1. 1 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

2. 2 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

3. 3 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

4. 4 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 o The 802.11 radio may be in OFF state in this case o 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 o 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 o 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

5. 5 802.11 based Reference Network 802.21 IS Hot Spot #1 Hot Spot #N NAP Core Network NAP NOC AAA SSPN #2 Core Network 802.21 IS SSPN #2 NOC AAA SSPN #1 Core Network 802.21 IS SSPN #1 NOC AAA Internet Tunnel MIH Use 802.21 as Protocol for Network Selection

6. 6 802.21 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.

7. 7 802.21 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

8. 8 Information Element DescriptionComments General Network Information (List of Networks) Network TypeList of all Network types that are available in a particular area E.g., 802.11, 802.16, CDMA, UMTS Networks (Table-8) Operator Identifier Core Network IdentifierOperator Type + Operator name Service Provider Provider of servicesService (such as VoIP) Provider name (May not be applicable in all cases) Information Elements-1

9. 9 Information Element DescriptionComments Access Network specific Information Access Network Identifier Used to uniquely identify access network. For example ESSID in case of 802.11 Roaming PartnersRoaming partners that have agreement with Access Network operator SSPN partners for 802.11 Network Standards Access Network specific applicable revisions to base standards (a/b/e/g/i/k/n/p/r/s/t/u/v/….) CostCost of accessing the networkCurrency+Unit+Value+Service-Info (Table-10) SecurityAuthentication Methods and Cipher Suites QoSPacket Transfer Delay (Min/Max/Avg) Jitter Packet Loss Rate Packet Error Rate Information Elements-2

10. 10 Information Element DescriptionComments PoA specific Information AddressMAC AddressBSSID LocationPoA locationSee Table 11,12,13 Data RateMin-Max Range Channel Range Spectrum Range Subnet Information List of subnets to which PoA belongs PoA Capabilities Services Supported IP Config Methods DHCP, etc. Information Elements-3

11. 11 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

12. 12 What 802.11 Information should be stored 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)

13. 13 (4) (1) VER Ack (1) Reserved (10) MIH Message ID (16) Transaction ID (16) Variable Load Length (16) SID (4) Opcode (2) Action ID (10) MIHF VaVariable Header (contains Header Identifiers in TLVformat) MIHF Payload (contains other service specific TLVs) Rsp Ack Req Octet 1 Octet 2Octet 3 Octet 4 MIHF Header MIHF Variable Fixed Load F MIHF Fixed Header MIHF Variable Header MIHF Payload MIH Function Frame MIHF Protocol

14. 14 Field NameSize (bits) Description Version40: Not used, 1: Current Version, 2-15 Reserved ACK_Req1Request an Acknowledement (N/A for 802.11) ACK_Rsp1Respond to Acknowledgement (N/A for 802.11) Reserved10 MIH Message ID - Service Id (SID) - Operation Code (Opcode) - Action Identifier (AID) 16 4 2 10 Combination of following three bit-fields 1: System Mgmt 2: Event Service 3: Command Service 4: Information Service 1: Request, 2:Response, 3:Indication Specific Action to be taken Transaction ID16To match Requests and Response Variable Load Length16Total length of Variable load field MIHF Protocol – Fixed Header

15. 15 Variable Header fields (Optional) Session Identifier MIHF Identifier MIHF Protocol – Variable Header

16. 16 MIHF IS Query Request Ver (0)Ack (0)Reserved (0)Rsp (0)SID (4)OpCode (1)AID (21) Transaction IdentifierPayload Length MIH_Get_Information.Request -- IS Info Query Type -- IS Query Parameters Type = 4Length = 1Value = 1 (TLV) Fixed Header Payload Information Service Request MIH_Get_Information IS Info Query Type Type= 36Length = ?Value = 1 (TLV Parameters) IS Query Parameters: Location, Span/Radius, etc.

17. 17 MIHF IS Query Response Ver (0)Ack (0)Reserved (0)Rsp (0)SID (4)OpCode (2)AID (21) Transaction IdentifierPayload Length MIH_Get_Information.Response -- IS Info Query Type -- IS Response Parameters Type = 4Length = 1Value = 1 (TLV) Fixed Header Payload Information Service Response MIH_Get_Information IS Info Query Type Type= 37Length = ?Value = 1 (TLV Parameters) IS Response Parameters…..

18. 18 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 MIHF Supported TLV Query Types

19. 19 TGu- Query Examples 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)

20. 20 TGu - Query Examples (cont.) 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

21. 21 AP to 802.21-IS Protocol Issues 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

22. 22 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 Event Service

23. 23 NoEvent NameDescriptionNew MLME Primitive 1Link UpL2 Connection establishedExists 2Link DownL2 Connection is brokenN/A 3Link Going Down L2 connection breakdown imminentMay be Needed 4Link DetectedNew L2 link has been foundN/A 5Link Parameters Change Change in specific link parameters has crossed pre-specified thresholds (Link Speed, Quality metrics) May be Needed 6Link Event Rollback Event rollbackMay be Needed 7Link SDU Transmit Status Improve handover performance through local feedback as opposed to waiting for end-to- end notifications N/A 8Link Handover Imminent L2 intra-technology handover imminent (subnet change). Notify Handover information without change in link state. May be Needed (TGr may be covering this) 9Link Handover Complete Notify Handover stateMay be Needed Link Layer Events

24. 24 Next Steps

25. 25 Backup