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September 2008 Chicago, IL John Moring

September 2008 Chicago, IL John Moring. Status 1609.0 1609.3 1609.4 1609.5. WAVE System Components. IETF : Internet Engineering Task Force LLC : Logical Link Control MAC : Medium Access Control MLME : MAC Layer Management Entity PHY : Physical Layer

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September 2008 Chicago, IL John Moring

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  1. September 2008Chicago, ILJohn Moring Status 1609.0 1609.3 1609.4 1609.5

  2. WAVE System Components

  3. IETF: Internet Engineering Task Force • LLC: Logical Link Control • MAC: Medium Access Control • MLME: MAC Layer Management Entity • PHY: Physical Layer • PLME: Physical Layer Management Entity • WME: WAVE Management Entity • WSMP: WAVE Short Message Protocol Protocol Stack 1609.1, et al. IETF 1609.3 1609.3 802.2 1609.4 802.11p 802.11p

  4. Trial Use WAVE Standards Scope of this discussion

  5. The Standards • Draft P802.11p: Amendment : Wireless Access in Vehicular Environments (WAVE) • Defines the lower layers (PHY and MAC) of the communications stack as deltas to 802.11 • IEEE Std 1609.4™-2007: Trial-Use Standard for WAVE - Multi-Channel Operation • Provides frequency band coordination and management within the MAC layer • IEEE Std 1609.3™-2007: Trial-Use Standard for WAVE - Networking Services • Specifies operation and management of the communications stack Work has begun in developing Full-Use versions • With lessons learned from product development and field trials • Full Use standards will include • 1609.0 WAVE Architecture (existing draft addresses Trial Use) • 1609.5 WAVE Communications Manager • Program authorization request submitted to IEEE, contents in early discussion

  6. System Objectives • Leverage existing technology • E.g., 802.11 • Future-proof technology • E.g., IPv6 • Account for freeway-speed units • Short and intermittent mobile-roadside connectivity • Provide mobile-mobile as well as mobile-roadside communication • Support a range of traffic types including high priority/low latency and general Internet • Provide security • More later

  7. P802.11p • Amendment to 802.11 • Nearing finalization as of Sept ‘08 • IEEE P802.11pTM/D4.01, August 2008 • Employs OFDM PHY @ 5.9 GHz • Defines a WAVE mode of operation • 10 MHz and 20 MHz channels • Allows communications either with or without a WAVE Basic Service Set (WBSS) • Tightens tx frequency specs • Adds rx adjacent channel rejection requirements • Introduces a random local MAC address • Adds an extended temperature range • Recent changes • Change frame type used for WAVE Service Announcement, now Beacon • Proposal to remove WBSS concept as limiting, but not functionality

  8. Typical Band Use Plan in the US Shared Public Safety/Private Dedicated Public Safety Med Rng Service Veh-Veh Intersections Short Rng Service Control Power Limit 44.8 dBm 40 dBm Power Limit 33 dBm Power Limit 23 dBm Uplink Downlink Public Safety/ Private Ch 174 Public Safety/ Private Ch 176 Public Safety/ Private Ch 180 Public Safety/ Private Ch 182 Public Safety Intersections Ch 184 Public Safety Veh-Veh Ch 172 Control Channel Ch 178 Frequency (GHz) 5.850 5.855 5.870 5.880 5.890 5.905 5.860 5.865 5.875 5.885 5.895 5.900 5.910 5.920 5.925 5.845 5.835 5.915 5.840

  9. IEEE Std 1609.4™-2007 • Supplements 802.11 MAC features • Coordinates operation on Control Channel (CCH) and Service Channels (SCH) • CCH intended for broadcast, high priority, and single-use messages • SCHs intended for ongoing transactions • Incorporates 802.11-2007 transmission priority scheme

  10. IEEE Std 1609.3™-2007 • Data Plane • Defines use of existing UDP (TCP optional), IPv6, and LLC • Adds WAVE Short Message Protocol (WSMP) • Management Plane • WAVE Management Entity (WME) • Manages WAVE Basic Service Set (WBSS) participation in support of applications • Coordinates IPv6 configuration

  11. Channel Coordination • Default receive on predefined Control Channel • Operate on a Service Channel when participating on a WAVE Basic Service Set (WBSS) • Control and Service Channel intervals default to 50 ms

  12. Communications Options • WAVE Short Message Protocol (WSMP) • Used on both Control and Service Channels • No setup required • Limited to 1400 bytes • Limited to WAVE-aware devices • IPv6 • Used on Service Channels only • When operating on WBSS • Allows access to generic applications and networks

  13. Scope of User Communications Signaling WSM WSM with forwarding IPv6

  14. WAVE Communications Concepts • Application registration • Provider or User role • Provider Service Identifier (PSID) & Provider Service Context (PSC) • PSID allocated by IEEE • WAVE Basic Service Set (WBSS) • WAVE Service Advertisement (WSA) • Sent on Control Channel, by Provider role • Join, by User role • PSID matching • Confirm-before-join • End

  15. Any device may act as Provider or User Device defaults to Control Channel (CCH) monitoring when not joined to a WBSS Returns to CCH monitoring when complete Simplified User-Side Process Flow NO Start Matching Application Announcement Received? Application Registration Control Channel Monitoring YES Join WBSS Operate on Service and Control Channels Higher Priority Announcement? NO YES

  16. Setup and Joining a WBSS

  17. IEEE p1609.5 Communications Manager • New project agreed in spring 2008 to address addiitonal trial use lessons learned • Contents under discussion, may include • New WSMP features • Repetitive message generation by the stack • Message relay for increased coverage • Duplicate filtering • Location aware services • Little work done in this area • Different channel timing schemes for increased efficiency and quality of service • Standardized Application Program Interface(s) for data, control, test • More flexible communications service management (see following)

  18. Trial Use Communication Service Management (1609.3) Semi-static info Dynamic info

  19. Proposed Use of Available Services List in 1609.5 Semi-static info Dynamic info New info flow Note: trial use terminology used

  20. Current Status • 802.11p being finalized • 1609 family finalized for Trial Use and implemented • Vehicle Infrastructure Integration (VII) initiative Lessons learned being incorporated into Full Use standards • Include new Architecture and Communications Manager standards Certification program being developed outside IEEE

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