mohammed83
2015-09-11, 08:50 AM
dear all,
I am configuring my LTE TDD project on Atoll and I am getting some issues understanding the way Atoll is calculating the number of ressource elements:
I am using 20MHz channel with 100 RB and normal CP with frame config 0 DSUUU DSUUU and special subframe config 7 => 10 DwPTS 2 GP 2 UpPTS; 2Tx2Rx Antenna system
So normally with 2Tx2Rx we should get 16 RE for RS by PRB on a subframe and with frame config 0 we have DL/UL Ratio is 0.342857 so #RE (DL) = 1200*14*10*0.342857=57600 and I found this value correct for Atoll (by right clic on Transmitters=>Cell details);
the problem is for #RE(RS) calculation : normally the RS percentage on DL per PRB is 16 (number of RS) / 12*14 = 9.52% so #RE (RS DL) = 57600 * 0.0952 = 5486 or something near but in Atoll it is using 4.86% of RS on DL so Atoll is getting 57600 * 0.0486 = 2800 RE for RS on DL!!! Why Atoll is assuming 8 RS per PRB per Subframe while it should assume 16 and I trully configured 2Tx2Rx Antenna ports in Parameters=>Network Prameters=>Station Template!!
If anyone who has an idea please I need your help on how to change the "Cell Details" values or calculation method???
Hope getting some answers, many thanx! :)
I am configuring my LTE TDD project on Atoll and I am getting some issues understanding the way Atoll is calculating the number of ressource elements:
I am using 20MHz channel with 100 RB and normal CP with frame config 0 DSUUU DSUUU and special subframe config 7 => 10 DwPTS 2 GP 2 UpPTS; 2Tx2Rx Antenna system
So normally with 2Tx2Rx we should get 16 RE for RS by PRB on a subframe and with frame config 0 we have DL/UL Ratio is 0.342857 so #RE (DL) = 1200*14*10*0.342857=57600 and I found this value correct for Atoll (by right clic on Transmitters=>Cell details);
the problem is for #RE(RS) calculation : normally the RS percentage on DL per PRB is 16 (number of RS) / 12*14 = 9.52% so #RE (RS DL) = 57600 * 0.0952 = 5486 or something near but in Atoll it is using 4.86% of RS on DL so Atoll is getting 57600 * 0.0486 = 2800 RE for RS on DL!!! Why Atoll is assuming 8 RS per PRB per Subframe while it should assume 16 and I trully configured 2Tx2Rx Antenna ports in Parameters=>Network Prameters=>Station Template!!
If anyone who has an idea please I need your help on how to change the "Cell Details" values or calculation method???
Hope getting some answers, many thanx! :)