21. February 2018 at 13:56 #9394ahmetemirParticipant
I’m new on Vienna Downlik System Levem Level Simulator 1.9 Q2-2016. I want to modify prop fair scheduling algorithm to implement generalized proportinal fair scheduling algorithm. First af all I want to understand propFairSunScheduler.m of original Vienna 1.9 SL project. I read LTE-A System Level Documentation v1.9 Q2-2016 documentation. According to this documentation , proportional fair scheduler has been written , as in paper ”Reduced-Complexity Proportional Fair Scheduling for OFDMA Systems” by Z. Sun, C. Yin, and G. Yue ( link:http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4064107).
In this paper proposed algorithm has been given on secton IV proposed PF Scheduling Algortihm For OFDMA Systems by Step1 ,Step 2 and Step 3 equations. In propFairSunScheduler.m I saw below code on PF_Scheduler function :
metric(res(1:sum(RB_set)),:) = cleaned_c_log_matrix(res(1:sum(RB_set)),:)+UE_avgd_pre_metric_mat(res(1:sum(RB_set)),:);
Is this code calculate PF metric? I couldn’t find any correlation between this code and step1 on this document at this link:http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4064107 . Where is the code part of Step1 ,Step2 and Step3 on original Vienna SL Simulator1.9.
Could you give me advices?
Best Regards…25. February 2018 at 13:30 #9523ahmetemirParticipant
While I’m trying to solve , in below code:
metric(res(1:sum(RB_set)),:) = cleaned_c_log_matrix(res(1:sum(RB_set)),:)+UE_avgd_pre_metric_mat(res(1:sum(RB_set)),:);`
I realized that UE_ avd_pre_metric_ mat is calculated as:
UE_avgd_pre_metric = -alpha_temp*log10(max(avgd_UE_throughputs+sum(RB_UEs.*c,1)*12*7,eps));
UE_avgd_pre_metric_mat = UE_avgd_pre_metric(ones(1,N_RB),:);
Also I’m thinking UE_avgd_pre_metric is similar as Equation(11) in the document (link: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4064107) İs it true?
But I couldn’t understand to calculate PF metric why cleaned_c_log_matrix is added to UE_avgd_pre_metric ? What are cleaned_c_log_matrix and UE_avgd_pre_metric exactly?
Would you explain me please? I couldn’t understand this expression from code? In order to modify prop fair scheduling I have to understand Vienna1.9 codes in detail .
Best wishes..9. March 2018 at 17:29 #9842Fjolla AdemajMember
Step 1 is represented by parameter metric, step 2 by maximizing the metric, and step 3 is represented by the loop over the number of resource blocks.
Since the implementation was done long time ago, by another member of our team, hard to say one-to-one which parameter presents which part of the equation. To give you an idea, the parameter c represents the rate r, nominator of equation (16), while avgd_UE_throughputs represents the term (t_c – 1)*T_k.
In order to speed up the calculation, a lot of precalculation is done and vector/matrix notation is used.
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