Considerations about Network Selection Month 2000 doc.: IEEE 802.11-00/xxx July 2004 Considerations about Network Selection Eleanor Hepworth, Siemens Roke Manor Stefan Berg, Siemens Wolfgang Gröting, Siemens Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

Month 2000 doc.: IEEE 802.11-00/xxx July 2004 What’s the Problem? Need to provide the terminal with information to choose the appropriate network In general, at different times (while attaching to a network) the information can be provided Pre-association Post-association/pre-authentication Post-authentication NOW Let‘s focus on ‚pre-association’ and… …have a closer look on the information itself Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

A user scenario – without network advertisements July 2004 A user scenario – without network advertisements Hotspot #1 Internet No Real time support 4. Start VoIP session 2. Start VoIP Application AP 1. Advertise Network identifier User 6.Stop VoIP session Hotspot #2 Real Time support 2. Advertise Network identifier 3. Connect to Hotspot #1 (wild guess) 5. User unsatisfied with Quality 7. Re-Start VoIP session AP Eleanor Hepworth, Siemens Roke Manor

A user scenario – with network advertisements (e.g. QoS) July 2004 A user scenario – with network advertisements (e.g. QoS) Hotspot #1 No Real time support Internet 2. Start VoIP Application AP 1. Advertise Network identifier, no real time support User Hotspot #2 1. Advertise Network identifier Real Time support 5.Start VoIP session with real time support 3. Evaluate application requirements & user preferences 4. Chose Hotspot #2, since its support real time services 6.  User … AP  Better user experience, reduced application delay, reduced signalling over the air Eleanor Hepworth, Siemens Roke Manor

What Information would be useful? Month 2000 doc.: IEEE 802.11-00/xxx July 2004 What Information would be useful? Network Identification Roaming Agreements Costs for Network Usage Authentication Mechanisms E2E QoS / Bearer Service Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

Only Network Identification or even more? Month 2000 doc.: IEEE 802.11-00/xxx July 2004 Only Network Identification or even more? Mandatory for network identification purpose Pre-association; beacon and/or probe Current Practice: The SSID is used to advertise the network identity Data-Format SSID: 32byte But: Which identity needs to be advertised? Can other network characteristics be derived from the identifier? A structured SSID namespace could provide additional information and support network selection e.g. this is a public or private hotspot, 3GPP interworking/roaming capabilities, etc Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

What about Roaming Agreements? Month 2000 doc.: IEEE 802.11-00/xxx July 2004 What about Roaming Agreements? Mandatory for authentication purpose Reasonably pre-association; beacon and/or probe Motivation: Indicate all supported roaming partners STA impact: new mechanism to transfer and evaluate the information Amount of data: 10s or 100s of bytes Assuming 10 roaming partners example data formats could be: ASCII coded NAI-realms ITU-T E.212 mobile country codes 36bytes * 10 = 360bytes 3bytes * 10 = 30bytes e.g. vodafone.com, t-mobile.com NAI max. 72byte (RFC2486) e.g. 262-01 = T-Mobile Germany Needs administration + conversion Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

Do we need Charging Information? Month 2000 doc.: IEEE 802.11-00/xxx July 2004 Do we need Charging Information? Optional, it’s nice to know about the cost of using the network Preferably pre-association; beacon and/or probe STA impact: new mechanism to transfer and evaluate the information Many, many options; could be a large list with quite an amount of data Amount of data: 10s or 100s of bytes Example data formats for AP and 10 roaming partners: Extended set of charging information: currency, type, amount, units, formats, … Reduced set of 4 charging classes and 4 different charging modes (data, time, service, flat) 44bytes * 11 = 440bytes 1bytes * 11 = 11bytes Detailed charging information Only a vague hint on costs Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

What about Authentication Mechanisms and new user signup services? Month 2000 doc.: IEEE 802.11-00/xxx July 2004 What about Authentication Mechanisms and new user signup services? Mandatory for authentication purposes and helpful for new user signup support Preferably pre-association; beacon and/or probe WPA/802.1X is already advertised: privacy bit is set or not In case of UAM: indication needed on subscriber selection support STA impact: new mechanism to transfer and evaluate the information Amount of data: 10s of bytes Example data formats for AP and 10 roaming partners: Indication of new user registration possibility Additional information, payment methods, authentication method 1bit * 11 = 11bit 2bytes * 11 = 22bytes Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

What about end-2-end QoS? Month 2000 doc.: IEEE 802.11-00/xxx July 2004 What about end-2-end QoS? Optional for bearer service selection Pre-association; beacon and/or probe Motivation: 802.11e realizes only over the air QoS Provide a hint on network capabilities (QoS classes) Provide information on supported QoS mechanisms STA impact: new mechanism to transfer and evaluate the information Amount of data: 10s of bytes Example data formats for AP and 10 roaming partners: 4 different QoS classes (e.g. 3GPP: conversational, streaming, interactive, background) Additional information on 4 different QoS mechanisms 4bit * 11 = 44bit 1byte * 11 = 11byte Eleanor Hepworth, Siemens Roke Manor John Doe, His Company

Conclusions and Proposal Month 2000 doc.: IEEE 802.11-00/xxx July 2004 Conclusions and Proposal Mandatory information and its characteristics have been identified Proposal: Use the information outline here in establishing formal requirements for network selection and … … identify, what is feasible to advertise pre-association Questions: Are there any other things that people feel should be included? Eleanor Hepworth, Siemens Roke Manor John Doe, His Company