Sichuan Unicom Cdma2000 1x Packet Networks, Network Design,

CDMA(Code Division Multiple Access) mobile telecommunication system is based on Code Division Multiple Access technique in expand frequence. Assigning serial different address code to different subscribers, useful signal is taken out of the same time slot and frequence,and is transmitted with one share channel.At received end,system makes use of completed address code from sending end to do correlative check and take out useful subscriber signal.The other address code signals are treated as broadband disturbing signal which is removed.In radio environment of existing variable disturbtion and muti-way declining ,expand frequence signal's broadband characteristics can improve system performance obviously.CDMA mobile telecommunication system has some better characteristics,such as anti-disturbing,anti-way declining,secrecy,capacity,utilizing rate of frequence resource and so on,than other mobile telecommunication system.CDMA2000 1X packet network's system structure is mainly according as 3GPP2 P.S0001-A V3.0.0 Wireless IP Network Standard,July 2001 and adopting Packet Data Service Node (PDSN)concept.CDMA2000 1X packet data service is completely based on IP technique.When subscribers use packet data service,packet network offers a channel to connect IP network to mobile terminal.On this way,CDMA2000 1X packet network can offer internet accessing,VPN(virtual private network) special network accessing service and so on.As 3G(The third ganeration) telecommunication technique come, packet network offers many expecting service ,such as image flowing medium,video meeting,interactive game service, etc.This engineering design helps to construct CDMA2000 1X Packet Network of SiChuan Unicom. CDMA2000 1X Packet Network design is based upon using to have studied reference model of CDMA2000 1X packet network,traffic model of packet data service, designing priciple of data telecommunication network, mobile IP technique and so on.It can guide engineering implementing directly,and has important utility value.It will enhance market competition of SiChuan Unicom and will establish a SiChuan Unicom's milestone on developing CDMA service and smoothly upgrading to 3G in...