Communications Technology Group (CTG) Status Report to the Commercial Mobile Service Alert Advisory...
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Transcript of Communications Technology Group (CTG) Status Report to the Commercial Mobile Service Alert Advisory...
Communications Technology Group(CTG)
Status Report to the Commercial Mobile Service Alert Advisory Committee
September 19, 2007Brian K. Daly, CTG Leader
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CTG – Communications Technology Group
Status - CTG Issues Addressed Recommendations for technologies and methods permitting
the efficient transmission of messages to potentially the entire subscriber base of an operator – First reported in March: The CTG has defined Service Profiles which prescribe the
underlying delivery attributes Text and future streaming audio, streaming video & multimedia Text is the minimum requirement for CMAS
Goal has been to define service profiles and not specific delivery technologies
If an Operator elects to transmit alerts they should have the option to use any available technology that supports a given profile
Permit the distribution of alerts with the appropriate priorities as indicated by the AIG. Messages will be delivered in the order received; prioritization
and sequencing to be performed at the Alert Gateway
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CTG – Communications Technology Group
Status - CTG Issues Addressed Recommendations on methods permitting the targeting of alerts to
specific geographic regions or locales, thereby enabling use of this important emergency service by other alerting authorities, including state and local governments. Geo-targeting will be on a county basis
More information later this briefing Recommendations on handset and device technologies appropriate
for alerting services – First reported in March. Several draft conclusions have been presented
The needs of non-English subscribers as well as people with special needs, including people with disabilities and the elderly. Provision has been made in the CMAS architecture to support multi-languages
C-Interface designed with language indicators and character encoding to support multiple languages
CMA message must be delivered to the CMSP in the language that it is to be delivered
A national plan for multiple languages needs to be developed by the government
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CTG – Communications Technology Group
Status - CTG Issues Addressed To ensure that this critical emergency service continues to
evolve with technology supporting it, the CTG should also consider recommendations permitting the incorporation of planned service improvements, such as expected multimedia and broadband services, into their CMS alerting capability – First reported in March. Service profiles defined for future streaming audio, streaming
video, and multimedia for future broadband multimedia networks
The CTG will develop recommendations to facilitate eventual alignment of the Advisory Committee’s recommendations with relevant standards organizations focused on the development of mobile communication standards to support its continued evolution and adaptation. Standards recommendations will be provided after all
technology recommendations are known
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CTG – Communications Technology Group
CTG Status Completed CTG conclusions for all
outstanding technical issues Monthly multi-day face-to-face meetings with
interim conference calls Since July 1, held 16 multi-hour conference
calls Coordinating with the other working groups
Held joint meetings with the AIG, AGG and the UNG
CTG provided significant input into the 3rd draft of the CMAS Architecture & Recommendations document
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CTG – Communications Technology Group
CTG Statistics (Totals)
As of July 1st Current
Number of Assigned Doc Numbers
258 316
Total Number of Docs including Revisions
448 622
Number of Liaison Docs 25 25
Number of Action Items 34 35
Total Number of Face-to-Face Meetings & Days
6 meetings over 15 days 7 meetings over 18 days
Total Number of Conference Calls of CTG & Ad-Hocs
25 41
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CTG – Communications Technology Group
Geo-targeting As previously reported, the minimum geo-targeted
geography for CMAS alerts generally should be the county Some wireless technology RF propagation areas, for systems
such as paging systems or multi-county cell sites, may greatly exceed a single county
CMSP may elect to target smaller areas CMSP may elect to target CMAM for distributions to predefined
alert areas smaller than a county (e.g. city, metro areas) and may use GNIS codes, polygon, or circle information to identify a predefined list of cell sites / paging transceivers within the alert area
It is desired that more flexible geo-targeting to alert areas evolve as technology advances
CMSP should not be required to dynamically match alert geography to RF coverage areas due to technology limitations within the CMSP networks
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CTG – Communications Technology Group
Audio Attention Signal Public is familiar with the “EAS” Alert Signal from
Radio and Television Two tone combination of 853Hz and 960Hz sine
waves Similar signal will be approximated on mobile devices
Polyphonic devices use two tone signal as above Single tone (< 2.5 kHz) used for devices not capable
of polyphonic tones 8-10 second duration Temporal pattern if device is capable
Approximately 2 seconds on, ½ second off, 1 second on, ½ second off, 1 second on repeated twice
Audio attention signal will not be available for any other use
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CTG – Communications Technology Group
Vibration Cadence
Vibration cadence for the CMAS alert signal should be noticeably different from the default cadence of the mobile device
Should be similar to the temporal pattern of the audio attention signal Approximate the 2 second vibration
followed by two 1-second vibrations with a ½ second gap between each
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CTG – Communications Technology Group
Battery Life CTG analysis confirmed that battery life is a
potential issue with cell broadcast Each technology implements text broadcast
messaging differently Each technology is deployed with different
hardware and software, as well as, different standards releases
The battery life impact of CMAS on a state of the art deployment of infrastructure and portable devices targeting optimized battery life could be as high as 40% or more Confirming other industry reports
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CTG – Communications Technology Group
Battery Life (continued) The impact to mobile device battery life can be
managed by the CMSP through careful selection of the following parameters: Initial system network parameters before
implementation of broadcast messaging Practical latency to deliver the message over the E
interface Retransmission interval Number of times the portable device alerts the user
Factors outside the CMSP control impacting battery life include: Number of languages supported Number of alerts sent Alert Duration
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CTG – Communications Technology Group
Battery Life (continued) With modifications to network
infrastructure, mobile devices and/or standards, and proper selection of the criteria on the previous slide, the reduction of battery life due monitoring the Cell Broadcast channel without sending alerts messages can be less than 10% of today’s capability To design and deploy a system with the
performance described above, modifications to the portable devices, network infrastructure and/or standards are required
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CTG – Communications Technology Group
Battery Life CTG Conclusions Battery Life is dependent upon number of
alert messages transmitted Recommend that government Alert Aggregator
support a policy of ensuring that the aggregate CMAM rate does not adversely impact mobile device battery life
The CMSPs should give consideration to modifications to network infrastructure, mobile devices and/or standards, and to the proper selection of the criteria on the previous slide, in order to limit the reduction of battery life
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CTG – Communications Technology Group
“C” Reference Point Protocol for the “C”
reference point has been defined XML-based
Mapping of message from CAP to “C” reference point to “E” reference point has been completed
CMAC_Alert_Info
CMAC_categoryCMAC_event_code (optional)
CMAC_response_type (optional)CMAC_severityCMAC_urgencyCMAC_certainty
CMAC_expires_date_timeCMAC_sender_name (optional)
CMAC_text_languageCMAC_text_encoding
CMAC_text_alert_message_lengthCMAC_text_alert_message
CMAC_web (future)
CMAC_Resource
CMAC_resource_description (future)
CMAC_mime_type (future)CMAC_resource_size (future)CMAC_resource_uri (future)
CMAC_resource_digest (future)
CMAC_Alert_Area
CMAC_area_descriptionCMAC_polygon (optional)
CMAC_circle (optional)CMAC_cmas_geocodeCMAC_gnis (optional)
CMAC_Alert_Attributes
CMAC_protocol_versionCMAC_sending_alert_gateway_id
CMAC_message_identifierCMAC_referenced_message_identifier
(optional)CMAC_special_handling
CMAC_senderCMAC_sent_date_time
CMAC_statusCMAC_message_typeCMAC_note (optional)
CMAC_original_cap_alert_uri
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CTG – Communications Technology Group
“C” Reference Point
Alert GatewayOptional CAP Elements
notereferenceslanguage
responseTypeaudienceeventCode
expiresheadlinedescriptioninstructionweb
parameterresourceDesc
mimeTypesizeuri
derefUridigest
polygoncircle
geocode
Mandatory CAP Elements
identifiersender
sentstatus
msgTypecategoryurgencyseverityCertainty
eventareaDesc
Data
“C” Reference Point Elements
CMAC_protocol_versionCMSP_sending_alert_gateway_id
CMAC_message_identifierCMAC_referenced_message_identifier (optional)
CMAC_special_handlingCMAC_sender
CMAC_sent_date_timeCMAC_status
CMAC_message_typeCMAC_note (optional)
CMAC_original_cap_alert_uriCMAC_category
CMAC_event_codeCMAC_response_type (optional)
CMAC_severityCMAC_urgencyCMAC_certainty
CMAC_expires_date_timeCMAC_sender_name (optional)
CMAC_text_languageCMAC_text_encoding
CMAC_text_alert_message_lengthCMAC_text_alert_message
CMAC_web (future)CMAC_area_description
CMAC_polygon (optional)CMAC_circle (optional)CMAC_cmas_geocodeCMAC_gnis (optional)
CMAC_resource_description (future)CMAC_mime_type (future)
CMAC_resource_size (future)CMAC_resource_uri (future)
CMAC_resource_digest (future)
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CTG – Communications Technology Group
Summary
The CTG has successfully completed the task as defined in the initial CMSAAC meeting December 2006
The CTG Chair wishes to thank each member of the CTG (and the CMSAAC) for their dedication and hard work.