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  • inaccuracies in the C/I estimates;
  • transmit power control signaling errors;
  • delay in the transmit power control loop.

 


Links level simulations take these errors into account and reflect their impacts on the link quality figures in the look up tables to be input to the power control module of SEAMCAT.  Therefore, we assume a simple C/I based fast closed-loop TPC of traffic channels for uplink in the following.

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The local-mean Signal-to-interference power ratio in the uplink, (C/I)UL, is calculated by multiplying the received signal power S by the processing gain G, and dividing the result by the total interference power Itotal

                                                         

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Mathinline
body${{\left( \frac{C}{I} \right)}_{UL}}=\frac{G\cdot \text{S}}{{{I}_{total}}}$
        (Eq. 43)

with

                                                                                                                                                                                                                                                               

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Mathinline
body${{I}_{total}}=(1-\beta )\cdot {{I}_{\operatorname{int}ra}}+{{I}_{\operatorname{int}er}}+{{I}_{out}}+{{N}_{0}}$
   (Eq. 44)

Iintra is the intra-cell interference power, i.e. the interference generated by those mobile stations served by the same base station as the considered mobile station. Iinter is the inter-cell interference power from other radio cells. Iout is the interference power coming from the interfering system. N0 is thermal noise (as well as spurious interference) contained in the receiver bandwidth, W, and b is an interference reduction factor due to the use of interference mitigation signal processing techniques in the uplink, e.g. Multi User Detection. No such interference mitigation technique is assumed in these considerations, therefore b = 0.

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