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LTE: How transport block size (TBS) is calculated for an UE (unicast) or group of UEs (multicast) ?

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In unicast mode, MCS is very dynamic in nature and depends on feedback from UE while in multicast or broadcast there is no feedback from UE then how a particular MCS index is chosen ? And is there any possibility when MCS for an already configured MBSFN can be updated ?

posted Nov 3, 2016 by Harshita

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2 Answers

+1 vote

Hi,

As you said in multicast ENB will not consider the single UE feedback, But ENb can take decision based on overall UE feedback(average). Yes ENB can change the MCS even if it is con figured before. It is left to MAC to select an MCS at run time.

answer Nov 3, 2016 by Jaganathan
+1 vote

Hi,

eNodeB have to consider overall channel condition of all UEs and selects medium level mcs (By averaging) which can be accepted by all UEs(cell center or edge). Noramlly for Broadcast Data eNB selects medium level MCS values due to retransmissions not possible for broadcast data.

answer Nov 3, 2016 by Suchakravarthi Sripathi
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