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Downlink Data rate is more than Uplink data rate

+2 votes

Hi everyone,
I m just a newbie and just wanted to know why Downlink Data rate is more than Uplink data rate

posted Aug 18, 2017 by Susanta Bose

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2 Answers

0 votes

Downlink uses OFDMA radio access mechanism while uplink uses SC-FDMA that is the main reason data throughput in less in uplink compare to downlink. There would be other factors also but as per my knowledge, radio access mechanism is the main reason for difference in throughput of DL and UL.

answer Aug 19, 2017 by Harshita
Thanks Harshita :)
0 votes

UL data rate is less because
1. UL prb allocation for pusch is less compare to DL pdsch allocation. In UL , ue need to have prb for pucch and rach .
2. In UL , ue transmit from one antenna only but in DL can receive from 2 antenna.
3. In UL 16/64 qam modulation is used while in DL 64/256 qam can be used.

answer Aug 20, 2017 by Veer Pal Singh Yadav
Thanks Veer
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+2 votes

This is not a usual case. Assume an eNodeB has multiple bearers (GBR and non-GBR) with the UE, eNodeB enforces subscribed downlink data rate by using the different scheduling algorithm. Can eNodeB reject the uplink grant assuming UE is crossing its subscribed limit ?

+1 vote

if you look into 5G BW it is huge than 4G why is that required,if you can achieve more data rate in less BW why do we need more BW in 5G

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