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Communications Technology Group. Status Report to the Commercial Mobile Service Alert Advisory Committee May 16, 2007 Brian K. Daly, CTG Leader. CTG Mission.

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communications technology group

Communications Technology Group

Status Report to the Commercial Mobile Service Alert Advisory Committee

May 16, 2007

Brian K. Daly, CTG Leader

ctg mission
CTG Mission
  • The primary mission of the Communications Technology Group (CTG) is to develop and submit recommendations for relevant technical standards for devices and equipment and technologies used by electing commercial mobile service (CMS) providers to transmit emergency alerts to subscribers (see WARN Act §603(c)(3)). Furthermore, per WARN Act §603(c)(6), the CTG will develop recommendations for a process under which CMS providers can elect to transmit emergency alerts if:
    • A) not all of the devices or equipment used by such provider are capable of receiving such alerts or;
    • B) the provider cannot offer such alerts throughout the entirety of its service area.
  • Furthermore, the CTG will support development of technical standards for priority transmission of alerts by electing CMS providers to subscribers (WARN Act 603(c)(2)).
  • Finally, the CTG will support the development of recommendations for the technical capability to transmit emergency alerts by electing CMS providers to subscribers in languages in addition to English, to the extent feasible and practicable. See WARN Act §603(c)(4)).


status ctg issues to address
Status - CTG Issues to Address
  • 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 is defining Service Profiles which prescribe the underlying delivery attributes
    • Goal is 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 Interface or Gateway
  • 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.
    • CTG has developed working assumptions on geo-targeting to be presented in this briefing


status ctg issues to address1
Status - CTG Issues to Address
  • Recommendations on handset and device technologies appropriate for alerting services – First reported in March.
    • CTG Device Ad Hoc is addressing key issues surrounding the handset and device technologies
  • The needs of non-English subscribers as well as people with special needs, including people with disabilities and the elderly.
    • CTG is addressing issues surrounding the support of multi-languages; further details provided in this briefing


status ctg issues to address2
Status - CTG Issues to Address
  • 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.
    • CTG is in the process of defining service profiles for audio, video, and multimedia for broadband multimedia networks of the future
  • 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


ctg status
CTG Status
  • Monthly multi-day face-to-face meetings with interim conference calls
    • Since last report, held 2 face-to-face meetings and 3 conference calls
  • First draft of CTG Requirements & Architecture document has been developed by the CTG for internal review
  • Coordinating with the other working groups
    • Liaisons being sent to other working groups
  • On track for making recommendations to the Project Management Group per the project schedule and assignment of responsibilities


ctg participants
CTG Participants
  • Substantial work effort with over 30 CMSAAC delegates and subject matter experts:
    • Cingular (Leader)
    • Sprint-Nextel (Deputy Leader)
    • Alltel
    • American Association of Paging Carriers
    • Rural Cellular Association
    • T-Mobile
    • Verizon
    • Ericsson
    • Motorola
    • Nokia
    • Nortel
    • Qualcomm


project timelines milestones
Next 3 months

Complete service profile definitions

Address special needs requirements

Address battery life issues

Define recommendations for handset and device technologies

Complete gateway to wireless interface definition

Finalize use cases

Address UNG comments to handset and device technologies

Address OAM&P recommendations

Evaluate security requirements

Define technology evolution path to multimedia and broadband

Address alignment with standards


All technical issues resolved

Final delivery of CTG requirements to the PMG


Address final comments from all working groups

Project Timelines & Milestones


service profiles
Service Profiles
  • The CTG is continuing the process of defining service profiles
    • Service Profiles define the underlying delivery attributes
      • Include text, audio, video, and multimedia
    • Text is underlying “common denominator” service profile
    • Defined Audio service profile and underlying working assumptions for future multimedia broadcast technologies
      • Work on video & multimedia service profiles in progress


draft conclusions for audio video multimedia
Draft Conclusions for Audio, Video & Multimedia
  • The CMAS service profiles for text, audio, video, and multimedia messages are for the transmission of text data, audio files, video files, and multimedia files and not for the presentation of real-time content
    • Sending audio files (e.g. wav files) via cell broadcast is not efficient, practical, or feasible.
      • In the future, more advanced multimedia broadcast technologies for mobile devices may provide the capabilities to support audio based alerts


draft conclusions for audio video multimedia1
Draft Conclusions for Audio, Video & Multimedia
  • Alignment is necessary between alert origination capabilities and CMAS capabilities:
    • CMAS is not capable of providing the real-time audio broadcast of a Presidential alert
    • Presidential alerts could be delivered over CMAS using text-based messaging.


draft conclusions for audio video multimedia2
Draft Conclusions for Audio, Video & Multimedia
  • The Alerting Gateway is responsible for collecting and assembling all text, audio, video, and multimedia components of the CMAS messages to be given to the wireless operators for transmission
    • If the CAP includes a Resource Element that includes an URI, it is not expected that the wireless service provider will be required to retrieve the file specified by the URI
      • The Alerting Gateway will retrieve the associated file during the collection and assembly process for the CMAS alert message and deliver it to the wireless service provider
    • Any audio, video, and multimedia files collected for the CMAS alert messages must be provided to the wireless service provider in a standard set of formats which are to be jointly defined by the CTG and AGG
    • Transcoding and transmission of audio, video, or multimedia files into the formats supported by the mobile devices is the responsibility of the Wireless Service Provider Gateway and/or the Wireless Service Provider Infrastructure


battery life concerns
Battery Life Concerns
  • Mobile device & battery technology has progressed to provide significant standby and talk times for mobile devices
  • Subscribers expectations are set
  • Technologies which provide broadcast capability may have an impact on these expectations


battery life concerns1
Battery Life Concerns
  • ETSI TR 102 444 V1.1.1 (2006-02), Analysis of the Short Message Service (SMS) and Cell Broadcast Service (CBS) for Emergency Messaging applications
    • “A MS (i.e., handset) normally has to be specifically enabled by the subscriber to receive CBS messages. Once enabled, mobile manufacturer'sreport a considerable drain on battery life, although there are techniques in the specifications (DRX) to reduce this problem. Concerns have been raised by mobile manufacturers on the effectiveness of DRX, as any enabling of CBS, with or without DRX can reduce the "talk time" of their products, which is a key marketing differentiator. For this reason, MS's (i.e. handsets) are normally shipped with the Cell Broadcast feature switched off.”


battery life concerns2
Battery Life Concerns
  • June 3rd 2004 the following statement from the GSM Association (GSMA) to 3GPP T2 working group on mobile devices
    • “…..When cell broadcast monitoring of a channel is enabled, there is significant battery drain on the terminal device, as it continually monitors for incoming CB pages on that channel. For some handsets this can reduce the standby time by up to 50%. (This is especially inefficient if the page data on the channel never changes or is seldom changed) …..”


battery life concerns3
Battery Life Concerns
  • In addition, CMAS parameters impact battery life
    • Number of languages (open issue to be addressed)
    • Number of unique messages
    • Number of retransmissions
    • Duration of Audio Alert Tone and/or Vibration on mobile device
    • Additional handset and system capabilities to support CMA


ctg steps to address battery life concerns
CTG Steps to Address Battery Life Concerns
  • Review the existing studies and determine if they are still valid and applicable to CMAS
    • Also identify if any similar studies are available for CDMA and paging technologies
  • Evaluate battery life impact of user needs requirements
    • E.g. battery life impacts to flashing and/or vibrating the devices every few minutes when an alert is received
  • Understand the estimated frequency of CMAS alerts and how this impacts battery life


steps to address battery life concerns continued
Steps to Address Battery Life Concerns (continued)
  • CTG-member mobile device manufacturers and wireless operators asked to provide an analysis of the impacts of CMAS to mobile device battery life and identify any mechanisms to minimize impact to battery life (e.g., DRX in GSM)
  • Investigate impacts to mobile device battery life from any trials or deployments of the technology, either commercially or for an alerting service
  • Investigate using the Idaho National Lab Wireless Testbed to evaluate the battery life issue under various alerting scenarios


geo targeting draft conclusions
Geo-targeting Draft Conclusions
  • The minimum precision for geo-targeted geography for CMA will be the county
    • A Service Provider may elect to target smaller areas if they chose and the technology supports it, but it will not be required
  • The Service Provider is not required to dynamically match alert geography to RF coverage areas
  • A Service Provider shall not be required to divulge cell site information, coverage information, or any RF properties of their respective networks
    • The Service Provider shall be the sole agent responsible for determining which network facilities, elements, or locations are involved in transmitting a CMA to a mobile device
  • A Service Provider could use either (or both) the latitude/longitude coordinates (e.g. circle or polygon) or the FIPS Codes or equivalent over reference point “C”
    • Expectation is both will be provided


draft conclusions for alerting
Draft Conclusions for Alerting
  • Alert Type
    • Audio
      • Single Unique Audio Tone defined for all CMA message types
      • Limited by audio safety limits
    • Vibration Motor
      • Suggested – Single Unique Vibration cadence for all CMA message types for devices that can support vibration cadences
        • Not all handsets support vibration patterns
      • Force of vibration limited by hardware (including size)
  • Incoming CMA will not Override Personal Audio/Vibration Settings on the Mobile Device
    • CMA will follow the profile settings
      • E.g. if user sets mobile device in Vibrate or Silent mode, the Unique CMA Audio Tone will not override that setting


language support
Language Support
  • CTG is evaluating feasibility and practicality of supporting languages in addition to English
    • Fundamental technical problems to reliably implement languages in addition to English
    • Alert source must provide CMA message in language(s) other than English if CMA recommendation is to support multi-languages
      • Service providers will not be responsible for language translations
    • Additional languages increases the cost and complexity in the handset and in the network
    • Mobile Device may have character set limitations
    • Additional Character sets limit the amount of data that can be transmitted
      • For example, some character sets take 2 Bytes per character versus 1 Byte per character  70 characters is now 35 characters


language support continued
Language Support (continued)
  • Fundamental question: How many languages other than English are feasible and practical for CMA?
    • On a National basis, only Spanish exceeds 1% of households*
    • On a local basis, there are potentially more than 37 languages that exceed 1% of households*
      • Would required >16 different character sets to be supported in the mobile device

* Per 2000 U.S. Census data


language support continued1

Fixed Number of Alerts Supported

Language Support (continued)
  • Radio Resource Limitations
    • Text service profile is limited to approximately 70 characters
    • Each alert may be retransmitted
      • Reducing the number of Alerts supported
    • Multiple Alerts Types may occur simultaneously
      • Reducing the number of Alerts supported
    • Each added language will proportionally decrease the number of Alerts supported

CTG Is Evaluating Support for Spanish as a 2nd Language for CMA


  • Several key issues are being addressed, including
    • Battery Life
    • Multi-language
  • CTG is working well with other CMSAAC working groups
  • CTG is on track for providing recommendations to the PMG by August, 2007