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is it possible to segment the re-transmitting data?

+1 vote
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for suppose new transmission having 100RBs TB size and it got failure at UE and UE sends the NACK. For retransmitting same data, Due to its special subframe hence cant having 100RBS TB size (75RBs TB size available). In this case can we retransmit that data in special subframe?

If we retransmitted how original data of 100RBs UE can acquired?

posted Aug 10, 2016 by Suchakravarthi Sripathi

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2 Answers

+1 vote

Hi,

In HARQ level you cant do any segmentation, you have to transmit the same TB again. But In ARQ level if it is NACK then you can segment those packets and send it in available RBs. But it is recommended that you have to avoid re-transmission segmentation at RLC side.

answer Aug 10, 2016 by Jaganathan
Hi janardhan,  thanks for your answer.

Can you please provide me the specification reference which tells to avoid segmentation on retransmission data.
commented Aug 10, 2016 by Suchakravarthi Sripathi
+1 vote

Hi Suchi.,

Yes, It is Possible to segment the AMD PDU when Retransmitting the AMD PDU if the PDU does not fit the size indicated by lower layer.
Please refer the RLC specification 36.322 under section 5.2.1 Retransmission for further information its very clear.

answer Aug 11, 2016 by Hamesh Raja M A
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