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LTE: Does the eNodeB inform UE to use a specific MCS for the allocated resource in PUSCH ?

+3 votes

EnodeB considers CQI feedback from the UE before creating the transport block.
As per my understanding PUCCH resource allocation is not very dynamic. In this case how UE decide to use a specific MCS (Modulation and Coding Scheme) while using PUCCH channel ?

posted Oct 13, 2016 by Harshita

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1 Answer

+1 vote

Hi ,

For contriol channels ENB will not convey any MCS because it is always QPSK modulation. Both ENB ENB and UE knows this info.

answer Oct 13, 2016 by Jaganathan
Would you please share the reference for the same ?

Refer this link for more info, there you can see BPSK for some pucch formats because it is HARQ report, LTE HARQ reports uses always BPSK. except this format all other PUCCH transmission used QPSK
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+4 votes

Actually there are three resource allocation types being used to allocate resources to UE(s) in downlink and uplink. For downlink all three (Type 0, 1 and 2) used but for uplink only resource allocation type 2 is being used.

0 votes

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 ?