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1. Standards Impact
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The CMSAAC recommendations do not dictate on the transport technology to be used by
CMSPs to support CMAS. However, one of the requirements is to support roaming subscribers
using the same technology such as CDMA. In order to meet this requirement, it is important to
establish some common baseline and minimum requirements for the transport mechanism as well
as the CMAS application to be supported by all CDMA carriers electing to support CMAS.
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This VZW contribution covers the following areas:
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A. Recommending B-SMS over 1x Paging Channel as the transport mechanism for CDMA
to support CMA Text Profile.
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B. Mapping the CMAS “E” interface parameters to CDMA B-SMS parameters
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C. Mapping the CMA classes, categories, and eventCodes to Broadcast Service Categories
in TSB-58.
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D. [To be considered] Using features in C.S0005-B to save battery life
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1.1 CDMA Transport Mechanism for CMAS
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For the transport mechanism, although CDMA Standards include various broadcast options such
as B-SMS over 1x Paging Channel, B-SMS over BCCH, BCMCS, as a minimum requirement,
VZW recommends that CMAS be supported via B-SMS over 1x Paging Channel. The following
reference protocol stack should be adopted.
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“C”
“E”
“D”
CMA
Alert
CMA
CMA
AlertText
Text
SMDPP
SMDPP
Broadcast
Broadcast
SMS
SMS
Broadcast
Broadcast
HTTP?
HTTP?
IS-41
IS-41
1x
1xPaging
Paging
Channel
Channel
IPIP/ /VPN
VPN
SS7
SS7
CDMA
CDMAAir
Air
Interface
Interface
CCInterface
Interface
“XML”
“XML”
CAP
CAP
CMAS
Appl
CMA
Alert
AlertGW
GW
CMSP
CMSPGW
GW
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2
MSC
MSC
Base
BaseStation
Station
B-SMS
CDMA
CDMA
Device
Device
Figure 1 - CMAS Protocol Stack
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1.2 CMAS Application – Parameter Mapping
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For the CMAS application, VZW recommends that the parameter mapping from CMAS “E”
interface to CDMA B-SMS be considered. The entity to perform the parameter mapping should
be the CMSP GW (or Cell Broadcast Center).
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Table for element mapping:
“E” Interface Parameter Number of
Values
Length
CDMA B-SMS
Parameter (IS-637)
CMAE_protocol_version
1 octet
?
CMAE_identifier
2 octets
Msg_ID
1 octet
Service Category,
CMAE_alert_handling
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User Data
CMAE_language
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CMAE_char_set
1 octet
Msg_Encoding
CMAE_category
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1 octet
Service Category
CMAE_responseType
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1 octet
User Data
CMAE_urgency
2
Priority
User Data
1 octet
CMAE_severity
2
CMAE_certainty
2
CMAE_expires
8 octets
Validity (Absolute)
CMAE_Associated
multimedia indicator
2 octets
User Data
CMAE_CMSP defined
parameter
8 octets
User Data
CMAE_Reserved
2 octets
User Data
CMAE_Alert_Text_Length
1 octet
User Data
CMAE_Alert_Text
Up to 90
characters
User Data
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1.3 Broadcast Service Categories for CMAS
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The CMSAAC recommends that there are three classes of CMAs to be transmitted by CMSPs.
The classes of CMA shall be used by subscribers and mobile to opt out all but the Presidentiallevel alerts.
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a. Presidential-level
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b. Imminent threat to life and property
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c. Child Abduction Emergency
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The opt-out choice under the imminent threat to life and property will also be based on urgency,
severity and certainty. In addition, a set CMA categories and eventCode are defined to provide
additional information.
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The CMA classes, categories and eventCodes should be supported using the CDMA Broadcast
SMS Service Categories. VZW recommends the following broadcast service categories in TSB58 be assigned to support CMAS:
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Table 9.3.1.1 [TSB-58_G]:
Category
Description
CMA Class
0x0100
Presidential-Level Alert
0x0101
Child Abduction Emergency
0x0102
Imminent threat to life and property
CAP Category
0x0103
Met
0x0104
Safety
0x0105
Fire
0x0106
Geo
0x0107
Security
0x0108
Rescue
0x0109
Health
0x010A
Env
0x010B
Transport
CAP eventCode
0x0110
TOR
0x0111
VOW
0x0112
SVR
0x0113
EQW
0x0114
TSW
0x0115
BZW
0x0116
DSW
0x0117
FFW
0x0118
HWW
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0x0119
HUW
0x011A
TRW
0x011B
WSW
0x011C
CFW
0x011D
FLW
0x011E
FRW
0x011F
SMW
0x0120
AVW
0x0121
CDW
0x0122
CEM
0x0123
HMW
0x0124
LEW
0x0125
CAE
0x0126
NUW
0x0127
RHW
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2. [Optional capability – for further discussion]IS-2000 Rev C feature to save
battery life
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Currently VZW network and all devices support IS-2000 Rev 0. The cell broadcast SMS feature
defined in IS-2000 Rev 0 requires the mobile to monitor a separate paging slot for broadcast
message in addition to monitor its assigned paging slot for page and other messages. This will
degrade the standby time from 10% to 40% depend on the frequency of broadcast slots.
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In CDMA Standard C.S0005-B, there is a new feature introduced that could potentially reduce
the impact to device battery life by using broadcast indicators on the Quick Paging Channel. It
allows the mobile to monitor the broadcast indicators on the Quick Paging Channel instead of the
broadcast paging slot.
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Although this feature is standardized in C.S0005-B, VZW has no plan to deploy C.S0005-B at
this time. Our option is to work with our chipset vendors, device vendors and our infrastructure
vendors to borrow this feature and use it for IS-2000 Rev 0 mobiles.
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A. Request Qualcomm, device vendors and our infrastructure vendors to evaluate the
feasibility of implement this feature for IS-2000 Rev 0 mobile
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B. If it is a workable solution, then decide whether this should be a VZW only solution
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a. What’s the impact to legacy mobiles
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b. What’s the impact to roaming mobiles
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c. What’s the impact to our new devices roaming into the network that does not
support this feature?
C. If this should be an industry wide solution, then work with CDG on an Implementation
guide that would address the issue for interoperability testing and other issues.
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2.1 Broadcast Indicator on QPCH
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Here is a description of this feature according to the C.S0005-B standards:
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If the mobile station is operating in the slotted mode and it supports the Quick Paging
Channel, the Quick Paging Channel protocol provides for scheduling the transmission of
broadcast indicators for mobile stations in Quick Paging Channel broadcast slots. This
feature allows the mobile to stop monitoring the paging channel slot for broadcast message or
broadcast page. Instead, the mobile shall monitor the broadcast indicators on the Quick
Paging Channel 100 ms prior to the beginning of the Paging Channel broadcast slot.
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For the 2400 bps data rate Quick Paging Channel, there are a total of 4 broadcast indicators.
For 4800 bps data rate Quick Paging Channel, there are a total of 8 broadcast indicators.
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To support this feature, the base station shall support the following:
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1. Support two new fields in the “Extended System Parameters Message”
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a. QPCH_BI_SUPPORTED
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b. QPCH_POWER_LEVEL_BCAST
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2. When the base station sends a broadcast page using Periodic Broadcast Paging, the
base station should set all broadcast indicators to “ON” for the Quick Paging Channel
broadcast slot which begins 100 ms prior to the beginning of the Paging Channel slot
in which the message containing the broadcast page begins. At all other times, the
base station shall set all broadcast indicators for a Quick Paging Channel broadcast
slot to “OFF”.
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The mobile’s assigned Quick Paging Channel broadcast slots are offset from its Paging
Channel broadcast slots by 100ms. The devices shall support the Broadcast Indicator on the
Quick Paging Channel as specified in 3GPP2 C.S0005-B {Section 2.6.2.1.2.2}.
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1. The mobile station is operating in the slotted mode, is configured to receive broadcast
messages, supports the Quick Paging Channel, BCAST_INDEX is not equal “000”,
QPCH_SUPPORTED is equal to “1”, and QPCH_BI_SUPPORTED is equal to “1”,
the mobile station shall monitors broadcast indicators on the Quick Paging Channel.
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2. The mobile station shall check the broadcast paging slot for broadcast page or
broadcast message only if it determines that broadcast indicator bits are “ON”.
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