BSR reporting

Question

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

Answer 1

Hi,

If MAC has received 30 bytes of grant and UE will add 20 bytes of data and remaining bytes as padding of 0's or it would add BSR MAC CE with BSR index as 0 (In your case 10 bytes are remaining so it would be padding BSR because 10 is more than an short BSR).

Comments

Hi Thanks for replying :)
Just few questions:
1. because 10 is more than an short BSR, didn't understand this point, do you mean size of short bsr is less 10(in bytes)
2. What padding BSR contains ?

---

Yes short BSR is less than 10 bytes so UE will send padding BSR. 10 bytes is as per your example 20bytes of data but 30 byte grant so remaining 10 bytes.
padding BSR doesn't contain anything it is just an 0 padded in the end and different LC ID.