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Broadcast Service for the broadcast of CMAS messages. The standard includes the mapping of CMAS
application level messages to the Cell Broadcast Service message structure.
The ATIS WTSC-G3GSN Subcommittee is developing the Cell Broadcast Entity (CBE) to Cell Broadcast
Center (CBC) Interface Specification. 141 The purpose of this standard is to define a standard XML-based
interface to the CBC. The CMSP Alert GW will utilize this interface to provide the CMAS Alert message
information to the CBC for broadcast via CBS.
The ATIS WTSC-G3GSN Subcommittee has developed the Implementation Guidelines and Best
Practices for GSM-UMTS Cell Broadcast Service Specification 142 and this specification was approved in
October 2009. The purpose of this specification is to describe implementation guidelines and best
practices related to GSM-UMTS Cell Broadcast Service regardless of the application using CBS. This
specification is not intended to describe an end-to-end Cell Broadcast architecture, but includes
clarifications to the existing 3GPP CBS standards as well as “best practices” for implementation of the
3GPP standards. CMAS is an example of an application that uses CBS.
J-STD-100, Joint ATIS/TIA CMAS Mobile Device Behavior Specification, 143 defines the common set of
requirements for GSM, UMTS, and CDMA based mobile devices behavior whenever a CMAS alert
message is received and processed. A common set of requirements will allow for a consistent user
experience regardless of the associated wireless technology of the mobile device. Additionally, this
common set of requirements will allow the various local, state, and Federal level government agencies to
develop subscriber CMAS educational information that is independent of the wireless technology.
B.2.2.1 CMAS VIA LTE/EPS
In order to comply with FCC requirements for CMAS, CMSPs have a need for standards development to
support CMAS over LTE/EPS as it relates to the network-user interface generally described as the “E-
Interface” in the CMAS Reference Architecture. The intent of ATIS WTSC-G3GSN is to build upon LTE
text broadcast capabilities currently being specified by 3GPP for the Public Warning System (PWS).
3GPP TS 22.268
3GPP TS 22.268. Public Warning System (PWS) Requirements covers the core requirements for the
PWS and covers additional subsystem requirements for the Earthquake and Tsunami Warning System
(ETWS) and for CMAS. TS 22.268 specifies general requirements for the broadcast of Warning
Notifications to broadcast to a Notification Area that is based on the geographical information as specified
by the Warning Notification Provider. This specification also defines specific CMAS requirements based
on the three Reports & Orders issued to date by the FCC.
3GPP TS 23.401. GPRS enhancements for E-UTRAN access, specifies the Warning System Architecture
for 3GPP accesses and the reference point between the CBC and Mobility Management Entity (MME) for
warning message delivery and control functions. This TS identifies the MME functions for warning
message transfer (including selection of appropriate eNodeB), and provides Stage 2 information flows for
warning message delivery and warning message cancel. The architecture and warning message delivery
and control functions support CMAS.
141 ATIS-0700008, ATIS Cell Broadcast Entity (CBE) to Cell Broadcast Center (CBC) Interface Specification.
142 ATIS-0700007, Implementation Guidelines and Best Practices for GSM/UMTS Cell Broadcast Service Specification.
143 J-STD-100, Joint ATIS/TIA CMAS Mobile Device Behavior Specification, 30 January, 2009 and is available from the Alliance for
Telecommunications Industry Solutions (ATIS) .
www.4gamericas.org February 2011 Page 118