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Notes on Interworking with External Networks - IEEE Standards

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					July 2010                                               doc.: IEEE 802.11-09/1272r2


    Notes on Interworking with External Networks
                                 Date: 2010 07 22
Authors:
Name              Affiliations   Address               Phone            email
George Bumiller   Research In    39 Lakeview Terrace   +1 201 327       g.bumiller@ieee.org
                  Motion         Ramsey, NJ 07446      1136
                                 USA




Submission                               Slide 1                George Bumiller, Research In Motion
July 2010                           doc.: IEEE 802.11-09/1272r2


                      Abstract

 This presentation provides an overview of the main
   features included in the current draft D_10.0 of
   Interworking with External Networks.
 Extracts from the draft are provided, to stimulate
   discussion, comment and suggestions from other SDOs.
 The draft has been proceeding through Sponsor Ballot
   status, indicating a reasonable degree of maturity.
 Note that it is only a draft, not a standard, and may
   change.


Submission                Slide 2        George Bumiller, Research In Motion
July 2010                                      doc.: IEEE 802.11-09/1272r2


                               Agenda

 IEEE 802.11
 IEEE 802.11u
 IEEE 802.11u Features
       Network Discovery and Selection
       Emergency Services
       QoS Map distribution
       SSPN Interface service between the AP and the SSPN
 Comments and Suggestions Requested
 References
 Extracts from IEEE 802.11u draft D_10.0

Submission                         Slide 3          George Bumiller, Research In Motion
July 2010                             doc.: IEEE 802.11-09/1272r2


                     IEEE 802.11

 IEEE 802.11-2007 is (together with recently-standardized
   amendments) the current standard.
 IEEE 802.11p, Wireless Access in Vehicular Environments is
   the latest amendment standardized.
 TGu, Interworking With External Networks is the initiative
   which supports and extends the current use of WLAN
   for other Wide Area Networks (WANs). It has
   progressed through letter ballot, and is now in Sponsor
   Ballot (the final balloting stage) at draft D_10.0.



Submission                  Slide 4        George Bumiller, Research In Motion
July 2010                                   doc.: IEEE 802.11-09/1272r2

             IEEE 802.11 – Current and Draft
                      Amendments
 • Today’s standard: IEEE 802.11-2007 +
   802.11 k, r, y, n, p.
             Single document in process.
 • Today’s drafts in Sponsor Ballot:
     802.11 u, v, and z.

 Note that the draft amendments refer to items being added by other
   draft amendments. These are based on an expected approval
   sequence, and will be adjusted if approvals are in a different
   sequence.
Submission                       Slide 5          George Bumiller, Research In Motion
July 2010                                     doc.: IEEE 802.11-09/1272r2


             Sequencing of Draft Amendments

 There are three draft amendments before this draft, 11u.
 There are dependencies, with some draft amendments making use of
   certain functions defined in earlier draft amendments.
 Therefore, for a better understanding of this (u) draft, one needs to
   refer to those functions in the draft amendments scheduled for
   standardization before 11u. The sequence is:
             z AP-Independent Direct Link Setup
             v Wireless Network Management
             u Interworking with External Networks




Submission                         Slide 6           George Bumiller, Research In Motion
July 2010                                            doc.: IEEE 802.11-09/1272r2


                     Steps in IEEE 802.11u

 • Study Group
 • Technical Group, TGu
       – Develop Requirements
       – Develop Draft Specification, then start balloting
       – Ballot Draft (until no required technical comments remain)
 • Sponsor Ballot (IEEE-wide balloting) current status
 • Adoption as Approved Amendment (& published)
 • Integration into IEEE 802.11-20xx

Submission                              Slide 7             George Bumiller, Research In Motion
July 2010                                          doc.: IEEE 802.11-09/1272r2

             Interworking with External Networks,
                        IEEE 802.11u

 This adds and enhances four major features:
             Network Discovery and Selection,
             Emergency Services ,
             QoS Map distribution,
             SSPN Interface service between the AP and the SSPN.
 The discovery of these services is enabled through advertisement
   services, providing interchange of data between the STA (mobile)
   and the AP, without need for the STA to be associated.
 The AP is able to provide generic container data [provided by each of
   the WAN technologies], to assist the STA in its interworking.



Submission                             Slide 8          George Bumiller, Research In Motion
July 2010                               doc.: IEEE 802.11-09/1272r2


             Abbreviations and Definitions

 ANQP: Access Network Query Protocol
 Non-AP STA – non-Access Point Station, i.e. a mobile unit
 GAS: The Access Network Query protocol transported by GAS
   Public Action frames [does not require association with the
   AP]
 HESSID (homogenous ESS Identifier): A collection of BSSs,
   within the same extended service set (ESS), in which the
   SSPN or other external network reachable at one BSS, is
   reachable at all of them.
 OI: organization identifier [may be used to identify SSPNs,
   aggregators and other operating organizations.]
 SSPN: subscription service provider network
Submission                    Slide 9        George Bumiller, Research In Motion
July 2010                                               doc.: IEEE 802.11-09/1272r2


             Network Discovery and Selection

 • Previously
             • Use SSID, associate. Destination reachable?
             • Associate with next AP,…(if the first one unusable)
             • Continue until usable AP reached
 • With 802.11u
             • Check APs concurrently without association
             • Up to three OIs in beacon or probe response

 • Result
             • Faster discovery and selection, compared to sequential association
               with APs



Submission                                Slide 10            George Bumiller, Research In Motion
July 2010                                        doc.: IEEE 802.11-09/1272r2


             Network Discovery and Selection
                                    (Extract)



       • Discovery of suitable networks through the advertisement of
         access network type, roaming consortium and venue information,
         via management frames
       • Selection of a suitable IEEE 802.11 infrastructure using
         advertisement services (e.g., ANQP or an IEEE 802.21
         Information Server) in the BSS or in an external network reachable
         via the BSS
       • Selection of an SSPN or External Network with its corresponding
         IEEE 802.11 infrastructure




Submission                           Slide 11         George Bumiller, Research In Motion
July 2010                                         doc.: IEEE 802.11-09/1272r2


             Advertisement Protocol ID definitions

 Name
   Access Network Query Protocol
             Emergency Call information
             Roaming Consortium information
             Cellular Network information
             NAI realm information
      MIH Information Service
      MIH Command and Event Services
          Capability Discovery
      Emergency Alert System (EAS)
      Location-to-Service Translation Protocol

Submission                             Slide 12        George Bumiller, Research In Motion
July 2010                                          doc.: IEEE 802.11-09/1272r2


                      Emergency Services

 Provides method for unauthenticated users to access
   Emergency Services
 Link level support
 Requires higher layer application
 • Emergency Calls
       Provides the local emergency call numbers
 • Emergency Alerts
       Provides emergency alerts, with a unique hash so that STAs (mobiles)
         know when each alert is new



Submission                          Slide 13            George Bumiller, Research In Motion
July 2010                              doc.: IEEE 802.11-09/1272r2


                    QoS Mapping

 For SSPNs and other external networks

 Re-maps the layer-3 service levels to a common over-the-
   air service level




Submission                  Slide 14        George Bumiller, Research In Motion
July 2010                             doc.: IEEE 802.11-09/1272r2


              SSPN Interface service

 A service between the AP and the SSPN
 Supports service provisioning and transfer of user
   permissions from the SSPN to the AP
 The IEEE 802.11 network interacts with the SSPN
   corresponding to the user of the non-AP STA either
   directly or via a roaming relationship.




Submission                 Slide 15        George Bumiller, Research In Motion
July 2010                                   doc.: IEEE 802.11-09/1272r2


                      Use of HESSID
 “… we recommended the use of the new parameter
   “HESSID”. We would just like to clarify that this an
   identifier of the network behind the layer 2 wireless
   route and that it should be used in conjunction with
   SSID, which is the existing WLAN radio access
   identifier. Both HESSID and SSID are therefore used
   together to discover a specific WLAN and its network
   attachment. If the HESSID parameter is not available
   in the WLAN hotspot, then the SSID is used only, as
   with current implementations.”
 HESSID (homogenous ESS Identifier) A collection of BSSs, within the
   same extended service set (ESS), …


Submission                      Slide 16         George Bumiller, Research In Motion
July 2010                              doc.: IEEE 802.11-09/1272r2


                       Summary

 Interworking With External Networks
 • Enables faster discovery and selection of WLANs
 • HESSID assists in the identification of WLANs
 • Generic Advertisement Service
 • Locally-stored data is accessible through native query
   protocol, e.g. provided for each WAN technology
 • IEEE 802.21 (when available) may be accessed
 • Support for Emergency Services (calls and alerts)
 • QoS Map

Submission                  Slide 17        George Bumiller, Research In Motion
July 2010                                     doc.: IEEE 802.11-09/1272r2

             Your Suggestions, Comments and
                 Questions are requested
 Bruce Kraemer
       IEEE 802.11 Working Group Chair
       bkraemer@marvell.com
       +1 321 427 4098


 Stephen McCann
       IEEE 802.11 Secretary & IEEE 802.11 Task Group u Chair
       smccann@rim.com
       +44 1753 667099



Submission                        Slide 18         George Bumiller, Research In Motion
 July 2010                                             doc.: IEEE 802.11-09/1272r2

                                 References
IEEE 802.11u Draft 10.0 (July 2010)
Please note that IEEE 802.11u Draft 10.0 (June 2009) is available for purchase at the
    IEEE shop:
https://sbwsweb.ieee.org/ecustomercme_enu/start.swe?SWECmd=GotoView&SW
    EView=Catalog+View+(eSales)_Standards_IEEE&mem_type=Customer&SW
    EHo=sbwsweb.ieee.org&SWETS=1192713657
Then go to Individual Standards: Draft Standards (center column)
Enter “P802.11u” in the right-hand search box.

IEEE 802.11-2007                  (the current base standard)
Please note that IEEE 802.11 standards are available free six months after publication.
http://standards.ieee.org/getieee802/802.11.html
Note that amendments k, r, y, n, p are now standards. These amendments are now being
    integrated into a single document, which will become IEEE 802.11-2010

P802.11u_D10.0 2nd recirc comments spreadsheet
These comments have been used to update the extracts in this presentation.
11-10-0766-04-000u-d10-0-2nd-recirc-comments-spreadsheet.xls
Freely available at https://mentor.ieee.org/802.11/documents
 Submission                              Slide 19            George Bumiller, Research In Motion
July 2010                            doc.: IEEE 802.11-09/1272r2


             IEEE 802.11u D_10.0 extracts


Overview (1 & 2)
Generic Advertisement Service
Access Network Type
Advertisement Protocol ID definitions
Access Network Query Protocol information ID definitions
Interworking with External Network Procedures (1, 2 & 3)
Interactions with SSPN



Submission                Slide 20        George Bumiller, Research In Motion
July 2010                                                  doc.: IEEE 802.11-09/1272r2


                                 Overview - 1
                                           (Extract)

 5.4.8 Interworking with External Networks
 The Interworking Service allows non-AP STAs to access services provided by an
 external network according to the subscription or other characteristics of that external
 network. An IEEE 802.11 non-AP STA may have a subscription relationship with an
 external network, e.g., with an SSPN.
 An overview of the interworking functions addressed in this standard is provided below:
 —Network Discovery and Selection
     • Discovery of suitable networks through the advertisement of access network type,
           roaming consortium and venue information, via management frames
     • Selection of a suitable IEEE 802.11 infrastructure using advertisement services (e.g.,
           ANQP or an IEEE 802.21 Information Server) in the BSS or in an external
           network reachable via the BSS
     • Selection of an SSPN or External Network with its corresponding IEEE 802.11
           infrastructure
 —Emergency Services
     • Emergency Call and Network Alert support at the link level
 —QoS Map distribution
 —SSPN Interface service between the AP and the SSPN

Submission                                  Slide 21              George Bumiller, Research In Motion
July 2010                                                 doc.: IEEE 802.11-09/1272r2


                                Overview – 2
                                          (Extract)


 •    The Generic Advertisement Service (GAS), described in 5.9, can be used by a STA
      to provide support for the network selection process and as a conduit for
      communication by a non-AP STA with other information resources in a network
      before joining the wireless LAN.
 •    The Interworking Service supports Emergency Services (ES) by providing methods
      for users to access emergency services via the IEEE 802.11 infrastructure,
      advertising that emergency services are supported (see 11.23.6) and identifying that
      a traffic stream is used for emergency services.
 •    The Interworking Service provides QoS mapping for SSPNs and other external
      networks. Since each SSPN or other external network may have its own layer-3
      end-to-end packet marking practice (e.g., DSCP usage conventions), a means to re-
      map the layer-3 service levels to a common over-the-air service level is necessary.
      The QoS Map service provides STAs a mapping of network-layer QoS packet
      marking to over-the-air QoS frame marking (i.e., user priority).
 •    The SSPN Interface service supports service provisioning and transfer of user
      permissions from the SSPN to the AP. The method and protocol by which these
      permissions are transferred from the SSPN are out of scope of this standard.

Submission                                 Slide 22              George Bumiller, Research In Motion
July 2010                                                 doc.: IEEE 802.11-09/1272r2

                 Generic Advertisement Service - 1
             [Obtaining information from the AP without Association]
                                         (Extract)


 5.9 Generic Advertisement Service
 The Generic Advertisement Service (GAS) provides functionality that enables STAs to
 discover the availability of information related to desired network services, e.g.,
 information about services such as provided in an IBSS, local access services, available
 Subscription Service Providers (SSP) and/or SSPNs or other external networks. GAS
 uses a generic container to advertise network services' information over an IEEE
 802.11 network. Public Action frames are used to transport this information.
 While the specification of network services information is out of scope of IEEE 802.11,
 in an Infrastructure BSS there is a need for STAs to query for information on network
 services provided by SSPNs or other external networks beyond an AP, before they
 associate to the wireless LAN. The exchange of information may also be performed
 after associating to the BSS.
 In an IBSS, GAS functionality enables a STA to access the availability and information
 related to desired services provided by other STAs in the IBSS. Exchange of
 information using GAS may be performed either prior to joining an IBSS or after
 joining the IBSS.

Submission                                 Slide 23             George Bumiller, Research In Motion
July 2010                                                   doc.: IEEE 802.11-09/1272r2

                 Generic Advertisement Service - 2
             [Obtaining information from the AP without Association]
                                           (Extract)


 There are a number of reasons why providing information to a STA in a pre-associated
    state is beneficial:
       - It supports more informed decision making about an IEEE 802.11 infrastructure
         with which to associate. This is generally more efficient than requiring a non-AP
         STA to associate with an AP before discovering the information and then deciding
         whether or not to stay associated.
       - It is possible for the non-AP STA to query multiple networks in parallel.
       - The non-AP STA can discover information about APs that are not part of the same
         administrative group as the AP with which it is associated, supporting the selection
         of an AP belonging to a differ-ent IEEE 802.11 infrastructure that has an
         appropriate SSP roaming agreement in place.




Submission                                  Slide 24               George Bumiller, Research In Motion
July 2010                                                                      doc.: IEEE 802.11-09/1272r2
                  Table 7-43bk— Access Network Type
                                                      (Extract)

      Access           Meaning                                                 Description
   Network Type
             0    Private network          Non-authorized users are not permitted on this network. Examples of this network type
                                           are home networks and enterprise networks, which may employ user accounts. Private
                                           networks do not necessarily employ encryption.

             1    Private network with     Private network but guest accounts are available. Example of this network type is
                  guest access             enterprise network offering access to guest users

             2    Chargeable public net-   The network is accessible to anyone, however, access to the net-work requires payment.
                  work                     Further information on types of charges may be available through other methods (e.g.,
                                           802.21, http/https redirect or DNS redirection). Examples of this network type is a
                                           hotspot in a coffee shop offering internet access on a subscription basis or a hotel
                                           offering in-room internet access service for a fee.

             3    Free public network      The network is accessible to anyone and no charges apply for the network use. An
                                           example of this network type is an airport hotspot or municipal network providing free
                                           service.

             4    Personal Device Net-     A network of personal devices. An example of this type of network is a camera
                  work                     attaching to a printer, thereby forming a network for the purpose of printing pictures.

             5    Emergency Services       A network dedicated and limited to accessing emergency services.
                  Only Network

        6 to 13   Reserved                 Reserved

          14      Test or experimental     The network is used for test or experimental purposes only.

          15      Wildcard                 Wildcard network type

Submission                                             Slide 25                           George Bumiller, Research In Motion
July 2010                                           doc.: IEEE 802.11-09/1272r2

    Table 7-43bm—Advertisement Protocol ID definitions
                                       (Extract)




                                    Name                         Value

             Access Network Query Protocol                           0

             MIH Information Service                                 1

             MIH Command and Event Services Capability               2
             Discovery
             Emergency Alert System (EAS)                            3

             Reserved                                             4-220

             Vendor Specific                                       221

             Reserved                                              222-
                                                                   255

Submission                              Slide 26         George Bumiller, Research In Motion
July 2010                                                                      doc.: IEEE 802.11-09/1272r2
             Table 7-43bo—Access Network Query Protocol info ID definitions
                                                         (Extract)


                                       Info Name                        Info ID     ANQP Info
                                                                                  Element (clause)

                   Reserved                                             0-255           n/a
                   ANQP Capability List                                  256          7.3.4.2
                   Venue Name information                                257          7.3.4.3
                   Emergency Call Number information                     258          7.3.4.4
                   Network Authentication Type information               259          7.3.4.5
                   Roaming Consortium List                               260          7.3.4.6
                   IP Address Type Availability information              261          7.3.4.8
                   NAI Realm List                                        262          7.3.4.9

                   3GPP Cellular Network information                     263          7.3.4.10

                   AP Geo Location                                       264          7.3.4.11

                   AP Civic Location                                     265          7.3.4.12

                   AP Location Public Identifier URI                     266          7.3.4.13

                   Domain Name List                                      267          7.3.4.14

                   Emergency Alert Identifier URI                        268          7.3.4.15

                   TDLS Discovery                                        269          7.3.4.16

                   Reserved                                             270–            n/a
                                                                        56796

                   Access Network Query Protocol vendor-specific list   56797         7.3.4.7
                   Reserved                                             56798 –         n/a
                                                                         65535

Submission                                               Slide 27                     George Bumiller, Research In Motion
July 2010                                                            doc.: IEEE 802.11-09/1272r2

                  Interworking with External Network Procedures - 1
                                                  (Extract)



 11.23 WLAN Interworking with External Networks Procedures
 11.23.1 General
 This subclause describes the actions and the procedures that provide interworking capabilities between
 802.11 infrastructure and external networks.
 11.23.2 Interworking capabilities and information
 STAs indicate their support for Interworking Service by setting the dot11InterworkingServiceEnabled
 MIB variable to true. When dot11InterworkingServiceEnabled is true, APs include the Interworking
 element in Beacon and Probe Response frames and non-AP STAs include the Interworking element in
 Probe Request frames.
 When dot11InterworkingServiceEnabled. and dot11ExtendedChannelSwitchEnabled are both set to
 TRUE, the AP may provide its operating channel and regulatory class to an Interworked SSPN using the
 dot11RegulatoryClassesTable MIB entry.
 The Interworking information element contains signaling for Homogeneous ESSs. The HESSID is a 6
 octet MAC address which identifies the homogeneous ESS. The HESSID value shall be identical to one
 of the BSSIDs in the homogeneous ESS. Thus, it is a globally unique identifier, which in conjunction with
 the SSID, may be used to provide network identification for an SSPN.

 NOTE—It is required by this standard that the HESSID field in the Interworking element is
     administered consistently across all BSSs in a homogeneous ESS.
 The Interworking information element also provides a Network Type value in Beacon and Probe
     Response frames to assist the non-AP STA with network discovery and selection.
Submission                                        Slide 28                   George Bumiller, Research In Motion
July 2010                                                               doc.: IEEE 802.11-09/1272r2

                   Interworking with External Network Procedures - 2
                                                     (Extract)

 11.23.3 Interworking Procedures: Generic Advertisement Services
 This subclause describes the actions and procedures that are used to invoke Generic Advertisement Services
 (GAS). GAS may be used to enable network selection for STAs when dot11InterworkingServiceEnabled is true.
 GAS provides transport mechanisms for advertisement services while STAs are in the un-associated state as well
 as the associated state. This is accomplished via the use of Public Action management frames which are Class-1
 frames. GAS messages shall be transmitted using individually-addressed Public Action frames. When
 Management Frame Protection is negotiated, stations shall use individually addressed Protect-ed Dual of Public
 Action frames instead of individually addressed Public Action frames.
 A GAS message exchange may take place between two STAs; one STA transmits a GAS Query Request and the
 other STA transmits the GAS Query Response as described in 11.23.3.1. The Advertisement Protocol transported
 by the GAS is one of the query protocols in Table 7-43bl.
 GAS shall be supported by a STA when dot11InterworkingServiceEnabled is true. ANQP shall be supported by a
 STA when dot11InterworkingServiceEnabled is true. Other advertisement protocols shall be supported when the
 corresponding dot11GASAdvertisementID is present.
 STAs shall not transmit a GAS Query for any Advertisement Protocol unless that Advertisement Protocol ID is
 included in the Advertisement Protocol element in a Beacon or Probe response frame. The Advertisement Protocol
 element specifies the Advertisement Protocols that a STA may use to communicate with Advertise-ment Servers,
 which may be co-located with a STA or in an external network. The Advertisement Protocol identifies the query
 language used by the Advertisement Server. The GAS protocol, which is used to transport Queries and Query
 Responses, is transparent to the Advertisement Protocol.



Submission                                           Slide 29                    George Bumiller, Research In Motion
July 2010                                                         doc.: IEEE 802.11-09/1272r2

                 Interworking with External Network Procedures - 3
                                                (Extract)




 11.23.3.1 GAS Protocol
 Presence of the Interworking element in Beacon or Probe Response frames indicates support for the GAS
 pro-tocol. Presence of the Advertisement Protocol element in Beacon or Probe Response frames indicates
 the Ad-vertisement Protocol IDs supported in the BSS or IBSS. A STA transmits a GAS Query using a
 GAS Initial Request frame and the responding STA provides the query response or information on how to
 receive the que-ry response in a GAS Initial Response frame. The GAS Query Response shall be
 delivered in a single GAS Initial Response frame or in one or more GAS Comeback Response frames; the
 GAS Query Response shall not be split between a GAS Initial Response frame and one or more GAS
 Comeback Response frames. The GAS message sequence diagrams are shown in Figures 11-17e, 11-17f
 and 11-17g.




Submission                                       Slide 30                 George Bumiller, Research In Motion
July 2010                                                    doc.: IEEE 802.11-09/1272r2


                      Interactions with SSPN
                                            (Extract)




 11.23.4 Interworking Procedures: Interactions with SSPN
 11.23.4.1 General Operation
 To provide SSPN Interface services, the IEEE 802.11 network interacts with the SSPN
 corresponding to the user of the non-AP STA either directly or via a roaming relationship.
 As part of setting up the RSN security association, user policies are communicated to the
 AP. If dot11SSPNInterfaceEnabled is true, these permissions shall be stored in the AP's
 dot11InterworkingTableEntry for that STA. Thereafter, the AP shall use the
 dot11InterworkingTableEntry for controlling the service provision to that non-AP STA.
 User policies from the SSPN affect authentication, authorization, and admission control
 decisions at the AP. In addition, the AP collects statistics about the non-AP STA and reports
 the statistics to the SSPN when requested. The SSPN may also send service provision
 instructions to the AP, e.g., to terminate the connection to a non-AP STA. Non-AP STAs do
 not support the SSPN Interface.
 Network deployments typically provide that the AP and the server in the SSPN have a
 trustworthy channel that can be used to exchange information, without exposure to or
 influence by any intermediate parties. The establishment of this secure connection between
 the IEEE 802.11 infrastructure and the SSPN is out of scope of this standard.

Submission                                   Slide 31               George Bumiller, Research In Motion
July 2010                      doc.: IEEE 802.11-09/1272r2




     Your comments and suggestions are
           welcome and requested.



                  End

Submission          Slide 32        George Bumiller, Research In Motion

				
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