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Measurement Request and Report for Link Margin Information

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Presentation on theme: "Measurement Request and Report for Link Margin Information"— Presentation transcript:

1 Measurement Request and Report for Link Margin Information
March 2003 Measurement Request and Report for Link Margin Information Tae-Jin Lee, Duck-Yong Yang SungKyunKwan University (SKKU) Kyunghun Jang Samsung Advanced Institute of Technology (SAIT) July 2003 Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

2 Motivation Multiple Dwelling Unit Scenario 8 (k-03/465r2)
Densely populated WLANs in Home/Apt./Office Environment Mutual interference between BSSs Unexpected rogue APs Unauthorized access by STAs in near BSSs Unnecessary power consumption of APs Tae-Jin Lee, SungKyunKwan University

3 Ex: Multiple Dwelling Unit Scenario
Home1 Home2 STA1 STA4 STA5 AP2 STA2 AP1 STA6 STA3 Beacon range (Maximum) Data range (Optimum) Tae-Jin Lee, SungKyunKwan University

4 Link Characteristics Link characteristics in multiple dwelling unit scenario Variation of channel quality Interference between BSSs, Fading Change of neighbor environment Change of operation condition or QoS Variation of coverage range Need to collect appropriate information for the scenario To manage the scarce radio resources more efficiently and to adjust various QoS levels Transmission power or data rate Link Margin Tae-Jin Lee, SungKyunKwan University

5 Link Margin Information
March 2003 Link Margin Information Link Margin Ratio of the received signal power to the minimum desired signal power by the STA Implies the very useful characteristics for the scenario 8 Distance and Channel quality Receiver requirement Changes over time and affected by various factors Location of STAs (path loss) Channel quality (fading) Number of adjacent BSSs Required minimum data rate Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

6 Measurement of Link Margin Information
March 2003 Measurement of Link Margin Information Link Margin Fractions: Lower Minimum Link Margin Fraction ( < min. Link Margin) Lower Desired Link Margin Fraction ( min. Link Margin <= x < des. Link Margin) Upper Desired Link Margin Fraction ( <= des. Link Margin) Detail dynamic characteristics of Link Margin Average Link Margin: Average ratio of the received signal power to the minimum desired signal power by the STA during the Measurement Duration Rather overall average Link Margin Range of values signed integer in dB scale Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

7 Management Action Frame in TGk
March 2003 Management Action Frame in TGk Type : Management (00) Subtype : Action (1101) Frame control Frame body M. Request/Report frame of TGk (M. Request frame only) Category Action Dialog Token Activation delay Measurement offset Measurement Request/Report element TGk=3 M.REQ=0 M.REP =1 Beacon의 경우는 frame body에 18개의 Fixed field. Action의 경우 frame body에? Activation Delay indicates the number of TBTTs to skip before executing the first request element Measurement Offset indicates the start time offset within the beacon interval Measurement Request elements are processed sequentially and executed in series or in parallel Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Request/Report … Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Request/Report … Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Request/Report Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

8 Info. Element and Measurement Type
Measurement Report frame format Category Action Dialog Token Measurement Report Elements Element ID=39 Length Measurement Token M.Report Mode Measurement Type Measurement Report Octets:1 1 variable Element ID=39 Length Measurement Token M.Report Mode Measurement Type Measurement Report Octets:1 1 variable TGk Info. Element TGk Measurement type Information Element Element ID Measurement Request 38 Measurement Report 39 AP Channel Report 40 Site Report 41 Measurement Name Measurement Type Unused 0-2 Channel Load Report 3 Noise Histogram Report 4 Beacon Report 5 Frame Report 6 Hidden Node Report 7 Medium Sensing Time Histogram Report 8 Link Margin Information Report 9 Reserved 10-255 Tae-Jin Lee, SungKyunKwan University

9 M. Request for Link Margin Information
Frame body Measurement Request frame of TGk Category Action Dialog Token Activation delay Measurement offset Measurement Request element TGk=3 M.REQ=0 Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Request … Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Request … Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Request M.Request=38 Link Margin Information=9 Channel Number Channel Band Measurement Duration Minimum Link Margin Desired Link Margin 1 2 Tae-Jin Lee, SungKyunKwan University

10 M. Report for Link Margin Information
Frame body Measurement Report frame of TGk Category Action Dialog Token Measurement offset Measurement Report element TGk=3 M.REP=1 Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Report … Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Report … Element ID Length Measurement Token Measurement Mode Measurement Type Measurement Report Link Margin Information=9 M.Report=39 Channel Number Channel Band Measurement Duration Minimum Link Margin Desired Link Margin Lower Minimum Link Margin Fraction Lower Desired Link Margin Fraction Upper Desired Link Margin Fraction Average Link Margin 1 2 Tae-Jin Lee, SungKyunKwan University

11 Advantages of Using Link Margin Information
March 2003 Advantages of Using Link Margin Information Need to provide WLAN with effective “cell engineering” Reduce interference between neighbor BSSs Tackle rogue APs and/or near-proximity APs Provide physical access to authorized STAs only Save unnecessary TX power of APs Maintain optimal coverage area for authorized STAs Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

12 Simulation Result BSS1 1 3 4 2 BSS2 AP1 8 7 AP2 6 5
8 7 AP2 6 5 Tae-Jin Lee, SungKyunKwan University

13 Summary of Proposed Text
Add measurement request/report for Link Margin Information Use the same Action field as in TGk Draft Define a new Measurement Type Link Margin Information Link Margin Fractions Average Link Margin STAs report Link Margin Information in the specified channel over the Measurement Duration STAs measure the Link Margin Information periodically or as necessary Tae-Jin Lee, SungKyunKwan University

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