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IEEE 802 Update. Carl Kain, PE. September 12, 2012. IEEE 802 Topics of Interest to IEEE 1609 WG. Positive Train Control IEEE 802.15.4p attempt to use 5.9 GHz reserve channel New IEEE 802.11 GLK Study Group Use case for automotive Ethernet. Positive Train Control.

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IEEE 802 Update

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Ieee 802 update

IEEE 802 Update

Carl Kain, PE

September 12, 2012

Ieee 802 topics of interest to ieee 1609 wg

IEEE 802 Topics of Interest to IEEE 1609 WG

  • Positive Train Control

    • IEEE 802.15.4p attempt to use 5.9 GHz reserve channel

  • New IEEE 802.11 GLK Study Group

    • Use case for automotive Ethernet

Positive train control

Positive Train Control

  • The Rail Safety Improvement Act of 2008 (RISA08) mandates Class 1 railroads, certain classes of passenger rail, and railroads that carry Toxic Inhalation or Poison Inhalation (TIH/PIH) cargo are required to have certain categories of track instrumented with PTC by 2015

    • prevent train-to-train collisions and prevent derailments due to trains exceeding speed restrictions (braking is applied automatically if the cab crew ignores warnings)

    • prevent trains from improperly entering established work zones (the engineer in charge of a work zone can communicate directly with both the locomotive and the dispatcher)

    • prevent the movement of a train through a switch left in the wrong position (switch positions are transmitted directly to the locomotive and warnings are presented to the cab crew)

  • Congressionally mandated schedule is prompting railroads to use a proprietary communications system at 220 MHz

  • Several companies think this communication system will be inadequate in the long run

Typical positive train control system configuration

Typical Positive Train Control System Configuration

Ieee 802 15 4p ptc

IEEE 802.15.4p PTC

  • IEEE 802.15 created a task group to develop a standard for PTC

  • TG decided to use existing IEEE 802.15.4, and make PTC an amendment

  • Requirements for amendment include:

    • Operation in licensed or license-free radio bands

    • Operation up to 6 GHz; Specific bands of interest or bands in use today for similar systems: 216 – 222 MHz, 452/457 MHz, 896 - 902 MHz, 902 – 928 MHz, 928 – 952 MHz, 5850 – 5925 MHz

    • Depending on frequency band and operating rules, TX output power can be >+30dBm

    • Meets requirements at speeds up to 600 km/h

    • Range up to 70 km

    • Allows operation in contiguous or non-contiguous channel bandwidths as narrow as 5 kHz

    • supports data rates up to 1 Mbps with flexible and robust quality of service

Ieee 802 15 4p interest in 5850 5925 mhz band

IEEE 802.15.4p Interest in 5850-5925 MHz Band

  • Joint meeting between the PTC TG and the IEEE 802.18 Radio Regulatory TAG at IEEE 802 July Plenary

    • Lou Sanders of APTA was in attendance

  • The PTC TG made a presentation to include the use of the 5 MHz reserve frequencies in the DSRC band (channel 170)

    • The channel bandwidths for PTC use in this reserve band can be as small as 5 kHz

    • New frequency bands or modulations that are not currently in 802.15.4 (like the DSRC reserve channels) require an amendment to the IEEE 802.15.4 base standard

  • TG chair was told they would likely have to make a presentation to Julius Knapp and Jennifer Manner at FCC to discuss using DSRC band for PTC.

    • May be an impact from the NTIA study to examine unlicensed use of 5850-5925 MHz

Results of the joint meeting

Results of the Joint Meeting

  • TG chair (Jon Adams) wants to pursue (through the IEEE 802.18 Radio Regulatory TAG) requesting that DSRC Channel 170 (reserved) be used for IEEE 802.15.4-based PTC

  • Will likely be a discussion item at September Interim

  • TG presentations will be available at:

  • Noblis participates in TG due to TG interest in using DSRC spectrum, and implications to ITS safety applications for highway-rail intersections

Background on new ieee 802 11 glk study group

Background on New IEEE 802.11 GLK Study Group

  • IEEE 802.11 has a Wireless Next Generation Standing Committee that meets at each Plenary and Interim session

    • Presentations are solicited on new and emerging technologies or proposed new features

    • Presenters will often hold straw polls to determine if the group wants more information or additional presentations at the next meeting, or if there was sufficient interest to start a new IEEE 802.11 Study Group

    • Study Group status requires vote in closing plenary session

    • Study Groups are precursor to Task Groups

    • Task Groups develop new standards (amendments to IEEE 802.11)

  • At IEEE 802.11 WNG SC meeting at the July Plenary in San Diego, Don Eastlake gave a presentation titled “General 802.11 Links”

    • Don was the first of two TG Chairs of the Mesh Networking amendment

Presentation on using ieee 802 11 as general purpose communications link

Presentation on Using IEEE 802.11 as General Purpose Communications Link

  • One sample use case given was using IEEE 802.11 in vehicles instead of proprietary bus communications

    • The use of a wireless standard to access the vehicle area network would make it easy for the vehicle to communicate with repair equipment and diagnostic equipment

  • One solution to the use case is using Mesh technology (IEEE 802.11s).

  • A second alternative would be to extend the STA capability so they can operate as bridges

  • A third potential solution would be to hide the network behind a STA using network translation resulting in needing only one MAC address

    • One device would be seen to the outside world, but there would be a network (Dynamic Host Control Protocol (DHCP) served) behind the STA

Ieee 802 11 glk study group

IEEE 802.11 GLK Study Group

  • Study Group status was approved at July Plenary

  • Two teleconferences since the Plenary

    • Presentations made at teleconferences on issues and approaches to creating general purpose links

      • How to make link look transparent with AP in path

      • Differences between AP-AP links and AP-STA or bridged network links

      • Implications of adding bridging functions to STA

  • SG will have first face to face meeting at Palm Springs Interim on September 17-22

  • IEEE 802.1 participates in SG

  • Noblis participates in SG activity due to automotive use cases and general interest in Ethernet implementations in vehicles

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