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

Question

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.

Answer 1

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).