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Why UL speed is always lesser than DL speed?

+3 votes
174 views

In any technology (GSM/CDMA/UMTS/LTE) UL speed is always lesser then DL speed.
why?

posted Apr 10, 2015 by Chirag Gangdev

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3 Answers

+4 votes
 
Best answer

Because UL data is from UE and power is main challenge at UE side, So UE is using only 1 transmitter. that's why UL data speed is lessor than DL data speed

answer Apr 10, 2015 by Deepak Jain
+1 vote

In addition to deepak answer:
In LTE Uplink is SCFDMA while downlink is OFDMA which is also a factor (only for LTE and WiMax)

answer Apr 10, 2015 by Salil Agrawal
+1 vote

Also most of the commercial UEs don't support MIMO in the uplink and higher order modulation in the uplink (64 QAM etc.) due to UE complexity and cost. Moreover, I don't know of any commercial handsets supporting DC-HSUPA yet and UL carrier aggregation for LTE. This results in lower speeds in the uplink compared to downlink.

answer Apr 11, 2015 by Faisal Adeem Siddiqui
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+1 vote

Why cant we configure more UL carriers than DL carriers? can anyone explain with valid reason?

+3 votes

Doubts related to 3G/UMTS - In DL we have 15 codes ,while in uplink direction we are using 2SF2 + 2SF4.
How the minimum spreading code is allocated in UL direction?

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