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MAC simulation results for Dynamic sensitivity control (DSC - CCA adaptation) and transmit power control (TPC). Date: 2014-04-17. Authors:. Context. In dense environments, CSMA-CA parameters (especially CCA physical carrier sensing) as defined in the standard are quite conservative.

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MAC simulation results for Dynamic sensitivity control (DSC - CCA adaptation) and transmit power control (TPC)

Date: 2014-04-17

Authors:

Imad Jamil (Orange)


Context
Context - CCA adaptation) and transmit power control (TPC)

  • In dense environments, CSMA-CA parameters (especially CCA physical carrier sensing) as defined in the standard are quite conservative.

    • reducing reuse between neighboring cells

  • Several presentations have takled this problem:

    • adaptation of this CCA (dynamic sensitivity control)

    • adaptation of transmit power

  • In this presentation, we run a set of simulations to confirm/infirm first insights regarding these schemes

    • MAC system simulator with simple PHY abstraction

Imad Jamil (Orange)


Co channel interference cci from neighboring cells
co-channel interference (CCI) from neighboring cells - CCA adaptation) and transmit power control (TPC)

UsefulRx power

  • In scenarios where the useful receive power is always sufficiently higher than interference, reuse between neighboring cells is possible

    • but currently prevented by CCA threshold

Min SINR to receiveMCSx

(sensitivity)

CCI

CCI

Co-Channel interference (CCI)

CCA

Noise floor

AP

Simultaneous transmission

STA

STA

Interfering AP

Imad Jamil (Orange)


How to enable reuse
How to enable reuse - CCA adaptation) and transmit power control (TPC)

UsefulRx Power

1: Transmit power control

2: CCA control (DSC)

Min SINR to receiveMCSx

(sensitivity)

CCI

Co-Channel interference (CCI)

Co-Channel interference (CCI)

Simultaneous transmission

Simultaneous transmission

STA

STA

AP

AP

UsefulRx Power

STA

STA

Min SINR to receiveMCSx

(sensitivity)

CCA

CCI

CCI

CCA

Interfering AP

Interfering AP

Noise floor

Noise floor

Imad Jamil (Orange)


Simulate simple algorithms
Simulate simple algorithms - CCA adaptation) and transmit power control (TPC)

  • DSC (CCA control):

    • each STA adjust CCA to CCA = UsefulRx Power – Margin

  • TP control:

    • eachreceiverrequeststransmitter to adjustTP sothatitreceives the UsefulRx Power at Margin dB aboveclassical CCA (-82dBm)

  • In each case, the margin has a strongrelationshipwith the min SINR experienced by STAs

    • we are not discussinganyprotocol in here

  • tune CCA level

    AP

    tune CCA level (and receiver sensitivity)

    STA

    tune TP

    AP

    STA

    Imad Jamil (Orange)


    Simulation scenario
    Simulation scenario - CCA adaptation) and transmit power control (TPC)

    BSS

    Cluster

    3

    Imad Jamil (Orange)


    Simulation scenario - CCA adaptation) and transmit power control (TPC)

    Close to scenario 3

    - First tier only (7 BSSs), 8 STAs per BSS, Single channel for reuse 3

    Tx : 15 dBm

    [21 m]

    [7 m]

    Tx :15 dBm

    Imad Jamil (Orange)


    Simulation scenario1
    Simulation scenario - CCA adaptation) and transmit power control (TPC)

    • PHY

    • IEEE 802.11n

    • Path Loss: ITU UMi (23.3+36.7log10(d)+ 21log10(2400/900MHz))

    • Band: 5 Ghz

    • Channel: 20 MHz

    • Tx power: 15 dBm

    • Traffic

    • Full buffer UDP traffic

    • DL (AP->STA)

    • UL (STA->AP)

    • Simple metric

    • Aggregate throughput

    • Fixed MCS or rate adaptation AARF

    Parameters

    Imad Jamil (Orange)


    Fixed mcs7 dsc and tpc
    Fixed MCS7 – DSC and TPC - CCA adaptation) and transmit power control (TPC)

    Different margin (10-15-20-25-30-35-40-50)

    No DSC

    No TPC

    DSC

    TPC

    Imad Jamil (Orange)


    Rate control dsc and tpc
    Rate control – DSC and TPC - CCA adaptation) and transmit power control (TPC)

    • Different set of MCSs for rate control:

    • all MCSs, MCS 2-7, MCS 3-7, MCS 4-7, MCS 5-7, MCS 6-7

    No DSC

    No TPC

    DSC

    TPC

    Imad Jamil (Orange)


    First observations
    First observations - CCA adaptation) and transmit power control (TPC)

    • CCA and TPC are strongly increasing reuse and aggregate throughput

      • Margin optimization

    • Weak rate control algorithms make aggregate throughput collapse

    • The margin gives an indication on min SINR

      • if used for suppression of MCS usage below this min SINR

      • it leads to strong improvement of rate control efficiency and to aggregate throughput gains

    Imad Jamil (Orange)


    Impact of legacy devices
    Impact of legacy devices - CCA adaptation) and transmit power control (TPC)

    • mix of legacy (not implementing DSC or TPC) and DSC/TPC-capable STAs (implementing DSC or TPC)

      • 1 legacy STA per BSS

    Imad Jamil (Orange)


    Rate control dsc mix with legacy devices
    Rate control – DSC– mix with legacy devices - CCA adaptation) and transmit power control (TPC)

    All DSC-capable STAs

    DSC-capable STAs + 7 legacy STAs

    No DSC

    DSC

    No DSC

    DSC

    Imad Jamil (Orange)


    Rate control tpc mix with legacy devices
    Rate control - TPC – mix with legacy devices - CCA adaptation) and transmit power control (TPC)

    All TPC-capable STAs

    TPC-capable STAs + 7 legacy STAs

    No TPC

    TPC

    No TPC

    TPC

    Imad Jamil (Orange)


    First observations for mix with legacy
    First observations for mix with legacy - CCA adaptation) and transmit power control (TPC)

    • As expected, the impact of legacydevices on aggregatethroughputiswaystrongerwith TPC thanwith DSC

      • with TPC, thoselegacy are disablinganyreusepossibility

      • with TPC, thoselegacy are alsodisturbing the relationshipbetween the margin and the min SINR and cancels MCS suppression benefits in rate control algorithms

    Imad Jamil (Orange)


    Conclusion next steps
    Conclusion/next steps - CCA adaptation) and transmit power control (TPC)

    • Preliminaryresultswith MAC system simulator are showing

      • very good per user throughput gains both for TPC and DSC

      • additionalbenefit of the « margin » for rate adaptation improvementthroughdesabling the use of lowMCSs

      • strong impact of legacydevices on TPC reuseefficiency

    • Nextsteps

      • simulator evolution (calibrated)

      • different scenarios

      • analysis of potentialstarvation of legacydevices in case of DSC

      • analysis of RTS/CTS impact

    Imad Jamil (Orange)


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