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LTE MBMS: How many sub frames of a radio frame are used to transmit multi/broadcast data ?

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LTE MBMS: How many sub frames of a radio frame are used to transmit multi/broadcast data ?
posted Aug 10, 2014 by Ganesh

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1 Answer

+2 votes

Total 6 sub frames (Sub frame # 1,2,3, 6,7,8 ) of one radio frame are used to transmit multicast/broadcast data.

answer Aug 10, 2014 by Vimal Kumar Mishra
Hi Vimal, Is it mandatory to use all six sub frames always or It can be any number out of six ?
Hello Rupam,

SIB2 informs either one radio frame or four consecutive radio frames will be used by one particular MBSFN Area. Since one cell can support up to eight MBSFN Areas, SIB2 can carry up to eight such configuration.

Maximum six sub frames of a radio frame can be used to provide MBMS services. Therefore one radio frame uses six bits and four consecutive radio frames use twenty four bits. If bit is set "1" for a sub frame then this will be used for MBMS transmission else it won't be used.

In essence, a particular sub frame of a radio frame would be used for MBMS if the corresponding bit is set "1" in MBSFN-SubframeConfig IE.
Hope this answer would help you !!!
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