4G/LTE - IP Allocation

  

 

 

 

IP Allocation

 

This page will explain the general procedure for IP allocation during the initial attach (1st PDN setup). IP allocation can be allocated anytime after the initial attach and the additional IP setting after the initial attach and IPv6 allocation will be described in separate page.

 

IP Allocation for UE

 

Direction

Message

Comment

UE -> NW

RRC : RRC Connection Setup Complete

+ NAS : Attach Request

+ ESM : PDN Connectivity Request

UE Request a PDN with specific IP type

UE <- NW

RRC : RRC Connection Reconfiguration

+ NAS : Attach Accept

+ NAS : Activate Default EPS Bearer Context Req

Network Allocate a sepcific IP to UE

 

< PDN Connectivity Request >

 

< Activate Default EPS Bearer Context Req >

 

 

IP Allocation for DNS

 

Direction

Message

Comment

UE -> NW

RRC : RRC Connection Setup Complete

+ NAS : Attach Request

+ ESM : PDN Connectivity Request

UE Request a DNS via PCO

UE <- NW

RRC : RRC Connection Reconfiguration

+ NAS : Attach Accept

+ NAS : Activate Default EPS Bearer Context Req

Network Allocate DNS IP via PCO

 

< PDN Connectivity Request >

 

 

< Activate Default EPS Bearer Context Req >