written 5.8 years ago by
teamques10
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• modified 5.8 years ago |
(1) Blockage:
a) Set up blockage: To a mobile several calls can inter-collide simultaneously. If this no exceeds 10 then mobile is said to be blocked and this blockage is called as setup channel blockage.
b) Voice channel (Call) blockage: Simultaneously when many calls come in , calls are rejected because there are no voice channels available and this blockage is called as voice channel blockage.
(2) Call drops: Defined as the calls that are dropped because of factors after the voice channel is allocated to a mobile because of weak signals. It depends on hand off traffic model and signal coverage.
(3) Voice quality: It is the ratio of signal to distortion (SINAD), usually expressed in dB and quoted alongside the receiver RF sensitivity, to give a quantitative evaluation of the receiver sensitivity.
(4) Word error rate: WER is a common metric of the performance of a speech recognition or machine translation system and given as
WER= (S+D+I)/N ,Where, S= ni of substitutes
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