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Content for  TS 23.246  Word version:  17.0.0

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8.16  MBMS Service Request ProcedureWord‑p. 63

For MBMS, when UTRAN wants to count the number of users that are interested in a specific MBMS service which are present in a cell, it will request a percentage of the interested UEs to transit to PMM-CONNECTED state. The MBMS Service Request procedure is used by a UE in the PMM IDLE state to move to the PMM-CONNECTED state. The MBMS Service Request procedure is also used by a UE in PMM IDLE or PMM-CONNECTED state to request to be maintained in PMM-CONNECTED state for the purpose of receiving data over an MBMS point-to-point radio bearer.
Copy of original 3GPP image for 3GPP TS 23.246, Fig. 17: MBMS Service Request procedure
Figure 17: MBMS Service Request procedure
(⇒ copy of original 3GPP image)
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Step 1.
An RRC connection is established if it doesn't already exist.
Step 2.
The UE sends a Service Request message to the SGSN if MBMS PTP reception shall be used or if otherwise required to do so by the RAN when MBMS reception shall be started. The Service Type shall indicate MBMS multicast service reception or MBMS broadcast service reception. The SGSN shall not release the Iu signalling connection until requested by the RAN.
Step 3.
The SGSN may perform the security functions.
Step 4.
The SGSN provides the RAN with the IMSI of the UE.
Step 5.
The SGSN provides the RAN with the MBMS UE context(s) (IP multicast address/APN, TMGI, MBMS_NSAPI) via MBMS UE Linking procedure, if the SGSN has active MBMS UE context(s) for the UE.
Step 6.
The RNC establishes the necessary radio resources for the transfer of MBMS data to the interested UEs.
Step 7.
When PTP transmission of a MBMS multicast or MBMS broadcast service is active for a UE then the RNC shall supervise the Iu signalling connection. When the RAN determines that it does not need to keep the UE in RRC-CONNECTED state anymore, it shall trigger a normal Iu release towards SGSN.
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8.17  Notification in case of parallel servicesWord‑p. 64

8.17.1  Notification of incoming CS domain call during an ongoing MBMS sessionWord‑p. 64

For the RRC connected mobiles in UTRAN, the RNS will have received the IMSI from the core network and hence is able to perform paging coordination. The UEs in RRC idle state in UTRAN need to perform paging coordination while receiving the MBMS session's user data.
In GERAN, this is achieved by the UE monitoring its paging channels while receiving the MBMS session's user data. If the mobile responses to the CS paging in GERAN, then the ongoing MBMS service is likely to be interrupted in the UE.

8.17.2  Notification of additional MBMS session during an ongoing MBMS sessionWord‑p. 64

For the RRC connected mobiles in UTRAN, the SGSN has sent the list of MBMS bearer services that the user has activated to the UTRAN. The RNS needs to notify an RRC connected UE.
For the UEs in RRC idle state, the UTRAN performs MBMS notification for the UE.
In GERAN, this is achieved by the UE monitoring its paging channel(s) where notification is sent while receiving the MBMS session's user data.
If the mobile accepts the new MBMS session in GERAN, then the ongoing MBMS service is likely to be interrupted in the UE.
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8.17.3  Notification of Mobile Terminating PS data during an ongoing MBMS sessionWord‑p. 64

For the RRC connected mobiles in UTRAN, the SGSN request the establishment of a RAB which will be used to deliver the MT user data.
For the UEs in RRC idle state, the UTRAN performs paging notification for the UE.
In GERAN, this is achieved by the UE monitoring its paging channels while receiving the MBMS session's user data.
If the mobile responses to the PS paging in GERAN, then the ongoing MBMS service is likely to be interrupted in the UE.

8.17.4  Notification of MBMS session during an ongoing CS or PS domain "connection"Word‑p. 64

When the UE establishes the UTRAN RRC connection for a CS service, the UE shall send a flag indicating that it has activated at least one MBMS bearer service. The RNC requests the SGSN to send the list of MBMS bearer services that the user has activated to enable the RNC to notify the UE when MBMS session starts.
When a UE moves to PMM-connected state, the SGSN sends the list of MBMS bearer services that the user has activated to the RNC. The RNC notifies the UE when an MBMS session of the user's activated MBMS bearer services starts.
These procedures are not supported by GERAN in this version of the specification.
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