mohammed83
2015-08-14, 12:22 AM
Hello all,
I have TDD system of bandwidth 20MHz with DL-to-UL Conf 0 ==> DSUUUSDUUU and Special subframe format 10:2:2 so the DL/UL Ratio is 34.28% / 60%
Now I have to plan the AMR 12.2 kbps using the specific codecs rate becomes 288kbps. Cell edge user is using on DL at least 0-QPSK MCS and in UL 5-QPSK MCS.
Now the prblem I am getting is why NSN are calculating RBs differentky from Huawei since we have the same standard and same TBS tables!!!
DL
NSN formula for 0-QPSK : Nrb =Fx*2* E[(288/0.3428)*2/100] = 32 ===> E[x] = integer part of x; Fx=x-QPSK factor => F0=0-QPSK factor = 1 (I guess it's bit/symbol)
Huawei value (I don't have the formula) ==> Nrb= 13
UL 5-QPSK
NSN ==> Nrb = F5*2* (288/0.6)*2/100 = (5/8)*2*(480*2/100)=6
Huawei ==> Nrb = 5
WHY this difference if you have any idea help me please?
P.S : Ihave a problem with Ressource Block Group Size values (0;1;2;3 or 4), meaning and impact!
I have TDD system of bandwidth 20MHz with DL-to-UL Conf 0 ==> DSUUUSDUUU and Special subframe format 10:2:2 so the DL/UL Ratio is 34.28% / 60%
Now I have to plan the AMR 12.2 kbps using the specific codecs rate becomes 288kbps. Cell edge user is using on DL at least 0-QPSK MCS and in UL 5-QPSK MCS.
Now the prblem I am getting is why NSN are calculating RBs differentky from Huawei since we have the same standard and same TBS tables!!!
DL
NSN formula for 0-QPSK : Nrb =Fx*2* E[(288/0.3428)*2/100] = 32 ===> E[x] = integer part of x; Fx=x-QPSK factor => F0=0-QPSK factor = 1 (I guess it's bit/symbol)
Huawei value (I don't have the formula) ==> Nrb= 13
UL 5-QPSK
NSN ==> Nrb = F5*2* (288/0.6)*2/100 = (5/8)*2*(480*2/100)=6
Huawei ==> Nrb = 5
WHY this difference if you have any idea help me please?
P.S : Ihave a problem with Ressource Block Group Size values (0;1;2;3 or 4), meaning and impact!