top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What is FMS and BITMAP fields in PDCP status PDU?

+3 votes
1,224 views

This status PDU is it necessary in pdcp? if yes when it is required?

posted Oct 24, 2014 by Vasu

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

I believe you are talking about PDCP Status Report which has FMS and BITMAP -

FMS
PDCP SN of the first missing PDCP SDU

BITMAP
• The MSB of the first octet of the type "Bitmap" indicates whether or not the PDCP SDU with the SN (FMS + 1) modulo 4096 has been received and, optionally decompressed correctly.
• The LSB of the first octet of the type "Bitmap" indicates whether or not the PDCP SDU with the SN (FMS + 8) modulo 4096 has been received and, optionally decompressed correctly.

For more detail please look at http://www.eventhelix.com/lte/presentations/3GPP-LTE-PDCP.pdf

answer Oct 24, 2014 by Salil Agrawal
thank you salil agrawal
Similar Questions
+4 votes

Which factor derives this 7 bits or 12 bits long PDCP SN for PDCP data PDU carrying user data ?
Is it run time configurable for an UE ? or one time configuration.

+2 votes

I found 1st bit which is used to indicate that packet carrying Data/Control information. My question is that why first bit is used even packet itself known as "PDCP Data PDU".

0 votes

What is reordering and in-order delivery, out-of-order delivery in pdcp?

...