Enhancing Area Throughput with Fractional Backoff Procedure in IEEE 802.11-16-0589-00-00ax
Explore how a fractional backoff procedure, integrated with dynamic Clear Channel Assessment (CCA), optimizes area throughput in IEEE 802.11-16-0589-00-00ax standard. By adjusting backoff rates based on contributions to throughput, this approach addresses channel status variations and maximizes spatial reuse. Learn about the steps involved, such as RSSI detection, SINR estimation, and calculating area throughput, to improve network efficiency and performance.
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May 2016 doc.: IEEE 802.11-16-0589-00-00ax Fractional-Backoff Procedure and Dynamic CCA Date: 2016-05-12 Authors: Name Affiliation Address Phone Email Bo Li libo.npu@nwpu.edu.cn Mao Yang yangmao@nwpu.edu.cn Zhongjiang Yan zhjyan@nwpu.edu.cn Xiaoya Zuo zuoxy@nwpu.edu.cn Bo Yang yangboo@mail.nwpu.edu.cn Northwestern Polytechnical University 127 West Youyi Road, Xi an Shaanxi,710072, P.R.China +86-18192187626 Submission Slide 1 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Rethink the Current Backoff Procedure In the current backoff procedure, the per-slot decreased value of backoff counter is bivariate, either 1 or 0. Per-slot Decreased Value 1 0 Channel Status idle busy Action backoff continue backoff suspend The throughput of bivariate backoff is deeply affected by the CCA level. Higher CCA level: collision increase Lower CCA level: spatial reuse suppressed Therefore, to improve area throughput, the backoff procedure and the CCA method needs to be jointly considered. Submission Slide 2 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Motivation The station who offers more contributions to the area throughput should adopt faster backoff. The station who offers less contributions to the area throughput should adopt slower backoff. The fractional-backoff procedure needs to be introduced. To be consistent with the precise fractional-backoff procedure, CCA level needs to extend from one fixed point to a range [- , CCAth]. Submission Slide 3 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Fractional-Backoff Procedure Step 1: During every time slot, the sender S detects the RSSI (dB). If RSSI > CCAth, the backoff procedure suspends. If RSSI < CCAth, execute the fractional-backoff procedure, goto Step 2. Step 2: S estimates the SINR (dB) at the receiver D. = 0 Pr SINR RSSI e where Pr0 (dB) indicates the receive power of the CTS or ACK during the last transmission of S D. Submission Slide 4 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Fractional-Backoff Procedure Step 3: S determines transmitting rate R based on the RATE-SINR mapping. Then, S calculates the its area throughput. = area / R R S , s d where Ss,d is the area covered by S or D. D OBSS S Submission Slide 5 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Fractional-Backoff Procedure Step 4: S determines the decreased value of the current time slot. = 0 area : : BO BO R R MAX where Rarea is the area throughput contributed by S. R0 is the equivalent maximum area throughput where S overlaps D. BOMAX is the maximum decreased value, e.g. 2.0. D OBSS S Submission Slide 6 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Fractional-Backoff Procedure Step 5: When the backoff counter is deceased to be or less than 0, S finishes the backoff period and accesses the network. Submission Slide 7 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Simulation Results 427.791 450 Parameter BSS size STA Num Value 50m*50m 5 up 5 down Full buffer video 5s -62dbm 1.0 400 350 Fractional-Backoff Procedure Network Throughput 296.351 300 250 Traffic Simulation CCAth BOMAX 247.645 177.204 200 181.961 150 109.382 108.8 Legacy Backoff Procedure 100 111.505 107.54 95.93 50 1 2 4 8 10 BSS number Submission Slide 8 Bo Li, et al. (NWPU)
May 2016 doc.: IEEE 802.11-16-0589-00-00ax Conclusion In this contribution, we rethink the backoff procedure of legacy IEEE 802.11, and analyze its performance limitation. In order to increase the area throughput, we jointly propose a fractional-backoff procedure and dynamic CCA method. Based on this procedure, the per-slot decreased value of backoff counter is determined by the contributions for the area throughput. Submission Slide 9 Bo Li, et al. (NWPU)
