The C/I calculation in UL is calculated so that C(j,k) is the received power from the UEj,k at the j-th BS.
(Eq. 54)
where Pt is the transmit power of the UE in dBm (see UL Power control below) and effective_pathloss is defined as in Section 7.6.1..
The total interference to a UL cellular system is derived from
(Eq. 55)
where
- Iinter is the interference coming from UEs of the same system but from adjacent cells, i.e. the inter-system interference from other cells. Since a fully orthogonal system is assumed, only UEs which transmit in the same frequency subcarriers will introduce interference to each other, hence only UEs in other cells with the same k index are considered;
- Iext(j,k) is the interference from external interfering system(s) in adjacent channel;
- N is the noise floor.
(Eq. 56)
(Eq. 57)
Iext(j,k) is the interference to the the victim BSj from N interfering link transmitters (ILT), where
(Eq. 58)
for each of the victim BSj’s frequency where the UL information is received. The ILT can be any generic systems or a BS/UEs of a cellular system.
(Eq. 59)
at the victim system frequency. Where NRB is the number of RBs (i.e. subcarriers) requested per UE, and M is the maximum number of RBs per BS.
(Eq. 60)
where NoiseFigureBS is the noise figure of a BS.