doc.: ieee 802.11-07/0270r2 submission march 2007 matthew gast, dave stephensonslide 1 emergency...
TRANSCRIPT
March 2007
Matthew Gast, Dave Stephenson
Slide 1
doc.: IEEE 802.11-07/0270r2
Submission
Emergency Call Setup Procedure
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Date: 2007-02-22
Name Company Address Phone email Matthew Gast Trapeze Networks 5753 W. Las Positas
Blvd, Pleasanton, CA 94588 USA
+1 (925) 474-2273
Dave Stephenson Cisco Systems 170 W. Tasman Dr. San Jose, CA 95134
+1 408 527 7991
Angelo Centonza Roke Manor Research Ltd
Old Salisbury Lane, Romsey, Hampshire, SO51 0ZN, UK
+44 1794 833185
Authors:
March 2007
Matthew Gast, Dave Stephenson
Slide 2
doc.: IEEE 802.11-07/0270r2
Submission
Abstract
Frame exchange diagram for Emergency Call Setup process of an 802.11u-capable STA.
This is an informative presentation summarizing some of the work which has produced other normative text for inclusion within the IEEE 802.11u draft.
Diagrams developed at February 2007 TGu/802.21 Ad Hoc Meeting (San Jose, California, USA)
March 2007
Matthew Gast, Dave Stephenson
Slide 3
doc.: IEEE 802.11-07/0270r2
Submission
AP(11u-capable)
STA(11u-capable)
Carrier Network
VLAN #5
Note: There does NOT need to be a 1-to-1 mapping between this and SSID #5.
Architecture
IEEE 802.21Information Server
AAA
DHCP
SSID #5
March 2007
Matthew Gast, Dave Stephenson
Slide 4
doc.: IEEE 802.11-07/0270r2
Submission
AP(11u-capable)
STA(11u-capable)
Configured by Hotspot owner / administrator
Beacon (ESN)Association request (SSID : Foo)
Association Response (…)
EAP Success (include PMK)
dela
y
Emergency Call : ESR Case
EAPOL/EAP-Response/Identity (e.g. anonymous@ESN)
EAPOL/EAP-Request/Identity
4-Way Handshake
March 2007
Matthew Gast, Dave Stephenson
Slide 5
doc.: IEEE 802.11-07/0270r2
Submission
AP(11u-capable)
STA(11u-capable)
Beacon (SSID: Foo, ESO bit)Association request (SSID : Foo)
Association Response (…)
Emergency Call : ESO Case
March 2007
Matthew Gast, Dave Stephenson
Slide 6
doc.: IEEE 802.11-07/0270r2
Submission
Event Flow
• Step 1: Get on network– Crypto (EAPOL required) vs clear
– ESO (anonymous) vs ESN (public credentials)
• Step 2: Get location– Currently liaising with 11v about location provision for Emergency calls.
– Which format (geospatial/civic)? See RFC 3619 (privacy protection issues)
• Step 3: Place call– Authentication again, at app layer
– Network design impact: restrict calls to emergency dispatch only
– Establish media stream
March 2007
Matthew Gast, Dave Stephenson
Slide 7
doc.: IEEE 802.11-07/0270r2
Submission
Emergency Call with 802.21 IS802.11u STA 802.11u AP
(MIH-aware)802.21 IS
Beacon (GAS: MIH)
Pre-configAdvertising protocol =
IS (APID)Length limitation req
from 11u to 21
Probe REQ
Probe RSP (GAS: MIH)
GAS init req (MIH IE: e911 req)MIH frame (e911 req)
GAS init resp (Query ID, comeback_delay)
Out of scope
802.11
802.21
MIH frame rsp (e911 accepted + IS Location)
GAS comeback req (Query ID)
GAS comeback rsp (Query ID, e911 accepted)
comeback_delay
March 2007
Matthew Gast, Dave Stephenson
Slide 8
doc.: IEEE 802.11-07/0270r2
Submission
Questions and notes
• NAI or ESR (Emergency Service Realm)• Well known format, assigned by hotspot administrator or by AAA configuration (AP MIB?)
– e.g sos.dot11.org
• Need ESR text. Update to Annex P?– ESR is used to route authentication request to the right AAA server, but ESR will be replaced with NAI
• How do we ‘officially’ change this?– msg’s – ESR -> ESN – objects – restricted / colorful?
• EAP primitive (EAP native) messages can possibly be used– a new EAP method that would be a "null" authentication but enable derivation of a
PMK– transmitting the PMK in an EAP message– standardizing a pre-shared PMK for all emergency calls.
March 2007
Matthew Gast, Dave Stephenson
Slide 9
doc.: IEEE 802.11-07/0270r2
Submission
Additional Notes 1
• Beacon Management Frames– AP’s BSSID
– SSID – Foo
– ESSID (or WIID)
– Interworking Capability IE (ESO)
– GAS Capability IE
March 2007
Matthew Gast, Dave Stephenson
Slide 10
doc.: IEEE 802.11-07/0270r2
Submission
Layer Parameters
• L2 ACLs: SA, DA, ET, Pri, ULAN ID
• L3 ACLs: SA, DA, DSCP, SP, DP, IPP
March 2007
Matthew Gast, Dave Stephenson
Slide 11
doc.: IEEE 802.11-07/0270r2
Submission
AP QoS Parameters
Use T/F Max Rate
AC - VO T ~160 kbps
VI F
BE T ~100 kbps
BK F