top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Roaming architecture of LTE?

0 votes
991 views

Can someone please explain Roaming architecture of LTE?

posted Jun 15, 2014 by Amit Kumar Pandey

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button
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

0 votes

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
Similar Questions
+1 vote
LTE: How does international roaming work ?

I want to know, how MME of roaming network (different country) gets the user profile from HSS (residing at different country) ?

0 votes
LTE: H-PCRF or V-PCRF which one imposes policy and charging rules for an UE roaming in visited PLMN ?

How the signalling messages flow between network nodes of inter PLMN ?
Assume a scenario, in which LTE UE is connected to its home network and handed over to another network due to mobility.

+3 votes
Which node CDRs are to be considered for LTE Roaming Scenario, in order to generate the TAP file

We consider the SGSN CDRs of Visited Network to generate the TAPOUT for GPRS ( 3G).

In case of LTE Roaming, which nodes CDRs are required and if multiple nodes CDRs are requires then do it requires the correlation as well.

+1 vote
Selection of Roaming operators by visiting network for the purpose of directing them to one particular SGW

What I know that the selection for the serving SGW is done through two main stages, the 1st stage is done through TAC values shared by the eNB's towards the MME while the 2nd stage is done through using the IMSI (MCC+MNC) of the user and according to that the DNS queries will be send to DNS server that will reply back with the serving SGW.

The logic that I am thinking of is correct? If this is the true then the MME should be able to build different tables to the different MCC/MNC's and thus, it will be dealt differently and through such tables I can configure one particular SGW to be served for some particular MCC/MNC's...

...