| A WWAN system based on GPRS/SMS/CSD is discussed in this paper. It discusses the characteristic of each level in OSI model from the point of WWAN first , then analyses clearly the primary technologies used in GPRS/SMS/CSD and a topology structure model of the WWAN based on GPRS/SMS/CSD is presented. It also deeply discusses the integrate technology of GPRS/SMS/CSD in a example of Fujian Environmental automatization system, at the same time a network model of WWAN Based on GPRS/SMS/CSD is brought forward. Last, there are the module programmers of the system. |
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