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

+6 votes
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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
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SMS for PS-only

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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