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LTE: Why does uplink support only resource allocation type 2 ?

+4 votes
642 views

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.

posted Nov 7, 2013 by Vikram Singh

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1 Answer

+2 votes

Resource allocation type 2 is used for contiguous resource allocation.

In LTE uplink is SCFDMA and downlink is OFDMA. In SCFDMA , one needs to send all the data in contiguous fashion making it look like single carrier modulation. This decreases PAPR and hence reduces battery consumption (UE side battery).

answer Nov 7, 2013 by Salil Agrawal
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+5 votes

What calculation or logic behind to derive this 64 ?

+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 ?

+3 votes

I found that LTE supports up to 64 QAM modulation scheme . From where this limitation comes out ?

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