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Why flexible RLC and fixed RLC PDU have same data rate 14.4 Mbps and what is advantage of flexible RLC?

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Why flexible RLC and fixed RLC PDU have same data rate 14.4 Mbps and what is advantage of flexible RLC?
posted Sep 23, 2014 by Kumod

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1 Answer

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The RLC payload size is fixed to 40 bytes in Release 99 for Acknowledged Mode Data.
An additional configuration option to use an 80-byte RLC packet size was introduced in Release 5 to avoid extensive RLC protocol overhead, L2 processing and RLC transmission window stalling.

Sinc HSDPA+/HSUPA+ allow the optimization of the L2 operation since L1 retransmissions are used and the probability of L2 retransmissions is very low. So it is possible to use flexible and considerably larger RLC sizes and introduce segmentation to the Medium Access Control (MAC) layer in the base station.

I hope this should answer your second part of the question, now coming to first part why you think that datarate should be different, the purpose of flexible PDU was different (adding flexibility to avoid various overheads).

Check this article for more clarification
http://blog.3g4g.co.uk/2009/09/flexible-rlc-in-release-7-and-release-8.html

answer Sep 23, 2014 by Salil Agrawal
Similar Questions
+1 vote

In Rel 12 dual connectivity SENB doesn't support UL data path,then how UE will give RLC status PDU to SENB RLC for DL data transmission?

+1 vote

MAC notifies RLC of a transmission opportunity asking for data each TTI. So does RLC respond with multiple PDUs one for each UE (with different RLC SNs for each of the PDU). Or just sends down one PDU (with one RLC SN) having data of all the scheduled UEs?
This same question could be put this way too: Are the RLC SNs assigned independently for each UE or are they assigned by incrementing by 1 every TTI?

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