????OTA(Over-the-Air Technology)????????????????????????(GSM??CDMA)????н???SIM?????????y??????????????????н????????WAP??GPRS??CDMA1X?????????????OTA???????????????????????????????????????????????????????????????????ü????????????????????????????????????????????????????????????????????????????λ?÷?????????н????????OTA????????????????????????м???????????????????e???????????????????????OTA?????????????У???????????????????????????????

????2.5G???????2G??3G?????????????????GPRS.??2G??????????????????? .???????GSM??????????????????????????????

????3G??(third generation)?????????????????????????????????????? ???????????(ITU)?????IMT-2000(International Mobile Telecom-munication)???????2Mbp/s???????????????????????CDMA??????????WCDMA(?????)??CDMA2000(??)??TD-SCDMA(??)??

????GSM??(Global system for Mobile communications)????????????2G?????????????????????9.6kb/s. GPRS??(General Packet Radio Service)??÷??????????????????GSM??????????齻????????2.5G??????????????????????????171.2kb/s . WAP??(Wireless Application Protocol)???????Э?顣????????????????????Э???????????????綽??С????????????豸??WAP??????????????????????????GSM??GPRS??CDMA???

????J2ME?? Java 2 Platform micro Edition 1999??6?μ?????JAVA2?????????????????????????????????????JAVA?????л?????????????????????(PDA?????)??????????С?

????CLDC??Connected Limited Device Configuration ?????????豸???á?????????????????????????JVM J2ME??????KVM MIDP??Mobile Information Devices Profile ???????豸????J2ME????????MIDP??KJava ???????????????MIDP. J2ME?????FAQ

????1. J2ME??Java 2 Platform micro Edition????д??1999??6?μ?????JAVA2?????????????????????????????????????JAVA?????л?????????????????????(PDA?????)??????????С?

????2. MIDP?????????豸????J2ME????????MIDP??KJava ???????????????MIDP.

????3. CLDC???????????豸???á?????????????????????????JVM J2ME??????KVM.

????4. J2SE SDK?????J2ME??JDK ???????1.3?汾??

????5. Palm??Palm??Palm???????????????????????????*????????????????????????Palm M505 6. POSE ??Palm*??????PC??????????

??????????wireless????????

????????1G/2G/2.5G/3G 1G(first generation)??????????????????????????????????????????

????2G(second generation)????????????????????????GSM.??????????? ?似????????

????2.5G?????2G??3G?????????????????GPRS.??2G??????????????????? .???????GSM??????????????????????????????

????3G(third generation)?????????????????????????????????????? ???????????(ITU)?????IMT-2000(International Mobile Telecom- munication)???????2Mbp/s???????????????????????CDMA??????????WCDMA(?????)??CDMA2000(??)??TD-SCDMA(??)??

????????GSM??????????(Global system for Mobile communications)???????д??2G?????????????????????9.6kb/s??