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LTE: What type of data is considered for transparent mode (TM) transmission in LTE RLC ?

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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 ?

posted Oct 1, 2016 by Rupam

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2 Answers

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RLC layer support three mode of transmission in LTE radio stack. These three modes are transparent mode (TM), un-acknowledge mode (UM) and acknowledge mode (AM). In case of transparent mode, RLC layer does not put any header. It does not apply segmentation and re-assembling for RLC SDUs.

BCCH/PCCH/CCCH logical channels information is carried out using the transparent mode.

answer Oct 2, 2016 by Harshita
0 votes

Hi rupam,

RLC entity is per LC basis. Each LC will have one entity. As harshitha said BCCH/PCCH/CCCH will be TM mode. Remaining LC's base on OAM(operator) configuration ENB will select the operation mode.

answer Oct 3, 2016 by Jaganathan
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