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Enablement in 5GHz for FILS

Enablement in 5GHz for FILS. Authors:. Date: 2011-11-07. Abstract. Ideas on Fast Initial Link Set-Up within the 5GHz band via enablement on a different channel. To be used to stimulate discussion in joint 802.11 REG/ ai session. The Goal.

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Enablement in 5GHz for FILS

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  1. Enablement in 5GHz for FILS Authors: Date: 2011-11-07 Marc Emmelmann, FOKUS

  2. Abstract Ideas on Fast Initial Link Set-Up within the 5GHz band via enablement on a different channel. To be used to stimulate discussion in joint 802.11 REG/ai session Marc Emmelmann, FOKUS

  3. The Goal • Understand the idea to expedite AP discovery in 5GHz • Discuss the design space under the constrain to have a solution which does not interfere with “primary users” • Do not limit the design scope by a country-specific regulation. Rather consider options enabling different approach in a “region-specific” manner • Understand the limitations of regulation in certain countries as they exist today Marc Emmelmann, FOKUS

  4. Idea • 5GHz part operates “as known”  Master device w/ channel sensing • 2.4GHz part asks 5GHz part which channel are in use (or is told)  „real time synchronization of that shared knowledge“ • Non-AP STA conducts active scanning in 2.4GHz band  receives valid 5GHz channel list • Option a) verify this information via passive scanning on specific 5GHz channel • Option b) directly start link set-up on 5GHz channel • Continue w/ regular 5GHz operation Optional passive scan on channel for verification Active scan  receive 5GHz channel list Single Device / Box Link-Set Up 2.4 GHz AP 5 GHz AP Internal Mgmt. Not accessible by user Non-AP STA2.4 & 5 GHz operation • Non-AP STA is under the control of the master (single device) • Open issues: • Enabling signal is not received in 5GHz channel • Different propagation characteristics of different frequency bands  larger tranmissionrange of 2.4GHz as compared to 5GHz Marc Emmelmann, FOKUS

  5. Enabling signal not received in 5GHz band • Not a technical issue; constrains imposed by regulation • FCC 15.202: “… Master devices marketed within the United States must be limited to operation on permissible part 15 frequencies. ...“ • Europe: Not sure; could not find a similar statement. Just the “operation under the control of a master” is required. • Possible approach: specify standard for this feature to work only in specific regulatory domains (per given annex). • Does not matter if we “verify” via passive scanning • as in this case, it is legally not an enabling-signal but a hint where to look for the beacon. • Enablement is legally done via beacon reception as today • BUT: Could work with FCC constrains if enabling signal is received in any 5GHz channel Is my under-standing of 15.202 correct? Marc Emmelmann, FOKUS

  6. Different transmission ranges of 2.4 & 5GHz • This is a severe technical issue. We might receive an enabling signal at a distance far away from the master device (AP) which is not covered by the sensing requirements for 5GHz operation • If legislation says that a slave (non AP-STA) must not emit any radiation unless the controlling master device has verified that operation in a specific frequency is permissible (at the location of the slave), we will have to verify via passive scanning. • Are there other concepts, e.g. database-based information, that can be used (also for operation in other bands i.e. TVWS) ? My understanding is that Europe and US are to restrictive Marc Emmelmann, FOKUS

  7. Summary • Statements to be verified based on discussion w/ 802.11 REG • “enablement” outside the frequency band of concern (here 5GHz) requires • Verification via passive scanning for 5GHz operation (sensing based detection of primary) due to • Different propagation range of signal • Regulatory requirements • May work for database-based approaches  Talk to 11af • „Enablement“ inside the 5GHz frequency band seems to be possible; not verification via passive scanning required. Marc Emmelmann, FOKUS

  8. References • http://www.unwantedemissions.com/47cfr/current/47CFR015.pdf • FCC TCB slidesdiscussing FCC KDB 59428 • http://www.fcc.gov/oet/ea/presentations/files/apr11/3b.SoftwareConfigurationControl-RDJS.pdf • FCC KDBs 594280 and 178919 are about permissible changes and client devices • http://transition.fcc.gov/oet/ea/eameasurements.html • is a list of KDBs regarding testing procedures • http://transition.fcc.gov/oet/ea/presentations/files/oct11/3RF-Exposure-Procedures-Update-102611-KC.pdf • is a presentation on RF Exposure Procedures  Marc Emmelmann, FOKUS

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