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IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-0816-00-0000 Title: 802.21 – TGu Joint Discussions Date Submitted: November, 2006 Presented at IEEE 802.21 session #17 in Dallas, Texas. Authors or Source(s): Vivek Gupta Abstract: Inputs from 802.21 to questions from TGu. TGu Inputs.

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IEEE 802.21 MEDIA INDEPENDENT HANDOVER

DCN: 21-06-0816-00-0000

Title: 802.21 – TGu Joint Discussions

Date Submitted: November, 2006

Presented at IEEE 802.21 session #17 in Dallas, Texas.

Authors or Source(s):

Vivek Gupta

Abstract: Inputs from 802.21 to questions from TGu


Tgu inputs
TGu Inputs

  • 11-06-1492-00-000u tgu-802-21-joint-session-update-tgu-network-selection-mih-support

  • 11-06-1543-00-000u-planning-november-2006-joint-session-between-802-21-and-802-11u


Discussion items
Discussion Items

  • Information Service

    • List of IEs

    • Query Language

    • Static/Dynamic IEs

    • State 1 vs State 3 query

    • Maximum message length in State 1 Issues

  • MIH Events

    • MLME implications

  • Security Implications

  • Next Steps


Network discovery selection for 802 11
Network Discovery & Selection for 802.11

  • Applicable in two cases:

    • When MN is ALREADY connected to some other network and needs to Handover an existing connection to 802.11

      • The 802.11 radio may be in OFF state in this case

      • When evaluating 802.11 networks the Network Selection entity (in MN or Network) may need to know more about 802.11 network properties even before deciding to Power On the 802.11 radio

      • 802.21 IS can provide these properties

    • When MN is NOT connected to any network and needs to select an appropriate 802.11 network to connect to

      • 802.11 may be the DEFAULT radio to connect to on Power up or 802.11 may be the only network coverage available in that area


802 11 based reference network
802.11 based Reference Network

NAP NOC

SSPN #1 NOC

802.21 IS

AAA

802.21 IS

AAA

SSPN #1Core Network

MIH

MIH

SSPN #2 NOC

Tunnel

NAPCore Network

Internet

802.21 IS

AAA

Tunnel

SSPN #2Core Network

Hot Spot #1

Hot Spot #N

Use 802.21 as Protocol for Network Selection


802 21 information service
802.21 Information Service

  • Multiple Networks of different Network_Type may be available in a particular geographical area:

    • 802.11, 802.16, Cellular

  • For each Network_Type (such as 802.11) there may be several operators, providing several instances of a particular Network_Type

    • Operator_A, Operator_B, etc. may all have 802.11 network

    • The properties of these network instances may be different

      • 802.11 Network Standards they support (.11a/b/e/g/i/n/p/r/s/u/v…)

      • Cost, Security, Roaming Agreements etc. for these networks may be different

  • For each of the above Network Instance, there are different PoAs (APs for 802.11)

    • The properties of these APs may differ

    • Location, Subnet Information, Capabilities, etc.


802 21 information service1
802.21 Information Service

List of Access Network Types

(802.11, 802.16, Cellular)

Access Network Properties

802.11 Network from Operator_A 802.11 Network from Operator_B 802.16 Network from Operator_A 802.16 Network from operator_C

PoA Specific Properties

Properties of each AP/BS





What 802 11 information should be stored in 802 21 information server
What 802.11 Information should be stored in 802.21 Information Server?

  • Guiding principles

    • Put the minimum information needed by STA for network selection and network identification—minimizes synchronization problems between configuration of 802.11 AN and 802.21-IS database

    • Include support for two types of queries:

      • Remote query (state 3 query): I’m in San Francisco and want to find out what hotspots are in Melbourne

      • Local query (state 1 query): I can see 3 hotspots now, which one is the best to associate with?

    • 802.21 IS does NOT distinguish between Access Network States

    • Do not include 802.11 AN dynamic information; examples include:

      • Channel number,

      • Transmit power

      • Traffic Load

    • None of the above are included in IS


What 802 11 information should be stored in 802 21 information server cont
What 802.11 Information should be stored Information Server?in 802.21 Information Server (cont.)?

  • Fundamental binding provided by 802.21-IS

    • SSPN to WLAN

    • WLAN identified by {SSID, ESSID} (Supported)

  • Recommended information to store in 802.21 database:

    • SSPN name/realm (Is this same as Operator Identifier?)

    • SSPN roaming partners (Supported)

    • Interworking services by SSPN (including emergency services) (Supported)

    • 802.11 AN parameters:

      • Location

      • Country/regulatory domain

      • {SSID, ESSID}

      • PHY types supported

      • 802.11e QoS support

        (Supported Phy types can be obtained from Network_Standards)


Opcode Information Server?

Action ID

SID

(4)

(10)

(2)

Octet 4

Octet 1

Octet 2

Octet 3

Ack

Ack

VER

Reserved

MIH Message ID

(4)

Req

(1)

Rsp

(10)

(16)

(1)

MIHF

Fixed

T

r

ansaction ID

V

a

riable Load Length

Header

(16)

(16)

MIHF V

a

Variable Header

(contains Header Identifiers in TL

V

format)

MIHF

V

a

riable

Load

MIHF Payload

(contains other service specific TL

V

s)

MIHF Protocol

MIHF Payload

MIHF Fixed Header

MIHF Variable Header

MIH FunctionFrame

F


MIHF Protocol – Fixed Header Information Server?


MIHF Protocol – Variable Header Information Server?

  • Variable Header fields (Optional)

    • Session Identifier

    • MIHF Identifier


MIHF IS Query Request Information Server?

MIH_Get_Information.Request

-- IS Info Query Type

-- IS Query Parameters

Information Service

MIH_Get_Information

Request

Fixed Header

Ver (0)

Ack (0)

Rsp (0)

Reserved (0)

SID (4)

OpCode (1)

AID (21)

Transaction Identifier

Payload Length

Payload

IS Info Query Type

Type = 4

Length = 1

Value = 1 (TLV)

Type= 36

Length = ?

Value = 1 (TLV Parameters)

IS Query Parameters: Location, Span/Radius, etc.


MIHF IS Query Response Information Server?

MIH_Get_Information.Response

-- IS Info Query Type

-- IS Response Parameters

Information Service

MIH_Get_Information

Response

Fixed Header

Ver (0)

Ack (0)

Rsp (0)

Reserved (0)

SID (4)

OpCode (2)

AID (21)

Transaction Identifier

Payload Length

Payload

IS Info Query Type

Type = 4

Length = 1

Value = 1 (TLV)

Type= 37

Length = ?

Value = 1 (TLV Parameters)

IS Response Parameters…..


MIHF Supported TLV Query Types Information Server?

  • TLV Containers

    • List of Access Networks Container

      • TYPE_CONTAINER_LIST_OF_NETWORKS

    • Access Network Container

      • TYPE_CONTAINER_NETWORK

    • PoA Container

      • TYPE_CONTAINER_POA

  • Other Query parameters

    • Client Location

    • Radius of interest for networks

  • Queries

    • Any IE can be queried.

    • Any number of IEs can be queried in same request


Tgu query examples
TGu- Query Examples Information Server?

  • What WLANs support my subscriptions?

    • STA: provides list of subscriptions

    • 802.21-IS: provides list of {SSPN, SSID, ESSID} where SSPN’s includes roaming partners

    • Need to add

  • Is emergency service supported on this WLAN?

    • STA: provides ESSID(s)

    • 802.21-IS: provides list of {SSPN, SSID, ESSID}

    • Need to add

  • What interworking services are supported on this WLAN?

    • STA: provides ESSID(s)

    • 802.21-IS: provides list of {SSPN, SSID, ESSID, interworking services}

    • Supported (PoA capabilities IE)


Tgu query examples cont
TGu - Query Examples (cont.) Information Server?

  • Is VoIP services provided on this WLAN?

    • STA: provides ESSID(s)

    • 802.21-IS: provides list of {SSPN, SSID, ESSID} which support VoIP

    • Note that VoIP is just an example; query could be for any interworking service

    • Need to add

  • I’m traveling to Melbourne, what hotspots are located there?

    • STA: provides location (latitude, longitude), search radius

    • 802.21-IS: provides list of {SSPN, SSID, ESSID}

    • This could potentially generate a lengthy query response

    • Supported


Ap to 802 21 is protocol issues
AP to 802.21-IS Protocol Issues Information Server?

  • Mechanism to limit size of Query Response

    • Important only when client is in state 1

    • When client is in state 3, any query response length is acceptable

  • Mechanism to identify final fragment of a multi-fragment Query Response


Event Service Information Server?

  • Link Layer Events

  • MIH Events

    • Can be local or remote

    • Remote MIHF entity has to subscribe for events it is interested in

    • Delivery through MIHF protocol


Link Layer Events Information Server?


Next steps
Next Steps Information Server?


Backup
Backup Information Server?


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