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What is the need of RLC UM mode in LTE?

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What is the need of RLC UM mode in LTE?
posted Nov 4, 2014 by anonymous

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2 Answers

+2 votes

RLC UM mode is not mandatory it is mandatory only when operator is supporting VoLTE. Please check TS 36.331 Table B.1-1.

answer Nov 4, 2014 by Salil Agrawal
+2 votes

Hi ,

The main reason for the RLC UM mode is, say e.g User is doing live buffering then there is no need of re transmitting the packets again and again. because it very time sensitive. so these kind of scenario ENB can use UM mode.

answer May 18, 2016 by Jaganathan
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RLC is one of the L2 layer in LTE radio protocol stack. It does many functions such as segmentation, re-assembling and along with that it supports various transmissions mode like transparent mode, acknowledgement mode and un-acknowledgement mode.
Now I want to understand for which type of RLC SDUs and PDUs transparent mode transmission is used.
Does the RLC create single RLC entity at cell level or at the UE level or at the bearer level ?

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