What is exactly PDCP UL Delay in LTE module?

[Binh Nguyen]

Hi everyone,
I did some experiment on LTE in which an UE sends Udp packets to an EnodeB and I got the UL PDCP delay in the UlPdcpStats.txt file, the RLC UL delay in the UlRlcStats.txt.
If I understand correctly, the UL Pdcp delay is the time a packet travels from UE's Pdcp layer to EnodeB's Pdcp layer. If so, then if I subtract the UL PDCP delay by the UL RLC delay, I will get the "processing" time of a packet between Pdcp layer and Rlc layer inside an UE (and EnodeB)?
Please let me know if I misunderstand something, because I got the UL PDCP delay significantly (hundreds times) larger than the UL RLC delay, and it doesn't seem correct.
Thanks!
Binh

[Nicola Baldo]

On Wednesday, January 30, 2013 1:36:05 AM UTC+1, Binh Nguyen wrote:

If I understand correctly, the UL Pdcp delay is the time a packet travels from UE's Pdcp layer to EnodeB's Pdcp layer. If so, then if I subtract the UL PDCP delay by the UL RLC delay, I will get the "processing" time of a packet between Pdcp layer and Rlc layer inside an UE (and EnodeB)?

Please let me know if I misunderstand something, because I got the UL PDCP delay significantly (hundreds times) larger than the UL RLC delay, and it doesn't seem correct.

RLC does buffering, segmentation and concatenation, which can cause the PDCP delay to be much larger than the RLC delay.