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LTE: What all MCS indexes can be used for the configuration of PMCH ?

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Many values for the MCS index have been defined in the specification. Value ranges from 0 to 31.
Each MCS index values corresponds to different combination of "number of spatial streams + modulation type + Coding rate" .
In case of PDSCH resource allocation, eNodeB considers feedback from the UE but in case of PMCH where data is transmitted only at downlink. How a particular MCS index would be chosen for multimedia multicast broadcast data transmission ?
If I am correct, selection of MCS index is done at MCE and sends to eNodeBs/cells belong to the same MBSFN area ?
In this case when MCS index is selected by MCE, how MCE take decision on this factor ?
I am also looking for set of MCS index values which can be used for MBMS transmission ?

posted Oct 22, 2016 by Rupam

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1 Answer

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Hi rupam,

Its a implementation specific , You can have your own approach while scheduling MBSFN. Like if you want to over all Users then select the user who has low MCS then use the same for all users. If you want to make sure spectral efficiency then select the highest MCS and use it for all users.

answer Oct 24, 2016 by Jaganathan
Best suitable method is As we cant assure higher modulation levels like 64-QAM for broadcast services. Selecting MCS support for QPSK or 16-QAM modulation type is desirable.
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