top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Why DSCP marking is required for IP packets at PGW ?

+1 vote
2,192 views

I read that when PGW's packet handler process maps an IP packet to a EPS bearer, it do DSCP marking.
And I also read DSCP marking is associated QCI of a bearer. How DSCP marking will help out to get maintained QoS of a bearer.

posted Oct 3, 2013 by Neeraj Mishra

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

1 Answer

+1 vote

There is 6 bits long field in IP header. It is used to make difference between IP packets so router can treat each packet differently. Router interprets DSCP and uses in its routing/scheduling algorithm. Since a number of application data is being carried out by IP layer. Every application want different type treatment (like delay sensitive) . To met such requirement DSCP is introduced.

IP world has done its job for their network but when data comes to LTE network at PGW. PGW has to take care so that IP packet meet such delay budget. That's why for downlink packets PGW check the DSCP of IP packet and send the packets to appropriate bearer. For that purpose LTE has defined QCI values.

answer Oct 3, 2013 by Vikram Singh
Similar Questions
+1 vote

Do we have DSCP marking (for prioritization of traffic) on the outer IP header (the one above GTP) and how do they look? What specification I can look into?

+3 votes

Is there any way to implement fast path for the data passing through PGW ?

+2 votes

How P GW will select the S GW for Incoming Packet?
Consider two conditions
1. UE is in idle mode.
2. UE is in ECM CONNECTED and ECM IDLE.

0 votes

As per LTE core network architecture, MME shares S11 interface with SGW and SGW has S5/S8 interface with PGW.
I went through Create Session Response message sent by SGW to MME and found PGW-C and PGW-U tunnel ids.
I want to know what MME does with these PGW-C and PGW-U tunnel Ids ?

...