7/14/2023 0 Comments Rsrp dbmThe output power used in the UE is dictated by the eNB. If you have used the LTE Link Monitor tool, the RSRP determines the visualized signal strength in the right top corner and it is plotted in the chart view. The RSRP is used when doing cell selection/reselection and handover. The output power from the eNB is constant, so the RSRP directly tells us something about the signal quality. It is the received power of a specific reference signal that is sent from the eNB to the UE. The standard way of measuring received power in the LTE world is by using reference signal received power (RSRP). Some elaboration on the parameters we sampled: Each symbol in these modulations represents different number of bits. More bits per symbol means higher bitrate/throughput and higher energy efficiency. LTE-M uses QPSK or 16QAM in both UL and DL depending on signal quality, while NB-IoT uses BPSK or QPSK in UL, depending on signal quality, and only QPSK in DL. The bigger bandwidth of LTE-M results in higher throughput, while the smaller bandwidth of NB-IoT should result in better signal quality and range. LTE-M has 1.4 MHz, while NB-IoT has 200 kHz. Firstly, the on-air bandwidth is different. There are a couple of relevant differences between LTE-M and NB-IoT that are worth mentioning before continuing. New to LTE terminology? Check out the bottom of the page. ![]() To obtain more valuable characterizations we went out in the Norwegian wilderness to field-test how distance/signal quality affects the behavior of LTE-M and NB-IoT. Unfortunately, many of the characterizations list ideal numbers, which probably isn't too applicable to your real-world product. There are many sources of information on the web trying to characterize the new low power cellular technologies LTE-M (Cat-M1) and NB-IoT (Cat-NB1). This blog post complements the video with the same title, see this.
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