peakers' voice tone to the language used in the communication. Traditionally, mean opinion score (MOS) surveys or standardized metrics have been used to measure voice quality, with the latter being more convenient in most cases. The Perceptual Evaluation of Speech Quality (PESQ, ITU-T P.862) algorithm has been used for narrowband telephony since 2000. However, this methodology was designed for narrowband codecs, limited to 3.4 kHz, and is not well suited for evaluating the quality of new wideband codec used in VoLTE and OTT VoIP applications, which capture a larger range of audio frequencies. A new algorithm, Perceptual Objective Listening Quality Assessment (POLQA, or ITU-T P.863) addresses PESQ shortcomings and provides a new narrowband, wideband and super wideband (SWB) that can go up to 14 kHz audio frequency [6]. Mouth to ear delay is a measure of the delay in the speech from the speaker to the listener. It depends on several factors including the size of the buffers to compensate packet jitter and combined delays in radio and transport interfaces. POLQA scores are relatively independent LTE Small Cell Optimization AMR-NB AMR-WB 80-3700 Hz 50-7000 Hz 0.05 0.1 7 kHz Figure 16.25 Audio bandwidth of narrowband and wideband AMR of the average voice delay, but according to ITU-T G.114 recommendations, delays lower than 200 ms are needed for excellent quality, 200-300 ms for 'satisfied users' and higher than 400 ms denote a high probability of dissatisfied users [7]. Throughput is the one-way average bit rate measured at IP level during a 2-minute call using a predefined speech sample which combines periods of voice activity and silence. This speech pattern provides approximately 25% of talking time, 25% of listening time and 50% of time where both parties are in silence. Additionally, for VoLTE services PDCP layer may implement robust header compression (ROHC) algorithms which may reduce the actual throughput in the radio interface for VoLTE further. Current consumption is the average current in milliamperes cons