Proposal for TIG Supporting Wireless LAN Access in Moving Vehicles
Explore a proposal for implementing a Task Group (TIG) to support Wireless LAN (WLAN) access in moving vehicles, addressing challenges related to time-sensitive data demands, MAC layer improvements, and potential PHY modifications. The proposal includes a two-phased approach focusing on speeds typical in urban driving scenarios and investigating Doppler mitigations for improved connectivity. Authors discuss current remedies, roaming challenges, fast and scalable scanning, AP selection mechanisms, authentication processes, and issues related to inter-ESS handovers.
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4/12/2025 doc.: IEEE 802.11-24/1062r3 Proposal for a TIG for Moving Vehicles Wireless LAN Access Date: 2024-07-15 Authors: Name Azin Neishaboori Affiliations General Motors Address 29427 Louis Chevrolet Road, Warren MI 48093 Phone email azin.neishaboori@gm.com Submission Slide 1 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 Abstract The number of connected vehicles is growing rapidly Infotainment is a major use case for connected vehicles with a significant amount of time-sensitive data demand Current implementations rely solely on a cellular connection for time- sensitive data downlink and uplink for a moving connected vehicle We propose creation of a TIG for supporting moving vehicles WLAN connection A potential two-phased approach includes: Phase 1: Target speeds typical in downtown and busy suburban driving (typically ~ 40 km/h or less) and focus on potential gaps in the MAC layer and above Phase 2: Investigate the feasibility of PHY modifications for better Doppler mitigations Submission Slide 2 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 Piecing together the current remedies: Intra & Inter ESS Roaming MAC challenges under high mobility Need Fast and Scalable Scanning and AP Selection: Solicited/unsolicited Neighbor Report (802.11k/v/ai), BTM (802.11v), and FILS discovery (802.11ai) Currently only intra-ESS Authentication before association: STA to try to associate with an AP it will succeed to authenticate with Fast BSS Transition (FT) allows authentication with target AP before breaking link with current AP Currently only intra-ESS Passpoint (802.11u): STA can identify APs based on Network Address Identifier realms it has credentials for, stored preferences, prior associations, etc. ANQP/GAS helpful but not always fast enough Realm info (or their hash) included in beacon/probe response more helpful than ANQP-based Need Fast and Scalable Association to Next AP: FILS Helps with resource request booking - Currently only intra-ESS 802.11bn proposed solutions leveraging ML Currently only intra-ESS Need Fast and Scalable Authentication/Secure link establishment with next AP: Lighter authentication process: FILS authentication (using EAP-RP), FT, PMKSA Caching, Opportunistic Key Caching, Currently only intra-ESS NOTE: Inter-ESS solutions less addressed and tougher to solve Time-To-First- Byte Ping Authentication and DHCP Association Scan ~ 9.7 secs TTFB 5 secs for scanning Submission Slide 3 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 Piecing together the current remedies: Intra & Inter ESS Roaming Cont d Time-To-First- Byte Higher layer issues under high mobility Intra-ESS solutions currently available: To fix DHCP latency/disruption due to reassigning an IP address: 802.11ai/FILS IP address configuration For inter-ESS, potential solutions might include (but are not limited to): Mobile IP Potential expansion of the scope of FT (802.11r) and/or FILS (802.11ai) Expand Fast BSS Transition to allow IP address acquisition prior to breaking the current AP association Allow over-the-air exchange of APs from adjacent ESSs for handover coordination APs from adjacent ESS rely on a higher-layer protocol for handover coordination Ping Authentication and DHCP Association Scan ~ 9.7 secs TTFB 5 secs for scanning Submission Slide 4 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 Tentative Objectives - Phase 1 Take steps toward seamless roaming both for Intra- and Inter- ESS including: Fast Target AP Discovery with helpful metrics advertised to help next AP selection Make Before Break Link Establishment Authentication Before Association Minimal IP Address reacquisition/reacquisition latency due to AP-AP handover Scalability of AP discovery and authentication Submission Slide 5 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 Proposed Text for the Scope of Automotive WLAN TIG The Moving Vehicle WLAN Topic Interest Group will investigate the current gaps in IEEE 802.11 standards in achieving seamless connectivity for vehicles via external 802.11 APs. Submission Slide 6 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 Conclusion Requesting support for creation of a TIG for Automotive WLAN Use Case Submission Slide 7 Azin Neishaboori, General Motors
4/12/2025 doc.: IEEE 802.11-24/1062r3 References 80211-2020 802.11-24/378r0 802.11-24/415r1 802.11-24/793r1 Submission Slide 8 Azin Neishaboori, General Motors
