IEEE 802.11-19/0752-00-00bd and 1609.4 Protocol Stack Overview
Explore the protocol stack overview of IEEE 802.11-19/0752-00-00bd and IEEE 1609.4, including management and data SAPs, primitives comparison, historical purposes, and more. Discover insights into higher layers interface to IEEE 1609, security implementations, channel coordination features, and management entities. Learn about PHY features, security services, and the utilization of frequency bands. Dive into the complexity of channel switching, safety channels, and the abstracted power controls.
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May 2019 doc.: IEEE 802.11-19/0752-00-00bd IEEE 1609 / 802.11 Joint Session Date: 2019-05-07 Authors: Name Affiliation Address Phone Email STE 705 PMB 154 3830 Valley Centre Dr. San Diego, CA 92130 JMC Rota Inc., IEEE 1609 Vice Chair Justin McNew justinm@jmcrota.com 310 922 4923 Submission Slide 1 Justin McNew, JMC Rota
doc.: IEEE 802.11-19/0752-00-00bd IEEE 1609 / SAE Standards Overview Applications / higher layers interface to IEEE 1609 Device Device SAE J2945/x Application SAE J2945/x Application SAE J2735 Messages SAE J2735 Messages * * (DSRC) IEEE 1609 / 802.11 (DSRC) IEEE 1609 / 802.11 Submission
doc.: IEEE 802.11-19/0752-00-00bd 1609-Compliant Protocol Stack 802.11 is used in OCB mode Bypasses traditional 802.11 association to reduce latency What PHY features from 802.11ac/ax are available without association? Security is implemented on MSDUs above the MAC Layer 2 security is not used (addressed by IEEE 1609.2) Management Plane Data Plane UDP / TCP / other 1609.3 WSMP management entities Security Services IPv6 Layer-specific Note: 1609.2 security services do not interface with the 802.11 MLME or PLME LLC 1609.4 WAVE MAC 802.11 PHY 1609.2 Submission
doc.: IEEE 802.11-19/0752-00-00bd 1609.4: Historical Purpose Develop the channel coordination features required by industry to utilize the complete frequency band (5.850 GHz to 5.925 GHz) Control channel / service channel approach, with dedicated safety channels Hide the complexity of channel switching from application developers Avoid modifying the MA-UNITDATA.request At the time of 802.11p, modifying this primitive was not considered an option Submission
May 2019 doc.: IEEE 802.11-19/0752-00-00bd 1609.4 Management and Data SAPs / Primitives Conceptually MLMEX management SAP used to manage the MLME in the context of channel switching MA-UNITDATAX data SAP used to abstract the power, rate and channel controls from the existing MAC SAP and route them through the MLMEX to the MLME Submission Slide 5 Justin McNew, JMC Rota
doc.: IEEE 802.11-19/0752-00-00bd 1609.4 and 802.11-2012 Primitives Comparison IEEE 1609.4 MA-UNITDATAX.request ( source address, destination address, routing information, data, priority, service class, Channel Identifier, Time Slot, Data Rate, TxPwr_Level, ExpiryTime ) IEEE 802.11 MA-UNITDATA.request ( source address, destination address, routing information, data, priority, service class ) The channel switching features are out of band from the MAC data SAP and abstracted by the MLMEX Submission
doc.: IEEE 802.11-19/0752-00-00bd How we did it Implementers generally modified MAC firmware to combine the 1609.4 multi-channel operation with traditional 802.11 functionality Examples: broadcast or data collection applications WAVE Short Message used for broadcast messages WAVE Service Advertisement (WSA) used to announce a service Just another MSDU from the MAC s perspective DSRC DSRC Cloud X V Host RSU OBU (802.11p + 1609) (802.11p + 1609) (RSU or OBU) (OBU) A WAVE Short Message (WSM) can be sent on any channel can be specified ahead of time (e.g. V2V safety channel) The WSA contains a WAVE Router Advertisement (WRA) in this case WSA (WRA) WSM [J2735 message] Information broadcasts are used to transmit, for example, SAE J2735 BSM & SPaT messages WSM [J2735 message] . . . Channel Switch Peer to Peer Data Exchange (IP) WSM [J2735 message] Example applications: Probe probe data collection Road weather data collection and distribution SCMS Submission
doc.: IEEE 802.11-19/0752-00-00bd Next Generation V2X Desirements IEEE 1609 supports the V2X direction of 802.11 TGbd Packet-by-packet features of interest for the MA-UNITDATA.request Selectable data rate and power Selectable mode(s) E.g. legacy and NGV mode (other modes?) Operating mode(s) features of interest Upper layers choose legacy or NGV mode (pre-configured through MLME) Let MAC / PHY choose which mode based on observed preambles / SIGNAL Other potential features improvements MAC address change feature extensions might be useful MLME-RESET was originally used for MAC address randomization (with a 2-TU time limit for a reset in 802.11p) Locally administered random MAC address is currently used Others? Submission
