name: FER
full_form: Frame Error Ratio
context: assignment by ITU-T. The code points 128 â 255 are reserved for network specific assignment. The code point is just an indicator to select an AAL type 2 path and the exact QoS of the AAL type 2 path for the code point is implementation specific. However all the QoSs indicated by the code points have to be within the boundaries of stringent class, tolerant class, or stringent bi-level class as defined in I.356[1]. Expected difference of QoS for the QoS optimization use is mainly CTD (Cell transfer delay) and CDV (Cell delay variation) within the boundary of stringent class as defined in I.356[1]. The code points reserved for network specific assignment may be used to indicate different path types within the boundary of stringent class. Looser CTD and CDV must require thinner virtual bandwidth which may be applied for tolerant real time traffic. The expected difference of QoS for user traffic may be originated by UMTS QoS classes (conversational, streaming, interactive, and background)
description: The Frame Error Ratio (FER) is a metric used to assess the performance of a communication system by measuring the ratio of frames received with errors to the total number of frames transmitted. In the context of 3GPP TS 25.848, FER is used to evaluate the impact of non-ideal channel estimation on the system's performance under various conditions such as different modulation schemes (QPSK and 16QAM), vehicle speeds (3kmph and 120kmph), and channel models (1-path Rayleigh).
explanation: FER is classified as a Measurement because it quantifies the error rate in frame transmission, which is a key performance indicator in telecommunications. The provided text emphasizes its use in evaluating system performance under different scenarios.
section_title: A.2.2	Effect of non-ideal channel estimation:
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