How bearer binding mechanism work in Gn/Gp when BCM is UE_NETWORK?

Question

In Gn/Gp case when Bearer Command Mode is UE/Network. How it is decided that bearer binding will be done by PCEF or PCRF?

As both are possible in that case.

Answer 1

Long time I left LTE so I looked at the net (could not understand anything so just pasting) -

The Bearer Control Mode set to ‘UE-only’ means that the PCRF performs bearer binding The PCRF compare the TFT(s) of all IP-CAN bearers within an IP-CAN session with the generated PCC Rules waiting to be installed/modified or removed. The PCRF indicates to the PCEF the IP-CAN bearer within the IP-CAN session where the PCC Rules shall be installed or removed.

The Bearer Control Mode set to “NW-only” means that the PCEF performs bearer binding. The PCRF installs, modifies or removes PCC Rules over Gx interface to the PCEF. The PCEF checks if a bearer is established with the QCI and ARP indicated by the PCC Rule and associates these PCC Rules to the IP-CAN bearer that has the same QCI, ARP values.

Credit: http://www.google.co.in/patents/US**********

Comments

I guess this is very old one. There are 3 modes UE only, UE_NW and RESERVED

I just could not figure out how in UE_NW mode it is decided who will do the bearer binding as both PGW and PCRF can do the same

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Yes link is old :(
Lets wait if someone knows it.