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LTE MBMS: What is the significance of presence of "Time of MBMS Data Stop" IE within the MBMS Session Stop Request?

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LTE MBMS: What is the significance of presence of "Time of MBMS Data Stop" IE within the MBMS Session Stop Request?
posted Jul 31, 2014 by Ganesh

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The IE "time of MBMS data stop" is an optional element within the "MBMS Session Stop Request" . If it is present then MCE will update MCCH channel for all involved eNodeB's to synchronize them. And if it not there then MCE shall delete the radio resources along with MBMS context. Once MCE finishes the "MBMS Session Stop Procedure" it responds to MME by using the "MBMS Session Stop Response".

answer Aug 1, 2014 by Vimal Kumar Mishra
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How MCE behaves differently when it receives "Time of MBMS Data Transfer" (optional IE) along with "Minimum Time to MBMS Data Transfer" which is mandatory ? What signifies their presence in the MBMS SESSION START REQUEST message ?

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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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