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BSS Transition with Bearing

BSS Transition with Bearing. Authors:. Date: 2009-11-17. Abstract. This proposal is submitted as a solution to SB CID#7355400023 Today many clients have the capability to determine bearing (direction) to aid with navigation

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BSS Transition with Bearing

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  1. BSS Transition with Bearing Authors: Date: 2009-11-17 Allan Thomson, Cisco Systems

  2. Abstract This proposal is submitted as a solution to SB CID#7355400023 Today many clients have the capability to determine bearing (direction) to aid with navigation This proposal leverages that capability to improve client roaming behavior Allan Thomson, Cisco Systems

  3. The problem… • BSS Transition Management provides information to the client to aid client roaming • Today the Neighbor Report element included in the BSS Transition Management Request frame includes BSSID, Reg Class, Channel and various additional sub-elements related to the BSSID • One such sub-element is BSS Transition Preference • This indicates the relative preference from the “network-side” of what APs should be considered by the client for roaming to • This information is not based on what the client is actually doing • For clients that are in motion and have bearing information, there is no information available from the network that indicates which APs are in the path of the client • Therefore AP provided preferences cannot always help clients while in motion Allan Thomson, Cisco Systems

  4. The solution… • Provide a mechanism for the AP network to notify STAs for each AP neighbor the relative bearing of AP neighbors from the AP reporting the information • Therefore allowing the STA to choose an appropriate AP transition if that STA knows its direction while in motion Allan Thomson, Cisco Systems

  5. Example #1 • Associated AP12 reports preferred transition candidates: • AP7 (0degs) • AP8 (20degs) • AP13 (25degs) • AP6 (340 degs) • AP11 (320degs) • …etc • Client knows 0 == North • Client knows that it is facing/moving bearing 22degs • Client chooses AP8 or AP13 Allan Thomson, Cisco Systems

  6. Example #2: Client same distance from AP12 but different position • Client could be anywhere on the grey circle • AP12 continues to report same transition information as Example 1 • Client still knows that it is moving towards 22degs • Client chooses AP neighbors based on direction of travel Allan Thomson, Cisco Systems

  7. Solution Details • Add new Bearing sub-element to Neighbor Report Allan Thomson, Cisco Systems

  8. Sub-element Details • Single field indicating Bearing • Bearing indicates the direction of the neighbor in degrees relative to the reporting BSS and in relation to true north Allan Thomson, Cisco Systems

  9. Questions ? Allan Thomson, Cisco Systems

  10. Motion • Move to incorporate the normative text in 09/1129r0 into the TGv draft • Yes: • No: • Don’t care: Allan Thomson, Cisco Systems

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