR command. The +CEMBSR command also provides information about the TMGI and eMBMS session being used by the MT. The +CEMBMSDATA command can be used by the MT to configure the data channel to use for receiving eMBMS services. The +CEMBMSSRV command is used to configure and activate the eMBMS service for a specific TMGI and listen for any service change indications. The +CEMBMSCNT command can be used to set the list of TMGIs from which the MT can receive eMBMS services.