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Emergency Services Use Case #1: Dedicated SSID Uses “emergency services only” (ESO) bit to signal that the SSID can support emergency services without any 802.11-level security Network must enforce appropriate security (out of scope for 802.11) Network is “locked down” to emergency calls only e.g. dedicated VLAN, IP firewall AP (11u-capable) STA (11u-capable) Beacon (w/ESO bit) Association Request Association Response Initiate higher-layer call (e.g. SIP) GAS Native Query (SSID list + ES info) GAS Native Query Response Restricted Network e.g. dedicated VLAN, IP filtering, etc. Note: SSID list is optional; used in multi-SSID deployments ADDTS Request (w/Expedited BW Req.) ADDTS Response |