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LTE: How SMS services will be received in LTE network ?

+1 vote

If a UE is connected to LTE network, can it receive SMS services too ? If yes then how it can be achieved ? How the signalling or SMS messages will flow between UE and Network ?

posted Sep 26, 2016 by Rupam

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1 Answer

0 votes

Hi rupam,

SMS and voice is mostly not implemented in LTE network. We know IMS is the one solution to handle voice and SMS, but to have IMS both network operator and UE has to support. So they introduced kind of CS fallback to handle SMS. For voice we know UE will fall back to CS network to recieve voice. For SMS UE will construct NAS ultransfer message and append the SMS data in it, then forwards to MME. Then MME gives that message to MSC then to actual destiantion. In DL SMS MSC will send SMS data to MME ,then MME constructs NAS DL-info transfer with SMS data then sends to UE thrugh ENB.

answer Sep 27, 2016 by Jaganathan
Similar Questions
+4 votes

Since SG-SMS messages are carried over the downlink NAS is it possible that a flood of SMS messages from the SMSC can deny services to users in the affected cells? The use case is associated with location-based SMS.

If a large number of SMS messages are sent to a targeted group of users within a cell is it possible that the NAS cannot serve requests to establish connections from the UEs? Is it possible to prioritize the information carried over the NAS or, failing that, to randomize the selection of which messages are sent so that SMS does not prevent other service requests from being processed?

+1 vote

We can identify two ways to operate SMS for PS-only network:

"SMS in MME" as elaborated in the TS 23.272 (Annex C) and the TS 29.338. It consists to a Diameter reference point (SGd) between the SMSC (IWF) and the MME

"SMS over IMS": As elaborated in the TS 23.204

I wonder why two different methods were designed.
In "SMS over IMS" the Short messages are transferred over the IMS PDN connection while in "SMS in MME", PDN connection is not mandatory.

Therefore, it seems that the "SMS in MME" replicates the existing SMS over CS that allow communication with the UE without the need of DATA channel.
The question is why the "SMS over IMS" is designed? Is it to cover the case of SMS without MSISDN?

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