The Low Rate Messaging Service (LRMS), specified in the present document, provides a means for the slow,
acknowledged or unacknowledged, transfer of multimedia message objects, including the Short Message
Service (SMS). It provides both point-to-point and point-to-multipoint messaging. This service may be used for private
and public roaming applications.
The present document defines the requirements on the Physical (PHY), Medium Access Control (MAC), Data Link
Control (DLC) and Network (NWK) layers of DECT. The present document also specifies management entity
requirements and generic interworking conventions, which ensure the efficient use of the DECT spectrum.
The present document further mandates how to implement a GSM like Short Message Service (SMS), Point-to-point
(PTP), which uses a sub-set of the Low Rate Messaging Service (LRMS) mentioned before as a bearer service.
SMS-PTP includes the following two services:
- SMS Mobile Originated (SMS-MO), for transport of short messages from PT to FT;
- SMS Mobile Terminated (SMS-MT), for transport of short messages from FT to PT.
Definition of Point-To-Multipoint (PTM) SMS is outside the scope of the present document.
In order to facilitate re-use of excising GSM Service Centres, the present document applies the upper GSM protocols
up-to and including the GSM SMS-RP protocol. Therefore, interworking functions handling the encapsulation of GSM
SMS-RP messages are specified.
Figure 1.1 shows the protocols defined in the present document.