 UE Transmit Power Figures 16.44a, 16.44c and 16.44e use this set of drive test logs to plot constellations of PUSCH, PUCCH and SRS transmit power versus RSRP levels for a set of applications restricted to radio streaming, Skype video calling and a large file upload to a cloud server. Detailed chipset parameters are captured at a TTI time resolution for each drive test using the Accuver XCAL software suite, and postprocessed using the Accuver XCAP tool. PUSCH PUCCH - PUSCH PUCCH TX power (dBm) PUCCH PDF PUSCH PDF SRS PDF PUCCH CDF PUSCH CDF SRS CDF Figure 16.43 Example of PUCCH, PUSCH and SRS transmit power profile in the drive route for a radio streaming application. (a) Transmit power versus time; (b) transmit power versus serial frame number; (c) transmit power CDF and PDF LTE Small Cell Optimization PUSCH Total tx power PUSCH trend line PUCCH PUCCH trend line RSRP (dBm/15 kHz) RSRP (dBm/15 kHz) PUSCH Total tx power PUSCH trend line PUCCH trend line PUCCH RSRP (dBm/15 kHz) RSRP (dBm/15 kHz) PUSCH PUSCH trend line Total tx power PUCCH PUCCH trend line RSRP (dBm/15 kHz) RSRP (dBm/15 kHz) Figure 16.44 UE transmit power versus RSRP in radio streaming (top row), Skype video calling (mid row) and file upload (bottom row). (a,c,e) PUCCH, PUSCH, SRS versus RSRP clouds and approximate trend lines; (b,d,f): approximate 'UE total tx power' versus RSRP cloud and trend lines The average PUSCH transmit power increases across these three use cases. This is expected since the selection is representative of increasing uplink traffic (cf. Figure 16.42b). On the other hand, PUCCH transmit power profiles do not vary from application to application. Considering the important power fluctuations and the highly dynamic nature of uplink transmissions, we propose to define a virtual 'total' average transmit power. The 'total' transmit power is defined as the average power of all uplink physical channels over a long time interval. Introducing an 'average total' transmit power is rather subjective, but the intent is to simplify the relat