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The C/I calculation in DL is calculated as

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body$C/I=\frac{C(j,k)}{I(j,k)}$
    q. 46)

where C(j,k) is the received power at the k-th user from the serving BS, i.e., the j-th BS

                                          

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body$C(j,k)=P_{BS}^{UE}\times effective\_pathloss(B{{S}_{j}},U{{E}_{j,k}})$
 (Eq. 47)

and where  is the power of resource block and effective_pathloss is defined as in Section ‎7.6.1.

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I(j,k) is the sum of the interference power


                                          

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body$I(j,k)={{I}_{\text{inter}}}(j,k)+{{I}_{ext}}(j,k)+N$
    (Eq. 48)

where


  • Iinter (j,k) is the adjacent cell interference (i.e. from the same victim system, i.e. denoted inter-system interference;
  • Iext(j,k) is the interference from external interfering system(s) in adjacent channel, i.e interference power into this resource block including ACIR;
  • N is the noise floor.

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,          Image Removed                        (Eq. 49)

body${{I}_{\operatorname{int}er}}(j,k)=\sum\limits_{l=1,l\ne j}^{{{N}_{cell}}}{P_{BS}^{UE}\times effective\_pathloss(B{{S}_{l}},U{{E}_{j,k}})}$
      (Eq. 49)

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body${{I}_{\text{ext}}}(j,k)=\sum\limits_{m=1}^{N}{iRS{{S}_{unwanted}}(IL{{T}_{m}},U{{E}_{j,k}})\times iRS{{S}_{blocking}}}(IL{{T}_{m}},U{{E}_{j,k}})$
      (Eq. 50)

Iext(j,k) is the interference to the the victim UEj,k from N interfering link transmitters (ILT). Note that the ACIR (Adjacent Channel Interference Ratio) is implicitly taken into account when both unwanted and blocking mechanism are summed in the computation. The unwanted and blocking are defined as follow

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body$iRS{{S}_{unwanted}}(IL{{T}_{m}},U{{E}_{j,k}})=iRS{{S}_{unwanted}}(\text{over the size of the UE resource blocks})$
       (Eq. 51)

for each of the victim UEj,k’s frequency where the DL information is received. The ILT can be any generic systems or a BS/UEs of a cellular system.

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