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Is it necessary to assign an ip address during the attach procedure ?

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Is it necessary to assign an ip address during the attach procedure ?
posted Jan 11, 2016 by Harshita

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1 Answer

+1 vote

LTE network supports always on IP connectivity. It means UE should have an IP address until it gets de-registered.
Attach is the procedure by which UE gets registered with MME/Network. I always saw an IP address assignment done by either PGW or MME and sends to UE on attach accept message.

answer Jan 12, 2016 by Vimal Kumar Mishra
+1. Just adding to Vimal's answer. As part of Attach Procedure, the UE sends an attach request. This request msg also contains a NAS pdu inside it which is nothing but the "PDN Connectivity Request" for the establishment of default bearer. PGW assigns the IP address and MME forwards it to the UE in the Attach accept msg.
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