Editing Mobile QoS (section)

==Cellular GoS==
In general, [[grade of service]] (GoS) is measured by looking at traffic carried, traffic offered and calculating the traffic blocked and lost.<ref name=Miao/> The proportion of lost calls is the measure of GoS. For cellular circuit groups an acceptable GoS is 0.02. This means that two users of the circuit group out of a hundred will encounter a call refusal during the busy hour at the end of the planning period. The grade of service standard is thus the acceptable level of traffic that the network can lose. GoS is calculated from the [[Erlang unit#Erlang B formula|Erlang-B formula]], as a function of the number of channels required for the offered traffic intensity.