This subclause defines information flows and procedures for MBMS usage that applies to MC services. MBMS bearers can be used by any MC service for any MC service group. A single MBMS bearer can be used for one or more MC services within a single group or by multiple group communications in parallel.
The following subclauses specify the procedures and information flows for the usage of MBMS transmission that are utilised by the following MC services:
MC service specific pre-requisites and resultant behaviour by functional entities in performing these procedures are specified in the respective MC service TSs as listed above.
A list of additional alternative TMGI may be included and used in roaming scenarios.
QCI
O
QCI information used by the ProSe UE-Network Relay to determine the ProSe Per-Packet Priority value to be applied for the multicast packets relayed to Remote UE over PC5
List of service area identifier
M
A list of service area identifier for the applicable MBMS broadcast area.
Frequency
O
Identification of frequency if multi carrier support is provided
SDP information
M
SDP with media and floor control information applicable to groups that can use this bearer (e.g. codec, protocol id, FEC information)
Monitoring state
O
The monitoring state is used to control if the client is actively monitoring the MBMS bearer quality or not.
Announcement acknowledgment
O
Indicate if the MBMS server requires an acknowledgement of the MBMS bearer announcement.
Unicast status
O
An indication that the listening status of the unicast bearer is requested.
ROHC information
O
Indicate the usage of ROHC and provide the parameters of the ROHC channel to signal to the ROHC decoder.
Table 10.7.2.2-1 describes the information flow for the MBMS listening status report from MC service client to MC service server. The information is used for the decision on the switching from MBMS bearer to unicast bearer or vice versa.
Table 10.7.2.3-1 describes the information flow for the MBMS suspension reporting instruction from MC service server to MC service client in a unicast bearer for MBMS suspension reporting.
Enables or disable the suspension reporting for a specific MC service client
Table 10.7.2.3-2 describes the information flow for the MBMS suspension reporting instruction from MC service server to MC service client in a multicast bearer for MBMS suspension reporting.
Table 10.7.2.4-1 describes the information flow discover bearer request from the MC service server to another MC service server (MBMS bearer control role).
Table 10.7.2.5-1 describes the information flow discover bearer response from an MC service server (MBMS bearer control role) to the MC service server.
A list of service area identifiers for the applicable MBMS broadcast areas, corresponding to the listed TMGIs, over which the request was successful.
Frequency
O
Identification of the frequency if multi-carrier support is provided
QCI
O
QCI information used by the ProSe UE-Network relay to determine the ProSe per-packet priority value to be applied for the multicast packets relayed to a remote UE over PC5.
Table 10.7.2.6-1 describes the information flow media distribution request from the MC service server to an MC service server (MBMS bearer control role) that has a desired bearer.
Table 10.7.2.7-1 describes the information flow media distribution response from an MC service server (MBMS bearer control role) that has a desired bearer to the MC service server.
Table 10.7.2.10-1 describes the information flow media distribution release from the MC service server to an MC service server (MBMS bearer control role) that has the used bearer.