Service announcement using IEEE WAVE Service Advertisement as a model
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1 Service announcement using IEEE WAVE Service Advertisement as a model 6 th ETSI ITS Workshop February 2014 Anders Hjelmare, Kapsch TrafficCom John Moring, IEEE P1609 Working Group Kapsch TrafficCom ETSI ITS Workshop Berlin
2 WAVE* Service Advertisement (WSA) Informs ITS stations of locally accessible services Generally application data services Provider Service ID (PSID/ITS-AID) Channel info WAVE assumes 5.9GHz operation, analogous to ETSI G5 Provides IP configuration info * WAVE = Wireless Access in Vehicular Environments Router address, subnet, etc. Supports other miscellaneous announcements E.g., country of operation May be signed but is not encrypted Standardized in IEEE Std for trial use in 2007, and full use in 2010; extensive operational experience Kapsch TrafficCom ETSI ITS Workshop Berlin
3 Example scenario 1. Provider broadcasts info about locally accessible services 2. User device enters 3. User exchanges data coverage zone, receives with Provider to complete advertisement, recognizes the service desirable service Kapsch TrafficCom ETSI ITS Workshop Berlin
4 ETSI ITS G5 and IEEE 1609 protocol models Secu urity Manage ement Management Plane Data Plane Kapsch TrafficCom ETSI ITS Workshop Berlin
5 WSA example message flow Provider Higher layer standards User App App register register UDP / TCP / other IPv6 WSMP LLC Build WSA WAVE MAC (including channel coordination) PHY Check for match broadcast Control Ch. unicast Service Ch. IEEE Vendor-specific Action management frame type used for WSA So stations are not forced to implement the WAVE Short Message Protocol (WSMP) Kapsch TrafficCom ETSI ITS Workshop Berlin
6 Data plane delivery of announcements Provider App. User App. Facilities CAM DEN SAM basic basic basic service service service Facilities CAM DEN SAM basic basic basic service service service Networking & Transport Access Networking & Transport Access Control Ch. Service Ch. 05/12/2012 Kapsch TrafficCom ETSI ITS Workshop Berlin
7 Contents of WAVE Service Advertisement 1 Var. WAVE version/ change count Extension fields Service Info Channel Info WAVE Routing Advertisement 1 WAVE Element ID=1 Header Var. 1 1 PSID Service Priority Channel Index Var. Extension fields KEY Optional Field Lengths in octets 1 WAVE Element ID=2 May be repeated Operat- ing Class Channel Adapt- Data Number able Rate Transmit Power Level Var. Extension fields Optional extension fields (tag-length-value) allow growth May be repeated Var. WAVE Element ID=3 Router lifetime IpPrefix Prefix length Default gateway Primary DNS Extension fields Kapsch TrafficCom ETSI ITS Workshop Berlin
8 WSA may be supplemented for ETSI Announcement of GeoNet/BTP services Platooning Protocol identifiers, including GeoNet/BTP BTP port number (not used in WAVE) Other data elements Advertiser velocity vector (for platooning) General features multi-hop Delivery over data plane (via GeoNet/BTP) Offers multi-hop to extend range Offers geographical area addressing ASN.1 with PER encoding geo area Kapsch TrafficCom ETSI ITS Workshop Berlin
9 Harmonization In 2013, the EU-USUS ITS Task Force (Harmonization Task Group 3) published a report on differences among ISO, CEN, ETSI, and IEEE standard protocols* ISO and IEEE have been investigating the possibility of aligning their advertisement message formats and protocols There is a proposal in ETSI for a service advertisement based on the WSA * Kapsch TrafficCom ETSI ITS Workshop Berlin
10 References IEEE Std WAVE Architecture IEEE Std WAVE Security Services for Applications and Management Messages IEEE Std WAVE Networking Services IEEE Std WAVE Multi-channel Operation IEEE Std Allocated Numbers IEEE Std Wireless LAN MAC and PHY Specifications ISO :2013 Fast Service Advertisement Protocol (FSAP) ETSI Work Item: TS Facilities Service Announcement Kapsch TrafficCom ETSI ITS Workshop Berlin
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