By J. C. Bic, E. Bonek
An in-depth evaluation of the common cellular Telecommunication method (UMTS) for telecommunications teachers, researchers, and communications specialists.
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Additional info for Advances in UMTS Technology
The measurement course and experimental conditions were the same as those in Figure 15. Fast TPC was used for the reverse and forwar links. The number of maximum Rake fingers for the BS and MS was 4. 8. In the measurement course, it was observed that the instantaneous transmit power is controlled around the standard transmit power without dispersing to the maximum output during the course. 3 dB compared to a one cell-site connection. This improvement is small compared to that in the reverse link because the increase in interference due to transmissions from two BSS diminished the diversity effect.
An increase in the difference between the Advances in UMTS technology 37 transmit powers of the BSS causes a reduction in site diversity gain and an increase in the interference to other users. To overcome this problem, several schemes that compensate for the BS transmit power were proposed [28, 29]. I the method proposed in , each BS controls its instantaneous transmit pow by using a forgetting factor so that the difference between instantaneous transmit power and the BS-specific reference transmit power calculated by averaging the instantaneous values does not become large.
2 Forward link When fast TPC is applied in the forward link inter-cell site diversity mode, each BS independently follows the TPC command bit sent from the MS via the reverse link. Therefore, the transmit power of each BS differs when a TPC command bit error occurs in the reverse link. An increase in the difference between the Advances in UMTS technology 37 transmit powers of the BSS causes a reduction in site diversity gain and an increase in the interference to other users. To overcome this problem, several schemes that compensate for the BS transmit power were proposed [28, 29].