S1G Beacon Protection

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Explore the proposals for enhancing broadcast/multicast integrity protocol (BIP) to support protection of S1G Beacon frames in the IEEE 802.11-23/1774r0 standard. Changes to BIP, regulatory constraints, and proposed adjustments for S1G beacons are discussed in detail.

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doc.: IEEE 802.11-23/1774r0 October 2023 S1G Beacon Protection Date: 2023-10-20 Authors: Name Affiliations Address Phone email Henry Ptasinski Element78 Communications LLC henry@e78com.com David Goodall Morse Micro dave@morsemicro.com David Halasz Morse Micro dave.halasz@ieee.org Submission 1 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 Abstract Enhance broadcast/multicast integrity protocol (BIP) to support protection of S1G Beacon frames Submission 2 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 Comments from initial SA ballot on REVme D4.0 CID 6054: Comment: There is no beacon protection for the S1G beacon, which is an extension frame. Proposed Change: Add protection to the S1G beacon. CID 6338: Comment: CID 1396: should support beacon protection for S1G and DMG, else they will not be protected Proposed Change: Add support for (S1G/DMG) beacon protection in S1G and DMG BSSes Submission 3 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BIP Changes for S1G S1G Beacons are Extension frames Frame header is different than for Beacon frames AAD construction needs to be adjusted Submission 4 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BIP Changes for S1G Regulatory constraints in some jurisdications For example, APs in Japan and Europe have a 10% duty cycle per hour, making reduction of Beacon Protection overheads very desirable for S1G For Japan see ARIB T108: https://www.arib.or.jp/english/std_tr/telecommunications/ desc/std-t108.html For Europe see ETSI EN 304 220-1: https://www.etsi.org/deliver/etsi_en/304200_304299/30422 001/01.01.00_20/en_30422001v010100a.pdf Submission 5 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BIP Changes (Normal operation) Construct AAD using: FC MPDU Frame Control field. SA address of the STA transmitting the S1G Beacon frame. Change Sequence. Next TBTT (if present). Compressed SSID (if present). Access Network Options (if present). Remainder of BIP processing is basically the same as existing BIP Submission 6 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BIP Compact Encapsulation (BCE) Reduced overhead, for use in low duty cycle regulatory environments Derive BIPN based on TSBTT/TBTT Signal Key ID via S1G Beacon Compatibility element Replace MME with MIC element Include BIPN in AAD PN not used directly in AES-CMAC processing PN in current BIP protected by inclusion in frame payload (MME) Size reduction: 8 bytes Submission 7 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BCE BIPN Derivation If dot11ShortBeaconInterval is true: BIPN = CurrentTSBTT / (1024 dot11ShortBeaconPeriod) CurrentTSBTT is the TSBTT of the S1G Beacon frame that is being protected If dot11ShortBeaconInterval is false: BIPN = CurrentTBTT / (1024 dot11BeaconPeriod) CurrentTBTT is the TBTT of the S1G Beacon frame that is being protected Transmitter could use e.g.: Ceil(TSF/(1024 x dot11BeaconPeriod)) Receiver could use e.g: Floor(TSF/(1024 x dot11BeaconPeriod)) Submission 8 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BCE Key ID Signaling Use B7 of the S1G Beacon Compatibility element to indicate BIGTK Key ID: B7 = BIGTK Key ID - 6 Valid values for the BIGTK Key ID are 6 or 7 (see 6.5.14.1 (MLME-SETKEYS.request)). Submission 9 Henry Ptasinski, Element78 Communications

doc.: IEEE 802.11-23/1774r0 October 2023 BCE AAD Construction Construct AAD using: FC MPDU Frame Control field. SA address of the STA transmitting the S1G Beacon frame. Change Sequence. Next TBTT (if present). Compressed SSID (if present). Access Network Options (if present). BIPN Submission 10 Henry Ptasinski, Element78 Communications