 reported as well in this scheme). Detailed descriptions of the various CQI reporting options available in LTE can be found in [22]. The impact of CQI feedback reduction on the performance of fully dynamic PS with VoIP traffic is analyzed in [23]. Due to the nature of the VoIP traffic, the realized time and frequency domain scheduling gains are lower than, for example, the best effort (BE) traffic. This implies that VoIP traffic is rather robust against reduced CQI feedback. This is also verified by the results presented in [23]-according to the results, 84% reduction in CQI overhead implied only 7% loss in capacity compared to the case, where full CQI (one CQI per PRB) was used. On the other hand, this compressed CQI over- head still corresponds to a 4 kbps UL channel bit rate, which might be too much considering the limited capacity of PUCCH. As the number of supported users in LTE with VoIP traffic is high, it may necessitate the usage of wideband CQI in order to keep the overhead from CQI feedback at a reasonable level. This would mean the lowest possible UL signal- ing overhead from CQI feedback at the cost of reduced capacity, as all frequency domain scheduling gains will be lost. In order to keep the capacity reduction at a minimum, the impact of lost frequency domain scheduling gains to the perfor- mance should be compensated with more efficient utilization of frequency diversity. Means to achieve this are described in Section 10.6.2.3. 10.5.2 Co-Channel Interference and Noise Limitations for LTE UL When the frequency re-use factor is set to one (1) for LTE, co-channel interference is generated in the network, degrading the UL performance of LTE significantly. In order to mitigate the impact of co-channel interference in LTE UL, interference aware scheduling [24,26], described in Section 10.6.2.5, could be used. © 2009 by Taylor & Francis Group, LLC Radio Access Network VolP Optimization Further, in extreme noise limited scenarios such as macro-cell scenario case 3 [27], LTE UL may suffer from UL coverage