How token Bucket Alogorithm is applied to the logical channels of MAC layer in LTE?

Question

What could be the reason for defining logical channel grouping concept in LTE ? Why logical channels can't be used independently ?

Answer 1

Hi,

In simple terms, Each LC will have PBR value configured by upper layer. After getting grant form ENB MAC, UE scheduler will pick each LC based on decreasing priority and serve only PBR bytes. after serving PBR of all LC if remaining grant is there menas UE can serve all data remainig in the high priority LC.

Comments

But there is a concept of BucketSizeDuration also... What is it?

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BSD is the timer which says how much time UE can buffer the data in that particular LC.
For e.g max_size = BSD * PBR --> UE can buffer max_size bytes of data to apply LCP. If it buffered data exceeds this size then no LCP will be applied, this LC will get highest priority than all.

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can you give reference material for this.

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refer the following link

http://lteexpert.blogspot.in/2014/10/how-multiplexing-and-logical-channel.html