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802.11k Radio Resource Measurements

19.4.2005. TUT: 83180 Wireless LANs. 2. Outline. Introduction802.11k measurementsHow it worksConclusions Current status of 802.11kReferences. 19.4.2005. TUT: 83180 Wireless LANs. 3. Introduction. Task group k launched in late 2002Define radio resource measurement (RRM) parameters for network m

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802.11k Radio Resource Measurements

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    1. 19.4.2005 TUT: 83180 Wireless LANs 1 802.11k Radio Resource Measurements Kai Törmä

    2. 19.4.2005 TUT: 83180 Wireless LANs 2 Outline Introduction 802.11k measurements How it works Conclusions Current status of 802.11k References

    3. 19.4.2005 TUT: 83180 Wireless LANs 3 Introduction Task group k launched in late 2002 Define radio resource measurement (RRM) parameters for network management and performance enhancement provide mechanisms to higher layers for radio and network measurements

    4. 19.4.2005 TUT: 83180 Wireless LANs 4 802.11k Measurements Make measurements from layer 1 and 2 of OSI protocol stack Statical Measurement Characterize the radio environment in long-term statistical sense Identity Measurements Identify stations that affect each other’s performance

    5. 19.4.2005 TUT: 83180 Wireless LANs 5 802.11k measurements Channel Load Noise Histogram Beacon Frame Hidden Node Medium Sensing Time Histogram STA Statistics Transmit power control (802.11h) These are addition to the power measurements that were defined in 802.11h.These are addition to the power measurements that were defined in 802.11h.

    6. 19.4.2005 TUT: 83180 Wireless LANs 6 Roaming decision APs can provide a site report to clients APs collects data with beacon frames and will analyse it AP generates an ordered list of access points, from best to worst service, called a site report AP asks with beacon request a client repots all the access point beacons it hears.AP asks with beacon request a client repots all the access point beacons it hears.

    7. 19.4.2005 TUT: 83180 Wireless LANs 7 Channel selection Currently APs and clients cannot share channel information With 802.11k Noise histogram Channel load Time histogram -> AP will know is the channel quality good enough

    8. 19.4.2005 TUT: 83180 Wireless LANs 8 Hidden nodes Clients or APs that other clients or access points can’t hear With 802.11k Clients track hidden nodes and access points query clients with those lists APs knows now about clients who are on the edge of their cells

    9. 19.4.2005 TUT: 83180 Wireless LANs 9 Client statistics Currently are limited to statistics APs maintain With 802.11k 802.11 MAC statistics Counts of MSDUs/MPDUs received/transmitted Counts of Channel utilization in rx & tx direction Data rate & modulation of last rx and tx RSSI, RCPI, and signal quality Etc. -> More complete view of network performance

    10. 19.4.2005 TUT: 83180 Wireless LANs 10 How it works Client is moving away AP1, so AP1 informs the client prepare to move to another access point The Client asks the AP1 to provide it with a list of preferred access points nearby AP1 responds with a site report Client moves to the channel of best access point listed in the site report and connects it

    11. 19.4.2005 TUT: 83180 Wireless LANs 11 Benefits Simplify WLAN radio configuration Enable better diagnostics of problems Using info that is easy and cheap to gather Enable new services Location based services Voice Over IP (VOIP) Enable better frequency planning, optimize network performance Enable automatic frequency planning Better traffic distribution

    12. 19.4.2005 TUT: 83180 Wireless LANs 12 Changes to STAs Wireless MAC message protocol Build upon 802.11h mechanisms and measure frames add RRM capability bit and RRM action frame type MAC firware Handle new management frames in the wireless MAC protocol Compute measurement payloads form PHY registers and traffic

    13. 19.4.2005 TUT: 83180 Wireless LANs 13 Conclusions Better wireless performance and management Better Observation of Access point Better Client performance Take Environmental data into consideration

    14. 19.4.2005 TUT: 83180 Wireless LANs 14 Conclusions Measurements necessary for future wireless growth Future technologies require more measurement Once ratified, 802.11k would help IT build a better WLAN

    15. 19.4.2005 TUT: 83180 Wireless LANs 15 802.11k status Mar 05 2nd Letter Ballot in Progress Currently Expect to go to Sponsor Ballot Summer or Fall 05 Expect to be a standard by the end of 05 or early 06

    16. 19.4.2005 TUT: 83180 Wireless LANs 16 References Radio resource measurements (11k) intro IEE 802.11-05/0184r0 [ftp://ieee:wireless@ftp.802wirelessworld.com/11/05/11-05-0184-00-000k-radio-resource-measurement-11k-intro.ppt] Technical article: Demystifying IEEE 802.11 for industrial wireless lans [http://wireless.industrial-networking.com/articles/articledisplay.asp?id=225] Searchmobilecomputer.com 802.11k [http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci999671,00.html] 802.11k makes WLANs measure up [http://www.nwfusion.com/news/tech/2004/0329techupdate.html] Which 802.11 standards will actually make a difference? [http://www.techworld.com/mobility/features/index.cfm?fuseaction=displayfeatures&featureid=1065&page=1&pagepos=1] Developements of IEEE 802.11 technology [http://www.electronics.dit.ie/staff/mdavis/EI_talk_summary.pdf] An adaptive approach to wireless network performance optimization [http://www.intel.com/technology/magazine/communications/wi02043.pdf]

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