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LTE MBMS: What does the use of tmgi and session Id ?

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LTE MBMS: What does the use of tmgi and session Id ?
posted Jul 27, 2014 by Ganesh

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1 Answer

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TMGI stands for "Temporary Mobile Group Identity". While establishing each eMBMS session, BM-SC server provides provides a unique identifier i.e. TMGI to identify a MBMS session within the PLMN.
TMGI is a combination of "PLMN" + "Service Id" . As usual, PLMN is encoded by using 3 octets and service id is also 3 bytes long.

SessionId is an optional information which may be provided by BM-SC server at the time of session establishment.

answer Jul 27, 2014 by Vimal Kumar Mishra
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MBMS Data receives from MBMS-GW to eNodeB module interfacing towards MBMS-GW. It removes GTP-U header and sends data to lower layer i.e RLC. As per my understanding so far, RLC does segmentation and re-assembling for the received upper layer PDU to make it fit into MAC PDU. Now I want to know, Does the same concept applicable for MBMS data also or for RLC it is transparent mode transmission.

Which format is used by RLC for the MBMS transmission ?

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In case of UE specific data transmission MAC layer allocates radio resources on dynamic basis. When we say dynamic resource allocation it means in each TTI (subframe) different amount of data is sent over the over considering various factor QCI, amount of data buffered at RLC and available radio resource.
What about the MBMS data transmission. MBSFN subrames are fixed in radio frame for the MBMS data transmission. Is there really need of any dynamic resources allocation for the MBMS data comes from RLC layer or it is persistent since required modulation and coding other parameters are already known at the time of bearer establishment and these parameters does not change throughout the data transmission of MBMS data.

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