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What is padding BSR and why it is needed?

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What is padding BSR and why it is needed? How ever normal BSR also can carry same information but why do we need specific padding BSR?

posted Aug 3, 2017 by Dheerendra

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1 Answer

+2 votes

UE got the UL Grant and the padding data is larger than the size of BSR CE and the subheader (This is called Padding BSR).
There are somes cases where network send UL Grant when UE does not have any data to transmit, in this case UE transmit all 00 data or some garbage data and long padding 0s. In this situation, UE would put BSR MAC CE as part of MAC PDU and set BSR index value all 0. See one example here.

answer Dec 4, 2017 by Sushant Bose
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0 votes

Hi All,

I have a question related to BSR reporting, BSR trigger is very complicated

Suppose MAC has data of 20 bytes, but Grant received from network is 30 bytes, so will MAC send 20 bytes data + Padding BSR. or 10 bytes padding data,Because as far as i know, if Grant is enough to accommodate BSR as well, MAC will send BSR as well.

Please clarify this doubt.

Thanks
Sushant

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