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Roaming architecture of LTE?

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Can someone please explain Roaming architecture of LTE?

posted Jun 15, 2014 by Amit Kumar Pandey

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I answered the query as per my knowledge but still I have a related query.

How PGW selection occur when a UE switches on visited network ?
Would PGW be from the home network or visited network ?
commented Jun 22, 2014 by Rupam
May a classic case of having an article on Roaming
commented Jun 22, 2014 by Salil Agrawal

1 Answer

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An UE can reach to visited network through following two procedures:
1. Switch on at visited network.
2. Handover to visited network.

When UE switches on at visited network, it sends attach request message to visited network's MME.
After receiving attach request message, MME contacts to UE's home network PLMN and proceed further to complete attach procedure.

Similarly for handover procedure, when due to UE mobility and home network coverage, UE gets handed over to visited network. Traffic is still routed through home PGW and visited network SGW.

answer Jun 22, 2014 by Rupam
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