1. 802.11u and Emergency Services
Month Year
doc.: IEEE yy/xxxxr0
July 2007
802.11u and Emergency Services
Date:
Authors:
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Matthew Gast, Trapeze Networks
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
July 2007
Abstract
Introduction to u for the IEEE 802 emergency services ad hoc in San Francisco, CA in July 2007.
Note: This presentation is based on u-D1.0 and subject to change by future standards activity.
Matthew Gast, Trapeze Networks
John Doe, Some Company

3. Month Year
doc.: IEEE yy/xxxxr0
July 2007
Major Features of u
External network (“SSPN”) interface for extended authorization
New QoS features
Generic Advertising Service (GAS)
Emergency services recommendations (informative)
Use case #1: open network
Use case #2: public credentials
Matthew Gast, Trapeze Networks
John Doe, Some Company

4. External Network (SSPN) Interface
Month Year
doc.: IEEE yy/xxxxr0
July 2007
External Network (SSPN) Interface
SSPN = Subscription Service Provider Network
SSP holds user credentials
May build or partner with access networks
The SSPN may direct the STA-AN, for example by:
Requiring that a certain encryption type is used (e.g. CCMP only)
Setting allowed access rates for different types of traffic (e.g. 80 kbps voice, no video, and up to 500 kbps best effort)
Specifying a minimum delay bound on transmitted frames
Admission Control
TSPEC processing is subject to authorized data rates as specified by SSPN
Matthew Gast, Trapeze Networks
John Doe, Some Company

5. QoS Signaling in 802.11u Expedited Bandwidth Request QoS Map July 2007
Month Year
doc.: IEEE yy/xxxxr0
July 2007
QoS Signaling in u
Expedited Bandwidth Request
has only four categories (voice, video, best effort, and background)
Many STAs may request high-priority voice service
EBR allows a STA to describe the reason that it is requesting service and the network can act accordingly
Example: emergency calls and first-responder traffic can pre-empt “normal” voice traffic
QoS Map
QoS settings only affect last-hop access; QoS Map allows APs and STAs to extend higher-layer QoS settings
Ensures correct QoS treatment of frames even if destination networks use DSCP differently
Matthew Gast, Trapeze Networks
John Doe, Some Company

6. Generic Advertising Services (GAS)
Month Year
doc.: IEEE yy/xxxxr0
July 2007
Generic Advertising Services (GAS)
Interface to external information sources
Example: Carrier of data
Extensible for types beyond
“Native” query mode
Assists STA with information stored in the access network
Example: enhances scan for multi-SSID use, so that a secondary SSID can be used for emergency services
Operational details (in brief)
Multicast/unicast operation
Query size limits: administrators can configure response limit size
Emergency Services native query: type of authentication
Matthew Gast, Trapeze Networks
John Doe, Some Company

7. Emergency Services Use Case #1: Dedicated SSID
Month Year
doc.: IEEE yy/xxxxr0
July 2007
Emergency Services Use Case #1: Dedicated SSID
Uses “emergency services only” (ESO) bit to signal that the SSID can support emergency services without any level security
Network must enforce appropriate security (out of scope for )
Network is “locked down” to emergency calls only
e.g. dedicated VLAN, IP firewall
STA
(11u-capable) AP
(11u-capable)
Beacon (w/ESO bit)
Note: SSID list is optional; used in multi-SSID
deployments
GAS Native Query (SSID list + ES info)
GAS Native Query Response
Association Request
Association Response
ADDTS Request (w/Expedited BW Req.)
ADDTS Response
Restricted Network
e.g. dedicated VLAN, IP filtering, etc.
Initiate higher-layer call (e.g. SIP)
Matthew Gast, Trapeze Networks
John Doe, Some Company

8. Emergency Services Use Case #2: Public Credentials
Month Year
doc.: IEEE yy/xxxxr0
July 2007
Emergency Services Use Case #2: Public Credentials
ESO calls have no cryptographic protection (tampering, injection, forgery)
To provide cryptography, i security must be used
Pre-shared key for all emergency networks is not feasible
802.11u provides a way for a network to set up an “emergency public credential” to use EAP methods
EAP method needs clarification
STA
(11u-capable) AP
(11u-capable)
GAS Native Query (emergency public credentials)
GAS Native Query Response (credentials)
Association Request
Association Response
EAPOL/EAP-Identity-Request
EAPOL/EAP-Identity-Response (credentials)
EAP method authentication
4-Way Handshake
ADDTS Request (w/Expedited BW Request)
ADDTS Response
Initiate higher-layer call (e.g. SIP)
Matthew Gast, Trapeze Networks
John Doe, Some Company