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Does LTE support SMS services or not and if yes then how?

+6 votes
Does LTE support SMS services or not and if yes then how?
posted Oct 4, 2014 by Kapil Kapoor

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1 Answer

+3 votes

LTE supports SMS over IP when using a VoLTE enabled network (with SRVCC) and Normal (2g/3g) sms when using CSFB (Using the SGs interface from MSC to MME)

answer Oct 4, 2014 by Saurabh Srivastava
Similar Questions
+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 ?

+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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