Monday, 23 February 2015

Static/Dynamic IP Address Allocation in LTE


I recently came across a discussion on how static and dynamic IP address are allocated in LTE for a UE. Luckily, there is a recent document from Netmanias that discussed this topic. The document is embedded below.



If you enjoyed reading the document (part 1) above, then there is a part 2 here. While in part 1, we saw that IP addresses can be either dynamic or static depending on their allocators, part 2 presents a specific case of IP address allocation – allocation in geographically-separated locations within an LTE network. In case of dynamic allocation, no matter where a user accesses, a dynamically selected P-GW dynamically allocates an IP address to the user for PDN connection. In case of static allocation, however, there is always one specific P-GW and one IP address for a user - the designated P-GW allocates a static IP address for the user’s PDN connection. A case study shows an LTE network that serves two cities as an example to describe different ways and procedures of IP address allocation, and see how they are different from each other.

3 comments:

Sébastien Grognuz said...

The first picture is not correct. The APN points on the P-Gw, not on the PDN.

Shailesh Chidrawar said...

What is triggering point from UE and eNB point of view w.r.t. static or dynamic IP address allocation?

Any advantage over dynamic IP?

Rahul jain said...

Dear Sébastien Grognuz,

Please explain what's the difference between APN and PDN in your comments.