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Actually, they are more or less the same in protocol layer, the difference is RF physical layer, since they are in different freqency band, by the way, there are also many standard about GSM, like GSM850, GSM750, GSM450, EGSM900 and RGSM, PGSM,... for PCS, only PCS1900, also DCS1800.
We could not say which one is better, since they are ultilizing time mupltiplexing method to transmit or receive data.
E.g. EGSM900, in Hong Kong, only 3 operators, because 30MHz BW for Uplink, 30MHz BW for downlink, each operator occupy 10MHz, with 200kHz channel BW.
On the contrary, DCS1800, in Hong Kong, 6 operators, 60Mhz BW for Uplink, 60MHz BW for downlink, exactly the same as EGSM900
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