Which LTE network node is responsible for allocating IP address to a specific terminal?

Question

I want to make a TCP server which accepts connection from the configured list of IPs.

Answer 1

PGW should aware about the UE IP since when IP packets come for an UE from the external network it should land at PGW so that the received IP packet can be encapsulated in GTP tunnel and forwarded to SGW. UE IP address can be allocated by PGW itself or using DHCP server/IP address pool.
In deployment different solutions are used compare to Proof of concepts/Simulators.

Comments

which node allocate the P-CSCF address to UE and in which message?