Understanding High-Level Requirements of NGV in IEEE 802.11-18-0933r0
Explore the high-level requirements of NGV in the IEEE 802.11-18-0933r0 document, emphasizing backward compatibility with 802.11p and the importance of antenna diversity. Learn about the challenges and solutions for cooperative safety communication in vehicles and infrastructure globally.
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May 2018 doc.: IEEE 802.11-18-0933r0 High-level requirements of NGV Date: 2018-05-08 Authors: Name Onn Haran Ron Toledano Affiliations Address Autotalks Phone +972-9-866-5300 onn.haran@auto- email Kfar Netter, Israel talks.com ron.toledano@auto- talks.com Autotalks Kfar Netter, Israel Submission Slide 1 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 Abstract Backward compatibility with 802.11p can t be compromised Physical layer enhancements should be applied in very specific scenarios for assuring the backward compatibility 802.11p has a minor specification gap (diversity) Multi-channel use-cases will expand Submission Slide 2 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 Backward Compatibility 802.11p vehicles and infrastructure are deployed globally Cadillac CTS is available for purchase since 2017 VW announced mass-scale deployment from 2019 Toyota announced mass-scale deployment from 2021 Some infrastructure is already deployed and will expand significantly The essence of cooperative safety communication is backward compatibility Far more important than potential 2dB sensitivity improvement European Parliament voted for backward compatibility: 2. Highlights the need for a clear legal framework to support the deployment of C-ITS and welcomes a future delegated act under the ITS Directive (Directive 2010/40/EU) to ensure the continuity of services, deliver interoperability and support backward compatibility; Submission Slide 3 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 802.11p Specification Gap 802.11p doesn t specify antenna diversity Solutions in market do support antenna diversity RX diversity: MRC TX diversity: CDD Recommendation: 802.11ngv specification should formalize the de-facto implementations Submission Slide 4 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 Antennas Installation Considerations The majority of vehicles have a single 802.11p antenna OEMs will try to avoid a second antenna due to cost implications: cabling, amplification, handling A second antenna will be used only when absolutely needed to assure 360 coverage Recommendation: don t impose two antennas solution Correlation between two 802.11p antennas is low MIMO for V2V is likely unfeasible, but might be feasible for I2V (when RSU is tall) STBC for V2V would improve link budget, yet not backward compatible Recommendation: consider STBC, but not MIMO, as part of PHY enhancements Submission Slide 5 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 7 Channels Are Allocated Channel Number Src. and dest. Reserved: 5 MHz (lower 5 MHz of DSRC spectrum) V V I V Intersection safety I V safety and mobility Miscellaneous/private use (non-priority) P V I P I V WAVE Service Advertisements Broadcast-based applications V I V V Mobility applications Miscellaneous/private use (non-priority) SCMS I V safety and mobility applications V I/V P I/V Public Transit SAE J2945/0 Channel List Application Types 172 V2V safety, situational awareness (5.855 to 5.865 GHz) 174 I V VRU SCMS 176 178 I V Future non BSM-based V2V safety (e.g. CACC) 180 182 I V 184 Public Safety (5.915 to 5.925 GHz) Submission Slide 6 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 Physical Layer Compatibility Suggestion Mode Use-case Candidate channels 172, 178 Method of operation Legacy Channel is used Existing broadcast services Channel is currently unused Expecting new broadcast and unicast services Channel is partially used 802.11p only Greenfield 174, 180, 182 802.11ngv Mixed 176 Existing broadcast services continue to use 802.11p Unicast and new services will use 802.11ngv (with fallback option to 802.11p) Table is subject to change as new DSRC services can be introduced before 802.11ngv specification is completed Submission Slide 7 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 Multi-channel Operation Multi-channel use-cases will expand Other channels shall not harm safety channel IEEE1609.4 defines multi-channel operation but doesn t consider cross-channel interferences While transmitting, vehicle reception might be disabled X Transmitting vehicle might harm nearby vehicles reception of other channels X Submission Slide 8 Onn Haran (Autotalks)
May 2018 doc.: IEEE 802.11-18-0933r0 Multi-channel Operation Options Do nothing Control timing of service channel transmissions to avoid missing important safety messages For example, concurrent transmission of safety and non-safety messages Other? Recommendation: study limitations of multi-channel operation, and potential mitigation mechanisms Study is in 802.11 domain even if specification might eventually fall within IEEE1609 scope Submission Slide 9 Onn Haran (Autotalks)
