n, it seem reasonable to assume that the in-band blocking specification for UTRA should be -40 dBm (considering that 33 dBm terminals will exist), and the interfering (blocking) test signal should be an HPSK carrier. A 6 dB degradation in sensitivity under the blocking condition should be allowed [5]. 5.5.9 Transmit Intermodulation for the UE User equipment(s) transmitting in close vicinity of each other can produce Intermodula- tion (IMD) products, which can fall into the UE, or BS receive band as an unwanted interfering signal. The transmit intermodulation performance indicates the ability of transmitter to inhibit the generation of signals in its non-linear elements caused by pres- ence of the wanted signal and an interfering signal reaching the transmitter via the an- tenna. We define the UE intermodulation attenuation by the ratio of the output power of the wanted signal to the output power of the intermodulation product when an interfering CW signal gets added at a level below the wanted signal. We measure, both the wanted signal power and the IMD product power with a filter that has a Root-Raised Cosine (RRC) filter response with roll-off of 0.22 and a bandwidth equal to the chip rate. Such test procedure is identical to the ALCR requirement with the exception of the interfer- ing signal. Thus, when performing the aforementioned test, we cannot separate the ACLR impact due to the wanted signal, which would fall into the 1st and 2nd adjacent channel from the IMD product as a result of the interfering signal. Consequently, the IMD cannot be specified to be the same value as the ALCR. It has to be a lower value (e.g. 2 dB) to account for the worst case ALCR contribution [5]. The UMTS Network and Radio Access Technology CONCLUSIONS In this chapter we outlined the UTRA transmission system characteristics and also pro- vided reference examples quantifying some of the recommended parameters or thresh- old values. The examples use the principles described in Chapter 2 through simulation techniques carried out duri