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How PRBs (110 PRBS in 20MHZ BW) in physical layer level mapped to RBs (100 RBs in 20MHZ BW) in mac level?

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How PRBs (110 PRBS in 20MHZ BW) in physical layer level mapped to RBs (100 RBs in 20MHZ BW) in mac level?
posted May 2, 2016 by Suchakravarthi Sripathi

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1 Answer

+6 votes

MAC layer allocates the multiple contiguous RBs, but there is no guarantee that they are aligned contiguously when they get transmitted at PHY layer. It means that there should be a some rule to convert this logical/virtual RB allocation in MAC to PRB allocation in PHY.

There are two type of the conversion, one is Localized and the other is Distributed.
- Localized when both virtual allocation and physical allocation are mapped one to one.
- Distributed, when the VRB allocation is contiguous, but PRB allocation is not contiguous. It means that , PRBs may get distributed over wider frequency ranges because there is high possibility that you may not find contiguous PRBs throughout your bandwidth.

I hope it helps !!

answer May 4, 2016 by Bhaskar Kalaria
How UE will come to know whether it is continuous allocation or dis continuous allocation
UE knows because UE is being updated with DCI information
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