doc.: ax Submission May 2014 Slide 1 Proposed Rate Control For MAC Simulator Date: Authors:

doc.: ax Submission Context The evaluation Methodology does not specify which Rate Control Algorithm to use for the MAC simulator –This needs to be specified so that MAC Simulations results can be compared across companies May 2014 Barriac et al. (Qualcomm)Slide 2

doc.: ax Submission What kind of rate prediction should we use? Ideally: –Something simple –Easily reproducible across companies –Gives realistic results May 2014 Barriac et al. (Qualcomm)Slide 3

doc.: ax Submission Proposal We propose the following method –Select a single MCS per link –Select MCS upfront using a training phase and then fix it for the simulation time –Selected MCS should maximize goodput Details: –Run the simulation with all nodes using MCS0 for a set amout of time –For each link, log the SINRs for each MPDU These are the SINRs of packets at the node which is the intended recipient log SINRs for both detected as well as missed MPDUs. –Given this SINR information, Post process to find the MCS that would have maximized the goodput for that node. ( note good put will depend on PER curve used) –Rerun the simulation with each link using the good put maximizing MCS –This method was used for resuls in “CCA study in Residential Scneario” Note: A similar method was proposed by Nihar Jindal and Ron Porat in Improved Spatial Reuse Feasibility Part II – While 0083 Proposed good-put maximizing MCS selection for the PHY simulator, we are proposing a similar concept for the MAC Simulator. May 2014 Barriac et al. (Qualcomm)Slide 4

doc.: ax Submission Benefits of suggested Proposal More realistic than genie aided –Models steady state of dynamic rate control algorithms Simple to implement Shouldn’t bias or confuse results. –i.e. no strange quirks possible in dynamic rate control algorithms. –No “genie” aided information May 2014 Barriac et al ( Qualcomm)Slide 5

doc.: ax Submission Conclusion We suggest using the MCS selection method described in slide 5 as the Rate Control Method in the MAC Simulator. May 2014 Barriac et al. (Qualcomm)Slide 6

doc.: ax Submission Suggested Change to ax evaluation methodology Under the Section “ MAC System Simulation Description” –Add the following text at the end of the section: – MCS Selection A single MCS should be selected per link. The MCS should be selected upfront using a training phase, and then fixed for the simultion time. The MCS selection should follow this process: –Run the simulation with all nodes using MCS0 for a set amout of time –For each link, log the SINRs for each MPDU These are the SINRs of packets at the node which is the intended recipient log SINRs for both detected as well as missed MPDUs. –Given this SINR information, Post process to find the MCS that would have maximized the goodput for that link. May 2014 Barriac et al. (Qualcomm)Slide 7

doc.: ax Submission Straw Poll 1 Do you support using a fixed MCS per link in the MAC simulator? May 2014 Barriac et al. (Qualcomm)Slide 8

doc.: ax Submission Straw Poll 2 Do you support using a fixed MCS method suggested in slide 4 for the MAC Simulator? May 2014 Barriac et al. (Qualcomm)Slide 9