in qu ish ▁( or ▁abandon ) ▁the ▁serving ▁cell ▁and ▁obtain ▁another ▁of ▁at ▁least ▁us able ▁quality . ▁That ▁is ▁to ▁say , ▁the ▁mobile ▁station ▁is ▁aware ▁that ▁the ▁radio ▁signal ▁is ▁decay ing ▁rapidly , ▁and ▁must ▁cell ▁res elect ▁rapidly , ▁before ▁communic ations ▁are ▁terminated ▁because ▁of ▁radio ▁link ▁failure . ▁When ▁the ▁mobile ▁station ▁radio - signal ▁bre aches ▁the ▁minimum ▁receive ▁level , ▁the ▁radio ▁is ▁no ▁longer ▁in ▁a ▁position ▁to ▁maintain ▁acceptable ▁communic ations ▁for ▁the ▁user , ▁and ▁the ▁radio ▁link ▁is ▁broken . ▁ ▁Radio ▁link ▁failure : ▁( C 1 ▁< ▁ 0 ). ▁Using ▁the ▁suggested ▁values , ▁this ▁would ▁be ▁satisfied ▁with ▁the ▁serving ▁cell ▁level ▁below ▁− 1 0 5   d B m . ▁Cell ▁res e lection ▁procedures ▁are ▁then ▁activ ated ▁in ▁order ▁to ▁find ▁a ▁suitable ▁radio ▁base ▁station . ▁ ▁Man - machine ▁interface ▁( MM I ) ▁ ▁Virtual ▁M MI ▁for ▁T ET RA ▁radio ▁terminal s ▁ ▁Any ▁given ▁T ET RA ▁radio ▁terminal ▁using ▁Java ▁( Java ▁ME / CL DC ) ▁based ▁technology , ▁provides ▁the ▁end ▁user ▁with ▁the ▁communication ▁rights ▁necessary ▁to ▁ful fil ▁his ▁or ▁her ▁work ▁role ▁on ▁any ▁short ▁duration ▁assignment . ▁ ▁For ▁de xter ity , ▁flex ibility , ▁and ▁evolution ▁ability , ▁the ▁public ▁transport ation ▁radio ▁engineering ▁department , ▁have ▁chosen ▁to ▁use ▁the ▁open ▁sources , ▁Java ▁language ▁specification ▁admin ister ed ▁by ▁Sun ▁and ▁the ▁associated